铜包铝复合扁线轧制变形行为的数值模拟与实验研究

采用三维刚塑性有限元法,研究铜包铝复合线材由圆断面到扁断面的平辊轧制变形行为及其对主要工艺参数的影响,并对模拟结果进行实验验证.结果表明:铜包铝圆线平辊轧制的宽展率和伸长率与压下率之间存在线性关系;当压下率为17.4%和29.4%时,摩擦因数对铜包铝扁线宽展率的影响很小;当压下率为43%时,随摩擦因数的增加宽展率增大;轧辊直径增大,扁线宽展率呈增大趋势,铜层分布的均匀性提高,但影响较小;在总压下率一定时,采用尽可能少的压下道次可使扁线获得更大的宽展率和更均匀的铜层分布;有限元计算结果与实验结果具有较好的一致性.

Numerical simulation and experimental investigation on rolling behaviors of copper cladding aluminum flat wires

The deformation behaviour of copper cladding aluminum wire in flat rolling process was investigated. The effect of main process parameters on the deformation was analyzed by 3D rigid plastic finite element model combining with experiments. The results show that there is a linear relation between the reduction rate and spread and elongation rate for the copper cladding aluminum flat wires. When the reduction rates are 17.4% and 29.4%, the friction coefficient has a very small influence on the spread rate. When the reduction ratio is 43%, the spread rate increases as the friction coefficient increases. With increasing roller diameter, the spread rate is enhanced and the distribution uniformity of copper layer is improved, but the effect is small. When the total reduction rate is invariable, it is suggested that the flat wire has more spread rate and uniformity of copper layer using possible fewer passes. The reasonable agreement of the FEM predictions and the experimental results is obtained.