Effect of magnetic pole on finishing characteristics in low-frequency alternating magnetic field for micro-groove surface

A magnetic abrasive nano-polishing process using low-frequency alternating magnetic field was developed for micro-grooves surface in this study. And by using alternating magnetic force produced by low-frequency (3 Hz) alternating magnetic field to make magnetic cluster generates a cyclical fluctuation of up and down, and then promotes the abrasives into micro-groove surface. A set of experimental devices were designed to investigate the effect of magnetic pole shape on magnetic field distribution and finishing characteristics. Final experiments were performed on glass and alloy steel specimens to examine the polishing performance for micro-groove surface. The glass initial surface roughness (Ra) of 123.38 nm, 130.71 nm, 136.08 nm, and 129.39 nm decreased respectively to 55.18 nm, 50.92 nm, 65.62 nm, and 62.42 nm and the groove surfaces obtained obvious improvement by this process. The surface roughness (Ra) of alloy steel is reduced as low as 68.70 nm from 192.48 nm, and the burr of edge and groove surface was removed effectively after 20-min polishing. It is demonstrated that this process is effective for deburring and improving micro-groove surface quality.