Method of controlling flow in casting mold by using dc...

B - Operations – Transporting – 22 – D

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B22D 11/18 (2006.01) B22D 11/10 (2006.01) B22D 11/115 (2006.01)

Patent

CA 2163998

The present invention provides a method, for regulating the flow of a molten steel within a mold by taking advantage of a direct current magnetic field, comprising the step of carrying out continuous casting while regulating the flow of a molten steel, delivered through a nozzle, by applying a direct current magnetic field having a substantially uniform magnetic flux distribution over the whole width direction of the mold, characterized in that the flow velocity of a meniscus on the surface of the molten steel within the mold is regulated in a range of from 0.20 to 0.40 m/sec by regulating the molten steel delivery angle of the nozzle, the position of the magnetic field, and the magnetic flux density. When the flow velocity of the meniscus is greatly increased, a stream of the molten steel delivered through the nozzle is allowed to collide directly with a short-side wall of the mold and, thereafter, the flow velocity is regulated according to the following equation (1), while, when the flow velocity of the meniscus is increased or decreased, a stream of the molten steel delivered through the nozzle is allowed to traverse a magnetic filed zone and then to collide with a short-side wall of the mold and, thereafter, the flow velocity is regulated according to the following equation (2) V p/V o = 1 + .alpha.1{1-exp(-.beta.1.H2)} ... (1) V p/V o = 1 + .alpha.2{sin(.beta.2.H)exp(-r.H)} ... (2) wherein H = 185.8.B2.D.T/(D+T)V.

Un procédé permet de commander un flux dans un moule de coulée placé dans un champ magnétique CC. La coulée de l'acier fondu est continue depuis un ajutage et elle est commandée par application au moule, dans le sens de son épaisseur, d'un champ magnétique CC à répartition de densité de flux magnétique pratiquement uniforme sur toute la largeur de ce moule. Ce procédé se caractérise en ce que la vitesse d'écoulement obtenue à la surface du bain d'acier fondu présent dans ce moule est commandée, dans une fourchette de 0,2 à 0,4 m/sec, par modulation de l'angle d'éjection de l'ajutage, de la position du champ magnétique et la densité de flux magnétique. Quand la vitesse d'écoulement de surface du bain augmente fortement, on effectue une opération de commande, selon l'équation (1): Vp/Vo = 1 + alpha 1{1-exp( beta 1.H<2>)}, pour projeter le flux provenant de l'ajutage directement sur une plus petite paroi du moule, et, quand cette vitesse d'écoulement de surface de bain augmente on diminue, on effectue une opération de commande, selon l'équation (2): Vp/Vo = 1 + alpha 2{sin( beta 2.H)exp(- gamma .H)}, pour projeter le flux provenant de l'ajutage sur une plus petite paroi du moule après l'avoir fait passer par une zone du champ magnétique dans ces équations, H = 185,8.B<2>.D.T/(D+T)V.

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