EP0197482A2 - Apparatus for stirring molten metal in a continuous-casting machine - Google Patents

Apparatus for stirring molten metal in a continuous-casting machine Download PDF

Info

Publication number
EP0197482A2
EP0197482A2 EP86104374A EP86104374A EP0197482A2 EP 0197482 A2 EP0197482 A2 EP 0197482A2 EP 86104374 A EP86104374 A EP 86104374A EP 86104374 A EP86104374 A EP 86104374A EP 0197482 A2 EP0197482 A2 EP 0197482A2
Authority
EP
European Patent Office
Prior art keywords
branches
magnetic core
inductor
casting line
nozzle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86104374A
Other languages
German (de)
French (fr)
Other versions
EP0197482A3 (en
Inventor
Paul Metz
Paul Kirsch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0197482A2 publication Critical patent/EP0197482A2/en
Publication of EP0197482A3 publication Critical patent/EP0197482A3/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/62—Pouring-nozzles with stirring or vibrating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/122—Accessories for subsequent treating or working cast stock in situ using magnetic fields

Definitions

  • the present invention relates to a device for mixing molten metal in a continuous casting installation in which the molten metal flows in a controlled manner from a reservoir through a nozzle to an ingot mold, this device consisting of at least an electromagnetic inductor comprising a magnetic core and windings and designed to induce a rotational movement in the molten metal.
  • a device of this kind is known from document EP-A-0 093 068.
  • the electromagnetic stirring proposed by this patent has already proven itself and the essential advantages are that it is not only possible to free the nozzles in fouling gas. , but we can also prevent slag and inclusions from the metal bath from being sucked in by the vortices that form during continuous casting, especially when applying electromagnetic stirring in the mold or immediately below the ingot mold.
  • an inductor control system is used which is connected, on the one hand, to the system for controlling the flow rate of the supply of the liquid metal ingot mold, and, on the other hand, the metal level control system in the mold.
  • Document GB-A-2024679 describes another stirring device comprising one or more electromagnetic inductors which are mounted on movable sleepers and which allow the inductors to be withdrawn when it proves advantageous to carry out the casting without stirring.
  • this device does not have the efficiency and the yield of the powerful single-core inductor of document EP-A-0 093 068 which surrounds the molten metal and which is capable of inducing a rotating field in the metal.
  • the document GB-A-2006068 proposes a multipolar inductor comprising several poles extending perpendicularly from a core and which allows a casting line to be approached on one side despite the presence of advancement rollers which, in the operative position, are between the inductor mates.
  • this inductor can only exert a unilateral effect because it does not allow 360 ° access to the casting line.
  • the object of the present invention is to provide a new mixing device which combines the advantages of the known devices described above.
  • the present invention is essentially characterized in that the electromagnetic inductor is displaceable transversely relative to the metal casting line and in that its magnetic core consists of a single piece with several branches arranged around the casting line away from it and directed radially on the casting line.
  • the core comprises three branches each provided with an electromagnetic winding and which form between them angles of 120 °.
  • the inductor is. preferably arranged around the nozzle, but similar inductors can be arranged around the casting line in the secondary cooling zone.
  • the minimum distance between the branches of the inductor is greater than the outside diameter of the nozzle in order to allow engagement and withdrawal of the inductor.
  • one of the branches of the core can be connected to the rest of the latter by means of a hinge which allows the folding of this branch.
  • the three branches of the core can be arranged in a staircase around the nozzle, which causes a helical rotation in the molten metal.
  • each of these has on its inner face a short-circuit winding.
  • the core comprises only one electromagnetic winding and two branches, the ends of which are designed by means of an axial notch in the form of a fork with two teeth, and in which a tooth of a branch and the diametrically opposite tooth of the other branch has a short circuit winding.
  • the improvement to which the device proposed by the invention is subject compared with the state of the art lies in the fact that the inductor is no longer in contact with the nozzle or the casting line and that it can be removed if necessary.
  • the resulting advantage is that the electrical part of the inductor can be placed outside the hot zone, which simplifies its construction and eliminates or facilitates its cooling.
  • the inductor proposed by the invention does not hinder access to the nozzle and the ingot mold, which facilitates the control of the casting operation and the introduction into the ingot mold of metallurgical additives and additives. .
  • the core consists of a single piece whose branches are oriented radially on the casting line allows the creation of a very powerful rotary field.
  • the electromagnetic inductor proposed by the present invention comprises a magnetic core 14 with three branches 14a, 14b, 14c, having the general configuration of the letter E, the ends of the two outer branches 14b and 14c being bent in the direction of the middle branch of so that the axes of the three branches 14a, 14b, 14c have a common point or axis of intersection 0 opposite the middle branch 14a.
  • the three branches have, moreover, a symmetrical arrangement around the axis 0, that is to say form between them angles of 1200.
  • each of the branches 14a, 14b, 14c of the core are arranged respective electromagnetic windings 16, 18 and 20.
  • the inductor In the operative position, the inductor is arranged around the nozzle 10 in such a way that the axis O coincides with the central axis of the latter. However, in accordance with one of the features of the present invention, the inductor can be moved transversely relative to the nozzle 10, this mobility being symbolized by the arrow A.
  • the core 14 can, for this purpose, be mounted on a carriage mobile not shown.
  • the core 14 may be provided with a hinge 22 to separate one of the branches. exterior 14b or 14c. This hinge can be provided at the location indicated in Figure 1 to allow the folding of the branch 14b in the direction of arrow B, or in the region of the curvature of the branch 14b.
  • the proposed inductor operates like an electric motor, the three windings 16, 18 and 20 being connected to a three-phase alternating current, while the liquid metal column of the nozzle 10 acts as a rotor.
  • the frequency of the alternating current supplying the windings 16, 18 and 20 is normally that of the network. However, it is preferable to provide means allowing a reduction in the frequency, in particular when the product to be treated has a low magnetic permeability which is often the case when the stirring device is used in the secondary cooling zone.
  • a frequency greater than the frequency of the network may be used.
  • brewing is possible using a two-phase system, i.e. a magnetic core with two opposite branches.
  • branches 14a, 14b and 14c are arranged at the same level, that is to say that their axes are coplanar.
  • the branches 14a, 14b and 14c may in particular have a staircase-shaped arrangement around the nozzle 10, which allows the creation in the metal bath of a helical rotation movement.
  • an asymmetrical stirring with respect to the axis of the cast product, in particular in the secondary cooling zone.
  • This asymmetrical mixing can be obtained by placing the three branches at different distances from the axis of the casting line. It is also possible to provide different angles between the three branches of the core.
  • Figure 2 illustrates an example of such an embodiment.
  • the adjacent interior faces of the three branches 14a, 14b and 14c comprise turns or short-circuit windings 24.
  • Leakage currents being established perpendicularly between the branch 14a, on the one hand, and the branches 14b and 14c, on the other hand, generate in these windings 24 a current whose field opposes the leakage currents.
  • windings 24 by other suitable means such as for example low resistivity metal plates.
  • FIG. 3 shows an embodiment of an inductor designed for smaller installations or installations in which the space available for the inductor is reduced.
  • the inductor according to FIG. 3, which operates on single-phase current. Carries a magnetic core 26 with two branches 26a and 26b having the general configuration of the letter C, that is to say that the central branch of the mode is missing. of embodiment of FIG. 1.
  • This core 26 has only one electromagnetic winding and to allow it to generate, in monophase, a rotary field in the nozzle not shown, but located between the ends of the branches 26a and 26b, these are designed by means of an axial cut in the form of two teeth 26a ,, 26a 2 and 26b ,, 26b ,.
  • the diametrically opposite teeth in the example shown the teeth 26a 2 and 26b , are provided with short-circuit windings 30, 32.
  • the effect of these is that at the frequency of half a phase , the field lines are established alternately between the opposite teeth 26a 2 and 26b., on the one hand, and the opposite teeth 26a 1 and 26b, on the other hand, to generate a rotary field between the four teeth , that is to say in the casting line.
  • the distance between the teeth 26a and 26b 2 is also greater than the diameter of the nozzle or, if this design poses problems, one of the branches 26a, 26b or one of the outer teeth 26a2, 26b 2 can be provided with a hinge.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

