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.
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.
This paper studied a manufacturing processing of optical surface with high precision in angel and surface. By theoretical analysis of the relationships between the angel precision and surface, the measurement conversion of the technical indicators, optical-cement method application, the optical-cement tooling design, the experiment has been finished successfully, the processing method has been verified, which can be also used in the manufacturing of the optical surface with similar high precision in angle and surface.
In the process of machining, the glass ceramic is easy to crack and damage, etc. And the residual stress in the machined surface may cause the crack to different extent in the later stage. Some may even affect the performance of the product. The residual stress of rotary ultrasonic drilling and mechanical processing is compared in different machining parameters (spindle speed, feed rate). The effects of processing parameters and methods are researched, in order to reduce the residual stress in the mechanical processing of glass ceramic, and provide guidance for the actual processing.
The optical glass is hard, brittle and difficult to process. Based on the method of rotating ultrasonic drilling, the study of single factor on drilling elongated holes was made in optical glass. The processing equipment was DAMA ultrasonic machine, and the machining tools were electroplated with diamond. Through the detection and analysis on the processing quality and surface roughness, the process parameters (the spindle speed, amplitude, feed rate) of rotary ultrasonic drilling were researched, and the influence of processing parameters on surface roughness was obtained, which will provide reference and basis for the actual processing.
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