Powder mixing device for selective laser melting additive manufacturing of heterogeneous materials

Abstract

The invention discloses a powder mixing device for selective laser melting additive manufacturing of heterogeneous materials, which belongs to the technical field of additive manufacturing and comprises a powder supply component, a powder mixing component and a powder falling component. Powder supply outlets of the two powder supply amount control mechanisms communicate with the powder mixing bin to supply powder A and powder B, then the stirring driving part drives the stirring part to stir powder in the powder mixing bin, and after stirring is completed, the opening faces downwards and communicates with the mixed powder channel to supply mixed powder. When powder A and powder B are supplied respectively, the bin body driving mechanism enables the opening to face downwards, the powder supply outlet of the powder supply amount control mechanism corresponding to the powder A box is communicated with the powder A channel, and the powder supply outlet of the powder supply amount control mechanism corresponding to the powder B box is communicated with the powder B channel.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to a powder mixing device for additive manufacturing of heterogeneous materials by laser selective melting. Background Art

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

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

[0004] Heterogeneous material selective laser melting additive manufacturing technology integrates multiple materials into one part according to structural and functional requirements. It has higher design freedom in material composition, shape structure and macroscopic performance. It can deposit different materials at any position of the component through precise adjustment, and can produce special customized parts according to environmental and structural requirements. It breaks through many limitations of traditional multi-material preparation technology and is suitable for the preparation of parts with complex functions and structures. It has low production cost 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 achieving the mixing of the two metal powders, combined with the separate powder falling control of the two powders and the powder falling control of the mixed powder, the components of the two metal powders or the mixed powder can be selected according to needs to achieve the purpose of adding powders of heterogeneous materials.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a powder mixing device for additive manufacturing of heterogeneous materials by laser selective melting, comprising: a powder supply component, a powder mixing component and a powder dropping component; The powder supply assembly includes an A powder box, a B powder box, and two powder supply quantity control mechanisms corresponding to the A powder box and the B powder box, the powder supply inlets of the two powder supply quantity control mechanisms are respectively connected to the powder outlets of the A powder box and the B powder box, the powder mixing assembly includes a powder mixing seat, a powder mixing bin, a bin driving mechanism, and a powder mixing stirring mechanism, a powder mixing chamber is provided in the powder mixing seat, and the upper part of the powder mixing chamber is respectively connected to the powder supply outlets of the two powder supply quantity control mechanisms, and the lower part of the powder mixing chamber is connected to the powder dropping nozzle in the powder dropping assembly, and the powder dropping nozzle includes an A powder channel, a B powder channel, and a mixed powder channel; The powder mixing bin is located in the powder mixing chamber, an opening is provided on the powder mixing bin, a powder mixing bin partition is provided on the outer side of the powder mixing bin facing away from the opening, the bin body driving mechanism is provided on the powder mixing seat, and the output end extends into the powder mixing chamber and is drivingly connected to the powder mixing bin, so as to drive the powder mixing bin to flip so that the opening is switched between facing upward and facing downward; The powder mixing and stirring mechanism comprises a stirring part and a stirring driving part, wherein the stirring part is located in the powder mixing bin, and the stirring driving part is arranged on the powder mixing seat and has an output end extending into the powder mixing bin and drivingly connected to the stirring part to drive the stirring part to stir; When mixed powder needs to be supplied, the bin driving mechanism makes the opening face upward, and the powder supply outlets of the two powder supply quantity control mechanisms are connected to the mixed powder bin to supply powder A and powder B. Then the stirring driving part drives the stirring part to stir the powder in the mixed powder bin. After the stirring is completed, the bin driving mechanism makes the opening face downward and connect to the mixed powder channel to supply the mixed powder. When powder A and powder B are supplied respectively, the bin driving mechanism makes the opening face downward and the mixing bin partition face upward. At this time, the mixing bin partition is located between the two powder supply outlets of the powder supply quantity control mechanism, and the powder supply outlet of the powder supply quantity control mechanism corresponding to the A powder box is connected to the A powder channel, and the powder supply outlet of the powder supply quantity control mechanism corresponding to the B powder box is connected to the B powder channel.

