Selective laser melting forming two-way reciprocating powder spreading device and control method thereof

Abstract

The present application discloses a selective laser melting forming bidirectional reciprocating powder spreading device and a control method thereof. The bidirectional powder spreading device comprises a powder supply assembly, a powder spreading assembly, a dust-free linear transmission component, a left tool setting instrument, a right tool setting instrument and a base; the powder spreading assembly comprises a left scraper, a right scraper, a left rangefinder, a right rangefinder, a left scraper height adjustment component, a right scraper height adjustment component and a powder storage area; the powder supply assembly is used to provide powder to the powder storage area of ​​the powder spreading assembly; the dust-free linear transmission component is located on the side of the base; the powder spreading assembly can move left and right along the dust-free linear transmission component; a substrate is provided on the base. The control method is applicable to the bidirectional powder spreading device. The present application can adjust the height of the scrapers on both sides in real time to spread the powder, and can ensure the consistency of the effect of the powder spreading twice.

Description

Technical Field

[0001] The present application relates to the field of additive manufacturing technology, and in particular to a selective laser melting forming two-way reciprocating powder spreading device and a control method thereof. Background Art

[0002] With the continuous development of 3D printing technology, metal parts 3D printing technology, as the most cutting-edge and most promising technology in the entire 3D printing system, has begun to receive more and more attention. In view of the problems of high mold cost, low material utilization rate, and long production cycle in the traditional processing technology for forming parts with complex shapes, selective laser melting technology (SLM, Selective Laser Melting) has become the main development direction of rapid prototyping in the future. Compared with traditional processing technology, this technology has many advantages, mainly reflected in the ability to directly form metal parts without complex steps such as mold opening, greatly shortening the production cycle of products and accelerating the speed of product launch.

[0003] Common laser selective melting SLM equipment is divided into two types according to the powder spreading method: one-way powder spreading and two-way powder spreading. Among them, the one-way powder spreading equipment adopts a double-cylinder form, and the powder spreading scraper needs to span two cylinders and only work in a single stroke. Before each powder spreading, the scraper first needs to move to the initial position, and then perform powder spreading.

[0004] For the common two-way powder spreading device, there is a powder storage area in the middle of the double scraper mode device. During the powder spreading process, the left scraper is responsible for spreading powder to the right, while the right scraper is responsible for spreading powder to the left. In addition, a powder supply cabin is arranged on one side of the SLM equipment forming chamber to replenish the powder in the powder storage area. Unlike the one-way powder spreading device, this powder supply device adopts a falling powder supply.

[0005] The single-blade mode is a powder spreading mechanism with low efficiency, long time consumption and the powder spreading effect is limited by the single powder supply. For the double-blade mode, there is a technical problem that it is difficult to adjust the scrapers on both sides to the same level, which will cause differences in the effect of two consecutive powder spreadings and affect the forming of parts. In addition, because the double-blade device has a powder storage area located between the scrapers on both sides during the printing process, powder cleaning is often performed only after multiple powder spreading operations. Therefore, most of the powder spread on the printing platform contains a certain amount of large-particle powder after laser sintering, so the spread powder is contaminated powder, which not only affects the forming of parts, but also causes scraper scratches.

[0006] The disclosure of the above background technology content is only used to assist in understanding the inventive concept and technical solution of the present application. It does not necessarily belong to the prior art of the present application. In the absence of clear evidence that the above content has been disclosed on the filing date of the present application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0007] The present application proposes a selective laser melting forming two-way reciprocating powder spreading device and a control method thereof, which can adjust the height of scrapers on both sides in real time to spread powder, and can ensure the consistency of the effects of the two powder spreadings.

