计算机辅助装配公差分析的探讨

Study on computer aided assembly tolerance analysis

探讨了将公差分析纳入到设计过程中,并对设计过程中公差取值进行指导的可行性,在用Pro/E在计算机上进行产品预装配的过程中利用公差分析中的最坏情况分析法、统计分析法、敏感分析法、百分比贡献分析法以及Pro/E软件中的CE/TOL(公差分析)模块对所设计的零件和零件装配的全过程进行公差分析与综合,确定零件的公差在装配过程中影响关键尺寸公差的约束及其敏感度,通过改变个别零件的关键尺寸的公差约束来降低制造成本,减少发生干涉和精度超标的概率,提高装配精度。

Tolerance analysis and the feasibility of instructing the tolerance value in the course of design were discussed.When using Pro/E to assemble the products in the computer,the tolerance of the designed parts and the whole parts assembly process was analyzed and synthesized,by using the worst situation analytical method,statistic analytical method,sensitivity analytical method,percentage contribution analytical method and CE/TOL module.Thus,the restriction and its sensitivity on the key dimension by the tolerance of the certain parts in assembly process were confirmed,through changing tolerance restriction of one or two parts′s key dimension,the produce costs can be depressed,the probability of interference and precision superscale can be reduced,the assembly precision can be improved.