[0007] As a preferred technical solution of the present invention, the powder supply quantity control mechanism includes a seat body, a powder supply servo motor and a powder supply roller shaft. The seat body corresponding to the A powder box is installed at the powder outlet position of the A powder box, and the seat body corresponding to the B powder box is installed at the powder outlet position of the B powder box. A seat body cavity is opened in the seat body, and the powder supply inlet of the seat body cavity corresponding to the A powder box is connected with the powder outlet of the A powder box, and the powder supply inlet of the seat body cavity corresponding to the B powder box is connected with the powder outlet of the B powder box. The powder supply servo motor is installed on the corresponding seat body, and the powder supply roller shaft is located in the seat body cavity. The output end of the powder supply servo motor extends into the corresponding seat body cavity and is connected to the powder supply roller shaft, and a plurality of splines are evenly opened on the powder supply roller shaft.

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

[0009] As a preferred technical solution of the present invention, the bin driving mechanism includes a pneumatic swing table, which is arranged on the powder mixing seat and has an output end extending into the powder mixing chamber to be drivingly connected to the powder mixing bin.

[0010] As a preferred technical solution of the present invention, the stirring driving part includes a stirring servo motor, and the stirring servo motor is arranged on the powder mixing seat.

[0011] As a preferred technical solution of the present invention, the stirring part includes a stirring shaft and stirring blades, the stirring blades are arranged on the outer periphery of the stirring shaft, the stirring shaft is located in the powder mixing bin, and the output end of the stirring servo motor extends into the powder mixing bin and is connected to the stirring shaft.

[0012] As a preferred technical solution 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 technical solution 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 technical solution of the present invention, an A powder level meter is provided on the A powder box.

[0015] As a preferred technical solution of the present invention, a B powder level meter is provided on the B powder box.

[0016] The beneficial effects of the present invention are embodied in: By setting a powder supply control mechanism corresponding to powder box A and a powder supply control mechanism corresponding to powder box B, the supply of powder A and powder B can be controlled respectively; by setting a powder mixing and stirring mechanism in cooperation with the powder mixing bin, powder A and powder B can be mixed; by setting a bin driving mechanism in cooperation with the powder mixing bin, when powder mixing is needed, the powder mixing bin cooperates with the powder mixing and stirring mechanism to complete the powder mixing, so that the opening of the powder mixing bin faces downward, so that the mixed powder passes through the downward opening of the powder mixing bin and falls from the mixed powder channel, thereby realizing the supply of mixed powder; when powder A or powder B is needed respectively, the opening of the powder mixing bin faces downward, and under the guidance of the outer wall of the powder mixing bin, powder A falls from the powder A channel, and powder B falls from the powder B channel The powder mixes and falls in a powder mixing bin, and cooperates with the powder mixing bin partition to guide powder A and powder B respectively on the outer wall of the powder mixing bin to avoid mixing powder A and powder B, thereby ensuring the purity of powder when powder A and powder B are supplied separately. In the above process, the needs of layered printing of two different powders and one mixed powder can be met, and alternating layered printing of single powder and layered printing of online mixed powder with variable proportion can be realized. It can have higher design freedom in materials, structures, etc., and can be deposited at the required position of the component through different materials or their different proportions. Customized parts can be realized according to actual needs. It is suitable for preparing parts with complex functions and structures, with low production cost and excellent performance. It is the most ideal forming solution for high-performance parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the structure of the powder supply component and other parts of the present invention; Figure 3 It is a front view schematic diagram of the powder supply assembly and other parts of the present invention; Figure 4 It is a side cross-sectional schematic diagram of the powder supply assembly and other parts of the present invention; Figure 5 It is a cross-sectional schematic diagram of the seat body and other parts of the present invention; Figure 6 is a schematic diagram of a powder mixing assembly of the present invention; Figure 7 It is a cross-sectional schematic diagram of the powder mixing assembly and other parts of the present invention; Figure 8 It is a schematic diagram of the powder mixing bin of the present invention; Fig. 9 It is a cross-sectional schematic diagram of the powder mixing bin of the present invention; Fig.10 It is a schematic diagram of the stirring portion of the present invention; Fig.11 is a front view schematic diagram of the stirring portion of the present invention; Fig.12 is a schematic diagram of a powder dropping assembly of the present invention; Fig.13 It is a cross-sectional schematic diagram of the powder mixing seat and other parts of the present invention; Fig.14 It is a cross-sectional schematic diagram of the powder mixing seat and the powder dropping nozzle of the present invention.

