Patent Grant
11951679
The present subject matter relates generally to an additive manufacturing apparatus, and more particularly to an additive manufacturing apparatus capable of forming larger components.
Additive manufacturing is a process in which material is built up layer-by-layer to form a component. Stereolithography (SLA) is a type of additive manufacturing process, which employs a tank of radiant-energy curable photopolymer “resin” and a curing energy source such as a laser. Similarly, Digital Light Processing (DLP) three-dimensional (3D) printing employs a two-dimensional image projector to build components one layer at a time. For each layer, the energy source draws or flashes a radiation image of the cross section of the component onto the surface of the resin. Exposure to the radiation cures and solidifies the pattern in the resin and joins it to a previously cured layer.
In some instances, additive manufacturing may be accomplished through a “tape casting” process. In this process, a resin is deposited onto a flexible radiotransparent resin support, such as a tape or foil, that is fed out from a feed reel to a build zone. Radiant energy is produced from a radiant energy device and directed through a window to cure the resin to a component that is supported by a stage in the build zone. Once the curing of the first layer is complete, the stage and the foil are separated from one another. The foil is then advanced and fresh resin is provided to the build zone. In turn, the first layer of the cured resin is placed onto the fresh resin and cured through the energy device to form an additional layer of the component. Subsequent layers are added to each previous layer until the component is completed.
Through the use of a tape casting process, various components are generally formed in a bottom-up manner leading to the formation of generally smaller components. However, it may be beneficial to form some larger parts through a tape casting process capable of forming a component in a top-down manner.
Aspects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned through practice of the invention.
In some embodiments of the present disclosure, an additive manufacturing apparatus includes a stage configured to hold a component formed by one or more layers of resin. A support plate is positioned above the stage. A radiant energy device is positioned above the stage. The radiant energy device is operable to generate and project energy in a predetermined pattern. A feed module is configured to operably couple with a first end portion of a resin support and is positioned upstream of the stage. A take-up module is configured to operably couple with a second end portion of the resin support and is positioned downstream of the stage.
In some embodiments of the present disclosure, method of operating an additive manufacturing apparatus includes depositing a layer of a resin onto a resin support. The method also includes translating the resin support to a position within a build zone. The resin is positioned below the resin support in a Z-axis direction while positioned within the build zone. The method further includes selectively curing the resin using an application of radiant energy from a radiant energy device to define a first cross-sectional layer of a component. Lastly, the method includes translating the resin support to a take-up module with a portion of the resin remaining on the resin support.
In some embodiments of the present disclosure, an additive manufacturing apparatus can include a stage configured to hold a component formed from one or more layers of a resin. A radiant energy device is operable to generate and project energy in a predetermined pattern. A support plate is at least partially positioned between the radiant energy device and the stage. A material depositor is configured to apply the resin on a resin support. The resin has a first viscosity. A viscosity modification assembly is configured to alter the first viscosity of the resin to a second viscosity.
These and other features, aspects, and advantages of the present disclosure will become better understood with reference to the following description and appended claims. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
A full and enabling disclosure of the present disclosure, including the best mode thereof, directed to one of ordinary skill in the art, is set forth in the specification, which makes reference to the appended figures.
Repeat use of reference characters in the present specification and drawings is intended to represent the same or analogous features or elements of the present disclosure.
Reference will now be made in detail to present embodiments of the invention, one or more examples of which are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention.
As used herein, the terms “first,” “second,” and “third” may be used interchangeably to distinguish one component from another and are not intended to signify a location or importance of the individual components. The terms “coupled,” “fixed,” “attached to,” and the like refer to both direct coupling, fixing, or attaching, as well as indirect coupling, fixing, or attaching through one or more intermediate components or features, unless otherwise specified herein. The terms “upstream” and “downstream” refer to the relative direction with respect to a resin support (such as a foil or tape) movement along the manufacturing apparatus. For example, “upstream” refers to the direction from which the resin support moves and “downstream” refers to the direction to which the resin support moves. The term “selectively” refers to a component's ability to operate in various states (e.g., an ON state and an OFF state, a first state and a second state, etc.) based on manual and/or automatic control of the component.
The singular forms “a,” “an,” and “the” include plural references unless the context clearly dictates otherwise.
Approximating language, as used herein throughout the specification and claims, is applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it is related. Accordingly, a value modified by a term or terms, such as “about,” “approximately,” “generally,” and “substantially,” is not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value, or the precision of the methods or apparatus for constructing or manufacturing the components and/or systems. For example, the approximating language may refer to being within a ten percent margin.
Moreover, the technology of the present application will be described in relation to exemplary embodiments. The word “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments. Additionally, unless specifically identified otherwise, all embodiments described herein should be considered exemplary. Other variations and implementations of the present disclosure will occur to those skilled in the art. Unless noted otherwise, like or corresponding elements among the figures may be indicated by like or corresponding reference numerals. Moreover, the drawings and illustrations in the present disclosure are generally not to scale and are not intended to correspond to actual relative dimensions.
