采用三次样条函数插值和Bezier曲线拟合两种方法来完成挤压模具型腔轮廓形状的优化设计 ,以挤压表面载荷沿凹模型腔轮廓表面均匀分布来提高模具寿命为优化目标 ,运用刚塑性有限元分析和修正的序列二次规划算法相结合的方法 ,获得了各自优化了的凹模型腔轮廓曲线。通过有限元软件验证了优化结果的有效性和可行性。将这些方法应用于气门及其他类似零件的生产 ,证明了优化的凹模型腔轮廓曲线对提高模具使用寿命有显著效果 The cubic spline function interpolation and Bezier curve fitting are used to optimize the profile shape of the extrusion die cavity. With the extrusion surface load evenly distributed along the profile surface of the die cavity to improve the die life, Plastic finite element analysis and modified sequence quadratic programming algorithm were combined to obtain the respective optimized cavity profile curve. The validity and feasibility of the optimization results are verified by finite element software. The application of these methods to the production of valves and other similar parts proves that the optimized profile of concave cavity has a significant effect on improving the service life of the mold