Le dispositif est constitué d'un inducteur électromagnétique multipolaire pour induire un mouvement de rotation dans le métal en fusion. Pour permettre le retrait de l'inducteur, le noyau (14) est déplaçable et comporte au moins deux branches (14b, 14c) disposées autour de la ligne de coulée.The device consists of a multipolar electromagnetic inductor to induce a rotational movement in the molten metal. To allow the inductor to be removed, the core (14) is movable and has at least two branches (14b, 14c) arranged around the casting line.

Description

La présente invention concerne un dispositif de brassage de métal en fusion dans une installation de coulée continue dans laquelle te métal en fusion s'écoule de façon contrôlée d'un réservoir à travers une busette vers un lingotière, ce dispositif étant constitué d'au moins un inducteur électromagnétique comprenant un noyau magnétique et des enroulements et conçu pour induire un mouvement de rotation dans le métal en fusion.The present invention relates to a device for mixing molten metal in a continuous casting installation in which the molten metal flows in a controlled manner from a reservoir through a nozzle to an ingot mold, this device consisting of at least an electromagnetic inductor comprising a magnetic core and windings and designed to induce a rotational movement in the molten metal.

Un dispositif de ce genre est connu par le document EP-A-0 093 068. Le brassage électromagnétique proposé par ce brevet a déjà fait ses preuves et les avantages essentiels sont que l'on peut non seulement dégager les busettes en gas d'encrassement, mais qu'on peut également éviter que les scories et les inclusions surnageant le bain métallique ne soient aspirées par les tourbillons qui se forment lors de la coulée continue, notamment lorsqu'on applique le brassage électromagnétique dans la lingotière ou immédiatement en-dessous de la lingotière. Pour surveiller l'efficacité du décrassage des busettes on emploie un système de commande des inducteurs qu'on relie, d'une part au système de contrôle du débit de l'alimentation de la lingotière en métal liquide, et, d'autre part, au système de contrôle du niveau du métal dans la lingotière. Ainsi, lorsque ce niveau tombe, ce qui est automatiquement compensé par une augmentation du débit de l'alimentation et lorsque l'on constate que cette compensation n'est effectuée que difficilement, on peut en conclure que la busette est entrain de s'obstruer.A device of this kind is known from document EP-A-0 093 068. The electromagnetic stirring proposed by this patent has already proven itself and the essential advantages are that it is not only possible to free the nozzles in fouling gas. , but we can also prevent slag and inclusions from the metal bath from being sucked in by the vortices that form during continuous casting, especially when applying electromagnetic stirring in the mold or immediately below the ingot mold. To monitor the efficiency of the cleaning of the nozzles, an inductor control system is used which is connected, on the one hand, to the system for controlling the flow rate of the supply of the liquid metal ingot mold, and, on the other hand, the metal level control system in the mold. Thus, when this level falls, which is automatically compensated for by an increase in the flow rate of the supply and when it is found that this compensation is only carried out with difficulty, it can be concluded that the nozzle is clogging .

