Research And Development Of Two-dimensional And Three-dimensional Cam Cad / Cam System

Cam mechanism can transfer the revolvement of cam to the motion of follower by rule, so it has been be very widely applied in various machinary. With numerical control manufacture is widely applied in our country, it is necessary to realize CAD/CAM of cam. But all designed software before in our country still have some weakness, for example, the conventional type of cam counld be projected by these software is very little, and used approximation by lines to curves of cam which have bigger error and more nodal points that result in chattering of principal axis. In furthermore, this software of designing cam in fact only has the function of CAD. If you want to simulate and work over the designed cam in that software, you will find that you have to export it to other CAD/CAM system software (e. g MasterCAM). So these designed software are not satisfactoty for us? In this situation, the 'Cam CAD/CAM System' has been designed software after studied present technique state of designed software for cam in our country and correlation techniques of CAD/CAM.The software can design many conventional type of cam, concluding cam-plate with middle follower, cam-plate with offset follower, cylindrical cam, dividing cylindrical cam, and cylindrical cam with space curve, etc. In forming working curves of cam-plate, used the approximation by arcs which can lessen the nodal points on curves of cam uttermostly in same error, so it reduce the computation time and relieve the chattering of principal axis.In former times, to cam mechanism, the follower only has onedirection motion. If you want it have 2D motion, then you have to fit it by two-cams mechanism, so it not only occupy bigger space, but also lower the motion accuracy. So the writer designed the cylindrical cam with carrier in 2D motion.The most special feature of the cam-designed software is fulfill the CAD/CAM intergration, that is after you designed a cam by the software, you can change it into NC code directly, and can simulation it in this software by calling AutoCAD, or machining it by transfer NC code to numerical control machine. In addition, it had founded the database and universal post processing in the software for facilitating user to operate.The cam-designed CAD/CAM system software can design conventional types of cam, own the advanced curves approximation and complete function, so it should has great practical and theoretical value.