This paper constructs a streamline die cavity based on NURBS and simulates the extrusion process of spur gear in an application, in which large deformation rigid-plastic FEM is adopted.

• 基于NURBS曲面构造流线型凹模型腔，用大变形刚塑性有限元数值模拟软件对圆柱直齿轮挤压过程进行了模拟。