CONTROL METHOD OF LOOPER OF HOT CONTINUOUS ROLLING MILL

摘要

PURPOSE:To improve the control accuracy of a looper by selecting a pattern in accordance with the natural frequency and absolute value of oscillating quantity of measured values which are obtained by picture processing and correcting a prescribed control gain automatically with correction coefficient corresponding the selected pattern. CONSTITUTION:In accordance with the deviation from reference set value of the measured angle of the looper 4 and measured tension of a material 3 to be rolled, the angle of the looper 4 and the tension of the material 3 to be rolled are controlled based on the prescribed control again. Then, the pattern in accordance with the natural frequency and absolute value of oscillating quantity of the measured value which are obtained with a picture processor 13 is selected. The prescribed control gain is automatically corrected with the correction coefficient corresponding to the selected pattern by using a controller 11 for looper control system. In this way, the stability of rolling operation can be ensured.