为了提高模具CAD系统的效率和设计质量,应尽可能地采用优化方法进行自动化设计。本文根据优化方法和专家系统的思想,提出了搜索可行网格和判别推板形状的算法。在此基础上对复合冲裁模主要工作部件——推件装置的工艺方案和推板形状进行了自动化设计,并把它们加入到模具CAD系统里。该方法还可推广到使用推件装置的其它机构中。 In order to improve the mold CAD system efficiency and design quality, optimization methods should be used as far as possible to automate the design. According to the optimization method and the idea of ​​expert system, this paper proposes an algorithm to search for feasible grids and determine the shape of push-plate. On this basis, the main working parts of the composite blanking die - pushing device technology programs and push plate shape were automated design, and add them to the mold CAD system. The method can also be extended to other mechanisms that use a pusher device.