Patent Application
20190111621
Embodiments of the disclosure generally relate to an additive manufacturing apparatus. More particularly, embodiments of the disclosure relate to an additive manufacturing apparatus including compact and integrated build units.
Powder bed technologies are some examples of additive manufacturing processes. However, in powder bed technology, as the build takes place in the powder bed, conventional additive manufacturing systems may use a large amount of powder. This may be cost-prohibitive when considering a factory environment using many such systems. The powder that is not directly melted into the part but stored in the neighboring powder beds may be problematic because it may add weight to the piston systems, complicate seals and chamber pressure problems, and the possibility of contamination may increase. Further, some powders required for builds may be scarce and in low quantities.
Accordingly, there remains a need for an additive manufacturing apparatus that allows for minimization of powder usage and wastage in the additive manufacturing apparatus.
In one aspect, the disclosure relates to an additive manufacturing apparatus including a build module. The build module includes a support structure and an integrated build unit formed in the support structure. The integrated build unit includes a chamber: a powder supply compartment comprising a powder material, formed in the chamber; and a build compartment comprising a build platform, formed in the chamber adjacent to the powder supply compartment. A separator is disposed between the powder supply compartment and the build compartment.
In another aspect, the disclosure relates to an additive manufacturing apparatus including a plurality of build modules. Each build module of the plurality of modules includes a support structure and an integrated build unit formed in the support structure. The integrated build unit includes a chamber. The chamber includes a powder supply compartment, formed in the chamber; and a build compartment, formed in the chamber adjacent to the powder supply compartment. A separator is disposed between the powder supply compartment and the build compartment. The powder supply compartment includes a powder material and the build compartment includes a build platform.
These and other features, embodiments, and advantages of the present disclosure may be understood more readily by reference to the following detailed description.
These and other features, aspects, and advantages of the present disclosure will become better understood when the following detailed description is read with reference to the accompanying drawings, wherein:
In the following specification and the claims, which follow, reference will be made to a number of terms, which shall be defined to have the following meanings. The singular forms “a”, “an” and “the” include plural referents unless the context clearly dictates otherwise. As used herein, the term “or” is not meant to be exclusive and refers to at least one of the referenced components being present and includes instances in which a combination of the referenced components may be present, unless the context clearly dictates otherwise.
Approximating language, as used herein throughout the specification and claims, may be 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 solidified by a term or terms, such as “about”, and “substantially” is not to be limited to the precise value specified. In some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Similarly, “free” may be used in combination with a term, and may include an insubstantial number, or trace amounts, while still being considered free of the solidified term. Here and throughout the specification and claims, range limitations may be combined and/or interchanged, such ranges are identified and include all the sub-ranges contained therein unless context or language indicates otherwise.
As mentioned earlier, conventional additive manufacturing processes may result in increased powder usage and wastage. The methods described herein address the noted shortcomings in conventional additive manufacturing apparatus, at least in part, through incorporating a powder supply compartment immediately next to a build platform in a small compact arrangement.
In some embodiments, an additive manufacturing apparatus is presented. The additive manufacturing apparatus includes a build module. The build module includes a support structure and an integrated build unit formed in the support structure. The integrated build unit includes a chamber; a powder supply compartment comprising a powder material, formed in the chamber; and a build compartment comprising a build platform, formed in the chamber adjacent to the powder supply compartment. A separator is disposed between the powder supply compartment and the build compartment.
According to the embodiments described herein, the additive manufacturing apparatus is capable of forming a desired object or structure using an additive manufacturing process. “Additive manufacturing” is a term used herein to describe a process which involves layer-by-layer construction or additive fabrication (as opposed to material removal as with conventional machining processes). Such processes may also be referred to as “rapid manufacturing processes”. The additive manufacturing process forms net or near-net shape structures through sequentially and repeatedly depositing and joining material layers. As used herein the term “near-net shape” means that the additively manufactured structure is formed very close to the final shape of the structure, not requiring significant traditional mechanical finishing techniques, such as machining or grinding following the additive manufacturing process. Additive manufacturing systems and methods include, for example, and without limitation, vat photopolymerization, powder bed fusion, binder jetting, material jetting, sheet lamination, material extrusion, directed energy deposition and hybrid systems. These systems and methods may include, for example, and without limitation, stereolithography; digital light processing; scan, spin, and selectively photocure; continuous liquid interface production; selective laser sintering; direct metal laser sintering; selective laser melting; electron beam melting; selective heat sintering; multi-jet fusion; smooth curvatures printing; multi-jet modeling; laminated object manufacture; selective deposition lamination; ultrasonic additive manufacturing; fused filament fabrication; fused deposition modeling; laser metal deposition; laser engineered net shaping; direct metal deposition; hybrid systems; and combinations of these methods and systems. These methods and systems may employ, for example, and without limitation, all forms of electromagnetic radiation, heating, sintering, melting, curing, binding, consolidating, pressing, embedding, and combinations thereof.
