Non-contact bidirectional powder laying method and device for additive manufacturing

Abstract

The invention provides a non-contact two-way powder laying method and device for additive manufacturing, and belongs to the technical field of additive manufacturing, and the non-contact two-way powder laying device comprises a forming platform, a linear moving module, a first powder laying module, a first powder suction module, a second powder laying module and a second powder suction module. The forming device has the beneficial effects that after the forming platform descends to pre-lay the layer thickness, the first powder laying module and the first powder suction module move towards the first direction at the same time and are started at the same time, and a flat first material powder layer is formed on a first powder laying material and a first powder suction material; and after laser scanning, a second powder laying module and a second powder suction module move towards a second direction at the same time, and a flat second material powder layer is formed on a second powder laying material and a second powder suction material at the same time, so that rapid powder laying of the two materials is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of additive manufacturing, and relates to a non-contact bidirectional powder spreading method and device for additive manufacturing. Background Art

[0002] Metal additive manufacturing technology uses high-power or high-brightness lasers as heat sources to melt metal powder or wire layer by layer to directly produce parts of any complex shape. Taking SLM technology as an example, the powder material is pre-spread on the forming platform, and a high-power laser is used to melt the metal powder layer by layer according to a pre-planned scanning path trajectory, and the layers are stacked to directly form parts.

[0003] Multi-material laser powder bed fusion technology is a new type of metal additive manufacturing technology. It breaks through the limitation of traditional additive manufacturing technology that can only prepare a single material. It can deposit a variety of heterogeneous materials at any position of the component. It has higher design freedom in composition and performance. It is an ideal forming technology for the rapid production of multi-material, high-performance parts.

[0004] Currently, the biggest challenge of multi-material laser powder bed fusion process is how to achieve the powder laying of multiple heterogeneous materials. Conventional powder laying methods do not support the laying of two or more powder materials in one forming chamber.

[0005] The multi-material powder laying process in the existing technology involves two steps: removing heterogeneous powder and re-laying powder. The powder laying time is long, the material transition zone is difficult to control, and the more types of laid powder, the more steps of removing heterogeneous powder and re-laying powder increase exponentially, leaving much room for improvement. Summary of the invention

[0006] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a non-contact bidirectional powder spreading method and device for additive manufacturing.

[0007] The object of the present invention can be achieved by the following technical solution: A non-contact bidirectional powder spreading method for additive manufacturing, comprising the steps of:

[0008] S1: the forming platform reduces the pre-laying thickness based on the original thickness, and the first powder dropping module and the first powder suction module move in the first direction at the same time;

[0009] S2: The first powder dropping module and the first powder suction module are turned on at the same time. The first powder dropping module drops the first material on the original powder layer. The first powder suction module simultaneously recovers the powder whose thickness exceeds the sum of the original thickness and the pre-laid layer thickness, so that a flat first material powder layer is formed on the forming platform, and the laying of the first material is completed;

[0010] S3: The laser performs a selective scanning on the first material powder layer;

[0011] S4: the second powder dropping module and the second powder suction module move simultaneously in a second direction opposite to the first direction;

[0012] S5: The second powder dropping module and the second powder suction module are turned on at the same time. The second powder dropping module drops the second material on the original powder layer. The second powder suction module simultaneously recovers the powder whose thickness exceeds the first material powder layer, so that a flat second material powder layer is formed on the forming platform, and the laying of the second material is completed.

[0013] S6: The laser performs a selective scanning on the second material powder layer;

[0014] S7: Repeat S1 to S6 until the processing is completed.

[0015] In the above-mentioned non-contact bidirectional powder spreading method for additive manufacturing, in step S2, the second powder suction module is turned on at the same time, and before the first powder dropping module drops the first material on the original powder layer, the second powder suction module is used to remove excess raw material; in step S5, the first powder suction module is turned on at the same time, and before the second powder dropping module drops the second material on the original powder layer, the first powder suction module is used to remove excess first material.

