Heterogeneous material laser selective melting mixed powder device

Abstract

The application discloses a kind of heterogeneous material laser selective melting mixed powder device of additive manufacturing, belong to the technical field of additive manufacturing, including powder supply component, mixed powder component and powder falling component, when needing to supply mixed powder, the opening is made to be upwards by the warehouse body drive mechanism, the powder supply outlet of two powder supply volume control mechanisms is communicated with mixed powder bin to carry out the supply of A powder and B powder, subsequently the stirring drive portion drives stirring portion to stir the powder in mixed powder bin, after stirring is completed, the opening is communicated with the mixed powder channel to carry out the supply of mixed powder, when A powder and B powder are respectively supplied, the opening is made to be downwards by the warehouse body drive mechanism, the powder supply outlet of the powder supply volume control mechanism corresponding to the A powder tank is communicated with A powder channel, the powder supply outlet of the powder supply volume control mechanism corresponding to the B powder tank is communicated with B powder channel.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and specifically to a powder mixing device for additive manufacturing of heterogeneous materials using laser selective melting. Background Technology

[0002] Selective laser melting (SLM) is an increasingly mature metal 3D printing technology. Its perfect match between forming accuracy and forming efficiency has broad application prospects in various industries such as aerospace, shipbuilding, power equipment, rail transportation, automobiles, molds, medical, and home appliances. It is an effective technical means to achieve the goals of internal flow channels, curved surface features, integral forming, feature manufacturing, and lightweighting.

[0003] Traditional additive manufacturing technology is limited to a single homogeneous material and cannot meet the production requirements of special performance parts, such as rocket heat shields, heat exchange tubes, engine cavities and other hot-end components. These parts need to maintain high heat resistance and high thermal conductivity in the working area, while only needing to maintain a certain strength in the non-working area, while also reducing production costs.

[0004] Selective laser melting additive manufacturing technology for heterogeneous materials integrates multiple materials into a single part according to structural and functional requirements. It offers greater design freedom in terms of material composition, shape, structure, and macroscopic properties. It can deposit different materials onto any location on a component through precise adjustments, and can customize parts according to environmental and structural requirements. It breaks through many limitations of traditional multi-material preparation technologies, is suitable for preparing parts with complex functions and structures, has low production costs and excellent performance, and is the most ideal forming solution for high-performance parts. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: by controlling the powder supply of two metal powders and realizing the mixing of the two metal powders, combined with the individual powder drop control of the two powders and the powder drop control of the mixed powder, the components of the two metal powders or the mixed powder can be selected as needed to achieve the purpose of additive mixing of heterogeneous materials.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a powder mixing device for selective laser melting additive manufacturing of heterogeneous materials, comprising: a powder feeding component, a powder mixing component, and a powder dropping component; The powder supply assembly includes a powder box A, a powder box B, and two powder supply control mechanisms corresponding to the powder boxes A and B. The powder supply inlets of the two powder supply control mechanisms are respectively connected to the powder outlets of the powder boxes A and B. The powder mixing assembly includes a powder mixing seat, a powder mixing chamber, a chamber driving mechanism, and a powder mixing stirring mechanism. The powder mixing seat has a powder mixing chamber, and the upper part of the powder mixing chamber is connected to the powder supply outlets of the two powder supply control mechanisms. The lower part of the powder mixing chamber is connected to the powder discharge nozzle in the powder discharge assembly. The powder discharge nozzle includes an A powder channel, a B powder channel, and a mixed powder channel. The powder mixing chamber is located inside the powder mixing cavity. An opening is provided on the powder mixing chamber. A powder mixing chamber partition is provided on the side of the powder mixing chamber facing away from the opening. The chamber body drive mechanism is provided on the powder mixing seat and its output end extends into the powder mixing cavity and is connected to the powder mixing chamber drive mechanism to drive the powder mixing chamber to rotate so that the opening switches between facing up and facing down. The powder mixing mechanism includes a mixing part and a mixing drive part. The mixing part is located in the powder mixing chamber, and the mixing drive part is disposed on the powder mixing seat and its output end extends into the powder mixing chamber and is driven to connect with the mixing part to drive the mixing part to perform mixing. When mixed powder needs to be supplied, the hopper drive mechanism causes the opening to face upwards, and the powder supply outlets of the two powder supply control mechanisms are connected to the mixing hopper to supply powder A and powder B. Then, the stirring drive unit drives the stirring unit to stir the powder in the mixing hopper. After stirring is completed, the hopper drive mechanism causes the opening to face downwards and connects to the mixed powder channel to supply mixed powder. When powder A and powder B are supplied separately, the silo drive mechanism causes the opening to face downwards and the powder mixing silo partition to face upwards. At this time, the powder mixing silo partition is located between the powder supply outlets of the two powder supply control mechanisms. The powder supply outlet of the powder supply control mechanism corresponding to powder A box is connected to the powder A channel, and the powder supply outlet of the powder supply control mechanism corresponding to powder B box is connected to the powder B channel.

