基于有限元仿真的5083铝合金支架超塑性差温拉深

Superplastic differential temperature drawing of 5083 aluminum alloy bracket based on finite element simulation

为提供试验依据,应用IA软件计算零件毛料尺寸,导入MSC.Marc软件模拟超塑差温拉深,并依据模拟结果优化毛料尺寸。模拟中温度分若干梯度,假定材料同梯度内同力学性能,利用二次开发将各梯度材料本构关系植入模拟,获得5083铝合金支架超塑差温拉深成形工件及壁厚分布,其结果与试验吻合良好,且较恒温拉深理想。讨论了成形温度梯度宽对差温拉深模拟结果的影响。

To provide the basis for experiment, superplastic differential temperature drawing was simulated in software MSC. Marc with initial blank calculated by software IA and the shape of blank was optimized according to the simulation results. In this simulation, forming temperature was divided into some gradients and it was assumed that material property behaved similarly in the same gradient. The assumption was implanted in software MSC. Marc through new complied subroutine about constitutive equation. Under the guide of the analysis, a 5083 aluminum alloy bracket was successfully manufactured. Good agreement was obtained between the predicted profile based on simulation and measured thickness distribution. Moreover, the results of differential temperature drawing were compared with one of isothermal drawing. The influence of temperature grads on the predicted result was also discussed.