Scrap removing scraper for additive and subtractive composite manufacturing of powder bed and using method of scrap removing scraper

Abstract

The invention discloses a powder bed additive and subtractive composite manufacturing cuttings removing scraper and a using method thereof.The scraper comprises a scraper body, a negative pressure system and a filtering system are arranged in the scraper body, powder bed cuttings and part of powder are sucked into the scraper body by means of negative pressure generated by the negative pressure system, and the sucked powder falls back to a powder bed through the filtering system; cuttings are collected in the scraper main body; the powder falling back to the powder bed is laid on the surface of the powder bed by a powder laying system mounted on the scraper main body; according to the method, cuttings generated in the powder bed additive and subtractive composite manufacturing process can be removed, the influence of the cuttings on the subsequent additive manufacturing process and the part quality is avoided, and the method has the advantages of being good in integration, simple in control logic, low in powder bed surface damage degree, capable of removing and collecting the cuttings in real time and the like.

Description

Technical Field

[0001] The invention relates to the technical field of powder bed additive and subtractive composite manufacturing, and in particular to a chip removal scraper used for powder bed additive and subtractive composite manufacturing and a use method thereof. Background Art

[0002] Powder bed additive and subtractive composite manufacturing is a composite manufacturing technology that combines powder bed additive manufacturing and CNC machining. It combines the advantages of powder bed additive manufacturing's high precision (compared to other additive manufacturing technologies), high degree of freedom, and CNC machining's high surface quality and dimensional accuracy. It can achieve integrated precision manufacturing of internal complex structural parts and has great development prospects.

[0003] Existing powder bed additive and subtractive composite manufacturing equipment, such as the document "Development of Additive and 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 treatment of chips generated by subtractive processing. The unremoved chips will directly act on the subsequent additive stage. Because the chip size (>200 microns) is much larger than the powder particle size (about 30-80 microns), the mixing of chips will affect the overall mechanical properties of the parts, and easily damage the scraper rubber strip, affecting the subsequent additive process. Summary of the invention

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

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A scraper for removing chips used in powder bed additive and subtractive composite manufacturing comprises a scraper body 1. A negative pressure system and a filtering system are arranged inside the scraper body 1. The negative pressure generated by the negative pressure system sucks 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.

[0007] The scraper body 1 is internally connected with an n-type stopper 1-2, which divides the n-type chamber 1-1 in the scraper body 1 into two outlets. The outlet away from the powder spreading system 4 is the suction port 1-1-1, and the outlet close to the powder spreading system 4 is the discharge port 1-1-2. In 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.

[0008] The negative pressure system includes a first negative pressure fan 6 and a second negative pressure fan 11, which are connected through a first pipe 7, a second pipe 10 and a first guide tube 8, and a second guide tube 9; the first guide tube 8 and the second guide tube 9 are connected to the n-type chamber 1-1 inside the scraper body 1 through a filter element 19, and negative pressure is formed in the n-type chamber 1-1 during operation.

[0009] The first negative pressure fan 6 , the second negative pressure fan 11 , the first pipeline 7 , the second pipeline 10 , the first guide tube 8 and the second guide tube 9 are integrally embedded in the scraper body 1 , and the outer side is protected by the perforated baffle 2 .

[0010] The filter element 19 is a rectangular filter element, which is inserted between the n-type chamber 1-1 and the first guide tube 8 and the second guide tube 9 through one end of the scraper body 1; when closing the opening, it is fixed on the scraper body 1 by a sealing pressure plate 3 and a sealing rubber pad 5.

[0011] The filtering system includes a filter plate 17, which has holes for only powder to leak out, and the filter plate 17 is connected to a filter plate base 16, and an ultrasonic generator 18 is fixed to a corner of the filter plate base 16; one end of the filter plate 17 is connected to a small synchronous pulley 15, and 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 the motor 12.

[0012] The semicircular groove 16 - 1 at the end of the filter plate base 16 and the round 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 .

[0013] The powder spreading system 4 includes 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 on the scraper body 1.

