A powder bed additive-subtractive hybrid manufacturing chip removal scraper and method of use thereof

Abstract

A kind of powder bed additive-subtractive composite manufacturing chip removal scraper and its using method, including scraper main body, negative pressure system, filtering system are equipped in scraper main body, rely on negative pressure system to generate negative pressure and part of powder are inhaled into scraper main body by powder bed chip, and the powder inhaled is made to fall back on powder bed by filtering system, chip is collected in scraper main body;The powder that falls back on powder bed is laid again on the surface of powder bed by the powder laying system installed on scraper main body;The chip generated in the process of powder bed additive-subtractive composite manufacturing can be removed by the application, avoid the influence of chip on subsequent additive process and part quality, with the advantages such as good integration, control logic is simple, powder bed surface damage degree is low, chip can be removed and collected in real time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of powder bed additive-subtractive composite manufacturing, in particular to a powder bed additive-subtractive composite manufacturing chip removal scraper and a use method thereof. BACKGROUND

[0002] Powder bed additive-subtractive composite manufacturing is a composite manufacturing technology combining powder bed additive manufacturing and CNC machining. It integrates the advantages of high precision, high degree of freedom of powder bed additive manufacturing, and high surface quality and dimensional accuracy of CNC machining, and can realize integrated precision manufacturing of internal complex structure parts, thus having great development prospects.

[0003] The existing powder bed additive-subtractive composite manufacturing equipment, such as the document "Development of Additive-Subtractive Composite Manufacturing System Based on Laser Selective Melting and High-Speed Cutting" (Tang Chengming et al., Hot Working Technology, DOI: 10.14158 / j.cnki.1001-3814.20202826), ignores the processing of chips generated by subtractive machining. The unremoved chips will directly act on the subsequent additive stage. Since the size of the chips (>200 microns) is much larger than the size of the powder particles (about 30-80 microns), the mixing of the chips will affect the overall mechanical properties of the parts, and the scraper rubber strip is easily damaged, affecting the subsequent additive process. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present application is to provide a powder bed additive-subtractive composite manufacturing chip removal scraper and a use method thereof, which can remove the chips generated in the powder bed additive-subtractive composite manufacturing process, avoid the influence of the chips on the subsequent additive process and the quality of the parts, and has the advantages of good integration, simple control logic, low powder bed surface damage, real-time removal and collection of chips, etc.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] A powder bed additive-subtractive composite manufacturing chip removal scraper, comprising a scraper main body 1, a negative pressure system and a filtering system are arranged in the scraper main body 1. The negative pressure system generates negative pressure to suck the powder bed chips and part of the powder into the scraper main body 1, and the filtering system makes the sucked powder fall back to the powder bed, and the chips are collected in the scraper main body 1. The powder falling back to the powder bed is laid on the surface of the powder bed by the powder laying system 4 installed on the scraper main body 1.

[0007] The n-shaped block 1-2 is connected inside the scraper body 1, and divides the n-shaped chamber 1-1 in the scraper body 1 into two outlets, the outlet away from the powder laying system 4 is the suction port 1-1-1, and the outlet close to the powder laying system 4 is the dropping port 1-1-2; in the dropping port 1-1-2, the n-shaped block 1-2 and the spoiler 1-3 in the shape of "V" connected on the scraper body 1, the spoiler 1-3 reduces the negative pressure suction of the dropping port 1-1-2, so that the chips and the powder are all sucked into the suction port 1-1-1.

[0008] The negative pressure system comprises a first negative pressure fan 6 and a second negative pressure fan 11, and the first negative pressure fan 6 and the second negative pressure fan 11 are connected through a first pipeline 7, a second pipeline 10, a first flow guide pipe 8 and a second flow guide pipe 9; the first flow guide pipe 8 and the second flow guide pipe 9 are communicated with the n-shaped chamber 1-1 inside the scraper body 1 through a filter core 19, and a negative pressure is formed in the n-shaped chamber 1-1 during work.

[0009] The first negative pressure fan 6, the second negative pressure fan 11, the first pipeline 7, the second pipeline 10, the first flow guide pipe 8 and the second flow guide pipe 9 are embedded in the scraper body 1 as a whole, and the outside is protected by the open hole baffle 2.

[0010] The filter core 19 is a cuboid filter core, which is inserted between the n-shaped chamber 1-1 and the first flow guide pipe 8 and the second flow guide pipe 9 through one end of the scraper body 1; when the opening is closed, the sealing pressure plate 3 and the sealing rubber gasket 5 are fixed on the scraper body 1.

