EP0470913A1 - Method for controlling thickness of metallic continuous casting strip on rolls - Google Patents

Method for controlling thickness of metallic continuous casting strip on rolls Download PDF

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Publication number
EP0470913A1
EP0470913A1 EP91420226A EP91420226A EP0470913A1 EP 0470913 A1 EP0470913 A1 EP 0470913A1 EP 91420226 A EP91420226 A EP 91420226A EP 91420226 A EP91420226 A EP 91420226A EP 0470913 A1 EP0470913 A1 EP 0470913A1
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Prior art keywords
cylinder
metal
screen
thickness
injector
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EP91420226A
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German (de)
French (fr)
Inventor
Philippe Solignac
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Constellium Issoire SAS
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Pechiney Rhenalu SAS
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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0611—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a single casting wheel, e.g. for casting amorphous metal strips or wires

Definitions

  • the present invention relates to a method for controlling the thickness of a metal strip continuously cast on a cylinder.
  • the liquid material in contact with the cylinder solidifies in the form of a thin layer and entrains via the meniscus an additional quantity of metal so that a continuous strip is finally obtained.
  • the thickness of the strip produced in this way depends on the speed of rotation of the cylinder, the height of the molten material in the opening of the injector as well as the heat transfer characteristics of the cylinder.
  • melt overflow This process of direct continuous casting, also called in the English language: "melt overflow", if it is simple in principle, nevertheless presents certain difficulties of industrial application when one wants, for example, to manufacture strips of relatively large width.
  • the strip produced according to this The method has thickness variations both in the longitudinal and transverse directions, which makes it difficult to use either directly or after having undergone mechanical and / or heat treatments.
  • the gas slide although having beneficial effects on the quality of the strip, can nevertheless have a harmful role because it creates eddies in the mass of metal contained in the injector and causes both the appearance of waves and a dispersion of the oxide skins which float on the surface.
  • the invention which consists of a method for controlling the thickness of a metal strip continuously cast on a cylinder in which the metal is brought into contact in the liquid state with the cooled side wall of a cylinder in rotation on which it solidifies, the said metal being brought in via an injector, the end of which opens in a slot along the generatrix of the cylinder so that its free surface touches the said wall and in which is directed towards said surface a gas slide which elongates along the generator of the cylinder characterized in that it is partially immersed in the metal contained in the injector, to a shallow depth and near the cylinder, a screen that s 'extension along the width of the strip and which is separated from the cylinder by the gas blade.
  • the screen is made from a material not wetted by the metal and resistant to its chemical action. It can be, for example, graphite or a ceramic. It should not deform when hot and its installation generally requires preheating by any known means at a temperature close to that of the metal. Its shape is most often that of a plate with a length close to that of the slot of the injector and its thickness comprised, preferably between 5 and 50 mm, will depend on the nature of the metal used.
  • This screen is immersed in the metal contained in the injector at a depth preferably between 1 and 5 mm, the total height of metal being most often between 10 and 100mm. Its plane forms with the surface of the metal an angle preferably between 10 and 90 degrees; the best results are nevertheless obtained between 30 and 60 degrees.
  • the distance from the screen to the cylinder is preferably between 2 and 5 mm while the distance from the screen to the gas injection nozzle intended to create the gas slide is at least 1 mm.
  • the side wall of the screen constituting its thickness and which plunges into the metal has a rounded profile obtained by careful machining; however, a profile composed of a rectilinear part inclined with respect to the perpendicular to the plane of the screen extended by a rounded part situated on the side of the cylinder is more favorable since it avoids the formation of dead zones in the upstream part of the injector.
  • the generatrix of the rounded part of the profile may be straight and parallel to the generatrix of the cylinder but, preferably, it has a curvature in a horizontal or vertical plane or in both planes at the same time.
  • the curvature is chosen so as to impose an action of the variable gas nozzle on the width of the product and act through this on the shape of the product to pour strips having a transverse profile of particular thickness.
  • the gas blade it is obtained by means of a conventional nozzle in the field of casting such as that which is described, for example, in application WO 87/02285 and which consists of two half-shells fixed against each other using bolts and having on their opposite face a hollow part which delimits a chamber inside which is placed a membrane.
  • This chamber is in relation on one side with a gas source and on the other with a slit of width between 0.2 and 2mm which creates a regular jet of gas over the entire width of the strip.
  • the gas velocity at the outlet of the nozzle is generally between 1 and 200 m / sec. and preferably between 20 and 100m / sec.
  • This nozzle can be mounted on a frame making it possible to adjust its position and its orientation as a function of the conditions of use and in particular of the position of the casting injector.
  • the orientation is marked with respect to the tangent to the cylinder at the point where we leave the bath.
  • the axis of the nozzle can form with this tangent an angle between 0 and 90 degrees but preferably between 10 and 45 degrees.
  • the nozzle mouth distance to the surface of the metal contained in the injector is normally between 2 and 20mm. In all cases, the minimum distance between the cylinder and the nozzle must be greater than 2mm to take into account the hot deformation of the cylinder and the thickness of the strip.
  • the gas it must be dry and perfectly de-oiled; it can be dry air but preferably a neutral gas such as argon or nitrogen. Its temperature is preferably close to that of the metal.
  • the invention will be better understood using the attached figure which shows in vertical section a view of a casting machine equipped with a screen according to the invention.
  • a casting cylinder 1 and an injector 2 containing over a height h the metal 3 which forms a meniscus 4 in contact with the cylinder and solidifies into a strip 5;
  • a nozzle 6 creates a gas plate 7 through the slot 8;
  • the screen 9 according to the invention has at its end 10 a rounded part immersed in the metal.
  • a 500mm wide strip formed by an aluminum alloy of the type 3003 was cast on a copper alloy cylinder according to the standards of the Aluminum Association.
  • the cylinder rotated with a linear speed of 2m / sec.,
  • the temperature of the metal in the injector was between 680 and 690 ° C and its height of 50mm.
  • the blade of gas constituted by argon at 700 ° C circulating at the speed of 40m / sec.
  • It was created by a nozzle provided at its end with a slot of width 1mm placed at a distance of 8mm from the surface of the metal and whose axis was inclined 30 degrees from the tangent to the cylinder.
  • the screen it was made with a parallelipipedic plate of a commercial refractory material of the monalite G3 type with a thickness of 5mm, of length equal to that of the injector, having an end profile that is partly straight and partly curved. , tilted 60 degrees from the surface of the metal contained in the injector, 3mm from the cylinder and submerged to a depth of 5mm.
  • a strip of 0.8 mm of average thickness was obtained having a surface appearance of higher quality than that obtained without the use of a screen, the measurements with a roughness meter giving respectively Ra values of 4 according to the invention and of 12um according to the prior art.
  • Ra values 4 according to the invention
  • 12um 12um according to the prior art.
  • a casting was carried out under the same conditions as those of Example 1 apart from the fact that the generator of the curvature of the profile was curved so that its distance from the cylinder was at its ends less than 1mm than that which separates it in the middle.

