CN115138869A - Multi-material layered composite workpiece and three-dimensional forming device and method thereof - Google Patents
Multi-material layered composite workpiece and three-dimensional forming device and method thereof Download PDFInfo
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- CN115138869A CN115138869A CN202110354618.8A CN202110354618A CN115138869A CN 115138869 A CN115138869 A CN 115138869A CN 202110354618 A CN202110354618 A CN 202110354618A CN 115138869 A CN115138869 A CN 115138869A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/003—Apparatus, e.g. furnaces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y80/00—Products made by additive manufacturing
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- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
The application provides a multi-material layered composite workpiece and a three-dimensional forming device and method thereof. The feeding device comprises a first powder storage unit, a second powder storage unit and a feeding piece, wherein first material powder is arranged in the first powder storage unit, second material powder is arranged in the second powder storage unit, and the first powder storage unit and the second powder storage unit are arranged at one end of the feeding piece in parallel; the feeding piece is used for sequentially laying the first material powder and the second material powder on the forming platform; the laser device is used for emitting first laser and second laser to the shaping platform in proper order, and first laser is used for the first material powder of melting, takes shape first material layer, and second laser is used for melting second material powder, takes shape the second material layer, first material layer with the second material layer sets up in turn, makes many material stratiform composite workpiece can show the special properties that single material does not possess, improves the wholeness ability and the range of application of work piece.
Description
Technical Field
The application relates to the technical field of three-dimensional forming, in particular to a multi-material layered composite workpiece and a three-dimensional forming device and method thereof.
Background
The selective laser melting technology provides an efficient and advanced manufacturing method for manufacturing parts with complex structures, in the prior art, workpieces manufactured by metal additive manufacturing are mostly printed by one material, so that the printed workpieces are single in performance and narrow in application range, and cannot meet the harsh requirements of more application scenes on service workpieces.
Disclosure of Invention
In view of the above situation, the present application provides a multi-material layered composite workpiece, and a three-dimensional forming apparatus and method thereof, in which a first material powder and a second material powder are sequentially laid to form and alternately arrange a first material layer and a second material layer, so that the multi-material layered composite workpiece can exhibit special properties that a single material cannot have, and the overall performance and the application range of the workpiece are improved.
The embodiment of the application provides a three-dimensional forming device, including shaping studio, shaping platform, laser device and feedway. The forming platform is arranged in the forming working chamber; the laser device is arranged above the forming platform; the feeding device is arranged above the forming working chamber. The feeding device comprises a first powder storage unit, a second powder storage unit and a feeding piece, wherein first material powder is arranged in the first powder storage unit, second material powder is arranged in the second powder storage unit, and the first powder storage unit and the second powder storage unit are arranged at the upper end of the feeding piece in parallel; the feeding piece is connected with the first powder storage unit and the second powder storage unit and used for sequentially laying the first material powder and the second material powder on the forming platform; the laser device is used for emitting first laser and second laser in proper order extremely the shaping platform, first laser is used for the first material powder of melting, the first material layer of shaping, the second laser is used for the second material powder of melting, the second material layer of shaping, first material layer with the second material layer sets up in turn.
In some embodiments, the feeding device further comprises a filter disposed at one end of the feeding member.
In some embodiments, the powder spreading device further comprises a powder spreading platform and a powder spreader, wherein the powder spreading platform is used for storing third material powder, the powder spreading platform is arranged below the forming working chamber and positioned on one side of the forming platform, and the powder spreader is used for spreading the third material powder on the forming platform.
In some embodiments, the powder spreading device further comprises a recovery device, wherein the recovery device is arranged below the forming working chamber and is positioned on one side of the forming platform, which faces away from the powder spreading platform.
In some embodiments, the first material powder comprises a corrosion-resistant metallic material and the second material powder comprises a thermally insulating material.
In some embodiments, the thermal conductivity detection device further comprises a thermal conductivity detection component, wherein the thermal conductivity detection component comprises a heating element and a heat measuring element, the heating element is movably arranged above the forming platform, and the heat measuring element is arranged at the bottom of the forming platform.