Le document GB-A-2024679 décrit un autre dispositif de brassage comprenant un ou plusieurs inducteurs électromagnétiques qui sont montés sur des traverses mobiles et qui permettent le retrait des inducteurs lorsqu'il s'avère avantageux d'effectuer la coulée sans brassage. Toutefois, ce dispositif n'a pas l'efficacité et le rendement du puissant inducteur à noyau unique du document EP-A-0 093 068 qui entoure le métal en fusion et qui est susceptible d'induire un champ tournant dans le métal.Document GB-A-2024679 describes another stirring device comprising one or more electromagnetic inductors which are mounted on movable sleepers and which allow the inductors to be withdrawn when it proves advantageous to carry out the casting without stirring. However, this device does not have the efficiency and the yield of the powerful single-core inductor of document EP-A-0 093 068 which surrounds the molten metal and which is capable of inducing a rotating field in the metal.

Le document GB-A-2006068 propose un inducteur multipolaire comprenant plusieurs pôles s'étendant perpendiculairement d'un noyau et qui permet d'approcher par un seul côté une ligne de coulée malgré la présence de rouleaux d'avancement qui, en position opérative, se trouvent entre les potes de l'inducteur. Toutefois, cet inducteur ne peut exercer qu'un effet unilatéral car il ne permet pas d'accéder sur 360° à la ligne de coulée.The document GB-A-2006068 proposes a multipolar inductor comprising several poles extending perpendicularly from a core and which allows a casting line to be approached on one side despite the presence of advancement rollers which, in the operative position, are between the inductor mates. However, this inductor can only exert a unilateral effect because it does not allow 360 ° access to the casting line.

Le but de la présente invention est de proposer un nouveau dispositif de brassage qui réunit les avantages des dispositifs connus décrits ci-dessus.The object of the present invention is to provide a new mixing device which combines the advantages of the known devices described above.

Pour atteindre cet objectif, la présente invention est essentiellement caractérisée en ce que l'inducteur électromagnétique est déplaçable transversalement par rapport à la ligne de coulée de métal et en ce que son noyau magnétique est constitué d'une seule pièce à plusieurs branches disposées autour de la ligne de coulée à l'écart de celle-ci et dirigées radialement sur la ligne de coulée.To achieve this objective, the present invention is essentially characterized in that the electromagnetic inductor is displaceable transversely relative to the metal casting line and in that its magnetic core consists of a single piece with several branches arranged around the casting line away from it and directed radially on the casting line.

Selon un premier mode de réalisation, le noyau comporte trois branches pourvues chacune d'un enroulement électromagnétique et qui forment entre elles des angles de 120°. L'inducteur est. de préférence, disposé autour de la busette, mais des inducteurs analogues peuvent être disposés autour de la ligne de coulée dans la zone de refroidissement secondaire.According to a first embodiment, the core comprises three branches each provided with an electromagnetic winding and which form between them angles of 120 °. The inductor is. preferably arranged around the nozzle, but similar inductors can be arranged around the casting line in the secondary cooling zone.

La distance minimale entre les branches de l'inducteur est supérieure au diamètre extérieur de la busette afin de permettre l'engagement et le retrait de l'inducteur.The minimum distance between the branches of the inductor is greater than the outside diameter of the nozzle in order to allow engagement and withdrawal of the inductor.

Pour faciliter le dégagement de I'inducteur·par rapport à la busette, l'une des branches du noyau peut être reliée au reste de celui-ci par l'intermédiaire d'une charnière ce qui permet le rabattement de cette branche.To facilitate the release of the inductor relative to the nozzle, one of the branches of the core can be connected to the rest of the latter by means of a hinge which allows the folding of this branch.

Les trois branches du noyau peuvent être disposées en escalier autour de la busette, ce qui provoque une rotation hélicoîdale dans le métal en fusion.The three branches of the core can be arranged in a staircase around the nozzle, which causes a helical rotation in the molten metal.

Pour éviter les courants de fuite entre les branches adjacentes du noyau, chacune de celles-ci comporte sur sa face intérieure un enroulement à court-circuit.To avoid leakage currents between the adjacent branches of the core, each of these has on its inner face a short-circuit winding.

Selon un autre mode de réalisation, le noyau ne comporte qu'un seul enroulement électromagnétique et deux branches dont les extrémités sont conçues au moyen d'une entaille axiale en forme de fourche à deux dents, et dans lequel une dent d'une branche et la dent diamétralement opposée de l'autre branche comportent un enroulement à court-circuit.According to another embodiment, the core comprises only one electromagnetic winding and two branches, the ends of which are designed by means of an axial notch in the form of a fork with two teeth, and in which a tooth of a branch and the diametrically opposite tooth of the other branch has a short circuit winding.

Le perfectionnement dont fait l'objet le dispositif proposé par l'invention comparé à l'état de la technique réside dans le fait que l'inducteur n'est plus au contact de la busette ou de la ligne de coulée et qu'il peut en être retiré en cas de besoin. L'avantage qui en résulte est que la partie électrique de l'inducteur peut être disposée hors de la zone chaude, ce qui simplifie sa construction et supprime ou facilite son refroidissement. En outre, l'inducteur proposé par l'invention ne gêne pas l'accès à la busette et à la lingotière, ce qui facilite le contrôle de l'opération de coulée et l'introduction dans la lingotière d'ajoutes et d'additifs métallurgiques.The improvement to which the device proposed by the invention is subject compared with the state of the art lies in the fact that the inductor is no longer in contact with the nozzle or the casting line and that it can be removed if necessary. The resulting advantage is that the electrical part of the inductor can be placed outside the hot zone, which simplifies its construction and eliminates or facilitates its cooling. In in addition, the inductor proposed by the invention does not hinder access to the nozzle and the ingot mold, which facilitates the control of the casting operation and the introduction into the ingot mold of metallurgical additives and additives. .

