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 (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
Application Number:
JP2007/056049
Publication Date:
October 04, 2007
Filing Date:
March 23, 2007
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, Osaka 41, 5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 5410041, JP)
International Classes:
B21B17/14; B21B23/00; B21B27/02; B21C1/22; C22C38/00; C22C38/06; C22C38/58; B21B17/00; B21B23/00; B21B27/02; B21C1/16; C22C38/00; C22C38/06; C22C38/58
Attorney, Agent or Firm:
MORI, Michio (M. MORI PATENT OFFICE, Amagasaki Building17-23, Higashinaniwa-cho 5-chom, Amagasaki-shi Hyogo 92, 6600892, JP)
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