Board thickness controller for rolling machine

Abstract

A board thickness controller for a rolling machine which can fully reduce variation in board thickness arising from roll core eccentricity even in the event of deterioration over time of roll core eccentricity parameters or in any other cases. For such a purpose, the amount of roll core eccentricity is first determined from gauge meter board thickness and actual board thickness. Secondly, a curved surface corresponding to a distribution curve for the determined amount of roll core eccentricity is depicted to identify the curved surface using the Fourier analysis, thereby computing a phase and an amplitude of the roll core eccentricity for each of the upper and lower backup rolls. Subsequently, roll gaps are controlled in accordance with the computation result to reduce variation components in board thickness of an rolled material arising from the roll core eccentricity.

Description

technical field [0001] The present invention relates to a thickness control device for suppressing variation in thickness of a rolled material by controlling a roll gap in a rolling mill for rolling a rolled material with rollers arranged up and down. Background technique [0002] Sheet thickness control (AGC: Automatic Gage Control) has conventionally been applied when rolling a steel sheet or the like with a rolling mill. In this AGC, the thickness variation of the rolled material is detected (estimated) by some method, and the roll gap is controlled so that the thickness of the rolled material in the rolling direction is kept constant. In addition, when using AGC to detect thickness fluctuations, there is a method of estimating the thickness fluctuation during rolling from the rolling load, and estimating the thickness during rolling from the rolling load and the roll gap (thickness gauge thickness) The method, and the method of detecting plate thickness deviation with a...

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Problems solved by technology

However, the rotation angle at which roll eccentricity occurs and the amount of eccentricity sometimes change as rolling progresses.

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