通过对带直角边缘凸台零件进行工艺性分析，提出了挤压工艺与镦挤工艺相结 合的工艺方法． 采用刚塑性有限元分析方法，运用 Deform-3D 有限元分析软件，对带直角 边缘凸台挤压及镦挤过程分别进行了数值模拟． 模拟结果表明: 采用挤镦复合工艺能够获 得带直角边缘的凸台; 在挤压凸台过程中，反顶杆凸起高度越大，凸台边缘圆角越小，越有 利于带直角边缘凸台的成形; 反顶杆凸起高度越小，凸台孔壁与端面越容易出现破裂等缺 陷． 根据数值模拟结果设计并制造了一套挤镦凸台试验模具，对挤镦凸台过程进行了试验 验证． 结果表明，试验结果与数值模拟结果基本一致; 增大凸模圆角半径和使用润滑油能 有效地减少裂纹的产生．

In the investigation，a combined process of extrusion and upsetting extrusion is proposed by analyzing the forming technologies of the parts with rectangular edge convexity． Then，the extrusion and upsetting extrusion processes of the rectangular edge convexity are respectively simulated by using the finite element analysis software Deform-3D and by means of the rigid-plastic finite element analysis method． Simulation results show that the proposed combined process can achieve the convexity with rectangular edges，and that，during the extrusion process， the larger boss height of the anti-push punch is，the smaller the convexity edge fillet will be，which is more beneficial to form the rectangular edge convexity． It is also found that smaller boss height of the anti-push punch causes the crack defects to occur more easily on the hole wall and the end face of the convexity． According to the simulation results，a set of stamping dies are designed and manufactured，so as to verify the forming process of the convexity by experiments． The results show that the experimental results accord well with the simulation ones，and that the crack defects can be effectively reduced by increasing the punch fillet radius and by adopting the lubricating oil．