Study on High Efficient and High Precision Mirror Finishing of Fine Ceramics by Magnetic Abrasive Machining Process

研究结果表明：(1)研制出了一种新型金刚石磁性磨料，分别用于电镀和化学镀的精细陶瓷表面加工。(2)对这些新型磁性磨料进行了平面精加工性能测试。(3)化学镀工艺制备的金刚石磁性磨料与电镀工艺制备的金刚石磁性磨料在抛光性能上处于同一等级。(4)通过实验考察了金刚石粒度、铁粒度和形状、精加工道次对毛坯去除率和表面粗糙度的影响，并探讨了精加工机理。(5)采用化学粘接法制备了一种新型金刚石磁性磨料，并对其精加工性能进行了测试。(6)将小尺寸金刚石磁性磨料与铁颗粒等大尺寸铁磁性颗粒混合使用，形成新型高效磁性磨料精加工。(7)指出铁颗粒直径和铁颗粒掺混质量百分比对加工效率都有较大影响，且掺混质量百分比存在适宜值。(8)从理论上对该精加工机理进行了探讨，阐明了在精加工压力和磁刷刚度的共同作用下，加工效率得到了显著提高。(9)采用Cr_2O_3-Fe简单混合型磁性磨料对Si_3N_4精细陶瓷板进行平面精加工，采用SiO_2-Fe简单混合型磁性磨料对Al_2O_3精细陶瓷板进行平面精加工。（10）目前正在与美国俄克拉荷马州立大学R. Komanduri教授合作，研究磁场辅助陶瓷球、陶瓷辊精加工新工艺。

The results obtained in this investigation are as follows: (1) Diamond magnetic abrasives are newly made to finish fine ceramics by electroplating process and electroless plating process respectively. (2) The finishing performances of these new magnetic abrasives are examined for plane finishing. (3) The diamond magnetic abrasives made by electroless plating process was same grade in the finishing performance compared with the ones made by electroplating process. (4) The effects of diamond particle size, iron particle size and shape, finishing pass number on stock removal and surface roughness are examined experimentally, and the finishing mechanism is discussed. (5) A new diamond magnetic abrasives was made by chemical adhesion process and its finishing performance was also examined. (6) New efficient magnetic abrasive finishing is created in which the new type magnetic abrasives are used mixing small sized diamond magnetic abrasives with such large sized ferromagnetic particles as iron particles. (7) It was pointed out that the machining efficiency was influenced severely by both the iron particle diameter and the mixing weight percentage of iron particles, and there was suitable value for the mixing weight percentage. (8) Discussing this finishing mechanism theoretically, it was clarified that the machining efficiency were improved remarkably based on the increasing effects of both the finishing pressure and the magnetic brush rigidity. (9) Using Cr_2O_3-Fe simply mixing type magnetic abrasives in the plane finishing, Si_3N_4 fine ceramic plate was able to be finished, and using SiO_2-Fe simply mixing type magnetic abrasives, Al_2O_3 fine ceramic plate was also finished. (10) At present, the author is studing on the new magnetic field assisted finishing processes of ceramic balls and rollers in co-operation with Prof. R. Komanduri, Oklahoma State University in USA.