基于无理数转速比的导磁轴套磁粒研磨试验  

Magnetic Particle Grinding Test of Permeable Bushing Based on Irrational Rotational Speed Ratio

作　　者：张祥 马小刚[1] 韩冰[1] ZHANG Xiang;MA Xiao-gang;HAN Bing(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Liaoning Anshan 114051,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051

出　　处：《表面技术》2022年第12期269-276,共8页Surface Technology

基　　金：国家自然科学基金(51775258);辽宁省自然科学基金重点项目(20170540458);精密与特种加工教育部重点实验室基金(B201703)。

摘　　要：目的解决大型导磁类零件内表面的精密研磨加工困难、加工效率低等问题。方法采用旋转磁极方法对内表面进行磁粒研磨。工件由车床主轴驱动旋转,将磁极伸入工件内部,并在电机驱动旋转的同时,随着车床刀架往复进给,驱使磁极与工件内表面之间填充的磁性磨粒摩擦工件表面,完成对工件内表面的光整加工。利用ADAMS软件对有理数和无理数转速比下的研磨轨迹进行模拟,讨论不同转速比对研磨轨迹和工件表面质量的影响;采用响应面法将影响研磨的主要工艺参数(工件转速、磁极转速、磁性磨粒粒径)进行优化设计;通过研磨试验分析表面形貌和表面粗糙度数据,验证优化后工艺参数的可靠性。结果采用响应面法分析可知,当工件转速为98 r/min、磁极转速为2435 r/min、磁性磨粒粒径为190μm、磁粒研磨加工时间为40 min时,工件的表面粗糙度从原始Ra 3.32μm降至Ra 0.198μm,表面粗糙度改善率(ΔRa)为94.04%。工件表面划痕、加工纹理等表面缺陷得到了有效去除,加工后工件表面更加光亮、均匀,大幅提高了工件的使用寿命。结论当磁极与工件的转速比为无理数时,其研磨效果最好,研磨轨迹的干涉效果更好,单位面积内的交错次数更多,交织出的网状结构网格更均匀、致密,未加工区域面积更小。采用响应面法能够对试验结果进行优化参数数学建模设计,拟合出的最佳工艺参数组合可提高大型导磁材料轴套类零件的加工效率和表面质量。The work aims to solve the problems of difficult processing and low processing efficiency encountered in the precision grinding process of the inner surface of large magnetic conductive parts.The inner surface was ground with magnetic particles by the rotating magnetic pole method.The workpiece was driven to rotate by the spindle of the lathe,and the magnetic pole extended into the workpiece and fed back and forth with the lathe tool rest while driven by the motor to rotate.The magnetic abrasive particles filled between the magnetic pole and the inner surface of the workpiece were driven to rub the workpiece surface to complete the finishing process of the inner surface.ADAMS software was used to simulate the grinding trajectory under rational and irrational speed ratios.The effects of different rational and irrational speed ratios on grinding trajectory and workpiece surface quality were discussed respectively.The main process parameters(workpiece speed,magnetic pole speed and magnetic particle size)affecting the grinding were optimized by response surface method.The surface morphology and surface roughness data were analyzed by grinding test to verify the reliability of the optimized process parameters.From the response surface analysis,when the workpiece speed was 98 r/min,the magnetic pole speed was 2435 r/min,the magnetic particle size was 190μm,and the magnetic particle grinding time was 40 min,the workpiece surface roughness decreased greatly,and the surface roughness decreased from Ra 3.32μm to Ra 0.198μm.The surface roughness improvement rate(ΔRa)was 94.04%.The surface defects such as scratches and processing textures on the workpiece surface after grinding under irrational speed ratio were effectively removed,and the processed surface was brighter and more uniform,which could greatly improve the service life of the workpiece.When the ratio of the magnetic pole speed to the workpiece speed is a rational integer,the grinding effect is the best,the interference effect of grinding trajectory is better,t

关 键 词：无理数转速比 有理数转速比 研磨轨迹 磁粒研磨 响应面法 导磁轴套 

分 类 号：TG176[金属学及工艺—金属表面处理]