Par ailleurs, le fait que le noyau est constitué d'une seule pièce dont les branches sont orientées radialement sur la ligne de coulée permet la création d'un champ rotatif très puissant.Furthermore, the fact that the core consists of a single piece whose branches are oriented radially on the casting line allows the creation of a very powerful rotary field.

D'autres avantages et caractéristiques ressortiront de la description détaillée d'un mode de réalisation préféré, présenté ci-dessous, à titre d'illustration en référence aux dessins annexés dans lesquels:

  • la figure 1 montre une vue en plan de l'inducteur électromagnétique selon l'invention,
  • la figure 2 illustre schématiquement une variante du mode de réalisation de la figure 1 et
  • la figure 3 illustre schématiquement un deuxième mode de réalisation d'un inducteur selon l'invention.
Other advantages and characteristics will emerge from the detailed description of a preferred embodiment, presented below, by way of illustration with reference to the appended drawings in which:
  • FIG. 1 shows a plan view of the electromagnetic inductor according to the invention,
  • FIG. 2 schematically illustrates a variant of the embodiment of FIG. 1 and
  • Figure 3 schematically illustrates a second embodiment of an inductor according to the invention.

Sur la figure 1, on aperçoit, en coupe transversale, une busette 10, du genre de celle décrite dans le document EP-A-0 093 068, cette busette étant disposée perpendiculairement au plan de la figure. Cette busette 10 se trouve entre une poche de coulée continue, non montrée, et une lingotière de coulée continue, symbolisée par la référence 12. L'écoulement de métal en fusion à travers la busette 10 est réglé de telle manière que la partie inférieure de la busette se trouve en-dessous du niveau du bain métallique et qu'elle soit, de ce fait, immergée en permanence pendant la coulée. La busette et le fonctionnement du dispositif de brassage ne seront pas décrits davantage dans le cadre de la présente demande de brevet, la demande précitée à laquelle le lecteur voudra se référer fournissant suffisamment d'informations à ce sujet. Qu'il soit simplement rappelé que l'inducteur électromagnétique proposé dans la demande de brevet ci-dessus a une forme cylindrique et est disposé coaxialement autour de la busette.In Figure 1, we can see, in cross section, a nozzle 10, of the type described in document EP-A-0 093 068, this nozzle being arranged perpendicular to the plane of the figure. This nozzle 10 is located between a continuous casting ladle, not shown, and a continuous casting mold, symbolized by the reference 12. The flow of molten metal through the nozzle 10 is adjusted in such a way that the lower part of the nozzle is located below the level of the metal bath and is therefore permanently submerged during casting. The nozzle and the operation of the stirring device will not be described further in the context of the present patent application, the aforementioned application to which the reader will wish to refer providing sufficient information on this subject. It should simply be recalled that the electromagnetic inductor proposed in the above patent application has a cylindrical shape and is arranged coaxially around the nozzle.

L'inducteur électromagnétique proposé par la présente invention comporte un noyau magnétique 14 à trois branches 14a, 14b, 14c, présentant la configuration générale de la lettre E, les extrémités des deux branches extérieures 14b et 14c étant recourbées en direction de la branche médiane de sorte que les axes des trois branches 14a, 14b, 14c ont un point ou axe d'intersection commun 0 en face de la branche médiane 14a. Les trois branches ont, en outre, une disposition symétrique autour de l'axe 0, c'est-à-dire forment entre eux des angles de 1200.The electromagnetic inductor proposed by the present invention comprises a magnetic core 14 with three branches 14a, 14b, 14c, having the general configuration of the letter E, the ends of the two outer branches 14b and 14c being bent in the direction of the middle branch of so that the axes of the three branches 14a, 14b, 14c have a common point or axis of intersection 0 opposite the middle branch 14a. The three branches have, moreover, a symmetrical arrangement around the axis 0, that is to say form between them angles of 1200.

Autour de chacune des branches 14a, 14b, 14c du noyau sont arrangés des enroulements électromagnétiques respectifs 16, 18 et 20.Around each of the branches 14a, 14b, 14c of the core are arranged respective electromagnetic windings 16, 18 and 20.

En position opérative, l'inducteur est disposé autour de la busette 10 de telle manière que l'axe O coïncide avec l'axe central de celle-ci. Toutefois, conformément à l'une des particularités de la présente invention, l'inducteur est déplaçable transversalement par rapport à la busette 10, cette mobilité étant symbolisée par la flèche A. Le noyau 14 peut, à cet effet, être monté sur un chariot mobile non montré.In the operative position, the inductor is arranged around the nozzle 10 in such a way that the axis O coincides with the central axis of the latter. However, in accordance with one of the features of the present invention, the inductor can be moved transversely relative to the nozzle 10, this mobility being symbolized by the arrow A. The core 14 can, for this purpose, be mounted on a carriage mobile not shown.

Pour pouvoir être engagé autour de la busette 10 et en être dégagé, il faut, bien entendu, que la distance entre les branches 14b et 14c soit supérieure au diamètre de la busette 10. Si ceci n'était pas possible pour une raison ou l'autre, ou, à titre de mesure de facilité d'engagement et de dégagement de l'inducteur, le noyau 14 peut être pourvu d'une charnière 22 pour écarter l'une des branches. extérieures 14b ou 14c. Cette charnière peut être prévue à l'endroit indiqué sur la figure 1 pour permettre le rabattement de la branche 14b dans le sens de la flèche B, ou bien dans la région de la courbure de la branche 14b.To be able to be engaged around the nozzle 10 and to be released therefrom, it is of course necessary that the distance between the branches 14b and 14c is greater than the diameter of the nozzle 10. If this was not possible for a reason or the 'other, or, as a measure of ease of engagement and disengagement of the inductor, the core 14 may be provided with a hinge 22 to separate one of the branches. exterior 14b or 14c. This hinge can be provided at the location indicated in Figure 1 to allow the folding of the branch 14b in the direction of arrow B, or in the region of the curvature of the branch 14b.

