Abstract: It is difficult to polish the inner surface of the slender tube with traditional polishing method; using the magnetic brush controlled by magnetic fields can realize polishing the inner surface of complex tube easily. This polishing method is mixture of the magnetic abrasives and oily slurries wrapped to the magnetic pole of the V-shaped magnet, pressing the mixture onto the inner surface of the workpiece under the external magnet’s attraction, increasing the polishing force, and improving the polishing efficiency. The magnetic abrasive attached to the V-shaped magnet slotted on the end is more spontaneous mixing, and constantly turning over to polish the workpiece surface. Through finite element analysis of the V-shaped magnet slotted on the end, verified the effect on the polishing force to workpiece surface, and theoretically explained the slotted magnet can easily realize the magnetic abrasive’s replacement to get better surface quality. Finally, the theory’s correctness is verified by the polishing experiment to SUS304 tube.

Key words: V-shaped magnet;abrasive spontaneously-mixing phenomenon;surface roughness;precision polishing