摘要
本文结合国家自然科学基金项目“综合公差计算机辅助设计系统研究”
(59705022)和“基于产品几何技术规范的集成公差设计理论与方法”
(50275136)，研究了计算机辅助形位公差类型的生成技术，开发了计算机辅助
形位公差类型生成的原型系统，论文的主要研究内容如下：
第一章：在分析计算机辅助形位公差设计研究现状的基础上，提出了本论文
研究的主要内容和结构安排。
第二章：基于产品几何技术规范中的特征概念，根据TTRS理论将特征划分
为7类对称特征；定义了三类变动几何约束：自参考、互参考和配合变动几何约
束；划分了7类自参考变动几何约束、27类基本互参考变动几何约束和6类低
副配合变动几何约束。
第三章：基于图论实现了变动几何约束网络的表示，并提出了完全约束的变
动几何约束网络的判断准则；在此准则的基础上，研究了完全约束的变动几何约
束网络的生成方法，最后基于MDT实现了完全约束的变动几何约束网络的构建。
第四章：将公差划分为自参考和互参考公差两类，分析了自参考和互参考变
动几何约束与相应的公差类型之间的对应关系；给出了公差类型的推理方法，研
究基于变动几何约束网络的形位公差类型的生成策略。
第五章：开发了集成于MDT三维系统内的形位公差类型生成的原型系统，
并用实例验证了原型系统的有效性。
第六章：对全文进行总结，对计算机辅助形位公差的设计应该进一步开展的
工作进行探讨和展望。
Based on the "Study on Computer Aided Tolerancing System" and "Design Theory of Integration Tolerance Based on Geometrical Product Specifications" (National Nature Science Fund Project, No: 59705022, 50275136), the technology of computer-aided geometric tolerance types generation is presented. The prototype system for computer-aided geometric tolerance types is developed.
In the first chapter, the development and State-of-the-arts of computer aided tolerancing system at home and abroad are summarized. The key techniques of computer-aided geometric tolerance are analyzed. At last, Main contents and general structure scheme of this dissertation are present.
In the second chapter, based on new feature defined by ISO/TC213 and TTRS theories, seven symmetrical features are classified and analyzed. Variational geometric constraints (VGC) are classified as self-referenced VGC, cross-referenced VGC and mating VGC. Seven kinds of self-referenced VGC, twenty-seven kinds of basic cross-referenced VGC and six kinds mating VGC are classified.
In the third chapter, based on the theories of graph theory, mate tree and loop circuit are proposed. Evaluation rules of well-constrained VGCN are studied. Then, the flow charts of VGCN generation and evaluation are given. At last, based on MDT, the VGCN is established.
In the fourth chapter, according to the GB/T 1182-1996, tolerances are classified into self-referenced tolerance and cross-referenced tolerance. The corresponding relationship between self-referenced & cross-referenced VGC and self-referenced & cross-referenced tolerance are studied. The method and process of well-referenced tolerance types are discussed.
In the fifth chapter, the prototype system for geometric tolerance types generation is built on MDT. The system comprises three modules. The example is studied to demonstrate that the system can effectively work.
In the sixth chapter, all of the work in this dissertation is summed up. The future research of computer-aided tolerancing is prospected.
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