EP0022711A1 - Process and agitating means for ameliorating the quality of continuous cast metals - Google Patents

Process and agitating means for ameliorating the quality of continuous cast metals Download PDF

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Publication number
EP0022711A1
EP0022711A1 EP80401027A EP80401027A EP0022711A1 EP 0022711 A1 EP0022711 A1 EP 0022711A1 EP 80401027 A EP80401027 A EP 80401027A EP 80401027 A EP80401027 A EP 80401027A EP 0022711 A1 EP0022711 A1 EP 0022711A1
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EP
European Patent Office
Prior art keywords
magnetic field
magnetic
inductor
rotating
metal
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Granted
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EP80401027A
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German (de)
French (fr)
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EP0022711B1 (en
Inventor
Jean-Paul Pouillange
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Compagnie Electro Mecanique SA
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Compagnie Electro Mecanique SA
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    • 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
    • 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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the invention relates to a method and a stirring device intended to improve the quality of a continuously cast metal.
  • One of these devices described in French patent of the Applicant No. 2 231 454, comprises an inductor arranged inside a roll for guiding the slab below the ingot mold, and creating around it a sliding field so as to create a lateral movement of the still liquid part located behind the cooled crust.
  • the subject of the invention is a method and a device intended to improve the quality of a continuously cast metal which have, for the same effects as described above, a clearly higher yield and an increased stirring movement.
  • the method is characterized in that an inductor rotating a magnetic field £ fixed relative to the inductor is rotated about an axis parallel at least to one of the surfaces of the cast product.
  • the relative displacement will be a rotational displacement around an axis perpendicular to the pouring axis or an axis parallel thereto.
  • the devices corresponding to this process will therefore include means for producing a constant magnetic field consisting of permanent magnets or electromagnets, the magnetizing power therefore being supplied in this second case by a direct current as in a rotor of a synchronous machine. .
  • the devices for rotating these devices are provided so as to create the relative movement of the magnets and thus to cause eddy currents in the liquid metal and to give rise to forces for the circulation of the liquid metal.
  • FIG. 1 In Figure 1 is shown in 1 a billet being cooled below the mold, the still liquid metal being shown in 2.
  • a stirring device 3 is placed around the billet. It comprises an inductor 4 comprising a cylindrical yoke 5 in which are fixed two inductor poles 6 made of magnetically hard material so as to create a uniform field crossing the cylindrical space partially occupied by the billet. To facilitate the realization, these poles can be executed by stacking relatively thin elements 7 arranged according to generatrices and glued together.
  • a particularly well suited material for making such a stack is magnetic rubber, which can be arranged in a uniform layer, either pre-magnetized or magnetizable after installation, for example by placing an alternator rotor inside the available cylindrical space. in which a suitable shock current will be sent.
  • the cylinder head 5 is arranged in two mounting elements 8 and 9 and the assembly of the inductor 4 is placed in a casing 10 of steel which has a lower disc part 11 and a cylindrical lateral part 12, so that the inductor 4 can turn to inside the housing 10.
  • rollers 13a and T3b are provided rotating around axes linked to the mounting elements 8 and 9 and rolling on tracks 14 and 15 integral with the casing 10.
  • the frame 8 has a toothed wheel 16 which allows the inductor to be driven by the electric motor 17 and the gear 18.
  • a cover 19 of ordinary steel makes it possible to serve as a magnetic screen for the leakage flows as well as the wall 11.
  • the assembly of the inductor 4 and the casing 10 is capped by a water jacket 20, of stainless steel for example, comprising a vertical double-walled tube 20a and a double-walled disc 20b, so as to protect the inductor against radiation from the billet and metal splashes from the ingot mold.
  • a water jacket 20 of stainless steel for example comprising a vertical double-walled tube 20a and a double-walled disc 20b, so as to protect the inductor against radiation from the billet and metal splashes from the ingot mold.
  • This shirt will be crossed by a stream of water.
  • poles made of hard magnetic materials make the latter out of magnetically mild steel surrounded by an inductor winding traversed by a direct current. Electric contacts with wipers must be provided in this case between the windings which are placed in a rotating system and the fixed part where the electric current is brought.
  • a device with permanent magnets as described above lends itself remarkably well to its installation in a mold.
  • the rotating assembly will preferably be placed in a toric enclosure surrounding the ingot mold and if necessary filled with water. Only the drive shaft of the drive gear will pass through tightly.
  • the proposed system Compared to solutions with a fixed electromagnetic inductor supplied with alternating current, the proposed system has, on the one hand, the advantage of greater simplicity and, on the other hand, makes it possible to produce fields of higher intensity and not require reactive power other than that requested by the quine motor will provide only the power necessary for stirring, mechanical losses and eddy current losses in the solidified part of the billet and in the fixed parts (screens and water jacket).
  • inductor poles 4 diametrically opposite a helical shape so that the electric currents generated in the billet by the rotation of the inductors are inclined relative to the casting axis and generate forces which have a component parallel to the casting axis, either in the upward direction, or in the downward direction, so as to create a helical mixing, which, as explained in the patent application in France No. 78/15304 of the Applicant, gives a improvement in metal quality superior to that given by simple rotary stirring.
  • FIG. 2 which schematically represents a slab 21 during continuous casting in the part situated below the ingot mold, as well as the pairs of guide rollers 22 of this slab, certain pairs of rollers have been shown such as 221, 222, 223, 224 which represent the particularity of being provided at each of their ends with inductors with cylindrical permanent magnets 23 and 24 on either side of the slab and magnetized transversely in a homogeneous manner so that the lines of force of the magnetic field are perpendicular to a diametral plane.
  • the magnetic axes of the cylindrical permanent magnets 23 and 24 are oriented relative to each other as shown in Figure 3 and rotate at the same speed, different from that of the guide rollers and their arrangement inside of the guide roller will be described later.
  • FIG. 3 which schematically gives the orientation of the magnetic axes of the magnets 24 located on one side of the slab and designated by 241a, 241b, 242a, 242b, 243a, 243b, 244a, 244b
  • the straight arrows passing by the center of the rollers indicate at a given instant the direction of the magnetization
  • the curved arrows located in the circles representing the magnets give the direction of rotation printed to these magnets.
  • Figure 4 gives the detail of a stirring roller such as 22 in the vicinity of one of its ends which contains a cylindrical magnet 24.
  • the hollow guide roller 22 rotates in bearings 25 located at its two ends. It is made in three parts, a central part 22a and two end caps 22b. The central part is located so as to receive at each of its ends the cylindrical magnets 24 located inside a cylindrical sheath 26 of non-magnetic steel. The magnets are driven in rotation by a shaft 27 and rotating in roller bearings 29 and 30 housed in the parts 22a and 22b.
  • a cooling air circulation is provided between the axis and the plug 22b, and countersinks 32 and 33 allow the incoming air in the annular cylindrical space 34 located between the sheath 26 and the guide roller 22 and to come out to go to the other end of it by a central channel 28. Arrows 35 to 38 materialize the circulation of cooling air.
  • the magnet can consist of a stack of ferrite washers in the sheath 26. It can also be formed from a ferrite powder mixed with thermosetting resin then injected and hardened.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • General Induction Heating (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