[0007] As a preferred embodiment of the present invention, the powder supply control mechanism includes a base, a powder supply servo motor, and a powder supply roller shaft. The base corresponding to powder box A is installed at the powder outlet of powder box A, and the base corresponding to powder box B is installed at the powder outlet of powder box B. The base has a base cavity. The powder supply inlet of the base cavity corresponding to powder box A is connected to the powder outlet of powder box A, and the powder supply inlet of the base cavity corresponding to powder box B is connected to the powder outlet of powder box B. The powder supply servo motor is installed on the corresponding base, and the powder supply roller shaft is located inside the base cavity. The output end of the powder supply servo motor extends into the corresponding base cavity and connects to the powder supply roller shaft. The powder supply roller shaft has several splines evenly distributed on it.

[0008] As a preferred embodiment of the present invention, the powder mixing seat is installed at the powder supply outlet positions of the seat cavity corresponding to powder box A and the seat cavity corresponding to powder box B, and the upper part of the powder mixing cavity is connected to the powder supply outlet positions of the seat cavity corresponding to powder box A and the seat cavity corresponding to powder box B, respectively.

[0009] As a preferred embodiment of the present invention, the silo drive mechanism includes a pneumatic swing platform, which is disposed on the powder mixing seat and its output end extends into the powder mixing chamber and is driven and connected to the powder mixing silo.

[0010] As a preferred embodiment of the present invention, the stirring drive unit includes a stirring servo motor, which is disposed on the powder mixing seat.

[0011] As a preferred embodiment of the present invention, the stirring part includes a stirring shaft and stirring blades. The stirring blades are disposed on the outer periphery of the stirring shaft, the stirring shaft is located inside the powder mixing chamber, and the output end of the stirring servo motor extends into the powder mixing chamber and is connected to the stirring shaft.

[0012] As a preferred embodiment of the present invention, the A powder box is provided with an A powder inlet, and the B powder box is provided with a B powder inlet.

[0013] As a preferred embodiment of the present invention, the A powder box is provided with an A powder observation window, and the B powder box is provided with a B powder observation window.

[0014] As a preferred embodiment of the present invention, the A powder box is equipped with an A powder level gauge.

[0015] As a preferred embodiment of the present invention, a B powder level gauge is provided on the B powder box.

