Method for increasing the process stability, particularly...

Details Method for increasing the process stability, particularly... Method for increasing the process stability, particularly...

B - Operations, Transporting

21

B

B21B 37/00 (2006.01) B21B 37/16 (2006.01)

Patent

CA 2554131

The invention relates to a method for increasing the process stability, particularly the absolute thickness precision and the installation safety during the hot rolling of steel or nonferrous materials, with small degrees of deformation (f) or no reductions while taking the high-temperature limit of elasticity (Re) into account when calculating the set rolling force (FW) and the respective setting position (s). The process stability can be increased with regard to the precision of the yield stress (kf,R) and the set rolling force (FW) at small degrees of deformation (f) or small reductions, during which the high-temperature limit of elasticity (Re) is determined according to the deformation temperature (T) and/or the deformation speed (phip) and is integrated into the function of the yield stress (kf) for determining the set rolling force (FW) via the relation (2) ) Re= a + e b1+ b2 .bullet. T. phipC , in which: Re represents the high-temperature limit of elasticity; T represents the deformation temperature; phip represents the deformation speed, and; a, b, c represent coefficients.

L'invention concerne un procédé pour augmenter la stabilité au traitement, notamment la précision d'épaisseur absolue et la sécurité d'installation, lors du laminage à chaud de matériaux en acier ou en métal non ferreux, avec de faibles taux de déformation (.phi.) ou de faibles pertes, en tenant compte de la limite élastique à chaud (R¿e?) lors du calcul de la force de laminage nominale (F¿w?) et de la position de réglage (s) correspondante. L'invention vise à augmenter la précision de la contrainte d'écoulement (k¿f,R?) et de la force de laminage nominale (F¿w?) pour de faibles taux de déformation (.phi.) ou de faibles pertes. A cet effet, la limite élastique à chaud (R¿e?) est déterminée en fonction de la température de formage (T) et/ou de la vitesse de formage (phip), et elle est intégrée dans la fonction de contrainte d'écoulement (k¿f?) pour déterminer la force de laminage nominale (F¿w?) par le rapport suivant : (2) ) R¿e?= a + e ?b1+ b2 .bullet. T¿. phip?C¿, sachant que R¿e? = limite élastique à chaud, T = température de formage, phip = vitesse de formage, a ; b ; c = coefficients.

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