Here and throughout the specification and claims, range limitations are combined, and interchanged, such ranges are identified and include all the sub-ranges contained therein unless context or language indicates otherwise. For example, all ranges disclosed herein are inclusive of the endpoints, and the endpoints are independently combinable with each other.
As used herein, the term “and/or,” when used in a list of two or more items, means that any one of the listed items can be employed by itself, or any combination of two or more of the listed items can be employed. For example, if a composition or assembly is described as containing components A, B, and/or C, the composition or assembly can contain A alone; B alone; C alone; A and B in combination; A and C in combination; B and C in combination; or A, B, and C in combination.
Furthermore, any arrangement of components to achieve the same functionality is effectively “associated” such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as “associated with” each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being “operably connected” or “operably coupled” to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being “operably couplable” to each other to achieve the desired functionality. Some examples of operably couplable include, but are not limited to, physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.
The present disclosure is generally directed to an additive manufacturing apparatus that implements various manufacturing processes such that successive layers of material(s) are provided on each other to “build-up,” layer-by-layer, a three-dimensional component. The successive layers generally cure together to form a monolithic component which may have a variety of integral sub-components. Although additive manufacturing technology is described herein as enabling the fabrication of complex objects by building objects point-by-point, layer-by-layer, variations of the described additive manufacturing apparatus and technology are possible and within the scope of the present subject matter.
The additive manufacturing apparatus can include a support plate, a window supported by the support plate, and a stage moveable relative to the window. In some examples, the additive manufacturing apparatus can further include a resin that is deposited as a layer having a desired thickness onto a resin support (e.g., foil, tape, or other resin support) that is fed out from a feed module. Radiant energy is used to cure the resin through the resin support. Once the curing of the first layer is complete, the stage is retracted, taking the cured material with it. In some instances, the support plate may be positioned above the stage and the stage may move downwardly as the component is built in a layer-by-layer manner. The resin support is then advanced to expose a fresh clean section, ready for additional resin to be deposited in a subsequent, new cycle.
In operation, the resin is provided in an inverted position in which the resin is below the resin support. As such, the resin may be configured to adhere to the tape without dripping. Thus, the resin may be viscous, have a chemical adhesion to the resin support, and/or be precured so that the resin sticks to the resin support. Through an inverted process, larger components may be additively manufactured.
Referring to the drawings wherein identical reference numerals denote the similar elements throughout the various views,
In the illustrated example, the apparatus 10 includes a feed module 22, which may include a first roller 22A, and a take-up module 24, which may include a second roller 24A, that are spaced-apart with a flexible tape or resin support 26 or another type of resin R support extending therebetween. Suitable mechanical supports (frames, brackets, etc.) may be provided for the rollers 22A, 24A and the support plate 14. The first roller 22A and/or the second roller 24A can be configured to control the speed and direction of the resin support 26 such that the desired tension and speed is maintained in the resin support 26 through a drive system 28. By way of example and not limitation, the drive system 28 can be configured as individual motors associated with the first roller 22A and/or the second roller 24A. Moreover, various components, such as motors, actuators, feedback sensors, and/or controls can be provided for driving the rollers 22A, 24A in such a manner so as to maintain the resin support 26 tensioned between the rollers 22A, 24A and to wind the resin support 26 from the first roller 22A to the second roller 24A. In other examples, the resin support 26 may be configured as a belt that translates one or more plates between the feed module 22 and the take-up module 24. Each plate may be configured to hold a layer of resin R.
In various embodiments, the window 16 is transparent and can be operably supported by the support plate 14. Further, the window 16 and the support plate 14 can be integrally formed such that one or more windows 16 are integrated within the support plate 14. Likewise, the resin support 26 is also transparent or includes transparent portions. As used herein, the terms “transparent” and “radiotransparent” refer to a material that allows at least a portion of radiant energy of a selected wavelength to pass through. For example, the radiant energy that passes through the window 16 and the resin support 26 can be in the ultraviolet spectrum, the infrared spectrum, the visible spectrum, or any other practicable radiant energy. Non-limiting examples of transparent materials include polymers, glass, and crystalline minerals, such as sapphire or quartz.
The resin support 26 extends between the feed module 22 and the take-up module 24 and defines a resin surface 30 that faces the stage 18 with the window 16 on an opposing side of the resin support 26 from the stage 18. For purposes of convenient description, when aligned with the stage 18, the resin surface 30 may be considered to be oriented parallel to an X-Y plane of the apparatus 10, and a direction perpendicular to the X-Y plane is denoted as a Z-axis direction (X, Y, and Z being three mutually perpendicular directions). As used herein, the X-axis refers to the machine direction along the length of the resin support 26. As used herein, the Y-axis refers to the transverse direction across the width of the resin support 26 and generally perpendicular to the machine direction. As used herein, the Z-axis refers to the stage direction that can be defined as the direction of movement of the stage 18 relative to the window 16.