An embodiment of the present application further provides a three-dimensional molding method applied to the three-dimensional molding apparatus described in the above embodiment, the three-dimensional molding method including the steps of:
the feeding piece lays the first material powder to the forming platform;
the laser device emits first laser to the first material powder to form a first material layer;
the feeding piece lays second material powder on the surface of the first material layer;
the laser device emits second laser to second material powder to form a second material layer;
and detecting whether printing is finished or not, if not, repeating the step of laying the first material powder, and if so, stopping printing.
In some embodiments, after the step of forming the second material layer, further comprising the steps of:
the powder spreader spreads the third material powder on the surface of the second material layer;
the laser device emits third laser to third material powder to form a third material layer.
In some embodiments, before the step of the feeder laying the second material powder on the surface of the first material layer, the method further comprises the steps of: the feeding piece lays the first material powder on the surface of the first material layer, the laser device emits first laser to the first material powder, and the first material layer is formed again; zxfoom
After the step of forming the second material layer, further comprising the steps of: the feeding piece lays the second material powder on the surface of the second material layer, the laser device emits second laser to the second material powder, and the second material layer is formed again.
Embodiments of the present application also provide a multi-material layered composite workpiece, which is manufactured by the three-dimensional forming method according to the above embodiments, and includes a plurality of first material layers and a plurality of second material layers, where the plurality of first material layers and the plurality of second material layers are alternately arranged.
The application provides a many material laminar composite work piece and three-dimensional forming device and method thereof through laying first material powder and second material powder in proper order to the shaping sets up first material layer and second material layer in turn, makes many material laminar composite work piece can show the special properties that single material can't possess, improves the wholeness ability and the range of application of work piece.
Drawings
Fig. 1 is a schematic structural diagram of a three-dimensional molding apparatus in an embodiment.
FIG. 2 is a flow chart of a three-dimensional forming method in one embodiment.
FIG. 3 is a schematic structural diagram of a multi-material layered composite workpiece in one embodiment.
Description of the main element symbols:
| three-dimensional forming |
100 |
| Multi-material layered |
200 |
| Forming |
10 |
| |
20 |
| |
30 |
| |
40 |
| First |
41 |
| Second |
42 |
| |
43 |
| |
44 |
| |
50 |
| |
60 |
| Recovery device | 70 |
| A first material layer | 201 |
| Second material layer | 202 |
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.
Some embodiments of the present application are described in detail. In the following embodiments, features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, in one embodiment, a three-dimensional forming apparatus 100 includes a forming chamber 10, a forming table 20, a laser apparatus 30, and a feeding apparatus 40. The forming platform 20 is disposed in the forming chamber 10 and located below the forming chamber 10. The laser device 30 is disposed above the forming chamber 10, and is configured to emit laser to the forming platform 20. The feeding device 40 is disposed above the forming chamber 10, and is used for providing material powder to the forming platform 20.
Specifically, the feeding device 40 includes a first powder storage unit 41, a second powder storage unit 42 and a feeding member 43, and the first powder storage unit 41 and the second powder storage unit 42 are arranged in parallel at one end of the feeding member 43. A first material powder is arranged in the first powder storage unit 41, and a second material powder is arranged in the second powder storage unit 42. The feeding member 43 is connected to the first powder storage unit 41 and the second powder storage unit 42, and is used for sequentially laying the first material powder and the second material powder on the forming platform 20.
The laser device 30 sequentially emits first laser and second laser to the molding platform 20 according to the powder spreading condition of the first material powder and the second material powder, the first laser is used for melting the first material powder, and the second laser is used for melting the second material powder. Specifically, the first powder storage unit 41 firstly conveys the first material powder to the feeding member 43, then the feeding member 43 lays the first material powder to the forming platform 20 according to the layering information of the printed workpiece, and the laser device 30 further emits the first laser to the forming platform 20 to melt the first material powder and form the first material layer. The second powder storage unit 42 further delivers the second powder to the feeding member 43, the feeding member 43 lays the second powder on the surface of the first material layer according to another layer information of the printed workpiece, and the laser device 30 further emits the second laser to the second powder to melt the second powder to form the second material layer. The first material layers and the second material layers are alternately stacked to finally form the multi-material layered composite workpiece 200. In other embodiments, the first material layers and the second material layers may be stacked alternately in multiple layers, for example, one second material layer is stacked on each two first material layers, or multiple second material layers are spaced between adjacent first material layers, which may be set according to actual design requirements, and the present application is not limited thereto.
