Title:
METHOD FOR STRAIGHTENING WIDE THICK PLATE PRODUCT
Document Type and Number:
Japanese Patent JP3924276
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for efficiently straightening a thick plate product, which can produce a high quality wide thick plate product which has a good flatness and causes no wave nor bend when cut into a predetermined size.
SOLUTION: The method is applied for straightening of a wide thick plate product being relatively thin among thick plates and having 5-10 mm thickness and 2.5 m or more width. A plate rolling mill has a structure to support working rolls with divided back-up rolls axially dividing a roller assembly into at least three divisions, on either of vertical sides. The plate rolling mill also has a load detection device, a roll-down structure, and a roll-down position detection device, divided independently for each divided back-up roll. When the product is straightened in an elongation rate between 0.05% and 1.20%, it is rolled in an elongation rate to obtain a desired flatness on the basis of a table of the preset elongation rate, flatness or the like. When the flatness of the product exceeds an allowance of the desired flatness, it is finish-straightened with a roller leveler.
Inventors:
Toshiyuki Shiraishi
Toru Akashi
Kenji Yamada
Yutaka Satano
Takeshita Koichiro
Toru Akashi
Kenji Yamada
Yutaka Satano
Takeshita Koichiro
Application Number:
JP2003360350A
Publication Date:
June 06, 2007
Filing Date:
October 21, 2003
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
B21B1/22; B21B37/56; B21B1/38; B21B37/00; B21D1/05; (IPC1-7): B21B37/56; B21B1/22; B21B1/38; B21B37/00; B21D1/05
Domestic Patent References:
| JP2000167604A | ||||
| JP2001137930A |
Attorney, Agent or Firm:
Tomoyuki Yabuki
Tsugeko Shigeo
Tsugeko Shigeo