Abstract

The invention relates to a method for controlling the thickness of a metal strip (5) cast continually on a roll (1). It consists in using, in combination, a laminar flow of gas (7) directed towards the surface of metal contained in the nozzle and a screen (9) partially submerged in the said metal. It applies to the direct manufacture of thin strips having a smooth surface, a uniform thickness and devoid of defects resulting from the presence of oxides or other impurities. <IMAGE>

Description

La présente invention est relative à un procédé pour contrôler l'épaisseur d'une bande métallique coulée en continu sur un cylindre.The present invention relates to a method for controlling the thickness of a metal strip continuously cast on a cylinder.

Il est connu de l'homme de l'art de la mise en forme des matériaux qu'on peut obtenir directement et en continu une bande métallique d'épaisseur voisine du millimètre par mise en contact d'un métal en fusion avec un cylindre métallique, refroidi qui tourne autour d'un axe horizontal; cette mise en contact étant réalisée au moyen d'un injecteur muni à son extrêmité d'une ouverture en forme de U qui s'allonge parallèlement à la génératrice dudit cylindre de manière que la surface libre du matériau contenu dans l'injecteur effleure la surface du cylindre et forme lors de la rotation un ménisque.It is known to those skilled in the art of shaping materials that can be obtained directly and continuously a metal strip of thickness close to a millimeter by bringing a molten metal into contact with a metal cylinder , cooled which rotates around a horizontal axis; this contacting being carried out by means of an injector provided at its end with a U-shaped opening which elongates parallel to the generator of said cylinder so that the free surface of the material contained in the injector brushes the surface of the cylinder and forms during the rotation a meniscus.

Dans ces conditions, le matériau liquide au contact du cylindre se solidifie sous la forme d'une couche de faible épaisseur et entraîne par l'intermédiaire du ménisque une quantité supplémentaire de métal de sorte qu'on obtient finalement une bande continue.Under these conditions, the liquid material in contact with the cylinder solidifies in the form of a thin layer and entrains via the meniscus an additional quantity of metal so that a continuous strip is finally obtained.

