车身零件拉延成形缺陷控制和工艺参数优化

起皱和拉裂缺陷是汽车车身零件在拉延成形中常见的成形缺陷。为了控制拉延成形缺陷,以某汽车发动机盖内板件为研究对象,通过Autoform建立有限元模型,并借助Design-Expert进行实验设计。采用数值模拟软件和实验设计方法对汽车发动机盖内板件的拉延筋阻力系数和压边力参数进行优化。优化后的最优参数组合为:拉延筋的阻力系数大小分别为A=0.3,B=0.3,C=0.4,压边力大小D=1.25×10~3kN。采用优化后的参数进行实验,实验得到零件无拉裂和起皱缺陷,表明本文采用的方法可以有效地控制车身零件拉延成形中的缺陷。

Defect control and process parameters optimization on drawing process of automotive panel

Crackle and wrinkle are the common defects in the drawing process of automotive panel parts.In order to control the defects in the drawing process, for an automotive engine cover panel, the finite element model was set up by Autoform software, and the experimental design was carried out by Design-Expert software.The resistance coefficient of drawbeads and parameters of blank holder force for automotive engine cover panel were optimized by the numerical simulation software and the experiment design method.The optimized parameters are as following: the resistance coefficient of drawbeads are A=0.3, B=0.3, C=0.4, and the blank holder force is D=1.25×103 kN.Furthermore, the optimized parameters were verified in test, and the forming parts were obtained without crackle and wrinkle defects.Thus, this method can effectively control the forming defects in the drawing process of automotive panel parts.