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采用三维刚粘塑性有限元方法，对一典型的铝型材非等温成形过程进行了数值模拟。分析了铝材挤压的３个不同成形阶段，给出了成形各阶段的应力、应变和温度场分布情况以及整个成形过程中模具载荷随成形时间的变化情况。这些模拟结果为铝型材挤压的模具设计和设备选取提供了重要的依据。同时，还对三维塑性变形的有限元数值模拟中关键技术的处理方法进行了探讨
A three-dimensional rigid-viscoplastic finite element method was used to simulate the non-isothermal forming process of a typical aluminum profile. The three different forming stages of aluminum extrusion were analyzed. The distribution of stress, strain and temperature field and the change of mold load with the forming time during the forming process were given. These simulation results provide an important basis for die design and equipment selection of aluminum extrusion. At the same time, the key techniques in the three-dimensional plastic deformation numerical simulation are also discussed