[0008] In a first aspect, the present application provides a selective laser melting forming bidirectional reciprocating powder spreading device, comprising a powder supply assembly, a powder spreading assembly, a dust-free linear transmission component, a left tool setting instrument, a right tool setting instrument and a base;

[0009] The powder spreading assembly comprises a left scraper, a right scraper, a left distance meter, a right distance meter, a left scraper height adjustment component, a right scraper height adjustment component and a powder storage area;

[0010] The powder supply assembly is used to supply powder to the powder storage area of ​​the powder spreading assembly;

[0011] The dust-free linear transmission component is located on the side of the base;

[0012] The powder spreading assembly can move left and right along the dust-free linear conveying component;

[0013] A substrate is provided on the base;

[0014] The left scraper and the right scraper are respectively located on the left and right sides of the powder spreading assembly; the left scraper is used to spread the powder in the powder storage area to the right on the substrate; the right scraper is used to spread the powder in the powder storage area to the left on the substrate;

[0015] The left tool setting instrument and the right tool setting instrument are arranged on the left and right sides of the base, and are used for confirming the positions of the left scraper and the right scraper respectively;

[0016] The left rangefinder and the right rangefinder are respectively located on the left and right sides of the powder spreading assembly, and are both used to measure the height of the powder on the substrate;

[0017] The left scraper height adjustment assembly and the right scraper height adjustment assembly are used to adjust the upper and lower heights of the left scraper and the right scraper respectively.

[0018] In some preferred embodiments, a powder overflow port, a push plate and a pushing component are provided at the bottom of the powder storage area. The powder overflow port is used for allowing the powder in the powder storage area to flow out, and the pushing component can push the push plate to open or close the powder overflow port.

[0019] In some preferred embodiments, the left scraper height adjustment assembly and the right scraper height adjustment assembly both include a scraper support frame, a lifting transmission assembly and a power source, the power source can drive the lifting transmission assembly, the lifting transmission assembly can drive the scraper support frame to move up and down, and the scraper support frame is connected to the scraper.

[0020] In some preferred embodiments, the lifting transmission assembly includes a synchronous pulley transmission mechanism, a screw rod and a ball nut; one end of the synchronous pulley transmission mechanism is connected to the power source, and the other end is connected to the screw rod to rotate the screw rod, and the ball nut is sleeved in the screw rod, and the ball nut can drive the scraper support frame to move up and down.

[0021] In some preferred embodiments, the power source is a motor, and the synchronous pulley transmission mechanism includes a first synchronous wheel, a second synchronous wheel and a synchronous belt, the first synchronous wheel is connected to the output shaft of the power source, the second synchronous wheel is connected to the screw rod through a coupling, and the synchronous belt connects the first synchronous wheel with the second synchronous wheel.

[0022] In some preferred embodiments, the scraper support frame is provided on both the left and right sides of the powder spreading assembly; the scraper support frame on the left side and the scraper support frame on the right side correspond to the two lifting transmission components and the two power sources; the left scraper corresponds to the two left rangefinders; and the right scraper corresponds to the two right rangefinders.

[0023] In some preferred embodiments, the pushing component is a cylinder.

[0024] In some preferred embodiments, the left rangefinder and the right rangefinder are both reflective photoelectric rangefinders.

[0025] In some preferred embodiments, the dust-free linear transmission assembly is a dust-free linear synchronous belt transmission assembly.

[0026] In some preferred embodiments, the powder storage area can contain powder for reciprocating bidirectional powder spreading more than 100 times.

[0027] In a second aspect, the present application provides a control method for a selective laser melting forming bidirectional reciprocating powder spreading device, wherein the bidirectional powder spreading device comprises a powder supply assembly, a powder spreading assembly, a dust-free linear transmission assembly, a left tool setting instrument, a right tool setting instrument and a base; the powder spreading assembly comprises a left scraper, a right scraper, a left rangefinder, a right rangefinder, a left scraper height adjustment assembly, a right scraper height adjustment assembly and a powder storage area; a substrate is provided on the base;

[0028] The control method comprises:

[0029] Providing powder to the powder storage area of ​​the powder spreading assembly through the powder supply assembly;

[0030] Confirming the positions of the left scraper and the right scraper by using the left tool setting instrument and the right tool setting instrument to adjust the upper and lower heights of the left scraper and the right scraper;

[0031] Move the powder spreading assembly to the left along the dust-free linear conveying assembly, measure the height of the powder on the substrate by the left rangefinder, and adjust the upper and lower heights of the right scraper by the right scraper height adjustment assembly to spread the powder; move the powder spreading assembly to the right along the dust-free linear conveying assembly, measure the height of the powder on the substrate by the right rangefinder, and adjust the upper and lower heights of the right scraper by the left scraper height adjustment assembly to spread the powder.

