PURPOSE: To surely prevent the tip camber from being generated by obtaining controlled variable with high accuracy in a method to control camber at the tip part of a rolled stock generated when a thick plate is rolled.
CONSTITUTION: In rolling of a final pass, the target difference between upper and lower surface temperatures necessary to prevent the tip of the rolled stock 13 from cambering is calculated based on the difference between the feed speed of the rolled stock 13 by a table roller and the biting speed by a work roll, the amount of camber and the shape of camber at the tip of the rolled stock 13 in the preceding two passes to the last rolling stage the plate thickness on the inlet side of the rolled stock and a draft by the rolling mill, a water cooling condition necessary to give the target difference between the upper and lower surface temperatures to the rolled stock is calculated, then, the final rolling is carried out after the lower surface of the tip part of the rolled stock 13 is cooled by water based on the water cooling condition.
OE KENICHI
UEDA HIROTSUGU
