| 摘要 |
<p>PURPOSE:To make control practicable even if the time lag of a screw-down system is large by determining the controlled variable to be applied to the screw-down device in order to perform titled control of a tandem rolling device in accordance with the sum of the difference between the right and left rolling loads of the fore stage stand and the differentiated value thereof. CONSTITUTION:There is no output from an adder 13 if a strip S travels normally and a difference between rolling loads p=0. However, when the tailing-through of the strip S arises in the i-2 stand, the strip S begins to snake in the i-1 stand and a difference (p) (+ and - polarities on the operating and driving sides of the stand) in the size corresponding to the rate of snaking arises. Such difference is detected with a calculator 11 and at the same time the fluctuation of the difference (p) per unit time is detected with a mechanical differentiator 12. The added output converted to a position signal with a coefft. device 14 is collated respectively with screw down positions Xr, Xl by calculators 15R, 15L and commands Mr, Ml for the screw down positions are emitted from the respective calculators. A servocontrol valve 16R (same with 16L) controls the amt. of the oil in a screw-down cylinder 4R and the direction thereof according to the command Mr so that the difference between said command and the output Xr from a position detector 4R is made zero.</p> |
