| 摘要 |
<p>PURPOSE:To lower a rolling load and to improve rolling efficiency by detecting the temperature of a strip metal during rolling and controlling the flow rate of coolant or a rolling speed so that the temperature of this strip metal is as high as possible within a range not exceeding the target value. CONSTITUTION:The plate temperature in that pass is detected directly by a thermometer and, when the temperature is lower than the maximum value of the plate temperature obtained from the deformation previously, the amount of coolant is controlled or the rolling speed is increased when the other condition (whether there is a possibility of a bad form, plate braking and the like) is permitted. On the contrary, when the plate temperature is higher than the maximum value of the plate temperature obtained previously, the amount of coolant is increased or the rolling speed is controlled. In this way, since the rolling is always carried out in the optimum condition in the maximum value of the plate temperature and the rolling reduction by one pass can be increased, the number of rolling passes decreases and the rolling efficiency is improved. Further, the amount of thermal crowm is fixed and the surface property of the steel strip is stabilized as well.</p> |