L'épaisseur de la bande produite de cette façon dépend de la vitesse de rotation du cylindre, de la hauteur du matériau en fusion dans l'ouverture de l'injecteur ainsi que des caractéristiques de transfert de chaleur du cylindre.The thickness of the strip produced in this way depends on the speed of rotation of the cylinder, the height of the molten material in the opening of the injector as well as the heat transfer characteristics of the cylinder.

Ce procédé de coulée directe en continu, encore appelé dans le langage anglo-saxon : " melt overflow ", s'il est simple dans son principe, présente néanmoins certaines difficultés d'application industrielle quand on veut, par exemple, fabriquer des bandes de largeur relativement grande.This process of direct continuous casting, also called in the English language: "melt overflow", if it is simple in principle, nevertheless presents certain difficulties of industrial application when one wants, for example, to manufacture strips of relatively large width.

En effet, le plus souvent, la bande élaborée suivant ce procédé présente des variations d'épaisseur aussi bien dans le sens longitudinal que transversal, ce qui la rend difficilement utilisable soit directement ou après avoir subi des traitements mécaniques et/ou thermiques.Indeed, more often than not, the strip produced according to this The method has thickness variations both in the longitudinal and transverse directions, which makes it difficult to use either directly or after having undergone mechanical and / or heat treatments.

D'où la recherche de solutions visant à supprimer cet inconvénient qui ont abouti à la mise en oeuvre par différents inventeurs de moyens permettant de contrôler l'épaisseur et le profil de la bande élaborée.Hence the search for solutions aimed at eliminating this drawback which have led to the implementation by different inventors of means making it possible to control the thickness and the profile of the strip produced.

Mais, ces moyens qui ont fait, le plus souvent, l'objet de dépôts de demandes de brevet, ne semblent pas pour l'instant avoir apporté de véritable solution au problème posé.However, these means, which have most often been the subject of patent applications, do not seem for the moment to have brought a real solution to the problem posed.

On peut citer, par exemple :

  • la demande européenne publiée sous le N° 174765, déposée sous priorité 1984 et dans laquelle pour obtenir un débit uniforme de métal sur toute la largeur de l'ouverture de l'injecteur, on met en oeuvre des barrages 36 immergés partiellement dans le bain métallique que contient l'injecteur.
  • le brevet U.S. N°4,771,819 déposé sous priorité 1985 et qui enseigne l'introduction d'un rouleau rotatif, refroidi et de petit diamètre qui plonge partiellement dans la partie supérieure du bain de métal liquide et dont l'écartement avec le cylindre de coulée sert à determiner l'épaisseur de la bande.
  • la demande de brevet WO 89/07025, déposée sous priorité 1988, décrit également l'utilisation d'un rouleau mais qui est ici chauffé à une température supérieure à la température de fusion du métal coulé ; le contrôle de l'épaisseur étant aussi obtenu par l'espacement entre le cylindre et le rouleau qui ne laisse passer qu'une couche de liquide constante dans le temps et uniforme dans l'espace.
  • le brevet U.S. N°4,842,042, déposé sous prioriété 1988, dans lequel on utilise aussi un rouleau d'axe parallèle à celui du cylindre refroidi mais qui revendique des moyens de réglage d'un espace donné entre ces deux éléments indépendemment des irrégularités de surface du cylindre.
  • la demande de brevet WO 87/02285 dans laquelle pour obtenir une bande ayant une section transversale uniforme et un bon état de surface on dirige une lame de gaz sous faible pression à la surface du métal contenu dans l'injecteur près de l'endroit où le dit métal entre en contact avec le cylindre.
We can cite, for example:
  • European application published under No. 174765, filed under priority 1984 and in which to obtain a uniform flow of metal over the entire width of the injector opening, we use dams 36 partially submerged in the metal bath that the injector contains.
  • US Patent No. 4,771,819 filed under priority 1985 and which teaches the introduction of a rotary roller, cooled and of small diameter which partially plunges into the upper part of the bath of liquid metal and whose spacing with the casting cylinder serves to determine the thickness of the strip.
  • patent application WO 89/07025, filed under priority 1988, also describes the use of a roller but which is here heated to a temperature above the melting temperature of the cast metal; thickness control is also obtained by the spacing between the cylinder and the roller which allows only a layer of liquid constant in time and uniform in space.
  • US Patent No. 4,842,042, filed under priority 1988, in which a roller with an axis parallel to that of the cooled cylinder is also used, but which claims means for adjusting a given space between these two elements independently of the surface irregularities of the cylinder.
  • patent application WO 87/02285 in which, in order to obtain a strip having a uniform cross section and a good surface condition, a blade of gas under low pressure is directed at the surface of the metal contained in the injector near the place where the said metal comes into contact with the cylinder.