1. A process for rabbling a continuous flow of metal by the action of a rotating magnetic field on the metal which is cooling, characterised in that in an inductor (4) is caused to rotate and produces a fixed magnetic field in relation to the inductor about an axis parallel to at least one of the surfaces of the cast product (1, 21).

Description

L'invention est relative à un procédé et un dispositif de brassage destinés à améliorer la qualité d'un métal coulé en continu.The invention relates to a method and a stirring device intended to improve the quality of a continuously cast metal.

Les normes de qualité des métaux, acier en particulier, devenant de plus en plus sévères, il est nécessaire, pour éviter des déclassements de qualité ou des rebuts, d'obtenir une régularité de qualité dans la production de plus en plus grande. C'est en particulier le but, dans la production par coulée continue, des dispositifs de brassage du métal pendant la coulée, c'est-à-dire dans la lingotière, et pendant la solidification à des niveaux situés au-dessous de la lingotière où une zone encore liquide appelée fréquemment puits liquide, se trouve au milieu du lingot en refroidissement. Un tel brassage permet d'une part de diminuer la longueur des cristaux pendant la solidification, d'autre part de répartir les impuretés qui ne seraient pas remontées à la surface au-dessus de la lingotière.The quality standards of metals, steel in particular, becoming more and more strict, it is necessary, to avoid quality downgrading or scrap, to obtain a regularity of quality in the production of greater and greater. This is in particular the aim, in the production by continuous casting, of devices for stirring the metal during casting, that is to say in the ingot mold, and during solidification at levels situated below the ingot mold. where an area still liquid, frequently called liquid well, is in the middle of the ingot when cooling. Such stirring makes it possible on the one hand to reduce the length of the crystals during solidification, on the other hand to distribute the impurities which would not have risen to the surface above the mold.

