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针对某汽车门槛内板成形过程中易发生的起皱和破裂等缺陷,通过正交实验方法进行实验方案设计,并借助板料成形的有限元模拟软件Autoform进行工艺参数优化分析。实验中将拉延成形过程的压边力F、摩擦系数μ和成形时压机下行速度v作为优化因素,以最大起皱准则指标和最大减薄率作为评价目标。采用Design-Expert软件对正交实验结果进行优化处理,得到多目标优化,得出最优的参数组合为:压边力为1.3×106N,摩擦系数为0.125和压机速度为15 mm·s-1。并采用实验进行验证,结果表明有限元模拟结果和实验基本吻合,表明正交实验和多目标优化可以有效地对板料成形进行优化。
Aiming at the flaws such as wrinkling and rupture which are easy to occur during the forming process of an automobile sill inner panel, the experimental design was carried out by orthogonal experimental method. The process parameters were optimized by using the finite element simulation software Autoform of sheet metal forming. In the experiment, the blank holder force F, the friction coefficient μ and the press downstream speed v in the forming process are taken as the optimization factors, and the maximum wrinkle index and the maximum reduction ratio are taken as the evaluation targets. Design-Expert software was used to optimize the orthogonal experimental results to obtain multi-objective optimization. The optimal parameters were obtained as follows: the blank holder force was 1.3 × 106N, the friction coefficient was 0.125 and the press speed was 15 mm · s- 1. The experimental results show that the results of the finite element simulation are in good agreement with the experimental results, which shows that the orthogonal experiment and the multi-objective optimization can effectively optimize the sheet metal forming.