Method for rolling a metal strip with adjustment of the side...

B - Operations – Transporting – 21 – B

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B21B 37/68 (2006.01)

Patent

CA 2690096

The invention relates to a method for rolling a strip (B) inside a rolling mill for metal products that comprises at least two cages in which the strip (B) is simultaneously clamped, said method comprising: adjusting the side position of said strip (B) by simultaneously determining, downstream from each of the rolling mill in which the strip is clamped, a value representative of its side position along a line transverse to the movement direction, and calculating the algebraic deviations (?xp) between the side positions and the reference positions (6); based on said deviations (?xp), calculating the value (Sp) of the additional tilting to be applied to each of the rolling mill cages in which said strip (B) is clamped in order to reduce said algebraic deviations (?xp) under a predetermined threshold, the calculation of said additional tilting values (Sp) being carried out by multiplying said deviation values (?xp) by a K gain matrix determined by modelling the relations binding said deviation values (?xp) of the strip and said tiltings (Sp) of the support cylinders of the rolling mill; transmitting to each of the rolling mill cages the respective setpoint of additional tilting (Sp); and repeating these operations at predetermined time intervals until the strip (B) is no longer clamped in the last cage of the rolling mill. The invention also relates to a device for implementing this method, and to a rolling mill provided with at least one such device.

L'invention a pour objet un procédé de laminage d'une bande (B) à l'intérieur d'un laminoir de produits métalliques comportant au moins deux cages dans lesquelles la bande (B) est simultanément sous emprise, selon lequel on régule, la position latérale de ladite bande (B), en déterminant simultanément, en aval de chacune des cages du laminoir dans lesquelles la bande (B) est en emprise, une valeur représentative de sa position latérale selon une ligne transversale à sa direction de déplacement, et on calcule les écarts algébriques (.DELTA.xp) entre les positions latérales et une position de référence (6); puis à partir de ces écarts (.DELTA.xp), on calcule la valeur (Sp) du déhanchement additionnel à imposer à chacune desdites cages du laminoir dans lesquelles ladite bande (B) est en emprise, afin de ramener lesdits écarts algébriques (.DELTA.xp) en dessous d'un seuil prédéterminé, le calcul desdites valeurs (Sp) de déhanchements additionnels étant effectué en multipliant lesdites valeurs d'écarts (.DELTA.xp) par une matrice de gain K déterminée par modélisation des relations liant lesdites valeurs d'écarts (.DELTA.xp) de la bande et lesdits déhanchements (Sp) des cylindres de soutien du laminoir; on transmet à chacune des cages de laminoir la consigne de déhanchement additionnel (Sp) respective, et on renouvelle ces opérations à intervalles de temps prédéterminés, jusqu'à ce que ladite bande (B) ne soit plus sous l'emprise de la dernière cage dudit laminoir. L'invention a également pour objet un dispositif pour la mise en uvre de ce procédé, et un laminoir équipé d'au moins un tel dispositif.

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