基于摄动法的拉弯成形工艺分析  

Perturbance analysis of stretch-bending forming

作　　者：谷诤巍[1] 蔡中义[1] 徐虹[1] 

机构地区：[1]吉林大学材料科学与工程学院,长春130025

出　　处：《清华大学学报（自然科学版）》2009年第5期647-651,共5页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目(50775098);吉林省科技发展计划项目(20060303)

摘　　要：该文介绍了分析拉弯成形的摄动方法。将横向曲率比较小的双凸工件分成与模具表面的接触区和一端受夹钳约束的自由区。假定这2个区的应力-应变状态分量与柱面拉弯成形及均匀拉伸的应力-应变状态分量只相差一个很小的量,建立摄动计算格式,进行变形分析。应用数值模拟软件对拉弯成形件轮廓精度误差的影响因素进行了模拟分析,据此对不锈钢车体的车顶弯梁的拉弯成形进行工艺开发与模具设计,开发出高精度拉弯模具,消除了成形缺陷,获得了高精度高质量的拉弯件。A perturbance method was used to analyze stretch-bending. The convexo-convex work piece with small curvature perpendicular to the pull direction was divided into two areas, one contacting the die surface and the other being the free area restricted on one end by the gripper jaws. The analysis assumes that the components of stress-strain state in the two areas differ slightly from those during stretch-bending over a cylindrical die and in strip stretching and then uses a perturbation to analyze the deformation. The simulation was used to analyze the factors influencing the contour precision error of the strength-bending parts. The strength-bending forming process analysis was used to design a die for the curved roof beam of the stainless steel body of a subway car. The resulting high precision stretch-bending die is free of forming defects and can be used to produce high precision, high quality stainless steel strength-bending parts.

关 键 词：拉弯成形 摄动法 数值模拟 

分 类 号：TG385.2[金属学及工艺—金属压力加工]