Glass ceramic is a kind of important material, which has been widely used in modern optics industry. Magnetorheological Finishing (MRF) is a newly developed technology, which eliminates subsurface damage, reduces micro roughness, and corrects surface errors. In the present study, glass ceramic was polished using Magnetorheological Finishing (MRF). The finished surface was tested with an AFM. The result shows that the workpiece has good surface quality. The flexibility of MRF makes it effective for ultra-precision machining of glass ceramic.
Magnetorheological finishing (MRF) is a novel optical machining technology. The mechanism of MRF is introduced, the polishing experiment of optical glass of MRF is conducted through changing the polishing parameters such as magnetic field intensity, content of polishing abrasive and rotation speed of polishing wheel. Through proper controlling of the finishing parameters, the polished surface roughness of optical glass is Ra 1.132 nm measured by an AFM.
More and more ceramic parts are used to substitute for metal counterpart due to their excellent physical, chemical and mechanical properties. However, ceramics, especially structural ceramics, are extremely difficult to machine because of their high hardness and brittleness. Some parts of large batch production have large machining allowances and the machining efficiency is very low with conventional grinding method. So it is of great importance to research the high efficiency grinding technology of hard and brittle material. In recent years, grinding techniques for precision machining of brittle materials have been improved by using super abrasive wheels and precision grinding machines. A new method of electrolytic in-process dressing (ELID) grinding developed by Dr. Hitoshi Ohmori has been adopted for the ultra precision machining of hard and brittle materials. It has been widely used in fine abrasive grinding for its in-process dressing. In this paper, the cast iron bond diamond wheel and ELID grinding technology are used on a surface grinder to research the high efficiency grinding technique. Alumina ceramics have been machined both by the cast iron bond diamond wheel with ELID grinding and by the resin bond diamond wheel. The grinding process adopts plunge grinding and a Kistler Dynamometer is used to measure the grinding force. It has been found that the grinding force of ELID grinding is apparently smaller than the grinding force of the resin bond wheel. Under the same machining conditions, it is about 2/5-3/5 of the force for using the resin bond wheel. The result indicates that the grinding efficiency can be highly improved by applying ELID grinding technology. In addition, the in-process dressing can keep the grinding wheel sharp. This property is also of benefit to the continuous high efficient grinding of hard and brittle materials.
Currently, most of the diamond turning tools used for precision machining are still manually manufactured, the profile accuracy of the diamond cutting edge depends on the operator’s experience and skill, so that the process need to be automated. Therefore in this research, an automated grinding system has been developed for the diamond turning tools, controlled by a vision system. The profile of the diamond turning tools is captured in real time via CCD camera. The deviation from an ideal circle is calculated and feedback to the controller, the grinding system then removes cutting edge of turning tool selectively to achieve high quality and high productivity.
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