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针对某车型的前隔板冲压件拉延成形出现的破裂缺陷,提出了采用中心复合试验对拉延筋阻力系数进行优化。在板料成形分析软件Auto Form中建立该零件拉延成形的有限元模型,对其进行单因素实验模拟,确定了各段拉延筋的大致取值范围。采用中心复合试验对考虑的因素进行实验设计,并采用有限元软件对所有实验组进行模拟。以最大减薄率和最大增厚率为优化目标建立多目标优化函数,利用Design-Expert试验设计软件求解得最优的拉延筋阻力系数分别为:A=0.25,B=0.45,C=0.30和D=0.30。对最优组参数组进行实验验证,实验结果表明,本文提出的方法能够有效地提高拉延件的成形质量。
Aiming at the rupture defect of the front bulkhead stamping parts of a vehicle, the center composite test is proposed to optimize the drawbead drag coefficient. The forming finite element model of the part was established in the Auto Form of sheet metal forming analysis software. The single factor experimental simulation was carried out to determine the approximate range of drawbead of each section. The central composite experiment was used to experimentally design the factors considered, and all experimental groups were simulated using finite element software. The multi-objective optimization function was established with the optimization of the maximum thinning rate and the maximum thickening rate. The resistance coefficient of the drawbead optimized by Design-Expert test software was A = 0.25, B = 0.45, C = 0.30 And D = 0.30. The experimental results show that the proposed method can effectively improve the forming quality of the drawn parts.