| 摘要 |
PURPOSE: A cold rolling mill and a rolling method which rolls strips of an even thickness in the cold state, controlling the thermal crowns during rolling without causing any flaws in the rolled surfaces and with quick responses to ever-changing thermal crowns are provided. CONSTITUTION: The cold rolling mill of at least four-high or more-than-4-high comprises first shifting equipment(12,13) which can shift a pair of upper and lower working rolls(2) in opposite directions and roll bending equipment which controls the bending of said pair of working rolls, wherein said cold rolling mill further comprises locally gradually-thickened-toward-end parts(2a) provided on said working rolls(2) at one ends thereof so as to be symmetrical with respect to a point, a first shape control means for controlling a thermal crown formed on each of said pair of working rolls together with said locally gradually-thickened-toward-end parts, and a second shape control means for controlling to form a concave crown in the center of said rolled material. The rolling method which comprises the steps of using shape detectors which measure the shapes of a sheet at least after being rolled and a 4-high or more-high cold rolling mill which comprises shifting equipment which can shift one pair of upper and lower working rolls each of which has a locally gradually-thickened-toward-end part on one end of respective working rolls with the locally gradually-thickened-toward-end parts disposed vertically symmetrically with respect to a point, roll bending equipment which controls bending of said pair of working rolls and has, as a first shape control means, decremental bending equipment which works to narrow the gap between said pair of working rolls, and a second shape control means for forming a concave crown in the center of said rolled material; adjusting the position of said one pair of upper and lower working rolls by said shifting equipment so that side edges of the rolled sheet may be limited by said gradually-thickened-toward-end parts of said working rolls before starting rolling; approximately fixing the shift position of said pair of upper and lower working rolls while rolling is in progress; and determining the operations of said first and second shape control means so that their effects on the sheet may work reversely according to the output of said shape detectors.
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