[0016] The beneficial effects of this invention are reflected in: By setting powder supply control mechanisms corresponding to powder A and powder B, the supply of powder A and powder B can be controlled separately. A mixing and stirring mechanism, in conjunction with a mixing chamber, can mix powder A and powder B. A chamber drive mechanism, also in conjunction with the mixing chamber, ensures that when mixing is needed, the mixing chamber, after mixing with the mixing and stirring mechanism, faces downwards, allowing the mixed powder to fall through the downward-facing opening into the mixing channel, thus supplying the mixed powder. When either powder A or powder B is needed, the mixing chamber opening faces downwards, and guided by the outer wall of the mixing chamber, powder A falls through the powder A channel, and powder B falls through the powder B channel. The powder guides powder A and powder B separately on the outer wall of the mixing chamber, preventing them from mixing and ensuring the purity of the powder when supplied individually. This process can meet the needs of layer printing with two different powders and one mixed powder, enabling alternating layer printing with a single powder and online mixed powder variable proportion layer printing. It allows for greater design freedom in terms of materials and structure, and can deposit different materials or their proportions onto the required positions of the component. Customized parts can be made according to actual needs, suitable for manufacturing parts with complex functions and structures. It has low production costs and excellent performance, making it the ideal forming solution for high-performance parts. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the powder supply component and other parts of the present invention; Figure 3 This is a front view schematic diagram of the powder supply component and other parts of the present invention; Figure 4 This is a side cross-sectional view of the powder supply component and other parts of the present invention; Figure 5 This is a cross-sectional schematic diagram of the base and other parts of the present invention; Figure 6 This is a schematic diagram of the powder mixing component of the present invention; Figure 7 This is a cross-sectional schematic diagram of the powder mixing component and other parts of the present invention; Figure 8 This is a schematic diagram of the powder mixing chamber of the present invention; Figure 9 This is a cross-sectional schematic diagram of the powder mixing chamber of the present invention; Figure 10 This is a schematic diagram of the stirring section of the present invention; Figure 11 This is a front view schematic diagram of the stirring section of the present invention; Figure 12 This is a schematic diagram of the powder-discharging component of the present invention; Figure 13 This is a cross-sectional schematic diagram of the powder mixing seat and other parts of the present invention; Figure 14 This is a cross-sectional schematic diagram of the powder mixing seat and powder dispensing nozzle of the present invention.

[0018] In the diagram: 1. Powder box A; 2. Powder box B; 3. Base; 31. Base cavity; 4. Powder supply servo motor; 5. Powder supply roller shaft; 6. Powder mixing seat; 61. Powder mixing chamber; 7. Powder mixing bin; 71. Opening; 72. Powder mixing bin partition; 8. Pneumatic swing table; 9. Stirring servo motor; 10. Stirring shaft; 11. Stirring fan blade; 12. Powder drop nozzle; 121. Powder A channel; 122. Powder B channel; 123. Mixed powder channel; 124. Mixed powder channel partition; 13. Powder drop mounting seat; 14. Powder A inlet; 15. Powder B inlet; 16. Powder A observation window; 17. Powder B observation window; 18. Powder A level gauge; 19. Powder B level gauge. Detailed Implementation

[0019] The invention will now be described in further detail with reference to the accompanying drawings.

[0020] Combined with appendix Figure 1-14 As shown, a powder mixing device for selective laser melting additive manufacturing of heterogeneous materials includes an A powder box 1, a B powder box 2, a base 3, a base cavity 31, a powder supply servo motor 4, a powder supply roller shaft 5, a powder mixing seat 6, a powder mixing chamber 61, a powder mixing bin 7, an opening 71, a powder mixing bin partition 72, a pneumatic swing table 8, a stirring servo motor 9, a stirring shaft 10, a stirring fan blade 11, a powder drop nozzle 12, an A powder channel 121, a B powder channel 122, a mixed powder channel 123, a mixed powder channel partition 124, a powder drop mounting seat 13, an A powder inlet 14, a B powder inlet 15, an A powder observation window 16, a B powder observation window 17, an A powder level gauge 18, and a B powder level gauge 19.