The laser device 30 includes, but is not limited to, a fiber laser, and the first laser and the second laser may be lasers with different energy parameters emitted by the same fiber laser. Parameters such as the power, the scanning rate and the like of the first laser and the second laser can be set according to the material properties of the first material powder and the second material powder. It is understood that, in other embodiments, the energy parameters of the first laser and the second laser may be the same, and may be set according to actual design requirements, and the application is not limited thereto.
In the embodiment of the application, the plasticity of the first material powder is better than that of the second material powder, the hardness of the second material powder is higher than that of the first material powder, and the material layers formed by the two materials are alternately arranged, so that the multi-material layered composite workpiece has high hardness and good plasticity, and the comprehensive mechanical property of the workpiece is improved. The first material powder comprises but is not limited to corrosion-resistant metal materials such as stainless steel and the like, and the corrosion resistance of the workpiece is improved. The second material powder comprises but is not limited to materials with higher hardness, such as 18Ni300 maraging steel, and is beneficial to manufacturing workpieces such as dies through a three-dimensional forming technology.
Further, in an embodiment, the feeding device 40 further includes a filter 44, and the filter 44 is disposed at an end of the feeding member 43 away from the first powder storage unit 41 and the second powder storage unit 42. The filter 44 is used for filtering material powder, preventing the material from caking, enabling the material powder particles paved on the forming platform to be uniform, and improving the printing quality.
In one embodiment of the present application, the three-dimensional forming device 100 further includes a powder laying platform 50 and a powder spreader 60. The powder laying platform 50 is used for storing third material powder, and the powder laying platform 50 is arranged below the forming working chamber 10 and located on one side of the forming platform 20. The powder spreader 60 is movably disposed in the forming chamber 10 for spreading the third material powder on the forming platform 20. The laser device 30 may also emit a third laser to the third material powder to shape the third material layer. Further, the powder spreader 60 may also be used to spread the first material powder or the second material powder delivered by the feeder 43 to the forming platform 20.
The first material layer, the second material layer and the third material layer can be formed into the multi-material layered composite workpiece in a combined mode of ABAB, ABCABC or ABABABCABC and the like, so that the multi-material layered composite workpiece can show special performance which cannot be achieved by a single material, has high hardness, strength, suitability for layering, heat insulation, heat resistance, wear resistance and the like, and improves the overall performance and application range of the printed workpiece.
In one embodiment of the present application, the three-dimensional forming device 100 further includes a recycling device 70, and the recycling device 70 is disposed below the forming chamber 10 and on a side of the forming platform 20 facing away from the powder laying platform 50. The recovery device 70 recovers the excess material powder in the molding chamber 10.
In order to improve the heat insulation property, heat resistance and the like of the printed workpiece, the second material powder or the third material powder includes a heat insulation material. The three-dimensional forming apparatus 100 may further include a thermal conductivity detection assembly (not shown) for detecting thermal conductivity of the print workpiece. The heat conduction detection subassembly includes the heating member and surveys hot-blast spare, the heating member removes to be located the top of shaping platform 20, survey hot-blast spare and locate the bottom of shaping platform 20. When the heat conduction rate of the printing workpiece needs to be measured, the heating element is arranged above the printing workpiece and starts to transfer heat Q to the printing workpiece, after a period of time t, the heat measuring element starts to detect the heat Q ', and the heat conduction efficiency of the printing workpiece can be calculated according to the transfer heat Q, the detection heat Q' and the transfer time t. The heat conduction detection assembly can detect the heat conduction rate of the printing workpiece in real time, and is favorable for adjusting parameters of different material layers at any time according to heat conduction requirements.
Referring to fig. 2, an embodiment of the present application further provides a three-dimensional forming method applied to the three-dimensional forming apparatus 100. The three-dimensional forming method comprises the following steps:
s1: the feeding piece is paved with first material powder.
Specifically, the three-dimensional model of the workpiece is led into the three-dimensional forming system, the three-dimensional model is subjected to layered slicing processing according to a preset program, then the first powder storage unit is started to convey first material powder to the feeding piece, then the feeding piece lays the first material powder to the forming platform according to layered information, and then the step S2 is carried out.
S2: the laser device emits first laser to the first material powder to form the first material layer.