These methods and systems employ materials including, for example, and without limitation, polymers, plastics, metals, ceramics, sand, glass, waxes, fibers, biological matter, composites, and hybrids of these materials. These materials may be used in these methods and systems in a variety of forms as appropriate for a given material and method or system, including for example without limitation, liquids, solids, powders, sheets, foils, tapes, filaments, pellets, liquids, slurries, wires, atomized, pastes, and combinations of these forms.
In certain embodiments, suitable additive manufacturing processes include, but are not limited to, the processes known to those of ordinary skill in the art as direct metal laser melting (DMLM), direct metal laser sintering (DMLS), direct metal laser deposition (DMLD), laser engineered net shaping (LENS), selective laser sintering (SLS), selective laser melting (SLM), electron beam melting (EBM), fused deposition modeling (FDM), binder jet technology, or combinations thereof.
The support structure 120 further includes an integrated build unit 130 formed in the support structure 120. The term “integrated build unit” as used herein refers to a build unit including the powder supply compartment and the build compartment adjacent to each other in a compact unit.
Referring again to
The chamber 140 is further characterized by a cross-sectional dimension 10, for example, a diameter for a circular cross-sectional profile, or a length or breadth for a rectangular cross-sectional profile. The term cross-sectional dimension as used in the context of
With continued reference to
Referring now to
As illustrated in
The build compartment 144 also includes a build platform 146 that is vertically moveable in the build compartment 144. Similar to the supply piston 145, the build platform may be operatively coupled to an actuator (not shown in Figures) that is operable to selectively move the build platform 146 up or down. Non-limiting examples of suitable actuators for the supply piston 145 and the build platform 146 may include pneumatic cylinders, hydraulic cylinders, ballscrew actuators, linear electric actuators, or combinations thereof. Further, the operating principle of the actuators for the supply piston 145 and the build platform 146 may be the same or different.
With continued reference to
Referring now to
The directed energy source 172 may include any device operable to generate a beam of suitable power and other operating characteristics, to melt and fuse the powder during the build process, described in more detail below. Suitable directed energy sources include, but are not limited to, laser device, an electron beam device, an infra-red (IR) device, an ultra-violet (UV) device, or combinations thereof. The laser device includes any laser device operating in a power range and other operating conditions for melting the powder material 143, such as, but not limited to, a fiber-optic laser, a CO2 laser, or a ND-YAG laser.
In some embodiments, a beam steering apparatus 174 may also be used to direct the energy beam from the directed energy source 172. The beam steering apparatus may include one or more mirrors, prisms, or lenses. The beam-steering apparatus may be further operatively coupled to one or more actuators (not shown in Figures), and arranged so that an energy beam from the directed energy source 172 can be focused to a desired spot size and steered to a desired position in an X-Y plane coincident with the worksurface 121.
The operation of the additive manufacturing apparatus 100, in accordance with some embodiments of the present disclosure, is further described in the context of
Referring now to
After a build layer 147 is formed, the build platform 146 is configured to move vertically downward by a build layer thickness “T” increment as shown in
In some embodiments, an additive manufacturing apparatus including a plurality of build modules, as described herein above, is also presented. Each build module of the plurality of modules includes a support structure and an integrated build unit formed in the support structure. The integrated build unit includes a chamber. The chamber includes a powder supply compartment, formed in the chamber; and a build compartment, formed in the chamber adjacent to the powder supply compartment. A separator is disposed between the powder supply compartment and the build compartment. The powder supply compartment includes a powder material and the build compartment includes a build platform.
As noted earlier, each build module of the plurality of build modules includes an integrated build unit, described herein earlier. Build modules 110 and 210 are described herein in detail. However, the description of build modules 110 and 210 also applies to build modules 310 and 410.
With continued reference to
Similarly, the build module 210 includes a support structure 220 and an integrated build unit 230 formed in the support structure 220. The integrated build unit 230 includes a chamber 240. The chamber 240 includes a powder supply compartment 242, formed in the chamber 240; and a build compartment 244, formed in the chamber 240 adjacent to the powder supply compartment 242. A separator 250 is disposed between the powder supply compartment 242 and the build compartment 244.