[0011] The filter system comprises a filter plate 17, the filter plate 17 is provided with holes for powder leakage only, the filter plate 17 is connected to a filter plate base 16, and an ultrasonic generator 18 is fixed on the corners of the filter plate base 16; one end of the filter plate 17 is connected to a small synchronous pulley 15, the small synchronous pulley 15 is connected to a large synchronous pulley 13 through a synchronous belt 14, and the large synchronous pulley 13 is connected to the output shaft of a motor 12.

[0012] The semicircular clamping groove 16-1 at the end of the filter plate base 16 and the round joint 17-1 at both ends of the filter plate 17 are connected in cooperation, and the filter plate base 16 is fixed on the scraper body 1.

[0013] The powder laying system 4 comprises a first rubber strip buckle 4-2 and a second rubber strip buckle 4-3 connected to a scraper buckle 4-1, the first rubber strip buckle 4-2 and the second rubber strip buckle 4-3 clamp the rubber strip 4-4, and the scraper buckle 4-1 is fixed on the scraper body 1.

[0014] The use method of the chip removing scraper for the powder bed additive and subtractive composite manufacturing comprises the following steps.

[0015] After single subtractive machining, the negative pressure system starts to work, at this time, the filter plate 17 and the filter plate base 16 are in the same plane, the cuttings and part of the powder on the surface of the powder bed 21 are sucked into the suction port 1-1-1 under the action of negative pressure, when passing through the filter plate 17, the powder falls back to the surface of the powder bed 21 and is laid on the surface of the powder bed 21 again by the powder laying system 4, and the cuttings are collected on the filter plate 17;

[0016] When the scraper main body 1 moves as a whole to the material falling bin 20, the filter plate 17 is driven by the motor 12 to be 90 degrees with the filter plate base 16, so that the internal cuttings fall into the material falling bin 20, and the collection of the cuttings is completed;

[0017] In the additive phase without subtractive machining, the negative pressure system does not work, and only the powder laying system 4 plays a role in powder laying.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] (1) Since the scraper of the present application is provided with a negative pressure system and a filtering system, the removal and collection of cuttings in the powder bed additive and subtractive process can be realized, and the influence of the cuttings on the subsequent additive process and the quality of the part is avoided.

[0020] (2) Since the scraper of the present application is provided with a filtering system and a powder laying system 4, the filtering and relaying of the sucked powder are realized synchronously when the cuttings are removed, the surface integrity of the powder bed is ensured, and the subsequent additive process is not affected.

[0021] (3) The negative pressure system and the filtering system of the present application are integrated in the scraper main body 1, and the negative pressure distribution of the n-shaped chamber 1-1 in the scraper main body is adjusted by the n-shaped block 1-2 and the spoiler 1-3, so that the cuttings and the powder can be smoothly sucked into the material falling port 1-1-2 from the material suction port 1-1-1, and the present application has the advantages of high integration, simple control, etc. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the outer shape of the scraper of the embodiment of the present application.

[0023] Figure 2 It is a schematic diagram of the scraper of the embodiment of the present application with the opening baffle 2 and the sealing plate 3 removed.

[0024] Figure 3 It is an A-A sectional view of the scraper main body 1 of the present application.

[0025] Figure 4 It is a B-B sectional view of the scraper main body 1 of the present application.

[0026] Figure 5 It is a negative pressure distribution simulation diagram of the n-shaped chamber 1-1 of the present application.

[0027] Figure 6The schematic diagram of the transmission system of the filter plate 17 of the present application.

[0028] Figure 7 The schematic diagram of the filter plate 17 and the filter plate base 16 of the present application.

[0029] Figure 8 The schematic diagram of the use method of the present application. DETAILED DESCRIPTION

[0030] The present application will be described in detail below in combination with the drawings and examples.

[0031] Referring to Figure 1 and Figure 2 , a powder bed additive-subtractive composite manufacturing chip removal scraper includes a scraper main body 1, a negative pressure system and a filter system are arranged in the scraper main body 1, the powder bed chips and part of the powder are sucked into the scraper main body 1 by the negative pressure generated by the negative pressure system, and the sucked powder is allowed to fall back onto the powder bed by the filter system, and the chips are collected in the scraper main body 1; the powder falling back onto the powder bed is evenly laid on the surface of the powder bed by the powder laying system 4 installed on the scraper main body 1, so as to achieve the effect of chip removal and powder bed surface reconstruction.