En ce qui concerne plus particulièrement cette dernière demande, il apparaît que la lame de gaz, bien qu'ayant des effets bénéfiques sur la qualité de la bande, peut néanmoins avoir un rôle néfaste du fait qu'elle crée des remous dans la masse de métal contenu dans l'injecteur et provoque à la fois l'apparition de vagues et une dispersion des peaux d'oxyde qui flottent à la surface.With regard more particularly to this last request, it appears that the gas slide, although having beneficial effects on the quality of the strip, can nevertheless have a harmful role because it creates eddies in the mass of metal contained in the injector and causes both the appearance of waves and a dispersion of the oxide skins which float on the surface.

D'où l'invention qui consiste en un procédé pour contrôler l'épaisseur d'une bande métallique coulée en continu sur un cylindre dans lequel on met en contact le métal à l'état liquide avec la paroi latérale refroidie d'un cylindre en rotation sur laquelle il se solidifie, le dit métal étant amené par l'intermédiaire d'un injecteur dont l'extrémité s'ouvre suivant une fente le long de la génératrice du cylindre de manière que sa surface libre effleure la dite paroi et dans lequel on dirige vers la dite surface une lame de gaz qui s'allonge le long de la génératrice du cylindre caractérisé en ce que l'on immerge partiellement dans le métal contenu dans l'injecteur, sur une faible profondeur et à proximité du cylindre, un écran qui s 'allonge suivant la largeur de la bande et qui est séparé du cylindre par la lame de gaz.Hence the invention which consists of a method for controlling the thickness of a metal strip continuously cast on a cylinder in which the metal is brought into contact in the liquid state with the cooled side wall of a cylinder in rotation on which it solidifies, the said metal being brought in via an injector, the end of which opens in a slot along the generatrix of the cylinder so that its free surface touches the said wall and in which is directed towards said surface a gas slide which elongates along the generator of the cylinder characterized in that it is partially immersed in the metal contained in the injector, to a shallow depth and near the cylinder, a screen that s 'extension along the width of the strip and which is separated from the cylinder by the gas blade.

Ainsi, l'invention est réalisée par l'adjonction dans un dispositif classique de coulée du type melt overflow d' un écran qui est partiellement immergé dans le métal contenu dans l'injecteur et qui influe sur les phénomènes pouvant se manifester à la surface dudit métal. En particulier, toute perturbation telle que, par exemple, les vagues provenant de l'alimentation en métal frais ou les remous causés par la lame d'air, se trouve confinée à une zone réduite de la surface et son effet est ainsi passablement réduit. Cette atténuation des ondulations de surface a pour résultats:

  • une stabilisation du ménisque
  • un meilleur contrôle du profil d'épaisseur de la bande coulée
  • une amélioration de la surface supérieure de la bande car on évite l'entraînement d'un film de liquide de faible épaisseur avec le métal déjà solidifié.
En outre, la présence d'un écran assure un blocage des impuretés et des oxydes flottant à la surface du métal.Thus, the invention is achieved by the addition in a conventional casting device of the melt overflow type of a screen which is partially immersed in the metal contained in the injector and which influences the phenomena which may occur on the surface of said metal. In particular, any disturbance such as, for example, the waves coming from the supply of fresh metal or the eddies caused by the air space, is confined to a reduced area of the surface and its effect is thus considerably reduced. This attenuation of surface ripples results in:
  • meniscus stabilization
  • better control of the thickness profile of the casting strip
  • an improvement in the upper surface of the strip because it avoids entrainment of a thin film of liquid with the already solidified metal.
In addition, the presence of a screen ensures blockage of impurities and oxides floating on the surface of the metal.

