超声磁力研磨加工参数对蓝宝石表面粗糙度的影响  

Influence of Ultrasonic Polishing and Magnetic Abrasive Finishing Processing Parameters on Surface Roughness of Sapphire

作　　者：耿其东[1,2] 李春燕 GENG Qi-dong;LI Chun-yan(School of Mechanical Engineering,Yancheng Institute of Technology,Yancheng 224051,China;Institute of Wuxi,Nanjing University of Aeronautics and Astronautics,Wuxi 214187,China)

机构地区：[1]盐城工学院机械优集学院,江苏盐城224051 [2]南京航空航天大学无锡研究院,江苏无锡214187

出　　处：《表面技术》2018年第7期104-111,共8页Surface Technology

基　　金：江苏省产学研前瞻性联合研究项目(BY2016065-57)~~

摘　　要：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R_p、R_v、R_z、R_a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?时,得到了蓝宝石加工表面粗糙度值分别为:R_p=1.992μm,R_v=1.313μm,R_z=3.305μm,R_a=0.055μm。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 1.992,1.313,3.305,0.055μm,respectively provided that rotating magnetic field rotation speed was 1200 r/min,magnetic abrasive mesh was 120 and impedance threshold was 330Ω.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.

关 键 词：超声研磨 磁力研磨 旋转磁场 阻抗控制 蓝宝石 表面粗糙度 

分 类 号：TG356.28[金属学及工艺—金属压力加工]