Cold isostatic pressing device and method for dispersion copper alloy powder

Abstract

The invention discloses a dispersion copper alloy powder cold isostatic pressing device which comprises a rubber wrapping sleeve body, a filling cavity is formed in the rubber wrapping sleeve body, an opening communicated with the filling cavity is formed in the top of the rubber wrapping sleeve body, a folded edge is arranged on the portion, on the outer side of the opening, of the rubber wrapping sleeve body, and an annular groove is formed between the rubber wrapping sleeve body and the folded edge. A fastening ring is installed in the annular groove, a rubber wrapping sleeve cap is installed on the top of the rubber wrapping sleeve cylinder, the outer sides of the folded edges are wrapped with the two sides of the rubber wrapping sleeve cap, and a clamping hoop is further installed on the outer side of the rubber wrapping sleeve cap. In the cold isostatic pressing forming process, internal powder forming can be effectively achieved, it is guaranteed that a powder filling cavity in a rubber bag sleeve body is uniform in stress, good in formability and free of edge corner chipping, meanwhile, a pressurizing medium can be effectively prevented from entering the bag sleeve, and the problem that water easily enters the cold isostatic pressing forming bag sleeve is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of cold isostatic pressing of dispersed copper alloy powder, and in particular relates to a device and method for cold isostatic pressing of dispersed copper alloy powder. Background Art

[0002] Dispersed copper alloy is a new generation of high-strength, high-conductivity and high-heat-resistant copper alloy material. It has attracted much attention for its high strength, electrical and thermal conductivity, high-temperature softening resistance and other excellent properties. The dispersed strengthening phase in the dispersed copper alloy is nano-scale Al2O3 particles. Since the Al2O3 particles in the matrix are very small and the density is quite different from that of the copper alloy matrix, this series of alloys can only be produced by powder metallurgy. Cold isostatic pressing is the core and key production process in the powder metallurgy processing of dispersed copper alloys. The molding quality seriously affects the subsequent performance and processing yield. The geometric dimension accuracy and easy water ingress during the molding process have always been common technical problems in the industry, and there is no better solution. Therefore, a cold isostatic pressing device and method for dispersed copper alloy powder are urgently needed to solve the above problems. Summary of the invention

[0003] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a device and method for cold isostatic pressing of dispersed copper alloy powder.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0005] A cold isostatic pressing device for dispersed copper alloy powder comprises a rubber sleeve cylinder body, a filling cavity is arranged in the rubber sleeve cylinder body, an opening communicating with the filling cavity is arranged at the top of the rubber sleeve cylinder body, a folded edge is arranged on the outer side of the opening of the rubber sleeve cylinder body, an annular groove is formed between the rubber sleeve cylinder body and the folded edge, a fastening ring is installed in the annular groove, a rubber sleeve cap is installed on the top of the rubber sleeve cylinder body, two sides of the rubber sleeve cap are covered on the outer side of the folded edge, and a clamp is also installed on the outer side of the rubber sleeve cap.

[0006] It is further defined that the rubber sleeve body and the rubber sleeve cap are made of nitrile rubber or polyurethane, and the Shore hardness value thereof is 55-65HA. Such a structural design improves the use effect.

[0007] It is further defined that the rubber sleeve body and the folded edge are integrally formed. Such a structural design is convenient for molding production and has high connection strength.

[0008] It is further defined that the fastening ring and the clamp are both made of stainless steel. Such a structural design ensures a long service life.

[0009] A static pressing method of a dispersed copper alloy powder cold isostatic pressing device, characterized in that it comprises the following steps:

[0010] S1: First, install the fastening ring into the ring groove formed between the rubber sleeve body and the folded edge, then put the dispersed copper alloy powder into the rubber sleeve body, cover it with a rubber sleeve cap, put a clamp on the outside of the rubber sleeve cap to fix it, and then use a conventional hanging basket to put it into the cold isostatic pressing cylinder, and go through the pressure increase, pressure maintenance and pressure relief processes;

[0011] S2: In the above S1, when the pressure-raising process is performed, the pressure-raising is performed in stages, the pressure in the first stage is 60-80 MPa, and the pressure-holding time is 1-3 min; the pressure in the second stage is 100-120 MPa, and the pressure-holding time is 1-3 min; the pressure-holding pressure value is reached in the third stage;

[0012] S3: After pressure increase and pressure maintenance, the pressure relief process is carried out in stages. The first stage is to release the pressure to 100-120 MPa, and the pressure maintenance time is 1-3 min; the second stage is to release the pressure to 60-80 MPa, and the pressure maintenance time is 1-3 min; the third stage is to directly release the pressure to 0 MPa, thereby achieving cold isostatic pressing of dispersed copper alloy powder.

