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Method for producing modified half-hollw section of pure copper

A manufacturing method, semi-hollow technology, applied in wire drawing dies, metal extrusion dies, etc.

Active Publication Date: 2004-10-27
董云伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the method provided by the present invention, the existing production process problems are solved by changing the mold structure, so that the manufacture of pure copper semi-hollow profiles for electrical purposes can be easily extruded like ordinary solid profiles, and can be easily stretched like pipes , and the accuracy is much higher than that of pipe

Method used

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  • Method for producing modified half-hollw section of pure copper
  • Method for producing modified half-hollw section of pure copper
  • Method for producing modified half-hollw section of pure copper

Examples

Experimental program
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Effect test

Embodiment 1

[0067] A method for manufacturing a C-shaped high-precision pure copper semi-hollow profile, the method includes the following processing techniques:

[0068] 1. Hot extrusion process of V-shaped billet with enlarged opening

[0069] Heat a 46kg ingot weighing 46kg that meets the quality standard of pure copper for electricians to about 850°C, and use a V-shaped hot extrusion die (32) to Produced by conventional hard mold hot extrusion process. The die cavity of V-type hot extrusion die (32) is V-shaped, and its opening is greater than the opening that C section bar requires. The ratio of the area A enclosed by the tongue of the mold to the tongue base (6) and the area W of the axial section (10) of the width of the tongue base is less than or equal to 1.0.

[0070] The V-type hot extrusion die (32) is positioned with the tongue-shaped die holder (33) by the positioning pin hole (5), and is connected as a whole.

[0071] The outlet cone (8) is used to reduce extrusion resis...

Embodiment 2

[0083] A method for manufacturing a C-shaped high-precision pure copper semi-hollow profile. In addition to using a 32kg pure copper ingot for processing, the hot extrusion die, cold drawing combination die and subsequent auxiliary straightening and shaping used in the rest of the processing process Process conditions such as machine are all with embodiment 1.

[0084] Enhanced by the die holder in Figure 5 Figure 4 The V-shaped hot extrusion die shown can be hot-extruded to obtain 27.5kg of V-shaped billet with stable dimensions and high precision. The yield of the billet is 85%. The wall thickness tolerance of the billet is less than 2.5%. 15% machining margin; passed Image 6 The cold drawing combined die shown, according to Figure 7 The cold stretching process for processing semi-hollow profiles shown in the figure can obtain 25kg of high-precision C profiles, with a yield of 90%, and the wall thickness tolerance of C profiles is less than 2.5%. It is carried out on t...

Embodiment 3

[0087] A method for manufacturing a fork-shaped pure copper semi-hollow profile, the processing technology of this method is similar to that of Embodiment 1. When processing a 60kg ingot weighing 60kg in accordance with the quality standard of pure copper for electricians, when processed under the same conditions as in Example 1, the fork-shaped pure copper material used by processing the fork-shaped pure copper material shown in Figure 10 reinforced by the mold holder shown in Figure 11 Approximate V-shaped hot extrusion die can be hot-extruded to obtain 54kg of fork-shaped blanks (approximately V-shaped or Y-shaped) with stable dimensions and high precision, and the blank yield is 90%. The blank has more than 25% processing allowance for further cold forming, and sufficient cold working allowance is to ensure that the fork profile has a thickness of 300N / mm 2 The above necessary conditions for high strength.

[0088] By processing the fork-type pure copper semi-hollow profi...

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Abstract

An improved technology for manufacturing the semi-hollow copper section includes hot extrusion with V-shaped hot extrusion die and cold drawing with a combined die composed of the core die with drawing rod and key and the external die with locating slot and coiled opening. Its advantages are long service life of its dies, high utilization rate of raw material, and high precision and strength of product.

Description

technical field [0001] The invention relates to a manufacturing method of a pure copper semi-hollow profile, in particular a method for producing a high-precision pure copper semi-hollow profile for electrician use by a single-action hot extrusion process and a stretching process with a mandrel, belonging to metal processing, field of manufacturing technology. Background technique [0002] Pure copper has excellent electrical conductivity second only to silver, the crystal is face-centered cubic, and has good cold and hot plastic processing performance; and the stacking fault energy is low, dislocations are easy to expand and accumulate, the work hardening rate is large, and the mechanical properties of the product are easy control. The chemical properties of pure copper are stable, and it is basically not corroded in the atmosphere, water, and water vapor; in the marine climate, a dense protective film can also be formed on the surface of pure...

Claims

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Application Information

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IPC IPC(8): B21C1/00B21C3/02B21C23/02B21C25/02B21D3/00
Inventor 董云伟
Owner 董云伟
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