On connaît des dispositifs de brassage électromagnétiques de billettes ou blooms opérant par action d'un champ magnétique rotatif traversant la billette en cours de solidification, le champ magnétique étant créé par des bobines inductrices disposées dans la lingotière ou au-dessous de celle-ci. Un tel dispositif est décrit par exemple dans la demande de brevet français de la Demanderesse publiée sous le N° 2 355 392, ou dans le brevet USA 3 153 820.There are known electromagnetic stirring devices for billets or blooms operating by the action of a rotating magnetic field passing through the billet in the course of solidification, the magnetic field being created by inductor coils arranged in the ingot mold or below it. Such a device is described for example in the French patent application of the Applicant published under No. 2,355,392, or in the US patent 3,153,820.

On connaît également des dispositifs de brassage pour la coulée continue de brames.There are also known stirring devices for the continuous casting of slabs.

L'un de ces dispositifs décrit dans le brevet français de la Demanderesse N° 2 231 454, comporte un inducteur disposé à l'intérieur d'un rouleau de guidage de la brame au-dessous de la lingotière, et créant autour de lui un champ glissant de façon à créer un mouvement latéral de la partie encore liquide situé derrière la croûte refroidie.One of these devices described in French patent of the Applicant No. 2 231 454, comprises an inductor arranged inside a roll for guiding the slab below the ingot mold, and creating around it a sliding field so as to create a lateral movement of the still liquid part located behind the cooled crust.

On connaît également un dispositif de brassage de brames en lingotière de coulée continue ayant fait l'objet de la demande de Brevet français de la Demanderesse publiée sous le n° 2 393 632 et qui comporte un inducteur situé dans la lingotière et créant un champ glissant soit dans le sens latéral pour créer un mouvement horizontal du métal liquide pendant la coulée, soit dans le sens vertical pour créer un mouvement ascendant ou descendant du métal liquide.There is also known a device for brewing slabs in a continuous casting ingot mold which was the subject of the French patent application of the Applicant published under No. 2,393,632 and which comprises an inductor located in the ingot mold and creating a sliding field either in the lateral direction to create a horizontal movement of the liquid metal during casting, or in the vertical direction to create an upward or downward movement of the liquid metal.

Les procédés décrits ci-dessus ont tous l'inconvénient, parce qu'alimentés en courant alternatif et parce que le champ magnétique créé doit traverser un espace d'air considérable, de nécessiter une puissance magnétisante considérable pour une puissance active demandée réduite.The methods described above all have the disadvantage, because supplied with alternating current and because the magnetic field created must pass through a considerable air space, of requiring a considerable magnetizing power for a reduced active power demand.

Il en découle des pertes considérables dans le cuivre, un rendement faible, et des équipements importants pour l'alimentation en énergie.This results in considerable losses in copper, low efficiency, and important equipment for the power supply.

L'invention a pour objet un procédé et un dispositif destinés à améliorer la qualité d'un métal coulé en continu qui aient, pour les mêmes effets que décrits ci-dessus, un rendement nettement supérieur et un mouvement de brassage accru.The subject of the invention is a method and a device intended to improve the quality of a continuously cast metal which have, for the same effects as described above, a clearly higher yield and an increased stirring movement.

Le procédé est caractérisé en ce qu'on fait tourner un inducteur produisant un champ magnétique £ixe par rapport à l'inducteur autour d'un axe parallèle au moins à l'une des surfaces du produit coulé.The method is characterized in that an inductor rotating a magnetic field £ fixed relative to the inductor is rotated about an axis parallel at least to one of the surfaces of the cast product.

Selon les cas, le déplacement relatif sera un déplacement de rotation autour d'un axe perpendiculaire à l'axe de coulée ou d'un axe parallèle à celui-ci.Depending on the case, the relative displacement will be a rotational displacement around an axis perpendicular to the pouring axis or an axis parallel thereto.

Les dispositifs correspondant à ce procédé comporteront donc des moyens de production d'un champ magnétique constant consistant dans des aimants permanents ou des électro-aimants, la puissance magnétisante étant donc fournie dans ce deuxième cas par un courant continu comme dans un rotor de machine synchrone.The devices corresponding to this process will therefore include means for producing a constant magnetic field consisting of permanent magnets or electromagnets, the magnetizing power therefore being supplied in this second case by a direct current as in a rotor of a synchronous machine. .

Par ailleurs des organes de mise en rotation de ces dispositifs sont prévus de façon à créer le mouvement relatif des aimants et à provoquer ainsi des courants de Foucault dans le métal liquide et à faire naître des forces de mise en circulation du métal liquide.Furthermore, the devices for rotating these devices are provided so as to create the relative movement of the magnets and thus to cause eddy currents in the liquid metal and to give rise to forces for the circulation of the liquid metal.

