| 摘要 |
<p>PURPOSE:To shift a roll in a short time by obtaining previously an allowable rolling reduction force for shifting the roll without causing flaws between rolls and a draft position of roll, and shifting the roll by changing the draft position of roll to the position obtained previously at the time of idle rolling. CONSTITUTION:An allowable shifting pressure capable of shifting the work rolls 1, 2 of a four high mill without causing the flaws of rolls is previously obtained to change the draft position of the rolls 1, 2 with the aid of a rolling reduction device 5 by obtaining a draft position capable of shifting rolls at the time of idle rolling with the aid of an operator 6 and driving a servovalve 9 through a commanding part 7 and an adder 8. Further, the signal of operator 6 and the signals of the number of revolutions of rolls 1, 2 are inputted to an operator 11 to output a command of shifting speed thereby the rolls 1, 2 are shifted at this speed. Furthermore, after the shifting is completed, a signal of draft position for the next coil is fed from a commanding part 12 to change the draft position. In this way, the roll shifting is performed in a short time, and the lowering of operating efficiency is eliminated.</p> |
