本文阐述了一种采用优化技术放大机械零部件某些难于达到的加工公差,从而实现改善加工性能的计算机辅助设计方法——“公差放大优化设计法”,并运用它对弹道相机的竖轴系(复测轴系)进行了公差放大优化设计的实例运算,给出了一个可用的公差放大值及一组优化结构参数,简要的介绍了所编制的借以完成这种设计运算的一个通用程序ORTA。说明这种方法的应用是切实可行的。 In this paper, a method of computer-aided design (OPA), which is to enlarge some difficult machining tolerances of mechanical parts by using optimization technique, is introduced to improve the machining performance. (Retest shaft system) to carry out an example calculation of tolerance magnification optimization design, gives an available tolerance magnification value and a set of optimized structure parameters, a brief introduction to the preparation of a common program to complete this design operation ORTA . Explain the application of this method is feasible.