Method and apparatus for forming a modified a cross-section...

Details Method and apparatus for forming a modified a cross-section... Method and apparatus for forming a modified a cross-section...

2005-06-07

2005-06-07

Larson, Lowell A. (Department: 3725)

Metal deforming

By use of roller or roller-like tool-element

Included in roller-cluster

C029S888070

Reexamination Certificate

active

06901782

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).

REFERENCES:
patent: 1606875 (1926-11-01), Heinauer
patent: 3513679 (1970-05-01), Dechene et al.
patent: 4085490 (1978-04-01), McCormick et al.
patent: 4776195 (1988-10-01), Fukuhara et al.
patent: 4833906 (1989-05-01), Potucek
patent: 5304262 (1994-04-01), Karaoke et al.
patent: 6247225 (2001-06-01), Snitchler et al.
patent: 63179017 (1988-07-01), None
patent: 05-15496 (1993-06-01), None

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