METHOD FOR LEVELING CAMBER OF THICK STEEL PLATE

摘要

PURPOSE:To level the flatness and the camber of a hot rolled thick steel plate at the same time by using a roll leveler independently adjustable from left and right draft positions and passing the plate by changing the left and right rolling reductions in accordance with the amount of camber of the plate. CONSTITUTION:A roll leveler to be used is constructed so that left and right draft positions are separately adjustable i.e. the left and right draft positions of an upper work roll 11 are independently adjusted by two sets of lifting motors 6, 7 acting on both ends of the roll 11. In the roll leveler, the difference between left and right rolling reduction for the detected amount of camber is obtained by detecting the bending direction and the amount of camber of a thick steel plate after hot rolling and basing on the relative value of the difference between the left and right rolling reductions and the correcting value of camber, obtained previously and separately for the sheet thickness and the sheet width. The plate is passed through rolls by adjusting the draft positions and the rolling reductions at the left and right sides in accordance with the difference in the rolling reductions.