背压对等径角挤压坯料变形的影响  

Effect of back pressure on billet deformation during equal channel angular pressing

作　　者：石凤健[1] 江理建[1] 王亮[1] 王莹[1] 王伟[1] 刘智安[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《江苏科技大学学报（自然科学版）》2009年第5期395-398,共4页Journal of Jiangsu University of Science and Technology:Natural Science Edition

基　　金：江苏科技大学本科生创新计划项目

摘　　要：采用有限元方法研究了背压对1100A l等径角挤压的影响.分析了坯料的变形、等效应变分布、最大主应力及变形载荷的变化.模拟结果表明,通过在出口通道施加背压,提高了坯料充填模具外侧拐角的能力,使得坯料横截面上等效应变分布更加均匀;坯料在变形过程中的最大主应力降低;但变形载荷随背压的增加不断增加.分析得出,施加适当的背压有助于提高坯料的变形均匀性,降低坯料表面的开裂倾向.The effect of back pressure on 1100Al was investigated by using finite element inethod during equal channel angular pressing. The billet deformation, effective strain distribution, maximum principal stress, and deformation load were analyzed simultaneously. The results show that the filling of the outer corner is improved and the distribution of the effective strain becomes uniform along the cross-section of the billet by imposing the back pressure. When increasing back pressure, the maximum principal stress decreases, whereas the deformation load increases. Imposing appropriate back pressure is helpful for improving the deformation homogeneity and decreasing the cracking tendency of the billet surface.

关 键 词：等径角挤压 背压 等效应变 变形载荷 最大主应力 

分 类 号：TG376[金属学及工艺—金属压力加工]