0PTIMISATION DU TAUX DE CICATRISATION EN LINGOTIÈRE AU COURS DE LA COULÉE CONTINUE D’ACIER

Abstract

During the continuous casting of steel, the solidification phase in the ingot mold is very important, and it is governed by three main factors that are thermal transfer, ingot mold oscillation and lubrication. So the control of these parameters helps prevent appearance of cracks that can cause a breakthrough. In fact, during his runs through in the ingot mold which oscillates the solidified steel is in compression, creating a sliding the slipping time (time for healing) is estimated based on two factors are the casting speed and the oscillation of the ingot mold, in the namely frequency and amplitude. The interest of this work is optimizing the healing rate which represents the ratio of healing time of the total cycle time. During the time, the solidified steel is in compression, thereby reducing the risk of bonding of the metal on the ingot mold wall closing and tearing of the solid skin. By using experience of "Box-Behnken" plans was a relation drawn between the following parameters: the casting speed "v" amplitude "a" to ingot mold oscillation and frequency "n "and the rates of healing" τ ". Using a Matlab program, an optimal diet casting predicting a "τ" max , for the avoid a breakthrough during the solidification process in ingot mold