[0016] In the above-mentioned non-contact bidirectional powder spreading method for additive manufacturing, in step S2, the first material dropped by the first powder dropping module is pre-leveled by the first scraping knife seat between the first powder dropping module and the first powder suction module; in step S5, the second material dropped by the second powder dropping module is pre-leveled by the second scraping knife seat between the second powder dropping module and the second powder suction module.

[0017] Secondly, a non-contact bidirectional powder spreading device for additive manufacturing, comprising:

[0018] Forming platform;

[0019] A linear moving module connected to the forming platform, wherein the linear moving module is provided with a bracket, and the linear moving module can drive the bracket to move relative to the forming platform;

[0020] A first powder dropping module, comprising a first powder dropping seat, a first powder dropping shaft and a first powder bin, wherein the first powder dropping seat is connected to the bracket, the first powder bin is connected to the first powder dropping seat, and the first powder dropping shaft is rotatably connected to the first powder dropping seat;

[0021] A first powder suction module comprises a first powder suction seat and a first fan, wherein the first powder suction seat is connected to the bracket, the first powder suction seat is connected to the first fan, and the first fan can drive the first powder suction seat to suck powder;

[0022] A second powder dropping module, comprising a second powder dropping seat, a second powder dropping shaft and a second powder bin, wherein the second powder dropping seat is connected to the bracket, the second powder bin is connected to the second powder dropping seat, and the second powder dropping shaft is rotatably connected to the second powder dropping seat;

[0023] The second powder suction module comprises a second powder suction seat and a second fan, wherein the second powder suction seat is connected to the bracket, the second powder suction seat is connected to the second fan, and the second fan can drive the second powder suction seat to suck powder.

[0024] In the above-mentioned non-contact bidirectional powder spreading device for additive manufacturing, the first powder dropping module also includes a first reducer and a first motor, the first reducer and the first motor are fixed relative to the first powder dropping seat, the first powder dropping shaft is connected to the first motor through the first reducer, and the first motor can drive the first powder dropping shaft to rotate through the first reducer, and the second powder dropping module also includes a second reducer and a second motor, the second reducer and the second motor are fixed relative to the second powder dropping seat, the second powder dropping shaft is connected to the second motor through the second reducer, and the second motor can drive the second powder dropping shaft to rotate through the second reducer.

[0025] In the above-mentioned non-contact bidirectional powder spreading device for additive manufacturing, the first powder suction module also includes a first filter, the first filter is located between the first powder suction seat and the first fan, and the first powder suction seat is connected to the first fan through the first filter, and the second powder suction module also includes a second filter, the second filter is located between the second powder suction seat and the second fan, and the second powder suction seat is connected to the second fan through the second filter.

[0026] In the above-mentioned non-contact bidirectional powder spreading device for additive manufacturing, the first powder suction module also includes a first collector and a first powder collecting bottle, the first collector is located between the first powder suction seat and the first filter, the first powder suction seat is connected to the first filter through the first collector, and the first powder collecting bottle is connected to the first collector, the second powder suction module also includes a second collector and a second powder collecting bottle, the second collector is located between the second powder suction seat and the second filter, the second powder suction seat is connected to the second filter through the second collector, and the second powder collecting bottle is connected to the second collector.

[0027] In the above-mentioned non-contact bidirectional powder spreading device for additive manufacturing, the first powder suction module also includes a first anemometer, which is connected to the first fan and used to detect the wind speed of the first fan, and the second powder suction module also includes a second anemometer, which is connected to the second fan and used to detect the wind speed of the second fan.

[0028] In the above-mentioned non-contact bidirectional powder spreading device for additive manufacturing, the first powder suction seat is provided with a first scraping knife seat, and the first scraping knife seat is arranged on the side of the first powder suction seat close to the bracket, and the second powder suction seat is provided with a second scraping knife seat, and the second scraping knife seat is arranged on the side of the second powder suction seat close to the bracket.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. After the forming platform descends and the pre-layer thickness is laid, the first powder dropping module and the first powder suction module are simultaneously moved in the first direction and opened to drop the first material and to suction the first material to form a flat powder layer of the first material. After laser scanning, the second powder dropping module and the second powder suction module are simultaneously moved in the second direction and opened to drop the second material and to suction the second material to form a flat powder layer of the second material, thereby realizing rapid powder dropping of the two materials.

