Patent Application
20190248063
A forming and cutting tool and method of use for molding composite material and trimming non-planar cut edges of molded composite material.
The need for greater fuel efficiency in vehicles has resulted in a need for lighter weight automotive bodies meeting the same safety and performance standards. To provide for lighter weight automotive bodies, lighter weight materials, such as composite materials have been used to form the body panels, reinforcement structures, and other components of the automotive body. One example of a composite material used for automotive bodies to provide for vehicle weight reduce is carbon fiber composite. To be sustainable for use in automotive manufacturing, the carbon fiber composites must be manufactured in a method which is suitable for high volume and economical production. WO 2014/182429, expressly incorporated herein by reference in its entirety for all purposes, discloses an elegant solution for forming and trimming composite materials in order to achieve the weight saving potential of carbon fiber composites and minimize scrap associated with trimming the composite material. Notwithstanding, there are still challenges faced with forming composite structures having three-dimensional, non-planar geometry (i.e., relative to a longitudinal plane and a transverse plane) from composite materials and trimming non-planar edges of the structures after being formed from the composite material.
Composite forming and cutting tools include a number of components which work together to both form composite material into a composite structure and trim the edges of the composite structure. The more components in a die press, the more maintenance is generally required to maintain the tool in working condition; the higher the cost of the tool due to purchasing all of the components and labor associated with assembling the tool; and the more complex the tool may be to use, troubleshoot, and/or repair.
During compression molding of non-planar composite structures, a composite material blank may become wrinkled, torn, or otherwise damaged. This damage can result during application of pressure when clamping the composite material blank between an upper die and a lower and/or when forming (i.e., molding) the composite material blank by deforming the composite material blank between the upper and lower die. The pressure applied during clamping and/or forming of the composite material blank prevents slipping of the composite material between the upper die and lower die, which results in wrinkling, tearing, or other damage to the composite material blank.
There is a need for a single forming and cutting tool useful for both forming a composite material blank into a formed composite material having a non-planar profile and cutting non-planar edges of the formed composite material; a simplified tool design with fewer components; and which is able to aid in preventing material wrinkling.
The present disclosure relates an article comprising: (a) an upper die having: (i) an upper pressure pad mounted to a support surface of the upper die, wherein the upper pressure pad includes an upper shearing edge located at least partially about an inner perimeter of the upper pressure pad; (ii) an upper mold mounted to the support surface of the upper die and disposed within a recess of the upper pressure pad; (b) a lower die opposing the upper die having: (i) a lower pressure pad mounted to a support surface of the lower die; (ii) a lower mold mounted to the support surface of the lower die and disposed within a recess of the lower pressure pad, wherein the lower mold includes a lower shearing edge located at least partially about an outer perimeter of the lower mold; wherein the upper die is adapted to come into contact with the lower die such that the upper pressure pad applies pressure to the lower pressure pad and the upper mold applies pressure to the lower mold to form a composite structure; and the upper die is adapted to contact the lower die so that the upper shearing edge bypasses the lower shearing edge to form a non-planar cut in a portion of the composite structure; and wherein the article is useful as a forming and cutting tool.
The upper shearing edge and the lower shearing edge may be non-planar and may be adapted to form the non-planar cut. The upper shearing edge and the lower shearing edge may have non-planar and reciprocal contours. The upper mold may include a cavity adapted to receive or be received in a core of the lower mold so as to form the composite material into a non-planar shape upon application of a die force. The cavity of the upper mold and the core of the lower mold may have non-planar and reciprocal contours. The upper pressure pad may include a lower pressure surface facing toward the lower pressure pad, the lower pressure pad may include an upper pressure surface facing toward the upper pressure pad, and the upper and lower pressure surfaces may have reciprocal shapes. The lower pressure surface may be adapted to apply a clamping force to an upper pressure surface so as to retain the composite material blank between the upper die and the lower die. The upper pressure pad may be rigidly affixed to the upper die. The lower mold may be rigidly affixed to the lower die. The lower pressure pad may be mounted to the lower die with one or more lower spring members. The upper mold may be mounted to the upper die with one or more upper spring members. The one or more lower spring members, one or more upper spring members, or both may be one or more nitrogen gas springs.
The present disclosure further relates to a method for forming and cutting a composite material blank to form a formed and cut composite structure comprising: (i) clamping the composite material blank between an upper die and a lower die; (ii) forming the composite material blank into the formed composite structure with a least a portion being non-planar; and (iii) cutting one or more edges of the formed composite structure to form one or more non-planar cut edges about at least a portion of the formed composite structure and create the formed and cut composite structure.
The article and method of the disclosure provide a forming and cutting tool useful for forming a composite material blank into a formed composite structure which may have at least a portion with non-planar profile or a profile with both non-planar and planar surfaces. The article and method of the disclosure provide for a single forming and cutting tool which may form a composite material blank into a formed composite structure and may trim the edges of the formed composite structure to result in non-planar edges or edges which have both non-planar and planar portions. The article of the disclosure combines a shearing edge into a mold and into a pressure pad of the article which may allow for reduced components and tool complexity. The article of the disclosure may incorporate nitrogen springs to optimize pressure on the composite material to help reduce or prevent wrinkling in the material during forming.
The explanations and illustrations presented herein are intended to acquaint others skilled in the art with the present teachings, its principles, and its practical application. The specific embodiments of the present teachings as set forth are not intended as being exhaustive or limiting of the present teachings. The scope of the present teachings should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated by reference for all purposes. Other combinations are also possible as will be gleaned from the following claims, which are also hereby incorporated by reference into this written description.
The disclosure relates to an article which is configured to form and cut a composite material blank into a composite structure having non-planar geometry. The article may be referred to as a forming and cutting tool. Composite material may be particularly useful, after being formed and cut into a composite structure, in serving as panel members (i.e., automotive panels); reinforcement structures; for structures useful in transportation such as automobiles, rail engines or cars, buses, trucks; and the like. Non-planar geometry may include one or more surfaces of a structure which are curved; disposed at an angle (i.e., sloping toward or away from) to one or more axes of the structure and/or one or more planes of the structure; or any combination thereof. For example, the composite structure may be a pillar assembly which may include edges (i.e., flanges) about at least a portion of a perimeter of the assembly and surfaces which are non-planar. The edges, surfaces, or both of the composite material may curve or be angled toward or away from a longitudinal axis. The edges, surfaces, or both of the composite material may curve or be angled toward or away from a transverse plane, a longitudinal plane, or both of the composite material.
The article of the invention may be particularly useful in forming and cutting a composite material blank into a desired composite structure. The composite material blank may include one or more sheets or layers of a composite material. The composite material blank may include laminates. The composite material may include a reinforcing material. The reinforcing material may be any material which is capable of improving one or more of the dimensional stability, modulus, tensile strength, bending modulus, electrical properties, the like, or any combination thereof. The reinforcing material may be utilized in any shape which may be capable of improving one or more of the dimensional stability, modulus, tensile strength, bending modulus, electrical properties, the like, or any combination thereof of a formed structure. Exemplary forms of a reinforcing material include particles, beads, porous material, fibrous material, fabric, woven material, non-woven material, the like, or any combination thereof. The composite material blank may include a resin system. The resin system may be useful as a matrix for a reinforcing material. The resin system may include any polymeric material which can function as an epoxy and a curing agent. Exemplary resin systems useful as matrix resins include epoxy resins, polyurethanes, thermoplastic polyurethanes, polyesters, polyamides, polyolefins, styrenic resins, the like, or any combination thereof. The composite material blank may include fibers such as carbon fibers, aramid fibers, glass fibers, other structural fibers, the like, or any combination thereof. The fibers may be nonwoven structures, woven structures, or a combination of both. The fibers may be pre-coated, a woven structure may be pre-impregnated with a matrix resin, or both. For example, the composite material blank may include a carbon fiber pre-impregnated woven fabric. The composite material blank may be tacky to the touch at room temperature or may not be tacky to the touch at room temperature. The composite material blank may have a softening temperature, a curing temperature, or both. At a softening temperature, with the application of pressure, or both, the composite material blank may take on a shape of a mold which applies the pressure to the composite material blank. The composite material may include a latent curing agent so that the composite material may be cured under a reaction condition, such as temperature. The composite material may be comprised of separate components to prevent premature curing, such as a two-part resin system. The composite material may cure when the separate components are mixed with one another to form the composite material. The composite material blank may be compatible with B-staging so that the composite material blank, formed composite structure, and/or formed and cut composite structure may be stored and/or staged prior to curing. The composite material may be a thermoset plastic or thermoplastic. A thermoplastic composite material may allow scrap removed from a formed composite structure to be reutilized in forming another component, another composite material blank, another formed composite structure, and the like, or any combination thereof. Exemplary composite material compositions can be found in PCT Publication No. WO 2014/182429.