L'inducteur proposé fonctionne à la manière d'un moteur électrique, les trois enroulements 16, 18 et 20 étant connectés à un courant alternatif triphasé, alors que la colonne de métal liquide de la busette 10 fait fonction de rotor.The proposed inductor operates like an electric motor, the three windings 16, 18 and 20 being connected to a three-phase alternating current, while the liquid metal column of the nozzle 10 acts as a rotor.

La fréquence du courant alternatif alimentant les enroulements 16, 18 et 20 est normalement celle du réseau. Toutefois, il est préférable de prévoir des moyens permettant une diminution de la fréquence, notamment lorsque le produit à traiter présente une faible perméabilité magnétique ce qui est souvent le cas lors de l'emploi du dispositif de brassage dans la zone de refroidissement secondaire.The frequency of the alternating current supplying the windings 16, 18 and 20 is normally that of the network. However, it is preferable to provide means allowing a reduction in the frequency, in particular when the product to be treated has a low magnetic permeability which is often the case when the stirring device is used in the secondary cooling zone.

Lorsqu'on veut également obtenir un chauffage du métal liquide, une fréquence supérieure à la fréquence du réseau pourra être employée.When it is also desired to obtain a heating of the liquid metal, a frequency greater than the frequency of the network may be used.

Quoiqu'il soit préférable de prévoir un système à trois phases; est possible d'effectuer le brassage au moyen d'un système à deux phases, c'est-à-dire un noyau magnétique à deux branches opposées.Although it is preferable to plan a three-phase system; brewing is possible using a two-phase system, i.e. a magnetic core with two opposite branches.

Il n'est pas nécessaire que les branches 14a, 14b et 14c soient disposées au même miveau, c'est-à-dire que leurs axes soient coplanaires. Bien au contraire, les branches 14a, 14b et 14c peuvent notamment avoir une disposition en forme d'escalier autour de la busette 10, ce qui permet la création dans le bain métallique d'un mouvement de rotation hélicoïdal.It is not necessary that the branches 14a, 14b and 14c are arranged at the same level, that is to say that their axes are coplanar. On the contrary, the branches 14a, 14b and 14c may in particular have a staircase-shaped arrangement around the nozzle 10, which allows the creation in the metal bath of a helical rotation movement.

Dans certains cas, il peut être préférable d'effectuer un brassage asymétrique par rapport à l'axe du produit coulé, notamment dans la zone de refroidissement secondaire. Ce brassage asymétrique peut être obtenu en plaçanf les trois branches à des distances différentes par rapport à l'axe de la ligne de coulée. Il est également possible de prévoir des angles différents entre les trois branches du noyau.In certain cases, it may be preferable to carry out an asymmetrical stirring with respect to the axis of the cast product, in particular in the secondary cooling zone. This asymmetrical mixing can be obtained by placing the three branches at different distances from the axis of the casting line. It is also possible to provide different angles between the three branches of the core.

Il est également possible, par exemple, pour intensifier le brassage, de placer plusieurs inducteurs l'un à côté de l'autre.It is also possible, for example, to intensify the mixing, to place several inductors one beside the other.

Le meilleur résultat est obtenu lorsque toutes les lignes de champ électromagnétiques sont concentrées entre la busette 10 et chacune des extrémités des branches 14a, 14b, 14c. A cet effet, il est préférable de prévoir des moyens qui réduisent les courants de fuite s'établissant entre la branche centrale 14a et chacune des branches latérales 14b, 14c du noyau.The best result is obtained when all the electromagnetic field lines are concentrated between the nozzle 10 and each of the ends of the branches 14a, 14b, 14c. To this end, it is preferable to provide means which reduce the leakage currents established between the central branch 14a and each of the lateral branches 14b, 14c of the core.

La figure 2 illustre un exemple d'une telle réalisation. Sur cette figure, où les enroulements 16, 18, 20 de la figure 1 n'ont pas été représentés, les faces intérieures adjacentes des trois branches 14a, 14b et 14c comportent des spires ou enroulements à courts-circuits 24. Les courants de fuites s'établissant perpendiculairement entre la branche 14a, d'une part, et les branches 14b et 14c, d'autre part, engendrent dans ces enroulements 24 un courant dont le champ s'oppose aux courants de fuite.Figure 2 illustrates an example of such an embodiment. In this figure, where the windings 16, 18, 20 of FIG. 1 have not been shown, the adjacent interior faces of the three branches 14a, 14b and 14c comprise turns or short-circuit windings 24. Leakage currents being established perpendicularly between the branch 14a, on the one hand, and the branches 14b and 14c, on the other hand, generate in these windings 24 a current whose field opposes the leakage currents.

Il est bien entendu possible de remplacer les enroulements 24 par d'autres moyens appropriés comme par exemple des plaques métalliques à faible résistivité.It is of course possible to replace the windings 24 by other suitable means such as for example low resistivity metal plates.

