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A fine-grain preparation method for copper parts of conical shells

A technology of fine crystallization and shell parts, which is applied in the field of metal plastic deformation and heat treatment of pure copper or copper alloy parts for fine crystallization and deformation. High requirements, serious cracking tendency of components, etc., to achieve the effect of easy industrial production, good product quality, and improved material utilization

Active Publication Date: 2016-08-24
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The specific deficiencies and shortcomings of these technologies: First, the hot forging forming and annealing process is adopted, the grain size of the formed part grows rapidly with the increase of temperature, and the surface oxidation is serious, so that the surface quality and structure of the processed part are uniform Second, the multi-pass cold extrusion and homogenization annealing process is adopted, the forming process is complex, the deformation passes are many, and the requirements for equipment precision and personnel quality are high; the third is the high-energy forging technology, due to copper, The strain rate strengthening effect of materials such as iron and molybdenum alloys is very obvious, the cracking tendency of components is serious, and the scrap rate of formed parts is high

Method used

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  • A fine-grain preparation method for copper parts of conical shells
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  • A fine-grain preparation method for copper parts of conical shells

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Effect test

Embodiment 1

[0032] (1) Preparation of raw materials: The size of the large end of the conical shell is φ420mm, the height is 200mm, the depth of the inner cone is 192mm, and the maximum wall thickness is 6mm. According to the structural characteristics of the designed formed part, the rolled T2 copper rod of φ120mm is selected as the raw material , cutting and turning the outer surface to make a billet with a diameter of 118mm and a length of 80mm; the impurity element content of the T2 red copper rod is shown in Table 1, and the microstructure is as follows figure 2 shown.

[0033] Table 1 Content of impurity elements in T2 copper rods

[0034]

[0035] (2) Warm extrusion plastic deformation: put the blank obtained in step (1) into H 2 Heat treatment in atmosphere protection furnace (nitrogen purity 99.9%, humidity less than 0.05%), holding temperature 525±5℃, holding time 1.5h; mold tooling system holding temperature 550±5°C, holding time 2h; The final blank is put into the cavity o...

Embodiment 2

[0042] A kind of preparation method of conical shell copper parts adopts following steps (other steps and parameters are with embodiment 1):

[0043] (1) Preparation of raw materials: select the blank, cut the corresponding copper rod length, and cut the blank into a copper rod, the diameter of the copper rod is φ80mm; the copper material is pure copper, bronze, brass or cupronickel;

[0044] (2) Warm extrusion plastic deformation: put the billet obtained in step (1) into an atmosphere protection furnace for heat treatment, the holding temperature is 400°C, and the holding time is 2h. 4h; then put the heat-preserved and heated billet into the extrusion die cavity of the mold tooling system, and under the action of three-dimensional compressive stress and deformation rate, large plastic deformation forms a conical shell copper part. During the forming process, the surface of the billet and a layer of lubricant coated on the inner surface of the mold cavity; the lubricant is bar...

Embodiment 3

[0050] A kind of preparation method of conical shell copper parts adopts following steps (other steps and parameters are with embodiment 1):

[0051] (1) Preparation of raw materials: select the blank, cut the corresponding length of the copper rod, and cut the blank into a copper rod, the diameter of the copper rod is φ170mm; the copper material is pure copper, bronze, brass or cupronickel;

[0052] (2) Warm extrusion plastic deformation: put the blank obtained in step (1) into an atmosphere protection furnace for heat treatment, the holding temperature is 600°C, and the holding time is 1h. 2h; then put the thermally-heated billet into the extrusion die cavity of the mold tooling system, under the action of three-dimensional compressive stress and deformation rate, large plastic deformation forms a conical shell copper part, and the surface of the billet during the forming process and a layer of lubricant coated on the inner surface of the mold cavity; the lubricant is oil-ba...

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Abstract

The invention relates to a grain refinement preparation method of a conical shell copper part, which comprises the steps of warm extrusion plastic deformation, primary heat treatment, cold extrusion plastic deformation and secondary heat treatment. The warm extrusion plastic deformation process comprises the following steps: carrying out heat treatment on the blank in a protective atmosphere, keeping at 400-600 DEG C for 1-2 hours, and putting the blank into a mold to perform plastic deformation, wherein the first-pass deformation amount is higher than 80%. The primary warm extrusion and primary cold extrusion are adopted to implement the formation of the conical shell copper part; and the prepared product has the advantages of high quality, excellent grain structural homogenity, excellent surface smoothness, excellent dimensional accuracy, excellent mechanical properties and the like.

Description

technical field [0001] The invention belongs to the technical field of metal plastic deformation, in particular to the technical field of deformation heat treatment for fine graining of pure copper or copper alloy parts which is widely used. Background technique [0002] Copper belongs to the face-centered cubic lattice structure, has more slip surfaces, has good electrical conductivity, thermal conductivity, and excellent cold and hot forming performance, and its chemical properties are relatively stable. It is used in aerospace, ships, weapons, electronics and other fields. The application is very extensive. According to the relevant literature, the deformation heat treatment methods for copper or copper alloy components at home and abroad are relatively simple, and the common ones are the combination of hot forging forming, cold extrusion forming and homogenization annealing treatment process, such as Professor Wang Tiefu of Nanjing University of Science and Technology T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/08
CPCC22F1/08
Inventor 陈强舒大禹夏祥生李祖荣赵志翔王艳彬
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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