拉拔铍铜管材残余应力的有限元分析  

Finite element analysis of the residual stress of beryllium bronze tube after drawing process

作　　者：朱宝辉 郭胜利[2] 赵学平[3] 

机构地区：[1]宁夏东方钽业股份有限公司,宁夏石嘴山753000 [2]北京有色金属研究总院加工工程研究中心,北京100088 [3]北京工业大学材料科学与工程学院,北京100022

出　　处：《重型机械》2007年第5期49-52,共4页Heavy Machinery

摘　　要：借助大型非线性有限元软件,应用二维轴对称弹塑性有限元法对拉拔铍铜管的残余应力进行了分析。结果表明,在变形量相同的条件下,拉拔工艺不同,残余应力场有所不相同。空拉拔铍铜管材的外表面为很高的拉应力,内表面为很高的压应力;相对而言,固定短芯头拉拔管材的内外表面残余应力值相差较小且分布较均匀。外模半锥角对固定短芯头拔管材的轴向残余应力具有显著的影响;当半锥角为12°时,拉拔后管材的轴向残余应力值较小且分布均匀。In this article, the residual stress of beryllium bronze tube during drawing process was studied via 2D axisymmertic elastic - plastic FEM, the simulations of drawing beryllium bronze tubes were carried out with the aid of nonlinear FEM software. The simulation results show that, in the same deformation quantity, the residual stress field is different if different drawing technology parameters are taken. The external surface of the tube has very high tensile stress while the internal got rather high compressed stress. Relatively speaking, the drawing for tube with fixed short plug technology would reduce the difference of the residual stress between inside and outside of the tube, and increases its uniformity. We also find that the outer die semi - angle has an obvious effect on the axial residual stress; the axial residual stress shows smaller and uniform when the outer die semi - angle is 12° after drawing.

关 键 词：铍铜管 残余应力 空拔 固定短芯头拉拔 有限元法 

分 类 号：TG359[金属学及工艺—金属压力加工]