La figure 3 montre un mode de réalisation d'un inducteur conçu pour des installations plus petites ou des installations dans lesquelles la place disponible pour l'inducteur est plus réduite. L'inducteur selon la figure 3, qui fonctionne sur courant monophasé.comporte un noyau magnétique 26 à deux branches 26a et 26b présentant la configuration générale de la lettre C, c'est-à-dire qu'il manque la branche centrale du mode de réalisation de la figure 1. Ce noyau 26 ne comporte qu'un seul enroulement électromagnétique et pour lui permettre d'engendrer, en monophase, un champ rotatif dans la busette non représentée, mais se trouvant entre les extrémités des branches 26a et 26b, celles-ci sont conçues au moyen d'une entaille axiale sous forme de deux dents 26a,, 26a2 et 26b,, 26b,. Les dents diamétralement opposées, dans l'exemple représenté les dents 26a2 et 26b,, sont munies d'enroulements à court-circuit 30, 32. L'effet de ceux-ci est qu'à la fréquence d'une demi-phase, les lignes de champs s'établissent al- temativement entre les dents opposées 26a2 et 26b., d'une part, et les dents opposées 26a1 et 26b, , d'autre part, pour engendrer un champ rotatif entre les quatre dents, c'est-à-dire dans la ligne de coulée.FIG. 3 shows an embodiment of an inductor designed for smaller installations or installations in which the space available for the inductor is reduced. The inductor according to FIG. 3, which operates on single-phase current. Carries a magnetic core 26 with two branches 26a and 26b having the general configuration of the letter C, that is to say that the central branch of the mode is missing. of embodiment of FIG. 1. This core 26 has only one electromagnetic winding and to allow it to generate, in monophase, a rotary field in the nozzle not shown, but located between the ends of the branches 26a and 26b, these are designed by means of an axial cut in the form of two teeth 26a ,, 26a 2 and 26b ,, 26b ,. The diametrically opposite teeth, in the example shown the teeth 26a 2 and 26b ,, are provided with short-circuit windings 30, 32. The effect of these is that at the frequency of half a phase , the field lines are established alternately between the opposite teeth 26a 2 and 26b., on the one hand, and the opposite teeth 26a 1 and 26b, on the other hand, to generate a rotary field between the four teeth , that is to say in the casting line.

Dans ce mode de réalisation, la distance entre les dents 26a, et 26b2 est également supérieure au diamètre de la busette ou, si cette conception pose des problèmes, l'une des branches 26a, 26b ou l'une des dents extérieures 26a2, 26b2 peut être pourvue d'une charnière.In this embodiment, the distance between the teeth 26a and 26b 2 is also greater than the diameter of the nozzle or, if this design poses problems, one of the branches 26a, 26b or one of the outer teeth 26a2, 26b 2 can be provided with a hinge.

Il est également possible de prévoir dans le mode de réalisation de la figure 3 les variantes discutées en référence à la figure 1, notamment en vue de l'obtention d'un brassage asymétrique ou à rotation hélicoïdate.It is also possible to provide, in the embodiment of FIG. 3, the variants discussed with reference to FIG. 1, in particular with a view to obtaining asymmetrical or helical rotation mixing.

Claims (11)

1. Dispositif de brassage de métal en fusion dans une installation de coulés continue dans laquelle le métal en fusion s'écoule, de façon contrôlée, d'un réservoir à travers une busette vers une lingotière, ce dispositif étant constitué d'au moins un inducteur électromagnétique comprenant un noyau magnétique et des enroulements et conçu pour induire un mouvement de rotation dans le métal en fusion, caractérisé en ce que l'inducteur électromagnétique est déplaçable transversalement à la ligne de coulée de métal et en ce que le noyau magnétique (14) comporte au moins deux branches disposées autour de la ligne de coulée et à l'écart de celle-ci.1. Device for stirring molten metal in a continuous casting installation in which the molten metal flows, in a controlled manner, from a reservoir through a nozzle to an ingot mold, this device consisting of at least one electromagnetic inductor comprising a magnetic core and windings and designed to induce a rotational movement in the molten metal, characterized in that the electromagnetic inductor is movable transversely to the metal casting line and in that the magnetic core (14 ) has at least two branches arranged around the casting line and away from it. 2. Dispositif selon la revendication 1, caractérisé en ce qu'il est associé à la busette (10).2. Device according to claim 1, characterized in that it is associated with the nozzle (10). 3. Dispositif selon la revendication 1, caractérisé en ci qu'il est associé à la zone de refroidissement secondaire de la coulée continue.3. Device according to claim 1, characterized in that it is associated with the secondary cooling zone of the continuous casting. 4. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le noyau (14) comporte trois branches (14a, 14b, 14c) dont les axes longitudinaux sont perpendiculaires à l'axe O de la ligne de coulée et qui forment entre eux des angles de 120°.4. Device according to any one of claims 1 to 3, characterized in that the core (14) comprises three branches (14a, 14b, 14c) whose longitudinal axes are perpendicular to the axis O of the casting line and which form 120 ° angles between them. 5. Dispositif selon la revendication 4, caractérisé par des enroulements à court-circuit (24) disposés sur les faces adjacentes intérieures des branches - (14a, 14b, 14c) du noyau magnétique.5. Device according to claim 4, characterized by short-circuit windings (24) arranged on the adjacent inner faces of the branches - (14a, 14b, 14c) of the magnetic core. 6. Dispositif selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le noyau magnétique (26) ne comporte qu'un seul enroulement électromagnétique (28) et deux branches - (26a) (26b) dont les extrémités sont conçues, au moyen d'une entaille axiale, en forme de fourche à deux dents (26a,, 26a2), (26b,, 26b2) et en ce qu' une dent (26az)d'une branche (26a) et la dent diamétralement opposée (26b,) de l'autre branche - (26b) comportent un enroulement à court-circuit (30,32).6. Device according to any one of claims 1 to 3, characterized in that the magnetic core (26) comprises only one electromagnetic winding (28) and two branches - (26a) (26b) whose ends are designed , by means of an axial notch, in the form of a fork with two teeth (26a ,, 26a 2 ), (26b ,, 26b2) and in that a tooth (26a z ) of a branch (26a) and the tooth diametrically opposite (26b,) of the other branch - (26b) comprise a short-circuit winding (30,32). 7. Dispositif selon l'une quelconque des revendications 4 à 6, caractérisé en ce que la distance minimale entre les extrémités des branches du noyau magnétique (14) ou entre les extrémités des dents du noyau magnétique (26) est supérieure au diamètre extérieur de la ligne de coulée.7. Device according to any one of claims 4 to 6, characterized in that the minimum distance between the ends of the branches of the magnetic core (14) or between the ends of the teeth of the magnetic core (26) is greater than the outside diameter of the casting line. 8. Dispositif selon l'une quelconque des revendications 4 à 6, caractérisé en ce que l'une des branches (14b, 14c, 26a, 26b) ou l'une des dents (26a2, 26b2) du noyau magnétique (14, 26) est reliée au reste de celui-ci par l'intermédiaire d'une charnière (22).8. Device according to any one of claims 4 to 6, characterized in that one of the branches (14b, 14c, 26a, 26b) or one of the teeth (26a 2 , 26b 2 ) of the magnetic core (14 , 26) is connected to the rest of it by means of a hinge (22). 9. Dispositif selon l'une des revendications 4 ou 6, caractérisé en ce que les branches (14a, 14b, 14c), (26a, 26b) du noyau magnétique (14, 26) sont disposées en escalier autour de la ligne de coulée.9. Device according to one of claims 4 or 6, characterized in that the branches (14a, 14b, 14c), (26a, 26b) of the magnetic core (14, 26) are arranged in a staircase around the casting line . 10. Dispositif selon l'une quelconque des revendications 4 à 6, caractérisé en ce que l'inducteur est disposé de telle manière que les distances. de chacune des branches (14a, 14b, 14c), (26a, 26b) à l'axe de la ligne de coulée soient différentes l'une de l'autre.10. Device according to any one of claims 4 to 6, characterized in that the inductor is arranged in such a way that the distances. of each of the branches (14a, 14b, 14c), (26a, 26b) at the axis of the casting line are different from each other. 11. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce que plusieurs inducteurs sont disposés l'un à côté de l'autre.11. Device according to any one of claims 1 to 10, characterized in that several inductors are arranged one next to the other.
EP86104374A 1985-04-10 1986-03-29 Apparatus for stirring molten metal in a continuous-casting machine Withdrawn EP0197482A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU85846A LU85846A1 (en) 1985-04-10 1985-04-10 DEVICE FOR BREWING MOLTEN METAL IN A CONTINUOUS CASTING SYSTEM
LU85846 1985-04-10

