Title:
TUBE MANUFACTURING METHOD AND APPARATUS FOR FIXED DIAMETER ROLLING
Document Type and Number:
WIPO Patent Application WO/2005/092531
Kind Code:
A1
Abstract:
A tube manufacturing method, comprising a step for rolling a tube at a fixed diameter by using an apparatus for fixed diameter rolling formed of a plurality of stands having a plurality of hole type rolling rolls. The method is characterized in that, where the minimum value of angles formed by the tangents drawn on the opposed edge parts of the hole type rolling rolls adjacent to each other in all stands is β (deg), the outer diameter of the tube on the out-side of the apparatus for fixed diameter rolling is D (mm), and the wall thickness of the tube on the out-side of the apparatus for fixed diameter rolling is t (mm), such a hole type rolling roll that the angle β can fulfill the requirement of the following expression (1) is used. β ≥ 1.13 × 10 × Ln (t/D × 100) + 1.37 × 102 ... (1)
Inventors:
INAGE TAKATERU (JP)
OKUI TATSUYA (JP)
OKUI TATSUYA (JP)
Application Number:
PCT/JP2005/005198
Publication Date:
October 06, 2005
Filing Date:
March 23, 2005
Export Citation:
Assignee:
SUMITOMO METAL IND (JP)
INAGE TAKATERU (JP)
OKUI TATSUYA (JP)
INAGE TAKATERU (JP)
OKUI TATSUYA (JP)
International Classes:
B21B17/14; B21B27/02; (IPC1-7): B21B17/14; B21B27/02
Foreign References:
| JPH10156412A | 1998-06-16 | |||
| JPS61216805A | 1986-09-26 | |||
| JPH10156412A | 1998-06-16 |
Other References:
See also references of EP 1731234A4
Attorney, Agent or Firm:
Ohnaka, Minoru (3-6 Minamisemba 2-chome, Chuo-k, Osaka-shi Osaka 81, JP)
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