A non-contact bidirectional powder spreading method and apparatus for additive manufacturing

Abstract

The application provides a non-contact bidirectional powder laying method and device for additive manufacturing, and belongs to the technical field of additive manufacturing, and 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 application has the beneficial effect that after the forming platform is lowered by a pre-laying layer thickness, the first powder laying module and the first powder suction module simultaneously move in a first direction and are simultaneously opened to lay a first material and suction a first material to form a flat first material powder layer, and after laser scanning, the second powder laying module and the second powder suction module simultaneously move in a second direction and are simultaneously opened to lay a second material and suction a second material to form a flat second material powder layer, so that the rapid laying of two materials is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of additive manufacturing, and relates to a non-contact bidirectional powder laying method and device for additive manufacturing. BACKGROUND

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

[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 only single material can be prepared, and can deposit multiple heterogeneous materials at any position of the component, having higher design freedom in composition and performance, and being an ideal forming technology for rapid production of multi-material and high-performance parts.

[0004] The biggest challenge of the current multi-material laser powder bed fusion process is how to realize the powder laying of multiple heterogeneous materials. The conventional powder laying method does not support the laying of two or more powder materials in one forming cabin.

[0005] The existing multi-material powder laying process involves two steps of heterogeneous powder removal and re-powdering. The powder laying time is long, the material transition zone is difficult to control, and the more types of powder laid, the more times the steps of heterogeneous powder removal and re-powdering increase, which has a large room for improvement. SUMMARY

[0006] The application aims to solve the above problems in the prior art and provides a non-contact bidirectional powder laying method and device for additive manufacturing.

[0007] The application can be achieved by the following technical scheme: a non-contact bidirectional powder laying method for additive manufacturing, comprising the steps of:

[0008] S1: the forming platform is lowered by a pre-powdering layer thickness based on the original thickness, and the first powder falling module and the first powder suction module move towards the first direction at the same time;

[0009] S2: the first powder falling module and the first powder suction module are opened at the same time, the first powder falling module falls the first material on the original powder layer, and the first powder suction module synchronously recycles the powder whose thickness exceeds the sum of the original thickness and the pre-powdering layer thickness, so that the forming platform forms a flat first material powder layer, and the laying of the first material is completed;

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

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

[0012] S5: the second powder falling module and the second powder suction module are opened simultaneously, the second powder falling module performs powder falling of the second material on the original powder layer, the second powder suction module synchronously recycles the powder whose thickness exceeds the thickness of the first material powder layer, so that the forming platform forms a flat second material powder layer, and the laying of the second material is completed;

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

[0014] S7: repeating S1 to S6 until the machining is completed.

[0015] In the above-mentioned non-contact bidirectional powder laying method for additive manufacturing, in step S2, the second powder suction module is opened simultaneously, and the first powder falling module performs powder falling of the first material on the original powder layer, and the second powder suction module is used to remove the excess raw material first; in step S5, the first powder suction module is opened simultaneously, and the second powder falling module performs powder falling of the second material on the original powder layer, and the first powder suction module is used to remove the excess first material first.

[0016] In the above-mentioned non-contact bidirectional powder laying method for additive manufacturing, in step S2, the first powder falling module and the first powder suction module are used to pre-level the first material falling down by the first powder falling module; in step S5, the second powder falling module and the second powder suction module are used to pre-level the second material falling down by the second powder falling module.

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

[0018] a forming platform;

[0019] a linear movement module connected with the forming platform, the linear movement module being provided with a support, and the linear movement module being capable of driving the support to move relative to the forming platform;

[0020] a first powder falling module comprising a first powder falling seat, a first powder falling shaft and a first powder bin, the first powder falling seat being connected with the support, the first powder bin being connected with the first powder falling seat, and the first powder falling shaft being rotatably connected with the first powder falling seat;

[0021] a first powder suction module comprising a first powder suction seat and a first air blower, the first powder suction seat being connected with the support, the first powder suction seat being connected with the first air blower, and the first air blower being capable of driving the first powder suction seat to suck powder;

[0022] The second powder falling module comprises a second powder falling seat, a second powder falling shaft and a second powder bin, the second powder falling seat is connected with the support, the second powder bin is connected with the second powder falling seat, and the second powder falling shaft is rotatably connected with the second powder falling seat;

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

[0024] In the non-contact bidirectional powder laying device for additive manufacturing, the first powder falling module further comprises a first reducer and a first motor, the first reducer and the first motor are fixed relative to the first powder falling seat, the first powder falling shaft is connected with the first motor through the first reducer, the first motor can drive the first powder falling shaft to rotate through the first reducer, the second powder falling module further comprises a second reducer and a second motor, the second reducer and the second motor are fixed relative to the second powder falling seat, the second powder falling shaft is connected with the second motor through the second reducer, and the second motor can drive the second powder falling shaft to rotate through the second reducer.