[0014] The method for using the chip removal scraper for powder bed additive and subtractive composite manufacturing comprises:

[0015] After a single subtractive process, 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 in from 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. The chips are collected on the filter plate 17.

[0016] When the scraper body 1 moves as a whole to the drop bin 20, the filter plate 17, driven by the motor 12, is at 90 degrees to the filter plate base 16, so that the internal chips fall into the drop bin 20, completing the chip collection;

[0017] In the additive stage when no subtractive processing is performed, 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 present invention has the following beneficial effects:

[0019] (1) Since the scraper of the present invention is provided with a negative pressure system and a filtering system, the chips can be removed and collected in the powder bed additive and subtractive process, thereby avoiding the influence of the chips on the subsequent additive process and the quality of the parts.

[0020] (2) Since the scraper of the present invention is provided with a filtering system and a powder spreading system 4, when removing the chips, the inhaled powder is filtered and re-laid simultaneously, thereby ensuring the surface integrity of the powder bed and not affecting the subsequent additive process.

[0021] (3) The present invention integrates the negative pressure system and the filtering system inside the scraper body 1, and adjusts the negative pressure distribution of the n-type chamber 1-1 inside the scraper body through the n-type block 1-2 and the spoiler 1-3, so that chips and powder can be smoothly sucked into the discharge port 1-1-2 from the suction port 1-1-1, and has the advantages of high integration and simple control. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the scraper appearance according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of removing the opening baffle 2 and the sealing pressure plate 3 by a scraper according to an embodiment of the present invention.

[0024] Figure 3 It is a cross-sectional view of the scraper body 1 of the present invention taken along the line AA.

[0025] Figure 4 It is a BB cross-sectional view of the scraper body 1 of the present invention.

[0026] Figure 5 This is a simulation diagram of negative pressure distribution in the n-type chamber 1-1 of the present invention.

[0027] Figure 6Schematic diagram of the transmission system of the filter plate 17 of the present invention.

[0028] Figure 7 Schematic diagram of the filter plate 17 and the filter plate base 16 of the present invention.

[0029] Figure 8 It is a schematic diagram of the method of using the present invention. DETAILED DESCRIPTION

[0030] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0031] Reference Figure 1 and Figure 2 A chip removal scraper for powder bed additive and subtractive composite manufacturing comprises a scraper body 1, in which a negative pressure system and a filtering system are arranged. The negative pressure system generates negative pressure to suck powder bed chips and part of 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 evenly spread on the surface of the powder bed by the powder spreading system 4 installed on the scraper body 1, so as to achieve the chip removal and powder bed surface reconstruction effects.

[0032] Reference Figure 3 , Figure 4 and Figure 5 An n-type stopper 1-2 is welded inside the scraper body 1, which divides the n-type chamber 1-1 in the scraper body 1 into two outlets. The outlet far away from the powder spreading system 4 is the suction port 1-1-1, and the outlet close to the powder spreading system 4 is the blanking port 1-1-2; in the blanking port 1-1-2, a "V"-shaped spoiler 1-3 is welded on the n-type stopper 1-2 and the scraper body 1, and the spoiler 1-3 reduces the negative pressure suction of the blanking port 1-1-2, so that both chips and powder are sucked in from the suction port 1-1-1. The simulation results show that the negative pressure suction of the suction port 1-1-1 is about 23 times that of the blanking port 1-1-2.

[0033] Reference 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, which are connected through a first pipeline 7, a second pipeline 10, a first guide tube 8 and a second guide tube 9; the first negative pressure fan 6, the second negative pressure fan 11, the first pipeline 7, the second pipeline 10, the first guide tube 8 and the second guide tube 9 are integrally embedded in the scraper body 1, and the outside is protected by an open baffle 2; the first guide tube 8 and the second guide tube 9 are connected to the n-type chamber 1-1 inside the scraper body 1 through a filter element 19, and a negative pressure is formed in the n-type chamber 1-1 during operation.

