铝合金型材多点拉弯成形的数值模拟

多点成形技术的核心是实体模具被离散的多点模具代替,实现了柔性成形。铝合金型材的拉弯成形中,可以用多点模具代替实体模具,实现了一套模具成形多种零件的可能,节省大量的费用和时间。本文提出了多点拉弯成形的构想,比较了多点模具和实体模具成形铝合金型材的成形效果,结果表明,多点模具可以用于型材的拉弯成形;并分析了多点拉弯成形过程中产生压痕缺陷的原因,提出通过弹性垫技术消除压痕的方法;对比了多点拉弯件的轮廓曲线和目标轮廓曲线,验证了多点拉弯成形技术的成形精度。

Numerical simulation of multi-point bend-stretch forming process of aluminum profiled material

The core of multi-point forming (MPF) is that the traditional solid stretch die is replaced by discrete multi-point die. This technology realizes the flexible fabrication. The solid die can be replaced by multi-point die in the bendstretch forming process of aluminum profiled material and these can save the cost and timme of die fabrication for products. The idea of the multi-point bend-stretch forming was put forward. By comparing the forming results of solid die and the forming results of multi-point die, it shows that multi-point technology can be applied in the forming of aluminum profiled material. The impresses can appear in the process of multi-point bend-stretch, which can be suppressed by using the elastic-cushion. The shaping accuracy was validated by comparing the target of curve with the outline curve on the formed parts.