模具外接圆弧角对纯铝ECAE影响的有限元分析  

Finite Element Analysis for the Influence of Curvature Angle ψ of the Outside Corner on ECAE of Pure Aluminum

作　　者：吴炬[1] 向国权[1] 程先华[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200030

出　　处：《上海交通大学学报》2005年第7期1063-1065,共3页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(A50071034)

摘　　要：运用有限元方法对纯铝的等径弯角挤压(ECAE)过程进行了模拟计算,探讨了挤压通道外接圆弧角ψ对挤压载荷及试样变形均匀度的影响.结果表明:随着ψ角的增加,通道壁支反力的水平分量随之增大,有助于试样的变形流动,从而降低挤压载荷的大小;试样在剪切变形区所受到的滑动摩擦力也随ψ角的增加而增大.同时,由于ψ弧段的存在,试样底部产生弯曲变形而形成不均匀变形区,均使等效应变分布的不均匀度增加.The equal channel angular extrusion（ECAE） process of pure aluminum was simulated with finite element method. The influence of the curvature angle φ of the outside corner on the extrusion load and the deformation uniformity was discussed. The results indicate that the horizontal component of reaction force from the die wall increases with the angle φ, which is helpful for the deformation of billet. Consequently the extrusion load decreases with angle φ. The sliding frictional resistance on the shear deformation zone increase with angle φ. Because of the arc of curvature （φ）, the lower part of billet is subjected to bending deformation, which results in the zone of non-uniform deformation. Therefore, the nonuniformity of the equivalent strain distribution increases with angle φ.

关 键 词：纯铝 等径弯角挤压 通道角度 挤压载荷 等效应变 

分 类 号：TG372[金属学及工艺—金属压力加工]