EP0477045A1 - Apparatus for twin-roll continuous casting - Google Patents

Apparatus for twin-roll continuous casting Download PDF

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Publication number
EP0477045A1
EP0477045A1 EP91402212A EP91402212A EP0477045A1 EP 0477045 A1 EP0477045 A1 EP 0477045A1 EP 91402212 A EP91402212 A EP 91402212A EP 91402212 A EP91402212 A EP 91402212A EP 0477045 A1 EP0477045 A1 EP 0477045A1
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EP
European Patent Office
Prior art keywords
installation according
disc
cylinders
casting
disc portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91402212A
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German (de)
French (fr)
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EP0477045B1 (en
Inventor
Jean-Pierre Birat
Philippe Blin
Christophe Ganser
Yves Grandgenevre
Jean-Luc Jacquot
Jacques Spiquel
Laurent Sosin
Jean-Bernard Veyret
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Thyssen Stahl AG
USINOR SA
Original Assignee
Thyssen Edelstahlwerke AG
Thyssen Stahl AG
USINOR Sacilor SA
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Application filed by Thyssen Edelstahlwerke AG, Thyssen Stahl AG, USINOR Sacilor SA filed Critical Thyssen Edelstahlwerke AG
Publication of EP0477045A1 publication Critical patent/EP0477045A1/en
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Publication of EP0477045B1 publication Critical patent/EP0477045B1/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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/0648—Casting surfaces
    • B22D11/066—Side dams

Definitions

  • the present invention relates to the continuous casting of metals, in particular steel, between two cylinders of parallel axes driven in rotation in opposite directions, to obtain thin products.
  • a side wall comprising at least one lateral part, for example metallic, facing the planar front surface of a cylinder, and of which the surface opposite the casting space is an extension of the surface of said cylinder, and is connects to a front part of said wall, recessed therein with respect to the side part, so as to form in the wall a hollow zone laterally extending the casting space.
  • the present invention proposes to provide another solution to the problem mentioned above.
  • the invention relates to a continuous casting installation between two cylinders with parallel axes defining between them and with two fixed side walls a casting space for a molten metal, each side wall comprising at least a lateral part, placed against the flat front end surface of one of the cylinders, and consisting of a disc portion of outside diameter equal to that of said adjacent cylinder, and a central part, opposite said casting space, in insulating refractory material,
  • said installation being, according to the invention, characterized in that said disc portion is made of a material having good thermal conductivity and mechanical resistance characteristics superior to those of said refractory material. and is a portion of frustoconical disc whose face having the greatest radius of curvature is situated towards the cylinder, and the frustoconical surface is in contact with the insulating material of said central part.
  • the disc portion opposite the front end surface of the cylinder is resistant to friction, it can be pressed against the cylinder with sufficient force to ensure sealing, without risk of deterioration or wear.
  • the central part in insulating material avoids an excessive solidification of the metal and the formation of the corner mentioned at the beginning of this thesis. During casting, this central part can be worn by the metal which digs it, but in doing so the metal which penetrates into the hollow thus formed approaches the frustoconical surface of the disc portion, kept at low temperature among other things due to its thermal conductivity and its proximity to the cooled surfaces of the cylinders.
  • this metal solidifies on the surface, the wall thus solidified hooks into the insulating refractory material and forms a sort of slide in which the liquid metal can flow to the level of the neck between the cylinders, where, solidified, it constitutes the edge of the product.
  • the constitution of the side wall according to the invention makes it possible, at the start of casting, to form an autocreuset, constituted by the skin of metal solidified in the insulating refractory material, which stabilizes due to the proximity of the disc portions, thus prevents the progression of wear of said refractory material, and thus allows the continuation of the casting.
  • the horizontal section of this self-crucible near the neck takes a C shape whose thickness of the branches decreases towards their ends, so that the spacing between these branches is substantially constant, which makes it possible to obtain the edges of the cast product of thickness substantially equal to the thickness of the central zone thereof.
  • the frustoconical surface of the disc portion may include asperities, such as spikes, which improve the attachment of the insulating material and therefore the maintenance of the autocreuset on its edges.
  • the central part of insulating refractory material can be made up of several of these materials arranged in successive layers having characteristics of mechanical resistance and / or thermal insulation varying gradually from the material located towards the casting space. , which has the highest insulation coefficient.
  • the disc portions may be coated or made of a material resistant to heat and having in particular good mechanical strength at high temperature, such as zirconia, and more can be cooled, by example by an internal circulation of a cooling fluid.
  • the continuous casting installation between cylinders partially shown in FIG. 1, comprises two cylinders 1 and 2 with parallel and horizontal axes, driven in rotation and two lateral walls for closing the casting space, such as wall 3 , located towards the ends of the cylinders and held against the front surfaces 4, 5 of the cylinders.
  • the side wall 3 shown in Figure 1 in section along a horizontal plane at the axes of the cylinders and in front view in Figure 2, has two side parts 6 each consisting of a portion of frustoconical disc of larger outside diameter equal to that of the cylinders, so that the face 7 of these portions of discs having the greatest radius of curvature is situated against the front surface 4, 5 of the adjacent cylinder, and that the edge 9 of the bevel formed by the frustoconical surface 8 and the face 7 of these disc portions is opposite the edge formed by the edge of the cylindrical surface 10 of the corresponding cylinder.
  • the angle of the bevel that is to say the angle at the base of the tapered disc portion is 5 to 85 degrees, and preferably about 30 °.
  • the disc portions constituting the lateral parts 6 of the closure wall 3 are made of a material having good mechanical characteristics, resistant to wear, and preferably having a low coefficient of friction to limit the forces due to the possible friction of the cylinders on these portions of discs. We could for example make them out of cast iron, steel, copper, and reduce friction by lubrication.
  • the mechanical strength of the material constituting the disc portions also makes it possible to avoid the deterioration of these if, following the wear of the insulating refractory, the cast metal, in the course of solidification, comes into contact with them. The progression of wear is stopped or at least greatly slowed down, and metal infiltration between these disc portions and the cylinders is thus avoided.
  • the disc portions 6 may also, in the vicinity of the edge 9, be coated or made of a material having a particularly high mechanical resistance at high temperature and preferably unlikely to be wetted by the molten molten metal, and inert to the contact of the liquid steel to avoid deterioration of the edges 9 of the disc portions, or the attachment of cast metal thereon, in the event that molten metal is brought, during casting, into contact with said edges. It is possible, for example, to use a ceramic deposit (for example zirconia) on a metallic or ceramic substrate, or to produce the disc portion in the form of a monolithic piece of ceramic or composite ceramic, or else to use an antioxidant coating.
  • a ceramic deposit for example zirconia
  • these disc portions can be cooled, for example by circulation of a cooling fluid in channels 11 produced in the disc portions, the cooling thus caused having to be sufficient to maintain the region near the edge at a temperature lower than that where damage could occur, without having a cooling effect on the cast metal.
  • an insulating refractory material 12 in leaktight contact with the frustoconical surfaces 8 of the disc portions 6.
  • This central part made of insulating refractory material is contained towards the rear of the wall 3 by a support plate 13, on which the disk portions 6 are fixed.
  • the frustoconical surface of these is provided with asperities, such as pins 14 which penetrate into said insulating refractory material, or hollows, produced for example by drilling, into which said material penetrates.
  • the central part 12 preferably comprises an overhang 15 relative to the plane of the faces 7 of the disc portions, which is inserted between the cylinders.
  • the insulating refractory material has a thermal conductivity of less than 0.35 W / mK, that is to say that it must be sufficiently insulating to avoid solidification of the metal on contact, and have good dimensional stability during large temperature variations.
  • a fibrous refractory for example composed of alumina fibers impregnated with zirconia gel (for example of the type marketed under the name of Procelit or Procal).
  • FIG. 3a represents, on an enlarged scale, the central zone of the side wall before the start of the casting in a plane situated slightly above the neck between the rolls. We therefore see the wall and the overhang 15 which penetrates slightly between the cylinders.
  • the cast metal 22 has worn off the insulating refractory material by eliminating the overhang 15 and by slightly digging the central part, as shown in FIG. 3b.
  • the metal continues to dig the insulating refractory and creates in it a cavity 16 of rounded section.
  • the solidified skin 17 which then forms in this cavity clings to the insulating refractory material, forming the autocreuset mentioned above.
  • the autocreuset 17 occupies in the insulating refractory material a larger space than that existing, at the same level, between the cylinders. This extra width is authorized by the particular constitution of the side walls according to the invention, and in particular by the fact that the disc portions 6 are frustoconical.
  • this extra width of the autocreuset allows the edges of the cast product to retain a thickness substantially equal to the general thickness of the product. It will indeed be understood that the edges of the final product are obtained from the metal being solidified which moves, simultaneously with the metal passing between the cylinders, in the vertical gutter formed by the autocreuset which is fixed to it relative to the side wall.
  • the autocreuset protects the insulating refractory material from direct contact with the molten metal, preventing the progression of its wear, which makes it possible to ensure the stability of the process for the pursuit of casting.
  • FIGS. 4 and 5 the side wall has been shown in the established casting regime, respectively in plan and in horizontal section at the level of line V V, situated clearly above the neck.
  • V V level of line
  • the depth and width of the wear marks 18 increases downwards, until they meet to form the cavity 16, shown in FIG. 3c, seat of the autocreuset 17.
  • the formation and stability of the autocreuset results from the thermal equilibrium which is established between the cast metal and the various parts of the installation and in particular of the side wall.
  • the insulating refractory material, in contact with which the molten metal is brought to the start of the casting must be very insulating in order to avoid premature solidification of said metal between the edges of the rolls.
  • the autocreuset, once formed be as stable as possible.
  • the central part of the wall can be produced in the form of a composite part shown in FIG.
  • the last layer, or the support plate itself, constitutes a safety plate to avoid any risk of molten metal flow in the event of a breakthrough in the autocreuset.
  • They may for example be made of a hard material which does not deform by expansion, such as silica.
  • the portions of discs comprise in their lower part close to the neck between the cylinders, a clearance 19 consisting in removing, until the bottom of the side wall, the bevelled part of said disc portions , this clearance being filled by a widening 20 corresponding to an insulating refractory material, which is consequently in contact with the front faces of the cylinders over the height of this clearance.
  • the presence of the insulating material, softer than the material constituting the disc portions allows the edges of the product, solidified near the neck, to flourish, outside the grip of the cylinders. The rolling force at the neck and at the edges of the rolls can thus be reduced, which prevents deterioration of said rolls. edges.
  • the height of this clearance, above the neck will preferably be close to a length of arc ⁇ of 2 ° measured at the periphery of the cylinders.
  • the disc portions are released in the same area as above only over part of their thickness, leaving a thinned part 21 of disc in contact with the cylinders, which avoids direct contact of the refractory material with the cyclinders, while largely retaining the possibility of the opening of the edge of the cast product, mentioned above.
  • FIG. 10 there is shown, in section at the neck, an application of the invention in the case of casting between two axially offset cylinders, for example in an installation allowing the casting of products of variable width by relative axial displacement of the cylinders.
  • the side wall is not symmetrical, as in the previous examples, with respect to the median plane P of the installation parallel to the axes of the cylinders.
  • This wall 30 is formed on the side where it is in contact with the front face of the cylinder 1 ′ (lower part of the drawing in FIG. 10), in the same way as in the examples described above, and comprises a portion of frustoconical disc 6 ′ fixed to a support plate 13 ', and a central part 12' made of insulating refractory material.
  • the other side of the wall 30 (upper part of FIG.
  • a tongue 31 placed against the cylindrical surface of the cylinder 2 ', for example of the same material as the disc portion 6', this tongue also being in bevel, shaped to match the curvature of the cylinder 2 ', and also fixed to the support plate 13'.
  • the material insulating refractory 12 ' fills the space between the disc portion 6' and the metal tongue 31.
  • This side wall is in fact equivalent to that of the variant, adapted to axially offset cylinders, of the wall described in the French patent application n ° 89 08086 already cited, to which reference may be made for more details, and to which applied the principle of the wall according to the present invention.
  • FIG. 10 allows the axial displacement of the cylinder 2 'relative to the cylinder 1 ′ and to the wall 30, allowing the width of the cast product to be varied.
  • the invention is not limited to the examples and variants described above, and includes any provisions resulting from the combination of said examples or variants.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Moulding By Coating Moulds (AREA)
  • Body Structure For Vehicles (AREA)
  • Crushing And Grinding (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Handcart (AREA)
  • Vehicle Body Suspensions (AREA)
  • Building Environments (AREA)

