Title:
PRODUCTION METHOD FOR H-BEAMS
Document Type and Number:
WIPO Patent Application WO/2019/156078
Kind Code:
A1
Abstract:
With this method, flat shape rolling of large preform is performed without generating problems such as elongation along the web height direction and deformation of a flange-equivalent part, and H-beam products having a wider flange than conventional H-beam products are produced in an efficient and stable manner. In this method, a roughing rolling step includes an edging-rolling step and a flat rolling step that involves rotating a rolling material that has undergone the edging-rolling step and rolling the web. Out of the calibers that are used in carrying out the flat rolling step, at least one caliber has upper and lower caliber rolls provided, on the longitudinal center of the roll body, with a recess for forming a ridge along the center of the web of the rolling material. The calibers that are used in carrying out the flat rolling step further include a ridge erasing caliber that presses down the ridge formed on the rolling material, and widens the internal dimension of the web of the rolling material. The shape rolling using the ridge erasing caliber is performed on the rolling material after the ridge has been formed thereon with the caliber having the recess for forming the ridge, and the shape rolling for forming the ridge is not performed after the pressing down of the ridge.
Inventors:
YAMASHITA HIROSHI (JP)
Application Number:
PCT/JP2019/004082
Publication Date:
August 15, 2019
Filing Date:
February 05, 2019
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
B21B1/088; B21B1/08
Foreign References:
| JPS57171501A | 1982-10-22 | |||
| JP2017221947A | 2017-12-21 | |||
| JPH0531553A | 1993-02-09 | |||
| JPS57146405A | 1982-09-09 | |||
| JPH0788501A | 1995-04-04 | |||
| JPS57146405A | 1982-09-09 |
Attorney, Agent or Firm:
HAGIWARA, Yasushi et al. (JP)
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