Scratchless powder spreading device for additive manufacturing

Abstract

The application belongs to the technical field of additive manufacturing equipment, and relates to a scraper-free powder spreading device for additive manufacturing, which comprises a powder supply cabin, a powder control device and a powder supply cabin driving device; the powder supply cabin driving device is connected with the powder supply cabin and drives the powder supply cabin to reciprocate; the powder control device is arranged at the bottom of the powder supply cabin and is in communication with the inside of the powder supply cabin. The scraper-free powder spreading device for additive manufacturing can effectively improve powder spreading efficiency and printing forming quality.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of additive manufacturing equipment, and relates to a non-blade powder spreading device, in particular to a non-blade powder spreading device for additive manufacturing. BACKGROUND

[0002] Additive manufacturing is often realized by layer-by-layer manufacturing, and the layer-by-layer manufacturing requires spreading raw materials-powder in the forming area according to the thickness required by the process. The prior art usually adopts a contact type powder spreading device such as a scraper or a powder spreading roller to spread powder.

[0003] Taking the scraper as an example, the disadvantages are as follows: firstly, the scraper often contacts the formed part during the powder spreading process due to the warping deformation of the formed part, so that the formed part is damaged or even scrapped; secondly, the scraper needs to spread powder on the full surface of each layer during the powder spreading process, even the parts that do not need to be formed also need to be spread, and the powder spread out of the non-sintering area is often contaminated, which leads to low powder spreading efficiency and low powder utilization rate. SUMMARY

[0004] In order to solve the above technical problems in the background art, the present application provides a non-blade powder spreading device for additive manufacturing, which can effectively improve the powder spreading efficiency and the printing forming quality.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] A non-blade powder spreading device for additive manufacturing, characterized in that: the non-blade powder spreading device for additive manufacturing comprises a powder supply cabin, a powder control device and a powder supply cabin driving device; the powder supply cabin driving device is connected with the powder supply cabin and drives the powder supply cabin to reciprocate; the powder control device is arranged at the bottom of the powder supply cabin and communicates with the inside of the powder supply cabin.

[0007] The lower surface of the powder control device is non-contact with the upper surface of the powder bed.

[0008] When the powder control device is a horizontal type, the powder control device comprises a shell left side plate, a shell right side plate, a horizontal magnetic core, a coil, a fixed plate and a spring; the shell left side plate and the shell right side plate are oppositely arranged, and the shell left side plate and the shell right side plate form a powder passage; the fixed plate is arranged between the shell left side plate and the shell right side plate; the fixed plate is non-contact with the shell right side plate; the horizontal magnetic core is arranged on the upper surface of the fixed plate; one end of the spring is connected with the shell left side plate, and the other end is connected with the horizontal magnetic core; the coil is embedded in the horizontal magnetic core; in the power-off state of the coil, the spring tightly presses the horizontal magnetic core on the side wall of the shell right side plate to promote the powder passage to be closed; in the power-on state of the coil, the horizontal magnetic core is contracted on the upper surface of the fixed plate along the axial direction of the horizontal magnetic core to promote the powder passage to be opened.

[0009] The powder controller further comprises a flow guide block; the flow guide block is disposed between the left side plate of the shell and the right side plate of the shell; the horizontal magnetic core is disposed between the flow guide block and the fixed plate and reciprocates along the space between the flow guide block and the fixed plate; the flow guide block is fixed on the left side plate of the shell and is not in contact with the right side plate of the shell; a powder channel is formed between the flow guide block and the right side plate of the shell; at least one of the opposite surfaces of the flow guide block and the right side plate of the shell is a non-planar surface, and preferably, at least one of the opposite surfaces of the flow guide block and the right side plate of the shell is a smooth non-planar surface.

[0010] Grooves are formed on the flow guide block and the fixed plate; the powder controller further comprises a sealing ring filled in the grooves.

