A positioning tool for diffusion welding of copper-steel bimetallic pressing plate of aviation hydraulic pump

Abstract

The application discloses an aviation hydraulic pump copper-steel bimetallic pressing plate diffusion welding positioning tool, the bimetallic pressing plate includes a circular steel plate (1), the upper side of the steel plate (1) is provided with a circular first copper plate (2), the lower side of the steel plate (1) is provided with a circular second copper plate (3), the positioning tool includes a positioning ring (4), a clamp (5) and a top sleeve (6); the inner side of the positioning ring (4) is matched with the second copper plate (3), the height of the positioning ring (4) is less than the thickness of the second copper plate (3); the clamp (5) is in the shape of a circular tube, the positioning ring (4) and the steel plate (1) are matched with the inner hole of the clamp (5); the top sleeve (6) is axially provided with a stepped hole (7), the small hole of the stepped hole (7) is matched with the first copper plate (2), and the large hole of the stepped hole (7) is matched with the steel plate (1). The application has the advantages that the qualified rate of the bimetallic pressing plate can be improved.

Description

Technical Field

[0001] This invention belongs to the field of diffusion welding positioning fixtures, and particularly relates to a diffusion welding positioning fixture for copper-steel bimetallic pressure plates of aviation hydraulic pumps. Background Technology

[0002] Some parts in aviation hydraulic pumps are made of copper-steel bimetallic pressure plates that are diffusion welded together, such as the rotor. This combines the advantages of both materials, which not only meets the matching requirements of the friction pair materials but also improves the strength of the materials, resulting in better performance of the parts.

[0003] like Figure 6 As shown, this is a type of copper-steel bimetallic pressure plate used to manufacture parts such as sliding shoes. It includes a circular steel plate 1, with circular copper plates on both the top and bottom sides. The diameter of the copper plates is smaller than that of the steel plate 1. During welding, the steel plate 1 and copper plates must remain coaxial. Welding utilizes two pressure plates: an upper pressure column 9 at the top center of the upper pressure plate 8, which is fixed to the lifting pressure head of the press; and a lower pressure column 11 at the bottom center of the lower pressure plate 10, which is fixed to the press table. During welding, a layer of graphite sheet 12 is first placed on the lower pressure plate 10. The steel plate 1 and two copper plates are then combined and placed on the graphite sheet 12, and covered with another layer of graphite sheet 12. The press is then started to provide downward pressure, completing the diffusion welding of the copper plates and steel plate 1. The graphite sheet 12 acts as an insulator, preventing diffusion welding between the copper plates and the pressure plate.

[0004] In actual operation, it was found that the coaxiality between the steel plate and the copper plate was adjusted visually by the workers, resulting in low coaxiality between the two and reducing the product qualification rate. Summary of the Invention

[0005] The purpose of this invention is to provide a diffusion welding positioning fixture for copper-steel bimetallic pressure plates in aviation hydraulic pumps. This invention has the advantage of improving the yield rate of bimetallic pressure plates.

[0006] The technical solution of the present invention: a diffusion welding positioning fixture for copper-steel bimetallic pressure plates of an aviation hydraulic pump, wherein the bimetallic pressure plate includes a circular steel plate, a circular first copper plate is provided on the upper side of the steel plate, and a circular second copper plate is provided on the lower side of the steel plate. The steel plate, the first copper plate and the second copper plate are coaxial. The diameter of the first copper plate and the diameter of the second copper plate are both smaller than the diameter of the steel plate. The positioning fixture includes a positioning ring, a clamp and a top sleeve. The inner side of the positioning ring mates with the second copper plate, and the height of the positioning ring is less than the thickness of the second copper plate. The clamp is in the shape of a round tube, and the positioning ring and steel plate both fit into the inner hole of the clamp; The top sleeve has a stepped hole in the axial direction. The small hole of the stepped hole mates with the first copper plate, and the large hole of the stepped hole mates with the steel plate.

[0007] In the aforementioned copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps, the right-angled edges of the positioning ring, the right-angled edges of the clamp, and the right-angled edges of the top sleeve are all chamfered.

[0008] In the aforementioned copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps, the positioning ring is radially cut to form two semi-circular positioning components.

[0009] In the aforementioned copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps, the positioning ring is made of aluminum alloy.

[0010] In the aforementioned copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps, the clamp material is aluminum alloy.

[0011] In the aforementioned copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps, the top sleeve is made of aluminum alloy.

