| 摘要 |
<p>PURPOSE:To make possible accurate position controlling of the neutral point in RD (Rolling Drawing) rolling by operating the measured pulses from a speed detector by the use of a speed ratio detector and controlling the speed ratio of work rolls. CONSTITUTION:When the entrance slde plate speed is detected with a speed detector 7, a speed ratio detector 22 detects the speed ratio of the peripheral speed of an upper work roll 4 and the entrance side plate speed. The speed difference thereof is converted to tension by an operator 23 and this tension is supplied to a tension control unit 19, by which the torque of an un-coiler 1 is corrected and the entrance side plate tension setting is corrected to make the speed difference zero. The speed ratio detection is accomplished by putting the signal of the speed detector 12 on the upper work roll 4 side into the first counter and putting the signal of the detector 7 on the deflector roll 6 side into the second counter then comparing these. When the numerical value of the first counter coincides with the numerical value based on the roll diameter ratio, putting in of the signals fron the detectors 7, 12 is inhibited and the measured value of the second counter is held.</p> |