[0034] The filter element 19 is a rectangular filter element, which is inserted between the n-type chamber 1-1 and the first guide tube 8 and the second guide tube 9 through one end of the scraper body 1; in order to ensure good air tightness, the insertion end of the filter element 19 is fixed to the scraper body 1 by bolts using a sealing pressure plate 3 and a sealing pad 5 when the opening is closed.

[0035] Reference Figure 6 and Figure 7 The filtering system includes a filter plate 17, which has holes (400 meshes) for only powder to leak out, effectively filtering powder particles and chips; the filter plate 17 is connected to the filter plate base 16, and ultrasonic generators 18 are fixed at the four corners of the filter plate base 16 to assist powder falling; one end of the filter plate 17 is connected to the small synchronous pulley 15, and 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, and the filter plate 17 is driven to rotate through the motor 12 and the synchronous belt transmission.

[0036] Reference Figure 7 The semicircular groove 16 - 1 at the end of the filter plate base 16 and the round joints 17 - 1 at both ends of the filter plate 17 are matched and connected, and the filter plate base 16 is fixed to the scraper body 1 by screws.

[0037] Reference Figure 4 The powder spreading system 4 includes 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 through bolts, and the scraper buckle 4-1 fixes the entire rubber strip part to the scraper body 1 through bolts, so as to realize powder laying.

[0038] The method for using the chip removal scraper for powder bed additive and subtractive composite manufacturing comprises:

[0039] Reference Figure 8 After a single subtractive process, 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 in from 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. The chips are collected on the filter plate 17.

[0040] When the scraper body 1 moves as a whole to the drop bin 20, the filter plate 17, driven by the motor 12, is at 90 degrees to the filter plate base 16, so that the internal chips fall into the drop bin 20, completing the chip collection;

[0041] In the additive stage when no subtractive processing is performed, the negative pressure system does not work, and only the powder laying system 4 plays a role in powder laying.

[0042] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A chip removal scraper for powder bed additive and subtractive composite manufacturing, comprising a scraper body (1), characterized in that: A negative pressure system and a filtering system are provided in the scraper body (1). The negative pressure system generates negative pressure to suck 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, while 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).

2. The chip removal scraper according to claim 1, characterized in that: The scraper body (1) is internally connected with 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); inside 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), and 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).

3. The chip removal scraper according to claim 2, characterized in that: The negative pressure system comprises 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 via a first pipeline (7), a second pipeline (10) and 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 in communication with an n-type chamber (1-1) inside the scraper body (1) via a filter element (19); and when working, negative pressure is formed in the n-type chamber (1-1).

4. The chip removal scraper according to claim 3, characterized in that: 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 body (1), and the outer side is protected by the perforated baffle plate (2).

5. The chip removal scraper according to claim 3, characterized in that: 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 on the scraper body (1).

6. The chip removal scraper according to claim 2, characterized in that: The filtering system comprises a filter plate (17), the filter plate (17) is provided with holes for only powder to leak out, the filter plate (17) is connected to a filter plate base (16), an ultrasonic generator (18) is fixed to a corner 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 an output shaft of a motor (12).

7. The chip removal scraper according to claim 6, characterized in that: 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).

8. The chip removal scraper according to claim 2, characterized in that: 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).

9. A method for using a chip removal scraper for powder bed additive and subtractive composite manufacturing according to any one of claims 1 to 8, characterized in that: include: After a single subtractive process, the negative pressure system starts to work, at which time the filter plate (17) and the filter plate base (16) are in the same plane, and the chips and part of the powder on the surface of the powder bed (21) are sucked in from the suction port (1-1-1) under the action of the 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 chips are collected on the filter plate (17); When the scraper body (1) moves as a whole to the material drop bin (20), the filter plate (17), driven by the motor (12), forms a 90-degree angle with the filter plate base (16), so that the internal chips fall into the material drop bin (20), completing the chip collection; In the additive stage when no subtractive processing is performed, the negative pressure system does not work, and only the powder laying system (4) plays the role of powder laying.

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