Les figures ci-jointes, se rapportant à deux variantes de dispositifs selon le procédé, aideront à comprendre l'invention parmi lesquelles :

  • La figure 1 représente en coupe diamétrale un dispositif de brassage pour coulée continue de billettes ou blooms.
  • Les figures 2, 3 et 4 représentent un dispositif de brassage pour coulée continue de brames.
  • La figure 2 représente une brame en cours de coulée continue.
  • La figure 3 représente schématiquement le principe du brassage.
  • La figure 4 donne le détail d'un rouleau brasseur.
The attached figures, relating to two variants of devices according to the method, will help to understand the invention, among which:
  • Figure 1 shows in diametrical section a stirring device for continuous casting of billets or blooms.
  • Figures 2, 3 and 4 show a stirring device for continuous casting of slabs.
  • FIG. 2 represents a slab during continuous casting.
  • Figure 3 shows schematically the principle of mixing.
  • Figure 4 shows the detail of a brew roller.

Sur la figure 1 on a représenté en 1 une billette en cours de refroidissement en dessous de la lingotière, le métal encore liquide étant représenté en 2. Un dispositif de brassage 3 est placé autour de la billette. Il comprend un inducteur 4 comprenant une culasse cylindrique 5 dans laquelle sont fixés deux pôles inducteurs 6 exécutés en matériau magnétiquement dur de façon à créer un champ uniforme traversant l'espace cylindrique occupé partiellement par la billette. Pour faciliter la réalisation, ces pôles peuvent être exécutés par empilage d'éléments relativement minces 7 disposés selon des génératrices et collés entre eux.In Figure 1 is shown in 1 a billet being cooled below the mold, the still liquid metal being shown in 2. A stirring device 3 is placed around the billet. It comprises an inductor 4 comprising a cylindrical yoke 5 in which are fixed two inductor poles 6 made of magnetically hard material so as to create a uniform field crossing the cylindrical space partially occupied by the billet. To facilitate the realization, these poles can be executed by stacking relatively thin elements 7 arranged according to generatrices and glued together.

Un matériau particulièrement bien adapté pour réaliser un tel empilage est le caoutchouc magnétique que l'on peut disposer en couche uniforme soit préaimantée, soit aimantable après pose, par exemple en disposant à l'intérieur de l'espace cylindrique disponible un rotor d'alternateur dans lequel on enverra un courant de choc convenable.A particularly well suited material for making such a stack is magnetic rubber, which can be arranged in a uniform layer, either pre-magnetized or magnetizable after installation, for example by placing an alternator rotor inside the available cylindrical space. in which a suitable shock current will be sent.

La culasse 5 est disposée dans deux éléments de monture 8 et 9 et l'ensemble de l'inducteur 4 est placé dans un carter 10 en acier qui a une partie inférieure discale 11 et une partie latérale cylindrique 12, de façon que l'inducteur 4 puisse tourner à l'intérieur du carter 10.The cylinder head 5 is arranged in two mounting elements 8 and 9 and the assembly of the inductor 4 is placed in a casing 10 of steel which has a lower disc part 11 and a cylindrical lateral part 12, so that the inductor 4 can turn to inside the housing 10.

A cet effet sont prévus des galets 13a et T3b tournant autour d'axes liés aux éléments de monture 8 et 9 et roulant sur des chemins 14 et 15 solidaires du carter 10.To this end, rollers 13a and T3b are provided rotating around axes linked to the mounting elements 8 and 9 and rolling on tracks 14 and 15 integral with the casing 10.

La monture 8 possède une roue dentée 16 qui permet l'entraînement de l'inducteur par le moteur électrique 17 et l'engrenage 18.The frame 8 has a toothed wheel 16 which allows the inductor to be driven by the electric motor 17 and the gear 18.

Un couvercle 19 en acier ordinaire permet de servir d'écran magnétique pour les flux de fuite de même que la paroi 11.A cover 19 of ordinary steel makes it possible to serve as a magnetic screen for the leakage flows as well as the wall 11.

L'ensemble de l'inducteur 4 et du carter 10 est coiffé par une chemise d'eau 20, en acier inoxydable par exemple, comportant un tube vertical à double paroi 20a et un disque à double paroi 20b, de façon à protéger l'inducteur contre le rayonnement de la billette et les projections de métal provenant de la lingotière. Cette chemise sera parcourue par un courant d'eau.The assembly of the inductor 4 and the casing 10 is capped by a water jacket 20, of stainless steel for example, comprising a vertical double-walled tube 20a and a double-walled disc 20b, so as to protect the inductor against radiation from the billet and metal splashes from the ingot mold. This shirt will be crossed by a stream of water.