L'écran est réalisé à partir d'un matériau non mouillé par le métal et résistant à son action chimique. Ce peut être, par exemple, du graphite ou une céramique. Il ne doit pas se déformer à chaud et sa mise en place nécessite généralement un préchauffage par tout moyen connu à une température voisine de celle du métal. Sa forme est le plus souvent celle d'une plaque de longueur voisine de celle de la fente de l'injecteur et son épaisseur comprise,de préférence entre 5 et 50mm , dépendra de la nature du métal mis en oeuvre.
Cet écran est immergé dans le métal contenu dans l'injecteur à une profondeur comprise de préférence entre 1 et 5mm, la hauteur totale de métal étant le plus souvent comprise entre 10 et 100mm. Son plan forme avec la surface du métal un angle compris de préférence entre 10 et 90 degrés; les meilleurs résultats sont néanmoins obtenus entre 30 et 60 degrés.The screen is made from a material not wetted by the metal and resistant to its chemical action. It can be, for example, graphite or a ceramic. It should not deform when hot and its installation generally requires preheating by any known means at a temperature close to that of the metal. Its shape is most often that of a plate with a length close to that of the slot of the injector and its thickness comprised, preferably between 5 and 50 mm, will depend on the nature of the metal used.
This screen is immersed in the metal contained in the injector at a depth preferably between 1 and 5 mm, the total height of metal being most often between 10 and 100mm. Its plane forms with the surface of the metal an angle preferably between 10 and 90 degrees; the best results are nevertheless obtained between 30 and 60 degrees.

La distance de l'écran au cylindre est de préférence comprise entre 2 et 5mm tandis que la distance écran-buse d'injection de gaz destinée à créer la lame de gaz est au minimum de 1mm.The distance from the screen to the cylinder is preferably between 2 and 5 mm while the distance from the screen to the gas injection nozzle intended to create the gas slide is at least 1 mm.

De préférence, la paroi latérale de l'écran constituant son épaisseur et qui plonge dans le métal présente un profil arrondi obtenu par un usinage soigneux; toutefois, un profil composé d'une partie rectiligne inclinée par rapport à la perpendiculaire au plan de l'écran prolongé par une partie arrondie située du côté du cylindre est plus favorable car elle évite la formation de zones mortes dans la partie amont de l'injecteur.Preferably, the side wall of the screen constituting its thickness and which plunges into the metal has a rounded profile obtained by careful machining; however, a profile composed of a rectilinear part inclined with respect to the perpendicular to the plane of the screen extended by a rounded part situated on the side of the cylinder is more favorable since it avoids the formation of dead zones in the upstream part of the injector.

La génératrice de la partie arrondie du profil peut être rectiligne et parallèle à la génératrice du cylindre mais, de préférence, elle présente une courbure dans un plan horizontal ou vertical ou dans les deux plans en même temps. Dans le cas d'une génératrice courbe, la courbure est choisie de manière à imposer une action de la buse de gaz variable sur la largeur du produit et agir par ce biais sur la forme du produit pour couler des bandes ayant un profil transversal d'épaisseur particuliere.The generatrix of the rounded part of the profile may be straight and parallel to the generatrix of the cylinder but, preferably, it has a curvature in a horizontal or vertical plane or in both planes at the same time. In the case of a curved generator, the curvature is chosen so as to impose an action of the variable gas nozzle on the width of the product and act through this on the shape of the product to pour strips having a transverse profile of particular thickness.

En ce qui concerne la lame de gaz, elle est obtenue au moyen d'une buse classique dans le domaine de la coulée telle que celle qui est décrite, par exemple, dans la demande WO 87/02285 et qui se compose deux demi-coquilles fixées l'une contre l'autre à l'aide de boulons et présentant sur leur face en regard une partie en creux qui délimite une chambre à l'intérieur de laquelle est placée une membrane. Cette chambre est en relation d'un côté avec une source de gaz et de l'autre avec une fente de largeur comprise entre 0,2 et 2mm qui crée un jet de gaz régulier sur toute la largeur de la bande. La vitesse du gaz à la sortie de la buse est généralement comprise entre 1 et 200m/sec. et de préférence entre 20 et 100m/sec.As regards the gas blade, it is obtained by means of a conventional nozzle in the field of casting such as that which is described, for example, in application WO 87/02285 and which consists of two half-shells fixed against each other using bolts and having on their opposite face a hollow part which delimits a chamber inside which is placed a membrane. This chamber is in relation on one side with a gas source and on the other with a slit of width between 0.2 and 2mm which creates a regular jet of gas over the entire width of the strip. The gas velocity at the outlet of the nozzle is generally between 1 and 200 m / sec. and preferably between 20 and 100m / sec.

