Title:
METHOD OF MANUFACTURING SEAMLESS TUBE
Document Type and Number:
WIPO Patent Application WO/2004/085086
Kind Code:
A1
Abstract:
A method of manufacturing a seamless tube by applying drawing/rolling and fixed diameter rolling to a raw seamless tube, comprising the steps of obtaining, beforehand, the wall thickness varying portion of the seamless tube where the thickness of the seamless tube varies in the circumferential direction, and drawing/rolling the seamless tube so that the thickness of the drawn/rolled raw seamless tube at a portion corresponding to the wall thickness varying portion is differentiated from the thickness of the seamless tube at general portions other than that portion to suppress the occurrence of the thick wall varying portion in the seamless tube. Thus, the wall thickness of the seamless tube is prevented from being partially varied in the circumferential direction.
Inventors:
IWAMOTO HIROYUKI (JP)
YAMANE AKIHITO (JP)
EGOSHI TOORU (JP)
SASAKI KENICHI (JP)
YAMANE AKIHITO (JP)
EGOSHI TOORU (JP)
SASAKI KENICHI (JP)
Application Number:
PCT/JP2004/004193
Publication Date:
October 07, 2004
Filing Date:
March 25, 2004
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
IWAMOTO HIROYUKI (JP)
YAMANE AKIHITO (JP)
EGOSHI TOORU (JP)
SASAKI KENICHI (JP)
IWAMOTO HIROYUKI (JP)
YAMANE AKIHITO (JP)
EGOSHI TOORU (JP)
SASAKI KENICHI (JP)
International Classes:
B21B17/04; B21B15/00; B21B37/78; (IPC1-7): B21B17/02; B21B23/00
Foreign References:
| JPH07246415A | 1995-09-26 | |||
| JP2001293503A | 2001-10-23 | |||
| JP2002035818A | 2002-02-05 |
Other References:
See also references of EP 1607148A4
Attorney, Agent or Firm:
Hirose, Shoichi (4-2 Nihonbashi Honcho 4-chom, Chuo-ku Tokyo 23, JP)
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