Abstract

Apparatus for continuous casting between twin rolls 1, 2 with parallel axes, defining between them and with two fixed lateral walls 3 a casting space for a molten metal, each lateral wall comprising at least one lateral part 6, placed against the plane end front surface of one of the rolls, and consisting of a disc portion with an external diameter equal to that of the said adjacent roll, and a central part 12, opposite the said casting space, made from an insulating refractory material. <??>The said disc portion is produced from a material which has characteristics of thermal conductivity and mechanical strength which are greater than those of the said refractory material and is a frustoconical disc portion whose face with the greatest radius of curvature is located towards the roll, and whose frustoconical surface is in contact with the insulating material of the said central part. <??>The invention applies to the continuous casting of thin metal products, notably from steel. <IMAGE>

Description

La présente invention concerne la coulée continue des métaux, notamment de l'acier, entre deux cylindres d'axes parallèles entraînés en rotation en sens contraire, pour l'obtention de produits minces.The present invention relates to the continuous casting of metals, in particular steel, between two cylinders of parallel axes driven in rotation in opposite directions, to obtain thin products.

On sait que dans ce type de coulée, l'un des problèmes est le confinement, vers les extrémités des cylindres, du métal liquide alimenté dans l'espace de coulée défini entre les cylindres. Une solution à ce problème est d'utiliser des parois latérales fixes maintenues de manière étanche contre les cylindres, et notamment contre les surfaces frontales d'extrémités de ceux-ci. Pour éviter que le métal en fusion se solidifie au contact de ces parois et forme un coin de métal solidifié qui empêcherait la formation correcte des bords du produit coulé, il est déjà connu d'utiliser pour ces parois latérales un matériau suffisamment isolant, qui évite ou au moins limite cette solidification. Un tel matériau réfractaire isolant présente cependant généralement des caractéristiques mécaniques insuffisantes pour être maintenues au contact des cylindres mobiles sans provoquer une usure rapide de ce matériau.It is known that in this type of casting, one of the problems is the confinement, towards the ends of the cylinders, of the molten metal fed into the casting space defined between the cylinders. One solution to this problem is to use fixed side walls held in a sealed manner against the cylinders, and in particular against the end surfaces of the latter. To prevent the molten metal from solidifying on contact with these walls and forming a solidified metal wedge which would prevent the correct formation of the edges of the cast product, it is already known to use for these side walls a sufficiently insulating material, which avoids or at least limits this solidification. Such an insulating refractory material however generally has insufficient mechanical properties to be maintained in contact with the movable cylinders without causing rapid wear of this material.