[0018] In the figure: 1. A powder box; 2. B powder box; 3. seat; 31. seat cavity; 4. powder supply servo motor; 5. powder supply roller shaft; 6. powder mixing seat; 61. powder mixing cavity; 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. A powder channel; 122. B powder channel; 123. mixed powder channel; 124. mixed powder channel partition; 13. powder drop mounting seat; 14. A powder inlet; 15. B powder inlet; 16. A powder observation window; 17. B powder observation window; 18. A powder level meter; 19. B powder level meter. DETAILED DESCRIPTION

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

[0020] Combined with Figure 1-14 As shown, a powder mixing device for laser selective melting additive manufacturing of heterogeneous materials includes an A powder box 1, a B powder box 2, a seat 3, a seat cavity 31, a powder supply servo motor 4, a powder supply roller shaft 5, a powder mixing seat 6, a powder mixing cavity 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 meter 18 and a B powder level meter 19.

[0021] Combined with Figure 1-14As shown, a powder mixing device for additive manufacturing of heterogeneous materials by laser selective melting includes: a powder supply component, a powder mixing component and a powder dropping 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 the powder box A 1 and the powder box B 2, the powder supply inlets of the two powder supply quantity control mechanisms are respectively connected to the powder outlets of the powder box A 1 and the powder box B 2, specifically, the powder supply quantity control mechanism includes a seat body 3, a powder supply servo motor 4 and a powder supply roller shaft 5, the seat body 3 corresponding to the powder box A 1 is installed at the powder outlet position of the powder box A 1, the seat body 3 corresponding to the powder box B 2 is installed at the powder outlet position of the powder box B 2, a seat body cavity 31 is opened in the seat body 3, and the powder supply inlet of the seat body cavity 31 corresponding to the powder box A 1 is connected to the powder outlet of the powder box A 1 The powder outlet is connected with the powder supply inlet of the seat cavity 31 corresponding to the B powder box 2 and the powder outlet of the B powder box 2. The powder supply servo motor 4 is installed on the corresponding seat 3. The powder supply roller shaft 5 is located in the seat cavity 31. The output end of the powder supply servo motor 4 extends into the corresponding seat cavity 31 and is connected with the powder supply roller shaft 5. A number of splines are evenly provided on the powder supply roller shaft 5. Preferably, the seat 3 consists of an upper and lower part, which are spliced ​​to form the seat 3 by bolt fixing. The powder supply servo motor 4 is connected with the powder supply roller shaft 5 through a coupling. The powder supply roller shaft 5 is installed in the seat cavity 31 through a rolling bearing. The powder mixing assembly includes a powder mixing seat 6, a powder mixing bin 7, a bin driving mechanism and a powder mixing stirring mechanism. A powder mixing cavity 61 is provided in the powder mixing seat 6, and the powder mixing The upper part of the cavity 61 is communicated with the powder supply outlets of two powder supply control mechanisms respectively. Specifically, the powder mixing seat 6 is installed at the powder supply outlet positions of the seat cavity 31 corresponding to the A powder box 1 and the seat cavity 31 corresponding to the B powder box 2. The upper part of the powder mixing cavity 61 is communicated with the powder supply outlet of the seat cavity 31 corresponding to the A powder box 1 and the powder supply outlet of the seat cavity 31 corresponding to the B powder box 2 respectively. The lower part of the powder mixing cavity 61 is communicated with the powder dropping nozzle 12 in the powder dropping component. Specifically, the powder dropping component also includes a powder dropping mounting seat 13. The powder dropping nozzle 12 is installed below the powder mixing seat 6 through the powder dropping mounting seat 13. The powder dropping nozzle 12 includes an A powder channel 121, a B powder channel 122 and a mixed powder channel 123. Specifically, the A powder box 1 is provided with an A powder inlet 14. The B powder box 2 is provided with a B powder inlet 15, the A powder box 1 is provided with an A powder observation window 16, the B powder box 2 is provided with a B powder observation window 17, the A powder box 1 is provided with an A powder level meter 18, and the B powder box 2 is provided with a B powder level meter 19. Preferably, the B powder level meter 18 and the B powder level meter 19 are both material level meters, and the sensors of the material level meters are used to monitor the amount of metal powder, and the A powder inlet 14 is used to add A powder to the A powder box 1, and the B powder inlet 15 is used to add B powder to the B powder box 2. The situation in the A powder box 1 is observed through the A powder observation window 16, and the situation in the B powder box 2 is observed through the B powder observation window 17. The A powder level meter 18 is used to warn the A powder stock in the A powder box 1.The B powder level meter 19 is used to warn the B powder stock 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, and falls into the corresponding spline of the powder supply roller shaft 5 through the spline on the powder supply roller shaft 5. Then, the powder supply roller shaft 5 is driven to rotate by the powder supply servo motor 4, 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, when the spline containing A powder moves to the powder supply outlet position of the seat cavity 31, When A powder is supplied, it falls into the powder mixing chamber 61 through the corresponding powder supply outlet. Similarly, when B powder is supplied, B powder is supplied through the corresponding powder supply servo motor 4 and the corresponding powder supply roller shaft 5, so that B powder falls into the powder mixing chamber 61 through the corresponding powder supply outlet of the seat cavity 31. Since the specifications of the spline are known in advance, and the splines are evenly arranged on the powder supply roller shaft 5, the powder supply amount of the corresponding metal powder can be controlled by the number of rotations of the powder supply roller shaft 5, so as to achieve the purpose of accurately controlling the powder supply amount.

