(1. 太原重型机械学院压力加工系，太原 030024;
2. 哈尔滨工业大学材料科学与工程学院，哈尔滨 150001)
摘 要: 采用刚塑性有限元法对径向筋条的成形过程进行了模拟，结果表明，锻造时，金属首先充填轴套部分，轴套部分基本充满后才开始充填筋部，且筋条的充填顺序为由里到外，外侧顶部为最后充填处。在变形终了阶段，腹板与轴套交界处出现剧烈的剪切流动，有可能造成组织缺陷。根据模拟结果，锻造时采取了特殊措施，成功地锻制出上机匣锻件，锻件的力学性能、显微组织和尺寸精度均符合要求。
关键字: 塑性成形；有限元法；数值模拟
（1. Department of Metal Forming, Taiyuan Heavy Machinery Institute, Taiyuan 030024, P.R.China
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China）
Abstract:The forming process of radial rib of upper case is simulated by the rigid plastic finite element method. It can be seen that, in the forming process, the metal fulfill the axial ring first, then fulfill the rib. The sequence of metal fulfillment is from the inner to the outer and the upper portion of the outer is fulfilled lastly. In the final stage of forming, the severe shear flow presents at the joint portion of web and axial ring which is of the possibility for generating the defects of microstructure. According to the simulating result, some special means are adopted and the forging of upper case is conducted successfully. Both the mechanical properties, microstructure and the accuracy of forging satisfy the requirements of the user.
Key words: plastic forming；finite element method；numerical simulation
