Rolling control method and device

Abstract

The present invention provides a method and an apparatus for controlling a rolling operation, which method and apparatus can carry out a highly accurate control of the edge drop while suppressing surface defects caused by a roll shift. In a six-high rolling mill, the highly accurate control of the edge drop is carried out by combining a working roll shift and an intermediate roll shift. In addition, a shift oscillation and the control of the edge drop by shifting the intermediate roll are carried out during the rolling operation of the working roll. Further, when the amount of the edge drop cannot be fully controlled by the control of the edge drop by shifting the intermediate roll, the control of the edge drop is carried out by shifting the working roll. By this method, the deviation of the edge drop can be controlled to a minimum while suppressing the generation of the defects on the surface of a strip to be rolled as much as possible.

Description

technical field [0001] The invention relates to a rolling control method and a rolling control device. Background technique [0002] In rolling control, the thickness accuracy of the rolled material in the width direction is strictly required. In particular, thickness accuracy near the end of the material to be rolled is a problem. For this reason, work rolls with inclined front ends are used and a technique of moving the work rolls in the axial direction is used. This technique is disclosed in, for example, JP-A-60-12213. [0003] When the work roll whose tip is inclined is moved, uneven wear of the work roll occurs at the starting point of the inclined portion. In order to suppress such partial wear, a technique of stepwise moving the work roll (oscillating movement) is employed. Such a technique is disclosed in Japanese Unexamined Patent Publication No. 62-151203, for example. [0004] In addition, it is conceivable to improve the thickness accuracy of the width direc...

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Problems solved by technology

[0005] If the work rolls are moved in stages, the partial wear of the work rolls can be suppressed, but there is a problem that the thickness of the rolled material near the end of the material changes greatly during the movement.

[0006] In addition, if the intermediate roll is moved, it can relatively cope with the case where the unevenness of the plate thickness near the edge of the material to be rolled is small, but there is a problem that it cannot be maintained when the unevenness increases for some reason. High-accuracy plate thickness near the end

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