| 摘要 |
<p>PURPOSE:To prevent generation of shape defects such as center elongation or complex elongation in a continuously changed rolling from a narrow stock to a wider stock by cooling a part of a roll corresponding to a stock width (a part inside the sheet path) to reduce a thermal crown during narrow stock rolling. CONSTITUTION:Each of control valves 28 is set for each of nozzles 26 in a coolant supply device 21. A thermal crown is reduced by increased cooling of only the part inside the sheet path of a work roll 6. During rolling a narrow stock, that is, before changing a sheet width from a narrow width to a larger one, a supply amount of the coolant to the nozzles 26 is controlled so that a cooling intencity for the inside part is increased stronger than that for other parts than the sheet path to reduce a thermal crown. Thus, generation of unusual center elongation or complex elongation in the case of changing stocks from a narrow stock to a wider one is prevented.</p> |