Pour résoudre ce problème, il a déjà été proposé dans la demande de brevet publiée sous le n° FR 2636259 de réaliser des parois latérales dont seule une zone centrale est formée de matériau isolant. Deux languettes métalliques placées de part et d'autre de ce matériau pénètrent légèrement entre les cylindres en épousant leur courbure. Outre une meilleure résistance mécanique, ces languettes favorisent l'étanchéité entre cylindres et paroi latérales du fait que les peaux de métal solidifiées se prolongent sur ces languettes fixes sur lesquelles les bords des peaux glissent, recouvrant ainsi le joint cylindres-parois latérales.To solve this problem, it has already been proposed in the patent application published under the number FR 2636259 to produce side walls of which only a central zone is formed of insulating material. Two metal tabs placed on either side of this material penetrate slightly between the cylinders by marrying their curvature. In addition to better mechanical strength, these tabs promote sealing between cylinders and side walls because the solidified metal skins extend over these fixed tabs on which the edges of the skins slide, thus covering the cylinder-side wall joint.

Il a aussi été proposé, dans la demande de brevet français n° 89 08086 au nom du présent demandeur, une paroi latérale comportant au moins une partie latérale, par exemple métallique, en regard de la surface frontale plane d'un cylindre, et dont la surface en regard de l'espace de coulée est dans le prolongement de la surface dudit cylindre, et se raccorde à une partie frontale de ladite paroi, en retrait dans celle-ci par rapport à la partie latérale, de manière à former dans la paroi une zone en creux prolongeant latéralement l'espace de coulée.It has also been proposed, in French patent application No. 89 08086 in the name of the present applicant, a side wall comprising at least one lateral part, for example metallic, facing the planar front surface of a cylinder, and of which the surface opposite the casting space is an extension of the surface of said cylinder, and is connects to a front part of said wall, recessed therein with respect to the side part, so as to form in the wall a hollow zone laterally extending the casting space.

La présente invention se propose d'apporter une autre solution au problème évoqué précédemment.The present invention proposes to provide another solution to the problem mentioned above.

Avec cet objectif en vue, l'invention a pour objet une installation de coulée continue entre deux cylindres d'axes parallèles définissant entre eux et avec deux parois latérales fixes un espace de coulée d'un métal en fusion, chaque paroi latérale comportant au moins une partie latérale, placée contre la surface frontale plane d'extrémité d'un des cylindres, et constituée d'une portion de disque de diamètre extérieur égal à celui dudit cylindre adjacent, et une partie centrale, en regard dudit espace de coulée, en matériau réfractaire isolant, cette installation étant, selon l'invention, caractérisée en ce que ladite portion de disque est réalisée en un matériau présentant de bonnes caractéristiques de conductibilité thermique et de résistance mécanique supérieures à celles dudit matériau réfractaire. et est une portion de disque tronconique dont la face ayant le plus grand rayon de courbure est située vers le cylindre, et la surface tronconique est au contact du matériau isolant de ladite partie centrale.With this objective in view, the invention relates to a continuous casting installation between two cylinders with parallel axes defining between them and with two fixed side walls a casting space for a molten metal, each side wall comprising at least a lateral part, placed against the flat front end surface of one of the cylinders, and consisting of a disc portion of outside diameter equal to that of said adjacent cylinder, and a central part, opposite said casting space, in insulating refractory material, this installation being, according to the invention, characterized in that said disc portion is made of a material having good thermal conductivity and mechanical resistance characteristics superior to those of said refractory material. and is a portion of frustoconical disc whose face having the greatest radius of curvature is situated towards the cylinder, and the frustoconical surface is in contact with the insulating material of said central part.

La portion de disque en regard de la surface frontale d'extrémité du cylindre étant résistante au frottement, elle peut être plaquée contre le cylindre avec un effort suffisant pour assurer l'étanchéité, sans risque de détérioration ou d'usure. La partie centrale en matériau isolant évite une solidification trop importante du métal et la formation du coin évoqué au début de ce mémoire. Lors de la coulée, cette partie centrale peut être usée par le métal qui la creuse, mais ce faisant le métal qui pénètre dans le creux ainsi formé se rapproche de la surface tronconique de la portion de disque, maintenue à basse température entre autre du fait de sa conductibilité thermique et de sa proximité par rapport aux surfaces refroidies des cylindres. Il s'ensuit que ce métal se solidifie en surface, la paroi ainsi solidifiée s'accroche dans le matériau réfractaire isolant et forme une sorte de glissière dans laquelle le métal liquide peut s'écouler jusqu'au niveau du col entre les cylindres, où, solidifié, il constitue le bord du produit.Since the disc portion opposite the front end surface of the cylinder is resistant to friction, it can be pressed against the cylinder with sufficient force to ensure sealing, without risk of deterioration or wear. The central part in insulating material avoids an excessive solidification of the metal and the formation of the corner mentioned at the beginning of this thesis. During casting, this central part can be worn by the metal which digs it, but in doing so the metal which penetrates into the hollow thus formed approaches the frustoconical surface of the disc portion, kept at low temperature among other things due to its thermal conductivity and its proximity to the cooled surfaces of the cylinders. It follows that this metal solidifies on the surface, the wall thus solidified hooks into the insulating refractory material and forms a sort of slide in which the liquid metal can flow to the level of the neck between the cylinders, where, solidified, it constitutes the edge of the product.

Comme on le comprendra mieux par la suite, la constitution de la paroi latérale selon l'invention permet, en début de coulée, de former un autocreuset, constitué par la peau de métal solidifié dans le matériau réfractaire isolant, qui se stabilise du fait de la proximité des portions de disques, évite ainsi la progression de l'usure dudit matériau réfractaire, et permet ainsi la poursuite de la coulée. Grâce à la conicité des portions de disques, la section horizontale de cet auto-creuset à proximité du col, prend une forme en C dont l'épaisseur des branches décroit vers leurs extrémités, de, sorte que l'écartement entre ces branches est sensiblement constant, ce qui permet d'obtenir des bords du produit coulé d'épaisseur sensiblement égale à l'épaisseur de la zone centrale de celui-ci.As will be better understood below, the constitution of the side wall according to the invention makes it possible, at the start of casting, to form an autocreuset, constituted by the skin of metal solidified in the insulating refractory material, which stabilizes due to the proximity of the disc portions, thus prevents the progression of wear of said refractory material, and thus allows the continuation of the casting. Thanks to the taper of the portions of discs, the horizontal section of this self-crucible near the neck, takes a C shape whose thickness of the branches decreases towards their ends, so that the spacing between these branches is substantially constant, which makes it possible to obtain the edges of the cast product of thickness substantially equal to the thickness of the central zone thereof.

Selon une disposition particulière, la surface tronconique de la portion de disque peut comporter des aspérités, telles que des picots, qui améliorent l'accrochage du matériau isolant et donc le maintien de l'autocreuset sur ses bords.According to a particular arrangement, the frustoconical surface of the disc portion may include asperities, such as spikes, which improve the attachment of the insulating material and therefore the maintenance of the autocreuset on its edges.

Selon une autre disposition, la partie centrale en matériau réfractaire isolant peut être constituée de plusieurs de ces matériaux disposés en couches successives présentant des caractéristiques de résistance mécanique et/ou d'isolation thermique variant graduellement à partir du matériau situé vers l'espace de coulée, qui possède le coefficient d'isolation le plus élevé.According to another arrangement, the central part of insulating refractory material can be made up of several of these materials arranged in successive layers having characteristics of mechanical resistance and / or thermal insulation varying gradually from the material located towards the casting space. , which has the highest insulation coefficient.

