A production method of copper-clad aluminum bar with low resistivity

Abstract

The invention discloses a production method for copper-clad aluminum busbars with lower electrical resistivity. The production method for the copper-clad aluminum busbars, disclosed by the invention, comprises the following steps: feeding copper strips and aluminum busbars into a cladding machine for forming and welding, then, rolling and tightening by a cold-rolling mill, and then, sawing according to the required dimension; continuously feeding cut off copper-clad aluminum busbar materials into a medium-frequency heating furnace for preheating so as to adjust the copper-clad aluminum busbar materials to be 300-600 DEG C; then, feeding the copper-clad aluminum busbar materials into a continuous heating furnace, wherein the heating temperature is 300-620 DEG C, and the heating time is 90-120 minutes; then, feeding the copper-clad aluminum busbar materials into hot-rolling mill through roller bed operation for finish rolling and cooling; performing drawing and shaping on the rolled copper-clad aluminum busbar materials; then, putting the copper-clad aluminum busbar materials in a vacuum annealing furnace for bright annealing to obtain the finished product. According to the production method for the copper-clad aluminum busbars, disclosed by the invention, a copper layer coats an aluminum core; the cost is low, continuous production can be performed, the process flow is short, and the production efficiency is high; all mechanized operation is adopted, so that the interface bonding strength is high, and the requirement of electrical equipment can be completely 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 row. 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

[0004] The production of copper-aluminum composite row products abroad generally adopts the hydrostatic extrusion technology, which is to make copper and aluminum composite billets, 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.

[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