薄壁管数控弯曲应变的网格法研究  

Research on Strain Distribution of Thin-walled Tube in NC Bending Process Using Grid Method

作　　者：寇永乐[1] 杨合[1] 詹梅[1] 岳永保[1] 李恒[1] 

机构地区：[1]西北工业大学,西安710072

出　　处：《中国机械工程》2006年第S1期31-34,共4页China Mechanical Engineering

基　　金：国家杰出青年科学基金资助项目(50225518);国家自然科学基金资助项目(59975016;50175092);高等学校优秀青年教师教学科研奖励计划资助项目;高等学校博士学科点专项科研基金资助项目(20020699002)

摘　　要：采用网格法,对50mm×1mm×R100mm(管径×壁厚×弯曲半径)的LF2M和1Cr18Ni9Ti薄壁管数控弯曲中弯管三向应变分布规律进行了研究,结果表明:LF2M弯管最外侧切向拉应变大于1Cr18Ni9Ti弯管的最外侧切向拉应变,而最内侧压应变前者小于后者,导致与1Cr18Ni9Ti弯管相比,LF2M弯管的最外侧壁厚减薄应变大,最内侧增厚应变小;薄壁管小弯曲半径数控弯曲成形中,周向应变不可忽略,其值最大可达最大切向应变的1/3;随着弯曲角度的增大,弯管三向应变均增大,但周向应变增幅小于切向应变与厚向应变的增幅;LF2M弯管切向最外侧拉应变大于其最内侧压应变,1Cr18Ni9Ti弯管切向拉、压应变相差不大,导致前者最外侧壁厚减薄应变大于其最内侧增厚应变,而后者的壁厚减薄应变与增厚应变相差不大。Applying the grid method, the distribution laws of the tangential, hoop and normal strains of LF2M and 1Cr18Ni9Ti tube with 50mm×1mm×R100mm (out diameter × wall thickness × bending radius) have been investigated in the NC bending process. The results show the following: The tangential strain at the extrados of LF2M tube is larger than that of 1Cr18Ni9Ti tube, but the tangential strain at the intrados of LF2M tube is smaller than that of 1Cr18Ni9Ti tube, which leads to that the thinning ratio at the extrado...

关 键 词：薄壁管 数控弯曲 应变 网格法 

分 类 号：TG386[金属学及工艺—金属压力加工]