[0021] Combined with appendix Figure 1-14As shown, a powder mixing device for selective laser melting additive manufacturing of heterogeneous materials includes: a powder supply component, a powder mixing component, and a powder discharge component. The powder supply component includes a powder box A 1, a powder box B 2, and two powder supply quantity control mechanisms corresponding to powder box A 1 and powder box B 2. The powder supply inlets of the two powder supply quantity control mechanisms are respectively connected to the powder outlets of powder box A 1 and powder box B 2. Specifically, the powder supply quantity control mechanism includes a base 3, a powder supply servo motor 4, and a powder supply roller 5. The base 3 corresponding to powder box A 1 is installed at the powder outlet position of powder box A 1, and the base 3 corresponding to powder box B 2 is installed at the powder outlet position of powder box B 2. A base cavity 31 is opened in the base 3, and the powder supply inlet of the base cavity 31 corresponding to powder box A 1 is connected to the powder outlet of powder box A 1. The powder inlet is connected to the powder outlet of the base cavity 31 corresponding to powder box 2 (B). The powder supply servo motor 4 is mounted on the corresponding base 3. The powder supply roller shaft 5 is located inside the base cavity 31. The output end of the powder supply servo motor 4 extends into the corresponding base cavity 31 and connects to the powder supply roller shaft 5. Several splines are evenly distributed on the powder supply roller shaft 5. Preferably, the base 3 consists of upper and lower parts, which are spliced ​​together by bolts to form the base 3. The powder supply servo motor 4 is connected to the powder supply roller shaft 5 through a coupling. The powder supply roller shaft 5 is mounted inside the base cavity 31 through rolling bearings. The powder mixing assembly includes a powder mixing seat 6, a powder mixing chamber 7, a chamber drive mechanism, and a powder mixing and stirring mechanism. The powder mixing seat 6 has a powder mixing chamber 61, and the powder mixing... The upper part of the mixing chamber 61 is connected to the powder supply outlets of two powder supply control mechanisms. Specifically, the mixing seat 6 is installed at the powder supply outlet positions of the seat cavity 31 corresponding to powder box A 1 and the seat cavity 31 corresponding to powder box B 2. The upper part of the mixing chamber 61 is connected to the powder supply outlets of the seat cavity 31 corresponding to powder box A 1 and the seat cavity 31 corresponding to powder box B 2. The lower part of the mixing chamber 61 is connected to the powder dispensing nozzle 12 in the powder dispensing assembly. Specifically, the powder dispensing assembly also includes a powder dispensing mounting base 13. The powder dispensing nozzle 12 is installed below the mixing seat 6 through the powder dispensing mounting base 13. The powder dispensing nozzle 12 includes an A powder channel 121, a B powder channel 122, and a mixed powder channel 123. Specifically, the powder box A 1 is provided with an A powder inlet 14. The B powder box 2 is equipped with a B powder inlet 15, the A powder box 1 is equipped with an A powder observation window 16, the B powder box 2 is equipped with a B powder observation window 17, the A powder box 1 is equipped with an A powder level gauge 18, and the B powder box 2 is equipped with a B powder level gauge 19. Preferably, both the B powder level gauge 18 and the B powder level gauge 19 are level gauges. The level gauge sensors are used to monitor the amount of metal powder. A powder is added to the A powder box 1 through the A powder inlet 14, and B powder is added to the B powder box 2 through the B powder inlet 15. The A powder observation window 16 is used to observe the condition of the A powder box 1, and the B powder observation window 17 is used to observe the condition of the B powder box 2. The A powder level gauge 18 is used to provide early warning of the A powder inventory in the A powder box 1.The B-powder level gauge 19 is used to provide early warning of the B-powder level in the B-powder box 2. When A-powder is supplied, A-powder enters the seat cavity 31 through the powder outlet of the A-powder box 1. Through the splines on the powder supply roller shaft 5, A-powder falls into the corresponding splines of the powder supply roller shaft 5. Subsequently, the powder supply servo motor 4 drives the powder supply roller shaft 5 to rotate, and A-powder continues to fall into the remaining splines of the powder supply roller shaft 5. As the powder supply roller shaft 5 rotates, the spline containing A-powder moves to the powder supply outlet position of the seat cavity 31. When powder B is supplied, it falls into the mixing chamber 61 through the corresponding powder supply outlet. Similarly, when powder B is supplied, powder B, with the help of the corresponding powder supply servo motor 4 and the corresponding powder supply roller 5, falls into the mixing chamber 61 through the powder supply outlet of the corresponding seat cavity 31. Since the specifications of the splines are known in advance and the splines are evenly arranged on the powder supply roller 5, the amount of powder supplied can be controlled by the number of rotations of the powder supply roller 5, thereby achieving precise control of the powder supply amount.

