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Volume 45 Issue 4
Aug.  2025
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Article Navigation >  Diamond & Abrasives Engineering  > 2025  >  45(4): 517-525
WANG Xuanping, GUO Yiao, PENG Can, YU Yang. Research on preparation of adhesive magnetic polishing abrasives and polishing performance[J]. Diamond & Abrasives Engineering, 2025, 45(4): 517-525. doi: 10.13394/j.cnki.jgszz.2024.0077
Citation: WANG Xuanping, GUO Yiao, PENG Can, YU Yang. Research on preparation of adhesive magnetic polishing abrasives and polishing performance[J]. Diamond & Abrasives Engineering, 2025, 45(4): 517-525. doi: 10.13394/j.cnki.jgszz.2024.0077
shu

Research on preparation of adhesive magnetic polishing abrasives and polishing performance

doi: 10.13394/j.cnki.jgszz.2024.0077

  • National Key Laboratory of High Performance Precision Manufacturing, Dalian University of Technology, Dalian, 116024, Liaoning, China

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  • Received Date: 2024-04-24
  • Accepted Date: 2024-08-13
  • Rev Recd Date: 2024-07-05
    Abstract
  •   Objectives  With the increasing demand for parts with complex shapes and fine structures in high-end equipment, the requirements for finishing precision and surface quality are becoming more stringent. Magnetic polishing technology relies on magnetic fields to drive magnetic abrasives to move relative to the parts, allowing for simultaneous polishing of multiple complex parts. It is an effective method for achieving high-quality and efficient finishing of parts with complex shapes and fine structures. Magnetic abrasives serve as the "cutting tools" in magnetic polishing, and their preparation is a key technology in this process. Magnetic abrasives prepared by sintering, bonding, and atomization methods possess good polishing effects, however, they need be crushed into powdery particles for use, which causes inconvenience in magnetic polishing. Research on the preparation of magnetic abrasives is therefore indispensable to meet the demands of high-performance polishing.   Methods  To enhance the performance of magnetic polishing, a slender bonded magnetic abrasive is designed, where carbonyl iron powders are adopted as the magnetic phase and silicon carbide are adopted as the abrasive phase. The two-phase materials are bonded with resin chemicals, and bonding strength is enhanced through chemical modification using a coupling agent. The movement patterns and material removal mechanisms of the prepared magnetic abrasives are analyzed to explore their differences from conventional stainless-steel magnetic needles. The differences in scratch behavior at the micro level are experimentally studied using aluminum alloy samples, and the impact on polishing quality is studied. Preparation of magnetic polishing abrasives: First, carbonyl or silicon carbide powders are separately added into a 0.1 g/mL dilute NaOH solution in a beaker, fully submerged, and stirred at constant temperature, then washed with anhydrous ethanol until neutral and dried. Second, the treated carbonyl iron powders or silicon carbide powders are placed in a beaker, a silane coupling agent KH-560 is added, and the mixture is processed in a water bath to obtain dried powders. Third, the above-modified carbonyl iron powders and silicon carbide powders are weighed and mixed in a predetermined mass ratio, and stirred for 6 hours to solve the problem of uneven powder agglomeration. Finally, a predetermined ratio of epoxy resin is added to the mixed inorganic powders, and slender magnetic abrasives with a diameter of 2-3 mm and a length of 6-8 mm are obtained through extrusion molding, followed by a 24 h curing treatment at room temperature.   Results  A study is conducted on the material removal effect of magnetic abrasives. The polishing effects of workpiece surfaces using magnetic needles and magnetic abrasives are compared. The elasticity of the bonded magnetic abrasives is significantly higher than that of magnetic needles, resulting in a weaker impact on workpieces, with polishing mainly achieved by the embedded silicon carbide abrasives. To facilitate observation of scratches in magnetic polishing, 6061 aluminum alloy workpieces with an initial surface roughness of Sa 4 nm are adopted for magnetic polishing experiments, for exploration of differences in polishing between magnetic needles and elastic magnetic abrasives. With magnetic needles, the surface texture caused by the superposition of pits formed by needle impact tends to stablilize after 30 min of polishing, achieving a surface roughness of Sa 1.418 μm. With magnetic abrasives, the surface texture caused by abrasive scratches tends to stabilize after 20 min of polishing, achieving a surface roughness of Sa 0.318 μm.   Conclusions  A preparation method is proposed for the fabrication of slender, elastic magnetic abrasives. Material removal mechanisms and surface morphology formation are analyzed, and experiments on 6061 aluminum alloy workpieces are carried out to compare conventional magnetic needles with the slender magnetic abrasives. The results show that elastic magnetic abrasives possess higher polishing efficiency and achieve better polishing effects than magnetic needles for metal materials such as 6061 aluminum alloy.

     

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