可控拉深筋对高强度板盒形件拉深性能的影响

Effect of controllable drawbead on the formability of high strength steel box

应用模拟仿真技术,结合正交实验设计方法,通过6种不同形状的拉深筋和3种不同的拉深筋运动轨迹的高强度板盒形件的拉深成形模拟仿真,研究了可控拉深筋对高强度板盒形件拉深性能的影响。以极限拉深深度为评价指标,分析结果数据,得到轨迹二拉深筋上升—静止—下降为最优运动轨迹,并且3种可控拉深筋运动轨迹的指标均比固定拉深筋的大,证明可控拉深筋能够改善高强度板的成形性能。其中直球头拉深筋的改善效果比斜球头显著,但斜球头比直球头具有更好的极限拉深高度,并通过极差分析得到其主要影响因子为拉深筋前后的高度。最后通过成形力分析,解释了改变拉深筋高度能改善高强度板成形性能的原因。

With the application of simulation technology and orthogonal test,the effects of controllable drawbead on the formability of HSS（high strength steel） box are researched through the simulation of HSS box with 6 different drawbead shapes and 3 different drawbead trajectories.Use the limit drawing height as the evaluate indicator,it is proofed that the controllable drawbead can improve the formability of HSS by analyzing the result data that three types of controllable drawbead trajectories indicators are bigger than the immovable ones.And the 2nd trajectory,ascent—halt—descent is determined as the optimal type.The improve scales of straight drawbeads is better than the oblique drawbead,whereas the latter ones have better target.The main influence factors are obtained by range analysis.At last the reason that accounts for controllable drawbead can improve the formability is got the answer by the forming force analysis.