铝合金锭接锭挤压过程中横向焊缝的有限元分析  

3D Finite Element Analysis of Transverse Welding Joint in Aluminum Alloy During Billet-to-billet Extrusion Process

作　　者：刘健[1] 林高用[1] 冯迪[1] 邹艳明[1] 孙利平[1] 

机构地区：[1]中南大学材料科学与工程学院,有色金属材料科学与工程教育部重点实验室,长沙410083

出　　处：《特种铸造及有色合金》2009年第12期1105-1108,共4页Special Casting & Nonferrous Alloys

基　　金：国家科技支撑计划资助项目(2007BAE38BO4)

摘　　要：应用三维有限元法对铝合金锭接锭挤压过程进行了详细分析,探讨了挤压过程中金属的流动规律及横向焊缝的形成过程。模拟结果显示,挤压过程中金属表现为不均匀的流变行为;在新旧坯料接触顶端形成了一个空隙;同时在高压及剪切变形作用下,新旧坯料接触面形成了一条横向焊缝;讨论了横向焊缝质量的影响因素。模拟分析表明,通过改变平锥模的锥面长度,可有效缩短包含横向焊缝的制品长度。Flow behavior and formation of transverse welding joint of aluminum alloy during billet-to-billet extrusion process were investigated by the 3D finite element method.The results show that,the aluminum alloy exhibits heterogeneous rheo-forming behavior during extrusion process,and a gas gap is formed at the interface top of new billet and old billet.Meanwhile,a transverse welding joint can be observed at interface in role of high pressure and shearing deformation.Factors influencing quality of transverse welding joint were described.The simulated results reveal that the product length with transverse welding joint can be greatly shortened by adjusting length of cone surface of the flat cone die.

关 键 词：锭接锭挤压 横向焊缝 三维有限元法 

分 类 号：TG376.2[金属学及工艺—金属压力加工] O242[理学—计算数学]