[0011] The powder controller further comprises a buffer damping pad plate disposed between the flow guide block and the right side plate of the shell; a powder channel is formed between the flow guide block and the buffer damping pad plate; in the power-off state of the coil, the spring tightly presses the horizontal magnetic core against the sidewall of the buffer damping pad plate to close the powder channel.

[0012] An air inlet channel is provided on the left side plate of the shell; the air inlet channel is in communication with the space between the flow guide block and the fixed plate; as an option, a top cover plate is provided on the top of the powder supply chamber, and an air inlet is provided on the top cover plate and in communication with the inside of the powder supply chamber; as an option, the distance between the lower surface of the powder controller and the upper surface of the powder bed is 0.1mm-5mm.

[0013] When the powder controller is a vertical powder controller, the powder controller is multiple, and the multiple powder controllers are disposed at the bottom of the powder supply chamber along the axial direction of the powder supply chamber and are in communication with the powder supply chamber respectively.

[0014] The powder controller comprises a coil, a spring, a shell, a valve body, a powder falling plate, a vertical valve core and a flow guide plate; the shell is a box structure with an opening at the top and the bottom; the flow guide plate, the valve body and the powder falling plate are sequentially arranged in the shell from top to bottom; the valve body is not in contact with the shell and forms a powder channel with the shell; the flow guide plate is provided with a powder through hole; the vertical valve core is disposed in the valve body along the axial direction of the valve body and can slide in the valve body; the coil is embedded in the valve body and surrounds the movement track of the vertical valve core reciprocating in the valve body; the spring is disposed between the vertical valve core and the valve body and is connected with the vertical valve core and the valve body respectively; the powder falling plate is provided with a powder falling hole; the structure of the powder falling hole is matched with the bottom structure of the vertical valve core; in the power-off state of the coil, the spring tightly presses the vertical valve core in the powder falling hole on the powder falling plate; in the power-on state of the coil, the vertical valve core is away from the powder falling hole on the powder falling plate, at this time, the powder supply chamber is in communication with the powder falling hole through the powder through hole and the powder channel.

[0015] The powder control device further comprises a sealing ring arranged between the vertical valve core and the valve body; the powder through hole is arranged around the valve body outside the projection position of the flow guide plate; the powder falling hole on the powder falling plate is in a conical structure; preferably, a top cover plate is arranged on the top of the powder supply cabin, and an air inlet is arranged on the top cover plate and penetrates the inside of the powder supply cabin; preferably, the distance between the lower surface of the powder control device and the upper surface of the powder bed is 0.1mm-5mm.

[0016] The advantages of the present application are:

[0017] The present application provides a no-blade powder laying device for additive manufacturing, comprising a powder supply cabin, a powder control device and a powder supply cabin driving device; the powder supply cabin driving device is connected with the powder supply cabin and drives the powder supply cabin to reciprocate; the powder control device is arranged at the bottom of the powder supply cabin and penetrates the inside of the powder supply cabin. The present application adopts a no-blade scheme for powder laying to avoid blade sticking, blade sticking powder, and deformation and damage of the formed part, which can effectively improve the forming quality and forming qualification rate of the powder laying type additive manufacturing equipment; at the same time, the present application can avoid full-width powder laying for each layer, and can also realize no powder laying for part of the non-sintering area, thereby reducing the powder consumption, improving the powder laying efficiency, reducing the powder consumption, and reducing the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of the first embodiment of the no-blade powder laying device for additive manufacturing provided by the present application;

[0019] Figure 2 is a structural schematic view of the powder control device adopted in the first embodiment provided by the present application in a closed state;

[0020] Figure 3 is a structural schematic view of the powder control device adopted in the first embodiment provided by the present application in an open state;

[0021] Figure 4 is a powder laying area division schematic view of the first embodiment provided by the present application;

[0022] Figure 5 is a structural schematic view of the second embodiment (including powder laying area division) of the no-blade powder laying device for additive manufacturing provided by the present application;

