(北京科技大学 新材料技术研究院，北京 100083)
摘 要: 对铜包铝复合棒材平辊冷轧时的金属流动进行数值模拟和实验研究。结果表明：由圆断面至扁断面的第一道次平辊轧制中侧边以变形宽展为主；在后续道次的平辊轧制过程中，滑动宽展的影响增大，侧边变形宽展的影响减小；当压下率为13.3%~26.7%时，摩擦因数对铜包铝棒材宽展率的影响较小，而当压下率大于33.3%时，摩擦因数对宽展的影响增大；铜包铝复合棒材的最大轧制压力在轧制入口端，断面上存在一条“X”状的等效应变带。实验结果与有限元分析结果具有良好的一致性。采用合适的轧制工艺，可获得铜包覆层分布均匀、铜铝复合界面无裂纹和分层、表面质量好的扁排。
关键字: 铜包铝复合棒；有限元分析；平辊轧制；宽展
copper cladding aluminum composite rods
（Advanced Materials and Technology Institute, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Combining finite element simulation with experiments, the metal flow behavior in cold flat rolling of copper cladding aluminum(CCA) composite rod was investigated. The results show that sidepiece deformation spreading is dominant in the first flat rolling pass. However, in the later passes, the influence of slip spreading enhances while the influence of sidepiece deformation spreading reduces. When the rolling reduction ratio is in the range of 13.3%−26.7%, the influence of friction factor on lateral spreading rate is small, but when the ratio is larger than 36.7%, the influence increases. The maximum pressure lies at the entry of rod rolling. There is an “X” like equivalent strain zone in the section. Reasonable agreement of the FEM analysis and the experimental results is obtained. CCA flat bar that has clean surface quality and uniform thickness of copper cladding layer, without crack and layer at the composite interface, can be prepared by property rolling process.
Key words: copper cladding aluminum composite rod; finite element analysis; flat rolling; spreading
