| 摘要 |
<p>PURPOSE:To control the sheet thickness of a material to a prescribed thickness by obtaining the wave form of a backup-roll eccentricity and controlling a roll gap basing on the weighted average of said wave form and a wave form obtained at the time of a mutual contact of work rolls. CONSTITUTION:A control error produced during one revolution of an upper backup roll is inputted from a load cell 9 as the variation of a rolling down force, together with a rotating angle of upper backup roll that is an output of counter 17, to a digital computor 14. The control error that is the variation portion of a wave form of roll eccentricity is used as the function of a rotating angle of upper backup roll, to obtain its wave form. A roll-eccentricity control output is outputted from the computor 14 to a hydraulic rolling-reduction control board 10 during the next one revolution of the upper backup roll, to prevent the roll eccentricity from converting into the sheet thickness variation. The roll-eccentricity control output is obtained from the variation portion of the wave form of roll eccentricity obtained from the control error during said one revolution, to perform successively the control at the next time of rotation basing on said output. The same control is thereafter performed in sequence. In this way, the sheet thickness is controlled so as to accurately conform it to the prescribed value.</p> |
