基于正交试验和灰色系统理论的拼焊板前纵梁成形优化

影响拼焊板冲压成形的工艺参数较多,难以精确建立工艺参数与成形质量之间的关系。以压边力、拉延筋高度、凸筋圆角半径、凹筋圆角半径为自变量,进行四因素四水平正交试验,模拟拼焊板前纵梁拉延成形过程,获得最大减薄率和最大焊缝移动量的数据。利用灰色系统理论,分别计算成形工艺参数对单目标函数的关联系数和多目标函数的关联度,将多目标转换为以关联度为目标的单目标。进一步计算各成形工艺参数的平均关联度,将优化的压边力、拉延筋截面几何参数进行有限元模拟验证,指导设计、试模,成形的质量得到明显提高。

Optimization of tailor-welded front longitudinal forming based on orthogonal experiment and grey system theory

The tailor-welded blank stamping is a complicated process with numerous forming process parameters,so it is difficult to accurately establish the relationship between the process parameters and the forming quality.The tailor-welded front longitudinal forming was numerically simulated by FEM software while blank holder force,depth,die radius,punch radius of draw bead were independent variables.The data of the maximum thinning and the maximum weld movement were acquired by an orthogonal experiment.Then the grey relational generating between forming process and single objective function,and the grey rational grade of multi-objective were calculated by the grey system theory,thus each multi-objective design could be converted into a single objective design by the grey rational grade.Furthermore the average grey relational grade of the forming process was analyzed.From the optimization data,the front longitudinal forming was numerically simulated which was applied to guide the design and die tryout.The result of blank stamping showed that the forming quality was obviously improved.