[0012] In the aforementioned copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps, the method of using the positioning fixture includes the following steps: First, stack the steel plate, the first copper plate, and the second copper plate together to obtain component one; Second, place the positioning ring onto the bottom of component one, with the positioning ring located on the outside of the second copper plate, to obtain component two; Third, fit the clamp onto component two, with the lower end of the clamp located outside the positioning ring and the upper end of the clamp located outside the steel plate. The clamp keeps the second copper plate and the steel plate coaxial, thus obtaining component three. Fourth, fit the top sleeve onto component three, with the upper end of the steel plate in the large hole of the stepped hole and the first copper plate in the small hole of the stepped hole. The top sleeve keeps the steel plate and the first copper plate coaxial, thus obtaining component four. Fifth, place graphite sheets 12 on both the top and bottom sides of component four to obtain component five; Sixth, place component five on the press and apply pressure to the press to cause diffusion welding between the steel plate and the first copper plate, and between the steel plate and the second copper plate, to obtain the finished bimetallic pressure plate.

[0013] Compared with existing technologies, this invention achieves coaxial positioning between the lower end of the steel plate and the bottom copper plate of the steel plate through clamps and positioning rings, and achieves coaxial positioning between the upper end of the steel plate and the top copper plate of the steel plate through stepped holes on the top sleeve. Ultimately, both copper plates remain coaxial with the steel plate, eliminating the need for manual visual alignment. The high coaxiality ensures that there is no relative displacement between the copper plate and the steel plate when pressure is applied for diffusion welding, further guaranteeing coaxiality. The welding surface of the copper plate will be uniformly melted and distributed on the steel plate, allowing for uniform diffusion between the two, resulting in a high pass rate for the final diffusion-welded bimetallic pressure plate. Attached Figure Description

[0014] Figure 1 This is a frontal view of the positioning fixture in use.

[0015] Figure 2 This is a top view of the positioning ring.

[0016] Figure 3 This is a frontal view of the positioning ring.

[0017] Figure 4 This is a front view diagram of the top cover.

[0018] Figure 5 This is a front view diagram of the clamp.

[0019] Figure 6 This is a schematic diagram of diffusion welding of existing copper-steel bimetallic pressure plates.

[0020] The markings in the attached diagram are: 1-steel plate, 2-first copper plate, 3-second copper plate, 4-positioning ring, 5-clamp, 6-top sleeve, 7-step hole, 8-upper pressure plate, 9-upper pressure column, 10-lower pressure plate, 11-lower pressure column, 12-graphite sheet. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present invention.

[0022] Example 1: Diffusion welding positioning fixture for copper-steel bimetallic pressure plates of aviation hydraulic pumps, such as... Figure 1 As shown, the bimetallic pressure plate is used for positioning during diffusion welding. The bimetallic pressure plate includes a circular steel plate 1, which is made of 40CrNiMoA, with a diameter of 150mm and a thickness of 20mm. A circular first copper plate 2 is provided on the upper side of the steel plate 1, and a circular second copper plate 3 is provided on the lower side of the steel plate 1. The steel plate 1, the first copper plate 2, and the second copper plate 3 are coaxial. The first copper plate 2 and the second copper plate 3 are both made of ZQSn10-2-3, with a diameter of 145mm and a thickness of 8mm.

[0023] The positioning fixture includes a positioning ring 4, a clamp 5, and a top sleeve 6, all made of 2A70 type aluminum alloy.

[0024] The inner side of the positioning ring 4 mates with the second copper plate 3, and the height of the positioning ring 4 is less than the thickness of the second copper plate 3.

[0025] The clamp 5 is cylindrical, and both the positioning ring 4 and the steel plate 1 fit into the inner hole of the clamp 5. Preferably, the outer diameter of the positioning ring 4 is equal to the outer diameter of the steel plate 1, so that the inner hole of the clamp 5 is cylindrical, which is convenient for processing.

[0026] The top sleeve 6 is provided with a stepped hole 7 in the axial direction. The large hole of the stepped hole 7 is matched with the steel plate 1, and the small hole of the stepped hole 7 is matched with the first copper plate 2.

[0027] The right-angled edges of the positioning ring 4, the clamp 5, and the top sleeve 6 are all chamfered.

[0028] The positioning ring 4 is radially cut to form two semi-circular positioning elements.