[0032] In some preferred embodiments, it also includes: after the number of powder spreading times reaches a specified number, the powder spreading is stopped, and the upper and lower heights of the left scraper are adjusted by the left scraper height adjustment component and / or the upper and lower heights of the right scraper are adjusted by the right scraper height adjustment component to clean the contaminated powder on the substrate.

[0033] In some preferred embodiments, the method further includes measuring the height position of the powder in the powder storage area by a proximity sensor, and if the height position of the powder is lower than a set height position, supplying powder to the powder storage area by the powder supply assembly.

[0034] In some preferred embodiments, the confirming the positions of the left scraper and the right scraper by the left tool setting instrument and the right tool setting instrument specifically includes: detecting the wear amount of the left scraper and the right scraper by the left tool setting instrument and the right tool setting instrument to obtain the adjustment amount of the upper and lower heights of the left scraper and the right scraper.

[0035] In a third aspect, the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores program instructions, and when the program instructions are executed by a processor of a computer, the processor executes the above method.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The left scraper and the right scraper are used for spreading or cleaning powder. The settings of the left and right tool setting instruments allow the positions of the left and right scrapers to be adjusted. The height of the powder on the substrate is measured by the left distance meter and the right distance meter, and then the upper and lower heights of the left and right scrapers are adjusted by the left scraper height adjustment assembly and the right scraper height adjustment assembly respectively. The distance between the left and right scrapers and the base can be accurately adjusted, so that the left and right scrapers can be placed at the appropriate height position for spreading or cleaning powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of a two-way reciprocating powder spreading device for selective laser melting forming according to an embodiment of the present application;

[0039] Figure 2 This is a front view of the powder spreading assembly according to an embodiment of the present application;

[0040] Figure 3 A rear view of the powder spreading assembly according to an embodiment of the present application;

[0041] Figure 4 It is a left side view of the powder spreading assembly according to an embodiment of the present application;

[0042] Figure 5 Schematic diagram of the control method of the embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present application clearer, the following Figures 1 to 5 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" or "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing or for circuit connection.

[0045] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0047] refer to Figure 1 The selective laser melting forming bidirectional reciprocating powder spreading device of this embodiment includes a powder supply assembly 1, a powder spreading assembly 2, a dust-free linear transmission assembly 3, a position sensor 4, a base 5, a Z-axis motor assembly 6 and a control system 7.

[0048] In this embodiment, the dust-free linear transmission component 3 is a dust-free linear synchronous belt transmission component. The dust-free linear transmission component 3 is located on the side of the base 5; Figure 1 The two dust-free linear transmission components 3 are respectively located at the front and rear sides of the base 5 .

[0049] The powder spreading assembly 2 can move left and right along the dust-free linear transmission assembly 3. In this embodiment, the dust-free linear transmission assembly 3 drives the powder spreading assembly 2 to move left and right.

[0050] refer to Figure 2 The powder spreading assembly 2 includes a left scraper 21, a right scraper 22 and a powder storage area 23. The left scraper 21 and the right scraper 22 are respectively located on the left and right sides of the powder spreading assembly 2. The powder storage area 23 is used to accommodate metal powder; the powder storage area 23 is surrounded by a powder storage frame 23A and a powder storage bottom plate 23B. A proximity sensor 231 is provided at the bottom of the powder storage area 23; the proximity sensor 231 is used to measure the height position of the powder in the powder storage area 23.

[0051] refer to Figure 4 The powder spreading assembly 2 further includes a first end fixing plate 28A and a second end fixing plate 28B, which are used to fix the entire powder spreading assembly 2. The first end fixing plate 28A and the second end fixing plate 28B are also fixedly connected to the connecting vertical plate 29 to reinforce the structure. In this embodiment, the connecting vertical plate 29 serves as a reinforcing rib.

[0052] The powder supply assembly 1 is used to supply powder to the powder storage area 23 of the powder spreading assembly 2. The powder in this embodiment is metal powder. In other embodiments, the powder may also be non-metal powder. Figure 1 The powder supply assembly 1 includes a powder hopper 11.