Publications (2)

Publication Number Publication Date
EP0197482A2 true EP0197482A2 (en) 1986-10-15
EP0197482A3 EP0197482A3 (en) 1988-05-11

Family

ID=19730436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104374A Withdrawn EP0197482A3 (en) 1985-04-10 1986-03-29 Apparatus for stirring molten metal in a continuous-casting machine

Country Status (5)

Country Link
US (1) US4749026A (en)
EP (1) EP0197482A3 (en)
JP (1) JPS61276755A (en)
BE (1) BE904562A (en)
LU (1) LU85846A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613647A1 (en) * 1987-04-13 1988-10-14 Alsthom DEVICE FOR ELECTROMAGNETIC BREWING OF LIQUID METAL FOR CONTINUOUS CASTING LINE

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE464503B (en) * 1987-11-12 1991-05-06 Asea Ab REMOVABLE STRAW MIXER
DE3829810A1 (en) * 1988-09-02 1990-03-15 Leybold Ag METHOD AND DEVICE FOR PERFECTLY POURING METAL MELTS
DE19843354C1 (en) * 1998-09-22 2000-03-09 Ald Vacuum Techn Gmbh Apparatus for oriented solidification of a metal melt cast into a mold shell comprises guide sheets in the liquid metal cooling bath for purposes of controlling the bath flow produced by magnetic fields
IL140246A (en) * 2000-12-12 2007-09-20 Pavel Dvoskin Treating molten metals by moving electric arc during solidification
SE523472C2 (en) * 2001-01-10 2004-04-20 Abb Ab Electromagnetic brake and its use
IL144422A0 (en) * 2001-07-18 2002-05-23 Netanya Plasmatec Ltd Riser(s) size reduction and/or metal quality improving in gravity casting of shaped products by moving electric arc
IL145099A0 (en) * 2001-08-23 2002-06-30 Netanya Plasmatec Ltd Method and apparatus for stirring and treating continuous and semi continuous metal casting
FR2840821B1 (en) * 2002-06-13 2005-03-04 Commissariat Energie Atomique ELECTROMAGNETIC DEVICE FOR FUSION AND INTERFACIAL AGITATION OF DIPHASIC SYSTEMS, IN PARTICULAR FOR THE ACCELERATION OF METALLURGIC OR PYROCHEMICAL PROCESSES
US7350559B2 (en) * 2002-12-16 2008-04-01 Energetics Technologies, Llc Systems and methods of electromagnetic influence on electroconducting continuum
US20090021336A1 (en) * 2002-12-16 2009-01-22 Energetics Technologies, Llc Inductor for the excitation of polyharmonic rotating magnetic fields
DE602008006049D1 (en) * 2008-05-30 2011-05-19 Abb Ab continuous casting
WO2015188573A1 (en) * 2014-06-10 2015-12-17 东北大学 Continuous casting method and device with electromagnetic swirling nozzle
CN105268935B (en) * 2014-06-10 2017-10-20 东北大学 A kind of two-flap type submersed nozzle electromagnetic eddy flow device and its support meanss
CN105195697A (en) * 2014-06-10 2015-12-30 东北大学 Electromagnetic rotational flow device opened at single side and support device thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1086957A (en) * 1952-08-27 1955-02-17 Casting process
GB2006068A (en) * 1977-09-23 1979-05-02 Aeg Elotherm Gmbh Device for generating an electro- magnetic rotary field
GB2024679A (en) * 1978-06-23 1980-01-16 Mannesmann Ag Apparatus for receiving and moving electromagnetic stirrer mechanisms in continuous casting apparatus
WO1980001999A1 (en) * 1979-03-21 1980-10-02 British Steel Corp Continuous casting of steel
EP0023897A1 (en) * 1979-08-01 1981-02-11 VOEST-ALPINE Aktiengesellschaft Installation in a continuous casting plant
EP0093068A1 (en) * 1982-04-22 1983-11-02 Paul Metz Use of mould nozzles

