瓦形磁极对磁粒研磨加工管件内表面的影响  

Influence of Tile Type Magnetic Pole on Inner Surface of Magnetic Abrasive Finishing Grinding Pipe Fittings

作　　者：王金龙 陈燕[1] 张泽群 李文龙 WANG Jin-long;CHEN Yan;ZHANG Ze-qun;LI Wen-long(School of Mechanical Engineering and Automation,University of Science and Technology 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3期158-166,共9页Surface Technology

基　　金：国家自然科学基金(51775258)。

摘　　要：目的 提高磁粒研磨加工厚壁管内表面的表面质量与表面粗糙度改善率。方法 采用聚磁盘与瓦形磁极相配合的方式,通过仿真软件对不同数量的瓦形磁极与聚磁盘的多种组合进行模拟仿真,并分析其磁感应强度变化与磁力线分布。利用磁粒研磨法对管件内表面进行研磨试验验证,研磨后对工件表面粗糙度进行测量,并观察工件表面微观形貌。分析瓦型磁极数量、主轴转速以及磁性磨粒粒径对管件内壁表面质量的影响。结果 不设置瓦形磁极时,在主轴转速为600 r/min、磨粒粒径为185μm、研磨时间为15 min的条件下,管件内表面粗糙度由原始的0.42μm左右降低至0.14μm左右,表面粗糙度改善率为67.05%,表面质量有所改善。设置2个瓦形磁极时,在主轴转速、磨粒粒径、研磨时间与不设置瓦形磁极相同的条件下,管件内表面粗糙度从原始的0.42μm左右降低至0.09μm,表面粗糙度改善率为78.57%,表面缺陷被完全去除。结论 聚磁盘与瓦形磁极相配合的磁极排布方式,使得管件内外形成封闭磁回路,增大了加工区域的磁感应强度并改善了磁场分布,工件内表面的微裂纹、凹坑等表面缺陷基本被去除,获得良好的表面加工质量和较高的表面粗糙度改善率。The work aims to improve the surface quality and surface roughness improvement rate of the inner surface of the thick-wall tube processed by magnetic abrasive finishing, the magnetic induction intensity change and magnetic field line distribution of cooperation between the different number of tile poles and clustered disk were simulated and analyzed by the method of combining clustered disk and tile type magnetic poles with simulation software. The inner surface of the pipe fittings was tested and verified by the magnetic abrasive finishing method. After grinding, the surface roughness of the workpiece was measured, and the microscopic morphology of the workpiece surface was observed. The influence of the number of shoe-shaped magnetic poles, the spindle speed and the particle size of magnetic abrasive finishing on the surface quality of the inner wall of the pipe was analyzed. The results show that under the conditions of no tile magnetic poles were set, spindle speed of 600 r/min,the abrasive particle size of 185 μm and grinding time of 15 min, the original surface roughness of the inner surface of pipe fittings decreased from about 0.42 μm to about 0.14 μm, surface roughness improvement rate was 67.05% and the surface quality was improved;under setting two tile magnetic poles, and the same conditions of, pipe rotation speed, the surface roughness of pipe fittings decreased from 0.42 μm to 0.09 μm, surface roughness improvement rate was 78.57% and the surface defects were completely removed. The magnetic pole distribution with the combination of clustered disk and magnetic tile can form a closed magnetic loop inside and outside the pipe fitting, which magnetic induction intensity of the processing area is improved and the processing efficiency is improved. Surface defects such as micro-cracks and pits on the inner surface of the workpiece are basically removed, and good surface machining quality and higher surface roughness improvement rate is obtained.

关 键 词：磁粒研磨 聚磁盘 SS304不锈钢 瓦形磁极 磁极排布 表面粗糙度 

分 类 号：TG356.28[金属学及工艺—金属压力加工]