Cette buse peut être montée sur un chassis permettant d'ajuster sa position et son orientation en fonction des conditions d'utilisation et notamment de la position de l'injecteur de coulée. L'orientation est repérée par rapport à la tangente au cylindre au point où on quitte le bain. Ainsi, l'axe de la buse peut former avec cette tangente un angle compris entre 0 et 90 degrés mais de préférence entre 10 et 45 degrés. La distance embouchure de la buse à la surface du métal contenu dans l'injecteur se situe normalement entre 2 et 20mm. Dans tous les cas, la distance minimum entre le cylindre et la buse doit être supérieure à 2mm pour tenir compte de la déformation à chaud du cylindre et de l'épaisseur de la bande.This nozzle can be mounted on a frame making it possible to adjust its position and its orientation as a function of the conditions of use and in particular of the position of the casting injector. The orientation is marked with respect to the tangent to the cylinder at the point where we leave the bath. Thus, the axis of the nozzle can form with this tangent an angle between 0 and 90 degrees but preferably between 10 and 45 degrees. The nozzle mouth distance to the surface of the metal contained in the injector is normally between 2 and 20mm. In all cases, the minimum distance between the cylinder and the nozzle must be greater than 2mm to take into account the hot deformation of the cylinder and the thickness of the strip.

Quant au gaz, il doit être sec et parfaitement déshuilé; ce peut être de l'air sec mais, de préférence un gaz neutre tel que l'argon ou l'azote. Sa température est de préférence voisine de celle du métal.As for the gas, it must be dry and perfectly de-oiled; it can be dry air but preferably a neutral gas such as argon or nitrogen. Its temperature is preferably close to that of the metal.

L'invention sera mieux comprise à l'aide de la figure jointe qui représente en coupe verticale une vue d'une machine de coulée équipée d'un écran selon l'invention. De façon plus détaillée, on distingue un cylindre de coulée 1 et un injecteur 2 contenant sur une hauteur h le métal 3 qui forme un ménisque 4 au contact du cylindre et se solidifie en une bande 5 ; une buse 6 crée une lame de gaz 7 par la fente 8 ; l'écran 9 selon l'invention présente à son extrémité 10 une partie arrondie immergée dans le métal.The invention will be better understood using the attached figure which shows in vertical section a view of a casting machine equipped with a screen according to the invention. In more detail, there is a casting cylinder 1 and an injector 2 containing over a height h the metal 3 which forms a meniscus 4 in contact with the cylinder and solidifies into a strip 5; a nozzle 6 creates a gas plate 7 through the slot 8; the screen 9 according to the invention has at its end 10 a rounded part immersed in the metal.

L'invention peut être illustrée à l'aide des exemples d'application suivants :The invention can be illustrated using the following application examples:

EXEMPLE 1.-EXAMPLE 1.-

On a coulé sur un cylindre en alliage de cuivre une bande de largeur 500mm constitué par un alliage d'aluminium du type 3003 suivant les normes de l'Aluminium Association. Le cylindre tournait avec une vitesse linéaire de 2m/sec., la température du métal dans l'injecteur était comprise entre 680 et 690 °C et sa hauteur de 50mm.A 500mm wide strip formed by an aluminum alloy of the type 3003 was cast on a copper alloy cylinder according to the standards of the Aluminum Association. The cylinder rotated with a linear speed of 2m / sec., The temperature of the metal in the injector was between 680 and 690 ° C and its height of 50mm.

En ce qui concerne la lame de gaz constituée par de l'argon à 700°C circulant à la vitesse de 40m/sec., elle était créée par une buse munie à son extrémité d'une fente de largeur 1mm placée à une distance de 8mm de la surface du métal et dont l'axe était incliné de 30 degrés par rapport à la tangente au cylindre. Quant à l'écran, il était réalisé avec une plaque parallèlipipédique en un matériau réfractaire commercial du type monalite G3 d'épaisseur 5mm, de longueur égale à celle de l'injecteur, ayant un profil d'extrémité en partie rectiligne et en partie courbe, inclinée de 60 degrés par rapport à la surface du métal contenu dans l'injecteur, distante du cylindre de 3mm et immergée sur une profondeur de 5mm.As for the blade of gas constituted by argon at 700 ° C circulating at the speed of 40m / sec., It was created by a nozzle provided at its end with a slot of width 1mm placed at a distance of 8mm from the surface of the metal and whose axis was inclined 30 degrees from the tangent to the cylinder. As for the screen, it was made with a parallelipipedic plate of a commercial refractory material of the monalite G3 type with a thickness of 5mm, of length equal to that of the injector, having an end profile that is partly straight and partly curved. , tilted 60 degrees from the surface of the metal contained in the injector, 3mm from the cylinder and submerged to a depth of 5mm.

