MAGNETIC POLISHING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a magnetic polishing method capable of performing mirror polishing to the whole surface including a concave surface evenly without moving a polishing tool along a surface of a workpiece (mainly upward and downward movement from planar surface to concave surface) even if the workpiece has the concave surface.SOLUTION: The magnetic polishing method for the workpiece W having the concave surface uses a polishing device 1 that includes: a polishing fluid containing a magnetic particle, a non-magnetic abrasive grain and a magnetic fluid; a polishing tool 3 formed of a magnetic material; and a coil 2 having a through-hole in an axial direction thereof, where the polishing tool 3 is inserted through the through-hole of the coil 2. The magnetic polishing method performs mirror polishing by maintaining a clearance between the polishing tool 3 and the workpiece W at 1.0-1.5 mm while rotating the polishing tool 3 in a state where the coil 2 is energized with a pulse voltage.