For reference purposes, an area or volume immediately surrounding the location of the resin support 26 and the window 16 or transparent portion defined by the support plate 14 may be defined as a “build zone,” labeled 32.
In some instances, a material depositor 34 may be positioned along the resin support 26. The material depositor 34 may be any device or combination of devices that is operable to apply a layer of resin R on the resin support 26. The material depositor 34 may optionally include a device or combination of devices to define a height of the resin R on the resin support 26 and/or to level the resin R on the resin support 26. Nonlimiting examples of suitable material deposition devices include chutes, hoppers, pumps, spray nozzles, spray bars, or printheads (e.g. inkjets). In some examples, a doctor blade may be used to control the thickness of resin R applied to the resin support 26 as the resin support 26 passes the material depositor 34.
The resin R includes any radiant-energy curable material, which is capable of adhering or binding together the filler (if used) in the cured state. As used herein, the term “radiant-energy curable” refers to any material which solidifies or partially solidifies in response to the application of radiant energy of a particular frequency and energy level. For example, the resin R may include a photopolymer resin containing photo-initiator compounds functioning to trigger a polymerization reaction, causing the resin R to change from a liquid (or powdered) state to a solid state. Alternatively, the resin R may include a material that contains a solvent that may be evaporated out by the application of radiant energy. The uncured resin R may be provided in solid (e.g. granular) or liquid form, including a paste or slurry.
Furthermore, the resin R can have a relatively high viscosity that will not “slump” or run off during the build process. The composition of the resin R may be selected as desired to suit a particular application. Mixtures of different compositions may be used. The resin R may be selected to have the ability to out-gas or burn off during further processing, such as a sintering process.
Additionally or alternatively, the resin R may be selected to be a viscosity reducible composition. These compositions reduce in viscosity when a shear stress is applied or when they are heated. For example, the resin R may be selected to be shear-thinning such that the resin R exhibits reduced viscosity as an amount of stress applied to the resin R increases. Additionally or alternatively, the resin R may be selected to reduce in the viscosity as the resin R is heated.
The resin R may incorporate a filler. The filler may be pre-mixed with resin R, then loaded into the material depositor 34. The filler includes particles, which are conventionally defined as “a very small bit of matter.” The filler may include any material that is chemically and physically compatible with the selected resin R. The particles may be regular or irregular in shape, may be uniform or non-uniform in size, and may have variable aspect ratios. For example, the particles may take the form of powder, of small spheres or granules, or may be shaped like small rods or fibers.
The composition of the filler, including its chemistry and microstructure, may be selected as desired to suit a particular application. For example, the filler may be metallic, ceramic, polymeric, and/or organic. Other examples of potential fillers include diamond, silicon, and graphite. Mixtures of different compositions may be used. In some examples, the filler composition may be selected for its electrical or electromagnetic properties, e.g. it may specifically be an electrical insulator, a dielectric material, an electrical conductor, and/or magnetic.
The filler may be “fusible,” meaning it is capable of consolidation into a mass upon via application of sufficient energy. For example, fusibility is a characteristic of many available powders including but not limited to polymeric, ceramic, glass, and metallic. The proportion of filler to resin R may be selected to suit a particular application. Generally, any amount of filler may be used so long as the combined material is capable of flowing and being leveled, and there is sufficient resin R to hold together the particles of the filler in the cured state. Moreover, the filler may be used to obtain a predetermined viscosity of the resin R such that the resin R maintains its position and thickness on the resin support 26.
The stage 18 is a structure defining a planar surface 36, which is capable of being oriented parallel to the resin surface 30 or the X-Y plane. Various devices may be provided for moving the stage 18 relative to the window 16 parallel to the Z-axis direction. For example, as illustrated in
The radiant energy device 20 may be configured as any device or combination of devices operable to generate and project radiant energy at the resin R in a suitable pattern and with a suitable energy level and other operating characteristics to cure the resin R during the build process. For example, as shown in
The image forming apparatus 52 may include one or more mirrors, prisms, and/or lenses and is provided with suitable actuators, and arranged so that the source beam 54 from the radiant energy source 50 can be transformed into a pixelated image 78 in an X-Y plane coincident with the surface of the resin R. In the illustrated example, the image forming apparatus 52 may be a digital micro-mirror device.
The projector 48 may incorporate additional components, such as actuators, mirrors, etc. configured to selectively move the image forming apparatus 52 or other part of the projector 48 with the effect of rastering or shifting the location of the patterned image 78 on the resin surface 30. Stated another way, the patterned image 78 may be moved away from a nominal or starting location.