Les portions de disques, ou au moins la zone de plus grand diamètre de ceux-ci, peuvent être revêtus ou constitués par un matériau résistant à la chaleur et présentant notamment une bonne tenue mécanique à haute température, tel que de la zircone, et de plus peuvent être refroidis, par exemple par une circulation interne d'un fluide de refroidissement.The disc portions, or at least the area of larger diameter thereof, may be coated or made of a material resistant to heat and having in particular good mechanical strength at high temperature, such as zirconia, and more can be cooled, by example by an internal circulation of a cooling fluid.

D'autres caractéristiques et avantages ressortiront de la description qui va être faite à titre d'exemple d'une installation de coulée continue de produits minces en acier, conformes à l'invention.Other characteristics and advantages will emerge from the description which will be given by way of example of an installation for the continuous casting of thin steel products, in accordance with the invention.

On se reportera aux dessins annexés dans lesquels :

  • la figure 1 est une représentation partielle d'une installation de coulée continue entre deux cylindres, en vue de dessus et en coupe selon un plan horizontal ;
  • la figure 2 est une vue frontale, à échelle réduite, de la paroi d'obturation selon la flèche F de la figure 1 ;
  • les figures 3a à 3c sont des schémas montrant l'évolution, au début de la coulée, de la partie centrale de la paroi latérale, à proximité du col entre les cylindres ;
  • la figure 4 est une vue schématique frontale de la paroi latérale en régime de coulée établi ;
  • la figure 5 est une vue schématique de la paroi, en régime établi, en coupe selon la ligne V-V de la figure 4 ;
  • la figure 6 est une vue frontale de la paroi latérale selon une première variante ;
  • les figures 7a et 7b sont des vues en coupe de la paroi de la figure 6 aux niveaux repérés respectivement a et b sur cette figure;
  • la figure 8 est une vue frontale de la paroi latérale dans une seconde variante ;
  • les figures 9a et 9b sont des vues en coupe de la paroi de la figure 8, aux niveaux repérés respectivement a et b sur cette figure ;
  • la figure 10 est une vue partielle en coupe d'une autre variante, dans le cas d'une installation de coulée entre cylindres déplaçables axialement l'un par rapport à l'autre ;
  • la figure 11 est une vue de détail, agrandie, de la zone centrale de la paroi dans le cas d'un matériau réfractaire isolant en plusieurs couches.
Reference is made to the appended drawings in which:
  • Figure 1 is a partial representation of a continuous casting installation between two cylinders, in top view and in section along a horizontal plane;
  • Figure 2 is a front view, on a reduced scale, of the closure wall according to arrow F of Figure 1;
  • Figures 3a to 3c are diagrams showing the evolution, at the start of casting, of the central part of the side wall, near the neck between the cylinders;
  • Figure 4 is a schematic front view of the side wall in established casting regime;
  • Figure 5 is a schematic view of the wall, in steady state, in section along the line VV of Figure 4;
  • Figure 6 is a front view of the side wall according to a first variant;
  • Figures 7a and 7b are sectional views of the wall of Figure 6 at the levels marked respectively a and b in this figure;
  • Figure 8 is a front view of the side wall in a second variant;
  • Figures 9a and 9b are sectional views of the wall of Figure 8, at the levels marked respectively a and b in this figure;
  • Figure 10 is a partial sectional view of another variant, in the case of a casting installation between cylinders movable axially relative to each other;
  • FIG. 11 is an enlarged detail view of the central zone of the wall in the case of a material refractory insulating in several layers.

L'installation de coulée continue entre cylindres représentée partiellement à la figure 1, comporte deux cylindres 1 et 2 d'axes parallèles et horizontaux, entraînés en rotation et deux parois latérales d'obturation de l'espace de coulée, telles que la paroi 3, situées vers les extrémités des cylindres et maintenues contre les surfaces frontales 4, 5 d'extrémité des cylindres.The continuous casting installation between cylinders partially shown in FIG. 1, comprises two cylinders 1 and 2 with parallel and horizontal axes, driven in rotation and two lateral walls for closing the casting space, such as wall 3 , located towards the ends of the cylinders and held against the front surfaces 4, 5 of the cylinders.

La paroi latérale 3, représentée à la figure 1 en coupe selon un plan horizontal au niveau des axes des cylindres et en vue frontale à la figure 2, comporte deux parties latérales 6 constituées chacune d'une portion de disque tronconique de plus grand diamètre extérieur égal à celui des cylindres, de manière que la face 7 de ces portions de disques ayant le plus grand rayon de courbure soit située contre la surface frontale 4, 5 du cylindre adjacent, et que l'arête 9 du biseau formé par la surface tronconique 8 et la face 7 de ces portions de disques soit en regard de l'arête formée par le bord de la surface cylindrique 10 du cylindre correspondant.The side wall 3, shown in Figure 1 in section along a horizontal plane at the axes of the cylinders and in front view in Figure 2, has two side parts 6 each consisting of a portion of frustoconical disc of larger outside diameter equal to that of the cylinders, so that the face 7 of these portions of discs having the greatest radius of curvature is situated against the front surface 4, 5 of the adjacent cylinder, and that the edge 9 of the bevel formed by the frustoconical surface 8 and the face 7 of these disc portions is opposite the edge formed by the edge of the cylindrical surface 10 of the corresponding cylinder.

Sur le dessin de la figure 2 on a représenté les cylindres uniquement par la trace 10' de leur surface cylindrique, et on voit que cette trace se confond avec l'arête 9 des portions de disque.In the drawing of FIG. 2, the cylinders are represented only by the trace 10 'of their cylindrical surface, and it can be seen that this trace merges with the edge 9 of the disc portions.

L'angle du biseau, c'est-à-dire l'angle à la base de la portion de disque tronconique est de 5 à 85 degrés, et préférentiel lement d'environ 30°.The angle of the bevel, that is to say the angle at the base of the tapered disc portion is 5 to 85 degrees, and preferably about 30 °.

Les portions de disque constituant les parties latérales 6 de la paroi d'obturation 3 sont réalisées en un matériau ayant de bonnes caractéristiques mécaniques, résistant à l'usure, et ayant préférentiellement un coefficient de frottement faible pour limiter les efforts dus à l'éventuel frottement des cylindres sur ces portions de disques. On pourra par exemple les réaliser en fonte, acier, cuivre, et réduire le frottement par une lubrification.The disc portions constituting the lateral parts 6 of the closure wall 3 are made of a material having good mechanical characteristics, resistant to wear, and preferably having a low coefficient of friction to limit the forces due to the possible friction of the cylinders on these portions of discs. We could for example make them out of cast iron, steel, copper, and reduce friction by lubrication.

On notera aussi que la résistance mécanique du matériau constituant les portions de disque permet de plus d'éviter la détérioration de celles-ci si, suite à l'usure du réfractaire isolant, le métal coulé, en cours de solidification, vient à leur contact. La progression de l'usure est arrêtée ou au moins fortement ralentie, et on évite ainsi des infiltrations de métal entre ces portions de disques et les cylindres.It will also be noted that the mechanical strength of the material constituting the disc portions also makes it possible to avoid the deterioration of these if, following the wear of the insulating refractory, the cast metal, in the course of solidification, comes into contact with them. The progression of wear is stopped or at least greatly slowed down, and metal infiltration between these disc portions and the cylinders is thus avoided.