[0022] Combined with Figure 1-9 As shown, the powder mixing bin 7 is located in the powder mixing chamber 61, an opening 71 is provided on the powder mixing bin 7, and a powder mixing bin partition 72 is provided on the outer side of the powder mixing bin 7 facing away from the opening 71. Preferably, the angle between the two side lines along the axis of the opening 71 and the shortest distance connecting the axis of the powder mixing bin 7 is 96°, and the bin body driving mechanism is provided on the powder mixing seat 6 and the output end extends into the powder mixing chamber 61 and is drivingly connected to the powder mixing bin 7, so as to drive the powder mixing bin 7 to flip so that the opening 71 is switched between upward and downward. Specifically, the bin body driving mechanism includes a pneumatic swing table 8, which is provided on the powder mixing seat 6 and the output end extends into the powder mixing chamber 61 and is drivingly connected to the powder mixing bin 7. By providing the pneumatic swing table 8, the powder mixing bin 7 can be driven to rotate.

[0023] Combined with Figure 1-14 As shown, the powder mixing and stirring mechanism includes a stirring part and a stirring drive part, the stirring part is located in the powder mixing bin 7, the stirring drive part is arranged on the powder mixing seat 6 and the output end extends into the powder mixing bin 7 and is driven and connected to the stirring part for driving the stirring part to stir. Specifically, the stirring drive part includes a stirring servo motor 9, the stirring servo motor 9 is arranged on the powder mixing seat 6, the stirring part includes a stirring shaft 10 and a stirring fan blade 11, the stirring fan blade 11 is arranged on the periphery of the stirring shaft 10, the stirring shaft 10 is located in the powder mixing bin 7, the output end of the stirring servo motor 9 extends into the powder mixing bin 7 and is connected to the stirring shaft 10, preferably, the stirring shaft 10 is installed in the powder mixing bin 7 through a corresponding stirring shaft rolling bearing, the stirring servo motor 9 is connected to the stirring shaft 10 through a key, the stirring fan blade 11 adopts a double helix structure, and the stirring shaft 10 is driven to rotate by the stirring servo motor 9, and under the action of the stirring fan blade 11 with the double helix structure, the metal powder can be mixed more evenly.

