EP0350345B1 - Method of and installation for continuous casting thin metallic products - Google Patents

Method of and installation for continuous casting thin metallic products Download PDF

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Publication number
EP0350345B1
EP0350345B1 EP89401576A EP89401576A EP0350345B1 EP 0350345 B1 EP0350345 B1 EP 0350345B1 EP 89401576 A EP89401576 A EP 89401576A EP 89401576 A EP89401576 A EP 89401576A EP 0350345 B1 EP0350345 B1 EP 0350345B1
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EP
European Patent Office
Prior art keywords
roller
cylinder
speed
wall
main cylinder
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EP89401576A
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German (de)
French (fr)
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EP0350345A1 (en
Inventor
Serge Heurtault
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Institut de Recherches de la Siderurgie Francaise IRSID
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Institut de Recherches de la Siderurgie Francaise IRSID
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Priority to AT89401576T priority Critical patent/ATE69565T1/en
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/111—Treating the molten metal by using protecting powders
    • 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
    • B22D11/0622—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by two casting wheels

Definitions

  • the present invention relates to the direct production of metal strips or sheets from molten metal, and more particularly to the production of strips or sheets of thin or very thin, in particular steel, by the technique known as continuous casting on a cylinder.
  • This known technique consists in casting the molten metal on the cooled side wall of a cylinder driven in rotation, the metal solidifying in contact with this wall, the strip thus formed being maintained in contact with the wall, on a part of the circumference thereof, to continue cooling.
  • the molten metal is commonly brought into contact with the wall of the cylinder by an open refractory channel, the end of which is flush with said wall.
  • the rotating cylinder drives in its movement the metal which solidifies progressively on contact.
  • the molten metal must also be contained in the supply channel at its upper part. This can be ensured by a fixed refractory upper wall linked to the channel as described in document US 4274471.
  • This document also reveals the use of a cooled roller joined with the end of this upper wall, this roller initiating the solidification of the upper skin of the product and limiting the thickness of the latter.
  • Document EP 0198669 also discloses the use for this purpose of a roller which is partially immersed in the liquid metal and driven in rotation.
  • the object of the present invention is to obtain, by a method of the type described above, a product which does not have these surface defects.
  • the object of the invention is a process for the continuous casting of thin products such as sheets or strips according to which the molten metal is brought into contact with the cooled wall of a main cylinder driven in rotation, the liquid metal being moreover contained by a roller of diameter less than that of the cylinder, driven in rotation, and kept at a distance from the wall of the main cylinder by a value substantially equal to the thickness of the cast product.
  • the roller is rotated at a speed such that its peripheral linear speed is greater than that of the cylinder.
  • the overspeed of the roller relative to that of the main cylinder is from 2 to 20%. Preferably, it is 6 to 10%.
  • the inventors have found that thanks to the implementation of the invention, the surface defects of the product obtained such as irregularity or flaking are eliminated, or at least greatly reduced.
  • the inventors have noted in particular that the aforementioned surface defects could be attributed to poor control of the trajectory of the strip or of the sheet metal just downstream of the "neck" between the main cylinder and the roller, the product then having a tendency not to remain in contact with the main cylinder, when it should do so over a certain circumferential distance from said neck to ensure uniformity of contact of the underside of the product with the cylinder.
  • the problem faced by the inventors was to precisely control the trajectory of the product poured from the neck to ensure the desired intimate contact with the main cylinder.
  • the inventors have been able to demonstrate, by experiments carried out in the case of steel casting in thin strips, that the strip naturally tends to "peel off” from the wall of the cylinder from the neck, this effect occurring at more or less large scale depending on the casting conditions, even if the strip is guided downstream of the neck by appropriate means.
  • the inventors have verified that the rotation drive of the cylinder, in the opposite direction to that of the main cylinder, and in peripheral linear overspeed with respect to the latter, makes it possible to ensure the practically perfect contact sought between the underside of the product and the main cylinder wall.
  • a device for the continuous casting of thin products of this type comprises a main cylinder driven in rotation and the side wall of which is cooled, a channel for supplying the molten metal on said wall of the cylinder, and a cooling roller placed parallel to the main cylinder and at a distance from the latter substantially equal to the thickness desired for the product, this roller at least partially closing off the upper zone of the end of the supply channel.
  • the device further comprises means for driving the roller in rotation at a speed adjustable independently of the speed of the main cylinder to adjust the peripheral linear speed of the cylinder. to a value greater than that of the peripheral linear speed of the main cylinder.
  • the installation comprises a main cylinder 1 driven in rotation in the direction of arrow F1 by a motor 2.
  • the rotation speed can be adjustable to adapt to various casting conditions.
  • the cylinder 1 has a side wall 11 cooled in a conventional manner, for example by internal circulation of a cooling fluid.
  • a roller 3 is arranged parallel to the cylinder and at a distance from the latter substantially equal to the desired thickness of the metal strip 10. The side wall of this roller is also cooled. The roller 3 is rotated in the direction of the arrow F2 by a motor 4 and its speed can be adjusted by the adjustment means 5.
  • the roller 3 is positioned relative to the cylinder 1 in a sector of angle ⁇ of between 0 and 45 ° relative to the vertical.
  • a minimal clearance is provided between the end 61 of this channel and the wall of the cylinder to avoid wear thereof while avoiding liquid metal leaks.
  • an upper wall 62 of the channel is attached to the roller 3. This wall is however not necessary if the position of the surface of the liquid metal 7 can be controlled so as not to overflow above said roller.
  • a scraper 8 is disposed near the cylinder 1 at the point where the solidified strip 10 moves away from the cylinder, to guide the latter.
  • the diameter of cylinder 1 is 660 mm and that of roller 3 is 200 mm. These values are given for information only and it is understood that the diameters may be different from the above values.
  • the ratio between the respective diameters of the cylinder and the roller can also be changed.
  • the diameter of the roller will however preferably be less than that of the cylinder.
  • the cylinder and the roller are rotated.
  • the liquid metal 7 is brought into the channel 6 and its level is preferably maintained slightly below the axis of the roller.
  • the linear peripheral speed of the roller 3 is adjusted to be greater than that of the cylinder 1.
  • the speed difference is preferably of the order of 6 to 10%, but can range from 2 to 20%.
  • the molten metal 7 solidifies and forms on each of the cooled surfaces a solidified skin whose thickness increases in the direction of casting.
  • the roller 3 is of smaller diameter than that of the cylinder 1.
  • the side walls of the cylinder and of the roller are of the same nature (copper wall) and the cooling of these is such that the heat exchange conditions at their surfaces are similar.
  • the skin 10 ′ formed on the cylinder 1 has a thickness greater than that 10 ⁇ formed on the roller 3.
  • the two skins 10 ′ and 10 ⁇ meet substantially at the level of the neck between cylinder and roller.
  • the device and the method according to the invention make it possible to obtain a product, sheet or strip, having a good surface condition, without the defects observed previously.
  • the invention is not limited to the device and method described above by way of example.
  • the relative position of the roller relative to the cylinder can also be modified, the angle can take any value.
  • the overspeed must be adapted according to the casting conditions, the respective coolings of the cylinder and the roller, the nature and the surface condition of these, as well as their possible lubrication.
  • the method is applicable to the casting of metals other than steel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Measuring Or Testing Involving Enzymes Or Micro-Organisms (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Forging (AREA)