[0025] In the non-contact bidirectional powder laying device for additive manufacturing, the first powder suction module further comprises a first filter, the first filter is located between the first powder suction seat and the first fan, the first powder suction seat is connected with the first fan through the first filter, the second powder suction module further comprises 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 with the second fan through the second filter.

[0026] In the non-contact bidirectional powder laying device for additive manufacturing, the first powder suction module further comprises 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 with the first filter through the first collector, the first powder collecting bottle is connected with the first collector, the second powder suction module further comprises 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 with the second filter through the second collector, and the second powder collecting bottle is connected with the second collector.

[0027] In the non-contact bidirectional powder laying device for additive manufacturing, the first powder suction module further comprises a first anemometer connected with the first air blower and used for detecting the air speed of the first air blower, and the second powder suction module further comprises a second anemometer connected with the second air blower and used for detecting the air speed of the second air blower.

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

[0029] Compared with the prior art, the non-contact bidirectional powder laying device for additive manufacturing has the following beneficial effects:

[0030] 1. After the forming platform descends and the pre-laid layer is thickened, the first powder falling module and the first powder suction module move simultaneously in the first direction and simultaneously open to form a flat first material powder layer by falling the first material and suctioning the first material, and after laser scanning, the second powder falling module and the second powder suction module move simultaneously in the second direction and simultaneously open to form a flat second material powder layer by falling the second material and suctioning the second material, so as to realize rapid powder falling of two materials.

[0031] 2. Before the first powder falling module falls the first material on the original powder layer, the second powder suction module removes the excess raw material in advance, which can remove the unnecessary raw material in advance, prevent the raw material from interfering with the first material, and make the laying of the first material not reach the expected effect; before the second powder falling module falls the second material on the original powder layer, the first powder suction module removes the excess first material in advance, which can remove the unnecessary first material in advance, prevent the first material from interfering with the second material, and make the laying of the second material not reach the expected effect.

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

[0033] 4. The air blower starts to work to generate negative pressure at the powder suction seat, the powder close to the powder suction seat is sucked into the pipeline and enters the collector under the action of the negative pressure, and the powder rotates along the cylinder wall and falls into the powder collecting bottle under the action of the structure characteristics of the collector, and the gas enters the air blower 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 changes of the first fan in real time, thereby adjusting the output frequency of the first fan. The second anemometer can detect the wind speed of the second fan and monitor the wind speed changes of the second fan in real time, thereby adjusting the output frequency of the second fan.

[0035] 6. A leveling blade seat is provided on the side of the powder suction port near the bracket. As the bracket moves, the powder is pre-leveled before being suctioned by the powder suction seat, 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. Attached Figure Description

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

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

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

[0040] Figure 4 This is a schematic diagram of the structure of the first powder-discharging module and the second powder-discharging module of the present invention.

[0041] Figure 5 This is a schematic diagram of the structure of the first powder-absorbing module and the second powder-absorbing module of the present invention.

[0042] In the diagram, 100 is the forming platform; 200 is the linear movement module; 210 is the support; 310 is the first powder dropping seat; 320 is the first powder dropping shaft; 330 is the first powder hopper; 340 is the first reducer; 350 is the first motor; 410 is the first powder suction seat; 411 is the first leveling blade seat; 420 is the first fan; 430 is the first filter; 440 is the first collector; 450 is the first powder collection bottle; 460 is the first anemometer; 510 is the second powder dropping seat; 520 is the second powder dropping shaft; 530 is the second powder hopper; 540 is the second reducer; 550 is the second motor; 610 is the second powder suction seat; 611 is the second leveling blade seat; 620 is the second fan; 630 is the second filter; 640 is the second collector; 650 is the second powder collection bottle; and 660 is the second anemometer. Detailed Implementation

[0043] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0044] It should be noted that all directional indications, such as upper, lower, left, right, front, rear, etc., are only used to explain the relative position relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0045] In addition, the descriptions such as "first", "second", "one", etc. in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0046] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through intermediate medium; can be internal communication of two elements or interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0047] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0048] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without deviating from the spirit of the present application or exceeding the scope defined by the appended claims.

