Title:
METHOD OF HOT-ROLLING STEEL SHEET AND HOT FINISHING MILL
Document Type and Number:
Japanese Patent JP3458591
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To eliminate the instability of threading and to manufacture the good quality of steel sheets by making the diameter of one of an upper and lower work rolls larger than that of the other roll and taking the clearance between the bearings of a work roll having the larger diameter and a housing at ≤1mm.
SOLUTION: The diameter of the lower work roll 1a is made larger than the diameter of the upper work roll 1b by 0.5mm and the clearance between the bearing box 3 of the lower work roll 1a and the liner metal 5 of the housing 4 is taken as about 1mm. The clearance between the bearing box 3 of the upper work roll and the housing 4 is taken as about 2mm. By the operation of a hydraulic cylinder 6 which is attached to the roll chock 3a of the bearing box 3 of the lower work roll 1a, the clearance between the roll chock 3a and the liner metal 5 is eliminated. In this way, the generation of instability of threading is prevented and the good quality of the steel sheet is manufactured at high yield.
Inventors:
Fumio Fujita
Hayatoshi Murata
Matsuo Yoshimoto
Masaaki Yamamoto
Hayatoshi Murata
Matsuo Yoshimoto
Masaaki Yamamoto
Application Number:
JP7249596A
Publication Date:
October 20, 2003
Filing Date:
March 27, 1996
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
B21B27/02; B21B1/26; B21B31/02; B21B31/07; (IPC1-7): B21B1/26; B21B27/02; B21B31/02; B21B31/07
Domestic Patent References:
| JP4977865A | ||||
| JP4611242B1 |
Attorney, Agent or Firm:
Yasuo Ishikawa
Previous Patent: SURFACE-SIZING COMPOSITION FOR PAPER MAKING
Next Patent: SPEED CHANGE OPERATING DEVICE
Next Patent: SPEED CHANGE OPERATING DEVICE