中文摘要：

汽车悬架臂零件为异形截面构件，是汽车底盘结构件的典型代表之一。为了提高材料利用率和成形效率，悬架臂零件采用一坯两件生产方式。基于动力显示有限元软件Dynaform，对充液成形多工序工艺路线进行数值模拟，并结合正交试验，研究主要工艺参数对充液成形的影响。在此基础上进行弯曲、预成形和充液成形工艺试验。研究结果表明：多工序充液成形有限元模拟结果与试验结果基本一致。在补料压力30 MPa、补料量15 mm、摩擦因数0.06时，成形出合格零件。

英文摘要：

Trailing arm which is one of the typical automotive chassis parts is a profiled cross-section component, and it can be made with multi-cavity mould in order to improve material utilization and production efficiency. A numerical simulation investigation of multi-step hydroforming process of the part was conducted by using the dynamic explicit FEM code of Dynaform. And the influence of main process parameters was studied with orthogonal test. On the basis above, experiments of tube bending, pre-forming and hydroforming were carried out. The results show that the simulation result agrees well with the experimental one, and an ideal component can be made with the process parameters of pressure of axle feeding 30 MPa, axle feeding 15 mm and friction factor 0.06.