【摘要】 提出了面向三维CAD的公差建模系统TolRM的设计思想、系统结构、核心功能等.通过设计层次式的公差表示与基于类的公差类型定义,实现了公差与三维CAD系统的有机集成;研究了保证公差合理、完整、有效的评价方法.讨论了公差工程语义的解释方法,并给出了基于变动体的公差效果体现方法.为提高系统效率,分析了公差域的各种情况并对其进行预处理.经过较多的测试表明,TolRM具有较好的鲁棒性、实用性和先进性.更多还原

【Abstract】 The design principle,system architecture and key functions of TolRM system are presented.To facilitate the seamless integration of tolerance with CAD systems,a hierarchical structure for tolerance representation is devised.The rule-based methods for evaluating correctness of tolerance ensure that the given tolerance specifications are reasonable,complete and effective.The interpretation method of tolerance semantics is discussed.Variational volumes are used to explicitly illustrate the effect of tolerance.Some techniques are also given to improve the system efficiency.Tested by many samples,TolRM shows good robustness and practicability.更多还原