[0031] 2. Before the first powder dropping module drops the first material on the original powder layer, the second powder suction module first removes excess raw materials, which can suck away unnecessary raw materials in advance to prevent the raw materials from interfering with the first material, so that the laying of the first material cannot achieve the expected effect; before the second powder dropping module drops the second material on the original powder layer, the first powder suction module first removes excess first material, which can suck away unnecessary first material in advance to prevent the first material from interfering with the second material, so that the laying of the second material cannot achieve the expected effect.

[0032] 3. Through two sets of powder suction modules, the laying of materials and the removal of excess raw materials can be completed simultaneously in the same direction, effectively improving the powder laying efficiency of multiple materials.

[0033] 4. When the fan starts working, negative pressure is generated at the powder suction seat. The powder near the powder suction seat is sucked in under the action of negative pressure and enters the collector through the pipeline. Relying on the structural characteristics of the collector, the powder rotates downward along the cylinder wall and falls into the powder collecting bottle. The gas enters the fan along the outlet of the collector.

[0034] 5. The first anemometer can detect the wind speed of the first fan and monitor the wind speed change of the first fan in real time to adjust the output frequency of the first fan. The second anemometer can detect the wind speed of the second fan and monitor the wind speed change of the second fan in real time to adjust the output frequency of the second fan.

[0035] 6. A scraper seat is provided on the side of the powder suction port close to the bracket. As the bracket moves, the powder is pre-leveled before the powder suction seat sucks the powder, which effectively improves the powder suction accuracy.

[0036] 7. The non-contact powder spreading method effectively solves the problem of powder contamination between multiple materials caused by direct contact between the scraper and the powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the action of step S2 of the non-contact bidirectional powder spreading device for additive manufacturing of the present invention.

[0038] Figure 2 It is a schematic diagram of the action of step S5 of the non-contact bidirectional powder spreading device for additive manufacturing of the present invention.

[0039] Figure 3 It is a schematic structural diagram of the non-contact bidirectional powder spreading device for additive manufacturing of the present invention.

[0040] Figure 4 It is a schematic structural diagram of the first powder dropping module and the second powder dropping module of the present invention.

[0041] Figure 5 It is a schematic structural diagram of the first powder suction module and the second powder suction module of the present invention.

[0042] In the figure, 100, forming platform; 200, linear moving module; 210, bracket; 310, first powder dropping seat; 320, first powder dropping shaft; 330, first powder bin; 340, first reducer; 350, first motor; 410, first powder suction seat; 411, first scraping knife seat; 420, first fan; 430, first filter; 440, first collector; 450, first powder collecting bottle; 460, first anemometer; 510, second powder dropping seat; 520, second powder dropping shaft; 530, second powder bin; 540, second reducer; 550, second motor; 610, second powder suction seat; 611, second scraping knife seat; 620, second fan; 630, second filter; 640, second collector; 650, second powder collecting bottle; 660, second anemometer. DETAILED DESCRIPTION

[0043] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0044] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0045] In addition, in the present invention, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0049] like Figure 1-Figure 5 As shown, a non-contact bidirectional powder spreading method for additive manufacturing comprises the steps of:

[0050] S1: the forming platform 100 decreases the pre-laying thickness H0 on the basis of the original thickness H10, and the first powder dropping module and the first powder suction module move toward the first direction at the same time;

[0051] S2: The first powder dropping module and the first powder suction module are turned on at the same time. The first powder dropping module performs powder dropping of the first material on the original powder layer. The first powder suction module simultaneously recovers the powder whose powder layer thickness exceeds the sum of the original thickness and the pre-laid layer thickness, so that the forming platform 100 forms a flat first material powder layer with a thickness of H11, H11=H10+H0, and the laying of the first material is completed;

[0052] S3: The laser performs a selective scanning on the first material powder layer;

[0053] S4: the second powder dropping module and the second powder suction module move simultaneously in a second direction opposite to the first direction;

[0054] S5: The second powder dropping module and the second powder suction module are turned on at the same time. The second powder dropping module performs powder dropping of the second material on the original powder layer. The second powder suction module simultaneously recovers the powder whose thickness exceeds the thickness of the first material powder layer, so that the forming platform 100 forms a flat second material powder layer with a thickness of H20 and H20=H11, and the laying of the second material is completed;

[0055] S6: The laser performs a selective scanning on the second material powder layer;

[0056] S7: Repeat S1 to S6 until the processing is completed.

