| With the rapid development of modern optics, the application of the aspheric optical facilities become more and more abroad. So it is exigent to develop a new ultra-precision process method which is suitable for hard-brittle material in aspheric process. Magnetorheological finishing (MRF) is a new developed optical machining method which can fine finish optical apparatus efficiently. Plane surface, sphere and asphere of different materials can be machined. But ultrasonic-magnetorheological compound finishing (UMC finishing) is a new polishing way based on MRF which integrate electromagnetic.hydrodynamic and chemistry in optical facilities process in optical facilities process. It can polish the aspheric optical facilites efficiently. The main aspect of researching is as follows:Firstly, the device of UMC finishing is developed. It adds utrasonic on the base of MRF device. The ultrasonic part includes ultrasonic occur device and ultrasonic libration system.Secondly, the material removal characteristics. is studied in UMC finishing, removal process of traditional material polishing is analysed, three kinds of polishing theories:mechanical microcutting theory,chemically theory and rheology theory are introduced. Then Preston's equation is applied in the process of polishing, expatiated forced workpiece three powers in the process of UMC finishing, at last, through doing experiment, gaining the relation of max cutting quantity and time.Lastly, several kinds of main processing parameter study is finished.contrapose developed UMC finishing equipment. The influence to removal efficiency by magnetic field intensity.ultrasonic amplitude and the gap between glass part and polishing tool is researched by polishing experiment.
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