Le fonctionnement est le suivant : la rotation de l'inducteur 4, sous l'action du moteur 17, permet de faire tourner le champ magnétique créé et qui traverse la billette, de sorte que les courants de Foucault engendrés dans celle-ci provoquent par action sur ce champ un mouvement de rotation énergique de la partie 2 encore liquide.The operation is as follows: the rotation of the inductor 4, under the action of the motor 17, makes it possible to rotate the magnetic field created and which crosses the billet, so that the eddy currents generated in it cause by action on this field an energetic rotational movement of the still liquid part 2.

On pourrait, bien entendu, au lieu de pôles en matériaux magnétiques durs réaliser ces derniers en acier magnétiquement doux entourés d'un bobinage inducteur parcouru par un courant continu. Des contacts électriques à frotteurs doivent être prévus dans ce cas entre les enroulements qui sont placés dans un système qui tourne et la partie fixe où est amené le courant électrique.One could, of course, instead of poles made of hard magnetic materials, make the latter out of magnetically mild steel surrounded by an inductor winding traversed by a direct current. Electric contacts with wipers must be provided in this case between the windings which are placed in a rotating system and the fixed part where the electric current is brought.

Un dispositif avec aimants permanents tel que décrit ci-dessus se prête remarquablement bien à son installation au niveau d'une lingotière. Dans ce cas l'ensemble tournant sera placé de préférence dans une enceinte torique entourant la lingotière et si nécessaire remplie d'eau. Seul traversera avec étan­ chéité l'arbre de commande de l'engrenage moteur.A device with permanent magnets as described above lends itself remarkably well to its installation in a mold. In this case the rotating assembly will preferably be placed in a toric enclosure surrounding the ingot mold and if necessary filled with water. Only the drive shaft of the drive gear will pass through tightly.

Par rapport aux solutions avec inducteur électromagnétique fixe alimenté en courant alternatif, le système proposé a, d'une part, l'avantage d'une simplicité plus grande et, d'autre part, permet de réaliser des champs d'intensité supérieure et de ne pas nécessiter de puissance réactive autre que celle demandée par le moteur quine fournira que la puissance nécessaire au brassage, aux pertes mécaniques et aux pertes par courants de Foucault dans la partie solidifiée de la billette et dans les parties fixes (écrans et chemise d'eau).Compared to solutions with a fixed electromagnetic inductor supplied with alternating current, the proposed system has, on the one hand, the advantage of greater simplicity and, on the other hand, makes it possible to produce fields of higher intensity and not require reactive power other than that requested by the quine motor will provide only the power necessary for stirring, mechanical losses and eddy current losses in the solidified part of the billet and in the fixed parts (screens and water jacket).

En variante, il est prévu de donner aux pôles inducteurs 4 diamétralement opposés une forme hélicoïdale de sorte que les courants électriques engendrés dans la billette par la rotation des inducteurs soient inclinés par rapport à l'axe de coulée et engendrent des forces qui présentent une composante parallèle à l'axe de coulée, soit dans la direction ascendante, soit dans la direction descendante, de façon à créer un brassage hélicoïdal, qui, comme expliqué dans la demande de brevet en France N° 78/15304 de la Demanderesse, donne une amélioration de qualité du métal supérieure à celle donnée par le simple brassage rotatif.As a variant, it is planned to give the inductor poles 4 diametrically opposite a helical shape so that the electric currents generated in the billet by the rotation of the inductors are inclined relative to the casting axis and generate forces which have a component parallel to the casting axis, either in the upward direction, or in the downward direction, so as to create a helical mixing, which, as explained in the patent application in France No. 78/15304 of the Applicant, gives a improvement in metal quality superior to that given by simple rotary stirring.

Sur la figure 2 qui représente schématiquement une brame 21 en cours de coulée continue dans la partie située au-dessous de la lingotière, ainsi que les paires de rouleaux de guidage 22 de cette brame, on a représenté certaines paires de rouleaux tels que 221, 222, 223, 224 qui représentent la particularité d'être munis à chacune de leurs extrémités d'inducteurs à aimants permanents cylindriques 23 et 24 de part et d'autre de la brame et magnétisés transversalement de façon homogène de sorte que les lignes de force du champ magnétique soient perpendiculaires à un plan diamétral.FIG. 2 which schematically represents a slab 21 during continuous casting in the part situated below the ingot mold, as well as the pairs of guide rollers 22 of this slab, certain pairs of rollers have been shown such as 221, 222, 223, 224 which represent the particularity of being provided at each of their ends with inductors with cylindrical permanent magnets 23 and 24 on either side of the slab and magnetized transversely in a homogeneous manner so that the lines of force of the magnetic field are perpendicular to a diametral plane.