In addition to other types of radiant energy devices 20, the radiant energy device 20 may include a “scanned beam apparatus” used herein to refer generally to any device operable to generate a radiant energy beam of suitable energy level and other operating characteristics to cure the resin R and to scan the beam over the surface of the resin R in a desired pattern. For example, the scanned beam apparatus can include a radiant energy source 50 and a beam steering apparatus. The radiant energy source 50 may include any device operable to generate a beam of suitable power and other operating characteristics to cure the resin R. Non-limiting examples of suitable radiant energy sources 50 include lasers or electron beam guns.
The apparatus 10 may be operably coupled with a computing system 60. The computing system 60 in
Optionally, the components of the apparatus 10 may be surrounded by a housing 62, which may be used to provide a shielding or inert gas (e.g., a “process gas”) atmosphere using gas ports 64. Optionally, pressure within the housing 62 could be maintained at a desired level greater than or less than atmospheric. Optionally, the housing 62 could be temperature and/or humidity controlled. Optionally, ventilation of the housing 62 could be controlled based on factors such as a time interval, temperature, humidity, and/or chemical species concentration. In some embodiments, the housing 62 can be maintained at a pressure that is different than an atmospheric pressure.
Referring to
In the embodiment of
In some examples, the material depositor 34 may be positioned downstream of the feed module 22 and at least partially upstream of a pivot device 70 configured to alter a relationship of the resin relative to the resin support 26 in a Z-axis direction such that the resin R is deposited on the resin support 26 upstream of at least one of the pivot devices 70 such that gravity may assist in depositing the resin R on the resin support 26. The resin R may then be translated about the at least one of the pivot device 70 and into the build zone 32 on an opposing side of the support plate 14. As such, the resin R may be deposited on the first surface 72 when the first surface 72 is an upward or upper surface of the resin support 26 that becomes a bottom, inverted surface once the resin R is translated about the at least one of the pivot device 70. As used herein, “inverted” is any component or material that is positioned below a surface supporting the component or material in the Z-axis direction.
In some examples, a first portion 80 of the resin support 26 upstream of one or more pivot devices 70 and a second portion 82 of the resin support 26 downstream of the one or more pivot devices 70. A first segment 84 of the resin R may be supported by the first portion 80 of the resin support 26 while a second segment 86 of resin R may be supported by the second portion 82 of the resin support 26. The second segment of resin R may be any portion of the resin R that is angularly offset from the first segment 84 of resin R in any direction. In various instances, the second segment 86 of the resin R may be inverted and extend a length that is greater than a length of the stage 18 in the X-axis direction. In various embodiments, the resin R may be inverted for a predefined amount of time in which the resin R is capable of maintaining its position on the resin support 26 while being inverted. For example, the resin R may be configured to maintain its inverted position for a minimum amount of time of 10 seconds, 30 seconds, 60 seconds, and/or any other predefined amount of time.
With reference to
In some embodiments, the viscosity modification assembly 66 may be configured to mechanically vibrate a portion of the support plate 14 and/or the window to create a shearing stress on the resin R. For example, the viscosity modification assembly 66 may include a movement device 114 (e.g., a transducer) that is operably coupled with the support plate 14, the window, or any other module of the apparatus 10 that is then transferred to the resin R. The movement device 114 may be configured to vibrate at least a portion of the support plate 14, the window, or any other module of the apparatus 10 that is then transferred to the resin R. Additionally and/or alternatively, the movement device 114 may be configured to convert electrical energy to ultrasonic mechanical pressure waves that are transferred to the resin R. For instance, the movement device 114 may be in the form of an ultrasonic vibrating device, such as one utilizing a piezoelectric transducer. In other embodiments, the viscosity modification assembly 66, in addition to or in lieu of the transducer, may include, alone or in conjunction with one or the other, a fluid, an acoustic, a motor (e.g., offset cam), a reciprocating piston, or any other movement device 114.
The movement device 114 may be operably coupled with a control system 116 that may be further coupled and/or integrated within the computing system 60. The control system 116 may include a signal generator 118 that supplies an electric impulse to the movement device 114, the voltage of which can be varied at different frequencies and with different waveshapes. The signal may, for example, be a pure sinusoidal wave or may be modulated with one or more other frequencies. Alternatively, the signal may be a stepped or spiked pulse. In some embodiments, the signal generator 118 transmits a signal of between 20-80 kHz. For example, the signal is at about 60 kHz. The signal generator 118 may, for example, transmit a constant amplitude signal at a constant frequency, or alternate one or both of these parameters. A power level can be selected as a percentage of maximum power.