As illustrated in
Similar to the supply pistons 145, 245, the build platforms 146, 246 may be each operatively coupled to an actuator (not shown in Figures) that is operable to selectively move the build platforms 146, 246, up or down. Non-limiting examples of suitable actuators for the supply pistons 145, 245 and the build platforms 146, 246 may include pneumatic cylinders, hydraulic cylinders, ballscrew actuators, linear electric actuators, or combinations thereof. Further, the operating principles of the actuators for the supply pistons 145, 245 and the build platforms 146, 246 may be the same or different.
In some embodiments, the powder material in the powder supply compartments of each build module of the plurality of build modules is the same. In some such embodiments, the additive manufacturing apparatus 200 may be configured to build same type of parts. In some embodiments, the powder material in the powder supply compartments of at least two of the build modules of the plurality of build modules is different. In some such embodiments, the additive manufacturing apparatus 200 may be configured to build at least two different type of parts. In some embodiments, the powder material in the powder supply compartments of all the build modules of the plurality of build modules is different. Non-limiting examples of the suitable powder material may include a metallic (including metal alloys) powder, a polymeric powder, a ceramic powder, or combinations thereof.
Referring again to
The chambers 140 and 240 are further characterized by a cross-sectional dimension 10 and 20, respectively. The cross-sectional dimension, for example, may be a diameter for a circular cross-sectional profile, or a length or breadth for a rectangular cross-sectional profile. The term “cross-sectional dimension” has been described in detail earlier. In some embodiments, a cross-sectional dimension 10, 20 of the chambers 140, 240 is less than 100 millimeters. Therefore, in the context of a circular cross-sectional profile illustrated in
In some embodiments, the additive manufacturing apparatus 200 further includes a powder applicator configured to distribute a required amount of the powder material from the powder supply compartment to the build platform in the build compartment of each build module of the plurality of build modules.
Referring now to
The powder applicator 160 may be a rigid, laterally-elongated structure that is disposed on the worksurface 221 and is moveable on the worksurfaces 121, 221. The powder applicator 160 may be operably connected to an actuator (not shown in Figures), and operable to selectively move the powder applicator 160 parallel to the work surfaces 121, 221. As depicted in
In some embodiments, the additive manufacturing apparatus 200 further includes an energy module including a directed energy source. The additive manufacturing apparatus is configured to direct an energy beam “E” onto the powder material distributed on the build platform in the build compartment of each build module of the plurality of build modules, to form a plurality of build layers.
With continued reference to
In some embodiments, each build module of the plurality of build modules in the additive manufacturing apparatus 200 includes a powder applicator. Each powder applicator in the plurality of build module sis configured to distribute a required amount of the powder material from the powder supply compartment to the build platform in the build compartment of the corresponding build module of the plurality of build modules.
Referring now to
The powder applicators 160, 260 may be rigid, laterally-elongated structures that are disposed on or contact the worksurfaces 121, 221, respectively; and are moveable on the worksurfaces 121, 221, respectively. The powder applicators 160, 260 may be operably connected to respective actuators (not shown in Figures), and operable to selectively move the powder applicators 160, 260 parallel to the worksurfaces 121, 221. As depicted in
In some embodiments, the additive manufacturing apparatus 200 further includes a plurality of energy modules. Each energy module of the plurality of energy modules includes a directed energy source configured to direct an energy beam “E” onto the powder material distributed on the build platform in the build compartment of the corresponding build module of the plurality of build modules, to form a plurality of build layers.
With continued reference to
Referring now to
The operation of a build module in the plurality of build modules of
The appended claims are intended to claim the invention as broadly as it has been conceived and the examples herein presented are illustrative of selected embodiments from a manifold of all possible embodiments. Accordingly, it is the Applicants' intention that the appended claims are not to be limited by the choice of examples utilized to illustrate features of the present disclosure. As used in the claims, the word “comprises” and its grammatical variants logically also subtend and include phrases of varying and differing extent such as for example, but not limited thereto, “consisting essentially of” and “consisting of.” Where necessary, ranges have been supplied; those ranges are inclusive of all sub-ranges there between. It is to be expected that variations in these ranges will suggest themselves to a practitioner having ordinary skill in the art and where not already dedicated to the public, those variations should where possible be construed to be covered by the appended claims. It is also anticipated that advances in science and technology will make equivalents and substitutions possible that are not now contemplated by reason of the imprecision of language and these variations should also be construed where possible to be covered by the appended claims.
