某新能源汽车外板件的工艺参数优化

Optimization on process parameters for outer panel of a new energy vehicle

针对某新能源汽车车尾门外板成形过程中易发生的起皱、破裂和成形不足等缺陷,借助试验软件Design-Expert和数值模拟软件Auto Form对该车尾门外板进行试验设计。试验设计时,将摩擦系数μ和成形时的压机下行速度v、压边力F_b作为优化因素,以最大减薄率、最大增厚率和成形不足比作为评价目标,对其工艺参数进行优化,借助多目标优化,得出最优的参数组合为:摩擦系数μ=0.15、成形时的压机下行速度v=10 mm·s^(-1)、压边力F_b=1.6×10~3k N。最后采用试模进行验证,并对得到的零件进行检测,零件无拉裂和起皱缺陷,且成形充分,表明本文所提出的方法可以有效地为汽车外板件模具开发提供参考。

For the defects of wrinkling,rupture and inadequate forming produced in the forming process for the outer panel of a new energy vehicle,experience design was conducted by Design-Expert software and finite element simulation software Auto Form. Then,friction coefficient μ,press down speed v and blank hold force Fb were set as influence factors,and the maximum thinning rate,the maximum thickening rate and the forming defect ratio were used as the target. Therefore,the process parameters were optimized. Furthermore,the optimal parameter combination was obtained by multi-objective optimization with μ = 0. 15,v = 10 mm·s^-1,Fb= 1. 6 × 10~3 k N. Finally,the test mode was verified,and parts without crack and wrinkle defects are formed fully. Thus,the proposed method can provide reference for the development of vehicle outer panel parts effectively.