The article is comprised of at least two subassembly portions. The at least two subassemblies cooperate together to move one or more components of the article toward one another, mold (i.e., form) a composite material blank, cut a formed composite structure, or any combination thereof. The at least two subassembly portions may have any size or shape to cooperate with one another to form a composite material blank, cut a formed composite structure, or both. The at least two subassembly portions may include an upper component and a lower component. One of the at least two subassembly portions may move toward another of the at least two subassembly portions to form and/or cut a composite material. At least one of the subassembly portions may have one or more components reciprocal to one or more components of at least one other subassembly portion. Reciprocal may be defined as one component having a shape with contours substantially similar and inverse to the contours of the shape of another component. Reciprocal components may cooperate together to form a non-planar profile and/or cut a non-profile edge in a composite material. Components of the subassembly portions may include two or more die portions, two or more pressure pads, two or more shearing edges, two or more molds, one or more cavities, one or more cores, one or more tension members, one or more mating features, one or more pressure pad stopping features, one or more die portion stopping features, one or more mounts, any other components of the subassembly portion, the like, or any combination thereof.
The article may include and/or be disposed in one or more positions into which the at least two subassembly portions may transition into and/or may be disposed. The one or more positions function so that the article may receive a composite material blank, may clamp a composite material blank, may form a composite material blank, may cut a formed composite structure, may allow for removal of a formed and cut composite structure, the like, or any combination thereof. The one or more positions may be any configuration of the at least two subassembly portions which may allow for the article to receive a composite material blank, clamp a composite material blank, form a composite material blank, cut a formed composite structure, allow for removal of a formed and cut composite structure, the like, or any combination thereof. The one or more positions may include an open position, a clamping position, a forming position, a cutting position, a closed position, the like, or any combination thereof. One or more of the positions may be held static, may include continuous movement of one or more components, or both.
An open position may allow for a composite material blank to be placed between the at least two subassembly portions, a formed composite structure to be removed from between the at least two subassembly portions, or both. In the open position, the at least two subassembly portions may be distanced from one another to allow sufficient space for receiving and/or removing a composite material blank and/or structure. A clamping position may include one or more positions of one or more components of the at least two subassembly portions in which the one or more components may be able to clamp the composite material blank between the at least two subassembly portions. The clamping position may include at least one of the at least two subassembly portions moving toward another subassembly portion, at least one of the at least two subassembly portions applying a clamping force to a composite material blank to retain the blank within the article, or both. A forming position may include one or more positions of one or more components of the at least two subassembly portions in which one or more components may be able to form a composite material blank into a formed composite structure having a non-planar profile. A formed composite structure may refer to a structure formed and/or molded from a composite material blank. The forming position may include at least a portion of a subassembly portion being received within another portion of another subassembly portion to form the composite material. A cutting position or sequence of cutting positions may result in cutting at least one non-planar edge about at least a portion of a perimeter of a formed composite structure. The cutting position may include one or more positions of one or more components of the at least two subassembly portions which result in one or more components cutting at least one non-planar edge of a formed composite structure. The cutting position may include at least one shearing edge bypassing at least one other shearing edge. A closed position may include one or more positions of one or more components of the at least two subassembly portions in which one or more components have the formed and cut composite structure rested thereon, one or more components are in the last position of a forming and cutting cycle of the article before returning to an open position, or both. A formed and cut composite structure, composite structure, and/or composite material structure may refer to a material formed and/or molded from a composite material blank and cut about a least a portion of a perimeter. The closed position may include at least one subassembly portion received within another subassembly portion to the extent a stopping feature prevents further movement of the at least one subassembly portion toward the other subassembly portion. The closed position may be the final position for forming and cutting a composite material before the article returns to the open position.
The article includes two or more die portions. The two or more die portions may function to support and/or carry one or more components, move one or more components toward one or more other components, move one or more components away from one or more other components, or any combination thereof. The two or more die portions may have any size and shape suitable to support and/or carry one or more components, move one or more components toward one or more other components, move one or more components away from one or more other components, or any combination thereof. The one or more components may include one or more pressure pads, one or more shearing edges, one or more molds, one or more cavities, one or more cores, one or more tension members, one or more mating features, one or more pressure pad stopping features, one or more die portion stopping features, and the like, or any combination thereof. The two or more die portions may include an upper die and a lower die. The two or more die portions may provide movement of one or more components to provide a die force. The die force may function to clamp a composite material between the at least two die portions, form a composite material blank into a formed composite structure having a non-planar profile, cut non-planar edges at least partially about the formed composite structure, or any combination thereof. The die force may include a clamping force, a forming force, a cutting force, and the like, or any combination thereof. The two or more die portions may function as die blocks. A die block may be understood as a portion of a die to which one or more components of the article are mounted on and/or secured to. One or more die portions may be opposing one or more other die portions. For example, a first die portion and second die portion may be opposing each other side-by-side (i.e., laterally) or opposing each other vertically. At least one of the die portions may be moveable toward at least one other die portion. One or more die portions may include sub-portions. Sub-portions may be understood as a die portion segmented into a plurality of die portions. For example, an upper die may include two upper dies which cooperate with a single lower die. The one or more die portions may include one portion, two portions, or more. One or more die portions may include one or more mating or alignment features which mate, join, or align two or more die portions together. The one or more die portions may include stop features which prevent further movement of at least one die portion toward at least one other die portion.
The article includes one or more planes. The article includes a transverse plane. The transverse plane may lie in between two or more die portions (e.g., an upper die portion and a second die portion). The transverse plane may be generally parallel to a support surface of one or more die portions. The article may include a longitudinal plane. The longitudinal plane may intersect one or more die portions. The longitudinal plane may be generally perpendicular to the transverse plane. Generally parallel and generally perpendicular may include variances up to 15 degrees from parallel or perpendicular. The variances may account for manufacturing variability, tolerance stack-ups, draft angles, and the like, or any combination thereof.
Each of the two or more die portions may include one or more support surfaces. The one or more support surfaces may function to support one or more components of the article. The one or more support surfaces may have any size, shape, and/or profile to support one or more components of the article. At least one of the support surfaces may be in an opposing relationship toward at least one other support surface. For example, an upper die may include a support surface opposing a support surface of a lower die. The two or more support surfaces may be attached to one or more components of a subassembly portion. The two or more support surfaces may be attached to one or more components which are useful in molding (i.e., forming) and/or cutting a composite material. The two or more support surfaces may be attached to one or more components of a subassembly portion which may clamp, form, cut, apply pressure, provide a force, restrict or prevent movement, and/or the like to composite material blank, composite structure, another component of a subassembly portion, or any combination thereof. Exemplary components include one or more pressure pads, one or more molds, one or more shearing edges, one or more cavities, one or more cores, one or more tension members, one or more mating features, one or more die portion stopping members, one or more mounts, one or more pressure pad stopping features, and the like, or any combination thereof. One or more of the support surfaces may be configured to move toward one or more other support surfaces. A support surface of at least one die portion may be configured to move toward a support surface of another die portion to apply a die force, mold or form one or more composite material blanks, cut one or more formed composite structures, or any combination thereof.
