Study on the Grinding and Polishing Application of Abrasive Particle-Reinforced Magnetorheological Elastomer; [磨料颗粒增强磁流变弹性体的磨抛应用研究]

초록

As conventional rigid abrasive tools struggle to balance machining efficiency, surface quality and integrity when used to deal with hard and brittle materials with complex surface features, a novel abrasive machining method, which used abrasive particle-reinforced magnetorheological elastomer(A-MRE), was proposed in this study. Firstly, a preparation process of A-MRE was designed, considering the chain network assembly behavior of magnetic particles and abrasive grains in the silicone rubber matrix. Then, a representative volume element(RVE)model was established through the observation of microscopic structure. The effect of a magnetic field on the holding behavior of softness consolidation abrasive grains was investigated through theoretical analysis and fem simulation. Finally, an experimental SiC material abrasive machining was carried out using A-MRE tools, and the surface quality and material removal rate were analyzed under different magnetic field conditions. The research results show that the maximum abrasive grain holding stress occurs when the magnetic field direction and the chain direction of the magnetic particles form a 0° angle, and the stress increases with higher magnetic field intensities. When applying a compressive strain of 1.5 μm to the A-MRE tool, the maximum holding stress reaches 396.63 kPa. Comparing the A-MRE tool's machining performance to the case without a magnetic field, it is observed that employing a magnetic field intensity of 0.35 T leads to an 80.3% reduction in SiC material's surface roughness, a 28.6% increase in material removal, and a 56.1% reduction in tool wear. These findings confirm the feasibility of A-MRE as the material of elastic abrasive tools. © 2023 Xi'an Jiaotong University. All rights reserved.

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