Les axes magnétiques des aimants permanents cylindriques 23 et 24 sont orientés l'un par rapport à l'autre de la façon indiquée sur la figure 3 et tournent à la même vitesse, différente de celle des rouleaux de guidage et leur agencement à l'intérieur du rouleau de guidage sera décrit plus loin.The magnetic axes of the cylindrical permanent magnets 23 and 24 are oriented relative to each other as shown in Figure 3 and rotate at the same speed, different from that of the guide rollers and their arrangement inside of the guide roller will be described later.

En se référant à la figure 3 qui donne schématiquement l'orientation des axes magnétiques des aimants 24 situés d'un côté de la brame et désignés par 241a, 241b, 242a, 242b, 243a, 243b, 244a, 244b, les flèches droites passant par le centre des rouleaux indiquent à un instant donné la direction de l'aimantation et les flèches courbes situées dans les cercles représentant les aimants donnent le sens de rotation imprimé à ces aimants. On voit que tous les aimants 241a, 242a, 243a, 244a tournent dans un sens et que les aimants 241b etc ... leur faisant face tournent dans l'autre sens.Referring to Figure 3 which schematically gives the orientation of the magnetic axes of the magnets 24 located on one side of the slab and designated by 241a, 241b, 242a, 242b, 243a, 243b, 244a, 244b, the straight arrows passing by the center of the rollers indicate at a given instant the direction of the magnetization and the curved arrows located in the circles representing the magnets give the direction of rotation printed to these magnets. We see that all the magnets 241a, 242a, 243a, 244a rotate in one direction and that the magnets 241b etc ... facing them rotate in the other direction.

On voit de plus que d'un aimant 241 à un aimant 242 les directions des axes magnétiques sont décalées d'un quart de tour dans le sens de la rotation des aimants correspondants en allant de la gauche à la droite.It can also be seen that from a magnet 241 to a magnet 242 the directions of the magnetic axes are offset by a quarter of a turn in the direction of rotation of the corresponding magnets going from left to right.

En faisant tourner en synchronisme les aimants orientés préalablement comme indiqué sur la figure 3, on crée un champ glissant et on entraîne le métal liquide situé dans la partie médiane de la brame dans le sens de la flèche F (figures 2et 3). Si on opère de même sur l'autre côté de la brame avec les inducteurs 23 mais en les faisant tourner en sens inverse, le métal liquide circulera dans le sens de la flèche F', de sorte que l'on créera un brassage par circulation en circuit fermé suivant des contours tels que C.By rotating the magnets oriented beforehand as shown in FIG. 3, a sliding field is created and the liquid metal located in the middle part of the slab is driven in the direction of the arrow F (FIGS. 2 and 3). If the same operation is carried out on the other side of the slab with the inductors 23 but by rotating them in the opposite direction, the liquid metal will circulate in the direction of the arrow F ′, so that a circulation is created. in closed circuit following contours such as C.

.La figure 4 donne le détail d'un rouleau brasseur tel que 22 au voisinage d'une de ses extrémités qui contient un aimant 24 cylindrique. Le rouleau guide creux 22 tourne dans des paliers 25 situés à ses deux extrémités. Il est réalisé en trois parties, µne partie centrale 22a et deux bouchons d'extrémité 22b. La partie centrale est située de façon à recevoir à chacune de ses extrémités les aimants cylindriques 24 situés à l'intérieur d'une gaine cylindrique 26 en acier amagnétique. Les aimants sont entraînés en rotation par un arbre 27 et tournant dans des paliers à rouleaux 29 et 30 logés dans les pièces 22a et 22b. Une circulation d'air de refroidissement est prévue entre l'axe et le bouchon 22b, et des fraisures 32 et 33 permettent à l'air d' arrivée dans l'espace cylindrique annulaire 34 situé entre la gaine 26 et le rouleau guide 22 et d'en ressortir pour aller à l'autre extrémité de celui-ci par un canal central 28. Des flèches 35 à 38 matérialisent la circulation d'air de refroidissement..Figure 4 gives the detail of a stirring roller such as 22 in the vicinity of one of its ends which contains a cylindrical magnet 24. The hollow guide roller 22 rotates in bearings 25 located at its two ends. It is made in three parts, a central part 22a and two end caps 22b. The central part is located so as to receive at each of its ends the cylindrical magnets 24 located inside a cylindrical sheath 26 of non-magnetic steel. The magnets are driven in rotation by a shaft 27 and rotating in roller bearings 29 and 30 housed in the parts 22a and 22b. A cooling air circulation is provided between the axis and the plug 22b, and countersinks 32 and 33 allow the incoming air in the annular cylindrical space 34 located between the sheath 26 and the guide roller 22 and to come out to go to the other end of it by a central channel 28. Arrows 35 to 38 materialize the circulation of cooling air.