Abstract

Method of continuous casting thin metallic products such as sheets or strips, according to which the molten metal is brought into contact with the cooled wall of a main roll (1) driven in rotation, the liquid metal (7) additionally being contained by a roller (3) of smaller diameter than that of the roll, which is driven in rotation and maintained at a distance from the wall of the main roll with a value substantially equal to the thickness of the cast product (10). <??>The roller (3) is driven in rotation at a greater peripheral speed than that of the roll (1). <??>The installation for carrying out the method comprises means (4, 5) for driving in rotation the roller (3) at a speed which is adjustable independently of the speed of the main roll. <IMAGE>

Description

La présente invention concerne la production directe de bandes ou tôles métalliques à partir du métal en fusion, et plus particulièrement la production de bandes ou tôles de faible ou très faible épaisseur, notamment en acier, par la technique dite de coulée continue sur un cylindre.The present invention relates to the direct production of metal strips or sheets from molten metal, and more particularly to the production of strips or sheets of thin or very thin, in particular steel, by the technique known as continuous casting on a cylinder.

Cette technique connue consiste à couler le métal en fusion sur la paroi latérale refroidie d'un cylindre entraîné en rotation, le métal se solidifiant au contact de cette paroi, la bande ainsi formée étant maintenue au contact de la paroi, sur une partie de la circonférence de celle-ci, pour poursuivre son refroidissement. Le métal en fusion est couramment amené au contact de la paroi du cylindre par un canal réfractaire ouvert dont l'extrémité affleure ladite paroi. Le cylindre en rotation entraîne dans son mouvement le métal qui se solidifie progressivement à son contact.This known technique consists in casting the molten metal on the cooled side wall of a cylinder driven in rotation, the metal solidifying in contact with this wall, the strip thus formed being maintained in contact with the wall, on a part of the circumference thereof, to continue cooling. The molten metal is commonly brought into contact with the wall of the cylinder by an open refractory channel, the end of which is flush with said wall. The rotating cylinder drives in its movement the metal which solidifies progressively on contact.