[0032] Referring to Figure 3 , Figure 4 and Figure 5 , an n-shaped block 1-2 is welded inside the scraper main body 1, which divides the n-shaped chamber 1-1 in the scraper main body 1 into two outlets, the outlet away from the powder laying system 4 is the material suction port 1-1-1, and the outlet close to the powder laying system 4 is the material falling port 1-1-2; in the material falling port 1-1-2, the n-shaped block 1-2 and the spoiler 1-3 in the shape of “V” are welded on the scraper main body 1, the spoiler 1-3 reduces the negative pressure suction force of the material falling port 1-1-2, so that the chips and the powder are all sucked from the material suction port 1-1-1, and the simulation results show that the negative pressure suction force of the material suction port 1-1-1 is about 23 times that of the material falling port 1-1-2.

[0033] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the negative pressure system includes a first negative pressure fan 6 and a second negative pressure fan 11, the first negative pressure fan 6 and the second negative pressure fan 11 are connected through a first pipeline 7, a second pipeline 10, a first flow guide pipe 8 and a second flow guide pipe 9; the first negative pressure fan 6, the second negative pressure fan 11, the first pipeline 7, the second pipeline 10, the first flow guide pipe 8 and the second flow guide pipe 9 are integrally embedded in the scraper main body 1, and the outside is protected by the opening baffle 2; the first flow guide pipe 8 and the second flow guide pipe 9 are communicated with the n-shaped chamber 1-1 inside the scraper main body 1 through the filter element 19, and a negative pressure is formed in the n-shaped chamber 1-1 during work.

[0034] The filter core 19 is a cuboid filter core inserted between the n-shaped cavity 1-1 and the first and second flow guide pipes 8 and 9 at one end of the scraper main body 1. The insertion end of the filter core 19 is provided with a sealing plate 3 and a sealing rubber gasket 5 fixed on the scraper main body 1 by bolts to ensure good air tightness when the opening is closed.

[0035] With reference to Figure 6 and Figure 7 , the filter system comprises a filter plate 17 provided with holes (400 meshes) for powder only to fall through, effectively filtering powder particles and chips; the filter plate 17 is connected to a filter plate base 16, and the four corners of the filter plate base 16 are fixed with ultrasonic generators 18 to assist in powder falling; one end of the filter plate 17 is connected to a small synchronous pulley 15, the small synchronous pulley 15 is connected to a large synchronous pulley 13 through a synchronous belt 14, the large synchronous pulley 13 is connected to the output shaft of a motor 12, and the filter plate 17 is driven to rotate by the motor 12 and the synchronous belt transmission.

[0036] With reference to Figure 7 , the semicircular clamping groove 16-1 at the end of the filter plate base 16 and the round joint 17-1 at both ends of the filter plate 17 are connected in cooperation, and the filter plate base 16 is fixed on the scraper main body 1 by screws.

[0037] With reference to Figure 4 , the powder laying system 4 comprises a first rubber strip buckle 4-2 and a second rubber strip buckle 4-3 connected to the scraper buckle 4-1, the first rubber strip buckle 4-2 and the second rubber strip buckle 4-3 clamp the rubber strip 4-4 by bolts, and the scraper buckle 4-1 fixes the entire rubber strip part on the scraper main body 1 by bolts, so that the powder laying can be realized.

[0038] The use method of the powder bed additive and subtractive composite manufacturing chip removal scraper comprises the following steps:

[0039] With reference to Figure 8 After single subtractive machining, the negative pressure system starts to work, at this time the filter plate 17 and the filter plate base 16 are in the same plane, the chips and part of the powder on the surface of the powder bed 21 are sucked into the suction port 1-1-1 under the action of negative pressure, when passing through the filter plate 17, the powder falls back to the surface of the powder bed 21 and is laid again on the surface of the powder bed 21 by the powder laying system 4, and the chips are collected on the filter plate 17;

[0040] When the scraper main body 1 moves as a whole to the material falling bin 20, the filter plate 17 is driven by the motor 12 to form a 90-degree angle with the filter plate base 16, so that the internal chips fall into the material falling bin 20, and the chip collection is completed;

[0041] In the additive stage without subtractive machining, the negative pressure system does not work, and only the powder laying system 4 plays a role in powder laying.

