汽车桥壳管坯推压缩径工艺研究

基于动力显式有限元软件，以汽车桥壳管坯为例，分别开展了1道次和2道次推压缩径成形工艺的数值模拟，并对缩径区典型截面的壁厚分布、端部翘曲、轴向失稳等影响成形质量的因素进行了分析。模拟结果表明：采用2道次的缩径成形工艺明显要优于1道次直接成形。成形件不仅满足使用要求，而且缩径过程中模具最大载荷为360kN，对模具的损耗尽可能地降低到最小程度，有利于降低生产成本，并对随后成形出合格的桥壳胀形件奠定了基础。

A Technical Study on the Multi-step Extruded Sinking Process of Automobile Axle Housing Tube

Taking an automobile axle housing tube as a typical example, one pass and two-pass numerical simulation of extruded sinking were carried out, and the effect factors of typical section thickness distribution, end warp, axial instability were analyzed. Simulation results show that, the technique of two-pass extruded sinking is better than that of one pass forming. Forming part not only meets use requirement, but also the maximum load of mould is 360 kN, and the wasting of mould is reduced as low as possible. It is good for reducing the production cost. And it lays foundation for the subsequent bulging of automobile axle housing.