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精度信息是集成化ＣＡＤ／ＣＡＭ系统的产品模型中必不可少的．本文研究了在ＣＳＧ／Ｂｒｅｐ混合表达的特征建模环境中零件的精度模型，通过引用几何链表将精度模型与特征和几何模型集成起来，在实现关联、继承和提取机制的基础上提供了在不同层次求值窗口的公差信息建模界面。
Accuracy information is integral to the product model of an integrated CAD / CAM system. In this paper, we study the accuracy model of parts in the feature modeling environment with CSG / Brep mixed expression. By integrating the precision model with the feature and geometric model by referring to the geometric linked list, Tolerance Information Modeling Interface for Hierarchy Evaluation Window.