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Vacuum temperature adjustment type extrusion molding method of copper part

A technology of extrusion forming and vacuum, which is applied in the direction of metal extrusion dies, etc., can solve the problems of long process flow, achieve the effects of improving forming precision, improving dislocation density and plastic deformation ability, and preventing oxidation

Inactive Publication Date: 2018-07-24
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

The process of large plastic deformation and annealing can refine the grains of the copper billet, but the process of this method is relatively long

Method used

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  • Vacuum temperature adjustment type extrusion molding method of copper part
  • Vacuum temperature adjustment type extrusion molding method of copper part

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] figure 1 It is a schematic diagram of extrusion molding die device of copper cone with vacuum temperature. Among them, the upper mold is mainly composed of the upper mold plate 1, the upper backing plate with heat insulation 2, the upper mold fixing plate 3, and the punch 4; the lower mold is mainly composed of the lower mold fixing ring 6 with heat insulation, the heating element 7, and the concave mold 8 , Block 10, lower backing plate 11 with heat insulation, lower formwork 12, ejector rod 13 to form.

[0017] The maximum outer diameter of the copper cone extrusion is Φ86.1mm, and the wall thickness is 13mm (such as figure 1 The billet after extrusion), the designed copper billet has a diameter of Φ47.8mm and a height of 77.2mm (such as figure 1 blank before extrusion). The copper billet is cooled to -100°C by liquid nitrogen; then the billet is placed in the cavity of the concave mold, and the temperature of the die is 20°C; then the upper die moves downward to e...

Embodiment 2

[0020] figure 2 It is a schematic diagram of extrusion molding die device for copper arc parts vacuum temperature. Among them, the upper mold is mainly composed of the upper mold plate 1, the upper backing plate with heat insulation 2, the upper mold fixing plate 3, and the punch 4; the lower mold is mainly composed of the lower mold fixing ring 6 with heat insulation, the heating element 7, and the concave mold 8 , Block 10, lower backing plate 11 with heat insulation, lower formwork 12, push rod 13, lower mandrel 14 composition.

[0021] The wall thickness of the copper arc extrusion is 7mm (such as figure 2 The billet after middle extrusion), the maximum wall thickness of the designed copper billet is 11.6mm (such as figure 2 blank before extrusion). The initial temperature of the copper billet is 20°C, and then the billet is placed in the positioning cavity of the lower mandrel. When the upper mold moves downward for 3mm, the upper mold maintains the pressure; then ...

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Abstract

The invention discloses a vacuum temperature adjustment type extrusion molding method of a copper part. The vacuum temperature adjustment type extrusion molding method is characterized by comprising the following steps: putting a copper blank with the initial temperature of -150 DEG C to 20 DEG C into an extrusion lower die cavity; then extruding the blank under the action of an upper die; when the upper die moves to designed displacement, keeping pressure of the blank; the carrying out vacuumizing treatment on a device space where the upper die and a lower die are arranged, wherein the vacuumdegree is -0.095MPa to -0.09MPa; meanwhile, heating the lower die and controlling temperature, wherein the temperature of a concave die is 20 DEG C to 300 DEG C; when the concave die reaches designedtemperature, continually downward moving the upper die and carrying out extrusion deformation on the blank; after the extrusion is finished, pressurizing the device space to atmospheric pressure; then returning back the upper die and taking materials. By adopting the method disclosed by the invention, the deformation capability of metal can be increased and elastic deformation is reduced; the comprehensive performance of the copper part is improved and molding procedures are reduced.

Description

technical field [0001] The invention relates to a method for extruding and forming a copper piece with vacuum and temperature. Background technique [0002] The control of tissue performance and dimensional accuracy is very important for the manufacture of copper parts. The process method of large plastic deformation and annealing can refine the crystal grains of the copper billet, but the process flow of this method is relatively long. At the same time, in the forming process of copper parts, the greater the deformation, the more significant the increase of flow stress, the difficulty of forming, and the large amount of elastic deformation, which has a great influence on the structure performance, especially the dimensional accuracy. Contents of the invention [0003] The object of the present invention is to provide a vacuum-conditioned and temperature-controlled extrusion molding method. [0004] In order to achieve the above purpose, the following technical solutions...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/08B21C25/02B21C29/04
CPCB21C23/001B21C23/08B21C25/02B21C29/04
Inventor 黄树海陈强舒大禹赵祖德胡传凯吴洋夏祥生康凤
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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