Hitachi Metals, Ltd.

Takao Mikami

Yoshiki Masugata

Takao Karaoke

A modified cross-section wire material is formed into piston rings such as oil-control rings for use in an engine. An apparatus of the present invention for forming the modified cross-section wire material has a forming unit () comprising in combination a non-powered pre-stage four-roll turks-head () and a powered post-staged four-roll turks-head (). Disposed in tandem and downstream of the forming unit () is a non-powered finishing four-roll turks-head (). A forming roll of the powered turks-head () has a diameter equal to or larger than 70 times as much as a height-of a flange of the material. In forming, the material is kept at a tension equal to or less than 300 N between the non-powered turks-head stand () and the powered turks-head (), and at a tension of from 50 to 200 N between the forming unit () and the finishing turks-head ().

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Sakaiminato, Japan

Takao Mikami