Le métal en fusion doit par ailleurs être contenu dans le canal d'alimentation à sa partie supérieure. Ceci peut être assuré par une paroi supérieure réfractaire fixe liée au canal ainsi que décrit dans le document US 4274471.The molten metal must also be contained in the supply channel at its upper part. This can be ensured by a fixed refractory upper wall linked to the channel as described in document US 4274471.

Ce document révèle également l'utilisation d'un rouleau refroidi jointif avec l'extrémité de cette paroi supérieure, ce rouleau initiant la solidification de la peau supérieure du produit et limitant l'épaisseur de celui-ci.This document also reveals the use of a cooled roller joined with the end of this upper wall, this roller initiating the solidification of the upper skin of the product and limiting the thickness of the latter.

Le document EP 0198669 révèle également l'utilisation à cette fin d'un rouleau qui est partiellement immergé dans le métal liquide et entraîné en rotation.Document EP 0198669 also discloses the use for this purpose of a roller which is partially immersed in the liquid metal and driven in rotation.

Il a toutefois été constaté que les produits obtenus par des procédés de ce type présentent un état de surface de qualité insuffisante. La surface est granuleuse si la solidification s'effectue uniquement à partir du cylindre principal de coulée, et l'utilisation d'un second rouleau ou cylindre de plus faible diamètre conduit à une surface du produit écaillée.However, it has been found that the products obtained by processes of this type have an insufficient quality surface finish. The surface is grainy if the solidification takes place only from the main casting cylinder, and the use of a second roller or cylinder of smaller diameter leads to a chipped surface of the product.

Le but de la présente invention est d'obtenir par un procédé du type décrit ci-avant, un produit ne présentant pas ces défauts de surface.The object of the present invention is to obtain, by a method of the type described above, a product which does not have these surface defects.

Avec cet objectif en vue, l'objet de l'invention est un procédé de coulée continue de produits minces tels que tôles ou bandes selon lequel le métal en fusion est amené au contact de la paroi refroidie d'un cylindre principal entraîné en rotation, le métal liquide étant par ailleurs contenu par un rouleau de diamètre inférieur à celui du cylindre, entraîné en rotation, et maintenu à distance de la paroi du cylindre principal d'une valeur sensiblement égale à l'épaisseur du produit coulé.With this objective in view, the object of the invention is a process for the continuous casting of thin products such as sheets or strips according to which the molten metal is brought into contact with the cooled wall of a main cylinder driven in rotation, the liquid metal being moreover contained by a roller of diameter less than that of the cylinder, driven in rotation, and kept at a distance from the wall of the main cylinder by a value substantially equal to the thickness of the cast product.

Conformément à l'invention, le rouleau est entraîné en rotation à une vitesse telle que sa vitesse linéaire périphérique soit supérieure à celle du cylindre.According to the invention, the roller is rotated at a speed such that its peripheral linear speed is greater than that of the cylinder.

Selon une disposition particulière de l'invention, la survitesse du rouleau par rapport à celle du cylindre principal est de 2 à 20%. Préférentiellement, elle est de 6 à 10%.According to a particular arrangement of the invention, the overspeed of the roller relative to that of the main cylinder is from 2 to 20%. Preferably, it is 6 to 10%.

Les inventeurs ont constaté que grâce à la mise en oeuvre de l'invention, les défauts de surface du produit obtenu tels que irrégularité ou écaillage sont supprimés, ou tout au moins fortement réduits.The inventors have found that thanks to the implementation of the invention, the surface defects of the product obtained such as irregularity or flaking are eliminated, or at least greatly reduced.

Les inventeurs ont notamment constaté que les défauts de surface prémentionnés pouvaient être imputés à une mauvaise maîtrise de la trajectoire de la bande ou de la tôle juste en aval du "col" entre cylindre principal et rouleau, le produit ayant alors tendance à ne pas rester en contact avec le cylindre principal, alors qu'il devrait le faire sur une certaine distance circonférentielle à partir dudit col pour assurer l'uniformité du contact de la face inférieure du produit avec le cylindre. Le problème qui s'est posé aux inventeurs était de contrôler précisément la trajectoire du produit coulé dès le col pour assurer le contact intime recherché avec le cylindre principal.The inventors have noted in particular that the aforementioned surface defects could be attributed to poor control of the trajectory of the strip or of the sheet metal just downstream of the "neck" between the main cylinder and the roller, the product then having a tendency not to remain in contact with the main cylinder, when it should do so over a certain circumferential distance from said neck to ensure uniformity of contact of the underside of the product with the cylinder. The problem faced by the inventors was to precisely control the trajectory of the product poured from the neck to ensure the desired intimate contact with the main cylinder.

