关键词: 磁流变弹性体磨具, 磁性磨具, 磁场辅助成形, 磁流变效应, 超精密加工

Abstract: MREAT, a new flexibility-controlled material used for grinding and polishing was developed to solve the problems of low machining efficiency, causing surface damages and difficulty in polishing complex curved surfaces in the ultra-precision machining processes. The influences of external magnetic fields on the microstructure and properties of MREAT were studied. A heat-magnet-force coupled device was designed to prepare anisotropic and isotropic MREATs with and without magnetic fields. Then the influences of external magnetic fields on the microstructure, compression mechanics properties and material removal properties of the new abrasive tool were analyzed. The results show that the magnetic field applied during the preparation processes causes the interior of the MREAT to appear as microscopic chains composed of carbonyl iron particles. After the preparation is complete, the compressive elastic modulus and polishing performance of the MREAT continue to increase with the increase of the magnetic fields. By analyzing the influences of the magnetic fields on the microstructure and performance of the MREAT, it is proved that the MREAT may realize the magnetically controlled flexible polishing processes.

Key words: magnetorheological elastomer abrasive tool(MREAT), magnetic abrasive tool, magnetic field-assisted compression molding, magnetorheological effect, ultra-precision machining