B - Operations – Transporting – 23 – H
Patent
B - Operations, Transporting
23
H
B23H 5/08 (2006.01) B23H 5/10 (2006.01) B23H 9/00 (2006.01) C25F 3/16 (2006.01)
Patent
CA 2044581
An electro-abrasive polishing process of the inner surface of pipes to an extra-smooth mirror finish com- prises a preliminary-polishing process and a subsequent mirror-finishing process. The preliminary-polishing process is continued until the roughness of the inner surface of the small-diameter pipe is reduced to at least 0.5 µm Rmax or less by electro-abrasive polishing process of the inner surface of the small-diameter pipe by inserting a preliminary-polishing tool electrode comprising a core electrode wrapped with a non-woven nylon sheet in the small-diameter pipe to be polished and passing a small amount of current through the elec- trolyte between the small-diameter pipe that serves as the anode and the tool electrode that serves as the cathode and, at the same, time, by mechanically polishing the inner surface of the small-diameter pipe by rotating the tool electrode and axially reciprocating it or the small-diameter pipe relative to each other. In the subsequent mirror-finishing process, similar polishing operations are repeated using a mirror-finishing tool electrode that comprises a core electrode wrapped with urethane sheet. The preliminary-polishing process is switched to the subsequent mirror-finishing process in appropriate timing. As the electrolytic decomposition by the preliminary-polishing and mirror-finishing tools and the rotation of the tools and axial reciprocation of them or the small-diameter pipe relative to each other in the two processes work so effectively that the original surface roughness of approximately 3 µm Rmax is reduced to a mirror finish level of approximately tens of nanometer.
Asagawa Keiichirou
Seimiya Kouichi
Japan As Represented By Director-General Of Agency Of Industrial
Kirby Eades Gale Baker
LandOfFree
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