| 摘要 |
<p>PURPOSE:To control finely a thermal crown and to improve the quality of a rolling material by providing also a feeding system of high coolability coolant to the outlet side of a rolling mill and operating a spraying pattern of each coolant-spraying nozzle, located each at the inlet side and outlet one, as the inclination of the distribution of elongation percentage in the width direction of a strip, and cooling work rolls basing on the operated values. CONSTITUTION:A nozzle 20(m) for spraying a high coolability coolant is provided to the outlet side of a mill 1 in the same manner as a nozzle 5(n) for spraying a low coolability coolant provided to the inlet side. And a shape signal EX of an elongation percentage in the width direction of the strip S is obtained by a shape detector 40 of the strip S, and the inclination in the width direction of a crest part generated in the strip S is decided by the signal EX and a set signal. Then a thermal crown is controlled by supplying the coolant to the lower roll 1 after allotting the nozzle 5(n) of the inlet side to a small inclination part of the lower roll 1 and the nozzle 20(m) of the outlet side to a large inclination part.</p> |
