All-fiber shaping method for deep-hole shell copper component

A full fiber and shell technology, applied in the field of full fiber forming of deep hole shell copper parts, can solve the problems of insufficient strength and toughness, and achieve the effects of good dimensional consistency, high surface finish, and improved material utilization.

Inactive Publication Date: 2018-05-15
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

In order to further improve the consistency and service stability of the deep-hole shell copper parts, multi-pass cold extrusion is used to retain the metal fiber streamlines in the components, and overcome the defects of insufficient strength and toughness of formed components such as traditional forming processes such as machining

Method used

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  • All-fiber shaping method for deep-hole shell copper component
  • All-fiber shaping method for deep-hole shell copper component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Cutting: The outer diameter of the upper end of the copper part of the deep hole shell is φ15.5mm, the outer diameter of the middle part is φ16.9mm, the outer diameter of the lower end is φ21.4mm, the inner diameter of the deep hole is φ9.1mm, and the height is 42.5mm. The raw material brass rod is φ16.7mm, calculate the required raw material length, and cut off the blank with a length of 34mm.

[0028] (2) Homogenization heat treatment: put the billet obtained in step (1) into a protective nitrogen (nitrogen purity 99.9%, humidity less than 0.05%) atmosphere for heat treatment, and heat up to a temperature of 560±5°C with the furnace, and the holding time is 2.5h , followed by furnace cooling under a protective atmosphere.

[0029] (3) Preforming: Put the homogenized billet obtained in step (2) into the cavity of the upsetting billet mold, and evenly apply a layer of lubricant on the surface of the billet and the inner surface of the mold cavity to upset the billet...

Embodiment 2

[0036] Embodiment 2 (other steps and parameters are the same as embodiment 1)

[0037] (1) Cutting: the raw material copper rod is φ16mm, calculate the length of the required raw material, and cut off the blank with a length of 36mm.

[0038] (2) Homogenization heat treatment: put the billet obtained in step (1) into a protective nitrogen (nitrogen purity 99.9%, humidity less than 0.05%) atmosphere for heat treatment, heat up to a temperature of 400±5°C with the furnace, and hold for 2 hours. Subsequent furnace cooling is carried out under a protective atmosphere.

[0039] (3) Preforming: Put the homogenized billet obtained in step (2) into the cavity of the upsetting billet mold, and evenly apply a layer of lubricant on the surface of the billet and the inner surface of the mold cavity to upset the billet Cold plastic deformation is prepared to obtain a preform.

[0040] (4) Back-extrusion: Put the deep-hole shell copper preform obtained in step (3) into the back-extrusion ...

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Abstract

The invention discloses an all-fiber shaping method for a deep-hole shell copper component, which includes the steps of: blanking, homogenized annealing, pre-shaping, reverse-extrusion, cold extrudingthinning and drawing, cold heading and stress relief annealing. In the blanking step, required volume of raw material is calculated according to the structure and shape of the copper component and then a copper rod is cut according to corresponding length; in the homogenized annealing, the green body is thermally treated in a protective atmosphere at maintained temperature of 400-600 DEG C and for temperature maintaining time of 2-2.5 h; in the pre-shaping step, the green body is subjected to upsetting blank production and plastic deformation; the reverse-extrusion is a cold-extrusion process, deformation quantity being about 60%. In the method, through the multi-pass cold-extrusion shaping process, metal fibers and radial structure of metal of the deep-hole shell copper component are notdamaged, so that the method can significantly improve the indices of size precision, surface quality, toughness and the like.

Description

technical field [0001] The present invention relates to a metal plastic forming method. Background technique [0002] Copper and its alloys belong to the face-centered cubic structure, have more slip systems, have good electrical conductivity, thermal conductivity, and excellent cold and hot forming properties, and their chemical properties are relatively stable. They are used in aerospace, ships, weapons, electronics, etc. The field of application is very wide. Comparing the relevant literature shows that the traditional forming methods of deep hole shell copper parts include machining and hot forming. Due to the disadvantages of many production processes, long process flow, high energy consumption, low material utilization rate (less than 50%), and low production efficiency in mechanical processing, it is not conducive to large-scale industrial production; and the deep-hole shell copper prepared by mechanical processing of materials Except that the dimensional accuracy a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C37/00B21C23/20B21J5/08C22F1/08C22F1/02
CPCB21C37/00B21C23/20B21J5/08C22F1/02C22F1/08
Inventor 吴洋陈强舒大禹胡传凯夏祥生
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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