The article includes two or more pressure pads. One or more of the pressure pads may function to apply pressure onto an opposing pressure pad, retain a perimeter portion of a composite material blank between at least two subassembly portions, mold and/or form one or more portions of a composite material, or any combination thereof. The two or more pressure pads may have any size and/or shape to apply pressure onto an opposing pressure pad, retain a perimeter portion of a composite material blank between at least two subassembly portions, mold and/or form one or more portions of a composite material, or any combination thereof. One or more pressure pads may be attached to one or more components which may clamp, form, cut, apply pressure, provide a force, restrict or prevent movement, and/or the like to composite material blank, composite structure, another component of a subassembly portion, or any combination thereof. One or more of the pressure pads may be attached to one or more of the die portions, one or more tension members, one or more pressure pad stopping features, one or more mounts, any other component of the article, or any combination thereof. One or more pressure pads may be rigidly affixed to a die portion. One or more pressure pads may be rigidly affixed to a support surface of a die portion. One or more pressure pads may be affixed to a die portion so that the pressure pad moves with the die portion, a support surface, or both. One or more pressure pads may be moveably attached to a die portion or a support surface of a die portion. One or more pressure pads may be affixed to a die portion so that the pressure pad moves relative to a die portion. The one more pressure pads may be attached to the die portion with a connector that facilitates movement of the pressure pads relative to the die portion. A connector may include any connection which functions to facilitate movement of one or more pressure pads relative to a die portion. Exemplary connectors include tension members, threaded fasteners, guide pins, rods, bushings, and the like, or any combination thereof. Threaded fasteners may include one or more bolts, shoulder bolts, screws, studs, nuts, the like, or any combination thereof. For example, one or more pressure pads may be attached to a die portion with one or more tension members to allow movement of the pressure pad relative to the die portion. One or more of the pressure pads may cooperate with one or more other pressure pads to retain a composite material blank, formed composite structure, formed and cut composite structure (i.e., perimeter region, edges, and/or any other region); mold and/or form one or more portions of a composite material; or any combination thereof. One or more of the pressure pads may apply a clamping force to one or more opposing pressure pads to retain a perimeter region of a composite material blank located between the opposing pressure pads. One or more pressure pads may apply a die force to one or more opposing pressure pads to form an edge about a composite material blank. One or more of the pressure pads may cooperate with one or more components of the article to cut about an edge and/or a perimeter of a formed composite structure. For example, one or more pressure pads may cooperate with another one or more pressure pads, one or more molds, one or more shearing edges, or any combination thereof to cut about an edge and/or a perimeter of a formed composite structure.
One or more of the pressure pads may be comprised of one or more materials suitable for applying a die force on one or more other components of the article, molding and/or forming one or more portions of a composite material structure, cutting one or more portions of a composite material structure, or any combination thereof. The one or more materials of the one or more pressure pads may include any material useful for applying a die force on one or more other components of the article, molding and/or forming one or more portions of a composite material structure, cutting one or more portions of a composite material structure, or any combination thereof. Example components include one or more opposing pressure pads, one or more molds, one or more shearing edges, or any combination thereof. For example, the one or more pressure pads may be comprised of a metal, a polymeric material, and the like, or any combination thereof. An exemplary metal may include steel. Exemplary polymeric materials may include polyamide, nylon, plastic, thermoplastic, styrene, and the like, or any combination thereof. One or more of the pressure pads may be comprised of a single pressure pad or a plurality of pressure pads.
The two or more pressure pads may have any size or shape suitable for retaining a perimeter region of a composite material blank between at least two subassembly portions, forming a composite material structure, cutting a formed composite structure, retaining one or more other components of at least one of the subassembly portions within an interior and/or recess of the pressure pad, or any combination thereof. The two or more pressure pads may have any shape suitable for cooperating with one or more molds, retaining one or more molds within an interior and/or recess of a pressure pad, or both. At least one of the pressure pads may include a recess. The recess may be located within an interior of a pressure pad. The recess may function to have one or more molds disposed within a pressure pad. One or more molds may be located within a recess. For example, an upper mold may be located within a recess of the upper pressure pad, a lower mold may be located within a recess of the lower pressure pad, or both. The two or more pressure pads may have reciprocal shapes to one another, the formed and cut composite structure, or both. Reciprocal may mean a shape substantially similar and/or inverse to one another. The two or more pressure pads may have a shape negative to a surface of a formed composite structure, such as an outer perimeter region of the formed and cut composite structure. Negative may mean a shape and/or contour substantially similar and inverse. A reciprocal and/or negative shape to an opposing pressure pad and/or the outer perimeter region of the formed and cut composite structure may allow two or more pressure pads to cooperate and apply a clamping force to retain the perimeter region between the two or more pressure pads and/or allow a formed composite structure to be cut along one or more non-planar edges to minimize the amount of scrap. By minimizing the amount of scrap, excess material remaining on the formed composite structure may be reduced. Excess material may be defined as material about the perimeter of the composite material blank and/or formed composite structure removed (i.e., scrapped) to expose one or more edges of the formed and cut composite material structure. Prior to removal, the excess material may have a linear thickness which may be the distance from the future exposed one or more edges outward to the perimeter of the formed composite structure. The article may allow for about 0 mm or more, about 1 mm or more, or even about 2 mm or more of excess material to be used to provide for suitable clamping of the composite material blank between the two or more pressure pads. The article may allow for about 5 mm or less, about 4 mm or less, or even about 3 mm or less of excess material to be used to provide for suitable clamping of the composite material blank between the two or more pressure pads. The article may provide for a reduction of about 83% or greater, about 87% or greater, or even about a 90% or greater in the amount of excess material required to provide for suitable clamping of the composite material blank between the pressure pads. The article may provide for a reduction of about 100% or less, about 97% or less, or even about 93% or less in the amount of excess material required to provide for suitable clamping of the composite material blank between the pressure pads. The reciprocal shapes of the pressure pads may enable the one or more pressure pads to apply a clamping force, die force, or both to one or more opposing pressure pads. For example, an upper pressure pad may have a reciprocal shape and contour to a lower pressure pad.
The one or more pressure pads may include one or more pressure surfaces. The one or more pressure surfaces may function to cooperate with other one or more pressure surfaces, clamp a perimeter region of a composite material blank, retain a composite material blank and/or structure between the at least two subassembly portions, clamp a perimeter region of a formed composite structure, or any combination thereof. The one or more pressure surface may have any size, shape, contour, and/or profile to cooperate with one or more other pressure surfaces, retain a composite material blank and/or structure between the at least two subassembly portions, clamp a perimeter region of a composite material blank, clamp a perimeter region of a formed composite structure, or any combination thereof. The one or more pressure surfaces may be surfaces of the one or more pressure pads opposing a support surface of a die portion, not attached to a die portion, not in direct contact with a die portion, not directly adjacent to a die portion, not directly adjacent to a support surface, or any combination thereof. The one or more pressure surfaces may be opposing and/or facing one or more other pressure surfaces, one or more support surfaces of one or more die portions, one or more other pressure pads, or any combination thereof. The one or more pressure surfaces may include an upper pressure surface, a lower pressure surface, or both. An upper pressure surface may oppose and face toward a lower pressure surface. One or more pressure surfaces may cooperate with one or more other pressure surfaces to clamp a perimeter region of a composite material. One or more pressure surfaces may have a reciprocal contour to one or more other pressure surfaces. For example, an upper pressure surface may have a reciprocal contour to a lower pressure surface. One or more pressure surfaces may be non-planar. A non-planar pressure surface may be curved, angled or both relative to a transverse plane, a longitudinal plane, or both of the article. One or more edges of a pressure pad located about a perimeter of a pressure surface may cooperate with another pressure pad, one or more molds, or any combination thereof to cut about an edge of a formed composite structure.