[0013] It is further defined that in said S2, the holding pressure is 150-260 MPa.

[0014] The beneficial effects of the present invention are as follows: the present invention ensures the effective transmission of pressure in the cold isostatic press through the rubber sleeve body and the rubber sleeve cap, greatly improves the geometric dimensional accuracy of the molded product, the fastening ring and the clamp ensure the sealing during the pressure increase and pressure relief process at the gap, solves the problem of water ingress during the contraction and expansion of the rubber sleeve body, improves the process yield, reduces the turning allowance of subsequent processing, and improves the comprehensive product processing yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings;

[0016] Figure 1 This is a schematic structural diagram of a cold isostatic pressing device for dispersed copper alloy powder according to an embodiment of the present invention;

[0017] The main component symbols are described as follows:

[0018] The rubber sleeve body 1, the filling cavity 2, the opening 3, the folded edge 4, the annular groove 5, the fastening ring 6, the rubber sleeve cap 7, and the clamp 8. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] like Figure 1 As shown, a cold isostatic pressing device for dispersed copper alloy powder of the present invention has a filling cavity 2 provided in a rubber sleeve body 1, an opening 3 communicating with the filling cavity 2 is provided at the top of the rubber sleeve body 1, a folded edge 4 is provided on the outer side of the opening 3 of the rubber sleeve body 1, an annular groove 5 is formed between the rubber sleeve body 1 and the folded edge 4, a fastening ring 6 is installed in the annular groove 5, a rubber sleeve cap 7 is installed on the top of the rubber sleeve body 1, both sides of the rubber sleeve cap 7 are covered on the outer side of the folded edge 4, and a clamp 8 is also installed on the outer side of the rubber sleeve cap 7.

[0021] Preferably, the rubber sleeve body 1 and the rubber sleeve cap 7 are made of nitrile rubber or polyurethane, and the Shore hardness value thereof is 55-65HA. Such a structural design improves the use effect.

[0022] Preferably, the rubber sleeve body 1 and the folded edge 4 are formed as an integral structure. Such a structural design is convenient for molding production and has high connection strength.

[0023] Preferably, the fastening ring 6 and the clamp 8 are both made of stainless steel. Such a structural design allows for a long service life.

[0024] In this embodiment, dispersed copper alloy powder is loaded into the rubber sleeve cylinder 1, the powder is vibrated to ensure that the powder completely fills the inside of the rubber sleeve cylinder 1; the rubber sleeve cap 7 is covered so that the rubber sleeve cap 7 is completely fitted with the rubber sleeve cylinder 1, and the rubber sleeve cap 7 is tightened with a clamp 8 to prevent the rubber sleeve cap 7 from falling off, and the installed rubber sleeve cylinder 1 is loaded into a cold isostatic press, and the dispersed copper alloy powder is formed according to a specific pressure increase, pressure maintenance and pressure relief process, thereby providing quality assurance for subsequent production and processing.

[0025] A static pressing method of a dispersed copper alloy powder cold isostatic pressing device, characterized in that it comprises the following steps:

[0026] S1: First, install the fastening ring 6 into the annular groove 5 formed between the rubber sleeve body 1 and the folded edge 4, then put the dispersed copper alloy powder into the rubber sleeve body 1, and cover it with a rubber sleeve cap 7, put a clamp 8 on the outside of the rubber sleeve cap 7 to fix it, and then use a conventional hanging basket to put it into the cold isostatic pressing cylinder, and go through the pressure increase, pressure maintenance and pressure relief processes;