Il doit être compris que l'utilisation d'un second rouleau ou d'une série de rouleaux destinés à guider le produit, tels que montrés par le document US 4274471 précité, ne permet pas de résoudre ce problème car même si lesdits rouleaux sont rapprochés, il subsiste impérativement une certaine distance entre les points de contact du premier et du second rouleau, distance sur laquelle le maintien du produit en contact parfait avec le cylindre principal ne peut être assuré.It should be understood that the use of a second roller or of a series of rollers intended to guide the product, as shown by the document US 4274471 cited above, does not make it possible to solve this problem because even if said rollers are brought together , there is necessarily a certain distance between the contact points of the first and second roll, a distance over which the maintenance of the product in perfect contact with the main cylinder cannot be ensured.

Les inventeurs ont pu mettre en évidence, par des expériences menées dans le cas de la coulée d'acier en bandes minces, que la bande a naturellement tendance à se "décoller" de la paroi du cylindre dès le col, cet effet se produisant à plus ou moins grande échelle selon les conditions de coulée, et cela même si la bande est guidée en aval du col par des moyens appropriés.The inventors have been able to demonstrate, by experiments carried out in the case of steel casting in thin strips, that the strip naturally tends to "peel off" from the wall of the cylinder from the neck, this effect occurring at more or less large scale depending on the casting conditions, even if the strip is guided downstream of the neck by appropriate means.

Il apparaît en fait que c'est essentiellement la peau supérieure du produit qui a tendance à rester au contact du rouleau supérieur en aval du col, ce qui tend en conséquence à décoller la peau inférieure du cylindre.It appears in fact that it is essentially the upper skin of the product which tends to remain in contact with the upper roller downstream of the neck, which consequently tends to peel off the lower skin of the cylinder.

Les inventeurs ont vérifié que l'entraînement en rotation du cylindre, en sens opposé à celui du cylindre principal, et en survitesse linéaire périphérique par rapport à ce dernier, permettait d'assurer le contact pratiquement parfait recherché entre la face inférieure du produit et la paroi du cylindre principal.The inventors have verified that the rotation drive of the cylinder, in the opposite direction to that of the main cylinder, and in peripheral linear overspeed with respect to the latter, makes it possible to ensure the practically perfect contact sought between the underside of the product and the main cylinder wall.

Il est rappelé que, dans ce type de coulée, il se forme un puits liquide contenu entre deux peaux en cours de solidification. Une peau inférieure, d'épaisseur croissante à partir du point de premier contact du métal liquide avec le cylindre, se forme sur le cylindre principal, et une peau supérieure se forme de la même manière au contact du rouleau. Il est connu de rechercher un positionnement du fond du puits liquide sensiblement au niveau du col, pour éviter, d'une part, un laminage du produit, et les efforts importants en résultant sur les cylindres et rouleau, dans le cas d'un fond de puits en amont du col, et d'autre part, des risques de percées dans le cas d'un fond de puits en aval du col.It is recalled that, in this type of casting, a liquid well is formed contained between two skins in the course of solidification. A lower skin, of increasing thickness from the point of first contact of the liquid metal with the cylinder, is formed on the main cylinder, and an upper skin is formed in the same way in contact with the roller. It is known to seek a positioning of the bottom of the liquid well substantially at the level of the neck, to avoid, on the one hand, a rolling of the product, and the significant efforts resulting therefrom on the cylinders and roller, in the case of a bottom wells upstream of the neck, and secondly, risks of breakthroughs in the case of a well bottom downstream of the neck.

Lors des expériences menées par les inventeurs, ceux-ci ont constaté que, pour une survitesse périphérique du rouleau par rapport au cylindre inférieur à environ 2%, cette faible survitesse était insuffisante pour que la tendance à une survitesse de la peau supérieure par rapport à la peau inférieure, provoque, par l'effet du couplage mécanique réalisé entre les deux peaux au fond du puits liquide, le rabattement du produit vers le bas contre le cylindre principal.During the experiments carried out by the inventors, they found that, for a peripheral overspeed of the roller with respect to the cylinder of less than about 2%, this low overspeed was insufficient for the tendency to overspeed of the skin greater than the lower skin, by the effect of the mechanical coupling produced between the two skins at the bottom of the liquid well, causes the product to fold down against the main cylinder.

