EP0451129A2 - A method and device for supporting a continuously cast metal product - Google Patents

A method and device for supporting a continuously cast metal product Download PDF

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Publication number
EP0451129A2
EP0451129A2 EP19910870054 EP91870054A EP0451129A2 EP 0451129 A2 EP0451129 A2 EP 0451129A2 EP 19910870054 EP19910870054 EP 19910870054 EP 91870054 A EP91870054 A EP 91870054A EP 0451129 A2 EP0451129 A2 EP 0451129A2
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EP
European Patent Office
Prior art keywords
metal product
support roller
product
annular volume
support
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19910870054
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German (de)
French (fr)
Inventor
Stéphan Wilmotte
Marios Economopoulos
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Centre de Recherches Metallurgiques CRM ASBL
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Centre de Recherches Metallurgiques CRM ASBL
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Application filed by Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0451129A2 publication Critical patent/EP0451129A2/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/128—Accessories for subsequent treating or working cast stock in situ for removing

Definitions

  • the present invention relates to a method and a device for supporting a continuously cast metal product.
  • the invention relates more particularly to a wide product, such as a slab, and more specifically still a steel slab, without however being limited to this single application.
  • the slab is usually supported by rollers of relatively small diameter, which are themselves supported at their ends, that is to say on either side of the width of the slab.
  • rollers of relatively small diameter, which are themselves supported at their ends, that is to say on either side of the width of the slab.
  • these rollers deform under the effect of the load applied by the slab, and that they then take an undesirable curvature.
  • the object of the present invention is to provide a method and a device for supporting a continuously cast metal product, whatever the width of this product, using simple means which prevent any deformation of the support rollers.
  • the method and the device of the invention are applicable both in conventional continuous casting as in continuous casting of thin products, with or without rolling.
  • a method for supporting a continuously cast metal product in which said metal product is supported by means of a plurality of support rollers extending along the width of said metal product and succeeding each other along the trajectory followed by this product, is characterized in that individually formed on the surface of at least one of said support rollers a layer of coolant under pressure extending in longitudinal direction substantially over the entire length of said support roll and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said layer of pressurized coolant being substantially diametrically opposite at the region of contact of said support roller with the metallic product, and in that it ensures the flow of at least part of said coolant under pressure on the lateral surface of said support roller, beyond said layer.
  • this method ensures the flow of at least a portion of said pressurized coolant over the surface of said metal product.
  • the pressure prevailing in the coolant layer can be different with each support roll.
  • the present invention also relates to a device for supporting a continuously cast metal product, in application of the method which has just been described.
  • a device for supporting a continuously cast metal product which comprises a plurality of support rollers extending along the width of said metal product and succeeding each other along the path followed by this product, is characterized in that 'It comprises at least one wall respectively adjacent to one of said support rollers, in that said wall remotely follows the shape of said support roller so as to define therewith a portion of annular volume, in that said portion of annular volume extends in longitudinal direction substantially over the entire length of said support roller and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said portion of annular volume being substantially diametrically opposite to the contact region of said support roller with the metallic product, and in that said annular volume portion is provided with hub ns inlet and outlet for a coolant.
  • said wall constitutes the concave face of the cavity of a hydraulic bearing, which is coaxial with said support roller.
  • throttling means preferably adjustable, to vary the outlet section of said portion of annular volume. along said longitudinal edges.
  • guide means extending said wall in the circumferential direction beyond said throttling means, said guide means also conforming to the shape of said support roller and extending to a small distance from the continuously cast metal product.
  • the aforementioned guide means are provided, at their end close to the metal product, fins substantially parallel to said metal product and oriented outwards relative to the support roller to which said means are associated.
  • This figure is only a schematic representation, without particular scale, comprising only the elements necessary for understanding the invention. Furthermore, it shows only one support roll, but it goes without saying that any number of support rolls of a continuous casting installation can be supported in accordance with the teachings of the present invention.
  • This figure shows a section through a device according to the invention, section which is made along a plane perpendicular to the longitudinal axis of said support roll.