[0024] Combined with Figure 1-14 As shown, when it is necessary to supply mixed powder, the bin driving mechanism makes the opening 71 face upward, and the powder supply outlets of the two powder supply control mechanisms are connected to the mixed powder bin 7 to supply A powder and B powder. Then the stirring driving part drives the stirring part to stir the powder in the mixed powder bin 7. After the stirring is completed, the bin driving mechanism makes the opening 71 face downward and connect with the mixed powder channel 123 to supply the mixed powder. Specifically, when supplying the mixed powder, firstly, the A powder passes through the powder supply servo motor 4 and the powder supply roller shaft 5 corresponding to the A powder, and is supplied according to the required supply amount. Similarly, the B powder is supplied according to the required supply amount. The pneumatic swing table 8 makes the opening 71 of the powder mixing bin 7 face upward, and the A powder and the B powder fall into the powder mixing bin 7. Then, the stirring shaft 10 is driven to rotate by the stirring servo motor 9 to mix the A powder and the B powder. After the mixing of the A powder and the B powder is completed, the pneumatic swing table 8 drives the powder mixing bin 7 to rotate, so that the powder mixing bin 7 is turned 180 degrees, and the opening 71 faces downward. Under the action of gravity, the mixed metal powder in the powder mixing bin 7 falls through the mixed powder channel 123. Preferably, the mixed powder channel extends to the powder mixing chamber 61 with a mixed powder channel partition 124 to ensure that the mixed powder does not leak from the A powder channel or the B powder channel. When supplying A powder and B powder respectively, the bin driving mechanism makes the opening 71 face downward and the mixing bin partition 72 face upward. At this time, the mixing bin 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 the A powder box 1 is connected to the A powder channel 121, and the powder supply outlet of the powder supply control mechanism corresponding to the B powder box 2 is connected to the B powder channel 122. Specifically, when supplying A powder or B powder, the pneumatic swing table 8 makes the opening 71 of the mixing powder bin 7 face downward, the mixing powder bin partition 72 faces upward and is located between the powder supply outlet corresponding to A powder and the powder supply outlet corresponding to B powder. Then A powder or B powder starts to be supplied. Under the guidance of the outer wall of the mixing powder bin 7, A powder falls through the A powder channel 121, and B powder falls through the B powder channel 122.

[0025] Working principle: Taking the printing format of 250×250mm as an example, the powder is spread 3.04mm at a time, including 3mm powder absorption layer thickness and 0.04mm powder spreading layer thickness. The amount of powder required at a time is ≈0.2L, which is about 18mm at the bottom of the powder mixing bin 7. By adopting this component space design, the powder can be fully stirred and the powder can be placed at the lower position of the powder mixing bin 7, thereby reducing dust. When double printing is performed, that is, when printing with powder A or powder B, the pneumatic swing table 8 makes the opening 71 face downward to control the supply of powder A or powder B. Powder A moves through the outer wall of the powder mixing bin 7 and falls through the powder A channel 121, and powder B is guided by the outer wall of the powder mixing bin 7 and falls through the powder B channel 122, thereby completing the overall supply of powder A or powder B. After the powder is supplied, the supplied powder falls onto the external printing platform, and the powder is spread with the help of the hooks provided by the printing platform, and then the next process is entered; When mixed powder printing is performed, the supply of A powder and B powder is controlled according to the mixed powder ratio of A powder and B powder. At this time, the pneumatic swing table 8 makes the opening 71 face upward, and the supplied A powder and B powder fall into the mixed powder bin 7. The A powder and B powder are mixed with the help of the rotating stirring blades 11. After the powder mixing is completed, the mixed powder bin 7 rotates so that the opening 71 faces downward. Then, under the action of gravity, the mixed powder falls through the mixed powder channel 123, thereby completing the overall supply of the mixed powder. After the powder is supplied, it falls onto the external printing platform, and the powder is spread with the help of the hook provided on the printing platform, and then the next process is entered.