A l'inverse, pour une même vitesse du cylindre et pour une même épaisseur du produit, et bien qu'en toute rigueur, une survitesse importante puisse être réalisée, si celle-ci est supérieure à environ 20%, le fond du puits liquide risque de se trouver déplacé trop en aval du col, ceci pouvant être dû notamment à une peau trop fine formée sur le rouleau supérieur. Les deux peaux ne sont plus alors en bon contact mutuel et ont tendance à ne pas suivre une trajectoire commune.Conversely, for the same speed of the cylinder and for the same thickness of the product, and although strictly speaking, a significant overspeed can be achieved, if it is greater than about 20%, the bottom of the liquid well risk of being moved too far downstream of the neck, this may be due in particular to too thin skin formed on the upper roller. The two skins are no longer in good mutual contact and tend not to follow a common trajectory.

Il sera bien compris que la survitesse relative du rouleau par rapport au cylindre n'a pas pour effet de provoquer une survitesse équivalente de la peau supérieure du produit par rapport à sa peau inférieure. Il y a en fait un effet de patinage du rouleau sur la peau supérieure qui tend à "pousser" la peau supérieure dans le sens d'extraction du produit. Ce patinage tend à croître avec la survitesse, la poussée sur la peau supérieure croissant simultanément. Toutefois, il est clair que la différence de vitesse entre le rouleau supérieur et la peau qui s'y forme ne dépend pas que de la seule survitesse, mais également d'autres paramètres influant sur le "couplage" mécanique entre le rouleau et la peau supérieure du produit, tels que l'état de surface du rouleau, sa rugosité, sa propreté, etc.It will be clearly understood that the relative overspeed of the roller with respect to the cylinder does not have the effect of causing equivalent overspeed of the upper skin of the product relative to its lower skin. There is in fact a skating effect of the roller on the upper skin which tends to "push" the upper skin in the direction of extraction of the product. This skating tends to grow with overspeed, the push on the upper skin increasing simultaneously. However, it is clear that the difference in speed between the upper roller and the skin that forms there does not only depend on overspeed alone, but also on other parameters influencing the mechanical "coupling" between the roller and the skin. product, such as the surface condition of the roller, its roughness, cleanliness, etc.

Un autre objet de l'invention est un dispositif de mise en oeuvre du procédé ci-dessus. Un dispositif de coulée continue de produits minces de ce type comprend un cylindre principal entraîné en rotation et dont la paroi latérale est refroidie, un canal d'amenée du métal liquide sur ladite paroi du cylindre, et un rouleau refroidissant placé parallèlement au cylindre principal et à une distance de celui-ci sensiblement égale à l'épaisseur souhaitée pour le produit, ce rouleau obturant au moins partiellement la zone supérieure de l'extrémité du canal d'amenée.Another object of the invention is a device for implementing the above method. A device for the continuous casting of thin products of this type comprises a main cylinder driven in rotation and the side wall of which is cooled, a channel for supplying the molten metal on said wall of the cylinder, and a cooling roller placed parallel to the main cylinder and at a distance from the latter substantially equal to the thickness desired for the product, this roller at least partially closing off the upper zone of the end of the supply channel.

Conformément à l'invention, le dispositif comprend en outre des moyens d'entraînement en rotation du rouleau à une vitesse réglable indépendamment de la vitesse du cylindre principal pour régler la vitesse linéaire périphérique du cylindre à une valeur supérieure à celle de la vitesse linéaire périphérique du cylindre principal.According to the invention, the device further comprises means for driving the roller in rotation at a speed adjustable independently of the speed of the main cylinder to adjust the peripheral linear speed of the cylinder. to a value greater than that of the peripheral linear speed of the main cylinder.

D'autres avantages et caractéristiques de l'invention apparaîtront à la lecture de la description qui va être faite à titre d'exemple d'un procédé et dispositif conforme à l'invention.Other advantages and characteristics of the invention will appear on reading the description which will be given by way of example of a method and device in accordance with the invention.

On se reportera à l'unique figure annexée qui représente schématiquement une installation de coulée continue de bandes minces en acier.Reference will be made to the single appended figure which schematically represents an installation for the continuous casting of thin strips of steel.

L'installation comporte un cylindre principal 1 entraîné en rotation dans le sens de la flèche F1 par un moteur 2. La vitesse de rotation peut être réglable pour s'adapter à diverses conditions de coulée. Le cylindre 1 a une paroi latérale 11 refroidie de manière classique, par exemple par circulation interne d'un fluide refroidissant.The installation comprises a main cylinder 1 driven in rotation in the direction of arrow F1 by a motor 2. The rotation speed can be adjustable to adapt to various casting conditions. The cylinder 1 has a side wall 11 cooled in a conventional manner, for example by internal circulation of a cooling fluid.