[0022] Combined with appendix Figure 1-9 As shown, the mixing chamber 7 is located inside the mixing cavity 61. The mixing chamber 7 has an opening 71. A mixing chamber partition 72 is provided on the outer side of the mixing chamber 7, opposite to the opening 71. Preferably, the angle between the shortest distance line connecting the two sides of the opening 71 along the axis and the axis of the mixing chamber 7 is 96°. The chamber body driving mechanism is provided on the mixing seat 6 and its output end extends into the mixing cavity 61 and is driven to connect with the mixing chamber 7. It is used to drive the mixing chamber 7 to rotate so that the opening 71 switches between facing up and facing down. Specifically, the chamber body driving mechanism includes a pneumatic swing table 8. The pneumatic swing table 8 is provided on the mixing seat 6 and its output end extends into the mixing cavity 61 and is driven to connect with the mixing chamber 7. By providing the pneumatic swing table 8, the mixing chamber 7 can be driven to rotate.

[0023] Combined with appendix Figure 1-14 As shown, the powder mixing mechanism includes a mixing section and a mixing drive section. The mixing section is located inside the powder mixing chamber 7. The mixing drive section is mounted on the powder mixing base 6 and its output end extends into the powder mixing chamber 7 and is connected to the mixing section for driving the mixing section to perform mixing. Specifically, the mixing drive section includes a mixing servo motor 9, which is mounted on the powder mixing base 6. The mixing section includes a mixing shaft 10 and mixing blades 11. The mixing blades 11 are located on the outer periphery of the mixing shaft 10, which is located inside the powder mixing chamber 7. The output end of the mixing servo motor 9 extends into the powder mixing chamber 7 and is connected to the mixing shaft 10. Preferably, the mixing shaft 10 is mounted in the powder mixing chamber 7 via a corresponding mixing shaft rolling bearing. The mixing servo motor 9 is connected to the mixing shaft 10 via a key. The mixing blades 11 adopt a double helix structure. The mixing servo motor 9 drives the mixing shaft 10 to rotate. Under the action of the double helix mixing blades 11, the metal powder can be mixed more evenly.

[0024] Combined with appendix Figure 1-14 As shown, when mixed powder needs to be supplied, the hopper drive mechanism causes the opening 71 to face upwards, and the powder supply outlets of both powder supply control mechanisms are connected to the mixing hopper 7 to supply powder A and powder B. Subsequently, the stirring drive unit drives the stirring unit to stir the powder in the mixing hopper 7. After stirring is completed, the hopper drive mechanism causes the opening 71 to face downwards and connect to the mixed powder channel 123 to supply mixed powder. Specifically, when supplying mixed powder, powder A first passes through the powder supply servo motor 4 and the powder supply roller 5 corresponding to powder A, and is supplied according to the required supply amount. Similarly, powder B is supplied according to the required amount. The powder is supplied in quantity. At this time, the pneumatic swing table 8 makes the opening 71 of the powder mixing chamber 7 face upward, and powder A and powder B fall into the powder mixing chamber 7. Then, the stirring servo motor 9 drives the stirring shaft 10 to rotate, so that powder A and powder B are mixed. After the mixing of powder A and powder B is completed, the pneumatic swing table 8 drives the powder mixing chamber 7 to rotate, so that the powder mixing chamber 7 is flipped 180° and the opening 71 faces downward. Under the action of gravity, the mixed metal powder in the powder mixing chamber 7 falls through the powder mixing channel 123. Preferably, the powder mixing channel extends into the powder mixing chamber 61 with a powder mixing channel partition 124 to ensure that the mixed powder does not leak out from the powder A channel or the powder B channel. When powder A and powder B are supplied separately, the silo drive mechanism causes the opening 71 to face downwards and the mixing silo partition 72 to face upwards. At this time, the mixing silo partition 72 is located between the powder supply outlets of the two powder supply control mechanisms. The powder supply outlet of the powder supply control mechanism corresponding to powder A box 1 is connected to powder A channel 121, and the powder supply outlet of the powder supply control mechanism corresponding to powder B box 2 is connected to powder B channel 122. Specifically, when powder A or powder B is supplied, the pneumatic swing table 8 causes the opening 71 of the mixing silo 7 to face downwards, and the mixing silo partition 72 to face upwards and be located between the powder supply outlets corresponding to powder A and powder B. Then powder A or powder B is supplied. Under the guidance of the outer wall of the mixing silo 7, powder A falls through powder A channel 121, and powder B falls through powder B channel 122.