[0029] Instructions for use include the following steps: First, stack steel plate 1, first copper plate 2, and second copper plate 3 together to obtain component one; Second, place the positioning ring 4 onto the bottom of component one, with the positioning ring 4 located on the outside of the second copper plate 3, to obtain component two; Third, put clamp 5 onto component two. The lower end of clamp 5 is located outside the positioning ring 4, and the upper end of clamp 5 is located outside the steel plate 1. The clamp 5 keeps the second copper plate 3 and the steel plate 1 coaxial, thus obtaining component three. Fourth, put the top sleeve 6 onto component three. The upper end of the steel plate 1 is located in the large hole of the step hole 7, and the first copper plate 2 is located in the small hole of the step hole 7. At this time, the upper end of the first copper plate 2 slightly protrudes from the small hole. The top sleeve 6 keeps the steel plate 1 and the first copper plate 2 coaxial, thus obtaining component four. Fifth, place graphite sheets on both the top and bottom sides of component four to obtain component five; Sixth, place component five on the press, apply pressure between the upper and lower pressure plates using the press, and perform diffusion welding between steel plate 1 and the first copper plate 2, and between steel plate 1 and the second copper plate 3. Then, remove the top sleeve 6, clamp 5 and positioning ring 4 in sequence to obtain the finished bimetallic pressure plate.

[0030] In another method, after the steel plate 1 and the first copper plate 2 are coaxially aligned using the top sleeve 6 in step four, the top sleeve 6 can be removed. In this method, the upper end of the first copper plate 2 does not need to protrude through the small hole.

[0031] Example 2: The differences compared to Example 1 are as follows: Steel plate 1 has a diameter of 130mm and a thickness of 17.6mm.

[0032] The first copper plate 2 and the second copper plate 3 are both made of QSn6.5-0.1, both have a diameter of 130mm and a thickness of 5.8mm.

[0033] The positioning ring 4, clamp 5 and top sleeve 6 are all made of 2A12 aluminum alloy.

[0034] In the description of the embodiments, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations.

Claims

1. A diffusion welding positioning fixture for a copper-steel bimetallic pressure plate of an aviation hydraulic pump, wherein the bimetallic pressure plate comprises a circular steel plate (1), a circular first copper plate (2) is provided on the upper side of the steel plate (1), and a circular second copper plate (3) is provided on the lower side of the steel plate (1), the steel plate (1), the first copper plate (2), and the second copper plate (3) are coaxial, and the diameter of the first copper plate (2) and the diameter of the second copper plate (3) are both smaller than the diameter of the steel plate (1), characterized in that: The positioning fixture includes a positioning ring (4), a clamp (5), and a top sleeve (6); The inner side of the positioning ring (4) mates with the second copper plate (3), and the height of the positioning ring (4) is less than the thickness of the second copper plate (3); The clamp (5) is a round tube, and the positioning ring (4) and the steel plate (1) are both fitted with the inner hole of the clamp (5); The top sleeve (6) is provided with a stepped hole (7) in the axial direction. The small hole of the stepped hole (7) is matched with the first copper plate (2), and the large hole of the stepped hole (7) is matched with the steel plate (1). The positioning ring (4) is made of aluminum alloy; The clamp (5) is made of aluminum alloy; The top sleeve (6) is made of aluminum alloy; The method of using the positioning fixture includes the following steps: First, stack the steel plate (1), the first copper plate (2), and the second copper plate (3) together to obtain component one; Second, place the positioning ring (4) on the bottom of component one, with the positioning ring (4) located on the outside of the second copper plate (3), to obtain component two; Third, put the clamp (5) onto component two. The lower end of the clamp (5) is located outside the positioning ring (4), and the upper end of the clamp (5) is located outside the steel plate (1). The clamp (5) keeps the second copper plate (3) and the steel plate (1) coaxial, thus obtaining component three. Fourth, put the top sleeve (6) onto component three. The upper end of the steel plate (1) is located in the large hole of the step hole (7), and the first copper plate (2) is located in the small hole of the step hole (7). The top sleeve (6) keeps the steel plate (1) and the first copper plate (2) coaxial, thus obtaining component four. Fifth, place graphite sheets (12) on both the top and bottom sides of component four to obtain component five; Sixth, place component five on the press and apply pressure using the press to make diffusion welding between the steel plate (1) and the first copper plate (2) and between the steel plate (1) and the second copper plate (3) to obtain the finished bimetallic pressure plate.

2. The copper-steel bimetallic pressure plate diffusion welding positioning fixture for aviation hydraulic pumps according to claim 1, characterized in that: The right-angled edges of the positioning ring (4), the right-angled edges of the clamp (5), and the right-angled edges of the top sleeve (6) are all chamfered.

3. The diffusion welding positioning fixture for copper-steel bimetallic pressure plates of aviation hydraulic pumps according to claim 2, characterized in that: The positioning ring (4) is radially cut to form two semi-circular positioning elements.

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