The quality of surface machining of glass-ceramic materials determines the performance of optical components. Low surface roughness and surface/subsurface damage in precision grinding is one of the machining conditions for the ultra-smooth surface of glass-ceramic materials. In this paper, the bowl-shaped diamond grinding wheels with different particle size and binding agent were used. First of all, the orthogonal tests of machining parameters such as different feed rates, spindle speed, and grinding depth at high speeds were designed. Secondly, the surface machining quality and stress distribution after grinding was analyzed. At last, the reasonable machining parameters for high-speed grinding of glass-ceramic materials were explored, in order to provide reference and basis for actual machining.
Different from the abrasive grinding process, diamond particles are solidified in matrix materials and the fixed motion between abrasives and workpieces which good for precision machining, so we take this method to grind glass-ceramic reflector and a good surface quality was obtained by using diamond W14 pellets. Through the grinding process experiment, the material removal rate on the glass-ceramic reflector are measured at the given rotation speed, the pendulum frequency and pressure by W28, W14, W5 pellets. In addition, the surface roughness measurement results show that the surface roughness of 181.6nm can be obtained by using W28 diamond pellets. The experiment also demonstrates that the surface roughness of the glass-ceramic reflector is decrease with changing pellets in a smaller diamond size. After ultra fine grinding processing by using W5 diamond pellets, finally, the optical surface with a roughness of 20.8nm is obtained. The experimental results show that the method of using diamond pellets to process glass-ceramic reflector can replace the traditional abrasive finishing process in rough grinding, fine grinding and superfine grinding.
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