In this step, the number of the first material layers may be one or more, and if the first material layer is one layer, the step S3 is directly performed after the first material layer is formed. If the first material layer is multilayer, after printing of the first material layer is completed, the feeding piece can lay the first material powder on the surface of the first material layer again, and the laser device emits the first laser to the first material powder again to form another first material layer. The step of shaping the first material layer may be repeated until the number of first material layers reaches a preset value, followed by proceeding to step S3.
S3: the feeding piece lays the second material powder on the surface of the first material layer.
Specifically, the controller firstly opens the second powder storage unit to enable the second material powder to be conveyed to the feeding piece, then the feeding piece lays the second material powder on the surface of the first material layer according to the layering information of the printed workpiece, and then the step S4 is carried out.
S4: the laser device emits second laser to the second material powder to form a second material layer.
In this step, the number of the second material layers may also be one or more, and if the second material layer is one layer, the second material layer is directly processed to step S5 after being formed. If the second material layer is multilayer, after printing of the second material layer is finished, the feeding piece lays second material powder on the surface of the second material layer, the laser device emits second laser to the second material powder, and the second material layer is formed again. The step of shaping the second material layer may be repeated until the number of second material layers reaches a preset value, and then step S5 is proceeded to.
S5: and detecting whether the printing is finished, if not, repeating the step of paving the first material powder, and if so, stopping the printing.
In one embodiment of the present application, the multi-material layered composite workpiece 200 is composed of three different material layers, and after step S4, the three-dimensional forming method may further include the steps of:
the powder spreader spreads the third material powder on the surface of the second material layer.
The laser device emits third laser to third material powder to form a third material layer. The powder spreading process of the third material powder and the forming process of the third material layer are similar to those of the first material layer, and are not described again here.
In one embodiment of the present application, the three-dimensional forming method may further include:
and carrying out heat treatment on the printed multi-material layered composite workpiece, so that the comprehensive mechanical property of the workpiece is improved. The heat treatment includes, but is not limited to, solution treatment and aging treatment.
Referring to fig. 3, embodiments of the present application further provide a multi-material layered composite workpiece 200, which is manufactured by the above three-dimensional forming method. The multi-material layered composite workpiece 200 has a layered structure, and comprises a plurality of first material layers 201 and a plurality of second material layers 202, wherein the plurality of first material layers 201 and the plurality of second material layers 202 are arranged at intervals. The first material layer 201 and the second material layer are respectively formed by three-dimensional printing and layer-by-layer accumulation of first material powder and second material powder. The thickness of the first material layer 201 and the second material layer is 70-130 μm, preferably 100 μm.
In the embodiments of the present application, the first material powder includes, but is not limited to, a corrosion-resistant metal material such as stainless steel. The second material powder includes, but is not limited to, materials with higher hardness such as 18Ni300 maraging steel (die steel).
TABLE 1 comparison of mechanical properties of stainless steels, die steels and layered structural workpieces
| Type (B) | Tensile strength Mpa | Yield strength Mpa | Elongation% percent |
| 316 stainless steel | 680 | 520 | 36 |
| 18Ni300 die steel | 1080 | 910 | 8 |
| Layered structure | 790 | 16 |
Table 1 shows the mechanical properties of a single material workpiece compared to a multi-material layered composite workpiece having a layered structure. Different material layers are alternately stacked, so that the multi-material layered composite workpiece can show special performance which can not be possessed by a single material, and has high hardness, strength, suitability for layering, heat insulation, heat resistance, wear resistance and the like.
In an embodiment, the multi-material layered composite workpiece 200 may further include a third material layer or more material layers to meet the actual design requirement, which is not limited herein. The first material layer, the second material layer and the third material layer form the multi-material layered composite workpiece 200 in combination mode such as ABCABC or ABABC.
Although the present application has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the present application.
Claims (10)
1. A three-dimensional modeling apparatus, comprising:
a forming working chamber;
the forming platform is arranged in the forming working chamber;
the laser device is arranged above the forming platform; and
a feeding device arranged above the forming working chamber,
the feeding device is characterized by comprising a first powder storage unit, a second powder storage unit and a feeding piece, wherein first material powder is arranged in the first powder storage unit, second material powder is arranged in the second powder storage unit, and the first powder storage unit and the second powder storage unit are arranged at the upper end of the feeding piece in parallel; the feeding piece is used for sequentially laying first material powder and second material powder on the forming platform; the laser device is used for emitting first laser and second laser in proper order extremely the shaping platform, first laser is used for melting first material powder, takes shape first material layer, the second laser is used for melting second material powder, takes shape the second material layer, first material layer with the second material layer sets up in turn.
