目的 提高蓝宝石研磨后的表面质量。方法 采用超声研磨与磁力研磨相结合的工艺方法，对蓝宝石进行研磨加工。超声研磨采用恒流超声电源及等效阻抗控制进给方式，通过改变不同阻抗阈值获得不同的加工表面。磁力研磨采用永磁体及磁场旋转的运动方式，通过调节转速、更换磨粒大小获得不同的加工表面。以旋转磁场速度、磁性磨粒大小、阻抗阈值作为主要工艺参数，以表面粗糙度值Rp、Rv、Rz、Ra为评价指标，设计相应的工艺试验。结果 采用超声磁力研磨加工方法，当旋转磁场转速为1200 r/min、磁性磨粒目数为120目、阻抗阈值为330 Ω时，得到了蓝宝石加工表面粗糙度值分别为：Rp=1.992 μm，Rv=1.313 μm，Rz=3.305 μm，Ra=0.055 μm。结论 采用超声磁力研磨工艺加工蓝宝石时，在旋转磁场转速及阻抗阈值一定的情况下，磁性磨粒大小对表面粗糙度值的影响较显著；在磁性磨粒大小一致的情况下，旋转磁场转速及阻抗阈值主要对表面粗糙度值Rp及Rv的影响较大。

The work aims to improve surface quality of sapphire after being ground. The process method of ultrasonic polishing was combined with magnetic abrasive finishing, surface roughness values Rp, Rv, Rz and Ra were taken as evaluation indexes. Ultrasonic polishing is a kind of non-contact precision grinding method, and magnetic abrasive finishing also belongs to flexible manufacturing mode, which are combined in order to improve machining efficiency and surface quality. For ultrasonic polishing, constant current ultrasonic power and equivalent impedance control feed mode were applied, and corresponding processing surface was obtained by changing different impedance threshold. For magnetic abrasive finishing, rotating magnetic abrasive finishing with permanent magnets was applied, and effects on machining surface were observed by adjusting rotational speed and replacing grinding particle size. Technological test was designed with revolving magnetic speed, impedance threshold, and magnetic abrasive size as three main technical parameters including. Based upon ultrasonic polishing and magnetic abrasive finishing, surface roughness(Rp, Rv, Rz, Ra) of sapphire finished surface was 1.992, 1.313, 3.305, 0.055 μｍ, respectively provided that rotating magnetic field rotation speed was 1200 r/min, magnetic abrasive mesh was 120 and impedance threshold was 330 Ω. Magnetic abrasive size has obvious effects on the surface roughness value when using ultrasonic polishing and magnetic abrasive finishing for sapphire and speed of rotating magnetic field and impedance threshold value are constant; the speed of rotating magnetic field and impedance threshold mainly have greater influence on surface roughness of Rp and Rv if magnetic abrasive size is consistent.