Cold-rolling mill and its rolling method

Abstract

A 6-high rolling mill in accordance with the present invention wherein each of the working rolls 2 which are equipped with a shifting means has a locally gradually-thickened-toward-end part (or a local concave crown 2a) on one end of the roll, the working rolls 2 are disposed so that the locally gradually-thickened-toward-end parts of the working rolls 2 may be vertically symmetrically with a point, a decremental bender 10b which works to narrow the gap between the working rolls is provided as a first shape control means, both the local concave crowns 2a and the roll bender 10b are used to control thermal crowns, and an incremental bender 11a which controls bending of the intermediate rolls 3 is provided as a second shape control means which controls so that the center of a strip may have a concave crown.

Description

technical field

[0001] The present invention relates to a cold rolling mill and a rolling method thereof, more particularly, to a cold rolling mill of four or more rolls used in reversing cold rolling equipment, aluminum rolling equipment or copper rolling equipment and the use of the above Rolling method in cold rolling mill. Background technique

[0002] When rolling the steel strip, due to the temperature change along the axial direction of each work roll, the thermal expansion of the rolls is different, which will cause the diameter of the roll to change along the width direction of the roll. This phenomenon is called thermal humping (or humping). In other words, this is due to the fact that the heat generated during the rolling process and the friction between the roll and the strip to be rolled will cause the part of the roll in contact with the hot strip to be heated much more severely than other parts. When the above-mentioned amount of thermal swelling is large, th...

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