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

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.