| 摘要 |
PURPOSE: A method for rolling plates is provided which greatly increases the thickness accuracy of plates material by setting roll gaps considering variation of the roll gaps according to variation of bending forces of rolls in a mill at which a roll bender is installed. CONSTITUTION: The method for rolling a plate(1) using a mill equipped with a roll bender comprises the steps of determining a standard balance pressure for closely adhering an upper work roll(2a) to an upper support roll(3a); obtaining rolling loads according to roll bending forces as changing the roll bending forces after descending the upper work roll so that the upper work roll(2a) is contacted with a lower work roll(2b), and obtaining rolling load differences by comparing the rolling loads according to roll bending forces with the standard balance pressure; obtaining correlation for differences between each roll bending forces and rolling loads; determining rolling loads per each passes from rolling information on a plate to be rolled, and setting a target sheet crown for the plate to be rolled; obtaining an actually applicable roll bending force corresponding to the set target sheet crown; obtaining changes of roll gaps according to the obtained actually applicable roll bending force; obtaining set values of the roll gaps from the changes of the roll gaps; and rolling the plate(1) so as to satisfy the obtained set values of the roll gaps.
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