[0025] Working principle: Taking a printing area of ​​250×250mm as an example, the powder layer is 3.04mm thick in a single application, including a 3mm thick powder absorption layer and a 0.04mm thick powder layer. The amount of powder required per application is approximately 0.2L, which is about 18mm from the bottom of the powder mixing chamber 7. This component space design can ensure that the powder is fully mixed and also keep the powder in the lower part of the powder mixing chamber 7, thereby reducing dust. When printing in duplicate, i.e. printing with either A powder or B powder, the pneumatic swing table 8 makes the opening 71 face downwards to control the supply of A powder or B powder. A powder moves through the outer wall of the mixing chamber 7 and falls through the A powder channel 121, while B powder is guided through the outer wall of the mixing chamber 7 and falls through the B powder channel 122, thus completing the overall supply of A powder or B powder. After the powder is supplied, the powder falls onto the external printing platform, where it is spread using the mounting brackets that come with the printing platform, and then proceeds to the next process. During mixed printing, the supply of powder A and powder B is controlled according to the mixing ratio of powder A and powder B. At this time, the pneumatic swing table 8 makes the opening 71 face upward, and the supplied powder A and powder B fall into the mixing chamber 7. The powder A and powder B are mixed by the rotating stirring fan blade 11. After the mixing is completed, the mixing chamber 7 rotates so that the opening 71 faces downward. Then, under the action of gravity, the mixed powder falls through the mixing powder channel 123, thereby completing the overall supply of mixed powder. After the powder is supplied, it falls onto the external printing platform, where it is spread using the mounting brackets that come with the printing platform, before proceeding to the next process.

[0026] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A powder mixing apparatus for selective laser melting additive manufacturing of heterogeneous materials, comprising: The powder supply assembly, the powder mixing assembly, and the powder discharge assembly are characterized in that: The powder supply assembly includes a powder box A (1), a powder box B (2), and two powder supply control mechanisms corresponding to the powder box A (1) and the powder box B (2). The powder supply inlets of the two powder supply control mechanisms are respectively connected to the powder outlets of the powder box A (1) and the powder box B (2). The powder mixing assembly includes a powder mixing seat (6), a powder mixing chamber (7), a chamber driving mechanism, and a powder mixing stirring mechanism. The powder mixing seat (6) has a powder mixing chamber (61), and the upper part of the powder mixing chamber (61) is connected to the powder supply outlets of the two powder supply control mechanisms. The lower part of the powder mixing chamber (61) is connected to the powder discharge nozzle (12) in the powder discharge assembly. The powder discharge nozzle (12) includes a powder A channel (121), a powder B channel (122), and a powder mixing channel (123). The mixing chamber (7) is located inside the mixing cavity (61). An opening (71) is provided on the mixing chamber (7). A mixing chamber partition (72) is provided on the side of the mixing chamber (7) facing away from the opening (71). The chamber body driving mechanism is provided on the mixing seat (6) and its output end extends into the mixing cavity (61) and is driven to connect with the mixing chamber (7). It is used to drive the mixing chamber (7) to rotate so that the opening (71) switches between facing up and facing down. The powder mixing mechanism includes a mixing part and a mixing drive part. The mixing part is located in the powder mixing chamber (7). The mixing drive part is set on the powder mixing seat (6) and its output end extends into the powder mixing chamber (7) and is connected to the mixing part for driving the mixing part to mix. When mixed powder needs to be supplied, the chamber drive mechanism causes the opening (71) to face upward, and the powder supply outlets of the two powder supply control mechanisms are connected to the powder mixing chamber (7) to supply powder A and powder B. Then, the stirring drive unit drives the stirring unit to stir the powder in the powder mixing chamber (7). After stirring is completed, the chamber drive mechanism causes the opening (71) to face downward and connect to the powder mixing channel (123) to supply mixed powder. When powder A and powder B are supplied respectively, the silo drive mechanism causes the opening (71) to face downwards and the mixing silo partition (72) to face upwards. At this time, the mixing silo partition (72) is located between the powder supply outlets of the two powder supply control mechanisms. The powder supply outlet of the powder supply control mechanism corresponding to powder A box (1) is connected to the powder A channel (121), and the powder supply outlet of the powder supply control mechanism corresponding to powder B box (2) is connected to the powder B channel (122).

2. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 1, characterized in that: The powder supply control mechanism includes a base (3), a powder supply servo motor (4), and a powder supply roller shaft (5). The base (3) corresponding to the A powder box (1) is installed at the powder outlet of the A powder box (1), and the base (3) corresponding to the B powder box (2) is installed at the powder outlet of the B powder box (2). The base (3) has a base cavity (31). The powder supply inlet of the base cavity (31) corresponding to the A powder box (1) is connected to the powder outlet of the A powder box (1), and the powder supply inlet of the base cavity (31) corresponding to the B powder box (2) is connected to the powder outlet of the B powder box (2). The powder supply servo motor (4) is installed on the corresponding base (3). The powder supply roller shaft (5) is located in the base cavity (31). The output end of the powder supply servo motor (4) extends into the corresponding base cavity (31) and connects to the powder supply roller shaft (5). Several splines are evenly provided on the powder supply roller shaft (5).

3. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 2, characterized in that: The powder mixing seat (6) is installed at the powder supply outlet of the seat cavity (31) corresponding to powder box A (1) and the seat cavity (31) corresponding to powder box B (2). The upper part of the powder mixing cavity (61) is connected to the powder supply outlet of the seat cavity (31) corresponding to powder box A (1) and the powder supply outlet of the seat cavity (31) corresponding to powder box B (2), respectively.

4. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 1, characterized in that: The chamber drive mechanism includes a pneumatic swing table (8), which is mounted on the powder mixing seat (6) and its output end extends into the powder mixing chamber (61) and is driven to connect with the powder mixing chamber (7).

5. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 4, characterized in that: The stirring drive unit includes a stirring servo motor (9), which is mounted on the powder mixing seat (6).

6. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 5, characterized in that: The stirring unit includes a stirring shaft (10) and stirring blades (11). The stirring blades (11) are disposed on the outer periphery of the stirring shaft (10). The stirring shaft (10) is located inside the powder mixing chamber (7). The output end of the stirring servo motor (9) extends into the powder mixing chamber (7) and is connected to the stirring shaft (10).

7. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 1, characterized in that: The A powder box (1) is provided with an A powder inlet (14), and the B powder box (2) is provided with a B powder inlet (15).

8. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 1, characterized in that: The A powder box (1) is provided with an A powder observation window (16), and the B powder box (2) is provided with a B powder observation window (17).

9. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 1, characterized in that: The A powder box (1) is equipped with an A powder level gauge (18).

10. The powder mixing device for selective laser melting additive manufacturing of heterogeneous materials according to claim 1, characterized in that: The B powder box (2) is equipped with a B powder level gauge (19).

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