(北京科技大學(xué) 新材料技術(shù)研究院，北京 100083)
摘 要: 對銅包鋁復(fù)合棒材平輥冷軋時(shí)的金屬流動(dòng)進(jìn)行數(shù)值模擬和實(shí)驗(yàn)研究。結(jié)果表明：由圓斷面至扁斷面的第一道次平輥軋制中側(cè)邊以變形寬展為主；在后續(xù)道次的平輥軋制過程中，滑動(dòng)寬展的影響增大，側(cè)邊變形寬展的影響減小；當(dāng)壓下率為13.3%~26.7%時(shí)，摩擦因數(shù)對銅包鋁棒材寬展率的影響較小，而當(dāng)壓下率大于33.3%時(shí)，摩擦因數(shù)對寬展的影響增大；銅包鋁復(fù)合棒材的最大軋制壓力在軋制入口端，斷面上存在一條“X”狀的等效應(yīng)變帶。實(shí)驗(yàn)結(jié)果與有限元分析結(jié)果具有良好的一致性。采用合適的軋制工藝，可獲得銅包覆層分布均勻、銅鋁復(fù)合界面無裂紋和分層、表面質(zhì)量好的扁排。
關(guān)鍵字: 銅包鋁復(fù)合棒；有限元分析；平輥軋制；寬展
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
