Continouos casting installation for the electromagnetic...

B - Operations – Transporting – 22 – D

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B22D 41/62 (2006.01)

Patent

CA 2529384

The invention relates to a continuous casting installation for metals, particularly steel, in which the submerged nozzle (8) is surrounded by an annular electromagnetic inductor (1) with a magnetic field that rotates around the casting axis, which is intended to drive the molten metal in axial rotation therewith. The invention is characterised in that the aforementioned inductor is of the polyphase type with a magnetic field passing therethrough and is equipped with a pair of projecting poles (3) per phase. Moreover, the end of each projecting pole opposite the nozzle is provided with a lateral narrowing (12) which increases the distance separating the polar ends (4). In this way, the inductor is extremely compact and very powerful and can deliver an intense traversing field into the central part of the nozzle, using a high-frequency primary current, such as to produce the effective rotation of the molten metal moving therein. The invention is particularly suitable for the continuous casting of slabs, using a submerged nozzle with lateral outlets.

L'installation de coulée continue des métaux, de l'acier en particulier, dans laquelle la busette immergée (8) est entourée par un inducteur électromagnétique annulaire (1) à champ magnétique tournant autour de l'axe de coulée destiné à entraîner en rotation axiale avec lui le métal en fusion, se caractérise en ce que, cet inducteur étant de type polyphasé à champ magnétique traversant, pourvu d'une paire de pôles saillants (3) par phase, chaque pôle saillant présente à son extrémité en regard de la busette un rétrécissement latéral (12) qui augmente la distance séparant les extrémités polaires (4) entre elles. On réalise ainsi un inducteur de grande compacité à forte puissance, délivrant un champ traversant intense jusque dans la partie centrale de la busette et ce avec un courant primaire à fréquence élevée de manière à obtenir une mise en rotation efficace du métal liquide en transit dans la busette. L'invention s'applique avantageusement à la coulée continue de brames mettant en oeuvre une busette immergée à ouïes de sorties latérales.

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