Method for producing copper-clad aluminum bar

Abstract

The invention relates to a method for producing a copper-clad aluminum bar. The method comprises the following steps of: removing oxidation layers from the surfaces of a copper belt and an aluminum bar; feeding the copper belt and the aluminum bar into a cladding machine for molding and welding; rolling and tightening by using a cold-rolling mill; saw-cutting according to a required size, and continuously feeding copper-clad aluminum bar materials which are cut off into an intermediate-frequency heating furnace for pre-heating; feeding the copper-clad aluminum bar materials into a continuous heating furnace; operating the copper-clad aluminum bar materials through a roller bed and then feeding the copper-clad aluminum bar materials into a hot-rolling mill for finish rolling and cooling; drawing and setting the rolled copper-clad aluminum bar materials, and performing fixed-length saw-cutting according to a process; putting the copper-clad aluminum bar materials which are subjected to the fixed-length cutting into a vacuum annealing furnace, performing bright annealing, and thus obtaining a finished product; and putting the finished product on an automatic packaging line, packaging the finished product and then warehousing. By coating a copper layer outside an aluminum core, the method for producing the copper-clad aluminum bar has the advantages of low cost, continuous production, short process flow, high production efficiency, mechanical operation and high bonding strength of interfaces; and requirements of electric equipment can be met.

Description

technical field [0001] The invention relates to a production method of a copper-clad aluminum bar. Background technique [0002] 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, and its carrying capacity is 90.7% of pure copper bars. , When selecting, increase the cross-sectional area by about 10% to fully achieve the same ampacity as pure copper, and its mechanical and electrical properties can meet custome...

AI Technical Summary

Problems solved by technology

[0003] The production of copper-aluminum composite row products abroad generally adopts the hydrostatic extrusion technology, which is to make copper and aluminum composite blanks, and use high hydrostatic pressure and large processing deformation rate to realize the solid-phase combination between copper and aluminum, deformation Uniform, but not continuous production, low production efficiency

The technology adopted in China is the airtight casting method, which has high cost, large loss, complicated process requirements, high manufacturing cost, and is not suitable for mass production, and cannot truly achieve energy saving and environmental protection.

[0004] 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