拉弯模具间隙对复杂截面型材成形精度的影响

采用有限元数值模拟方法对非对称复杂截面铝合金型材拉弯工艺过程进行研究,分析拉弯模具间隙对称和不对称两种情况对型材拉弯后的截面畸变及回弹的影响.结果表明型材拉弯后壁厚出现减薄,其最小厚度受间隙值影响较小,但左右间隙是否对称会影响截面畸变方向,左右间隙不对称时型材拉弯后其截面畸变方向会发生偏转,回弹后的扭转量也会有变化.以减小截面畸变和回弹量从而提高成形精度为目标,通过数值模拟分析对拉弯模具左右间隙值进行了优化,为合理设计拉弯成形模具提供理论依据,对制定生产工艺规范具有重要参考价值.

Stretch bending die clearance influence on forming accuracy to complex section profile

The finite element analysis(FEA) method was adopted to simulate the stretch-bending process for complex asymmetric section aluminum alloy profile, and the effect on distortion and the influence of spring back due to die clearance of symmetry and asymmetry was studied. The results show that thickness change to thinner after bending, and the minimum thickness is with little effect from clearance, but the asymmetric will result the change of distortion direction, it will also change after spring back. To improve the forming accuracy by reducing the distortion and spring back, a numerical simulation analysis method was adopted to optimize the right and left clearance on the die. It also provides theoretical evidence for stretch-wrap bending die design.