On a obtenu une bande de 0,8mm d'épaisseur moyenne présentant un aspect de surface de qualité supérieure à celle obtenue sans l'utilisation d'écran, les mesures au rugosimètre donnant respectivement des valeurs de Ra de 4 suivant l'invention et de 12um suivant l'art antérieur. Cependant, on observait des variations d'épaisseur sur la largeur pouvant atteindre 5% et notamment une surépaisseur au voisinage des rives.A strip of 0.8 mm of average thickness was obtained having a surface appearance of higher quality than that obtained without the use of a screen, the measurements with a roughness meter giving respectively Ra values of 4 according to the invention and of 12um according to the prior art. However, there were variations in thickness over the width of up to 5% and in particular an excess thickness in the vicinity of the banks.

EXEMPLE 2.-EXAMPLE 2.-

Une coulée a été réalisée dans les mêmes conditions que celles de l'exemple 1 hormis le fait que la génératrice de la courbure du profil était courbe de sorte que sa distance au cylindre était à ses extrémités inférieure de 1mm à celle qui la sépare en son milieu.A casting was carried out under the same conditions as those of Example 1 apart from the fact that the generator of the curvature of the profile was curved so that its distance from the cylinder was at its ends less than 1mm than that which separates it in the middle.

Dans ces conditions, la rugosité était comparable à celle de l'exemple 1 mais, par contre, les variations d'épaisseur étaient inférieures à 1%.Under these conditions, the roughness was comparable to that of Example 1 but, on the other hand, the variations in thickness were less than 1%.

Claims (9)

1.-Procédé pour contrôler l'épaisseur d'une bande métallique (5)coulée en continu sur un cylindre(1) dans lequel on met en contact le métal à l'état liquide avec la paroi latérale refroidie d'un cylindre en rotation sur laquelle il se solidifie, le dit métal étant amené par l'intermédiaire d'un injecteur(2) dont l'extrémité s'ouvre suivant une fente le long de la génératrice du cylindre de manière que sa surface libre effleure la dite paroi et dans lequel on dirige vers la dite surface une lame de gaz (7)qui s'allonge le long de la génératrice du cylindre caractérisé en ce que l'on immerge partiellement dans le métal contenu dans l'injecteur, sur une faible profondeur et à proximité du cylindre, un écran (9)qui s 'allonge suivant la largeur de la bande et qui est séparé du cylindre par la lame de gaz. 1.- Method for controlling the thickness of a metal strip (5) continuously cast on a cylinder (1) in which the metal in liquid state is brought into contact with the cooled side wall of a rotating cylinder on which it solidifies, the said metal being brought in via an injector (2) the end of which opens in a slot along the generatrix of the cylinder so that its free surface touches the said wall and in which a gas blade (7) which extends along the generator of the cylinder is directed towards the said surface, characterized in that it is partially immersed in the metal contained in the injector, over a shallow depth and at near the cylinder, a screen (9) which extends along the width of the strip and which is separated from the cylinder by the gas slide. 2.-Procédé selon la revendication 1 caractérisé en ce que la profondeur d'immersion de l'écran est comprise entre 1 et 5 mm. 2.- Method according to claim 1 characterized in that the immersion depth of the screen is between 1 and 5 mm. 3.-Procédé selon la revendication 1 caractérisé en ce que l'angle formé par l'écran avec la surface du bain est compris entre 10 et 90 degrés. 3.- Method according to claim 1 characterized in that the angle formed by the screen with the surface of the bath is between 10 and 90 degrees. 4.-Procédé selon la revendication 3 caractérisé en ce que l'angle est compris entre 30 et 60 degrés. 4.- Method according to claim 3 characterized in that the angle is between 30 and 60 degrees. 5.-Procédé selon la revendication 1 caractérisé en ce que la distance de l'écran au cylindre est comprise entre 2 et 5 mm. 5.- Method according to claim 1 characterized in that the distance from the screen to the cylinder is between 2 and 5 mm. 6.-Procédé selon la revendication 1 caractérisé en ce que l'épaisseur de l'écran est comprise entre 5 et 50mm . 6.- Method according to claim 1 characterized in that the thickness of the screen is between 5 and 50mm. 7.-Procédé selon la revendication 1 caractérisé en ce que le le profil dans un plan perpendiculaire à l'axe du cylindre de l'extrémité de l'écran immergée dans le métal a une forme arrondie. 7.- Method according to claim 1 characterized in that the profile in a plane perpendicular to the axis of the cylinder of the end of the screen immersed in the metal has a rounded shape. 8.-Procédé selon la revendication 7 caractérisé en ce que le profil présente une partie rectiligne inclinée par rapport à la perpendiculaire au plan de l'écran prolongée par une partie arrondie située du côté du cylindre. 8.- Method according to claim 7 characterized in that the profile has a rectilinear part inclined relative to the perpendicular to the plane of the screen extended by a rounded part located on the side of the cylinder. 9.-Procédé selon la revendication 1 caractérisé en ce que la génératrice de la partie arrondie est courbe dans un plan horizontal et/ou vertical. 9.- Method according to claim 1 characterized in that the generatrix of the rounded part is curved in a horizontal and / or vertical plane.
EP91420226A 1990-08-08 1991-07-04 Method for controlling thickness of metallic continuous casting strip on rolls Withdrawn EP0470913A1 (en)

