Mitsubishi Denki Kabushiki Kaisha

Nippon Kokan Kabushiki Kaisha

Mitugi Kawano

Tetsuro Urata

Kunihiko Sato

Takeo Uebayashi

Tetsuhiro Asamoto

Kobun Asakawa

Disclosed is a process for subjecting the outer surface of a satinizing roll to electrical discharge machining to produce, on the roll surface, a satin-like roughened surface with a uniform roughness. With the electrical discharge machining process, a plurality of electrodes of the same shape are mounted at equal pitches on each of a plurality of head columns, and the head columns are repeatedly reciprocally fed traversely along the axis of rotation of a roll over a predetermined distance which does not cause any stepped portions on the roll surface to effect the electrical discharge machining. The feeding of the electrodes toward the surface of the roll is separately controlled for each head column. To obtain the optimum working results, the head columns are repeatedly reciprocally fed traversely over a distance equal to the electrode mounting pitch.

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Fukuyama, Japan

Mitugi Kawano