Un rouleau 3 est disposé parallèlement au cylindre et à une distance de celui-ci sensiblement égale à l'épaisseur recherchée de la bande métallique 10. La paroi latérale de ce rouleau est également refroidie. Le rouleau 3 est entraîné en rotation dans le sens de la flèche F2 par un moteur 4 et sa vitesse peut être réglée par les moyens de réglage 5.A roller 3 is arranged parallel to the cylinder and at a distance from the latter substantially equal to the desired thickness of the metal strip 10. The side wall of this roller is also cooled. The roller 3 is rotated in the direction of the arrow F2 by a motor 4 and its speed can be adjusted by the adjustment means 5.

Le rouleau 3 est positionné par rapport au cylindre 1 dans un secteur d'angle α compris entre 0 et 45° par rapport à la verticale.The roller 3 is positioned relative to the cylinder 1 in a sector of angle α of between 0 and 45 ° relative to the vertical.

Un canal 6 d'amenée du métal liquide, en matériau réfractaire, est accolé au cylindre 1. Un jeu minimal est ménagé entre l'extrémité 61 de ce canal et la paroi du cylindre pour éviter l'usure de celle-ci tout en évitant les fuites de métal liquide.A channel 6 for supplying the liquid metal, made of refractory material, is attached to the cylinder 1. A minimal clearance is provided between the end 61 of this channel and the wall of the cylinder to avoid wear thereof while avoiding liquid metal leaks.

De même, une paroi supérieure 62 du canal est accolée au rouleau 3. Cette paroi n'est toutefois pas nécessaire si la position de la surface du métal liquide 7 peut être contrôlée de manière à ne pas déborder au-dessus dudit rouleau.Similarly, an upper wall 62 of the channel is attached to the roller 3. This wall is however not necessary if the position of the surface of the liquid metal 7 can be controlled so as not to overflow above said roller.

Un racleur 8 est disposé à proximité du cylindre 1 au point où la bande 10 solidifiée s'écarte du cylindre, pour guider celle-ci.A scraper 8 is disposed near the cylinder 1 at the point where the solidified strip 10 moves away from the cylinder, to guide the latter.

A titre d'exemple, la bande 10 réalisée sur une installation expérimentale a une épaisseur d'environ 1 mm. Le diamètre du cylindre 1 est de 660 mm et celui du rouleau 3 de 200 mm. Ces valeurs sont données à titre indicatif et il est bien entendu que les diamètres peuvent être différents des valeurs ci-dessus. Le rapport entre les diamètres respectifs du cylindre et du rouleau peut aussi être modifié. Le diamètre du rouleau sera cependant préférentiellement inférieur à celui du cylindre.By way of example, the strip 10 produced on an installation thickness of about 1 mm. The diameter of cylinder 1 is 660 mm and that of roller 3 is 200 mm. These values are given for information only and it is understood that the diameters may be different from the above values. The ratio between the respective diameters of the cylinder and the roller can also be changed. The diameter of the roller will however preferably be less than that of the cylinder.

Lors de la coulée, le cylindre et le rouleau sont entraînés en rotation. Le métal liquide 7 est amené dans le canal 6 et son niveau est maintenu de préférence légèrement en dessous de l'axe du rouleau.During casting, the cylinder and the roller are rotated. The liquid metal 7 is brought into the channel 6 and its level is preferably maintained slightly below the axis of the roller.

La vitesse périphérique linéaire du rouleau 3 est réglée pour être supérieure à celle du cylindre 1. L'écart de vitesse est de l'ordre de 6 à 10% de préférence, mais peut aller de 2 à 20%.The linear peripheral speed of the roller 3 is adjusted to be greater than that of the cylinder 1. The speed difference is preferably of the order of 6 to 10%, but can range from 2 to 20%.