[0023] Figure 6 is a structural schematic view of the powder control device adopted in the second embodiment provided by the present application in a closed state;

[0024] Figure 7 is a structural schematic view of the powder control device adopted in the second embodiment provided by the present application in an open state;

[0025] Figure 8 is a partial top view of a powder controller used in the second embodiment of the present application;

[0026] In the figure:

[0027] 1 - shaped base plate; 2 - first shaped part; 3 - shaped platform; 4 - shaped cylinder; 5 - powder controller; 501 - left side plate of the housing; 502 - flow guide block; 503 - damping pad; 504 - right side plate of the housing; 505 - horizontal magnetic core; 506 - sealing ring; 507 - coil; 508 - fixed plate; 509 - spring; 510 - housing; 511 - valve body; 512 - powder falling plate; 513 - vertical valve core; 514 - flow guide plate; 6 - powder supply cabin; 7 - top cover plate; 8 - air inlet; 9 - second shaped part. DETAILED DESCRIPTION

[0028] Referring to Figure 1 , Figure 4 and Figure 5 , the present application provides a no-blade powder spreading device for additive manufacturing, which comprises a powder supply cabin 6, a powder controller 5 and a powder supply cabin driving device; the powder supply cabin driving device is connected to the powder supply cabin 6 and drives the powder supply cabin 6 to move back and forth, the lower surface of the powder controller 5 is not in contact with the upper surface of the powder bed, preferably, the distance between the lower surface of the powder controller 5 and the upper surface of the powder bed is 0.1mm-5mm; the powder controller 5 is placed at the bottom of the powder supply cabin 6 and is connected to the inside of the powder supply cabin 6. The powder controller 5 is a horizontal powder controller or a vertical powder controller. In addition, a top cover plate 7 is arranged at the top of the powder supply cabin 6, and an air inlet 8 is arranged on the top cover plate 7. The air inlet 8 is connected to an inert gas with a pressure of 0.1Mpa-1.5Mpa during the powder spreading process, and the inert gas includes but is not limited to argon and nitrogen, so as to ensure a certain positive pressure in the powder supply cabin.

[0029] Referring to Figure 2 and Figure 3 , when the powder controller 5 is a horizontal powder controller, the powder controller 5 is installed at the bottom of the powder supply cabin 6 and is fixed to the powder supply cabin 6 by screws; the top cover plate 7 is provided with a hole at the upper part, and the air inlet 8 is installed in the hole, and at the same time, the top cover plate 7 is installed on the top of the powder supply cabin 6 by screws. As shown in Figure 1As shown, the powder controller 5, the powder supply cabin 6, the top cover plate 7 and the air inlet 8 form an integral whole, which is the powder laying device, and the lower surface thereof is the bottom surface of the powder controller 5, which is 0.2mm-5mm away from the upper surface of the powder bed. The forming cylinder 4 is located at the lower part of the forming base plate 1, and the top part thereof is embedded into the slot of the forming base plate 1, the forming platform 3 is located inside the forming cylinder, the first forming part 2 is located at the upper part of the forming platform, and the integral whole formed by the forming platform 3 and the first forming part 2 can move up and down in the height direction, i.e. Z direction. The integral whole of the powder laying device is located at the upper part of the left side of the forming base plate 1, and under the action of the driving device (including but not limited to electric push rod, air cylinder, lead screw, etc., prior art, which will not be described herein again) and the guiding device (including but not limited to guide rail slider, linear bearing, etc., prior art, which will not be described herein again), can move in the left-right direction, and the moving speed is controllable, such as by controlling the rotating speed of the electric push rod driving motor. During the powder laying process, the powder supply cabin 6 is filled with powder in advance, the air inlet 8 of the top cover plate 7 at the top of the powder laying device is always connected to a path of inert gas, including but not limited to argon or nitrogen, and the pressure thereof is 0.8Mpa-1.2Mpa, so that the powder supply cabin 6 is in a positive pressure state, which can increase the driving force when the powder falls. At this time, the powder controller 5 includes the shell left side plate 501, the shell right side plate 504, the horizontal magnetic core 505, the coil 507, the fixed plate 508 and the spring 509; the shell left side plate 501 and the shell right side plate 504 are oppositely arranged, and the shell left side plate 501 and the shell right side plate 504 form a powder passage; the fixed plate 508 is arranged between the shell left side plate 501 and the shell right side plate 504; the fixed plate 508 is non-contact with the shell right side plate 504; the horizontal magnetic core 505 is arranged on the upper surface of the fixed plate 508; one end of the spring 509 is connected with the shell left side plate 501, and the other end thereof is connected with the horizontal magnetic core 505; the coil 507 is embedded in the horizontal magnetic core 505; under the de-energized state of the coil 507, the spring 509 tightly presses the horizontal magnetic core 505 against the side wall of the shell right side plate 504 to promote the powder passage to be closed; under the energized state of the coil 507, the horizontal magnetic core 505 is contracted on the upper surface of the fixed plate 508 along the axial direction of the horizontal magnetic core 505 to promote the powder passage to be opened.

