渐开线磁极组研磨双面的相对角度试验  

Experiments on relative angles of grinding two sides of involute pole groups

作　　者：刘杰 焦安源 薄啟帆 丁云龙 陈燕[1] LIU Jie;JIAO Anyuan;BO Qifan;DING Yunlong;CHEN Yan(School of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,Liaoning,China;School of Applied Technology,University of Science and Technology Liaoning,Anshan 114051,Liaoning,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 [2]辽宁科技大学应用技术学院,辽宁鞍山114051

出　　处：《金刚石与磨料磨具工程》2024年第5期685-694,共10页Diamond & Abrasives Engineering

基　　金：辽宁省教育厅项目(LJKZ0295);辽宁省自然科学基金项目(2019-ZD-0029)。

摘　　要：为解决钛合金TC4表面的凸起、划痕和微裂纹等缺陷问题,提出一种对立磁极组产生相对角度的双面磁粒研磨方式,从而提高其研磨效率。在双面旋转研磨试验的基础上,对磁性磨粒进行受力分析,通过渐开线排布磁石的设计,对比该磁极下磁感应强度的变化,进而分析对立磁极组产生相对角度的磁场梯度对表面质量的影响规律,最后进行表面粗糙度变化检测,以及对研磨前后的工件表面微观形貌检测。结果表明:采用渐开线排布磁石,覆盖面积相对较大并且磁场分布均匀;相对角度10°双面研磨时,磁场梯度变化较大,有利于磁性磨粒的及时翻滚。工件正面的表面粗糙度R_(a)由初始的0.458μm降至0.116μm,表面高度差由原始的43.3μm降至7.8μm;工件反面的表面粗糙度R_(a)由初始的0.434μm降至0.111μm,表面高度差由原始的44.2μm降至8.4μm。通过渐开线排布磁石产生相对角度的研磨加工,工件表面的凸起、划痕、沟壑和微裂纹等缺陷得到明显改善,工件双面同时研磨,提高了研磨效率。Objectives:Titanium alloys are increasingly widely used in the aerospace field,and their research and development significantly influence the advancement of military aircraft,civil aviation,engines,and other high-tech equipment.However,titanium alloy are challenging to machine due to theri small deformation coefficient,low thermal conductivity,and the high temperatures generated during traditional cutting methods,which leads to tool wear.As a result,parts often have low precision,and surface quality is generally poor.This study proposes a double-sided magnetic abrasive finishing(MAF)method using opposing magnetic pole sets with adjustable relative angles to address surface defects−such as bumps,scratches,and microcracks−on the surface of titanium alloy TC4 and to improve its grinding efficiency.Methods:This study compares three types of lined magnets and introduces an involute-lined magnet design.Based on this design,opposing magnetic pole sets are used to generate an initial relative angle between them.The effects of different relative angles on double-sided MAF are tested to determine whether this method can improve the magnetic induction intensity and promote a more uniform distribution of abrasives.The results show that this approach addresses the challenges of poor abrasive fluidity and the inability of abrasives to tumble effectively.Additionally,the simultaneous grinding of both sides of the workpiece enhances processing efficiency,effectively removes the surface defects of the workpiece,and improves the grinding efficiency and surface quality.Results:The application of involutelined magnets with a relative angle for double-sided MAF yields improved processing results under the following test conditions:magnetic pole group speed of 600 r/min,processing gap of 2 mm,magnetic abrasives size of 150μm,and a relative angle of 10°.After 30 minutes of grinding,the surface roughness of the front side of the titanium alloy is reduced from Ra 0.458μm to R_(a)0.116μm,and the surface height variation decreases

关 键 词：双面磁粒研磨 磁极设计 相对角度 梯度对比 表面质量 

分 类 号：TG176[金属学及工艺—金属表面处理]