采用大变形弹塑性有限元理论， 对角铝型材挤压过程进行了数值模拟。 分析了型材挤压过程中各阶段的网格畸变情况， 给出了挤压变形时的流速、 应变和应力分布， 揭示了造成异型型材挤压时出现扭拧、 波浪和弯曲等缺陷的重要原因是变形体内存在一个涡流场。 模拟结果为正确地设计型材挤压模具和工艺参数的选择提供了可靠依据。
An angle aluminum profile extrusion processes was done by numerical simulation with large deformation elastoplastic finite element theory, and the mesh distortion of different stages of profile extrusion processes were described in detail, the distributions of stress and strain field were also obtained. It is pointed out that the cross cracking, bending, distorting and twisting on the asymmetry extruded profile are caused by a vortex flow field in the deforming body of extrusion processes. The simulating results can be applied to design of dies and the selection of technological parameters for the aluminum profile extrusion processes.
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