[0030] Referring to Figure 2 and Figure 3In order to facilitate the powder to slide down the powder controller 5 smoothly, the powder controller 5 of the present application further comprises a flow guide block 502; the flow guide block 502 is arranged between the left side plate 501 of the shell and the right side plate 504 of the shell; the horizontal magnetic core 505 is arranged between the flow guide block 502 and the fixed plate 508 and reciprocates along the space between the flow guide block 502 and the fixed plate 508; the flow guide block 502 is fixed on the left side plate 501 of the shell and is non-contact with the right side plate 504 of the shell; the powder channel is formed between the flow guide block 502 and the right side plate 504 of the shell; the opposite surface of the flow guide block 502 and the right side plate 504 of the shell is at least a non-plane, preferably, the opposite surface of the flow guide block 502 and the right side plate 504 of the shell is at least a smooth non-plane.

[0031] The flow guide block 502 and the fixed plate 508 are both provided with grooves; the powder controller 5 further comprises a sealing ring 506 filled in the grooves, and the sealing ring 506 can prevent the powder from leaking.

[0032] The powder controller 5 further comprises a buffer damping pad 503 arranged between the flow guide block 502 and the right side plate 504 of the shell; the powder channel is formed between the flow guide block 502 and the buffer damping pad 503; in the power-off state of the coil 507, the spring 509 tightly presses the horizontal magnetic core 505 against the sidewall of the buffer damping pad 503 to close the powder channel. The buffer damping pad 503 is made of polyurethane material and has a hardness of Shore A 80.

[0033] The left side plate 501 of the shell is provided with an air inlet channel; the air inlet channel is in communication with the space between the flow guide block 502 and the fixed plate 508, and the cavity where the spring 509 is located can maintain pressure balance during the movement of the horizontal magnetic core 505 through the air inlet channel, so as to prevent the formation of negative pressure and increase the driving force of the horizontal magnetic core 505 or the powder from easily leaking to this place.

