汽车中通道拉延成形工艺参数多目标优化

Multi-objective optimization on drawing technological parameters of medium channel part

针对某车型中通道零件易出现拉裂和起皱等缺陷,提出通过工艺分析和工艺补充面设计来得到零件的成形工艺流程和工艺补偿面。借助AutoForm软件,建立中通道的拉延成形工序的有限元模型,通过初步模拟,确定以压边力、摩擦系数和拉延筋阻力系数作为试验因素,通过正交试验设计,以优化拉延成形工艺参数。试验中,以最大减薄率和起皱趋势评价函数作为优化的目标函数,并采用多目标优化方法,获得最优的工艺参数组合。实际试模中采用优化后的参数进行试验,得到中通道的产品区域无拉裂和起皱缺陷。

For the defects of medium channel part prone to crack and wrinkle, the forming process and addendum surface were obtained by process analysis and addendum design. Then, the drawing process model was established by the finite element software Autoform, and the blank hold force, friction coefficient and resistance coefficient of drawbeads were chosen as the influence factors after preliminary simulation. Furthermore, an orthogonal test was designed to optimize the drawing process parameters. The maximum thinning rate and wrinkling evaluation function were chosen as the optimized objective functions, and the optimal combination of process parameters was obtained by the multi - objective optimization method. The optimized parameters were used in the die tryout, and the medium channel part without crack and wrinkle defects could be obtained.