| 摘要 |
PURPOSE:To enable roll exchanging while making operation by determining the front tension and rear tension of a stand to be exchanged of rolls as the average value of the front tension and rear tension just before the roll exchanging and restoring gradually the rear tension to the state in the ordinary operation. CONSTITUTION:Control devices 4B-4D for roll speed are operated in such a way that the rear tension and front tension on a strip 11 passing a stand provided with work rolls 1C attains the value obtd. by averaging said rear tension and front tension in the case of exchanging the rolls 1C. A rolling down control device 9C is operated in this state to release the rolling reduction of the rolls 1C and the rolls 1C are exchanged with new rolls. A rolling down force is then applied on the rolls by the device 9C and the devices 4B-4D are operated to restore the front tension and rear tension to be applied on the strip to the state before the roll exchange, whereby the control for restoring the ordinary rolling state is performed. |