[0026] The above shows and describes 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 by the above embodiments. The above embodiments and the description in the specification are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A powder mixing device for additive manufacturing of heterogeneous materials by laser selective melting, comprising: The powder supply component, the powder mixing component and the powder dropping component are characterized by: The powder supply component comprises an A powder box (1), a B powder box (2) and two powder supply quantity control mechanisms corresponding to the A powder box (1) and the B powder box (2), the powder supply inlets of the two powder supply quantity control mechanisms being respectively connected to the powder outlets of the A powder box (1) and the B powder box (2), the powder mixing component comprises a powder mixing seat (6), a powder mixing bin (7), a bin driving mechanism and a powder mixing stirring mechanism, a powder mixing chamber (61) is provided in the powder mixing seat (6), and the upper part of the powder mixing chamber (61) is respectively connected to the powder supply outlets of the two powder supply quantity control mechanisms, the lower part of the powder mixing chamber (61) is connected to a powder dropping nozzle (12) in the powder dropping component, and the powder dropping nozzle (12) comprises an A powder channel (121), a B powder channel (122) and a mixed powder channel (123); The powder mixing bin (7) is located in the powder mixing chamber (61), an opening (71) is provided on the powder mixing bin (7), a powder mixing bin partition (72) is provided on the outer side of the powder mixing bin (7) facing away from the opening (71), the bin body driving mechanism is provided on the powder mixing seat (6), and the output end extends into the powder mixing chamber (61) and is drivingly connected to the powder mixing bin (7), and is used to drive the powder mixing bin (7) to flip so that the opening (71) is switched between facing upward and facing downward; The powder mixing and stirring mechanism comprises a stirring portion and a stirring driving portion, wherein the stirring portion is located in the powder mixing bin (7), and the stirring driving portion is arranged on the powder mixing seat (6) and has an output end extending into the powder mixing bin (7) and drivingly connected to the stirring portion for driving the stirring portion to perform stirring; When mixed powder needs to be supplied, the bin driving mechanism causes the opening (71) to face upward, and the powder supply outlets of the two powder supply quantity control mechanisms are both connected to the mixed powder bin (7) to supply powder A and powder B. Subsequently, the stirring driving unit drives the stirring unit to stir the powder in the mixed powder bin (7). After the stirring is completed, the bin driving mechanism causes the opening (71) to face downward and communicate with the mixed powder channel (123) to supply the mixed powder. When supplying powder A and powder B respectively, the bin driving mechanism makes the opening (71) face downward and the mixing bin partition (72) face upward. At this time, the mixing bin partition (72) is located between the powder supply outlets of the two powder supply quantity control mechanisms. The powder supply outlet of the powder supply quantity control mechanism corresponding to the A powder box (1) is connected to the A powder channel (121), and the powder supply outlet of the powder supply quantity control mechanism corresponding to the B powder box (2) is connected to the B powder channel (122).

2. The device for mixing powders for additive manufacturing of heterogeneous materials by laser selective melting according to claim 1, characterized in that: The powder supply quantity control mechanism comprises a seat body (3), a powder supply servo motor (4) and a powder supply roller shaft (5); the seat body (3) corresponding to the A powder box (1) is installed at the powder outlet position of the A powder box (1); the seat body (3) corresponding to the B powder box (2) is installed at the powder outlet position of the B powder box (2); a seat body cavity (31) is provided in the seat body (3); the powder supply inlet of the seat body cavity (31) corresponding to the A powder box (1) is communicated with the powder outlet of the A powder box (1); the powder supply inlet of the seat body cavity (31) corresponding to the B powder box (2) is communicated with the powder outlet of the B powder box (2); the powder supply servo motor (4) is installed on the corresponding seat body (3); the powder supply roller shaft (5) is located in the seat body cavity (31); the output end of the powder supply servo motor (4) extends into the corresponding seat body cavity (31) and is connected to the powder supply roller shaft (5); and a plurality of splines are evenly provided on the powder supply roller shaft (5).

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

4. The device for mixing powders for additive manufacturing of heterogeneous materials by laser selective melting according to claim 1, characterized in that: The bin driving mechanism comprises a pneumatic swing table (8), which is arranged on the powder mixing seat (6) and has an output end extending into the powder mixing chamber (61) and is drivingly connected to the powder mixing bin (7).

5. The device for mixing powders for additive manufacturing of heterogeneous materials by laser selective melting according to claim 4 is characterized by: The stirring drive unit comprises a stirring servo motor (9), and the stirring servo motor (9) is arranged on the powder mixing seat (6).

6. The device for mixing powders for additive manufacturing of heterogeneous materials by laser selective melting according to claim 5, characterized in that: The stirring portion comprises a stirring shaft (10) and stirring blades (11), wherein the stirring blades (11) are arranged on the periphery of the stirring shaft (10), the stirring shaft (10) is located in the powder mixing bin (7), and the output end of the stirring servo motor (9) extends into the powder mixing bin (7) and is connected to the stirring shaft (10).

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

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

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