COLD FINISH SEAMLESS STEEL PIPE FOR DRIVE SHAFT AND METHOD FOR PRODUCING THE SAME

Title:

COLD FINISH SEAMLESS STEEL PIPE FOR DRIVE SHAFT AND METHOD FOR PRODUCING THE SAME

Document Type and Number:

WIPO Patent Application WO/2007/111258

Kind Code:

A1

Abstract:

The quantity of S contained in designing steel component is reduced, a stretch reducer makes a rolling roll to have a hole type profile closer to a true circle in sizing rolling, and a pipe is made to have an appropriate profile ratio (ratio between the radius of curvature of the inner surface and the average inner radius) at the position corresponding to an edge portion. Even when the inner surface of a blank pipe subjected to sizing rolling is creased, a predetermined thickness workability is ensured in subsequent cold elongation, and therefore the pipe is applicable as a drive shaft for an automobile and can be used as a high strength hollow member excellent in fatigue strength and most suitable for reducing the weight and ensuring silence. Consequently, a drive shaft for an automobile can be produced inexpensively and efficiently.

Inventors:

YAMAMOTO TADAYUKI (JP)

Application Number:

PCT/JP2007/056049

Publication Date:

October 04, 2007

Filing Date:

March 23, 2007

Export Citation:

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Assignee:

SUMITOMO METAL IND (JP)
YAMAMOTO TADAYUKI (JP)

International Classes:

B21B17/14; B21B23/00; B21B27/02; B21C1/22; C22C38/00; C22C38/06; C22C38/58

Domestic Patent References:

WO2005092531A1	2005-10-06
WO2005092531A1	2005-10-06

Foreign References:

JP2002361319A	2002-12-17
JP2006037205A	2006-02-09
JPH10140249A	1998-05-26
JPH11290956A	1999-10-26
JP2822849B2	1998-11-11

Other References: