COOLING METHOD OF ROLL FOR PRODUCTION OF QUICKLY COOLED LIGHT-GAGE STRIP

摘要

PURPOSE:To decrease the thermal crown of a cooling roll and make the thickness in transverse and longitudinal directions of a light-gage strip uniform by supplying the cooling liquid to be introduced into the parts of the roll in and without contact with molten metal through separate systems and providing a temp. difference. CONSTITUTION:The cooling liquid to be introduced into a cooling roll 1 is supplied in separate systems for the part 1a into contact with molten metal 8 and the part 1b without contact therewith. The temp. of the cooling liquid to be introduced into the part 1b is made higher than the temp. of the cooling liquid to be introduced into the part 1a to provide at least 100 deg.C temp. difference. The rates of thermal expansion of the parts 1a and 1b of the roll 1 are respectively detected and the flow rate of the low temp. cooling liquid or high temp. cooling liquid is adequately changed according to the detected values thereof, whereby the thermal crown of the roll 1 is controlled.