[0034] Referring to Figure 2 In the specific work of the powder controller 5 of the present application, the horizontal magnetic core 505 moves to the right under the action of the spring 509 and tightly abuts against the buffer damping pad 503, at this time, the powder channel is closed and the powder cannot fall down; when powder is needed, the coil 507 in the horizontal magnetic core 505 is powered on to generate a magnetic force, the magnetic force overcomes the force of the spring 509 to move to the left, the magnetic core leaves the buffer damping pad by a certain distance, the powder channel is opened, referring to Figure 3, the powder can fall down to the powder bed along the powder channel between the horizontal magnetic core 505 and the buffer pad 503 under the guidance of the gas pressure inside the powder supply cabin and the guide block 502 to realize powder laying. When powder laying is not needed, the coil 507 is powered off, no magnetic force is generated, the spring 509 compresses the horizontal magnetic core 505, the horizontal magnetic core 505 is tightly attached to the buffer pad 503 under the action of the spring 509, the powder channel is closed, and the powder cannot fall down through the powder controller 5. The current flowing through the coil 507 can be controlled to control the magnetic force, thereby controlling the distance between the horizontal magnetic core 505 and the buffer pad 503, i.e., the size of the powder channel, and further controlling the powder flow. The driving force of the horizontal magnetic core 505 can be the electromagnetic force generated by the coil 507, the pressure or suction force generated by the gas, or the pushing force and pulling force generated by the electric push rod, etc.; the spring 509 can be other objects with spring properties, such as flexible rubber blocks, etc. Based on the present application, during the powder laying process, the powder laying amount of different powder laying areas can be controlled by controlling the movement speed of the powder laying device and the size of the powder laying switch opening according to the shape and placement position of the shaped part, so as to realize powder laying only in a certain range of the shaped part area, and no powder laying or corresponding thickness powder laying every 1-100 layers in the remaining area. During the powder laying process, the powder flow, i.e., the powder laying amount, can be changed by controlling the internal gas pressure of the powder supply cabin and the opening and closing size of the horizontal magnetic core 505; further, the layer thickness control can be realized by changing the powder flow and the horizontal movement speed of the powder laying device.

[0035] Referring to Figure 4 , according to the shape and placement position of the first shaped part 2, the shaped area is divided into three areas A, B and C. During the shaping process, the powder laying device moves to the right, no powder is laid in the A area, after moving to the B area, the powder passage is opened through the above control, the powder laying device moves to the right at the same time, the powder falls into the B area to complete the powder laying in this area, after moving to the C area, the powder laying is stopped as in the A area, and the powder laying device waits outside the sintering area of the first shaped part 2 for sintering completion without moving to the outside of the full width of the shaping. After the layer sintering is completed, the powder laying device moves to the left, no powder is laid in the C area, after moving to the B area, the powder passage is opened through the above control, the powder laying device moves to the left at the same time, the powder falls into the B area to complete the powder laying in this area, after moving to the A area, the powder laying is stopped, and the powder laying device waits outside the sintering area of the first shaped part 2 for sintering completion without moving to the outside of the full width of the shaping. The above process is repeated to complete the powder laying work in the whole part shaping process.

[0036] Referring to Figure 6 and Figure 7, the second embodiment of the powder controller 5 adopted by the present application. The difference between this embodiment and the aforementioned powder controller 5 (horizontal powder controller) is that the structure of the powder controller 5 adopted by this embodiment is different, and in this embodiment, the powder controller 5 adopted is a vertical powder controller, and there are several powder falling switches inside the powder controller 5, which can be controlled individually, and further, this embodiment can achieve more accurate powder laying area partitioning. Specifically, when the powder controller 5 is a vertical powder controller, there are multiple powder controllers 5, which are placed at the bottom of the powder supply cabin 6 along the axial direction of the powder supply cabin 6 and are respectively penetrated by the powder supply cabin 6. The powder controller 5 includes a coil 507, a spring 509, a shell 510, a valve body 511, a powder falling plate 512, a vertical valve core 513, and a flow guide plate 514; the shell 510 is a box-shaped structure with openings at the top and bottom; the flow guide plate 514, the valve body 511, and the powder falling plate 512 are arranged in the shell 510 from top to bottom; the valve body 511 and the shell 510 are non-contact and form a powder passage between them; the flow guide plate 514 is provided with powder through holes; the vertical valve core 513 is arranged in the valve body 511 along the axial direction of the valve body 511 and slides in the valve body 511; the coil 507 is embedded in the valve body 511 and is arranged around the movement track of the vertical valve core 513 reciprocating along the valve body 511; the spring 509 is arranged between the vertical valve core 513 and the valve body 511 and is connected to the vertical valve core 513 and the valve body 511 respectively; the powder falling plate 512 is provided with a powder falling hole; the structure of the powder falling hole matches the bottom structure of the vertical valve core 513; in the power-off state of the coil 507, the spring 509 tightly presses the vertical valve core 513 in the powder falling hole on the powder falling plate 512; in the power-on state of the coil 507, the vertical valve core 513 is away from the powder falling hole on the powder falling plate 512, at this time, the powder supply cabin 6 is penetrated by the powder falling hole through the powder through hole and the powder passage.

