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A kind of extrusion processing method of copper-chromium alloy

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

Active Publication Date: 2016-02-03
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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  • A kind of extrusion processing method of copper-chromium alloy
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Use fusion casting method to prepare 76mm×160mmCuCr(25) alloy ingot;

[0034] 2) Car polish the surface of the spindle and remove the surface slag. 69mm×130mmCuCr(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. The mass percentage is: 70:24:6;

[0037] 5) Put the ingot into the 800T extruder according to the direction of the end covered with the copper plate facing the extrusion die. The extrusion die is a cone die, and the inner diameter of the extrusion cylinder 71mm, sizing hole of extrusion die 32mm, that is, the extrusion ratio is 5, the cone angle 2α is 75°, the length of the sizi...

Embodiment 2

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

[0040] 2) Car polish the surface of the spindle and remove the surface slag. 69mm×130mmCuCr(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. The mass percentage is: 60:36:4;

[0043] 5) Put the ingot into the 800T extruder according to the direction of the end covered with copper skin facing the extrusion die. The extrusion die adopts a cone die, and the inner diameter of the extrusion cylinder 71mm, sizing hole of extrusion die 35mm, that is, the extrusion ratio is 4, the cone angle 2α is 70°, the length of th...

Embodiment 3

[0045] 1) Use the infiltration method to prepare 72mm×140mmCuCr(50) alloy ingot;

[0046] 2) Car polish the surface of the spindle and remove the surface slag. 64mm×110mmCuCr(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 pipe. The lubricant is composed of No. 45 engine oil, graphite powder, and zinc stearate. The mass percentage is: 65:30:5;

[0049] 5) Put the ingot into the 800T extruder according to the direction that the end of the copper tube is covered with the copper tube facing the extrusion die for extrusion. The extrusion die adopts a cone die, and the inner diameter of the extrusion cylinder Sizing hole of extrusion die That is, the extrusion ratio is 3.5, the taper angle 2...

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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 the extrusion processing of a copper-chromium alloy. 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, it is represented by CuCr (50)) material (CuCr replaces copper chromium below) has high voltage strength and breaking current capability It is widely used in vacuum circuit breakers. It is the main contact material for vacuum circuit breakers and the preferred contact material for vacuum switches. In the prior art, CuCr contact material preparation processes mainly include solid-phase sintering method, infiltration method, melting-casting method and vacuum arc smelting method. Among them, the solid-phase sintering method has the lowest cost but the worst performance, and the infiltration method and melting-casting meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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