拼焊板覆盖件成形过程中的焊缝移动和成形性能  

WELD-BEAD MOVEMENT AND FORMABILITY OF TAILOR-WELDED BLANKS DURING FORMING AUTOMOBILE PANELS

作　　者：陈炜[1] 杨继昌[1] 林忠钦[2] 

机构地区：[1]江苏大学机械工程学院,镇江212013 [2]上海交通大学机械与动力工程学院,上海200030

出　　处：《机械工程学报》2004年第9期62-66,共5页Journal of Mechanical Engineering

基　　金：中国博士后科学基金(中博基[2001]14号);江苏省自然科学基金(BK2002009)资助项目

摘　　要：焊缝移动以及与此相关的成形性能下降是拼焊板覆盖件零件成形过程中需要解决的难题。推导了横向受拉情况下拼焊板焊缝移动量的计算公式;在分析汽车门内板零件特点的基础上,确定拼焊板材料和焊缝位置,提出“阶梯压边圈”和“阶梯压边圈+焊缝夹紧柱”两种控制焊缝移动的工艺方案;应用动力显式数值模拟软件,分析了阶梯压边圈和焊缝夹紧柱对焊缝移动量的影响;通过减少焊缝移动量,在成形极限图、应力分布、应变分布和厚度减薄率这四个方面改善拼焊板的成形性能。Weld-bead movement and poorer formability are the urgent problems that need solving during forming automobile panels with tailor-welded blanks (TWBs). Calculating formula for weld-bead movement of TWBs in transverse uniaxial stretching is deduced. Based on analyzing the characteristics of automobile door-inner, two sheet metal and the position of weld-bead are determined, and two schemes of forming processes are put forward, which are ' step blank-holder ' and ' step blank-holder & weld-bead clamping bar '. By means of dynamic finite element method, the effects of step blank-holder and weld-bead clamping bar on weld-bead movement are researched. After decreasing weld-bead movement, the formability of tailor-welded blanks is greatly improved according to the forming limited diagram, stress distribution, strain distribution and thickness thinning.

关 键 词：拼焊板 覆盖件 焊缝移动 成形性能 

分 类 号：TG376[金属学及工艺—金属压力加工]