Les portions de disques 6 pourront aussi au voisinage de l'arête 9 être revêtues ou constituées d'un matériau ayant une résistance mécanique particulièrement élevée à haute température et de préférence peu susceptible d'être mouillé par le métal en fusion coulé, et inerte au contact de l'acier liquide pour éviter la détérioration des arêtes 9 des portions de disques, ou l'accrochage sur celle-ci du métal coulé, au cas où du métal en fusion serait amené, en cours de coulée, au contact desdites arêtes. On pourra par exemple utiliser un dépôt de céramique (par exemple zircone) sur un substrat métallique ou égalememt en céramique, ou réaliser la portion de disque sous forme d'une pièce monolithique en céramique ou céramique composite, ou encore utiliser un revêtement antioxydant.The disc portions 6 may also, in the vicinity of the edge 9, be coated or made of a material having a particularly high mechanical resistance at high temperature and preferably unlikely to be wetted by the molten molten metal, and inert to the contact of the liquid steel to avoid deterioration of the edges 9 of the disc portions, or the attachment of cast metal thereon, in the event that molten metal is brought, during casting, into contact with said edges. It is possible, for example, to use a ceramic deposit (for example zirconia) on a metallic or ceramic substrate, or to produce the disc portion in the form of a monolithic piece of ceramic or composite ceramic, or else to use an antioxidant coating.

De plus ces portions de disques peuvent être refroidies, par exemple par circulation d'un fluide de refroidissement dans des canaux 11 réalisés dans les portions de disques, le refroidissement ainsi provoqué devant être suffisant pour maintenir la zone voisine de l'arête à une température inférieure à celle où des dégradations pourraient subvenir, sans pour autant avoir un effet de refroidissement du métal coulé.In addition, these disc portions can be cooled, for example by circulation of a cooling fluid in channels 11 produced in the disc portions, the cooling thus caused having to be sufficient to maintain the region near the edge at a temperature lower than that where damage could occur, without having a cooling effect on the cast metal.

Entre les deux portions de disque 6, dans la partie centrale de la paroi latérale 3, est placé un matériau réfractaire isolant 12, en contact étanche avec les surfaces tronconiques 8 des portions de disques 6. Cette partie centrale en matériau réfractaire isolant est contenue vers l'arrière de la paroi 3 par une plaque support 13, sur laquelle sont fixées les portions de disques 6.Between the two disc portions 6, in the central part of the side wall 3, is placed an insulating refractory material 12, in leaktight contact with the frustoconical surfaces 8 of the disc portions 6. This central part made of insulating refractory material is contained towards the rear of the wall 3 by a support plate 13, on which the disk portions 6 are fixed.

Pour améliorer l'ancrage du matériau réfractaire isolant sur les portions de disques 6, et notamment à proximité du col entre les cylindres, la surface tronconique de ceux-ci est pourvue d'aspérités, telles que des picots 14 qui pénètrent dans ledit matériau réfractaire isolant, ou des creusements, réalisés par exemple par perçage, dans lesquels pénètre ledit matériau.To improve the anchoring of the refractory insulating material on the disc portions 6, and in particular near the neck between the cylinders, the frustoconical surface of these is provided with asperities, such as pins 14 which penetrate into said insulating refractory material, or hollows, produced for example by drilling, into which said material penetrates.

Par ailleurs, la partie centrale 12 comporte préférentiellement un débord 15 par rapport au plan des faces 7 des portions de disques, qui s'insère entre les cylindres.Furthermore, the central part 12 preferably comprises an overhang 15 relative to the plane of the faces 7 of the disc portions, which is inserted between the cylinders.

Le matériau réfractaire isolant a une conductibilité thermique inférieure à 0,35 W/m.K, c'est-à-dire qu'il doit être suffisamment isolant pour éviter la solidification du métal à son contact, et présenter une bonne stabilité dimensionnelle lors d'importantes variations de température. On pourra par exemple utiliser un réfractaire fibreux, par exemple composé de fibres d'alumine imprégnés de gel de zircone (par exemple du type commercialisé sous le nom de Procélit ou Procal).The insulating refractory material has a thermal conductivity of less than 0.35 W / mK, that is to say that it must be sufficiently insulating to avoid solidification of the metal on contact, and have good dimensional stability during large temperature variations. We can for example use a fibrous refractory, for example composed of alumina fibers impregnated with zirconia gel (for example of the type marketed under the name of Procelit or Procal).

Pour mieux faire comprendre les avantages de la paroi latérale selon l'invention, les schémas de la figure 3 représentent l'évolution de cette paroi au début de la coulée.To better understand the advantages of the side wall according to the invention, the diagrams in Figure 3 represent the evolution of this wall at the start of casting.

La figure 3a représente, à échelle agrandie, la zone centrale de la paroi latérale avant le début de la coulée dans un plan situé légèrement au-dessus du col entre les cylindres. On y voit donc la paroi et le débord 15 qui pénètre légèrement entre les cylindres.FIG. 3a represents, on an enlarged scale, the central zone of the side wall before the start of the casting in a plane situated slightly above the neck between the rolls. We therefore see the wall and the overhang 15 which penetrates slightly between the cylinders.

Après un temps de coulée relativement court, le métal coulé 22 a usé le matériau réfractaire isolant en supprimant le débord 15 et en creusant légèrement la partie centrale, ainsi que représenté à la figure 3b.After a relatively short casting time, the cast metal 22 has worn off the insulating refractory material by eliminating the overhang 15 and by slightly digging the central part, as shown in FIG. 3b.

La coulée se poursuivant, le métal continue à creuser le réfractaire isolant et crée dans celui-ci une cavité 16 de section arrondie. La peau solidifiée 17 qui se forme alors dans cette cavité s'accroche au matériau réfractaire isolant, formant l'autocreuset évoqué précédemment.As the casting continues, the metal continues to dig the insulating refractory and creates in it a cavity 16 of rounded section. The solidified skin 17 which then forms in this cavity clings to the insulating refractory material, forming the autocreuset mentioned above.

On notera que l'autocreuset 17 occupe dans le matériau réfractaire isolant un espace plus large que celui existant, au même niveau, entre les cylindres. Cette surlargeur est autorisée par la constitution particulière des parois latérales conforme à l'invention, et notamment par le fait que les portions de disques 6 sont tronconiques.It will be noted that the autocreuset 17 occupies in the insulating refractory material a larger space than that existing, at the same level, between the cylinders. This extra width is authorized by the particular constitution of the side walls according to the invention, and in particular by the fact that the disc portions 6 are frustoconical.

De plus cette surlargeur de l'autocreuset permet aux bords du produit coulé de conserver une épaisseur sensiblement égale à l'épaisseur générale du produit. On comprendra en effet que les bords du produit final sont obtenus à partir du métal en cours de solidification qui se déplace, simultanément au métal'passant entre les cylindres, dans la gouttière verticale formée par l'autocreuset qui lui est fixe par rapport à la paroi latérale.In addition this extra width of the autocreuset allows the edges of the cast product to retain a thickness substantially equal to the general thickness of the product. It will indeed be understood that the edges of the final product are obtained from the metal being solidified which moves, simultaneously with the metal passing between the cylinders, in the vertical gutter formed by the autocreuset which is fixed to it relative to the side wall.

On comprendra aussi, qu'une fois l'autocreuset formé, celui-ci protège le matériau réfractaire isolant du contact direct du métal en fusion, empêchant la progression de son usure, ce qui permet d'assurer la stabilité du processus pour la poursuite de la coulée.It will also be understood that once the autocreuset is formed, it protects the insulating refractory material from direct contact with the molten metal, preventing the progression of its wear, which makes it possible to ensure the stability of the process for the pursuit of casting.