[0037] The powder controller 5 further includes a sealing ring 506 arranged between the vertical valve core 513 and the valve body 511, which can prevent powder from entering the above-mentioned cavity; see Figure 8 The powder through holes are arranged around the valve body 511 outside the projection position of the flow guide plate 514, and the aperture of the powder through hole is 100 times the diameter of the powder, and these powder through holes are arranged around the lower valve body; after the powder supply cabin 6 is filled with powder and pressurized, the powder will flow directly down to the powder falling plate 512 along the powder through hole opened by the flow guide plate 514, reaching around the valve body 513.

[0038] The structure of the powder falling hole on the powder falling plate 512 is conical. In addition, the deflector 514 has a ventilation hole inside, which is connected to the inside of each valve body 511 at one end and is led out to the shell 510 through a long ventilation hole inside the deflector 514 at the other end. The shell 510 also has a corresponding ventilation hole at the corresponding position. The function of the ventilation hole is to balance the gas pressure in the cavity of the valve body 511 and the external pressure during the movement of the valve core 513, further ensuring the smooth movement of the valve core 513.

[0039] The valve body 511, the coil 507, the spring 509, and the valve core 513 are all several, and each can be controlled individually by turning on and off the power and the current size. Several valve bodies 511, coils 507, springs 509, and valve cores 513 form several small unit powder switches, which can cover the entire area of the powder falling plate 512. The combined effect can realize the uniform thickness of the powder falling from the powder control device 5, and the individual control effect can realize single-point control, that is, during the powder laying process, according to the powder laying requirements, part of the powder switches in the powder control device 5 are opened, and part of the powder switches are closed. The horizontal movement of the superimposed powder laying device can control whether to lay powder in any area, thereby realizing more accurate powder laying area partitioning.

[0040] Referring to Figure 6 When powder laying is not needed, the coil 507 is de-energized, there is no magnetic force, the spring 509 presses the valve core 513, the valve core 513 is tightly attached to the powder falling plate 512 under the action of the spring 509, the conical surface at the lower part of the valve core 513 is attached to the conical surface on the powder falling plate 512, the powder channel is closed, and the powder cannot fall through the powder control device 5; referring to Figure 7 When powder laying is needed, the coil 507 is energized, generating a magnetic force that overcomes the force of the spring 509, driving the valve core 513 to move upward, the valve core 513 moves away from the powder falling plate 512 by a certain distance, the powder channel is opened, and the powder can fall through the powder channel under the action of the inert gas pressure and gravity in the powder supply cabin 6, and the powder laying is performed. The current flowing through the control coil 507 can realize magnetic force control, thereby controlling the distance between the valve core 513 and the powder falling plate 512, that is, controlling the size of the powder channel, and further controlling the powder flow.