The article may include one or more shearing edges. The one or more shearing edges may function to cut the composite material, wherein one or more of the cuts may create one or more edges, wherein one or more of the edges may be non-planar. In cutting the composite materials the one or more shearing edges may cooperate with another component of an opposing sub assembly, for example one or more other shearing edges of another pressure pad, another mold, any other component of the article, or any combination thereof. The shearing edge may have any size and/or shape to cut composite material, cut one or more non-planar edges, cooperate with one or more other shearing edges, or any combination thereof. One or more shearing edges of a pressure pad and/or a mold may cooperate with one or more shearing edges of another pressure pad, another mold, any other component of the article, or any combination thereof. The one or more shearing edges may be located in any position that facilitates making the desired cut. The one or more shearing edges may be disposed on any component or portion of a component of a subassembly portion which allows formation of a cut edge of the formed composite structure. A shearing edge part of an upper subassembly portion may be referred to as an upper shearing edge. A shearing edge part of a lower subassembly portion may be referred to as a lower shearing edge. Exemplary components include one or more pressure pads, one or more molds, or both. Exemplary portions of components which the one or more shearing edges may be disposed on or be part of may include: at least partially about a perimeter of one or more pressure pads; at least partially about an inner perimeter of a pressure pad; along or adjacent a pressure surface of a pressure pad, opposing a pressure surface of another pressure pad; located at least partially about a perimeter of one or more molds; at least partially about an outer perimeter of one or more molds; about an edge of a mold adjacent to a pressure pad; about an edge of a mold adjacent to a pressure surface of an of a pressure pad, or any combination thereof. One or more shearing edges may cut a formed composite structure by bypassing one or more other shearing edges. For example, one or more shearing edges of one or more pressure pads may cut a composite structure by bypassing one or more shearing edges of one or more molds and/or vice-versa. The one or more shearing edges may be non-planar. Non-planar shearing edges may have any shape that provides the desired cut. Non-planar shearing edges may be curved, angled, or both relative to a transverse plane of the article, a longitudinal plane of the article, or both. One or more shearing edges may have a reciprocal contour to one or more other shearing edges. For example, one or more shearing edges of one or more pressure pads may have a reciprocal contour to one or more shearing edges of one or more molds and/or vice-versa.
The article includes one or more molds. The one or more molds may function to shape a composite material blank into a formed composite structure having three-dimensional and/or non-planar geometry. The one or more molds may have any size and/or shape to shape a composite material blank into a formed composite structure having three-dimensional and/or non-planar geometry. The one or more molds may include an upper mold, a lower mold, or both. One or more of the molds may be attached to one or more die portions. For example, the one or more molds may be attached to one or more support surfaces of one or more die portions, one or more tension members, or any combination thereof. One or more molds may be attached to one or more die portions with one or more tension members, one or more threaded fasteners, the like, or any combination thereof. For example, a mold may be attached to a die portion with one or more springs, one or more threaded fasteners, the like, or any combination thereof. One or more threaded fasteners may include one or more bolts, screws, studs, nuts, the like, or any combination thereof. One or more molds may have an exterior surface or exterior wall about an outer perimeter of the one or more molds. The exterior surface may have a shape which is reciprocal, similar, or identical to an inner wall located about a recess of one or more pressure pads. One or more molds may include reciprocal and mating shapes to cooperate with one or more other molds. By cooperating with one or more other molds, one or more molds may form a composite material blank into a formed composite structure having three-dimensional and non-planar geometry.
One or more of the molds include a cavity, a core, or both. The cavity, the core, or both may function to form a composite material blank into a formed composite structure having three-dimensional geometry and non-planar contours. The cavity, the core, or both may have any size and/or shape suitable for forming a composite material blank into a formed composite structure having three-dimensional geometry and non-planar contours. The core, the cavity, or both may be shaped as desired opposing surfaces of the formed composite structure. The core, the cavity, or both may be negatives of the formed composite being formed and/or molded within the one or more molds. The cavity, the core or both may be a hollow portion in one or more molds. The cavity, the core, or both may be a protrusion or outwardly extending surface of one or more molds. The cavity may have a reciprocal shape to the core. The cavity, the core, or both may be shaped to receive an opposing cavity, core, composite material blank therebetween, or any combination thereof. The cavity, the core, or both may cooperate with another cavity and/or core to form a composite material blank into a formed composite structure. A cavity may include a cavity surface. The cavity surface may be non-planar so that the cavity surface is curved, angled, or both relative to a transverse plane of the article. A core may include a core surface. The core surface may have a reciprocal shape to the cavity surface. The core surface may be non-planar so that the core surface is curved, angled, or both relative to a transverse plane of the article. The core surface may be substantially reciprocal with the cavity surface. All or portions of the core surface may be at an offset angle to portions of the cavity surface. The offset angle may provide for a draft angle. The core surface, cavity surface, or both may be negatives of opposing surfaces of the formed composite material.
The article may include one or more tension members. The one or more tension members may function to manage and absorb pressure of one or more components of one or more sub-assemblies; optimize a die force and/or pressure to restrain a composite material blank, formed composite structure, and/or formed and cut composite structure located within the article; provide a controlled return pressure; allow one or more molds, one or more pressure pads, or both to move toward or relative to one or more die portions; or any combination thereof. The one or more tension members may have any configuration, shape, and/or size to manage and absorb pressure of one or more components of one or more sub-assemblies; optimize a die force and/or pressure to restrain a composite material blank, formed composite structure, and/or formed and cut composite structure located within the article; provide a controlled return pressure; allow one or more molds, one or more pressure pads, or both to move toward or relative to one or more die portions; or any combination thereof. The one or more tension members may optimize pressure on a composite material blank to help reduce or prevent wrinkling in the composite material blank during clamping, forming, or both; and/or may provide at least a portion of a die force to form a composite material blank into a formed composite structure, cut a formed composite structure into a formed and cut composite structure, or both. The one or more tension members may be part of or attached to one or more subassemblies; one or more components of one or more subassemblies; or both. For example, one or more tension members may be attached to one or more die portions. One or more tension members may extend from one die portion to an opposing die portion; may extend from a support surface toward an opposing support surface; may be attached to one or more pressure pads, one or more molds, or both; may connect one or more molds and/or one or more pressure pads to one or more die portions; or any combination thereof. One or more tension members may include one or more upper tension members, one or more lower tension members, or both. One or more upper tension members may be part of or connected to one or more upper subassemblies, one or more lower tension members may be part of or connected to one or more lower subassemblies, or both.