In other embodiments, the viscosity modification assembly 66 may be configured to create a shearing stress on the resin R through other configurations without departing from the scope of the present disclosure. For example, the viscosity modification assembly 66 may be configured as a probe that may be adjacent and in physical contact with the resin support 26, the resin on the resin support 26, and/or any other module that may relay the shearing stress to the resin R on the resin support 26. Additionally or alternatively, the viscosity modification assembly 66 may be configured as an ultrasonic or vibration plate that may be operably coupled with the resin support 26 and/or any other module of the apparatus 10 that may provide the shearing stress to the resin R on the resin support 26.
It will be appreciated that the operations (e.g., amount of shear thinning) of the viscosity modification assembly 66 may be adjusted based on the design of the apparatus 10 such that the shear thinning may be configured to not interfere with the component 12 and/or the build process. For example, if the shear thinning is too aggressive, it may be possible that the resin may fall off the resin support 26 in the inverted position. As such, the viscosity modification assembly 66 may be utilized with predefined resins, part geometries, parameter sets, and so on.
With further reference to
Moreover, in various embodiments, the viscosity modification assembly 66 may be configured to target specific locations in the build zone 32. As such, by taking advantage of constructive and destructive wave interference vibration caused by the viscosity modification assembly 66, the apparatus 10 can target specific locations within the build zone 32. In such instances, the gasket 120 may assist in separating the specific locations in the build zone 32.
As provided herein, in some instances, the viscosity modification assembly 66 may additionally or alternatively be capable of producing heat to alter the viscosity of the resin R. For example, fast heating processes, such as dielectric or microwave heating, can be used to avoid exposing the resin R to a long heating cycle before the temperature of use is reached.
In some embodiments, the viscosity modification assembly 66 may be integrated within and/or operably coupled with the stage 18 such that the printed component 12 itself can induce the shearing stress in the resin R to cause the viscosity of the resin R change.
Referring to
In the embodiment of
In some examples, the material depositor 34 may be positioned on an opposite side of the support plate 14 from the stage 18 such that the resin R is deposited on the resin support 26 upstream of the pivot device 70 such that gravity may assist in depositing the resin R on the resin support 26. The resin R may then be translated about the pivot device 70 and into the build zone 32 on an opposing side of the support plate 14. As such, the resin R may be deposited on the first surface 72 when the first surface 72 is an upward or upper surface of the resin support 26 that becomes a bottom, inverted surface once the resin R is translated about the pivot device 70.
In various embodiments, the resin R may be inverted between the pivot device 70 and the take-up module 24. Once the resin R is inverted and positioned within the build zone 32, a working surface of the stage 18 and/or the component 12 retained by the stage 18 contacts the resin R to define a selected layer increment. The layer increment is defined by some combination of the thickness of the deposited resin R and the operation of the stage 18. For example, the stage 18 could be positioned such that the stage 18 for new components 12 or the existing surface for components 12 in process is just touching the deposited resin R or the stage 18 could be used to compress and displace the resin R to positively define the layer increment. The layer increment affects the speed of the additive manufacturing process and the resolution of the component 12. The layer increment can be variable, with a larger layer increment being used to speed the process in portions of the component 12 not requiring high accuracy, and a smaller layer increment being used where higher accuracy is required, at the expense of process speed.
The patterned image may be transmitted through the window 16 supported by the support plate 14 with the window 16 positioned below the radiant energy device 20. As each layer 68 of the component 12 is cured, the stage 18 may be further lowered such that a component 12 is formed in a top-down manner. It will be appreciated that in some embodiments, in addition to or in lieu of the stage movement, the support plate 14 and the resin support 26 may be translated up in the Z-axis direction.
In some examples, the radiant energy device 20 may be positioned between a first portion 80 of the resin support 26 upstream of the pivot device 70 and a second portion 82 of the resin support 26 downstream of the pivot device 70. A first segment 84 of resin R may be supported by the first portion 80 of the resin support 26 while a second segment 86 of resin R may be supported by the second portion 82 of the resin support 26. The second segment of resin R may be any portion of the resin R that is angularly offset from the first segment 84 of resin R in any direction. In various instances, the second segment 86 of the resin R may be inverted and extend a length that is greater than a length of the stage 18 in the X-axis direction. For example, the second segment 86 of the resin R may be inverted for a distance of 0.5 feet, 1 foot, 2 feet, 5 feet, 10 feet, 50 feet, 75 feet, 100 feet, or any other distance.
In various embodiments, the resin R may be inverted for a predefined amount of time in which the resin R is capable of maintaining its position on the resin support 26 while being inverted. For example, the resin R may be configured to maintain its inverted position for a minimum amount of time of 10 seconds, 30 seconds, 60 seconds, and/or any other predefined amount of time.
In some embodiments, a precuring assembly 88 may be at least partially upstream of the pivot device 70 and/or in any other location along the resin support 26. The precuring assembly 88 may be configured to at least partially cure the resin R prior to the resin R being translated about the pivot device 70. For example, the precuring assembly 88 may include a gross radiation source 90 that alters the resin R from a first state to a second state that alters a characteristic, such as the viscosity, or the resin R so that the resin R may not drip while being in the inverted position. Additionally or alternatively, the resin R may have a chemical adhesion to the resin support 26 so that the resin R sticks to the tape.
