| 摘要 |
PROBLEM TO BE SOLVED: To prevent the development of tear-off and breakout caused by a hot-band of a cast strip by sensing the development of the hot band from the variation of reaction of rolls or gap of the rolls, fastening the roll gap just after passing the roll reaction through the max. value, keeping the suitable roll reduction and executing the casting. SOLUTION: Signal of the roll reaction with a reaction detector 1 is compared with the reaction target value with a reaction control device 2 and a hydraulic servo valve 3 is controlled with the signal according to a difference and a rolling reduction position is controlled so that the roll reaction becomes the target reaction with a hydraulic cylinder 4. Further, a signal of the roll position with a positional detector 5 is compared with the drum gap target value through a rolling reduction control unit 6 and the drum position is controlled so as to become the target gap by controlling a motor M through a roll speed control unit 7 with the signal according to the difference to obtain the cast strip having a prescribed strip thickness.
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