The one or more tension members may include any suitable device having a suitable initial force, maximum force upon contact, tensile strength, abrasion and tear resistance, load bearing capabilities, and/or compression properties. The one or more tension members may have a spring stiffness (i.e., spring constant) of about 20 lb/in (3.5 N/mm) or greater, about 40 lb/in (7.0 N/mm) or greater, or even about 80 lb/in (14 N/mm) or greater. The one or more tension members may have a spring stiffness (i.e., spring constant) of about 180 lb/in (31.5 N/mm) or less, about 160 lb/in (28 N/mm) or less, or even about 140 lb/in (24.5 N/mm) or less. The one or more tension members may singularly or in combination apply a force per unit cut length during clamping, forming, and/or cutting of a composite material in the article. The force per unit cut length during clamping and/or forming of a composite material may be about 3.0 N/mm or greater, about 3.1 N/mm or greater, or even about 3.2 N/mm or greater. The force per unit cut length during clamping and/or forming of a composite material may be about 3.7 N/mm or less, about 3.6 N/mm or less, or even about 3.5 N/mm or less. The force per unit cut length during cutting of a composite material may be about 5 times or greater, about 6 times or greater, or even about 7 times or greater than during clamping and/or forming. The force per unit cut length during cutting of a composite material may be about 10 times or less, about 9 times or less, or even about 8 times or less than during clamping and/or forming. One or more tension members may include any material or component with the ability to store energy, release energy, or both. One or more tension members may include one or more springs, one or more elastomeric systems, or both. One or more elastomeric systems may include polymeric materials, such as polyurethane. A suitable exemplary elastomeric system may include Formathane® Urethane sold by Dayton Lamina. One or more springs may include a nitrogen spring, a service spring, a mold return spring, a mega coil spring, a die spring, and the like, or any combination thereof. Suitable exemplary nitrogen springs may include DADCO® Part No. SC.01800.40.TO, charge 1,450 PSI and/or DADCO® Part No. SC.00740.25.TO, charge 370 PSI sold by Dadco, Inc. One or more of the tension members may be stiffer than one or more other tension members. One or more tension members which are part of a lower sub-assembly may be stiffer than one or more tension members which are part of an upper sub-assembly and/or vice-versa. For example, one or more lower tension members may be stiffer than one more upper tension members or vice-versa. One or more tension members may be stiffer than other tension members to allow one or more components of one or more subassemblies to cooperate with one or more other components of one or more subassemblies. One or more tension members may have a different stiffness to allow one or more shearing edges to bypass one or more other shearing edges. For example, one or more lower tension members may be stiffer so that as the upper die portion moves toward the lower die portion to a cutting position, the upper die portion may be able to compress the one or more upper tension members at a greater compression distance than the upper die portion may be able to compress the one or more lower tension members. By compressing the upper tension members at a greater distance, the upper die portion may be able to move closer toward an upper mold than the lower pressure pad may be able to move toward the lower die portion. The difference in compression of the one or more upper tension members compared to the one or more lower tension members allows an upper shearing edge to bypass a lower shearing edge. Nitrogen springs may be advantageous by providing high forces in compact areas. The one or more tension members may have one or more spring preloads which may result in die press or forming forces between one or more opposing molds.
The article may include one or more pressure pad stopping features. The one or more pressure pad stopping features may function to limit movement of one or more pressure pads. The one or more pressure pad stopping features may have any configuration, shape, and/or size to limit movement of one or more pressure pads. An exemplary pressure pad stopping feature may include one or more stop pins, one or more threaded fasteners, the like, or any combination thereof. One or more threaded fasteners may include one or more bolts, shoulder bolts, screws, studs, nuts, the like, or any combination thereof. One or more shoulder bolts may be useful in limiting travel of the one or more pressure pads toward the one or more support surfaces of a die portion to which the pressure pad is affixed. The one or more pressure pad stopping features may be part of or attached to one or more subassembly portions. The one or more pressure pad stopping features may be attached to any component of a subassembly portion to limit movement of one or more pressure pads. The one or more pressure pad stopping features may be attached to one or more die portions, one or more pressure pads, or both. For example, one or more pressure pad stopping features may be attached to a support surface of a die portion. The one or more pressure pad stopping features may prevent one or more pressure pads from rising or lowering too far when free from a die force from an opposing pressure pad. For example, one or more pressure pad stopping features may prevent a lower pressure pad from rising too far when free from a die force from an upper pressure pad, may prevent an upper pressure pad from lowering too far when free from a die force from a lower pressure pad, or both.
The article may include one or more mating features. The one or more mating features may function to align one or more die portions with one or more other die portions, prevent lock-up of the article, or both. The one or more or more mating features may be any configuration, shape, and/or size to align one or more die portions with one or more other die portions, prevent lock-up of the article, or both. Exemplary mating features may include one or more alignment pins, one or more bushings, one or more die interlocks, the like, or any combination thereof. Exemplary suitable die interlocks may include Part Nos. PLF0001 to PLF0005 and/or PLM0001 to PLM0005 sold by DME of Milacron®. The one or more mating features may be located on any part of one or more subassembly portions to align one or more die portions with one or more other die portions, prevent lock-up of the article, or both. One or more mating features may extend from one die portion toward an opposing die portion One or more mating features may extend from a support surface of one die portion toward an opposing support of another die portion. One or more mating features may be concentrically aligned with one or more other mating features. One or more mating features may be located at one or more corners, one or more edges, about at least a portion of a perimeter, or any combination thereof of a die portion. In an open position, one or more mating features may be concentric with and/or distanced from one or more opposing mating features. In a forming position, cutting position, closed position, or any combination thereof, one or more mating features may be concentric, aligned with, and/or inside of one or more opposing mating features.
The article may include one or more die portion stopping features. The one or more die portion stopping features may function to prevent and/or stop movement of one die portion toward another die portion, prevent over-travel of one or more components of the article, cooperate with one or more other die portion stopping features, cooperate with one or more mating features, or any combination thereof. The one or more die portion stopping features may have any configuration, size, and or shape to prevent and/or stop movement of one die portion toward another die portion, prevent over-travel of one or more components of the article, cooperate with one or more other die portion stopping features, cooperate with one or more mating features, or any combination thereof. The one or die portion stopping features upon contacting one or more opposing die portion stopping features, or any other component of a subassembly portion, may prevent further movement of one or more die portions toward one or more other die portions. The one or more die portion stopping features may include one or more stop blocks, one or more press dampers, the like, or any combination thereof. For example, each individual stop block may include a press damper. The press damper may prevent slamming of the article into a closed position. The one or more die portion stopping features may include one or more upper die portion stopping features, one or more die portion stopping features, or both. The one or more die portion stopping features may be part of or attached to one or more subassembly portions. The one or more die portion stopping features may be attached to one or more die portions. The one or more die portion stopping features may be attached to one or more support surfaces of one or more die portions; may extend from one support surface toward an opposing support surface, an opposing die portion stopping feature, or both; and/or may be located adjacent to one or more mating features. The one or more die portion stopping features may have any shape, such as cubed, cylindrical, spherical, pyramided, prismed, coned, the like, or any combination thereof. The one or more die portion stopping features may come into contact with one or more other die portion stopping features when the article is in a final cutting position, closed position, or both. The one or more die portion stopping features may prevent movement of the one or more die portions toward one or more other die portions after the article reaches the final cutting position. One or more die portion stopping features may be sized to allow for bypassing of a shearing edge relative to another shearing edge so as to allow one or more shearing edges to cut one or more edges of a formed composite structure. One or more die portion stopping features may be sized to allow one or more shearing edges to bypass one or more other shearing edges by 1 mm or greater, 2 mm or greater, or even 3 mm or greater. One or more die portion stopping features may be sized to allow one or more shearing edges to bypass one or more other shearing edges by 15 mm or less, 12 mm or less, or even 10 mm or less. The one or more die portion stopping features may be interchangeable with one or more die portion stopping features of different sizes (i.e., height or thickness) so that differently sized die portion stopping features may be used to adjust a bypass distance of one or more shearing edges relative to one or more other shearing edges. The one or more die portion stopping features may provide a low cost and simple solution for adjusting the bypass distance of the one or more shearing edges relative to one or more other shearing edges.
