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A new internal finishing process applying a rotating magnetic field generated by electromagnetic coils is created and its finishing apparatus is developed of a non-ferromagnetic tubing, in which a magnetic finishing tool newly developed is rotated by the magnetic action force along the internal surface of a tubing. By this new process, the internal surfaces of the various tubings are finished easy such as a long tubing of about 5m in length or a curved tubing, which are unable to rotate at high speed. From the experimental results, it is found that (1) the new magnetic finishing tool using a permanent magnet is suitable for high speed rotation along the internal surface of a tubing, (2) a magnetic finishing tool is rotated smoothly at the same frequency as a rotating magnetic field, and (3) the surface roughness of 5.2μmRmax before finishing is improved to the value of 0.6μmRmax in the finishing experiment of a brass tubing using the magnetic finishing tool sticked an abrasive belt on its surface.

A new internal finishing process of a non-ferromagnetic tubing by applying a rotating magnetic field.