[0053] refer to Figure 1 A substrate 51 is provided on the base 5.

[0054] The left scraper is used to spread the powder in the powder storage area 23 to the right on the substrate 51. The right scraper 22 is used to spread the powder in the powder storage area 23 to the left on the substrate 23.

[0055] The position sensor 4 is arranged on the base 5 and is used to detect the position of the powder spreading device 2 .

[0056] The working principle of the selective laser melting forming two-way reciprocating powder spreading device of this embodiment is described. Put the metal powder into the powder hopper 11 of the powder supply assembly 1, refer to Figure 1 When the powder spreading device 2 is located at the right end of the base 5, the position sensor 4 sends a signal to the control system 7; the proximity sensor 231 detects that the height position of the powder in the powder storage area 23 is lower than the set height position, and also sends a signal to the control system 7. The control system 7 starts the powder supply assembly 1 to deliver the powder to the powder storage area 23 of the powder spreading assembly 2, specifically, the motor is started to drive the rotating shaft in the powder supply assembly 1 to deliver the powder to the powder storage area 23 of the powder spreading assembly 2; when the powder storage area 23 of the powder spreading assembly 2 is full of powder, the proximity sensor 231 feeds back a signal to the control system 7 to stop the motor, thereby causing the powder supply assembly 1 to stop supplying powder to the powder spreading assembly 2; when the powder storage area 23 is full of powder, the powder spreading assembly 2 can spread powder back and forth more than 100 times. At this time, the dust-free linear transmission component 3 will drive the powder-spreading assembly 2 to move to the left, and the metal powder located in the powder storage area 23 of the powder-spreading assembly 2 will be flattened on the entire substrate 51 on the base 5 by the left scraper 21 located on the powder-spreading assembly 2; when the powder-spreading assembly 2 moves to the left end limit position, the position sensor 4 located on the base 5 will feed back the signal to the control system 7, and the molding substrate located on the base 5 will be dragged down to a certain height by the Z-axis motor assembly 6; the dust-free linear transmission component 3 will drive the powder-spreading assembly 2 to move to the right, and the metal powder located in the powder storage area 23 of the powder-spreading assembly 2 will be flattened on the entire molding substrate 51 on the base 5 by the right scraper 22 located on the powder-spreading assembly 2, and the powder-spreading assembly 2 moves back and forth to realize two-way powder spreading.

[0057] refer to Figure 1 The selective laser melting forming bidirectional reciprocating powder spreading device of this embodiment further includes a left tool setting instrument 8 and a right tool setting instrument 9. Figure 2 and Figure 3 The powder spreading assembly 2 also includes a left distance meter 24, a right distance meter 25, a left scraper height adjustment component 26 and a right scraper height adjustment component 27.

[0058] refer to Figure 1 The left tool setting instrument 8 and the right tool setting instrument 9 are arranged on the left and right sides of the base 5, and are used for confirming the positions of the left scraper 21 and the right scraper 22, respectively. In this embodiment, the left tool setting instrument 8 and the right tool setting instrument 9 can respectively establish the coordinate system of the left scraper 21 and the right scraper 22, so as to adjust the height of the left scraper 21 and the right scraper 22 later; on the other hand, the left tool setting instrument 8 and the right tool setting instrument 9 can detect the wear amount of the left scraper 21 and the right scraper 22, so as to obtain the adjustment amount of the upper and lower heights of the left scraper 21 and the right scraper 22, so that the left scraper 21 and the right scraper 22 can accurately carry out the powder spreading or cleaning action.

[0059] refer to Figure 2The left rangefinder 24 and the right rangefinder 25 are respectively located on the left and right sides of the powder spreading assembly 2, and are both used to measure the height of the powder on the substrate 51. In this embodiment, the left rangefinder 24 and the right rangefinder 25 are both reflective photoelectric rangefinders.

[0060] The left scraper height adjustment assembly 26 and the right scraper height adjustment assembly 27 are used to adjust the upper and lower heights of the left scraper 21 and the right scraper 22 respectively.

