表面技术2025，Vol.54Issue(20)：196-206,216,12.DOI:10.16490/j.cnki.issn.1001-3660.2025.20.014
基于组合磁极的细长管内表面磁粒研磨试验研究
Experimental Study of Magnetic Particle Grinding on Slender Tube Surfaces Based on Combined Magnetic Poles
摘要
Abstract
Magnetic particle grinding is an advanced precision machining technology that enables flexible processing of workpieces with excellent adaptability.However,uneven magnetic field distribution and low magnetic flux density during magnetic particle grinding often result in inconsistent finishing and low efficiency.The work aims to optimize the external magnetic field by arranging magnetic poles based on a single sector-shaped magnetic pole with dimensions of φ35 mm×10 mm× 40 mm and a sector angle of 40° as the fundamental unit,so as to address issues such as low magnetic flux density and uneven grinding. The magnetic field distribution of three pole arrangements—combined magnetic poles with equal volume,Halbach array with opposite polarity,and Halbach array with like polarity-was simulated with Maxwell finite element analysis software.The Halbach array with like polarity exhibited superior performance,with a peak magnetic flux density of 1 032.92 mT and a stable fluctuation around 1 000 mT across all positions,ensuring uniform force distribution on magnetic particles.The force distribu-tion on the inner surface of the tube and the motion state of particles were analyzed with EDEM discrete element simulation software.Under the Halbach array with like polarity,the inner surface exhibited the highest grinding pressure,normal force,and tangential force,with significant fluctuations and intense particle motion,which facilitated particle rolling and renewal.Particle adsorption was uniform across the entire inner surface,with a consistent number of active particles,resulting in high grinding efficiency and excellent uniformity. The test workpiece was a slender SUS304 tube with dimensions of φ8 mm×2 mm×700 mm.Two measurement sections were cut from the tube at positions 20 cm apart.A mixture of 80-mesh magnetic particles and an appropriate amount of grinding fluid was used as the grinding medium.The machining gap was set to 2 mm,and experiments were conducted through three magnetic pole arrangements.The tube rotation speed was 600 r/min,and the feed rate of the magnetic pole device was 2 mm/s.The surface morphology of the tube was observed with a super-depth microscope before and after the experiments.Surface roughness values were measured with a JB-100C horizontal precision roughness tester,and roughness profiles were recorded.The initial surface roughness was approximately Ra 3 μm. Based on experimental results of the three magnetic pole arrangements,the Halbach array with like polarity yielded the best results,significantly improving the inner surface quality of the tube.Initial defects were nearly eliminated,deep scratches were completely removed,and surface roughness profile became smoother.After grinding with the Halbach array with like polarity,the surface roughness values at two positions decreased from Ra 3.045 μm and Ra 3.083 μm to Ra 0.165 μm and Ra 0.175 μm,respectively,achieving a reduction rate of over 94％.This performance surpassed that of the Halbach array with opposite polarity and the combined magnetic poles with equal volume. By modifying the magnetic pole arrangement,the magnetic flux density can be effectively enhanced,and the uniformity of the magnetic field distribution can be improved,thereby increasing the grinding efficiency and consistency of the inner tube surface.关键词
磁粒研磨/组合磁极/磁场分布特性/研磨均匀性/研磨效率/表面粗糙度值Key words
magnetic particle grinding/composite magnetic poles/magnetic field distribution characteristics/grinding uniformity/grinding efficiency/surface roughness value分类
金属材料引用本文复制引用
金宇航,杨海吉,唐嘉斌,韩冰,沈秋实,许晓彤..基于组合磁极的细长管内表面磁粒研磨试验研究[J].表面技术,2025,54(20):196-206,216,12.基金项目
辽宁省教育厅高等学校基本科研项目青年项目(JYTQN2023243) （JYTQN2023243）
辽宁省教育厅一般项目(LJ212510146002)Youth Project of the Basic Research Project of Higher Education Institutions of Liaoning Provincial Department of Education(JYTQN2023243) （LJ212510146002）
General Project of Liaoning Provincial Department of Education(LJ212510146002) （LJ212510146002）
