PURPOSE: A compensating method of a roll gap is provided to improve the response property by quickly recalculating predicting errors per pass. CONSTITUTION: A correlation between a measured value of a roll gap and a measured value of a roll load is calculated from accumulated roll data. A mill modulus is calculated with the correlation. The roll gap is calculated with the mill modulus. A rolling is performed with the roll gap value. The roll gap and the measured value of the roll load are accumulated. Predicting errors of the roll gap are reduced by repeating the operations. Thereby, a deviation of thickness is reduced.
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