Study And Application On The Techniques Of High-Efficiency Magnetorheological Finishing

With the laser fusion, aviation, aerospace, space exploration, military reconnaissance and other high-tech developments in the field, requirements of people on the surface of precision optical components increasing. In conventional optical glass machining, grinding and polishing are most commonly used method of manufacturing smooth mirror. However, there are issues that the traditional low efficiency polishing technology, accuracy can not meet the requirements of modern optical technology.In the past few decades, MR fluids have been widely used in various engineering fields, also gradually improve its performance. Magnetorheological Finishing Technology (MRF) is made on the basis of the development of magnetic fluid, which is a new optical surface precision machining technology. With the people-depth study of ultra-precision polishing technology and the increase of the level of detection of ultra smooth. Magnetorheological finishing technology with its superior performance attracts more and more extensive attention.This article made the following aspects of the research work:1. Development of fluids for finishing. According to the mechanism and characteristics of MRF, Propose the evaluation criteria of magnetorheological fluid for K9 optical glass polishing. According to this standard, analysis the role of various components and characteristics required of fluids for finishing. Thus, the fluid composition and configuration of the process line of the MRF have been identified. And good performance fluids for finishing have been successfully developed.2. Experimental study of the material removal rate. using the liquid MRF for material removal experiment. According to orthogonal experiment and the single factor method of supplementary, the primary and secondary relationships and influence of factors on the material removal rate are obtained, which basis on quantitative controls and the improvement of MRF liquid for the material removal.3. Experimental study of surface roughness. At the same level of process parameters, using the liquid MRF for surface roughness experiment. The primary and secondary relationships and influence of factors on the surface roughness are obtained by the orthogonal experiment. Determine the performance of the best fluids for finishing models.4. Optimization of fluids for finishing. Based on the analysis of the initial application of the experiment to finishing fluids, under the guidance of the primary and secondary factors in the relationship, with the polished for the efficiency and quality of polishing, the best configuration of Magnetorheological polishing fluid is determined.5. Depth study of the Microstructure of the material removal. According to the analysis and research of the Areas designated by polishing for material removal rate, polishing unit time of the microscopic region is obtained. It can reflect the case of material removal on the glass,when MRF "grinding" in the presence of 1 minute on optical glass. The distribution in space of Material removal rate can be directly observed. Actually, the unit of time polishing morphology region can be equivalent to the shape of the polishing "grinding". That is equivalent to a form of polishing "grinding" in the workpiece surface from the scraping of their role, remove the material. So as to provide a basis matrix function for establishing the removal model of MRF, then can realize the point control and repair for surface shape of the complex surface.