| 摘要 |
PROBLEM TO BE SOLVED: To make a material characteristic of a steel plate to be rolled, in a longitudinal direction even.SOLUTION: A cooling water amount preset part 11 estimates steel plate temperature on an outlet side of a hot rolling finish mill 51 based on preset rolling speed, a cooling water amount from cooling devices 54-58 between a stand table, and steel plate temperature on an inlet side of the hot rolling finish mill 51, before rolling of the steel plate 53, then presets the cooling water amount from the cooling devices 54-58 between the stand table, so that the steel plate temperature on the outlet side matches the predetermined target temperature. A target temperature correction amount calculation part 31 calculates a correction amount of target temperature for reducing an affection which a change amount of the rolling speed in which the rolling speed during rolling is changed from the preset rolling speed affects to the material characteristic value of the steel plate 53. A cooling water amount instruction part 35 calculates a change amount of the cooling water amount according to the correction amount of the target temperature on the outlet side of the steel plate 53, and corrects the cooling water amount which is preset by the cooling water amount preset part 11 with the change amount of the cooling water amount, and then outputs the corrected cooling water amount to the cooling devices 54-58 between the stand table.SELECTED DRAWING: Figure 1 |