[0057] It is worth noting here that the first material and the second material can be the same material.

[0058] It is also worth noting here that the number of the first powder dropping modules is not specifically limited, and can be adjusted according to the amount of material required to be laid in the direction, and the corresponding first powder dropping module can be opened and closed each time.

[0059] It is also worth noting here that the number of the second powder dropping modules is not specifically limited and can be adjusted according to the amount of material required to be laid in that direction, and the corresponding second powder dropping module can be opened and closed each time.

[0060] In this embodiment, after the forming platform 100 descends to the pre-laid layer thickness, it moves in the first direction through the first powder dropping module and the first powder suction module at the same time and starts to drop the first material and suction the first material to form a flat powder layer of the first material. After laser scanning, it moves in the second direction through the second powder dropping module and the second powder suction module at the same time and starts to drop the second material and suction the second material to form a flat powder layer of the second material, thereby realizing rapid powder dropping of the two materials.

[0061] like Figure 1 , Figure 2As shown, based on the above implementation, in step S2, the second powder suction module is turned on at the same time, and the first powder dropping module removes the excess raw material before dropping the first material on the original powder layer.

[0062] In this embodiment, before the first powder dropping module drops the first material on the original powder layer, the second powder suction module first removes excess raw materials, so that unnecessary raw materials can be removed in advance to prevent the raw materials from interfering with the first material, so that the laying of the first material cannot achieve the expected effect.

[0063] It is worth noting here that this implementation is for two or more materials. If the first material and the second material are the same material, this step is not necessary.

[0064] like Figure 1 , Figure 2 As shown, based on the above implementation, in step S5, the first powder suction module is turned on at the same time, and before the second powder dropping module drops the second material on the original powder layer, the first powder suction module removes the excess first material.

[0065] In this embodiment, before the second powder dropping module drops the second material on the original powder layer, the first powder suction module first removes the excess first material, so that the unnecessary first material can be removed in advance to prevent the first material from interfering with the second material, so that the laying of the second material cannot achieve the expected effect.

[0066] It is worth noting here that this implementation is for two or more materials. If the first material and the second material are the same material, this step is not necessary.

[0067] like Figure 1 , Figure 2 As shown, in step S2, the first material dropped by the first powder dropping module is pre-leveled by the first scraper seat between the first powder dropping module and the first powder suction module, thereby effectively improving the powder suction accuracy.

[0068] like Figure 1 , Figure 2 As shown, on the basis of the above implementation, in step S5, the second material dropped by the second powder dropping module is pre-leveled by the second scraper seat between the second powder dropping module and the second powder suction module, thereby effectively improving the powder suction accuracy.

[0069] It is worth explaining here that the superimposed application of the above-mentioned embodiments can realize the role switching of the first powder suction module and the second powder suction module. For example, when the first powder dropping module is dropping powder, the first powder suction module and the first scraper seat are used to make the powder spread level, and the second powder suction module is used to remove excess material; conversely, when the second powder dropping module is dropping powder, the second powder suction module and the second scraper seat are used to make the powder spread level, and the first powder suction module is used to remove excess material.

