Method and computer program for controlling a rolling process

Details Method and computer program for controlling a rolling process Method and computer program for controlling a rolling process

B - Operations, Transporting

21

B

B21B 37/00 (2006.01)

Patent

CA 2594794

The invention relates to a method for controlling a rolling process, in which a metal strip is rolled flat by use of at least one roller. It is known from the prior art that the relative position of a neutral point represents a measure of the instantaneous stability of a rolling process. However, traditional methods for calculating the position of the neutral point do not accurately represent the actual properties of metal and therefore have only limited usefulness for predicting the stability of a rolling process. In order to allow better control of a rolling process for rolling a metal strip with regard to the actual behavior of the metal strip, the invention proposes a new method for calculating the relative position of the neutral point, in which in particular the flat yield stress k e and the hydrostatic pressure p N H at the neutral point are incorporated.

L'invention concerne un procédé de commande d'une opération de laminage dans laquelle un feuillard métallique est laminé à plat à l'aide d'au moins un cylindre. Par l'état de la technique, on sait que la position relative d'un point dit neutre constitue une mesure de la stabilité effective d'une opération de laminage. Les procédés classiques de calcul de la position du point neutre ne représentent cependant que de manière assez imprécise les propriétés réelles du métal et ne conviennent donc que de manière limitée pour tirer des conclusions sur la stabilité d'une opération de laminage. Pour pouvoir mieux commander une opération de laminage d'un feuillard métallique en fonction du comportement réel du feuillard métallique, on propose un nouveau procédé de calcul de la position relative du point neutre qui tient compte en particulier de la contrainte d'écoulement ke dans le plan et de la pression hydrostatique pN H au point neutre.

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