通过对数字化预装配方法的分析，提出了基于数字化产品设计模型的装配公差分析和优化方法。

The assembly tolerance analysis and optimization method based on digital product design model is put forward according to the analysis of digitalization preassembly method.

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通过实际装配精度的计算和分析，提出两种方法，扩大尺寸的公差，降低了加工难度，提高经济效率。

Through calculating and analyzing the actual assembly accuracy, the paper establishes two ways to enlarge dimensional tolerance to reduce machining cost and raise economic efficiency.

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研究了蒙特卡洛法在公差优化中的应用，给出了装配成功率的计算公式以及精度灵敏性分析的方法。

Research the application of Monte Carlo method for tolerance design, display the calculate formula of estimated stack-up yield and the analysis method of sensitivity to tolerance.

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