汽车覆盖件成形数值模拟与模具型面设计

Numerical Simulation of Automobile Panel Forming and Its Die Surface Design

以某汽车覆盖件为研究对象,利用板料分析软件Autoform对其进行了冲压方向的确定、压料面和工艺补充面设计、拉延筋设计以及拉延成形过程的数值模拟。通过仿真预测了板料成形过程中拉裂、减薄、起皱等缺陷,并根据模拟结果分析了板料与凸凹模的摩擦、工艺补充面、压边力、拉延筋等因素对缺陷产生的影响,进而调整优化了板料成形工艺参数和模具型面结构,消除了零件成形中的质量缺陷,提高了成形工艺的可靠性,为实际生产中覆盖件冲压工艺确定和模具型面设计提供了参考和依据。

Taking automobile body panel as an example,the determination of drawing direction,the design of binder surface,addendum surface and draw-bead,and the simulation of drawing process were implemented with the software Autoform.Defects like fracture,thinning and wrinkling in the process of sheet metal forming were predicted.The influence of the factors,like friction between sheet metals and dies,addendum surface,blank holder force,draw-bead and so on,on the defects was analyzed according to the simulation results.Furthermore,the process parameters and the die surface structure were optimized.The quality defects were removed,the reliability of forming process was improved.This supplies a reference and bases for determining process and designing die surface of automobile panel in actual production.