METHOD FOR CONTROLLING PLATE THICKNESS IN ROLLING MILL

PURPOSE:To improve yield and to reduce rolling trouble by improving the thickness accuracy especially in the tip part of a metal plate in a method for controlling the thickness of a material to be rolled by automatically setting the screw-down position of a rolling mill before rolling the metal plate. CONSTITUTION:In the method that the screw-down position of the rolling mill is determind from a rolling load and the target thickness that are beforehand determined before rolling the metal plate using a roll-gap calculating formula and automatically set, correction terms of the roll-gap calculating formula that the wear and thermal expansion of the roll of the rolling mill are taken into consideration are taken as the sum of a value that the roll wear and thermal crown of two diameters are multiplied by a correction factor (a) of less than 1.0 and the amount of parallel expansion of two diameters.