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针对薄热浸铝镀层钢板冲压过程的过度减薄、起皱等问题,对冲压成形后的汽车发动机隔热罩进行板料厚度值的试验测试分析,利用Autoform软件对其冲压成形过程进行有限元模拟仿真。以减薄率为优化目标,对摩擦系数、压边力、拉延筋拉延系数等参数进行优化设计。研究结果表明:优化后的板料减薄率均有所下降,板料最大厚度减薄由仿真前的-29.75%降至-25.71%,达到零件所要求的5%~-26%,优化效果明显;优化后的摩擦系数由0.135下降为0.1328;拉延系数从0.5下降为0.415,压边力从100 k N增加到114.315 k N。因此,根据有限元模拟优化结果对薄热浸铝镀层钢板的冲压工艺进行优化改进,可以有效预防钢板冲压成形中缺陷的产生。
Aiming at the problems of excessive thinning and wrinkling in the stamping process of thin hot dip aluminum coated steel sheets, the test and analysis of the sheet metal thickness of the automobile engine heat shield after stamping is carried out. The finite element method Simulation. Taking the thinning rate as the optimization objective, parameters such as friction coefficient, blank holder force and drawbead coefficient are optimized. The results show that the optimized sheet reduction rate decreases, and the maximum sheet thickness decreases from -29.75% to -25.71% before the simulation to 5% -26% of the required part. The optimization results Obviously, the optimized friction coefficient decreased from 0.135 to 0.1328, the drawing coefficient decreased from 0.5 to 0.415, and the blank holder force increased from 100 kN to 114.315 kN. Therefore, optimizing and improving the stamping process of the thin hot-dip aluminum-coated steel plate according to the finite element simulation optimization results can effectively prevent the defects in the steel plate stamping.