PURPOSE: To polish the inside surface of a pipe with high smoothness, even if the pipe is of a long size.
CONSTITUTION: A ferromagnetic body 3 stuck with an insulator such as a polishing nonwoven fabric 2 having elasticity and permeability, a buff or sponge is inserted into a pipe 1, and the insulator is pressed against the inside surface of the pipe through the ferromagnetic body 3 by the magnetic force due to a magnet 8 that has been arranged outside the pipe 1. An electrolyte 6 is supplied inside the pipe 1, and a current is supplied between the ferromagnetic body 3 and the pipe 1 making a negative electrode of the ferromagnetic body 3 and a positive electrode of the pipe 1, so that the inside surface of the pipe is electrolytically polished and at the same time the pipe and the ferromagnetic body are relatively moved. In the electrolyte 6, polishing abrasive grains may be mixed. Thereby, the ferromagnetic body 3 is pressed against the inside surface of the pipe by a magnetic force, and is movable in the radial or axial directions. Thus, the need of members for supporting the ferromagnetic body 3 can be dispensed with, and even the inside polishing of a large-size pipe can be facilitated.
| JP2008114301 | TILTING TYPE MAGNETIC ABRASIVE FINISHING MACHINE |
| JP2009023037 | MAGNETIC POLISHING APPARATUS |
| JPS5327193 | ABRASIVE PROCESS |
KUROBE ATSUSHI
ENOKI KOJI
NAKAMOTO KAZUNARI