L'aimant peut être constitué d'un empilage de rondelles de ferrite dans la gaine 26. On peut également le constituer à partir d'une poudre de ferrite mélangée à de la résine thermodurcissable puis injectée et durcie.The magnet can consist of a stack of ferrite washers in the sheath 26. It can also be formed from a ferrite powder mixed with thermosetting resin then injected and hardened.

Claims (10)

1.Procédé de brassage d'une coulée continue de métal par l'action de champ magnétique rotatif sur le métal en cours de refroidissement caractérisé en ce qu'on fait tourner un inducteur produisant un champ magnétique fixe par rapport à lui-même autour d'un axe parallèle au moins à l'une des surfaces du produit coulé.1. Process for stirring a continuous flow of metal by the action of a rotating magnetic field on the metal being cooled, characterized in that an inductor is rotated producing a fixed magnetic field with respect to itself around d an axis parallel at least to one of the surfaces of the cast product. 2.Dispositif de brassage d'un métal en cours de solidification dans une installation de coulée continue pour la mise en oeuvre du procédé selon la revendication 1, caractérisé en ce qu'il comporte des moyens de création d'un mouvement rotatif de l'inducteur de façon à créer un champ magnétique tournant autour de la coulée.2. Device for brewing a metal being solidified in a continuous casting installation for implementing the method according to claim 1, characterized in that it comprises means for creating a rotary movement of the inductor so as to create a magnetic field rotating around the flow. 3.Dispositif selon la revendication 2, caractérisé en ce que les moyens de production du champ magnétique sont constitués par des aimants permanents.3. Device according to claim 2, characterized in that the means for producing the magnetic field are constituted by permanent magnets. 4.Dispositif selon la revendication 2, caractérisé en ce que les moyens de production du champ magnétique sont constitués par des électro-aimants.4. Device according to claim 2, characterized in that the means for producing the magnetic field are constituted by electromagnets. 5.Dispositif selon la revendication 2 destiné au brassage de billettes ou de blooms caractérisé en ce que deux pôles magnétiques de polarité opposée sont disposés de façon diamétralement opposée à l'intérieur d'une culasse magnétique cylindrique tournant dans une chemise torique au moins partiellement amagnétique et comportant un refroidissement par eau.5. Device according to claim 2 intended for the brewing of billets or blooms characterized in that two magnetic poles of opposite polarity are arranged in diametrically opposite manner inside a cylindrical magnetic yoke rotating in an at least partially non-magnetic toroidal jacket and having water cooling. 6.- Dispositif selon la revendication 5 caractérisé en ce que les pôles sont disposés parallèlement à une génératrice de ladite culasse magnétique.6.- Device according to claim 5 characterized in that the poles are arranged parallel to a generator of said magnetic yoke. 7.- Dispositif selon la revendication 5 caractérisé en ce que les pôles sont conformés selon deux surfaces spiralées diamétralement opposées.7.- Device according to claim 5 characterized in that the poles are shaped according to two diametrically opposite spiral surfaces. 8.- Dispositif selon la revendication 5 caractérisé en ce que ladite chemise torique est partiellement constituée par la lingotière.8.- Device according to claim 5 characterized in that said O-ring is partially formed by the mold. 9.- Dispositif selon la revendication 1 destiné au brassage de brames et comportant des rouleaux de guidage caractérisé en ce qu'il comporte à l'une au moins des extrémités et dans l'axe de ladite extrémité de certains rouleaux de guidage un générateur de champ magnétique d'intensité constante mis en rotation indépendante de celle du rouleau par des moyens appropriés.9.- Device according to claim 1 intended for the mixing of slabs and comprising guide rollers characterized in that it comprises at at least one of the ends and in the axis of said end of certain guide rollers a generator of constant intensity magnetic field rotated independently of that of the roller by appropriate means. 10.- Dispositif suivant la revendication 1 caractérisé en ce qu'un certain nombre de rouleaux présentent à une de leurs extrémités des inducteurs dont les axes magnétiques sont décalés de façon régulière pour créer un champ glissant dans la direction de la coulée et à l'autre extrémité des inducteurs tournant en sens inverses de façon à créer un champ glissant dans la direction inverse.10.- Device according to claim 1 characterized in that a number of rollers have at one of their ends inductors whose magnetic axes are offset regularly to create a sliding field in the direction of casting and other end of the inductors rotating in opposite directions so as to create a sliding field in the opposite direction.
EP80401027A 1979-07-12 1980-07-08 Process and agitating means for ameliorating the quality of continuous cast metals Expired EP0022711B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80401027T ATE2655T1 (en) 1979-07-12 1980-07-08 METHOD AND STIRRING DEVICE FOR IMPROVING THE QUALITATION OF A CONTINUOUSLY CAST METAL.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7918088 1979-07-12
FR7918088A FR2465535A1 (en) 1979-07-12 1979-07-12 BREWING METHOD AND DEVICE FOR IMPROVING THE QUALITY OF CONTINUOUSLY CAST METAL

