earticle

영어

Because of the roll eccentricity in backup rolls, the exit thickness deviates periodically. Each strip thickness defect on exit is related to a roll of the finishing mills, allowing the implementation of an optimal policy for the substitution and maintenance of the rolls, thereby maintaining the required quality level of the strip. This policy allows the minimization of roll changes and the concentration of several changes at the same time, reducing production costs. Roll eccentricity is one of the most important factors which affect the thickness quality of rolled strips and, consequently, any action directed to removing roll eccentricity or its effects will greatly improve thickness quality and reduce production costs. In this paper, roll eccentricity signal is identified by cooperation of quadrature detector and robust tracking differentiator, which are adopted by compensation loop. The identification and compensation part of the loop are combined, and the rolling process knowledge as well as the need of additional sensors for a good compensation is minimised. The algorithm is proved applicable to eccentricity compensation of modern rolling mill by simulation and field experiment, and can improve the thickness quality.