Title:
異形線材の成形方法と装置
Document Type and Number:
Japanese Patent JP4457336
Kind Code:
B2
Abstract:
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 ( 15 ) comprising in combination a non-powered pre-stage four-roll turks-head ( 16 ) and a powered post-staged four-roll turks-head ( 17 ). Disposed in tandem and downstream of the forming unit ( 15 ) is a non-powered finishing four-roll turks-head ( 21 ). A forming roll of the powered turks-head ( 17 ) 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 ( 16 ) and the powered turks-head ( 17 ), and at a tension of from 50 to 200 N between the forming unit ( 15 ) and the finishing turks-head ( 21 ).
Inventors:
Takao Mikami
Masugata Yoshiki
Takao Kara
Masugata Yoshiki
Takao Kara
Application Number:
JP2001229034A
Publication Date:
April 28, 2010
Filing Date:
July 30, 2001
Export Citation:
Assignee:
Hitachi Metals Co., Ltd.
International Classes:
B21B1/16; B21C3/08; B21C37/04; B21B1/08; B21B1/18; B21B13/10; B21B15/00; B21B27/02
Domestic Patent References:
| JP8174129A | ||||
| JP5069032A | ||||
| JP2001038410A | ||||
| JP6272763A |
Attorney, Agent or Firm:
Masato Yashima
Takao Sakurai
Takao Sakurai