[0070] like Figure 1-Figure 5 As shown, a non-contact bidirectional powder spreading device for additive manufacturing comprises:

[0071] Forming platform 100;

[0072] A linear moving module 200 connected to the forming platform 100, wherein the linear moving module 200 is provided with a bracket 210, and the linear moving module 200 can drive the bracket 210 to move relative to the forming platform 100;

[0073] A first powder dropping module, comprising a first powder dropping seat 310, a first powder dropping shaft 320 and a first powder bin 330, wherein the first powder dropping seat 310 is connected to the bracket 210, the first powder bin 330 is connected to the first powder dropping seat 310, and the first powder dropping shaft 320 is rotatably connected to the first powder dropping seat 310;

[0074] It is also worth noting here that the number of the first powder dropping modules is not specifically limited, and can be adjusted according to the amount of material required to be laid in the direction, and the corresponding first powder dropping module can be opened and closed each time.

[0075] A first powder suction module, comprising a first powder suction seat 410 and a first fan 420, wherein the first powder suction seat 410 is connected to the bracket 210, and the first powder suction seat 410 is connected to the first fan 420, and the first fan 420 can drive the first powder suction seat 410 to suction powder;

[0076] A second powder dropping module, comprising a second powder dropping seat 510, a second powder dropping shaft 520 and a second powder bin 530, wherein the second powder dropping seat 510 is connected to the bracket 210, the second powder bin 530 is connected to the second powder dropping seat 510, and the second powder dropping shaft 520 is rotatably connected to the second powder dropping seat 510;

[0077] It is also worth noting here that the number of the second powder dropping modules is not specifically limited and can be adjusted according to the amount of material required to be laid in that direction, and the corresponding second powder dropping module can be opened and closed each time.

[0078] The second powder suction module includes a second powder suction seat 610 and a second fan 620. The second powder suction seat 610 is connected to the bracket 210. The second powder suction seat 610 is connected to the second fan 620. The second fan 620 can drive the second powder suction seat 610 to suction powder.

[0079] Specifically, the first powder dropping module and the second powder dropping module are located between the first powder suction seat 410 and the second powder suction seat 610 .

[0080] In this embodiment, at least two sets of powder dropping modules and two sets of powder suction modules are used to respectively realize the laying of two materials and the removal of excess material. At the same time, the two sets of powder suction modules can realize the synchronous completion of material laying and removal of excess raw materials in the same direction, effectively improving the powder laying efficiency of multiple materials.

[0081] like Figure 1-Figure 5 As shown, on the basis of the above embodiment, the first powder dropping module also includes a first reducer 340 and a first motor 350, the first reducer 340 and the first motor 350 are fixed relative to the first powder dropping seat 310, the first powder dropping shaft 320 is connected to the first motor 350 through the first reducer 340, and the first motor 350 can drive the first powder dropping shaft 320 to rotate through the first reducer 340, and the second powder dropping module also includes a second reducer 540 and a second motor 550, the second reducer 540 and the second motor 550 are fixed relative to the second powder dropping seat 510, the second powder dropping shaft 520 is connected to the second motor 550 through the second reducer 540, and the second motor 550 can drive the second powder dropping shaft 520 to rotate through the second reducer 540.

[0082] In this embodiment, the first motor 350 can drive the first powder dropping shaft 320 to rotate through the first reducer 340, thereby driving the first material to move from the first powder bin 330 toward the forming platform 100 to achieve powder dropping, and the second motor 550 can drive the second powder dropping shaft 520 to rotate through the second reducer 540, thereby driving the second material to move from the second powder bin 530 toward the forming platform 100 to achieve powder dropping.

[0083] like Figure 1-Figure 5As shown, on the basis of the above embodiment, the first powder suction module also includes a first collector 440 and a first powder collecting bottle 450, the first collector 440 is located between the first powder suction seat 410 and the first filter 430, the first powder suction seat 410 is connected to the first filter 430 through the first collector 440, and the first powder collecting bottle 450 is connected to the first collector 440, the second powder suction module also includes a second collector 640 and a second powder collecting bottle 650, the second collector 640 is located between the second powder suction seat 610 and the second filter 630, the second powder suction seat 610 is connected to the second filter 630 through the second collector 640, and the second powder collecting bottle 650 is connected to the second collector 640.

[0084] More specifically, the first collector 440 and the second collector 640 are both cyclone collectors.

