CAD/CAM System For Spacial Cam In 5-aixs NC Machining

Spacial cam mechanisms are found in almost all mechanical devices and machines (i.e., agriculture, transportation equipment, textiles, packageing). With the development of NC technology, most of the machining of the spacial cam is finished by a NC machining, but the NC machine tool factories are not provide the professional software package for spacial cam manufacture. Consequently, many spacial cam factories have to use universal CAD/CAM software packages (i.e., UG, Pro/E) as design and manufacture programming platform. Because of it is lack of pertinence to use universal software for spacial cam manufacture programming, it is still laborious.Considering the requirement of cylindral cam machining, this thesis studies the key issues of the transmission principle, gearing principle and NC machining of the cylinderal cam mechanism with the aid of differential geometry and space curve gearing theory. The basic kinematic formula of the cylinderal cam mechanism is deduced, and the analytical form of the cam profile surface is computed by given the geometrical property and the motion law of the follower. Furthermore, parameters of the profile surface, i.e. the principle direction and principle curvature are computed. The 3D model is built by dint of the graphic technology of OpenGL, and the movement simulation is achieved by using the double buffer technology. Based on these, "CAD/CAM System for spacial cam in 5-aixs NC Machining" is developed.The cutter locations are computed by the second order osculating machining method according to the transmission principle and machining parameter. The tool path is inspected by the geometry simulation. At last, the NC code is generated by post processing for specified machine tool, and the CAD/CAM intergration of spacial cam is achieved.According to the requirements of module designing, the system structure is presented and the main functional modules are implemented. By using this system, the surface model of spacial cam, the movement simulation, machining simulation and tool-path generation can be realized accurately, conveniently and quickly. The system turned out to be extensible and applicable, convenient and automatic. Therefore, research achievments with theoretical significance and practical value are acquired.