[0027] S2: In S1, when the pressure-raising process is carried out, the pressure-raising is staged, the pressure in the first stage is 60-80 MPa, and the pressure-holding time is 1-3 min; the pressure in the second stage is 100-120 MPa, and the pressure-holding time is 1-3 min; the pressure-holding pressure value is reached in the third stage;

[0028] S3: After pressure increase and pressure maintenance, the pressure relief process is carried out in stages. The first stage is to release the pressure to 100-120 MPa, and the pressure maintenance time is 1-3 min; the second stage is to release the pressure to 60-80 MPa, and the pressure maintenance time is 1-3 min; the third stage is to directly release the pressure to 0 MPa, thereby achieving cold isostatic pressing of dispersed copper alloy powder.

[0029] Preferably, in S2, the holding pressure is 150 to 260 MPa.

[0030] In this embodiment, the pressure-raising process adopts staged pressure-raising, with the pressure of the first stage being 60MPa and the pressure-holding time being 1min; the pressure of the second stage being 100MPa and the pressure-holding time being 1min; the pressure of the third stage being 160MPa and the pressure-holding time being 1.5min. After the pressure-holding is completed, staged pressure relief begins, with the pressure relief to 120MPa and the pressure-holding time being 1min in the first stage; the pressure relief to 80MPa and the pressure-holding time being 1min in the second stage; and the pressure relief to 0MPa directly in the third stage.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A cold isostatic pressing device for dispersed copper alloy powder, characterized in that: The invention comprises a rubber sleeve body (1), wherein a filling cavity (2) is provided in the rubber sleeve body (1), an opening (3) communicating with the filling cavity (2) is provided at the top of the rubber sleeve body (1), the rubber sleeve body (1) is provided with a folded edge (4) on the outer side of the opening (3), an annular groove (5) is formed between the rubber sleeve body (1) and the folded edge (4), a fastening ring (6) is installed in the annular groove (5), a rubber sleeve cap (7) is installed at the top of the rubber sleeve body (1), the two sides of the rubber sleeve cap (7) are covered on the outer side of the folded edge (4), and a clamp (8) is also installed on the outer side of the rubber sleeve cap (7).

2. The cold isostatic pressing device for dispersed copper alloy powder according to claim 1, characterized in that: The rubber sleeve body (1) and the rubber sleeve cap (7) are made of nitrile rubber or polyurethane, and the Shore hardness value thereof is 55-65 HA.

3. The cold isostatic pressing device for dispersed copper alloy powder according to claim 2, characterized in that: The rubber sleeve body (1) and the folded edge (4) are arranged as an integrally formed structure.

4. The cold isostatic pressing device for dispersed copper alloy powder according to claim 3, characterized in that: The fastening ring (6) and the clamp (8) are both made of stainless steel.

5. A static pressing method based on the cold isostatic pressing device for dispersed copper alloy powder according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1: firstly install the fastening ring (6) into the annular groove (5) formed between the rubber sleeve body (1) and the folded edge (4), then put the dispersed copper alloy powder into the rubber sleeve body (1), cover it with the rubber sleeve cap (7), put a clamp (8) on the outer side of the rubber sleeve cap (7) to fix it, then use a conventional hanging basket to put it into the cold isostatic pressing cylinder, and go through the processes of pressure increasing, pressure maintaining and pressure releasing; S2: In the above S1, when the pressure-raising process is performed, the pressure-raising is performed in stages, the pressure in the first stage is 60-80 MPa, and the pressure-holding time is 1-3 min; the pressure in the second stage is 100-120 MPa, and the pressure-holding time is 1-3 min; the pressure-holding pressure value is reached in the third stage; S3: After pressure increase and pressure maintenance, the pressure relief process is carried out in stages. The first stage is to release the pressure to 100-120 MPa, and the pressure maintenance time is 1-3 min; the second stage is to release the pressure to 60-80 MPa, and the pressure maintenance time is 1-3 min; the third stage is to directly release the pressure to 0 MPa, thereby achieving cold isostatic pressing of dispersed copper alloy powder.

6. The static pressing method of the dispersed copper alloy powder cold isostatic pressing device according to claim 5, characterized in that: In the step S2, the holding pressure is 150 to 260 MPa.

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