Adjusting the mode of electromagnetic stirring over the...

B - Operations – Transporting – 22 – D

Patent

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B22D 11/18 (2006.01)

Patent

CA 2627680

In a continuous casting mould for casting flat metal products, having a submerged nozzle with lateral discharge outlets, the mould being equipped on each of its large faces (3) with a pair of linear inductors generating a travelling magnetic field that travels horizontally over the width of said large face and placed on either side of the casting nozzle (5), this method of adjusting the stirring mode is characterized in that, since the inductors (10a to 11b) are mounted in pairs sliding vertically over the height of the mould, the casting process passes, by translational movement of said inductors, from a low stirring action position LS for assisting the incoming liquid metal jets, said position being located level with the discharge outlets (17) of the nozzle, to a high stirring action position HS for making the cast liquid metal rotate about the casting axis, said position being located level with the meniscus (9) of the liquid metal in the mould, and vice versa, and in that, upon passing from one position to the other, the connection of the inductors to the phases of the power supply (7) is modified so as to reverse the direction of travel of the magnetic field of only one of the two conductors of any one pair, and also that, among the two inductors of the other pair, which is symmetrical with respect to the casting axis.

Dans une lingotière de coulée continue de produits métalliques plats à busette immergée à ouïes de sortie latérales, lingotière équipée sur chacune de ses grandes faces (3) d'une paire d'inducteurs linéaires à champ magnétique glissant horizontalement selon la largeur de ladite grande face et disposés de part et d'autre de la busette de coulée (5), cette méthode de réglage du mode de brassage se caractérise - en ce que, les inducteurs (10a à 11b) étant montés par paire coulissant verticalement selon la hauteur de la lingotière, on passe, par translation desdits inducteurs, d'une position d'action de brassage basse PB d'assistance aux jets de métal liquide arrivant, située au niveau des ouïes (17) de sortie de la busette, à une position d'action de brassage haute PH de mise en rotation du métal liquide coulé autour de l'axe de coulée, située au niveau du ménisque (9) du métal liquide en lingotière, et réciproquement; - et en ce que, lors du passage d'une position à l'autre, on modifie la connexion des inducteurs aux phases de l'alimentation électrique (7) afin d'inverser le sens de glissement du champ magnétique de l'un seulement des deux inducteurs d'une même paire ainsi que de celui, parmi les deux inducteurs de l'autre paire, qui est son symétrique par rapport à l'axe de coulée.

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