| 摘要 |
<p>PURPOSE:To control accurately the wall thickness of titled pipe by providing electromagnetic-ultrasonic wall thickness gauges to the inlet and outlet sides of a rolling mill and controlling a roll opening and a plug position by said gauge of inlet side and correctingly controlling them by the gauge of outlet side. CONSTITUTION:A wall-thickness controlling-quantity arithmetic device 7 compares a set wall-thickness value tS1 with the output signal value t1 of an inlet- side wall thickness gauge 9 to output a signal corresponding to the deviation value DELTAt1 obtained by said comparison. A roll-gap control device 4 and a plug- position control device 5 control a roll opening E and a plug-3-position respectively. In the same manner, an arithmetic device 8 of wall-thickness control quantity of outlet side, outputs the deviation value DELTAt2 of the wall thickness t2 of outlet side. The devices 4 and 5 correct the roll gap E and the plug position respectively based on the signal of deviation value DELTAt2. Because of the extremely high accuracies of electromagnetic-ultrasonic type wall-thickness gauges 9, 10, the wall thickness is controlled highly accurately.</p> |