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2743492A (en) * 1953-04-20 1956-05-01 Allegheny Ludlum Steel Apparatus for controlling the flow of molten metal
US3574485A (en) * 1958-11-28 1971-04-13 Broido Louis Method and apparatus for movement of liquids by electromagnetic means
SE410284B (en) * 1978-02-10 1979-10-08 Asea Ab PROCEDURE FOR REMOVAL OF METALLIC MELT AND DEVICE FOR IMPLEMENTATION OF THIS PROCEDURE
DE2834305A1 (en) * 1978-08-03 1980-02-14 Aeg Elotherm Gmbh Electromagnetic stirrer for molten metal in continuous casting plant - where magnet cores and coils can be adjusted radially to suit shape and size of cast billet
DE2944760A1 (en) * 1979-11-06 1981-05-07 Siemens AG, 1000 Berlin und 8000 München DEVICE FOR STIRRING METAL MELT IN CONTINUOUS CASTING MILLS

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1086957A (en) * 1952-08-27 1955-02-17 Casting process
GB2006068A (en) * 1977-09-23 1979-05-02 Aeg Elotherm Gmbh Device for generating an electro- magnetic rotary field
GB2024679A (en) * 1978-06-23 1980-01-16 Mannesmann Ag Apparatus for receiving and moving electromagnetic stirrer mechanisms in continuous casting apparatus
WO1980001999A1 (en) * 1979-03-21 1980-10-02 British Steel Corp Continuous casting of steel
EP0023897A1 (en) * 1979-08-01 1981-02-11 VOEST-ALPINE Aktiengesellschaft Installation in a continuous casting plant
EP0093068A1 (en) * 1982-04-22 1983-11-02 Paul Metz Use of mould nozzles

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2613647A1 (en) * 1987-04-13 1988-10-14 Alsthom DEVICE FOR ELECTROMAGNETIC BREWING OF LIQUID METAL FOR CONTINUOUS CASTING LINE
EP0286960A1 (en) * 1987-04-13 1988-10-19 Gec Alsthom Sa Device for electromagnetically stirring liquid metal in a continuous-casting line
US4834168A (en) * 1987-04-13 1989-05-30 Alsthom Device for electromagnetically stirring liquid metal on a continuous casting line

Also Published As

Publication number Publication date
BE904562A (en) 1986-07-31
EP0197482A3 (en) 1988-05-11
LU85846A1 (en) 1986-11-05
JPS61276755A (en) 1986-12-06
US4749026A (en) 1988-06-07

Similar Documents

Publication Publication Date Title
EP0197482A2 (en) Apparatus for stirring molten metal in a continuous-casting machine
EP2550121B1 (en) Stirring roller for a continuous slab-casting machine
EP2830794B1 (en) Stirring roller for a machine for the continuous casting of metallic products of broad cross section
CA2312876C (en) Electromagnetic braking device for a smelting metal in a continuous casting installation
EP0103220B1 (en) Casting channel with induction heating
FR2568797A1 (en) METHOD AND APPARATUS FOR CASTING CONDUCTIVE AND SEMICONDUCTOR MATERIALS
EP1633512B1 (en) Continouos casting installation for the electromagnetic rotation of molten metal moving inside the nozzle
EP0542021B1 (en) Electromagnetic stirring during continuous casting
FR2693071A1 (en) Homogeneous inductive heating device for flat metallic products on parade.
EP0005676A2 (en) Electromagnetic agitating process applied to continuous casting
EP0286960B1 (en) Device for electromagnetically stirring liquid metal in a continuous-casting line
EP0053060B2 (en) Inductor with travelling field and orientated flux for a stirrer for continuous casting slabs
FR2705259A1 (en) Device for supplying molten metal, in particular cast iron, with a casting machine, and casting installation incorporating this feed device.
EP1259343B1 (en) Equipment for supplying molten metal to a continuous casting ingot mould and method for using same
FR2632549A1 (en) LINGOTIERE FOR THE CONTINUOUS CASTING OF BILLETTES OR BLOOMS
EP0022711B1 (en) Process and agitating means for ameliorating the quality of continuous cast metals
EP0079290A1 (en) Equipment for the temperature measurement and/or the sampling of a refining installation
EP0778098A2 (en) Electromagnetic agitating method for continuous casting
FR2894167A1 (en) EQUIPMENT FOR CONTINUOUS METAL CASTING DISTRIBUTION CASTING
FR2473244A1 (en) Pulsed field induction heating for metals - using rotating DC coils or rotating yoke element to vary magnetic circuit reluctance
EP0030910A1 (en) Pouring tubes for continuous electrorotative casting of metals
EP0240482B1 (en) Installation for casting steel
CH633660A5 (en) CONDUCTION PUMP FOR LIQUID METAL.
FR2725647A1 (en) BAND CASTING APPARATUS, METHOD FOR CASTING METAL BAND
FR2576812A1 (en) Method for the horizontal continuous casting of metals, particularly steel, and device for implementing this method

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT DE FR GB IT NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT DE FR GB IT NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19881112

RIN1 Information on inventor provided before grant (corrected)

Inventor name: KIRSCH, PAUL

Inventor name: METZ, PAUL