[0041] Referring to Figure 5According to the shape and the position of the second shaped part 9, the forming area is divided into three areas A, B and C. During the forming process, the powder laying device moves to the right, and at the same time, the single powder channel is controlled to realize that no powder is laid in the area A, powder is laid in each layer in the area B, and in the area C, powder is laid once every 50 layers, and the powder thickness is 50 times of the powder thickness of each layer in the area B. After moving to the right through the whole forming area, the powder laying device stops at the right side of the forming base plate 1 to wait for the completion of sintering. After the completion of sintering of the current layer, the powder laying device moves to the left, and at the same time, the single powder channel is controlled to realize that no powder is laid in the area A, powder is laid in each layer in the area B, and in the area C, powder is laid once every 50 layers, and the powder thickness is 50 times of the powder thickness of each layer in the area B. After moving to the left through the whole forming area, the powder laying device stops at the left side of the forming base plate 1 to wait for the completion of sintering. The above process is repeated, and the powder laying work in the whole part forming process is completed.

Claims

1. A scraper-free powder spreading device for additive manufacturing, characterized in that: The scraper-free powder spreading device for additive manufacturing comprises a powder supply cabin (6), a powder controller (5), and a powder supply cabin driving device; the powder supply cabin driving device is connected to the powder supply cabin (6) and drives the powder supply cabin (6) to reciprocate; the powder controller (5) is placed at the bottom of the powder supply cabin (6) and is in communication with the interior of the powder supply cabin (6); The lower surface of the powder controller (5) is in non-contact with the upper surface of the powder bed; When the powder controller (5) is a horizontal powder controller, the powder controller (5) comprises a left side plate (501) of a shell, a right side plate (504) of a shell, a horizontal magnetic core (505), a coil (507), a fixed plate (508) and a spring (509); the left side plate (501) of the shell and the right side plate (504) of the shell are arranged relative to each other, and the left side plate (501) and the right side plate (504) of the shell form a powder channel; the fixed plate (508) is placed between the left side plate (501) of the shell and the right side plate (504) of the shell; the fixed plate (508) is non-contact with the right side plate (504) of the shell; the horizontal magnetic core (505) is placed on the upper surface of the fixed plate (508); one end of the spring (509) is connected to the left side plate (501) of the shell, and the other end is connected to the horizontal magnetic core (505); the coil (507) is embedded in the horizontal magnetic core (505); the coil (50 7) In the power-off state, the spring (509) presses the horizontal magnetic core (505) against the side wall of the right side plate (504) of the housing to close the powder channel; when the coil (507) is powered on, the horizontal magnetic core (505) contracts along the axial direction of the horizontal magnetic core (505) on the upper surface of the fixed plate (508) to open the powder channel; the powder controller (5) further includes a guide block (502); the guide block (502) is placed on the left side of the housing The horizontal magnetic core (505) is placed between the guide block (502) and the fixed plate (508) and reciprocates along the space between the guide block (502) and the fixed plate (508); the guide block (502) is fixed on the left side plate (501) of the shell and is non-contact with the right side plate (504) of the shell; a powder channel is formed between the guide block (502) and the right side plate (504) of the shell.

2. The scraper-free powder spreading device for additive manufacturing according to claim 1, characterized in that: The guide block (502) and the fixed plate (508) are both provided with grooves; the powder controller (5) further comprises a sealing ring (506) filled in the grooves.

3. The scraper-free powder spreading device for additive manufacturing according to claim 2, characterized in that: The powder controller (5) further comprises a buffering and shock-absorbing pad (503) arranged between the guide block (502) and the right side plate (504) of the housing; a powder channel is formed between the guide block (502) and the buffering and shock-absorbing pad (503); when the coil (507) is in a power-off state, the spring (509) presses the horizontal magnetic core (505) against the side wall of the buffering and shock-absorbing pad (503) to close the powder channel.

4. The scraper-free powder spreading device for additive manufacturing according to claim 3, characterized in that: An air inlet channel is provided on the left side plate (501) of the shell; the air inlet channel is connected to the space between the guide block (502) and the fixed plate (508); a top cover plate (7) is provided on the top of the powder supply chamber (6), and an air inlet (8) connected to the interior of the powder supply chamber (6) is provided on the top cover plate (7); the lower surface of the powder controller (5) is spaced 0.1 mm to 5 mm from the upper surface of the powder bed.

Images