[0085] In this embodiment, the fan starts working to generate negative pressure at the powder suction seat. The powder near the powder suction seat is sucked in under the action of the negative pressure and enters the collector along the pipeline. Relying on the structural characteristics of the collector, the powder rotates downward along the cylinder wall and falls into the powder collecting bottle. The gas enters the fan along the outlet of the collector.

[0086] like Figure 1-Figure 5 As shown, on the basis of the above embodiment, the first powder suction module also includes a first filter 430, the first filter 430 is located between the first powder suction seat 410 and the first fan 420, and the first powder suction seat 410 is connected to the first fan 420 through the first filter 430, and the second powder suction module also includes a second filter 630, the second filter 630 is located between the second powder suction seat 610 and the second fan 620, and the second powder suction seat 610 is connected to the second fan 620 through the second filter 630.

[0087] In this embodiment, the first powder suction seat 410 is connected to the first fan 420 through the first filter 430 to filter the air, thereby preventing impurities from contaminating the first fan 420. The second powder suction seat 610 is connected to the second fan 620 through the second filter 630 to filter the air, thereby preventing impurities from contaminating the second fan 620.

[0088] like Figure 1-Figure 5As shown, on the basis of the above embodiment, the first powder suction module also includes a first anemometer 460, which is connected to the first fan 420 and is used to detect the wind speed of the first fan 420, and the second powder suction module also includes a second anemometer 660, which is connected to the second fan 620 and is used to detect the wind speed of the second fan 620.

[0089] In this embodiment, the first anemometer 460 can detect the wind speed of the first fan 420 and can monitor the wind speed changes of the first fan 420 in real time to adjust the output frequency of the first fan 420. The second anemometer 660 can detect the wind speed of the second fan 620 and can monitor the wind speed changes of the second fan 620 in real time to adjust the output frequency of the second fan 620.

[0090] like Figure 1-Figure 5 As shown, on the basis of the above embodiment, the first powder suction seat 410 is provided with a first scraping knife seat 411, and the first scraping knife seat 411 is arranged on the side of the first powder suction seat 410 close to the bracket 210, and the second powder suction seat 610 is provided with a second scraping knife seat 611, and the second scraping knife seat 611 is arranged on the side of the second powder suction seat 610 close to the bracket 210.

[0091] In this embodiment, a first scraper seat 411 is provided on the side of the first powder suction seat 410 close to the bracket 210, and the first powder is pre-leveled before the first powder suction seat 410 sucks the powder as the bracket 210 moves. A second scraper seat 611 is provided on the side of the second powder suction seat 610 close to the bracket 210, and the second powder is pre-leveled before the second powder suction seat 610 sucks the powder as the bracket 210 moves, thereby effectively improving the powder suction accuracy.

Claims

1. A non-contact bidirectional powder spreading method for additive manufacturing, characterized in that: Includes steps: S1: the forming platform reduces the pre-laying thickness based on the original thickness, and the first powder dropping module and the first powder suction module move in the first direction at the same time; S2: The first powder dropping module and the first powder suction module are turned on at the same time. The first powder dropping module drops the first material on the original powder layer. The first powder suction module simultaneously recovers the powder whose thickness exceeds the sum of the original thickness and the pre-laid layer thickness, so that a flat first material powder layer is formed on the forming platform, and the laying of the first material is completed; S3: The laser performs a selective scanning on the first material powder layer; S4: the second powder dropping module and the second powder suction module move simultaneously in a second direction opposite to the first direction; S5: The second powder dropping module and the second powder suction module are turned on at the same time. The second powder dropping module drops the second material on the original powder layer. The second powder suction module simultaneously recovers the powder whose thickness exceeds the first material powder layer, so that a flat second material powder layer is formed on the forming platform, and the laying of the second material is completed. S6: The laser performs a selective scanning on the second material powder layer; S7: Repeat S1 to S6 until the processing is completed.

2. A non-contact bidirectional powder spreading method for additive manufacturing according to claim 1, characterized in that: In step S2, the second powder suction module is turned on at the same time, and the first powder dropping module removes excess raw materials through the second powder suction module before dropping the first material on the original powder layer; in step S5, the first powder suction module is turned on at the same time, and the second powder dropping module removes excess first material through the first powder suction module before dropping the second material on the original powder layer.

