Title:
DRAWING/ROLLING CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2006/106938
Kind Code:
A1
Abstract:
A drawing/rolling control method capable of manufacturing a raw tube with high dimensional accuracy and suppressing a trouble in rolling. The groove bottom wall thickness of the raw tube (P) is measured on a &num 1 stand with an ultrasonic wall thickness meter (1) installed between the &num 1 stand and a &num 2 stand, the outer diameter of a mandrel bar (B) is calculated based on the set value of a roll gap and the groove bottom wall thickness of the raw tube (P) on the &num 1 stand, and the longitudinal portion of the mandrel bar (B) at which its outer diameter is calculated based on information on the position of a bar retainer (BR) is specified. By repeating the steps above, the longitudinal distribution of the outer diameters of the mandrel bar is calculated, the longitudinal portions of the mandrel bar in contact with the raw tube on subsequent stage stands are specified based on the information on the position of the bar retainer, and the roll gaps on the subsequent stage stands are set based on the outer diameters of the specified longitudinal portions of the mandrel bar.
Inventors:
IWAMOTO HIROYUKI (JP)
Application Number:
PCT/JP2006/306874
Publication Date:
October 12, 2006
Filing Date:
March 31, 2006
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
IWAMOTO HIROYUKI (JP)
IWAMOTO HIROYUKI (JP)
International Classes:
B21B37/78; B21B17/02
Domestic Patent References:
| WO1998055243A1 | 1998-12-10 |
Foreign References:
| JPS6193904A | 1986-05-12 | |||
| JPS61135409A | 1986-06-23 | |||
| JPH0871616A | 1996-03-19 |
Other References:
See also references of EP 1911533A4
ROLAND KECK ET AL.: "Wall thickness measurement of 1230 C hot tube blanks with a new type of laser ultrasonic system", STAHL U EISEN, no. 22, 1987, pages 63
ROLAND KECK ET AL.: "Wall thickness measurement of 1230 C hot tube blanks with a new type of laser ultrasonic system", STAHL U EISEN, no. 22, 1987, pages 63
Attorney, Agent or Firm:
Hirose, Shoichi (4-2 Nihonbashi Honcho 4-chom, Chuo-ku Tokyo 23, JP)
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