Au contact des parois refroidies du cylindre 1 et du rouleau 3, le métal en fusion 7 se solidifie et forme sur chacune des surfaces refroidies une peau solidifiée dont l'épaisseur croît dans le sens de coulée. Dans le cas de l'exemple précité, le rouleau 3 est de diamètre inférieur à celui du cylindre 1. Les parois latérales du cylindre et du rouleau sont de même nature (paroi en cuivre) et le refroidissement de celles-ci est tel que les conditions d'échange thermique à leurs surfaces sont similaires. De ce fait, et parce que, dans le présent exemple, la longueur jusqu'au col de l'arc de contact du métal coulé avec le rouleau 3 est inférieure à la longueur correspondante avec le cylindre 1, aussi parce que la vitesse linéaire périphérique du rouleau 3 est supérieure à celle du cylindre 1, la durée de contact du métal coulé avec la paroi du rouleau est inférieure à la durée de contact avec le cylindre. En conséquence, la peau 10′ formée sur le cylindre 1 a une épaisseur supérieure à celle 10˝ formée sur le rouleau 3. Les deux peaux 10′ et 10˝ se rejoignent sensiblement au niveau du col entre cylindre et rouleau.On contact with the cooled walls of the cylinder 1 and of the roller 3, the molten metal 7 solidifies and forms on each of the cooled surfaces a solidified skin whose thickness increases in the direction of casting. In the case of the above example, the roller 3 is of smaller diameter than that of the cylinder 1. The side walls of the cylinder and of the roller are of the same nature (copper wall) and the cooling of these is such that the heat exchange conditions at their surfaces are similar. Therefore, and because, in the present example, the length to the neck of the arc of contact of the metal cast with the roller 3 is less than the corresponding length with the cylinder 1, also because the peripheral linear speed of the roller 3 is greater than that of the cylinder 1, the duration of contact of the cast metal with the wall of the roller is less than the duration of contact with the cylinder. Consequently, the skin 10 ′ formed on the cylinder 1 has a thickness greater than that 10˝ formed on the roller 3. The two skins 10 ′ and 10˝ meet substantially at the level of the neck between cylinder and roller.

Il doit être cependant bien compris qu'il n'y a pas une limite précise entre peaux et métal liquide, le métal passant progressivement de l'état liquide à l'état solide par une zone pâteuse. La position de cette zone peut être ajustée en jouant notamment sur les vitesses de rotation du cylindre et du rouleau ou sur l'intensité du refroidissement des parois du cylindre et du rouleau. On visera à obtenir un produit solidifié dans toute sa section en aval du col.It must be understood, however, that there is not a precise limit between skins and liquid metal, the metal passing gradually from liquid to solid state through a pasty area. The position of this zone can be adjusted by playing in particular on the speeds of rotation of the cylinder and the roller or on the intensity of the cooling of the walls of the cylinder and the roller. We will aim to obtain a solidified product throughout its section downstream of the neck.

Le dispositif et le procédé selon l'invention permettent d'obtenir un produit, tôle ou bande, présentant un bon état de surface, sans les défauts observés antérieurement.The device and the method according to the invention make it possible to obtain a product, sheet or strip, having a good surface condition, without the defects observed previously.

L'invention n'est pas limitée au dispositif et procédé décrit ci-avant à titre d'exemple.The invention is not limited to the device and method described above by way of example.

On pourra notamment utiliser un moteur unique d'entraînement pour le cylindre et le rouleau en interposant entre ceux-ci un variateur de vitesse, la vitesse de coulée pouvant par exemple être réglée de quelques dizaines à plusieurs centaines de mètres par minute.In particular, it will be possible to use a single drive motor for the cylinder and the roller, interposing a speed variator therebetween, the casting speed being able for example to be adjusted from a few tens to several hundred meters per minute.

La position relative du rouleau par rapport au cylindre pourra également être modifiée, l'angle pouvant prendre une valeur quelconque.The relative position of the roller relative to the cylinder can also be modified, the angle can take any value.

De même, la survitesse devra être adaptée en fonction des conditions de coulée, des refroidissements respectifs du cylindre et du rouleau, de la nature et de l'état de surface de ceux-ci, ainsi que de leur éventuelle lubrification.Likewise, the overspeed must be adapted according to the casting conditions, the respective coolings of the cylinder and the roller, the nature and the surface condition of these, as well as their possible lubrication.

Bien entendu, le procédé est applicable à la coulée d'autres métaux que l'acier.Of course, the method is applicable to the casting of metals other than steel.

Claims (4)

1. Method for the continuous casting of thin products, such as sheets or strips, wherein the molten metal is brought into contact with the cooled wall of a rotationally driven main cylinder, the molten metal being in addition retained by a rotationally driven roller whose diameter is smaller than that of the cylinder and which is held at a distance, from the wall of the main cylinder, substantially equal to the thickness of the cast product, and the speeds of the cylinder (1) and of the roller (3) are regulated so that the bottom of the liquid pool is substantially at the neck between the cylinder and the roller, said method being characterised in that the roller (3) is driven rotationally at a speed such that its linear peripheral speed is higher than that of the cylinder (1).
2. Method according to Claim 1, characterised in that the excess peripheral speed of the roller (3) above that of the cylinder (1) amounts to 2 to 20%.
3. Apparatus for the continuous casting of thin products, comprising a rotationally driven main cylinder whose side wall is cooled, a channel feeding molten metal onto said wall of the cylinder, and a cooling roller disposed parallel to the main cylinder at a distance from the latter substantially equal to the desired thickness of the product, this roller at least partially closing the top zone of the end of the feed channel, said apparatus being characterised in that it is provided with means (4, 5) for rotationally driving the roller (3) at a speed adjustable independently of the speed of the main cylinder (1).
4. Apparatus according to Claim 3, characterised in that the roller (3) is situated, relative to the cylinder (1), in a sector of an angle (α) between 0 and 45° relative to the vertical.
EP89401576A 1988-07-06 1989-06-07 Method of and installation for continuous casting thin metallic products Expired - Lifetime EP0350345B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89401576T ATE69565T1 (en) 1988-07-06 1989-06-07 METHOD AND DEVICE FOR CONTINUOUS CASTING OF THIN METALLIC PRODUCTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809275A FR2633852B1 (en) 1988-07-06 1988-07-06 METHOD AND DEVICE FOR CONTINUOUSLY CASTING THIN METAL PRODUCTS
FR8809275 1988-07-06