2. The three-dimensional forming apparatus as claimed in claim 1, wherein said supply means further comprises a filter disposed at one end of said feeder.
3. The three-dimensional forming device according to claim 1, further comprising a powder laying platform for storing a third material powder, the powder laying platform being provided below the forming work chamber and on one side of the forming platform, and a powder laying device for laying the third material powder on the forming platform.
4. The three-dimensional forming device as claimed in claim 3, further comprising a recycling device disposed below the forming chamber and on a side of the forming platform facing away from the powder laying platform.
5. The three-dimensional forming apparatus according to claim 1, wherein the first material powder comprises a corrosion-resistant metal material and the second material powder comprises a heat insulating material.
6. The three-dimensional forming device according to claim 1, further comprising a thermal conduction detection assembly, wherein the thermal conduction detection assembly comprises a heating element and a heat measuring element, the heating element is movably arranged above the forming platform, and the heat measuring element is arranged at the bottom of the forming platform.
7. A three-dimensional molding method applied to the three-dimensional molding apparatus according to claims 1 to 6, characterized in that the three-dimensional molding method comprises the steps of:
the feeding piece lays the first material powder to the forming platform;
the laser device emits first laser to the first material powder to form a first material layer;
the feeding piece lays second material powder on the surface of the first material layer;
the laser device emits second laser to second material powder to form a second material layer;
and detecting whether printing is finished or not, if not, repeating the step of laying the first material powder, and if so, stopping printing.
8. The three-dimensional forming method of claim 7, further comprising, after the step of forming the second material layer, the steps of:
the powder spreader spreads the third material powder on the surface of the second material layer;
the laser device emits a third laser to the third material powder to form a third material layer.
9. The three-dimensional forming method according to claim 8,
before the step of the feeder laying the second material powder on the surface of the first material layer, the method further comprises the following steps: the feeding piece lays the first material powder on the surface of the first material layer, the laser device emits first laser to the first material powder, and the first material layer is formed again; or
After the step of forming the second material layer, further comprising the steps of: the feeding piece lays the second material powder on the surface of the second material layer, and the laser device emits second laser to the second material powder to form the second material layer again.
10. A multi-material layered composite workpiece made by the three-dimensional forming method of claims 7-9, wherein the multi-material layered composite workpiece comprises a plurality of first material layers and a plurality of second material layers, the plurality of first material layers alternating with the plurality of second material layers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110354618.8A CN115138869A (en) | 2021-03-31 | 2021-03-31 | Multi-material layered composite workpiece and three-dimensional forming device and method thereof |
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| CN202110354618.8A CN115138869A (en) | 2021-03-31 | 2021-03-31 | Multi-material layered composite workpiece and three-dimensional forming device and method thereof |
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| US20180311757A1 (en) * | 2017-04-28 | 2018-11-01 | Divergent Technologies, Inc. | Additive manufacturing control systems |
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| CA3091665A1 (en) * | 2019-08-29 | 2021-02-28 | Huazhong University Of Science And Technology | Forming system and method of hybrid additive manufacturing and surface coating |
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2021
- 2021-03-31 CN CN202110354618.8A patent/CN115138869A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234409A (en) * | 2015-10-27 | 2016-01-13 | 上海航天精密机械研究所 | Powder feeding method and device for multi-material selective laser melting integral forming |
| CN205929446U (en) * | 2016-06-23 | 2017-02-08 | 黄贤页 | Powder and fashioned 3D printing device are spread to many materials |
| CN106378450A (en) * | 2016-10-17 | 2017-02-08 | 华南理工大学 | Additive manufacturing equipment and method suitable for selective laser melting of various materials |
| CN106735220A (en) * | 2017-01-17 | 2017-05-31 | 华南理工大学 | A kind of many material laser selective melting shaped devices and method |
| US20180311757A1 (en) * | 2017-04-28 | 2018-11-01 | Divergent Technologies, Inc. | Additive manufacturing control systems |
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| CA3091665A1 (en) * | 2019-08-29 | 2021-02-28 | Huazhong University Of Science And Technology | Forming system and method of hybrid additive manufacturing and surface coating |
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