拉弯成形的数值分析与工艺优化  

Numerical analysis and optimization of stretch-bending process

作　　者：谷诤巍[1] 蔡中义[2] 徐虹[1] 

机构地区：[1]吉林大学材料科学与工程学院,长春130022 [2]吉林大学辊锻工艺研究所,长春130022

出　　处：《吉林大学学报（工学版）》2009年第5期1167-1171,共5页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(50775098);吉林省科技发展计划项目(20050303)

摘　　要：介绍了分析拉弯成形的摄动方法。对于横向曲率比较小的双凸工件,将其分成两个区,一个是与模具表面的接触区,另一个是一端受夹钳约束的自由区。假定这两个区的应力-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不锈钢车体的车顶弯梁的拉弯成形进行了数值模拟与工艺参数优化,消除了成形缺陷,开发出高精度拉弯模具,获得了高质量的成形件。A perturbanee method to analyze the process of stretch-bending is introduced in this paper. For the convexo-convex workpiece with small curvature in across to the pull direction, it is divided into two areas, one is the area contacting the die surface and the other is the free area restricted on the one end by gripper jaws. Based on the assumption that the components of stress-strain state in the two areas are different from those in stretch-bending over cylinder die and strip stretching by additional small values, the perturbed solution is build and the deformation is analyzed. Using the numerical simulation software, the stretch-bending process of the roof curve beam of the stainless steel body of subway cars is studied and the technological parameters are optimized, the forming defect is eliminated and the stretch-bending die with high precision is developed, and quality stainless steel parts are made finally.

关 键 词：拉弯成形 摄动法 型材 数值模拟 

分 类 号：TG302[金属学及工艺—金属压力加工]