In various examples, the precuring assembly 88 may pre-cure the resin from the top (e.g., a position on the first side of the resin support) or pre-cure from a bottom (e.g., a position on an opposing, second side of the resin support). In various instances, if the resin is pre-cured from the bottom, an adhesion of the resin to the resin support 26 may be increased.
Referring to
In the exemplary embodiment illustrated in
As illustrated in
In the embodiment illustrated in
Referring to
Referring to
In some embodiments, the material depositor 34 is positioned downstream of the first roller 22A and upstream of the stage 18. The material depositor 34 may further be positioned below the resin support 26 in the Z-axis direction. The material depositor 34 may include a transfer roller that is configured to apply the resin R to the resin support 26 upstream of the stage 18. The transfer roller is configured to deposit a resin R to the first surface 72 of the resin support 26 through any practicable manner as the resin support 26 is translated.
With further reference to
In some examples, the pneumatic actuation zones 98 may be fluidly coupled with a pneumatic assembly 100 through various hoses and one or more ports. The pneumatic assembly 100 may include any device capable of providing a vacuum/suction and/or pushing a fluid, such as air or a process gas (e.g., nitrogen or argon), through the one or more pneumatic actuation zones 98. For instance, the pneumatic assembly 100 may include a pressurized fluid source that includes a compressor and/or a blower. The pneumatic assembly 100 may additionally or alternatively include any assembly capable of altering a pressure, such as a venturi vacuum pump. In some embodiments, one or more valves and/or switches may be coupled with the pneumatic assembly 100 and the one or more pneumatic actuation zones 98. The one or more valves and/or switches are configured to regulate a pressure to each of the one or more pneumatic actuation zones 98.
In various embodiments, the one or more pneumatic actuation zones 98 may define one or more apertures 102 of any size and shape for interacting with the resin support 26. For instance, the apertures 102 may be any number and combination of holes, slits, or other geometric shapes defined by any component of the additive manufacturing apparatus 10, such as a casing of the resin support interaction device 96. Additionally or alternatively, the apertures 102 may be defined by a portion of the casing being formed from a porous material, or through any other assembly in which a fluid may be moved from a first side of the casing to a second side of the casing to interact with the resin support 26.
In some instances, the one or more pneumatic actuation zones 98 may extend along various portions of the support plate. Further, in some instances, the one or more pneumatic actuation zones 98 may extend along substantially all of the support plate 14. In operation, the one or more pneumatic actuation zones 98 may keep and/or at least partially prevent gravity from stretching the resin support 26 away from the support plate 14 and/or the window 16 beyond a predefined amount.
Now that the construction and configuration of the additive manufacturing apparatus 10 has been described according to various examples of the present subject matter, a method 200 for operating an additive manufacturing apparatus 10 is provided in conjunction with illustrations of the various steps in
Referring now to
With further reference to
As illustrated in
As illustrated in
Once the component 12 and the uncured resin R are separated, the method 200, at step 220, can include translating the resin support 26 to a take-up module 24 with a portion of the resin R remaining on the resin support 26. During translation of the resin support 26, resin R is deposited on the resin support 26 with the newly deposited resin R being translated into the build zone 32 and the stage 18 may be moved towards the resin R.
As illustrated in
Referring now to
Referring to
With further reference to
In several embodiments, at step 308, the method 300 may include altering a viscosity of the resin from a first viscosity to a second viscosity. The viscosity may be altered while the foil is being translated and/or after the foil has been translated and becomes stationary. As provided herein, the viscosity modification assembly 66 may be configured to apply a shearing stress to the resin R to alter the viscosity of the resin from the first viscosity to the second viscosity. In various instances, the second viscosity may be less than the first viscosity. Additionally or alternatively, the viscosity modification assembly 66 may be configured to heat (or cool) the resin to alter the viscosity of the resin from the first viscosity to the second viscosity.
In some embodiments, at step 310, the method 300 can further include applying a pressure from a resin support interaction device 96 onto the resin support 26. The pressure may be a negative pressure in which the resin support 26 is suctioned towards the support plate 14. Additionally, or alternatively, the pressure may be a positive pressure that may be used to detach the resin support 26 from the support plate 14 and/or reduce a frictional coefficient during movement of the resin support 26 along the support plate 14.
As illustrated in
As illustrated in
Once the component 12 and the uncured resin R are separated, the method 300, at step 322, can include translating the resin support 26 to a take-up module 24 with a portion of the resin R remaining on the resin support 26.