[0061] According to the above, the left scraper 21 and the right scraper 22 are used for spreading powder or cleaning powder. The setting of the left tool setting instrument 8 and the right tool setting instrument 9 allows the positions of the left scraper 21 and the right scraper 22 to be adjusted. The height of the powder on the substrate 51 is measured by the left rangefinder 24 and the right rangefinder 25, and then the upper and lower heights of the left scraper 21 and the right scraper 22 are adjusted by the left scraper height adjustment component 26 and the right scraper height adjustment component 27 respectively, so that the distance between the left scraper 21 and the right scraper 22 and the base 5 can be accurately adjusted, so that the left scraper 21 and the right scraper 22 can be located at a suitable height position for spreading powder or cleaning powder.

[0062] The selective laser melting forming two-way reciprocating powder spreading device of this embodiment has a simple structure, is easy to find problems, and is convenient for maintenance and replacement.

[0063] refer to Figure 5 This embodiment also provides a control method for a two-way reciprocating powder spreading device for selective laser melting. The control method is applicable to the two-way reciprocating powder spreading device for selective laser melting of this embodiment. The control method includes steps S1 to S3.

[0064] Step S1 : supplying powder to the powder storage area 23 of the powder spreading assembly 2 through the powder supply assembly 1 .

[0065] The specific implementation of this step can refer to the above content.

[0066] Step S2 : confirming the positions of the left scraper 21 and the right scraper 22 by using the left tool setting instrument 8 and the right tool setting instrument 9 to adjust the upper and lower heights of the left scraper 21 and the right scraper 22 .

[0067] refer to Figure 1There are two sets of left tool setting instruments 8 and right tool setting instruments 9 located on the front and rear sides of the base 5 for confirming the positions of the scrapers on the left and right sides. The relative distances between the left scraper 21 and the right scraper 22 and the left rangefinder 24 and the right rangefinder 25 respectively and the wear status of the left scraper 21 and the right scraper 22 are fed back to the control system 7, and the control system 7 obtains the adjustment amount of the upper and lower heights of the left scraper 21 and the right scraper 22, and then the control system 7 controls the left scraper height adjustment component 26 and the right scraper height adjustment component 27 to adjust the upper and lower heights of the left scraper 21 and the right scraper 22, so that the left scraper 21 and the right scraper 22 can spread powder or clean powder.

[0068] Step S3, move the powder spreading assembly 2 to the left along the dust-free straight line conveying assembly 3, measure the height of the powder on the substrate 5 by the left rangefinder 24, and adjust the upper and lower heights of the right scraper 22 by the right scraper height adjustment assembly 27 for powder spreading; move the powder spreading assembly 2 to the right along the dust-free straight line conveying assembly 3, measure the height of the powder on the substrate 5 by the right rangefinder 25, and adjust the upper and lower heights of the right scraper 22 by the left scraper height adjustment assembly 26 for powder spreading.

[0069] The control system 7 controls the dust-free linear transmission component 3 to drive the powder spreading assembly 2 to move to the left. At this time, the left rangefinders 24 located on both sides of the left scraper 21 will sense the height of the sintered powder at the substrate 5 and feed back the signal to the control system 7, and the control system controls the right scraper height adjustment component 27 to adjust the right scraper 22 up and down, so that the right scraper 22 is located at a position suitable for powder spreading, specifically, it can be located at a position slightly higher than the height of the sintered powder at the substrate 5.

[0070] Similarly, the control system 7 controls the dust-free linear transmission component 3 to drive the powder spreading assembly 2 to move to the right. At this time, the right rangefinders 25 located on both sides of the right scraper 22 will sense the height of the sintered powder at the substrate 5 and feed back the signal to the control system 7, and the control system controls the left scraper height adjustment component 26 to adjust the left scraper 21 up and down, so that the left scraper 21 is located at a position suitable for powder spreading, specifically, it can be located at a position slightly higher than the height of the powder after sintering at the substrate 5. In this way, the reciprocating left and right motion of the powder spreading assembly 2 can achieve accurate powder spreading at the same height on both sides based on the powder height at the substrate 5.