[0042] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any changes or replacements within the technical scope disclosed by the present application, which can be easily thought by those skilled in the art, should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A powder bed additive-subtractive hybrid manufacturing chip removal scraper comprising a scraper body (1), characterized in that: The scraper body (1) is provided with a negative pressure system and a filtering system. The negative pressure system generates negative pressure to suck the powder bed chips and part of the powder into the scraper body (1), and the sucked powder is made to fall back onto the powder bed through the filtering system, and the chips are collected in the scraper body (1); the powder falling back onto the powder bed is spread on the surface of the powder bed by the powder spreading system (4) installed on the scraper body (1); The scraper body (1) is internally connected to an n-type stopper (1-2), dividing the n-type chamber (1-1) in the scraper body (1) into two outlets, the outlet away from the powder spreading system (4) being the suction port (1-1-1), and the outlet close to the powder spreading system (4) being the discharge port (1-1-2); within the discharge port (1-1-2), a V-shaped spoiler (1-3) is connected to the n-type stopper (1-2) and the scraper body (1); the spoiler (1-3) reduces the negative pressure suction of the discharge port (1-1-2), so that both chips and powder are sucked in from the suction port (1-1-1); The negative pressure system comprises a first negative pressure fan (6) and a second negative pressure fan (11), wherein the first negative pressure fan (6) and the second negative pressure fan (11) are connected via a first pipe (7), a second pipe (10) and a first guide pipe (8) and a second guide pipe (9); the first guide pipe (8) and the second guide pipe (9) are in communication with the n-type chamber (1-1) inside the scraper body (1) via a filter element (19), and during operation, negative pressure is formed in the n-type chamber (1-1); The filtering system includes a filter plate (17), the filter plate (17) has a hole for only powder to leak out, the filter plate (17) is connected to the filter plate base (16), and an ultrasonic generator (18) is fixed to the corner of the filter plate base (16); one end of the filter plate (17) is connected to the small synchronous pulley (15), the small synchronous pulley (15) is connected to the large synchronous pulley (13) through the synchronous belt (14), and the large synchronous pulley (13) is connected to the output shaft of the motor (12); The powder spreading system (4) comprises a first rubber strip buckle (4-2) and a second rubber strip buckle (4-3) connected to the scraper buckle (4-1); the first rubber strip buckle (4-2) and the second rubber strip buckle (4-3) clamp the rubber strip (4-4); and the scraper buckle (4-1) is fixed to the scraper body (1).

2. The chip removal doctor blade of claim 1, wherein: The first negative pressure fan (6), the second negative pressure fan (11), the first pipeline (7), the second pipeline (10), the first guide pipe (8) and the second guide pipe (9) are integrally embedded in the scraper body (1), and the outer side is protected by the perforated baffle (2).

3. The chip removal doctor blade of claim 1, wherein: The filter element (19) is a rectangular parallelepiped filter element, which is inserted between the n-type chamber (1-1) and the first flow guide tube (8) and the second flow guide tube (9) through one end of the scraper body (1); when the opening is closed, a sealing pressure plate (3) and a sealing rubber pad (5) are used to fix them together on the scraper body (1).

4. The chip removal doctor blade of claim 1, wherein: The semicircular groove (16-1) at the end of the filter plate base (16) and the circular joints (17-1) at both ends of the filter plate (17) are matched and connected, and the filter plate base (16) is fixed on the scraper body (1).

5. A method of using a powder bed additive-subtractive hybrid manufacturing chip-removal scraper according to any one of claims 1-4, characterized in that, include: After single subtractive machining, the negative pressure system starts to work, at this time the filter plate (17) and the filter plate base (16) are in the same plane, the cuttings and part of the powder on the surface of the powder bed (21) are sucked into the suction port (1-1-1) under the action of negative pressure, when passing through the filter plate (17), the powder falls back to the surface of the powder bed (21) and is laid again on the surface of the powder bed (21) by the powder laying system (4), and the cuttings are collected on the filter plate (17); When the scraper main body (1) moves as a whole to the material falling bin (20), the filter plate (17) is driven by the motor (12) to form a 90-degree angle with the filter plate base (16), so that the internal cuttings fall into the material falling bin (20), and the collection of cuttings is completed; In the additive stage without subtractive machining, the negative pressure system does not work, and only the powder laying system (4) plays a role in powder laying.

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