[0049] As Figures 1-5 shown, a non-contact bidirectional powder laying method for additive manufacturing includes the steps of:

[0050] S1: the forming platform 100 is lowered by a pre-laying thickness H0 based on the original thickness H10, and the first powder falling module and the first powder suction module move simultaneously in the first direction;

[0051] S2: simultaneously open the first powder falling module and the first powder suction module, the first powder falling module falls the first material on the original powder layer, and the first powder suction module synchronously recycles the powder whose thickness exceeds the sum of the original thickness and the pre-paved 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: laser selective scanning of the first material powder layer;

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

[0054] S5: simultaneously open the second powder falling module and the second powder suction module, the second powder falling module falls the second material on the original powder layer, and the second powder suction module synchronously recycles 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: laser selective scanning of the second material powder layer;

[0056] S7: repeat S1 to S6 until the machining 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 falling modules is not specifically limited, and can be adjusted according to the number of materials to be laid in the direction, and the corresponding first powder falling module can be opened and closed each time.

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

[0060] In the present embodiment, after the forming platform 100 is lowered by the pre-paved layer thickness, the first powder falling module and the first powder suction module simultaneously move in the first direction and are simultaneously opened to fall the first material and suction the first material to form a flat first material powder layer, and after laser scanning, the second powder falling module and the second powder suction module simultaneously move in the second direction and are simultaneously opened to fall the second material and suction the second material to form a flat second material powder layer, thereby realizing rapid powder falling of two materials.

[0061] As Figure 1 , Figure 2As shown in the above embodiment, in step S2, the second powder suction module is opened at the same time, and the first powder falling module removes the excess raw material through the second powder suction module before the first material is fallen on the original powder layer.

[0062] In the embodiment, the first powder falling module removes the excess raw material through the second powder suction module before the first material is fallen on the original powder layer, which can remove the unnecessary raw material in advance, prevent the raw material from interfering with the first material, and make the laying of the first material not reach the expected effect.

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

[0064] As shown in the above embodiment, in step S5, the first powder suction module is opened at the same time, and the second powder falling module removes the excess first material through the first powder suction module before the second material is fallen on the original powder layer. Figure 1 Figure 2 In the embodiment, the second powder falling module removes the excess first material through the first powder suction module before the second material is fallen on the original powder layer, which can remove the unnecessary first material in advance, prevent the first material from interfering with the second material, and make the laying of the second material not reach the expected effect.

[0065] It is worth noting here that the embodiment is for two or more materials, and if the first material and the second material are the same material, this step is not needed.

[0066] As shown in the above embodiment, in step S2, the first material fallen by the first powder falling module is pre-flattened by the first flattening knife seat between the first powder falling module and the first powder suction module, which effectively improves the powder suction accuracy.

[0067] As shown in the above embodiment, in step S5, the second material fallen by the second powder falling module is pre-flattened by the second flattening knife seat between the second powder falling module and the second powder suction module, which effectively improves the powder suction accuracy. Figure 1 Figure 2

[0068] As shown in the above embodiment, in step S2, the first material fallen by the first powder falling module is pre-flattened by the first flattening knife seat between the first powder falling module and the first powder suction module, which effectively improves the powder suction accuracy. Figure 1 Figure 2 As shown in the above embodiment, in step S5, the second material fallen by the second powder falling module is pre-flattened by the second flattening knife seat between the second powder falling module and the second powder suction module, which effectively improves the powder suction accuracy.

[0069] ​​​​It is worth mentioning here that the superposition application of the above several embodiments can realize the role switching of the first powder suction module and the second powder suction module. For example, when the first powder falling module falls powder, the first powder suction module and the first flat scraping seat are used to make the powder flat, and the second powder suction module is used to remove excess material; on the contrary, when the second powder falling module falls powder, the second powder suction module and the second flat scraping seat are used to make the powder flat, and the first powder suction module is used to remove excess material.

[0070] As shown in Figures 1-5 A non-contact bidirectional powder laying device for additive manufacturing, comprising:

[0071] a forming platform 100;

[0072] a linear movement module 200 connected with the forming platform 100, the linear movement module 200 being provided with a support 210, the linear movement module 200 being capable of driving the support 210 to move relative to the forming platform 100;

[0073] a first powder falling module comprising a first powder falling seat 310, a first powder falling shaft 320 and a first powder bin 330, the first powder falling seat 310 being connected with the support 210, the first powder bin 330 being connected with the first powder falling seat 310, and the first powder falling shaft 320 being rotatably connected with the first powder falling seat 310;

[0074] It is also worth mentioning here that the number of the first powder falling module is not specifically limited and can be adjusted according to the amount of material needed to be laid in this direction. The corresponding first powder falling module can be started and stopped each time.