On notera aussi que les peaux 23 de métal, solidifiées au contact des cylindres et se déplaçant avec ceux-ci, ne sont pas liées à la peau 16 formant autocreuset.It will also be noted that the skins 23 of metal, solidified in contact with the cylinders and moving with them, are not linked to the skin 16 forming an autocreuset.

Sur les dessins des figures 4 et 5, on a représenté la paroi latérale en régime de coulée établi, respectivement en plan et en coupe horizontale au niveau de la ligne V V, située nettement au-dessus du col. On y voit le creusement en forme de V résultant de l'usure du matériau réfractaire isolant par les bords des peaux de métal 23 solidifiées sur les cylindres. La profondeur et la largeur des marques d'usure 18 augmente vers le bas, jusqu'à ce qu'elles se rejoignent pour former la cavité 16, représentée à la figure 3c, siège de l'autocreuset 17.In the drawings of FIGS. 4 and 5, the side wall has been shown in the established casting regime, respectively in plan and in horizontal section at the level of line V V, situated clearly above the neck. We see the V-shaped digging resulting from the wear of the refractory insulating material by the edges of the metal skins 23 solidified on the cylinders. The depth and width of the wear marks 18 increases downwards, until they meet to form the cavity 16, shown in FIG. 3c, seat of the autocreuset 17.

On notera encore que la formation et la stabilité de l'autocreuset résulte de l'équilibre thermique qui s'établit entre le métal coulé et les différentes parties de l'installation et notamment de la paroi latérale. C'est pourquoi le matériau réfractaire isolant, au contact duquel le métal en fusion est amené au début de la coulée, doit être très isolant pour éviter une solidification prématurée dudit métal entre les bords des cylindres. Par ailleurs, il est souhaitable que l'autocreuset, une fois formé soit le plus stable possible. A cette fin on peut réaliser la partie centrale de la paroi sous forme d'une pièce composite représentée à la figure 11 formée de plusieurs couches 12a, 12b, 12c de différents matériaux réfractaires disposées verticalement, dont les caractéristiques de résistance mécanique croissent et celles d'isolation thermique décroissent corrélativement à partir du plan des faces 7 des portions de disques vers la plaque support 13. Ainsi au tout début de la coulée, c'est l'aspect isolation thermique qui est prépondérant, lors du premier contact du métal en fusion avec le matériau réfractaire isolant, alors que lors de la formation de l'autocreuset, le creusement de la partie centrale conduit l'auotcreuset à atteindre des couches mécaniquement plus résistantes qui limitent sa progression et, une fois arrivé en régime établi assurent une meilleure assise pour celui-ci.It will also be noted that the formation and stability of the autocreuset results from the thermal equilibrium which is established between the cast metal and the various parts of the installation and in particular of the side wall. This is why the insulating refractory material, in contact with which the molten metal is brought to the start of the casting, must be very insulating in order to avoid premature solidification of said metal between the edges of the rolls. Furthermore, it is desirable that the autocreuset, once formed, be as stable as possible. To this end, the central part of the wall can be produced in the form of a composite part shown in FIG. 11 formed of several layers 12a, 12b, 12c of different refractory materials arranged vertically, whose mechanical resistance characteristics increase and those of thermal insulation correlatively decrease from the plane of the faces 7 of the disc portions towards the support plate 13. Thus at the very beginning of the casting, it is the thermal insulation aspect which is predominant, during the first contact of the molten metal with the insulating refractory material, while during the formation of the autocreuset, the digging of the central part leads the auotcreuset to reach mechanically more resistant layers which limit its progression and, once arrived in steady state ensure a better seat for this one.

La dernière couche, ou la plaque support elle-même, constituent une plaque de sécurité pour éviter tout risque d'écoulement de métal en fusion en cas de percée de l'autocreuset. Ellles pourront par exemple être réalisées en un matériau dur ne se déformant pas par dilatation, tel que de la silice.The last layer, or the support plate itself, constitutes a safety plate to avoid any risk of molten metal flow in the event of a breakthrough in the autocreuset. They may for example be made of a hard material which does not deform by expansion, such as silica.

Selon une variante, représentée aux figures 6 et 7, les portions de disques comportent dans leur partie inférieure voisine du col entre les cylindres, un dégagement 19 consistant à supprimer jusqu'en bas de la paroi latérale, la partie en biseau desdites portions de disque, ce dégagement étant comblé par un élargissement 20 correspondant un matériau réfractaire isolant, qui se trouve en conséquence au contact des faces frontales des cylindres sur la hauteur de ce dégagement. La présence du matériau isolant, plus tendre que le matériau constitutif des portions de disques, autorise un épanouissement, hors de l'emprise des cylindres, des bords du produit, solidifiés à proximité du col. L'effort de laminage au niveau du col, et aux bords des cylindres peut ainsi être réduit, ce qui évite la détérioration desdits bords.According to a variant, represented in FIGS. 6 and 7, the portions of discs comprise in their lower part close to the neck between the cylinders, a clearance 19 consisting in removing, until the bottom of the side wall, the bevelled part of said disc portions , this clearance being filled by a widening 20 corresponding to an insulating refractory material, which is consequently in contact with the front faces of the cylinders over the height of this clearance. The presence of the insulating material, softer than the material constituting the disc portions, allows the edges of the product, solidified near the neck, to flourish, outside the grip of the cylinders. The rolling force at the neck and at the edges of the rolls can thus be reduced, which prevents deterioration of said rolls. edges.

La hauteur de ce dégagement, au-dessus du col sera préférentiellement voisine d'une longueur d'arc β de 2° mesurée à la périphérie des cylindres.The height of this clearance, above the neck will preferably be close to a length of arc β of 2 ° measured at the periphery of the cylinders.

Selon une autre variante représentée aux figures 8 et 9, les portions de disque ne sont dégagées dans la même zone que ci-dessus que sur une partie de leur épaisseur, laissant subsister une partie amincie 21 de disque au contact des cylindres, ce qui évite le contact direct du matériau réfractaire avec les cyclindres, tout en conservant en grande partie la possiblité de l'épanouissement du bord du produit coulé, mentionné ci-dessus.According to another variant shown in Figures 8 and 9, the disc portions are released in the same area as above only over part of their thickness, leaving a thinned part 21 of disc in contact with the cylinders, which avoids direct contact of the refractory material with the cyclinders, while largely retaining the possibility of the opening of the edge of the cast product, mentioned above.

Ces dégagements autorisent par ailleurs le passage dans le matériau réfractaire d'une éventuelle surépaisseur du bord du produit qui pourrait résulter d'un élargisssement momentané trop important de l'autocreuset.These clearances also allow the passage through the refractory material of a possible excess thickness of the edge of the product which could result from a too large momentary widening of the autocreuset.

Sur le dessin de la figure 10, on a représenté, en section au niveau du col, une application de l'invention au cas de la coulée entre deux cylindres axialement décalés, par exemple dans une installation permettant la coulée de produits de largeur variable par déplacement axial relatif des cylindres.In the drawing of FIG. 10, there is shown, in section at the neck, an application of the invention in the case of casting between two axially offset cylinders, for example in an installation allowing the casting of products of variable width by relative axial displacement of the cylinders.

