Method for producing copper-coated aluminum bus bar of low specific resistance and good plasticity and tenacity

Abstract

The invention provides a method for producing a copper-coated aluminum bus bar of low specific resistance and good plasticity and tenacity. The method comprises the following steps that a copper strip and an aluminum bus bar are conveyed into a coating machine to be formed and welded, the copper strip and the aluminum bus bar are rolled and tightened through a cold mill, and then the copper strip and the aluminum bus bar are cut according to needed sizes; secondly, cut copper-coated aluminum bus bar materials are continuously fed into an intermediate-frequency heating furnace to be preheated for 60 to 150 seconds, and the temperature of the sawn copper-coated aluminum bus bar materials is adjusted to 300 to 600 DEG C; thirdly, the copper-coated aluminum bus bar materials are fed into a continuous heating furnace to be heated for 90-120 minutes at the temperature of 300-620 DEG C; fourthly, the copper-coated aluminum bus bar materials are conveyed into a hot mill through a roller bed for fine rolling and cooling, the rolled copper-coated aluminum bus bar materials are drawn and shaped, then the copper-coated aluminum bus bar materials are sent into a vacuum annealing furnace to be bright-annealed, and then finished products are obtained. According to the method for producing the copper-coated aluminum bus bar of low specific resistance and good plasticity and tenacity, an aluminum core is covered by a copper coating, cost is low, continuous production can be conducted, the technological process is short, the production efficiency is high, mechanical operation is adopted in the whole process, the interface combination strength is high, and the requirements of electric devices can be met.

Description

[0001] This application is a divisional application, the application number of the original application: 201110250139.8, the application date: 2011-08-26, the name of the invention: the production method of copper-clad aluminum bar. technical field [0002] The invention relates to a production method of a copper-clad aluminum bar. Background technique [0003] Copper-clad aluminum bar is a kind of bimetal with aluminum as the base and copper on the outer layer to form a permanent interatomic metallurgical bond between them. The surface is bright, round and free of defects. It is a new type of conductor material that combines the high-quality and stable electrical conductivity of copper with the low-cost energy of aluminum and the low contact resistance. It can completely replace pure copper bars. The weight ratio of copper-clad aluminum bars is: copper accounts for 40%, aluminum accounts for 60%. Under the same specifications, it is 2-2.5 times longer than pure copper bars,...

AI Technical Summary

Problems solved by technology

[0005] The shortcomings of the copper clad aluminum bar in the above prior art are: the existing production process, the metallurgical bonding between aluminum and copper is poor, resulting in increased contact resistance; deformation resistance and plasticity are poor, and the resistivity is high. The mechanical properties of the workpiece often cannot meet the needs, how to solve these problems is a technical problem in this field