基于ANSYS的汽车后桥焊接变形优化

Welding Deformation Optimization for Car's Rear Axle Based on ANSYS

建立了某汽车后桥的有限元模型,确定了材料热物理性能参数和热源模型,介绍了利用生死单元方法模拟焊缝金属的填充过程,并根据实际情况制定了焊接变形合格范围。采用ANSYS有限元仿真技术对后桥焊接变形进行了预测及优化,通过改变焊缝的焊接顺序及方向实现了抑制焊接变形的目的。结果表明,优化后后桥焊接变形量最小为1.3 mm,模拟计算结果与实测结果相吻合。

In this paper, a FE model of a vehicle＇s rear axle is established, material＇s thermal physical property parameter and khermal source model are defined, the simulation of the metal filling process of welding seam with dead- live unit method is introduced in the paper, the welding deformation range is established according to actual conditions. ANSYS FE simulation technique is used to predicate and optimize welding deformation of rear axle, and welding deformation is restrained by changing welding sequencing of welding seam. The results show that after optimization, the minimum welding deformation of lear axle is 1.3 mm, the simulation result is identical with measurement result.