Dans ce cas la paroi latérale n'est pas symétrique, comme dans les exemples précédents, par rapport au plan P médian de l'installation parallèle aux axes des cylindres. Cette paroi 30 est constituée du côté où elle est en contact avec la face frontale du cylindre 1′ (partie inférieure du dessin de la figure 10), de même manière que dans les exemple décrits ci-dessus, et comporte une portion de disque tronconique 6′ fixée sur une plaque support 13', et une partie centrale 12' en matériau réfractaire isolant. L'autre côté de la paroi 30 (partie supérieure de la figure 10) est constituée par une languette 31 placée contre la surface cylindrique du cylindre 2', par exemple de même matériau que la portion de disque 6', cette languette étant également en biseau, conformée pour épouser la courbure du cylindre 2', et également fixée sur la plaque support 13'. Le matériau réfractaire isolant 12' remplit l'espace entre la portion de disque 6' et la languette métallique 31.In this case the side wall is not symmetrical, as in the previous examples, with respect to the median plane P of the installation parallel to the axes of the cylinders. This wall 30 is formed on the side where it is in contact with the front face of the cylinder 1 ′ (lower part of the drawing in FIG. 10), in the same way as in the examples described above, and comprises a portion of frustoconical disc 6 ′ fixed to a support plate 13 ', and a central part 12' made of insulating refractory material. The other side of the wall 30 (upper part of FIG. 10) is constituted by a tongue 31 placed against the cylindrical surface of the cylinder 2 ', for example of the same material as the disc portion 6', this tongue also being in bevel, shaped to match the curvature of the cylinder 2 ', and also fixed to the support plate 13'. The material insulating refractory 12 'fills the space between the disc portion 6' and the metal tongue 31.

Cette paroi latérale est en fait équivalente à celle de la variante, adaptée aux cylindres axialement décalés, de la paroi décrite dans la demande de brevet français n° 89 08086 déjà citée, auquel on pourra se reporter pour plus de détails, et à laquelle on a appliqué le principe de la paroi selon la présente invention.This side wall is in fact equivalent to that of the variant, adapted to axially offset cylinders, of the wall described in the French patent application n ° 89 08086 already cited, to which reference may be made for more details, and to which applied the principle of the wall according to the present invention.

On comprendra aisément que la disposition particulière de la figure 10 permet le déplacement axial du cylindre 2' par rapport au cylindre 1′ et à la paroi 30, permettant la variation de largeur du produit coulé.It will easily be understood that the particular arrangement in FIG. 10 allows the axial displacement of the cylinder 2 'relative to the cylinder 1 ′ and to the wall 30, allowing the width of the cast product to be varied.

On comprendra aussi que dans le cas de cette variante l'autocreuset, qui se forme de manière similaire à ce qui a été expliqué précédemment, n'est pas symétrique par rapport au plan P, mais décalé vers le côté de la portion de disque 6', ce qui provoque la formation d'une rive du produit légèrement coudée par rapport au plan général du produit mince obtenu. Ce défaut apparent n'est toutefois pas préjudiciable lorsque les rives du produit sont ultérieurement chutées, après la coulée, par exemple par cisaillage. Au contraire, dans ce cas le chutage des rives peut être facilité.It will also be understood that in the case of this variant the autocreuset, which forms in a similar manner to what has been explained previously, is not symmetrical with respect to the plane P, but offset towards the side of the disc portion 6 ', which causes the formation of a bank of the product slightly bent with respect to the general plane of the thin product obtained. This apparent defect is not however detrimental when the edges of the product are subsequently dropped, after casting, for example by shearing. On the contrary, in this case the falling of the banks can be facilitated.

L'invention n'est pas limitée aux exemples et variantes précédemment décrits, et inclut toutes dispositions résultant de la combinaison desdits exemples ou variantes.The invention is not limited to the examples and variants described above, and includes any provisions resulting from the combination of said examples or variants.

Claims (13)

1) Installation de coulée continue entre deux cylindres (1,2) d'axes parallèles définissant entre eux et avec deux parois latérales fixes un espace de coulée d'un métal en fusion, chaque paroi latérale (3) comportant au moins une partie latérale (6), placée contre la surface frontale (4,5) plane d'extrémité d'un des cylindres, et constituée d'une portion de disque de diamètre extérieur égal à celui dudit cylindre adjacent, et une partie centrale (12), en regard dudit espace de coulée, en matériau réfractaire isolant, caractérisée en ce que ladite portion de disque est réalisée en un matériau présentant des caractéristiques de conductibilité thermique et de résistance mécanique supérieures à celles dudit matériau réfractaire, et est une portion de disque tronconique dont la face ayant le plus grand rayon de courbure est située vers le cylindre, et la surface tronconique (8) est au contact du matériau isolant de ladite partie centrale. 1) Installation for continuous casting between two cylinders (1,2) with parallel axes defining between them and with two fixed side walls a casting space for a molten metal, each side wall (3) comprising at least one lateral part (6), placed against the flat end surface (4,5) of one end of one of the cylinders, and consisting of a portion of disc of outside diameter equal to that of said adjacent cylinder, and a central part (12), facing said casting space, made of insulating refractory material, characterized in that said disc portion is made of a material having thermal conductivity and mechanical resistance characteristics greater than those of said refractory material, and is a frustoconical disc portion of which the face having the greatest radius of curvature is located towards the cylinder, and the frustoconical surface (8) is in contact with the insulating material of said central part. 2) Installation selon la revendication 1, caractérisée en ce que l'angle à la base de la portion de disque tronconique (6) est compris entre 5 et 85°. 2) Installation according to claim 1, characterized in that the angle at the base of the frustoconical disc portion (6) is between 5 and 85 °. 3) Installation selon la revendication 1, caractérisée en ce que le matériau réfractaire isolant est un fibreux d'alumine. 3) Installation according to claim 1, characterized in that the insulating refractory material is an alumina fiber. 4) Installation selon la revendication 1, caractérisée en ce que la partie centrale est constituée de plusieurs couches (12a, 12b, 12c) de matériaux présentant des caractéristiques de résistance mécanique croissante à partir de la couche (12a) située vers l'espace de coulée 4) Installation according to claim 1, characterized in that the central part consists of several layers (12a, 12b, 12c) of materials having characteristics of increasing mechanical resistance from the layer (12a) located towards the space of casting 5) Installation selon la revendication 1, caractérisée en ce que les portions de disques sont en fonte, acier, cuivre, molybdène ou un de leurs alliages. 5) Installation according to claim 1, characterized in that the disc portions are made of cast iron, steel, copper, molybdenum or one of their alloys. 6) Installation selon la revendication 1, caractérisée en ce que la surface tronconique des portions de disques comporte des aspérités (14). 6) Installation according to claim 1, characterized in that the frustoconical surface of the disc portions has asperities (14). 7) Installation selon la revendication 1, caractérisée en ce que les portions de disques sont revêtues ou constituées, dans leur zone de plus grand diamètre, par un matériau présentant une bonne tenue mécanique à haute température. 7) Installation according to claim 1, characterized in that the disc portions are coated or formed, in their area of larger diameter, by a material having good mechanical strength at high temperature. 8) Installation selon la revendication 7, caractérisée en ce que ledit matériau est de la zircone. 8) Installation according to claim 7, characterized in that said material is zirconia. 9) Installation selon la revendication 1, caractérisée en ce que les portions de disque sont refroidies. 9) Installation according to claim 1, characterized in that the disc portions are cooled. 10) Installation selon la revendication 1, caractérisée en ce les portions de disques présentent, dans la zone voisine du col entre les cylindres, un dégagement (19), ce dégagement étant comblé par un matériau réfractaire isolant (20). 10) Installation according to claim 1, characterized in that the disc portions have, in the area near the neck between the cylinders, a clearance (19), this clearance being filled with an insulating refractory material (20). 11) Installation selon la revendication 10, caractérisé en ce que ledit dégagement est réalisé sur toute l'épaisseur de la portion de disque. 11) Installation according to claim 10, characterized in that said clearance is achieved over the entire thickness of the disc portion. 12) Installation selon la revendication 10, caractérisée en ce que ledit dégagement est réalisé sur une partie de l'épaisseur de la portion de disque laissant subsister une partie amincie (21) de cette portion de disque au contact du cylindre. 12) Installation according to claim 10, characterized in that said clearance is produced over a part of the thickness of the disc portion leaving a thinned portion (21) of this disc portion in contact with the cylinder. 13) Installation selon la revendication 1, caractérisée en ce que la partie centrale (12) comporte un débord (15) pénétrant entre les cylindres. 13) Installation according to claim 1, characterized in that the central part (12) has an overhang (15) penetrating between the cylinders.
EP91402212A 1990-09-03 1991-08-08 Apparatus for twin-roll continuous casting Expired - Lifetime EP0477045B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9011000A FR2666256B1 (en) 1990-09-03 1990-09-03 CONTINUOUS CASTING INSTALLATION BETWEEN CYLINDERS.
FR9011000 1990-09-03