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FR9010313A FR2665653A1 (en) 1990-08-08 1990-08-08 METHOD FOR CONTROLLING THE THICKNESS OF A CONTINUOUSLY CAST METAL STRIP ON A CYLINDER.
FR9010313 1990-08-08

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AU (1) AU8169591A (en)
CA (1) CA2048428A1 (en)
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526360A1 (en) * 1991-07-31 1993-02-03 Pechiney Rhenalu Method to improve the surface quality and the regularity in thickness of thin cast metallic ribbons
EP0562984A1 (en) * 1992-03-26 1993-09-29 PECHINEY RECHERCHE (Groupement d'Intérêt Economique régi par l'Ordonnance du 23 Septembre 1967) Immeuble Balzac Thin deformable sheet made from an aluminium alloy having a fine and homogenous microstructure and a high elastic limit
CN106938323A (en) * 2016-01-05 2017-07-11 株式会社日立产机系统 Amorphous foil band manufacture device and the manufacture method using its Amorphous foil band

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4194553A (en) * 1978-06-05 1980-03-25 Hitachi, Ltd. Cooling and guide method and apparatus in a continuous casting machine
CH622725A5 (en) * 1977-08-26 1981-04-30 Erik Allan Olsson Method and apparatus for casting a metal band
WO1987002285A1 (en) * 1985-10-11 1987-04-23 National Aluminum Corporation Method of and apparatus for continuous casting of metal strip
US4842042A (en) * 1988-03-07 1989-06-27 Battelle Development Corporation Thickness control of direct cast strip

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH622725A5 (en) * 1977-08-26 1981-04-30 Erik Allan Olsson Method and apparatus for casting a metal band
US4194553A (en) * 1978-06-05 1980-03-25 Hitachi, Ltd. Cooling and guide method and apparatus in a continuous casting machine
WO1987002285A1 (en) * 1985-10-11 1987-04-23 National Aluminum Corporation Method of and apparatus for continuous casting of metal strip
US4842042A (en) * 1988-03-07 1989-06-27 Battelle Development Corporation Thickness control of direct cast strip

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0526360A1 (en) * 1991-07-31 1993-02-03 Pechiney Rhenalu Method to improve the surface quality and the regularity in thickness of thin cast metallic ribbons
FR2679803A1 (en) * 1991-07-31 1993-02-05 Pechiney Rhenalu PROCESS FOR IMPROVING THE SURFACE CONDITION AND THICKNESS REGULARITY OF A METALLIC SLIM BAND CASTING ON A WHEEL.
US5253699A (en) * 1991-07-31 1993-10-19 Pechiney Recherche Process for improving the surface condition and thickness regularity of a cast metal strip
EP0562984A1 (en) * 1992-03-26 1993-09-29 PECHINEY RECHERCHE (Groupement d'Intérêt Economique régi par l'Ordonnance du 23 Septembre 1967) Immeuble Balzac Thin deformable sheet made from an aluminium alloy having a fine and homogenous microstructure and a high elastic limit
FR2689141A1 (en) * 1992-03-26 1993-10-01 Pechiney Recherche Thin, deformable foil made of fine-grained and homogeneous aluminum alloy with high yield strength.
CN106938323A (en) * 2016-01-05 2017-07-11 株式会社日立产机系统 Amorphous foil band manufacture device and the manufacture method using its Amorphous foil band

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FR2665653A1 (en) 1992-02-14
AU8169591A (en) 1992-02-13
NO913061D0 (en) 1991-08-06
CA2048428A1 (en) 1992-02-09
NO913061L (en) 1992-02-10

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