| 摘要 |
PROBLEM TO BE SOLVED: To provide a plate thickness control method capable of improving plate thickness accuracy, by properly restraining hunting in an absolute value AGC.SOLUTION: A plate thickness control method of the present invention controls roll opening between a pair of work rolls for rolling a rolling material by a plate thickness control device based on the absolute value AGC which is provided with a limiter for setting a plate thickness deviation being a difference between a target value and an outlet side plate thickness by a calculation within a predetermined range. Such a plate thickness control method includes: a step of starting plate thickness control by the absolute value AGC when the rolling material bites in between the work rolls; a step of subtracting the plate thickness deviation in lock-on time from the plate thickness deviation inputted to the limiter thereafter by locking on the plate thickness deviation inputted to the limiter when the plate thickness control of a tip part of the rolling material finishes; and a step of inserting a roll opening correction quantity between the work rolls calculated based on the plate thickness deviation outputted from the limiter from a lock-on circuit by storing the quantity in the lock-om time. |