Publications (2)

Publication Number Publication Date
EP0477045A1 true EP0477045A1 (en) 1992-03-25
EP0477045B1 EP0477045B1 (en) 1995-03-29

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Family Applications (1)

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EP91402212A Expired - Lifetime EP0477045B1 (en) 1990-09-03 1991-08-08 Apparatus for twin-roll continuous casting

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US (1) US5172750A (en)
EP (1) EP0477045B1 (en)
JP (1) JP2949122B2 (en)
AT (1) ATE120392T1 (en)
AU (1) AU647169B2 (en)
CA (1) CA2050112C (en)
DE (1) DE69108496T2 (en)
DK (1) DK0477045T3 (en)
ES (1) ES2074241T3 (en)
FI (1) FI94103C (en)
FR (1) FR2666256B1 (en)
IE (1) IE913086A1 (en)
NO (1) NO178820C (en)
PT (1) PT98844A (en)
TW (1) TW222599B (en)
ZA (1) ZA916945B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552125A1 (en) * 1992-01-17 1993-07-21 USINOR SACILOR Société Anonyme Twin roll type continuous casting machine with lateral refractory walls
FR2699436A1 (en) * 1992-12-17 1994-06-24 Usinor Sacilor Device for the continuous casting of metal between rolls
FR2765504A1 (en) * 1997-07-04 1999-01-08 Usinor SIDE SIDE FOR SEALING THE CASTING SPACE OF A CONTINUOUS CASTING INSTALLATION BETWEEN METAL THIN STRIP CYLINDERS

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2688721B1 (en) * 1992-03-18 1994-06-17 Usinor Sacilor DEVICE FOR CONTINUOUSLY CASTING A METAL PRODUCT BETWEEN CYLINDERS.
FR2842130B1 (en) * 2002-07-12 2004-10-15 Usinor SIDE SIDE FOR INSTALLATION OF CONTINUOUS CASTING OF METAL STRIPS BETWEEN TWO CYLINDERS
CH696138A5 (en) * 2002-10-04 2007-01-15 Main Man Inspiration Ag Sealing plate to the side sealing of a casting gap formed between two casting rolls of a strip-casting machine.
CH697156A5 (en) * 2004-09-17 2008-05-30 Main Man Inspiration Ag Side sealing a casting gap formed between two casting rolls of a strip-casting machine.
US8191610B2 (en) * 2008-11-24 2012-06-05 Nucor Corporation Strip casting apparatus with improved side dam
US10046384B2 (en) 2015-09-30 2018-08-14 Nucor Corporation Side dam with pocket

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348227A1 (en) * 1988-06-24 1989-12-27 Kawasaki Steel Corporation Side wall construction for continuous belt caster
EP0360635A1 (en) * 1988-09-14 1990-03-28 Usinor Sacilor Side wall for a continuous casting plant between movable walls, installations with walls, method suitable for contiuous casting thin metallic products

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6326244A (en) * 1986-07-16 1988-02-03 Kawasaki Steel Corp Stationary short side for continuous casting of thin ingot
JPH01162545A (en) * 1987-12-21 1989-06-27 Kawasaki Steel Corp Short side plate for strip continuous casting machine
FR2652021A1 (en) * 1989-06-15 1991-03-22 Siderurgie Fse Inst Rech LATERAL SHUTTER WALL FOR CONTINUOUS CASTING INSTALLATION BETWEEN MOBILE WALLS.
FR2655577B1 (en) * 1989-12-07 1992-01-24 Siderurgie Fse Inst Rech CONTINUOUS CASTING INSTALLATION OF THIN METAL PRODUCTS BETWEEN TWO CYLINDERS.

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0348227A1 (en) * 1988-06-24 1989-12-27 Kawasaki Steel Corporation Side wall construction for continuous belt caster
EP0360635A1 (en) * 1988-09-14 1990-03-28 Usinor Sacilor Side wall for a continuous casting plant between movable walls, installations with walls, method suitable for contiuous casting thin metallic products

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 12, no. 229 (M-714)(3076) 29 Juin 1988 & JP-A-63 026 244 ( KAWASAKI STEEL CORP ) 3 Février 1988 *
PATENT ABSTRACTS OF JAPAN vol. 13, no. 425 (M-873)(3773) 21 Septembre 1989 & JP-A-1 162 545 ( KAWASAKI STEEL CORP. ) 27 Juin 1989 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0552125A1 (en) * 1992-01-17 1993-07-21 USINOR SACILOR Société Anonyme Twin roll type continuous casting machine with lateral refractory walls
FR2699436A1 (en) * 1992-12-17 1994-06-24 Usinor Sacilor Device for the continuous casting of metal between rolls
FR2765504A1 (en) * 1997-07-04 1999-01-08 Usinor SIDE SIDE FOR SEALING THE CASTING SPACE OF A CONTINUOUS CASTING INSTALLATION BETWEEN METAL THIN STRIP CYLINDERS
EP0894556A1 (en) * 1997-07-04 1999-02-03 Usinor Side wall for a twin roll continuous casting machine for casting thin metal strip
US6082437A (en) * 1997-07-04 2000-07-04 Usinor Side wall for closing off the casting space of a plant for the twin-roll continuous casting of thin metal strip

Also Published As

Publication number Publication date
PT98844A (en) 1993-11-30
AU8276891A (en) 1992-03-05
FI914111A0 (en) 1991-09-02
ATE120392T1 (en) 1995-04-15
NO178820C (en) 1996-06-12
FI94103B (en) 1995-04-13
EP0477045B1 (en) 1995-03-29
IE913086A1 (en) 1992-03-11
US5172750A (en) 1992-12-22
FI914111A (en) 1992-03-04
NO178820B (en) 1996-03-04
ZA916945B (en) 1993-04-28
CA2050112C (en) 1999-02-23
DK0477045T3 (en) 1995-08-21
CA2050112A1 (en) 1992-03-04
JP2949122B2 (en) 1999-09-13
NO913375L (en) 1992-03-04
ES2074241T3 (en) 1995-09-01
FR2666256A1 (en) 1992-03-06
DE69108496T2 (en) 1995-08-03
FI94103C (en) 1995-07-25
TW222599B (en) 1994-04-21
JPH05123832A (en) 1993-05-21
AU647169B2 (en) 1994-03-17
NO913375D0 (en) 1991-08-28
DE69108496D1 (en) 1995-05-04
FR2666256B1 (en) 1992-10-16

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