| 摘要 |
<p>PURPOSE: To secure improved flatness by operating a cooling device, on the basis of low temperature data from a thermometer at both ends in the width direction and the elongation data from a shape meter at a central part in the width direction, and thereby cooling the central part in the width direction of a plate after rolling. CONSTITUTION: The method is provided, from the upstream side on the line of exit side of a hot rolling mill 1, with a plate thermometer 3 for measuring the surface temp. of a plate from above a roller table 2, a shape meter 4 for discriminating a plate shape in the width direction and a hot straightening machine 11 for hot- straightening a plate. Additionally, a plate thermometer 5 is provided by which the surface temp. is measured from above the roller table 2 on a plate immediately before cooling; and behind it, a plate cooling device 8 attached with a flowing water shielding plate for regulating water flowing to the ends of the plate in the width direction is arranged in the upper and the lower side of the roller table. The cooling device 8 is operated on the basis of low temperature data from a thermometer at both ends in the width direction and the elongation data from a shape meter at a center part in the width direction, cooling the central part in the width direction of the plate after rolling; and thus an improved flatness can be obtained.</p> |