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EP0350345A1 EP0350345A1 (en) 1990-01-10
EP0350345B1 true EP0350345B1 (en) 1991-11-21

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US (1) US5083603A (en)
EP (1) EP0350345B1 (en)
JP (1) JPH0263651A (en)
KR (1) KR900001442A (en)
CN (1) CN1017319B (en)
AT (1) ATE69565T1 (en)
AU (1) AU608451B2 (en)
BR (1) BR8903329A (en)
DD (1) DD283961A5 (en)
DE (1) DE68900449D1 (en)
ES (1) ES2027455T3 (en)
FI (1) FI86693C (en)
FR (1) FR2633852B1 (en)
GR (1) GR3003868T3 (en)
RU (1) RU1774897C (en)
ZA (1) ZA894772B (en)

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CN100540179C (en) * 2004-09-20 2009-09-16 北京航空航天大学 A kind of rapid solidification prepares the method for amorphous thin ribbon
JP5083862B2 (en) * 2006-12-13 2012-11-28 株式会社神戸製鋼所 Clad metal plate manufacturing method
JP4672745B2 (en) * 2008-03-11 2011-04-20 三菱日立製鉄機械株式会社 Twin drum type continuous casting equipment and continuous casting method
US8701745B2 (en) * 2009-11-06 2014-04-22 Mitek Holdings, Inc. Continuous casting of lead alloy strip for heavy duty battery electrodes
CN108290212A (en) * 2015-11-30 2018-07-17 新日铁住金株式会社 The manufacturing device of metal sheet band and the manufacturing method for using its metal sheet band carried out

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JPS6038225B2 (en) * 1977-09-12 1985-08-30 ソニー株式会社 Manufacturing method of amorphous alloy
JPS5938062B2 (en) * 1978-03-15 1984-09-13 日本碍子株式会社 Continuous metal casting method
US4450891A (en) * 1980-09-02 1984-05-29 Allied Corporation Method of and apparatus for continuous casting using an auxiliary graphite chill roll
JPS58212844A (en) * 1982-06-04 1983-12-10 Mitsubishi Heavy Ind Ltd Continuous casting device for thin plate
JPS5913551A (en) * 1982-07-15 1984-01-24 Nippon Kokan Kk <Nkk> Continuous casting device of steel plate
CH666842A5 (en) * 1984-03-01 1988-08-31 Concast Service Union Ag METHOD AND DEVICE FOR CONTINUOUSLY CASTING METALS IN THE FORM OF BAND BETWEEN TWO COOLED AXLE-PARALLEL DRUM.
JPS61253149A (en) * 1985-04-12 1986-11-11 Nippon Kinzoku Kogyo Kk Apparatus for producing thin metallic sheet by continuous casting
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Also Published As

Publication number Publication date
US5083603A (en) 1992-01-28
DD283961A5 (en) 1990-10-31
FI893299A (en) 1990-01-07
DE68900449D1 (en) 1992-01-02
FR2633852B1 (en) 1991-04-26
FI86693B (en) 1992-06-30
FI893299A0 (en) 1989-07-06
AU608451B2 (en) 1991-03-28
CN1039547A (en) 1990-02-14
ES2027455T3 (en) 1992-06-01
AU3675289A (en) 1990-01-11
RU1774897C (en) 1992-11-07
BR8903329A (en) 1990-02-13
ATE69565T1 (en) 1991-12-15
CN1017319B (en) 1992-07-08
KR900001442A (en) 1990-02-27
FI86693C (en) 1992-10-12
EP0350345A1 (en) 1990-01-10
JPH0263651A (en) 1990-03-02
ZA894772B (en) 1990-03-28
GR3003868T3 (en) 1993-03-16
FR2633852A1 (en) 1990-01-12

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