As generally illustrated in
At step 326, the method 300 can include curing a second portion of the resin R by applying radiant energy from a radiant energy device 20 through the window 16 and the resin support 26. Curing the second portion can further include, at step 328, emitting a second patterned image 78 from the radiant energy device 20 that is transmitted through the window 16. It will be appreciated that the second patterned image 78 may be different and/or generally similar to that of the first patterned image 78.
As illustrated in
As provided herein, the radiant energy source may emit discrete patterned images 78 with movement of the radiant energy device 20, the resin support 26, and/or the stage 18 between each patterned image 78 that may be stitched to create the predefined geometry of the layer 68 of the component 12 by combining multiple radiant energy beams or patterns of suitable energy level with overlapping fields of view to produce a high-resolution image. Additionally or alternatively, the radiant energy device 20 may be capable of performing a scanning process in which the consecutive patterned images 78 are emitted from the radiant energy device 20 as the radiant energy device 20 is translated along the movement assembly 92.
After the third portion of the resin R is cured, the layer 68 of the component 12 may be completed. The method 300 provided herein may then repeated for each additional layer 68 until the component 12 is complete.
The memory device(s) 60C can include one or more computer-readable media and can store information accessible by the one or more processor(s) 60B, including instructions 60D that can be executed by the one or more processor(s) 60B. The instructions 60D may include one or more steps of the methods 200, 300 described above, such as to execute operations of the actuator assembly 38, the drive system 28, the movement assembly 92, and/or the radiant energy device 20 of the additive manufacturing apparatus 10 described above. For instance, the memory device(s) 60C can store instructions 60D for running one or more software applications, displaying a user interface, receiving user input, processing user input, etc. In some implementations, the instructions 60D can be executed by the one or more processor(s) 60B to cause the one or more processor(s) 60B to perform operations, e.g., such as one or more portions of methods described herein. The instructions 60D can be software written in any suitable programming language or can be implemented in hardware. Additionally, and/or alternatively, the instructions 60D can be executed in logically and/or virtually separate threads on processor(s) 60B.
The one or more memory device(s) 60C can also store data 60E that can be retrieved, manipulated, created, or stored by the one or more processor(s) 60B. The data 60E can include, for instance, data to facilitate performance of the methods 200, 300 described herein. The data 60E can be stored in one or more database(s). The one or more database(s) can be connected to computing system 60 by a high bandwidth LAN or WAN or can also be connected to the computing system 60 through network(s) (not shown). The one or more database(s) can be split up so that they are located in multiple locales. In some implementations, the data 60E can be received from another device.
The computing system(s) 60 can also include a communication module or interface 60F used to communicate with one or more other component(s) of computing system 60 or the additive manufacturing apparatus 10 over the network(s). The communication interface 60F can include any suitable components for interfacing with one or more network(s), including, for example, transmitters, receivers, ports, controllers, antennas, or other suitable components.
As provided herein, the computing system 60 may be operably coupled with one or more of the actuator assembly 38, the drive system 28, the movement assembly 92, and/or the radiant energy device 20. The computing system 60 may be operably coupled with the movement assembly 92 to place the radiant energy device 20 in one or more positions. Various sensors 110 may be provided for detecting information related to movement of the stage 18, the resin support 26 and/or the radiant energy device 20. The information may be provided to the computing system 60, which, in turn, can alter a movement characteristic of the stage 18, the resin support 26, and/or the radiant energy device 20 in order to maintain a locus of the components relative to one another.
It should be appreciated that the additive manufacturing apparatus is described herein only for the purpose of explaining aspects of the present subject matter. In other example embodiments, the additive manufacturing apparatus may have any other suitable configuration and may use any other suitable additive manufacturing technology. Further, the additive manufacturing apparatus and processes or methods described herein may be used for forming components using any suitable material. For example, the material may be plastic, metal, concrete, ceramic, polymer, epoxy, photopolymer resin, or any other suitable material that may be embodied in a layer of slurry, resin, or any other suitable form of sheet material having any suitable consistency, viscosity, or material properties. For example, according to various embodiments of the present subject matter, the additively manufactured components described herein may be formed in part, in whole, or in some combination of materials including but not limited to pure metals, nickel alloys, chrome alloys, titanium, titanium alloys, magnesium, magnesium alloys, aluminum, aluminum alloys, iron, iron alloys, stainless steel, and nickel or cobalt based superalloys (e.g., those available under the name Inconel® available from Special Metals Corporation). These materials are examples of materials suitable for use in the additive manufacturing processes described herein and may be generally referred to as “additive materials.”
Aspects of the invention(s) are provided by the subject matter of the following clauses, which are intended to cover all suitable combinations unless dictated otherwise based on logic or the context of the clauses and/or associated figures and description:
An additive manufacturing apparatus comprising: a stage configured to hold a component formed by one or more layers of resin; a support plate positioned above the stage; a radiant energy device positioned above the stage, the radiant energy device operable to generate and project energy in a predetermined pattern; a feed module configured to operably couple with a first end portion of a resin support and positioned upstream of the stage; and a take-up module configured to operably couple with a second end portion of the resin support and positioned downstream of the stage.