The article may be disposed in one or more positions. The one or more positions may provide positions of one or more components of the article relative to other components of the article to allow a composite material blank to be loaded into the article, a formed composite structure to be removed from the article, a composite material blank to be clamped in the article, a composite material blank to be molded or formed into a formed composite structure, a formed composite structure to be cut, or any combination thereof. The one or more positions may include any position the article may be disposed in to allow a composite material blank to be loaded into the article, a formed composite structure to be removed from the article, a composite material blank to be clamped in the article, a composite material blank to be molded or formed into a formed composite structure, a composite material to be cut, or any combination thereof. The one or more positions may depend on a step being performed during a particular time in forming and cutting a composite material blank. The one or more positions may include an open position, a clamping position, a midway forming position, a final forming position, a cutting position, or any combination thereof. The article may operate in a continuous press operation. In a continuous press operation, the article may transition between one or more positions without pausing. In a continuous press operation, the article may transition from an open position to a closed position in one stroke, such as a closure stroke. The rate of the closure stroke may be consistent from the open position to the closed position or may be adjustable to decrease or increase the draw speed of the article. The article may be a discontinuous press operation. In a discontinuous press operation, the article may pause at one or more positions before transitioning to another position, may change speeds while transitioning to one or more positions, or both. The article may rest in an open position.
The article may be disposed in an open position. The open position may be a position of one or more components of the at least two subassembly portions which allow a composite material blank to be placed into the article, a formed and cut composite structure to be removed from the article, or both. The open position may be any position the article may be disposed in to allow a composite material blank to be placed into the article, a formed and cut composite structure to be removed from the article, or both. In the open position, one or more die portions, one or more pressure pads, one or more molds, one or more mating features, and/or one or more die portion stopping features, may be distanced from and opposing one or more other die portions, one or more other pressure pads, one or more other molds, one or more other mating features, and/or one or more other die portion stopping features to allow for a composite material blank to be inserted and/or removed from within two or more subassembly portions. In the open position, one or more components of an upper subassembly portion may be distanced from one or more components of a lower subassembly portion. In the open position, there may be sufficient distance between the one or more die portions, one or more pressure pads, one or more molds, or any combination thereof to locate and/or remove a composite material blank from therebetween. In an open position, one or more components of one a subassembly may be aligned to provide support and/or prevent premature deformation of a composite material blank when placed thereon. In an open position, a pressure surface of a pressure pad and a surface of a mold may be relatively aligned to provide support to a composite material lank, prevent premature deformation of a composite material blank when placed onto a pressure pad and/or mold, or both. For example, in the open position, an upper pressure surface of a lower pressure pad and an upper core surface of a lower mold may be relatively aligned. In the open position, one or more tension members may be in a relatively uncompressed state. In the open position, the one or more pressure pad stopping features may prevent a pressure pad from extending beyond a certain distance from one die portion toward an opposing die portion. In the open position, there may be no pressure, die force, clamping force, or any other force applied to the one or more pressure pads, one or more molds, or both. After a composite material blank is placed into the article, one or more components of the upper subassembly portion may be distanced from the composite material blank. For example, in the open position an upper pressure pad, an upper mold, or both do not contact the composite material blank. After a composite material blank is placed into the article, the article may be transitioned from an open position to a clamping position.
The article may be disposed in a clamping position. The clamping position may allow a composite material blank to be retained in between the article. The clamping position may be any position the article may be disposed in to allow a composite material blank to be retained between in the article. To move from the open position to the clamping position, one or more die portions may move toward one or more other die portions to apply a clamping force to the composite material blank. In the clamping position, one or more mating features (i.e., alignment pins) may be partially received within one or more other mating features (i.e., bushings). In the clamping position, one or more pressure pads, one or more molds, or both may be in direct contact with the composite material blank. In the clamping position, one or more pressure pads, one or more molds, or both may be in at least partial direct contact with opposing surfaces of the composite material blank. In the clamping position, two or more pressure pads may apply a clamping force about a perimeter region of the composite material blank. The clamping force may be sufficient to retain the perimeter region of the composite material blank in place as the article moves from a clamping position to a forming position, a cutting position, a closed position, or any combination thereof. The clamping force may be large enough to prevent wrinkling of the composite material blank, encourage temporary and/or permanent bonding of multiple sheets and/or layers of a composite material together, or both. The clamping force may be small enough to prevent tearing of the composite material blank, allow sliding of the composite material blank to take on the shape of one or more molds, or both. After a composite material blank is clamped in the article, the article may be transitioned from a clamping position to a forming position.
The article may be disposed in a forming position. The forming position may function to form and/or mold a composite material blank into a formed composite structure. The forming position may be any position the article may be disposed in which can form and/or mold the composite material blank into a formed composite structure. The forming position may be a static position of one or more components of the article, or may be a continuous movement of one or more components of the article. In the forming position, a composite material blank may be located between two or more components of two or more subassembly portions and molded into a formed composite structure. For example, the composite material blank may be located between the upper die and lower die and be molded (i.e., formed) into a formed composite structure. Movement from the open position, clamping position, or both to the forming position may include travel of the at least one die portion toward at least one other die portion, travel of one or more molds toward one or more other molds, receiving at least a portion of one or more molds within at least a portion of the one or more other molds, receiving a core of a mold in a cavity of a mold, or any combination thereof. The composite material blank may be formed into the formed composite structure when one or more molds is at least partially received within one or more other molds. One or more molds may apply pressure to one or more opposing molds to form the composite material blank into a shape reciprocal with the cavity, the core, or both. Due to the pressure between the opposing molds, layers of the composite material blank may be bonded together. In the forming position, one or more tension members may be at least partially compressed. For example, one or more upper tension members may be compressed. In the forming position, the article may be operable to hold the composite material blank between one or more die portions with an appropriate amount of pressure to form the composite material blank into a formed composite structure. The appropriate amount of pressure may allow the composite material blank to conform to and slide on one or more pressure pads, one or more molds, or both to conform to a shape formed between the die portions. The appropriate amount of pressure may allow the composite material blank to slide within the article without resulting in wrinkling, tearing, or damage to the composite material blank. In the forming positon, one or more pressure pads may continue to apply pressure about a perimeter region of the composite material to retain the perimeter region between the pressure pads. After forming the composite material blank into a formed composite structure, the article may be transitioned from the forming position to a cutting position.
The article may be disposed in a cutting position. In the cutting position, one or more edges about at least a portion of a perimeter region of a formed composite structure may be cut into one or more cut edges to result in a formed and cut composite structure. The cutting position may be any position or series of positions the article may be disposed in to cut about at least a portion of a perimeter region of a formed composite structure to provide one or more cut edges and result in a formed and cut composite structure. The cutting position may be a continuous movement among a series of positions of one or more components of the article. Movement from the open position, clamping position, forming position, or any combination thereof to a cutting position may include travel of one or more die portions further toward one or more other die portions, travel of one or more pressure pads toward one or more molds, travel of one or more pressure pads at least partially beyond at least a portion of one or more molds, travel of one or more shearing edges toward one or more other shearing edges, travel of one or more shearing edges past one or more other shearing edges, or any combination thereof. Movement of one or more die portions toward one or more other die portions may result in movement of one or more pressure pads closer toward an opposing die portion. Movement of one or more pressure pads may result in movement of one or more shearing edges closer toward an opposing die portion. In the cutting position, movement of one or more die portions toward one or more other die portions may cause one or more shearing edges to bypass one or more other shearing edges. By one or more shearing edges bypassing one or more other shearing edges, the formed composite structure may be cut at least partially about a perimeter region. One or more of the tension members may be compressed to allow one or more shearing edges to bypass one or more other shearing edges. One or more tension members may be more compressed than one or more other tension members to allow one or more shearing edges to bypass one or more other shearing edges. For example, the one or more upper tension members may be further compressed than one or more lower tension members.
