磁流变效应微磨头抛光特性研究  

Polishing properties of tiny grinding wheel based on magnetorheological effect

作　　者：路家斌[1] 阎秋生[1] 田虹[1] 高伟强[1] 

机构地区：[1]广东工业大学机电工程学院,广州510006

出　　处：《金刚石与磨料磨具工程》2009年第4期24-28,33,共6页Diamond & Abrasives Engineering

基　　金：国家自然科学基金资助项目(50575045;50875050);高等学校博士点学科专项科研基金资助项目(20060562005)

摘　　要：为研究磁流变效应微磨头对玻璃等硬脆材料的抛光性能、考察Fe3O4基电磁流变液的抛光特性,在对微磨头基体的锥台端部的磁感应强度进行仿真分析的基础上,利用Fe3O4基磁流变液添加平均粒度7μm的金刚石微粉对玻璃材料进行了抛光加工实验。实验研究了磁流变效应微磨头抛光玻璃工件时加工间隙、磁感应强度对材料去除的影响,考察了工件表面抛光截面的形状特征。结果显示磁流变效应微磨头定点抛光的加工痕迹呈近似"U"形,工件表面的材料去除主要取决于微磨头与工件表面的研磨压力和磨粒的自我更新能力,材料去除量随着电磁感应器励磁电压的增大而呈线性增大,而随加工间隙的增大呈线性减小。The distribution of the magnetic induction intensity in the polishing area was simulated using 2D finite element analysis software, and experiments were conducted to reveal the polishing performances of the tiny grinding wheel based on the magnetorheological （MR） effect. Fe3 O4-based electro-magneto-rheological MR fluid was used to form dynamical tiny grinding wheel to polish optical glass. The machined surface of the glass with a U-shaped profile demonstrated that the material removal process is dominated by the synergy of the applied pressure on the workpiece to be polished and the self-refreshing ability of the abrasive grains of the tiny grinding wheel. It is also found that the material removal rate is directly proportional to the intensity of external magnetic field and decreases with the extension of the machining distance between the workpiece and the tool.

关 键 词：磁流变效应 微磨头 抛光特性 材料去除 

分 类 号：TG58[金属学及工艺—金属切削加工及机床] TH117.3[机械工程—机械设计及理论]