中文摘要：

目前多数五轴数控机床仿真系统，一般只提供二维的动画仿真，而且仿真系统的几何造型功能十分有限，零件和机床模型需要在其他CAD软件中进行建模，然后导人数控仿真系统。由于文件格式的转化，零件的CAD模型将会产生误差，降低了仿真精度。该文利用UGCAD／CAM软件造型功能建立五轴数控机床和零件模型，读取数控代码对机床各部件进行三维运动仿真，并对加工过程中机床运动部件之间的干涉及工件过切进行检查，建立干涉实体，为刀具轨迹的修改提供依据，同时免除了文件格式的转化产生的误差。

英文摘要：

Today most machine simulation systems virtually are based on the extended z - buffer algorithm which basically only provides 2D image. And the interaction of those simulation systems with CAD software is also limited. The accuracy will be reduced during the data exchange. The increased and improved availability of CAD/CAM software provides excellent surface modeling ability, makes it possible to simulate the whole process of machining. A machine simulation system for 5 - axis milling is presented in this paper to detect machine collisions. The information of machine tool and workpiece is used for UG CAD/CAM software to construct the machine and workpiece models, while the NC program is used as input data to perform the machine motion. During the simulation, overcut and collisions between the moving machine components can be checked. And the error of data exchange can be avoided.