[0071] According to the above, this embodiment can adjust the height of the scrapers on both sides in real time for powder spreading, and can make the scrapers on both sides adjustable to the same level during the two-way powder spreading process, thereby ensuring the consistency of the powder spreading effects twice and realizing automatic and precise adjustment of the gap between the scrapers.

[0072] After the number of powder spreading reaches a specified number, specifically 10 times, there will be more contaminated powder on the substrate 5. The control system 7 controls the powder spreading assembly 2 to stop spreading powder, and adjusts the upper and lower heights of the left scraper 21 through the left scraper height adjustment component 26 and / or adjusts the upper and lower heights of the right scraper 22 through the right scraper height adjustment component 27 to clean the contaminated powder on the substrate 5.

[0073] refer to Figure 2 and Figure 3 Specifically, a powder overflow port 232, a push plate 233 and a push component 234 are provided at the bottom of the powder storage area 23; the powder overflow port 232 is used for the powder in the powder storage area 23 to flow out, and the push component 234 can push the push plate 233 to open or close the powder overflow port 232. In this embodiment, the push component 234 is a cylinder. The control system 7 will control the push component 234 to push the push plate 233 to close the powder overflow port 232; at this time, the powder spreading assembly 2 adjusts the scraper to effectively clean the contaminated powder at the base 5; after the powder cleaning is completed, the control system 7 will feed back a signal to the push component 234 to pull back the push plate 233 and open the powder overflow port 232. It can be seen that this embodiment can effectively enable the powder cleaning movement by controlling the opening and closing of the powder overflow port 232 located between the scrapers on both sides, and can avoid the contaminated powder from scratching the scraper.

[0074] The powder contained in the powder spreading assembly 2 at a time can be used for reciprocating bidirectional powder spreading more than 100 times, which greatly improves the printing efficiency.

[0075] When the powder level in the powder storage area 23 of the powder spreading assembly 2 drops to a certain level, the proximity sensor 231 at the lower position feeds back a signal to the control system 7. The control system 7 controls the dust-free linear conveyor assembly 3 to drive the powder spreading assembly 2 to move to the powder supply assembly 1 at the right end for powder supply.

[0076] refer to Figure 4 , the left scraper height adjustment assembly 26 and the right scraper height adjustment assembly 27 both include a scraper support frame 30, a lifting transmission assembly 40 and a power source 50. The power source 50 can drive the lifting transmission assembly 40; the power source 50 can be specifically a motor or a cylinder. The lifting transmission assembly 40 can drive the scraper support frame 30 to move up and down; the lifting transmission assembly 40 can be specifically a screw transmission assembly. The scraper support frame 30 is connected to the scraper, specifically, different scraper support frames 30 are respectively connected to the left scraper 21 and the right scraper 22. In this way, the power source 50 drives the lifting transmission assembly 40, and the lifting transmission assembly 40 drives the scraper support frame 30 to move up and down, so that the upper and lower heights of the left scraper 21 and the right scraper 22 are adjusted.

[0077] refer to Figure 4A specific form of the lifting transmission assembly 40 is: comprising a synchronous pulley transmission mechanism 60, a screw rod 41 and a ball nut 42. One end of the synchronous pulley transmission mechanism 60 is connected to the power source 50, and the other end is connected to the screw rod 41 to rotate the screw rod 41. The ball nut 42 is sleeved in the screw rod 41, and the ball nut 42 can drive the scraper support frame 30 to move up and down. The synchronous pulley transmission mechanism 60 rotates the screw rod 41, and the ball nut 42 sleeved in the screw rod 41 will move up and down along the screw rod, thereby driving the scraper support frame 30 to move up and down.

[0078] In this embodiment, the power source 50 is a motor. Figure 4 A specific form of the synchronous pulley transmission mechanism 60 is: comprising a first synchronous pulley 61, a second synchronous pulley 62 and a synchronous belt 63. The first synchronous pulley 61 is connected to the output shaft of the power source 50. The second synchronous pulley 62 is connected to the screw rod 41 through a coupling 64, wherein the second synchronous pulley 62 and the coupling 64 are connected through a synchronous pulley shaft 620. The synchronous belt 63 connects the first synchronous pulley 61 with the second synchronous pulley 62. When the power source 50 rotates, the first synchronous pulley 61 is driven to rotate, and then the second synchronous pulley 62 is driven to rotate by the synchronous belt 63, and then the screw rod 41 is rotated through the coupling 64.

