关键词: 并联六坐标测量机, 虚拟样机, 几何建模, 运动建模

Abstract: The parallel mechanism CMM (coordinate measuring machine), as a new type of CMM, simulates the motion form of multiped. Because of its complicated motion, it is difficult to judge the position and stance of probe intuitionisticly and exactly only by calculational data. It is obligatory to simulate the operation process of parallel mechanism CMM by virtual prototype. In the paper the OpenGL functions are transferred by VC++ under the windows 2000 so that the various parts of CMM are entity-sculpted, and entity-assembled according to the constructional relation between parts. So the 3D simulative figure of CMM is obtained. Moreover, combining with the kinematics obverse solution model and reverse solution model of position analysis, the virtual prototype of six-freedom-degree parallel mechanism CMM is developed, which can motion in real time and realize simulative operation in high efficiency and low cost. It is proved by test that this system runs reliably, has realistic effect and provides means for manufacturing actual prototype.

Key words: six-freedom-degree parallel mechanism CMM, virtual prototype, geometry modeling