PLATE THICKNESS CONTROL METHOD AND PLATE THICKNESS CONTROL STATE JUDGMENT DEVICE

WIPO Patent Application WO/2011/070702

A1

Provided is a plate thickness control method for controlling, in a rolling mill for rolling a plate to obtain a target plate thickness, a plate thickness by determining an estimated plate thickness deviation from the following expression (1): ∆he(t) = ∆S(t)+G×∆P(t)/Kc (1), in which Kc, t, ∆P(t), ∆S(t), and ∆he(t) (A) represent the rigidity of the rolling mill used for the control, a period of time, and the deviation of a rolling weight, the deviation of a roll gap of the rolling mill, and the estimated plate thickness deviation from a standard state, respectively, and G represents a constant value that satisfies 0