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EP0022711A1 true EP0022711A1 (en) 1981-01-21
EP0022711B1 EP0022711B1 (en) 1983-03-02

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EP80401027A Expired EP0022711B1 (en) 1979-07-12 1980-07-08 Process and agitating means for ameliorating the quality of continuous cast metals

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EP (1) EP0022711B1 (en)
JP (1) JPS5659568A (en)
AT (1) ATE2655T1 (en)
CA (1) CA1144336A (en)
DE (1) DE3062197D1 (en)
ES (1) ES493321A0 (en)
FR (1) FR2465535A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511274A1 (en) * 1981-08-11 1983-02-18 Sumitomo Metal Ind Rotatable permanent magnet structure for stirring molten metal - provides both shifting and rotating magnetic fields when moved around mould periphery
EP0083898A2 (en) * 1982-01-13 1983-07-20 VALLOUREC Société Anonyme dite. Process and apparatus for continuously casting hollow products employing a magnetic field
FR2537470A2 (en) * 1982-01-13 1984-06-15 Vallourec Magnetic rotor for continuous casting of hollow bodies
FR2628994A1 (en) * 1988-03-28 1989-09-29 Vives Charles Mfg. thixotropic metal jellies in casting moulds - by rotating permanent magnets
EP0768132A1 (en) * 1995-10-12 1997-04-16 Alusuisse Technology & Management AG Process for the casting of a metal strand with thixotropic properties

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800006635A1 (en) * 2018-06-25 2019-12-25 METHOD OF CONTAINING A SLAB DURING CASTING

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1140200A (en) * 1955-01-15 1957-07-16 Boehler & Co Ag Geb Process for moving molten metal in continuous casting plants
US3153820A (en) * 1961-10-09 1964-10-27 Charles B Criner Apparatus for improving metal structure
FR2231454A2 (en) * 1973-05-29 1974-12-27 Cem Comp Electro Mec Slab casting machine - with metal stirring by electrically wound withdrawal rolls
FR2418047A1 (en) * 1978-02-28 1979-09-21 Sumitomo Metal Ind Continuous casting process - with solidification effected in the presence of electric current and magnetic field to agitate molten metal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1140200A (en) * 1955-01-15 1957-07-16 Boehler & Co Ag Geb Process for moving molten metal in continuous casting plants
US3153820A (en) * 1961-10-09 1964-10-27 Charles B Criner Apparatus for improving metal structure
FR2231454A2 (en) * 1973-05-29 1974-12-27 Cem Comp Electro Mec Slab casting machine - with metal stirring by electrically wound withdrawal rolls
FR2418047A1 (en) * 1978-02-28 1979-09-21 Sumitomo Metal Ind Continuous casting process - with solidification effected in the presence of electric current and magnetic field to agitate molten metal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511274A1 (en) * 1981-08-11 1983-02-18 Sumitomo Metal Ind Rotatable permanent magnet structure for stirring molten metal - provides both shifting and rotating magnetic fields when moved around mould periphery
EP0083898A2 (en) * 1982-01-13 1983-07-20 VALLOUREC Société Anonyme dite. Process and apparatus for continuously casting hollow products employing a magnetic field
EP0083898A3 (en) * 1982-01-13 1983-10-05 Vallourec Societe Anonyme Dite. Process and apparatus for continuously casting hollow products employing a magnetic field
FR2537470A2 (en) * 1982-01-13 1984-06-15 Vallourec Magnetic rotor for continuous casting of hollow bodies
FR2628994A1 (en) * 1988-03-28 1989-09-29 Vives Charles Mfg. thixotropic metal jellies in casting moulds - by rotating permanent magnets
EP0768132A1 (en) * 1995-10-12 1997-04-16 Alusuisse Technology & Management AG Process for the casting of a metal strand with thixotropic properties

Also Published As

Publication number Publication date
ES8105171A1 (en) 1981-05-16
FR2465535A1 (en) 1981-03-27
ATE2655T1 (en) 1983-03-15
ES493321A0 (en) 1981-05-16
JPS5659568A (en) 1981-05-23
CA1144336A (en) 1983-04-12
FR2465535B1 (en) 1983-04-15
EP0022711B1 (en) 1983-03-02
DE3062197D1 (en) 1983-04-07

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