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Extrusion machining method of copper-chromium alloy

A copper-chromium alloy, extrusion processing technology, applied in electrical components, electrical switches, circuits and other directions, can solve the problems of high manufacturing cost, low yield, easy cracking, etc., to reduce production costs, improve yield, extrusion low pressure effect

Active Publication Date: 2014-02-26
桂林金格电工电子材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2) Although CuCr contacts of solid phase sintering method are easy to be made into small-sized contacts, they cannot meet the requirements of switches such as vacuum contactors due to their low performance;
[0006] 3) Although the CuCr material of the infiltration method can be processed into small-sized contacts through single-piece pressing and infiltration, the material utilization rate and production efficiency are low, and the manufacturing cost is high, so it cannot be applied;
[0007] 4) Although CuCr ingots by infiltration method, melting casting method or vacuum arc melting method can be processed into small-sized contacts by traditional hot forging methods, because Cu-Cr is basically insoluble in solid state, the Cu-Cr phase interface is very weak, The plasticity of the material is poor, and it is easy to crack during hot forging deformation, resulting in low yield and high manufacturing cost, so it cannot be used
[0008] The domestic master's degree thesis "Cu-Cr-Zr and Cu-(30%-50%) Cr Material Plastic Deformation and Microstructure Performance Research" mentioned the hot extrusion processing method of CuCr, but it is only limited to the experimental stage. Failure to adopt hot extrusion processing method to produce CuCr contacts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Prepared by melting and casting method 76mm×160mm CuCr (25) alloy ingot;

[0034] 2) Polish the surface of the spindle to remove the slag on the surface to obtain 69mm×130mm CuCr (25) alloy ingot;

[0035] 3) Use a copper plate with a thickness of 0.40mm and a hardness of HB75 to tightly cover the cylindrical surface of the spindle and one end surface, and use argon arc welding to weld the copper plate at the junction;

[0036] 4) Apply a layer of lubricant with a thickness of about 0.4mm evenly on the outside of the copper plate. The lubricant is composed of No. 45 engine oil, graphite powder, and zinc stearate, and its mass percentage is: 70:24:6;

[0037] 5) Put the ingot on the 800T extrusion machine according to the direction of the copper plate-coated end facing the extrusion die. The extrusion die adopts a cone die, and the inner diameter of the extrusion cylinder is 71mm, sizing hole of extrusion die 32mm, that is, the extrusion ratio is 5, the cone a...

Embodiment 2

[0039] 1) Prepared by arc melting method 76mm×160mm CuCr (40) alloy ingot;

[0040] 2) Polish the surface of the spindle to remove the slag on the surface to obtain 69mm×130mm CuCr (40) alloy ingot;

[0041] 3) Use a copper skin with a thickness of 0.50mm and a hardness of HB130 to tightly cover the cylindrical surface of the spindle and one end surface, and use argon arc welding to weld the copper skin at the junction;

[0042] 4) Apply a layer of lubricant with a thickness of about 0.3mm evenly on the outside of the copper skin. The lubricant is composed of No. 45 engine oil, molybdenum disulfide powder, and zinc stearate, and its mass percentage is: 60:36:4;

[0043] 5) Put the ingot on the 800T extruder according to the direction of the copper skin-coated end facing the extrusion die. The extrusion die adopts a cone die, and the inner diameter of the extrusion cylinder is 71mm, sizing hole of extrusion die 35mm, that is, the extrusion ratio is 4, the cone angle 2α ...

Embodiment 3

[0045] 1) Prepared by infiltration method 72mm×140mm CuCr (50) alloy ingot;

[0046] 2) Polish the surface of the spindle to remove the slag on the surface to obtain 64mm×110mm CuCr (50) alloy ingot;

[0047] 3) Use a copper tube with a thickness of 0.75mm and a hardness of HB100 to tightly cover the cylindrical surface of the spindle and one end surface, and use argon arc welding to weld the copper tube at the junction;

[0048]4) Apply a layer of lubricant with a thickness of about 0.2mm evenly on the outside of the copper tube. The lubricant is composed of No. 45 engine oil, graphite powder, and zinc stearate, and its mass percentage is: 65:30:5;

[0049] 5) Put the ingot on the 800T extruder according to the direction of the copper pipe-coated end facing the extrusion die. The extrusion die adopts a cone die, and the inner diameter of the extrusion cylinder is Extrusion die sizing hole That is, the extrusion ratio is 3.5, the cone angle 2α is 65°, the length of the...

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Abstract

The invention discloses a machining method of a copper-chromium alloy contact material, and particularly relates to extrusion machining on copper-chromium alloy. CuCr ingots are extruded and machined into small bars through an infiltration method or a casting method or a vacuum arc smelting method at indoor temperature, wherein the chromium content of the CuCr ingots ranges from 25% to 50% by mass, deformation is uniform, the structure property of CuCr can be remarkably improved, and small CuCr contacts can be manufactured, and the using requirements of small-power vacuum switches such as vacuum contactors are met.

Description

technical field [0001] The invention relates to a processing method of a copper-chromium alloy contact material, in particular to extrusion processing of the copper-chromium alloy, and the method is extrusion at room temperature. Background technique [0002] Copper chromium (CuCr, chromium content: 25%-50% mass fraction, if the chromium content is 50% mass fraction is represented by CuCr (50)) material (hereinafter referred to as CuCr instead of copper chromium) has high withstand voltage strength and breaking current capability It is widely used in vacuum circuit breakers and is the main contact material for vacuum circuit breakers and the preferred contact material for vacuum switches. In the prior art, there are mainly four methods for preparing CuCr contact materials: solid phase sintering, infiltration, casting and vacuum arc melting. Among them, solid phase sintering has the lowest cost but the worst performance, and infiltration and casting The performance of the Cu...

Claims

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Application Information

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IPC IPC(8): H01H11/04
Inventor 陈名勇颜培涛覃绍培唐更生林毓叶凡
Owner 桂林金格电工电子材料科技有限公司
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