Study On Mold Grinding Technique In Helical Surface NC Machining

In order to improve the machining precision and efficiency of screw compressor rotors and established a groundwork for designing and manufacturing the mold grinding machine on rotors, the paper studied mold grinding manufacture techniques of numerical control. The paper raised a new method for controlling and corresponding the process of machining and dressing, and settled a serial of crucial problems about it.The paper studied the method for calculating the profile of grinding wheel for machining rotors, settled the problems for calculating of differential coefficient on scattering points and the choice of fixing angle. It is proved to be a precise method, which is fit for mold grinding through analysis calculating errors.The problems for controlling and corresponding the process of machining and dressing are thoughtfully researched. Because of dressing data changed according to the dressing amounts in the process of dressing, it needs to update the numeric programs for dressing process and compensate the decreasing of grinding-wheel's diameter. In order to improving the flexibility of numerical control system, the communication between computer and numerical control system is instanced through RS232 serial port in direct numerical control mode combined with PLC function, which accomplish the transmission of numerical control programs. The system errors are dealed with the module of error-manage to improving the stabilization of system, and designed structure and movement on dressing device and machine tool.The paper settled a serial of problems for machining screw compressor rotors and designed a software for calculating the profile of grinding wheel, displaying of graphics, and controlling the process of machining and dressing. The paper established a groundwork on designing and manufacturing moldgrinding machine tool for machining screw compressor rotors.