[0075] a first powder suction module comprising a first powder suction seat 410 and a first air blower 420, the first powder suction seat 410 being connected with the support 210, the first powder suction seat 410 being connected with the first air blower 420, and the first air blower 420 being capable of driving the first powder suction seat 410 to suck powder;

[0076] a second powder falling module comprising a second powder falling seat 510, a second powder falling shaft 520 and a second powder bin 530, the second powder falling seat 510 being connected with the support 210, the second powder bin 530 being connected with the second powder falling seat 510, and the second powder falling shaft 520 being rotatably connected with the second powder falling seat 510;

[0077] It is also worth mentioning here that the number of the second powder falling module is not specifically limited and can be adjusted according to the amount of material needed to be laid in this direction. The corresponding second powder falling module can be started and stopped 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 and 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 dispensing module and the second powder dispensing module are located between the first powder suction seat 410 and the second powder suction seat 610.

[0080] In this embodiment, at least two powder-dropping modules and two powder-absorbing modules are used to lay two materials and remove excess materials, respectively. At the same time, the two powder-absorbing modules can simultaneously complete the laying of materials and the removal of excess raw materials in the same direction, effectively improving the powder-laying efficiency of multiple materials.

[0081] like Figures 1-5 As shown, based on the above embodiments, the first powder-discharging module further 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-discharging seat 310. The first powder-discharging shaft 320 is connected to the first motor 350 through the first reducer 340. The first motor 350 can drive the first powder-discharging shaft 320 to rotate through the first reducer 340. The second powder-discharging module further 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-discharging seat 510. The second powder-discharging shaft 520 is connected to the second motor 550 through the second reducer 540. The second motor 550 can drive the second powder-discharging 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 hopper 330 toward the forming platform 100 to achieve powder dropping. 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 hopper 530 toward the forming platform 100 to achieve powder dropping.

[0083] like Figures 1-5As shown, based on the above embodiments, the first powder suction module further includes a first collector 440 and a first powder collection 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 collection bottle 450 is connected to the first collector 440. The second powder suction module further includes a second collector 640 and a second powder collection 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 collection bottle 650 is connected to the second collector 640.

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

[0085] In this embodiment, when the blower starts working, it creates a negative pressure at the powder suction seat. 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 collection bottle. The gas then enters the blower through the outlet of the collector.

[0086] like Figures 1-5 As shown, based on the above embodiments, the first powder suction module further includes a first filter 430, which is located between the first powder suction seat 410 and the first fan 420. The first powder suction seat 410 is connected to the first fan 420 through the first filter 430. The second powder suction module further includes a second filter 630, which is located between the second powder suction seat 610 and the second fan 620. 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 Figures 1-5As shown, on the basis of the above-mentioned embodiment, the first powder suction module further comprises a first anemometer 460 connected with the first air blower 420 and used for detecting the air speed of the first air blower 420, and the second powder suction module further comprises a second anemometer 660 connected with the second air blower 620 and used for detecting the air speed of the second air blower 620.

[0089] In the embodiment, the first anemometer 460 can detect the air speed of the first air blower 420, and the air speed change of the first air blower 420 can be monitored in real time to adjust the output frequency of the first air blower 420, and the second anemometer 660 can detect the air speed of the second air blower 620, and the air speed change of the second air blower 620 can be monitored in real time to adjust the output frequency of the second air blower 620.

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

[0091] In the embodiment, the first powder suction seat 410 is provided with the first scraping knife seat 411 on the side close to the support 210, and the first powder is pre-flattened before being sucked by the first powder suction seat 410, and the second powder suction seat 610 is provided with the second scraping knife seat 611 on the side close to the support 210, and the second powder is pre-flattened before being sucked by the second powder suction seat 610, so that the powder suction precision is effectively improved.