The article may be disposed in a closed position. The closed position may be the position the article is disposed in at the completion of a downward stroke before commencing an opening and/or return stroke. The closed position may be any position the article may be disposed in after forming and cutting a composite material which may function as the completion of a downward stroke, commencement of a return stroke, or both. In the closed position, one or more of the die portions may have moved towards one or more other die portions, one or more molds may have moved and been received by or within one or more other molds, one or more pressure pads may be in contact with or applying pressure to one or more other pressure pads and/or one or more tension members, or any combination thereof. In the closed position, one or more molds may clamp one or more layers of formed composite structure in between the one or more molds. In the closed position, the one or more pressure pads may clamp cut edges about a perimeter region of the formed composite structure between the one or more pressure pads. In the closed position, one or more die portion stopping features may be in contact with one or more other die portion stopping features. In the closed position, the one or more mating features may be fully mated. In the closed position, some or all of the one or more tension members may be relatively fully compressed. In the closed position, some or all of the one or more tension members may be ready to apply at least a portion of a return force. The return force may assist one or more components in returning the article to an open position. In the closed position, a portion of one or more pressure pads may be located past a portion of one or more molds. In the closed position, one or more shearing edges may be located past one or more other shearing edges. After reaching the closed position, the article may have an opening and/or return stroke. The opening and/or return stroke may return the article to the open position.
A method of forming a composite material structure may include (i) clamping a composite material blank between an upper die and lower die, (ii) forming a composite material blank into a non-planar composite structure, and (iii) cutting one or more edges of the formed composite structure to form one or more non-planar cut edges and a formed and cut composite structure. The method of forming a composite material structure may further include: placing a composite material blank within the article; removing a formed and cut composite structure from the article; curing a composite material structure; or any combination thereof. The method of forming the composite material structure may include a short cycle time. A short cycle time may allow the composite material blank to be formed and cut into composite structure within a time suitable for automated production, mass production, commercialization, the like, or any combination thereof. A short cycle time may be about 6 minutes or less, about 5 minutes or less, or even about 3 minutes or less. A short cycle time may be about 0.1 minutes or more, about 0.5 minutes or more, or even about 0.8 minutes or more. The method of forming a composite material structure may include heating composite material blanks (i.e., sheets) up to a softening temperature prior to placement into the article. The softening temperature may be about 90° C. or less, about 80° or less, or even about 85° or less. The softening temperature may be about 50° C. or greater, about 60° C. or greater, or even about 65° or greater. The composite material blank may be heated at the softening temperature for a duration of time to soften and allow for flexing such that the composite material blank may be formed into the formed composite material structure upon the application of force from the article. The composite material blank may be heated at the softening temperature for a duration of time which may not result in curing of the composite material. The duration of time the composite material blank may be exposed to the softening temperature may be from about 0.1 minutes or more, about 2 minutes or more, or even about 3 minutes or more. The duration of time the composite material blank may be exposed to the softening temperature may be from about 6 minutes or less, about 5 minutes or less, or even about 4 minutes or less. The softening temperature may be below a curing temperature of the composite material. A softening temperature may be about 150° C. or less, about 130° C. or less, or even about 110° C. or less below a curing temperature. A softening temperature may be about 40° C. or more, about 60° C. or more, or even about 80° C. or more below a curing temperature. The curing temperature may be about 200° C. or less, about 180° C. or less, or even about 160° C. or less. The curing temperature may be about 130° C. or greater, about 140° C. or greater, or even about 150° C. or greater.
The method of forming a composite material structure may include placing a composite material blank in the article. The composite material blank may be placed in between the two or more die portions. The composite material blank may be placed onto one or more pressure pads, one or more molds, or both. The composite material blank may be located onto one or more pressure pads so that a center of the composite material blank is approximately centered with a core of one or more molds. The composite material blank may be located onto one or more pressure pads so that a perimeter region of all or a portion of the composite material blank extends outward to one or more pressure surfaces of one or more pressure pads. The composite material blank may rest on the one or more molds or may be free of contact with one or more molds when initially placed into the article.
The method of forming a composite material structure includes clamping the composite material blank in the article. Clamping the composite material may include the article moving from the open position to the clamping position, with the composite material blank therebetween. Clamping the composite material blank may include moving one or more die portions toward one or more other die portions. Clamping the composite material blank may include contacting the composite material blank with one or more pressure pads, one or more molds, or both. Clamping the composite material blank may include retaining the composite blank between the at least two assembly portions. Clamping the composite material blank may include contacting and retaining the perimeter region of the composite material blank with one or more pressure surfaces of one or more pressure pads. Clamping the composite material blank may be useful in retaining the composite material blank in place during steps of forming, cutting, or both.
The method of forming a composite material structure includes forming or molding the composite material blank into a formed composite structure. Forming the composite material structure may include the article transitioning from an open position or a clamping position to a forming position. Forming the composite material structure may include moving one or more die portions toward one or more other die portions. Forming the composite material structure may include moving one or more molds towards one or more other molds, receiving one or more molds within one or more other molds, or both. Forming the composite material structure may include receiving a core within a cavity with the composite material blank therebetween. As the core is received within the cavity, the composite material blank may deform and take on the shape of the core and the cavity. After the composite material blank may be fully deformed and reciprocal to the core and the cavity, the composite material blank may be a formed composite structure. During forming, the article may be maintained at room temperature and/or cooled to a lower temperature to draw heat out of the composite material blank. Heating of the composite material blank, cooling of the tool, or both may assist in the formed composite structure retaining a formed shape after removal from the article.
The method of forming a composite material structure includes cutting a formed composite structure. Cutting the formed composite structure to provide for a formed and cut composite structure may include the article transitioning from an open position, a clamping position, a forming position, or any combination thereof to a cutting position, a closed position, or both. Cutting the formed composite structure may include one or move die portions moving toward one or more other die portions. Cutting the formed composite structure may include one or more pressure pads cooperating with one or more molds. Cutting the formed composite structure may include one or more shearing edges bypassing one or more other shearing edges. The one or more shearing edges may be located about a perimeter region of the formed composite structure. The shearing edges bypassing one another may result in edges about the perimeter region of the composite material being cut. The perimeter region may be cut into non-planar edges. During the step of cutting a formed composite structure, the one or more tension members singularly or in combination may apply a force or load of about 100 pounds per linear inch of spring (17.5 N/mm) or greater, about 200 lbs per linear inch of spring (35 N/mm) or greater, or even about 250 lbs per linear inch of spring (43.8 N/mm) or greater. During the step of cutting a formed composite structure, the one or more tension members may apply a force or load of about 500 pounds per linear inch of spring (87.6 N/mm) or less, about 400 pounds per linear inch of spring (70.1 N/mm) or less, or even about 350 pounds per linear inch of spring (61.3 N/mm) or less. After cutting the composite material, the article may transition into a closed position.
The method of forming a composite material structure includes removing a formed and cut composite structure from the article. Removing the cut and formed composite structure may include the article transitioning to an open position from a cutting position, closed position, or both. Removal of the composite material may include one or more die portions moving away from one or more other die portions. Removal of the composite material may include moving one or pressure pads, one or more molds, or both away from contacting the formed and cut composite structure. For example, the one or more pressure pads and one or more molds may be moved away from the composite material and an opposing die portion, so that the formed and cut composite structure remains resting on the one or more opposing pressure pads, one or more molds, or both. Removal of the formed and cut composite structure may be complete manually or robotically. Removal of the formed and cut composite structure may occur immediately after returning the article to the open position or may be delayed. Removal of the formed composite structure may be aided by a draft angle of about 90° or less, about 80° or less, or even about 70° or less. Removal of the formed composite structure may be aided by a draft angle of about 3° or more, about 5° or more, or even about 10° or more. Removal of a formed and cut composite structure from the article may also include removal of scrap from the article. The scrap may include the one or more edges cut from the formed composite structure. The scrap may be recycled and reused in a subsequent formed composite structured formed by an article.
