基于正交试验的冲压成形工艺参数多目标优化

Multi-objective optimization on stamping process parameters based on orthogonal test

以某车型的前隔板为研究对象,通过三维建模软件设计工艺补充面和压料面,借助有限软件对其成形工序进行模拟分析。将数值模拟和正交试验设计相结合,采用多目标优化方法优化前隔板零件成形工序的压边力和各段拉延筋阻力系数,得到优化的参数组合为压边力F=500 k N,拉延筋阻力系数K1=0.4,K2=0.4,K3=0.3,K4=0.6。极差分析表明,对最大减薄率影响最大的因素为拉延筋阻力系数K2,对最大增厚率影响最大的因素为拉延筋阻力系数K3。实验结果表明,采用优化后的参数得到实际成形零件无拉裂缺陷且零件厚度满足要求。

For the dash board of automobile,the addendum surface and binder surface were designed by three-dimensional software,and the forming process was simulated and analyzed by finite element software. Combining the numerical simulation with the orthogonal experiment,the blank holder force and resistance coefficient of draw-bead were optimized in the forming process by a multi-objective optimization method. Furthermore,the optimized combination parameters were obtained when F = 500 k N,K1= 0. 4,K2= 0. 4,K3= 0. 3,K4= 0. 6 respectively. The extreme difference analysis shows that the draw-bead resistance coefficient K2 is the biggest influence factor on the maximum thinning rate,and the draw-bead resistance coefficient K3 is the biggest influence factor on the maximum thickening rate.The experimental results show that the part can meet the thickness requirements and avoid cracking after optimization.