车身前壁板拉深型面设计优化及有限元分析

Design and optimization of drawing surface and FE analysis for the front side panel of autobody

采用有限元分析软件Dynaform对车身前壁板的拉深成形过程进行了数值模拟仿真。首先对零件拉深型面进行了设计,重点对工艺补充面形状和拉深筋分布方式进行了优化分析,比较了两种工艺补充面(阶梯式和斜坡式)和三种拉深筋分布方式(封闭式、间断式以及斜拉深筋)状态下零件的应力应变状态以及FLD图,确定了合理的工艺补充面为斜坡式形状,拉深筋分布方式为斜拉深筋,模拟结果表明采用优化的拉深型面可以有效地改善零件角部材料的流动状况,提高成形质量。最后将上述优化的结果应用到实际生产中,得到了合格的零件,验证了优化结果的可靠性。

The drawing process of the front side panel of autobody is simulated by using the finite element software,Dynaform. The drawing surface is designed,focusing on the optimization of the addendum and the drawbead layout. By comparing the stress/strain conditions and the FLD in two types of addendum （stepped and slope） and three types of drawbead layout （closed,discontinuous and oblique drawbead）,the slope addendum is chosen as the optimized addendum and the oblique drawbead is chosen as the optimized drawbead layout. The simulation results show the material flow in the corner and the quality of the part can be improved effectively with the optimized drawing surface. The optimized parameters are employed in production and acceptable quality parts are produced. Therefore,the optimized drawing surface is verified to be effective.