Abstract:

The longitudinal springback and undercut problem of HSS(high strength steel) rail panels was prevalent in their forming.It is difficult to solve the problem like estimation and compensation of springback with the existing 2D sectional method.Thus,the existing method was corrected and revised based on longitudinal
springback and undercut of rail panels.The revised method took into account longitudinal springback of key sections.It also corrected compensation algorithm of sections.In order to improve the efficiency and precision of iteration,a revised method introduced material coefficient and energy coefficient to ensure rationality and feasibility of algorithm.According to different wall sprigback modes,the revised method took into account angle springback and curl springback of different deformation modes.Taking a typical welded rail panel for example,the existing 2D sectional method and the revised method were compared on estimation and compensation of springback.Practice proves the feasibility of the revised method. 

Key words: longitudinal springback, undercut, 2D sectional method, correction

摘要：

针对现有的二维截面法预测、补偿回弹时无法有效地解决高强度汽车梁类件在成形后出现的纵向回弹及冲压负角问题,提出了修正算法对原算法进行修正及补充。修正后的算法充分考虑了各个关键截面的纵向回弹，针对迭代效率及精度，在补偿算法基础上引入了材料系数及能动系数来保证算法的合理性和可行性。根据侧壁角度回弹及卷曲回弹的不同变形模式,对补偿算法进行了考虑冲压负角的修正及补充。以某典型拼焊板汽车梁类件为例，对修正前后的二维截面算法进行了对比，实验结果证明了修正算法的可行性。


关键词: 纵向回弹, 冲压负角, 二维截面法, 修正