摘要
目前三维 CAD系统中的几何公差信息只是一种文本符号 ,缺乏工程语义 ,如何对其作出合理的解释对于 CAD/CAM集成有着十分重要的意义。给出了基于语义的几何公差分类方法及基于自由度变动的基本几何要素数学表示方法 ;基于公差的数学定义 ,系统地推导了各种类型公差的三维语义表示方法 ,准确完整地表示出了其语义 ;
Tolerance information is very important for CAD/CAM which is just a text attribute in present 3D CAD system and has little semantics. Such information can not be used for subsequent CAPP, CAM, etc. In this study, a new classification method of tolerances according to semantics and mathematical representation of basic geometric elements based on DOF is given. The representation of tolerance semantics is systematically deduced based on its mathematical definition that can characterize the semantics exactly and expressively. Thus, tolerance information in CAD system can be explained and used. An example is given to illustrate how to use the mathematical model in geometric modeling with tolerance information.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2003年第3期241-245,共5页
China Mechanical Engineering
基金
国家自然科学基金资助项目 (69973 0 45 )
国家创新研究群体科学基金资助项目 (60 0 2 12 0 )
关键词
公差
数学定义
公差语义
CAD
CAM
tolerance mathematical definition tolerance semantics CAD/CAM