[0079] refer to Figure 2 and Figure 4 In this embodiment, the scraper support frame 30 on the left side corresponds to two lifting transmission components 40 and two power sources 50; the scraper support frame 30 on the right side also corresponds to two lifting transmission components 40 and two power sources 50; the left scraper 21 corresponds to two left rangefinders 24; the right scraper 22 also corresponds to two right rangefinders 25. The power source 50 is connected to the first synchronous wheel 61. By driving the power source 50, the ball nut 42 under the second synchronous wheel 62 on the other side drives the scraper on the scraper support frame 30 to adjust up and down in the vertical direction. When the powder laying assembly 2 moves to the left, the left rangefinders 24 on both sides of the left scraper 21 will sense the height of the sintered powder at the substrate 51 and feed back the signal to the control system 7. At this time, the power source 50 on the right side drives the ball nut 42 to pull the scraper support frame 30 on the right side to adjust the height of the right scraper 22 up and down. Similarly, when the powder spreading assembly 2 spreads powder to the right, the right rangefinder 25 on the right scraper 22 senses the height of the sintered powder layer at the substrate 51 and feeds back the signal to the control system 7. The control system 7 drives the power source 50 on the left to drive the ball nut 42 on the left to pull the scraper support frame 30 on the left to adjust the height of the left scraper 21 on the left side. In this way, the vertical height of the scraper can be smoothly adjusted.

[0080] The selective laser melting forming bidirectional reciprocating powder spreading device of this embodiment has a simple structure, can reduce the number of auxiliary equipment, and can achieve bidirectional precise powder spreading during the 3D printing process.

[0081] Those skilled in the art can understand that all or part of the processes in the embodiment method can be completed by a computer program to instruct the relevant hardware, and the program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the various method embodiments. The aforementioned storage medium includes: ROM or random access memory RAM, magnetic disk or optical disk and other media that can store program codes.

[0082] The above content is a further detailed description of the present application in combination with specific / preferred implementation methods, and it cannot be determined that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, without departing from the concept of the present application, they can also make several substitutions or modifications to the described implementation methods, and these substitutions or modifications should be deemed to belong to the protection scope of the present application.

Claims

1. A two-way reciprocating powder spreading device for selective laser melting, characterized in that: It includes powder supply assembly, powder spreading assembly, dust-free linear transmission assembly, left tool setting instrument, right tool setting instrument, base and control system; The powder spreading assembly comprises a left scraper, a right scraper, a left distance meter, a right distance meter, a left scraper height adjustment component, a right scraper height adjustment component and a powder storage area; The powder supply assembly is used to supply powder to the powder storage area of ​​the powder spreading assembly; The dust-free linear transmission component is located on the side of the base; The powder spreading assembly can move left and right along the dust-free linear conveying component; A substrate is provided on the base; The left scraper and the right scraper are respectively located on the left and right sides of the powder spreading assembly; the left scraper is used to spread the powder in the powder storage area to the right on the substrate; The right scraper is used to spread the powder in the powder storage area to the left on the substrate; The left tool setting instrument and the right tool setting instrument are arranged on the left and right sides of the base, and are used for confirming the positions of the left scraper and the right scraper respectively, including: detecting the wear amount of the left scraper and the right scraper by the left tool setting instrument and the right tool setting instrument to obtain the adjustment amount of the upper and lower heights of the left scraper and the right scraper; The left rangefinder and the right rangefinder are respectively located on the left and right sides of the powder spreading assembly, and are both used to measure the height of the powder on the substrate; The left scraper height adjustment assembly and the right scraper height adjustment assembly are used to adjust the upper and lower heights of the left scraper and the right scraper respectively; The left tool setting instrument and the right tool setting instrument are used to feed back the relative distances between the left scraper and the right scraper and the left rangefinder and the right rangefinder respectively, as well as the wear status of the left scraper and the right scraper to the control system, and the control system obtains the adjustment amount of the upper and lower heights of the left scraper and the right scraper, and then the control system controls the left scraper height adjustment component and the right scraper height adjustment component to adjust the upper and lower heights of the left scraper and the right scraper, so that the left scraper and the right scraper can spread powder or clean powder.