The additive manufacturing apparatus of one or more of these clauses, further comprising: an actuator configured to change a relative position of the stage and the resin support.
The additive manufacturing apparatus of one or more of these clauses, wherein the actuator is operably coupled with the stage and configured to increase a distance between the resin support and the stage.
The additive manufacturing apparatus of one or more of these clauses, wherein the actuator is operably coupled with the support plate and configured to increase a distance between the support plate and the stage.
The additive manufacturing apparatus of one or more of these clauses, further comprising: a pivot device configured to alter an orientation of the resin support such that the resin is alternated from an upward orientation in which the resin is above the resin support in a Z-axis direction upstream of the pivot device to an inverted orientation in which the resin is below the resin support in the Z-axis direction downstream of the pivot device.
The additive manufacturing apparatus of one or more of these clauses, further comprising: a material depositor positioned downstream of the feed module and at least partially upstream of a pivot device configured to alter a relationship of the resin relative to the resin support in a Z-axis direction.
The additive manufacturing apparatus of one or more of these clauses, further comprising: a material depositor is positioned below the resin support in a Z-axis direction.
The additive manufacturing apparatus of one or more of these clauses, further comprising: a material depositor is upstream of a pivot device, the material depositor configured to deposit the resin on the resin support when the resin support is non-parallel to an X-axis direction.
The additive manufacturing apparatus of one or more of these clauses, wherein the material depositor is configured to apply a layer of the resin to a first portion of the resin support with the resin support in a generally perpendicular position relative to a second portion of the resin support positioned between the stage and the radiant energy device.
The additive manufacturing apparatus of one or more of these clauses, further comprising: a precuring device configured to project radiant energy at the resin on the resin support upstream of the stage.
The additive manufacturing apparatus of one or more of these clauses, wherein the resin is maintained in an inverted position in which the resin support is positioned above the resin while the stage is below the resin, and wherein a portion of the resin maintains the inverted position as the resin support is translated to the take-up module.
A method of operating an additive manufacturing apparatus, the method comprising: depositing a layer of a resin onto a resin support; translating the resin support to a position within a build zone, wherein the resin is positioned below the resin support in a Z-axis direction while positioned within the build zone; selectively curing the resin using an application of radiant energy from a radiant energy device to define a first cross-sectional layer of a component; and translating the resin support to a take-up module with a portion of the resin remaining on the resin support.
The method of one or more of these clauses, further comprising: lowering a stage supporting the component in the Z-axis direction to increase a separation distance between a support plate and the stage.
The method of one or more of these clauses, further comprising: raising a support plate in the Z-axis direction to increase a separation distance between a support plate and a stage supporting the component.
The method of one or more of these clauses, further comprising: precuring at least a portion of the resin prior to being inverted.
The method of one or more of these clauses, further comprising: moving at least one of the radiant energy device or a support plate in an X-axis direction or a Y-axis direction prior to an additional step of selectively curing the resin using the application of radiant energy from the radiant energy device to define a second cross-sectional layer of the component.
An additive manufacturing apparatus comprising: a stage configured to hold a component formed from one or more layers of a resin; a radiant energy device operable to generate and project energy in a predetermined pattern; a support plate at least partially positioned between the radiant energy device and the stage; a material depositor configured to apply the resin on a resin support, the resin having a first viscosity; and a viscosity modification assembly configured to alter the first viscosity of the resin to a second viscosity.
The additive manufacturing apparatus of one or more of these clauses, wherein the material depositor is configured as a transfer roller positioned below the resin support and configured to apply the resin to the resin support upstream of the stage.
The additive manufacturing apparatus of one or more of these clauses, wherein the viscosity modification assembly is configured to alter the first viscosity of the resin to the second viscosity by applying a shear stress to the resin.
The additive manufacturing apparatus of one or more of these clauses, wherein the shear stress is applied to the resin prior to the radiant energy device projecting energy in a predetermined pattern onto the resin.
This written description uses examples to disclose the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including making and using any devices or systems and performing any incorporated methods. The patentable scope of the invention is defined by the claims, and may include other examples that occur to those skilled in the art. Such other examples are intended to be within the scope of the claims if they include structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims. Moreover, it will be appreciated that the phrase “configured to” or “adapted to” denotes an actual state of configuration that fundamentally ties at least one component described herein to the physical characteristics of the component preceding the phrase “configured to” or “adapted to”.
The present application claims priority to U.S. Provisional Patent Application Ser. No. 63/211,069, filed on Jun. 16, 2021, the contents of which of which are hereby incorporated by reference in their entirety.
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