Claims

1. A non-contact bidirectional powder laying method for additive manufacturing, characterized in that, comprising steps of: S1: a forming platform is lowered by a pre-laying thickness on the basis of an original thickness, a first powder falling module and a first powder suction module simultaneously move towards a first direction; S2: the first powder falling module and the first powder suction module are simultaneously opened, the first powder falling module falls a first material on the original powder layer, the first powder suction module synchronously recycles the powder whose thickness exceeds the sum of the original thickness and the pre-laying thickness, so that the forming platform forms a flat first material powder layer, and the laying of the first material is completed; S3: a laser performs selective scanning on the first material powder layer; S4: a second powder falling module and a second powder suction module simultaneously move towards a second direction opposite to the first direction; S5: the second powder falling module and the second powder suction module are simultaneously opened, the second powder falling module falls a second material on the original powder layer, the second powder suction module synchronously recycles the powder whose thickness exceeds the thickness of the first material powder layer, so that the forming platform forms a flat second material powder layer, and the laying of the second material is completed; S6: a laser performs selective scanning on the second material powder layer; S7: steps S1 to S6 are repeated until the processing is completed; In step S2, the second powder suction module is simultaneously opened, and before the first powder falling module falls the first material on the original powder layer, the second powder suction module is used to remove the excess raw material; in step S5, the first powder suction module is simultaneously opened, and before the second powder falling module falls the second material on the original powder layer, the first powder suction module is used to remove the excess first material. 2.The non-contact bidirectional powder laying method for additive manufacturing according to claim 1, characterized in that: in step S2, a first leveling knife seat between the first powder falling module and the first powder suction module is used to pre-level the first material fallen by the first powder falling module; in step S5, a second leveling knife seat between the second powder falling module and the second powder suction module is used to pre-level the second material fallen by the second powder falling module.

3. A non-contact bidirectional powder spreading method for additive manufacturing as claimed in claim 1, characterized in that: The non-contact bidirectional powder laying method for additive manufacturing further comprises a non-contact bidirectional powder laying device; The non-contact bidirectional powder laying device for additive manufacturing comprises: a forming platform; a linear moving module connected with the forming platform, the linear moving module is provided with a support, and the linear moving module can drive the support to move relative to the forming platform; a first powder falling module comprising a first powder falling seat, a first powder falling shaft and a first powder bin, the first powder falling seat is connected with the support, the first powder bin is connected with the first powder falling seat, and the first powder falling shaft is rotatably connected with the first powder falling seat; a first powder suction module comprising a first powder suction seat and a first fan, the first powder suction seat is connected with the support, the first powder suction seat is connected with the first fan, and the first fan can drive the first powder suction seat to suck powder; a second powder falling module comprising a second powder falling seat, a second powder falling shaft and a second powder bin, the second powder falling seat is connected with the support, the second powder bin is connected with the second powder falling seat, and the second powder falling shaft is rotatably connected with the second powder falling seat; A second powder suction module, comprising a second powder suction seat and a second fan, the second powder suction seat is connected with the support, the second powder suction seat is connected with the second fan, and the second fan can drive the second powder suction seat to suck powder; The first powder falling module is located between the first powder suction module and the second powder suction module; and the second powder falling module is located between the first powder suction module and the second powder suction module.

4. The non-contact bidirectional powder spreading method for additive manufacturing according to claim 3, wherein: The first powder falling module further comprises a first speed reducer and a first motor, the first speed reducer and the first motor are fixed relative to the first powder falling seat, the first powder falling shaft is connected with the first motor through the first speed reducer, the first motor can drive the first powder falling shaft to rotate through the first speed reducer, the second powder falling module further comprises a second speed reducer and a second motor, the second speed reducer and the second motor are fixed relative to the second powder falling seat, the second powder falling shaft is connected with the second motor through the second speed reducer, and the second motor can drive the second powder falling shaft to rotate through the second speed reducer.

5. The non-contact bidirectional powder spreading method for additive manufacturing according to claim 4, wherein: The first powder suction module further comprises a first filter, the first filter is located between the first powder suction seat and the first fan, the first powder suction seat is connected with the first fan through the first filter, the second powder suction module further comprises 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 with the second fan through the second filter.

6. The non-contact bidirectional powder spreading method for additive manufacturing according to claim 5, wherein: The first powder suction module further comprises 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 with the first filter through the first collector, the first powder collecting bottle is connected with the first collector, the second powder suction module further comprises 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 with the second filter through the second collector, and the second powder collecting bottle is connected with the second collector.

7. The non-contact bidirectional powder spreading method for additive manufacturing according to claim 4, wherein: The first powder suction module further comprises a first anemometer, the first anemometer is connected with the first fan and used for detecting the wind speed of the first fan, and the second powder suction module further comprises a second anemometer, the second anemometer is connected with the second fan and used for detecting the wind speed of the second fan.

8. The non-contact bidirectional powder spreading method for additive manufacturing according to claim 3, wherein: The first powder suction seat is provided with a first scraping knife seat arranged on one side of the first powder suction seat close to the support, and the second powder suction seat is provided with a second scraping knife seat arranged on one side of the second powder suction seat close to the support.

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