2. The selective laser melting forming two-way reciprocating powder spreading device according to claim 1 is characterized in that: A powder overflow port, a push plate and a pushing component are provided at the bottom of the powder storage area. The powder overflow port is used for allowing the powder in the powder storage area to flow out, and the pushing component can push the push plate to open or close the powder overflow port.

3. The selective laser melting forming two-way reciprocating powder spreading device according to claim 1 is characterized in that: The left scraper height adjustment assembly and the right scraper height adjustment assembly both include a scraper support frame, a lifting transmission assembly and a power source. The power source can drive the lifting transmission assembly, and the lifting transmission assembly can drive the scraper support frame to move up and down. The scraper support frame is connected to the scraper.

4. The selective laser melting forming two-way reciprocating powder spreading device according to claim 3 is characterized in that: The lifting transmission assembly includes a synchronous pulley transmission mechanism, a screw rod and a ball nut; one end of the synchronous pulley transmission mechanism is connected to the power source, and the other end is connected to the screw rod to rotate the screw rod, and the ball nut is sleeved in the screw rod, and the ball nut can drive the scraper support frame to move up and down.

5. The selective laser melting forming two-way reciprocating powder spreading device according to claim 4 is characterized in that: The power source is a motor, and the synchronous pulley transmission mechanism includes a first synchronous wheel, a second synchronous wheel and a synchronous belt. The first synchronous wheel is connected to the output shaft of the power source, the second synchronous wheel is connected to the screw rod through a coupling, and the synchronous belt connects the first synchronous wheel with the second synchronous wheel.

6. The selective laser melting forming two-way reciprocating powder spreading device according to claim 3 is characterized in that: The scraper support frames are provided on both the left and right sides of the powder spreading assembly; the scraper support frame on the left and the scraper support frame on the right correspond to the two lifting transmission components and the two power sources; the left scraper corresponds to the two left rangefinders; the right scraper corresponds to the two right rangefinders; the left rangefinder and the right rangefinder are both reflective photoelectric rangefinders; the dust-free linear transmission component is a dust-free linear synchronous belt transmission component; the powder contained in the powder storage area can be used for reciprocating bidirectional powder spreading for more than 100 times.

7. A control method for a two-way reciprocating powder spreading device for selective laser melting according to claim 1, characterized in that: include: Providing powder to the powder storage area of ​​the powder spreading assembly through the powder supply assembly; The positions of the left scraper and the right scraper are confirmed by the left tool setting instrument and the right tool setting instrument to adjust the upper and lower heights of the left scraper and the right scraper; the confirming the positions of the left scraper and the right scraper by the left tool setting instrument and the right tool setting instrument specifically includes: detecting the wear amount of the left scraper and the right scraper by the left tool setting instrument and the right tool setting instrument to obtain the adjustment amount of the upper and lower heights of the left scraper and the right scraper; Move the powder spreading assembly to the left along the dust-free linear conveying assembly, measure the height of the powder on the substrate by the left rangefinder, and adjust the upper and lower heights of the right scraper by the right scraper height adjustment assembly to spread the powder; move the powder spreading assembly to the right along the dust-free linear conveying assembly, measure the height of the powder on the substrate by the right rangefinder, and adjust the upper and lower heights of the right scraper by the left scraper height adjustment assembly to spread the powder.

8. The control method according to claim 7, characterized in that Also includes: After the powder spreading times reaches the specified times, the powder spreading is stopped, and the upper and lower heights of the left scraper are adjusted by the left scraper height adjustment component and / or the upper and lower heights of the right scraper are adjusted by the right scraper height adjustment component to clean the contaminated powder on the substrate; the height position of the powder in the powder storage area is measured by a proximity sensor, and if the height position of the powder is lower than the set height position, powder is provided to the powder storage area by the powder supply assembly.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program instructions, and when the program instructions are executed by a processor of a computer, the processor is caused to execute the method according to any one of claims 7 to 8.

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