3. A non-contact bidirectional powder spreading method for additive manufacturing according to claim 1, characterized in that: In step S2, the first material dropped by the first powder dropping module is pre-leveled by a first scraping blade seat between the first powder dropping module and the first powder suction module; In step S5, the second material dropped by the second powder dropping module is pre-leveled by a second scraper seat between the second powder dropping module and the second powder suction module.

4. A non-contact bidirectional powder spreading device for additive manufacturing, characterized in that: include: Forming platform; A linear moving module connected to the forming platform, wherein the linear moving module is provided with a bracket, and the linear moving module can drive the bracket to move relative to the forming platform; A first powder dropping module, comprising a first powder dropping seat, a first powder dropping shaft and a first powder bin, wherein the first powder dropping seat is connected to the bracket, the first powder bin is connected to the first powder dropping seat, and the first powder dropping shaft is rotatably connected to the first powder dropping seat; A first powder suction module comprises a first powder suction seat and a first fan, wherein the first powder suction seat is connected to the bracket, the first powder suction seat is connected to the first fan, and the first fan can drive the first powder suction seat to suck powder; A second powder dropping module, comprising a second powder dropping seat, a second powder dropping shaft and a second powder bin, wherein the second powder dropping seat is connected to the bracket, the second powder bin is connected to the second powder dropping seat, and the second powder dropping shaft is rotatably connected to the second powder dropping seat; The second powder suction module comprises a second powder suction seat and a second fan, wherein the second powder suction seat is connected to the bracket, the second powder suction seat is connected to the second fan, and the second fan can drive the second powder suction seat to suck powder.

5. A non-contact bidirectional powder spreading device for additive manufacturing according to claim 4, characterized in that: The first powder dropping module also includes a first reducer and a first motor, the first reducer and the first motor are fixed relative to the first powder dropping seat, the first powder dropping shaft is connected to the first motor through the first reducer, and the first motor can drive the first powder dropping shaft to rotate through the first reducer, and the second powder dropping module also includes a second reducer and a second motor, the second reducer and the second motor are fixed relative to the second powder dropping seat, the second powder dropping shaft is connected to the second motor through the second reducer, and the second motor can drive the second powder dropping shaft to rotate through the second reducer.

6. A non-contact bidirectional powder spreading device for additive manufacturing according to claim 5, characterized in that: The first powder suction module also includes a first filter, which is located between the first powder suction seat and the first fan, and the first powder suction seat is connected to the first fan through the first filter. The second powder suction module also includes a second filter, which is located between the second powder suction seat and the second fan, and the second powder suction seat is connected to the second fan through the second filter.

7. A non-contact bidirectional powder spreading device for additive manufacturing according to claim 6, characterized in that: The first powder suction module also includes a first collector and a first powder collecting bottle, the first collector is located between the first powder suction seat and the first filter, the first powder suction seat is connected to the first filter through the first collector, and the first powder collecting bottle is connected to the first collector, the second powder suction module also includes a second collector and a second powder collecting bottle, the second collector is located between the second powder suction seat and the second filter, the second powder suction seat is connected to the second filter through the second collector, and the second powder collecting bottle is connected to the second collector.

8. A non-contact bidirectional powder spreading device for additive manufacturing according to claim 5, characterized in that: The first powder suction module also includes a first anemometer, which is connected to the first fan and used to detect the wind speed of the first fan. The second powder suction module also includes a second anemometer, which is connected to the second fan and used to detect the wind speed of the second fan.

9. A non-contact bidirectional powder spreading device for additive manufacturing according to claim 4, characterized in that: The first powder suction seat is provided with a first scraping knife seat, and the first scraping knife seat is arranged on the side of the first powder suction seat close to the bracket. The second powder suction seat is provided with a second scraping knife seat, and the second scraping knife seat is arranged on the side of the second powder suction seat close to the bracket.

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