The method of forming a composite material structure may include curing the composite material. Curing may allow the formed and cut composite structure to permanently retain its molded (i.e., formed) shape. Prior to curing, the formed and cut composite structure may be removed from the article or may remain in place within the article. After removal from the article or remaining in the article, the formed and cut composite structure may be subjected to curing. The formed and cut composite structure may be immediately sent to a curing process or may be stored for later curing. Upon removal from the article, curing, or both, the formed and cut composite structure may relax or spring- back. To compensate for relaxation or spring-back of the formed and cut composite structure, the upper mold, lower mold, or both may be configured, structured, and/or arranged to form a shape slightly beyond the required contour of the formed and cut composite structure.
The article of the disclosure may further comprise any one or more of the features described in this specification in any combination, including the preferences and examples listed in this specification, and including the following features: a portion of the upper shearing edge and a portion of the lower shearing edge may be non-planar and may be adapted to form the non-planar cut; a portion of the upper shearing edge and a portion of the lower shearing edge may have non-planar and reciprocal contours; the upper mold may include a cavity adapted to receive or be received in a core of the lower mold which may then form at least a portion of the composite structure into a non-planar shape upon application of a die force; the cavity and the core may have non-planar and reciprocal contours; the upper pressure pad may include a lower pressure surface and the lower pressure pad may include an upper pressure surface; a lower pressure surface may face toward and may be in an opposing relationship to the upper pressure surface; a lower pressure surface may be adapted to apply a clamping force to an upper pressure surface so as to retain a composite material blank between the upper die and the lower die; the lower pressure surface may have a surface area about equal to a surface area of the upper pressure surface; the upper pressure pad may be rigidly affixed to the upper die; the lower mold may be rigidly affixed to the lower die; the lower pressure pad may be mounted to the lower die with one or more lower tension members; the one or more lower tension members may be one or more lower springs; the one or more lower tension members may maintain the lower pressure pad in an open position while in a preloaded state; the one or more lower tension members may be one or more nitrogen gas springs; the upper mold may be mounted to the upper die with one or more upper tension members; the one or more upper tension members may be one or more upper springs; the one or more upper tension members may be one or more nitrogen gas springs; the upper die may be adapted for movement relative to the lower die; movement of the upper die relative to the lower die may include movement towards and away from the lower die; movement towards and away from the lower die may be vertical movement; movement towards the lower die may be downward movement; movement away from the lower die may be upward movement; the article may be able to be placed into an open position to load a composite material blank into the article; in the open position the upper die may be distanced from the lower die so that the upper pressure pad and the upper mold may be distanced from and may not apply a force to the lower pressure pad and the lower mold; the article may be able to be placed into a clamping position in which the upper pressure pad and the lower pressure pad may apply pressure to sustain the composite material blank disposed therebetween within the article and the lower mold may be distanced from the upper mold so that the lower mold may not be received within the upper mold; upon a movement of the upper die toward the lower die from an open position to a clamping position, the upper pressure pad may move toward the lower pressure pad and may apply a clamping force to the composite material blank; the article may be able to be placed into a forming position in which a core of the lower mold may be at least partially received within a cavity of the upper mold, the upper pressure pad may apply a clamping force to the lower pressure pad, and the upper shearing surface may remain free from contact with the lower shearing surface; upon movement of the upper die toward the lower die from a clamping position to a forming position, a core of the lower mold may be at least partially received within a cavity of the upper mold to apply a forming force to the composite material blank and may form the composite material blank into a formed composite structure which may have at least a portion with a non-planar profile; the article may be able to be placed into a cutting position in which the core of the lower mold may be at least partially received within a cavity of the upper mold, and the upper shearing edge may be located beyond a lower shearing edge; upon movement of the upper die toward the lower die from a forming position to a cutting position, the upper shearing edge may pass the lower shearing edge to cut one or more edges of at least a portion of the formed composite structure with the non-planar cut; the article may be able to be placed into an open position to unload a formed and cut composite structure from the article, and in the open position the upper die may be distanced from the lower die so that the upper pressure pad and the upper mold may be distanced from and may not apply a force to the lower pressure pad and the lower mold; the upper die and the lower die may include a plurality of mating features; the mating features of the lower die may be adapted to receive the mating features of the upper die; the mating features of the lower die may be a plurality of alignment bushings; the mating features of the upper die may be a plurality of alignment pins; the lower die may include one or more mounts which may support the lower pressure pad; the lower die may include one or more pressure pad stopping features which may prevent the lower pressure pad from extending beyond a certain distance from the lower die when the upper die may not apply a force to the lower die; and the one or more pressure pad stopping features may be one or more stop pins.
The method of the disclosure may further comprise any one or more of the features described in this specification in any combination, including the preferences and examples listed in this specification, and including the following features: the method may include placing the composite material blank between the upper die and the lower die; the composite material blank may be placed between the upper die and the lower die when the article may be in an open position; placing the composite material blank may include resting the composite material blank on the lower pressure pad; clamping the composite material blank may include movement of the upper die toward the lower die from an open position to a clamping position so that the upper pressure pad may move toward the lower pressure pad and may apply a clamping force to the composite material blank; forming the composite material blank may include movement of the upper die toward the lower die from a clamping position to a forming position so that a core of the lower mold may be at least partially received within a cavity of the upper mold and may apply a forming force to the composite material blank and may mold the composite material blank into a formed composite structure with at least a portion being non-planar; the step of forming the composite material blank into the formed composite structure may include application of heat to the composite material blank; cutting the formed composite structure may include movement of the upper die toward the lower die from a final forming position to a cutting position so that an upper shearing edge may pass a lower shearing edge and may cut one or more edges of the composite material blank with the non-planar cut; the method may include opening the article which may include movement of the upper die away from the lower die from a cutting position to an open position which may allow for removal of a formed and cut composite structure; the method may include removing a formed and cut composite structure from the article; and the formed and cut composite structure may be removed from between the upper die and the lower die when the article may be in an open position.
The following descriptions of the Figures are provided to illustrate the teachings herein, but are not intended to limit the scope thereof
From the open position 200, the article 10 transitions to a clamping position 202 (as shown in
From the clamping position 202, the article transitions to a midway forming position 204 (as shown in
After the composite material blank 110 is fully formed into the formed composite structure 111, the article transitions from a forming position 206 to the cutting position 208 (as shown in
After the composite material blank 110 has been transformed into a formed and cut composite structure 113, the article 10 transitions back to the open position 200 (as seen in
Any numerical values recited in the above application include all values from the lower value to the upper value in increments of one unit provided that there is a separation of at least 2 units between any lower value and any higher value. These are only examples of what is specifically intended and all possible combinations of numerical values between the lowest value, and the highest value enumerated are to be considered to be expressly stated in this application in a similar manner. Unless otherwise stated, all ranges include both endpoints and all numbers between the endpoints. The term “consisting essentially of” to describe a combination shall include the elements, ingredients, components, or steps identified, and such other elements ingredients, components or steps that do not materially affect the basic and novel characteristics of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, ingredients, components, or steps herein also contemplates embodiments that consist essentially of the elements, ingredients, components, or steps.
Plural elements, ingredients, components, or steps can be provided by a single integrated element, ingredient, component, or step. Alternatively, a single integrated element, ingredient, component, or step might be divided into separate plural elements, ingredients, components, or steps. The disclosure of “a” or “one” to describe an element, ingredient, component, or step is not intended to foreclose additional elements, ingredients, components, or steps.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/US2017/057502 | 10/20/2017 | WO | 00 |
| Number | Date | Country | |
|---|---|---|---|
| 62411770 | Oct 2016 | US |