  • a bearing 4 is arranged which bears on a fixed seat, for example on the frame of the casting machine. It should be emphasized that the position of this bearing 4 is in principle fixed during a continuous casting operation; this position can however be modified for different casting operations, in particular as a function of the thickness of the slab or the reduction rate of this thickness. It will also be indicated that the bearing 4 extends over the entire length of the support roller 3, that is to say at least over the width of the slab 1. With such a bearing, it is obviously unnecessary to provide rollers for supporting the support roller 3.
  • the bearing 4 has a semi-cylindrical cavity 5, facing the slab 1, in which is housed the support roller 3.
  • the cavity 5 is preferably coaxial with the support roller 3, and the latter is arranged so as to define with the cavity 5 a portion of annular volume 6 whose radial height is preferably constant.
  • the annular volume portion 6 communicates through a plurality of passages 7 with a source of pressurized coolant, not shown.
  • These passages 7 can be arranged in any suitable manner; they are preferably distributed uniformly along the length of the bearing 4.
  • heels 8 are mounted, which can be fixed at different distances from the support roller 3.
  • the double arrows express the possibilities of displacement of the heels 8.
  • These heels 8 constitute organs constrictions which make it possible to vary, together or separately, the longitudinal end sections of the annular volume portion 6.
  • the heels 8 can be provided with cheeks 9 which follow the shape of the support roller 3 from a distance and which define therewith extensions 10 of the annular volume portion 6.
  • the cheeks 9 may have fins 11 arranged parallel to the surface of the slab 1. These fins 11 define with the slab 1 channel sections 12, 13, of width respectively. e1 and e2, which extend transversely over the entire width of the slab 1, below and above the area of contact of the slab 1 with the support roller 3.
  • this device operates in the following manner.
  • a slab 1 leaving a continuous casting mold, not shown, has a solidified skin of small thickness, indicated by a dotted area, which surrounds a still liquid core, corresponding to the hatched part.
  • This slab descends vertically, in the direction of arrow 2, and it enters the secondary cooling zone symbolized by the support roller assembly illustrated in the figure.
  • the slab 1 comes into contact with a pair of support rollers 3, only one of which is shown, which support it and, optionally, reduce its thickness, depending on the force they exert on the slab.
  • This effort is itself the result of a pressure applied to the support roller 3 by a pressurized coolant, introduced into the annular volume portion 6 through the passages 7.
  • This pressurized coolant is supplied by a pump or by any other suitable device, not shown.
  • the heels 8 are adjusted in a position where they provide the desired value of the outlet section of the annular volume portion 6. As is easily understood, a reduction in this outlet section results in an increase in the pressure drop due to the heels 8 and consequently causes an increase in the pressure applied by the coolant to the support roller 3. This obviously results in an increase in the force exerted by the support roller 3 on the slab.
  • the adjustment of the position of the heels 8 therefore makes it possible to modify the tightening of the support rollers 3 on the slab 1.
  • the device of the invention makes it possible either to simply support the slab, or to carry out a rolling of this slab by a modification of the force exerted by the support rollers 3.
  • the figure illustrates the case of a rolling which operates a thickness reduction equal to 2 x (e1 - e2), e1 and e2 being the distances between the surface of the slab and the plane of the fins 11, respectively after and before the support roller 3.
  • the pressurized coolant generally water
  • the bearing 4 is therefore no longer exposed to overheating and it is no longer subject to seizure.
  • the support roller 3 is uniformly supported over its entire length and it does not deform, even under the high forces required for rolling the slab.
  • the slab itself retains the desired section since its large faces are properly supported.
  • the flow rate of the pressurized coolant can be modified, depending on the application, by changing the feed rate and / or the position of the heels 8.

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

Abstract

The metal product is supported by means of a plurality of back-up rolls extending over the width of the metal product and following each other along the path followed by this product. A layer of a pressurized cooling liquid is formed individually at the surface of at least one back-up roll (3), extending in a longitudinal direction substantially over the entire length of the back-up roll (3) and in a circumferential direction over an arc corresponding to an angle at the centre of at least 90 DEG . The layer of pressurized cooling liquid is substantially diametrically opposite the region of contact of the back-up roll (3) with the metal product (1). At least a portion of the pressurized cooling liquid is caused to flow over the lateral surface of the back-up roll (3) and, preferably, also over the lateral surface of the metal product (1). The device comprises a hydrostatic journal bearing (4) extending over the entire length of the back-up roll (3), as well as means (5; 8; 9; 11) for guiding the cooling liquid over the back-up roll (3) and over the metal product (1). <IMAGE>

Description

La présente invention concerne un procédé et un dispositif pour supporter un produit métallique coulé en continu. L'invention vise plus particulièrement un produit large, tel qu'une brame, et plus spécifiquement encore une brame d'acier, sans être cependant limitée à cette seule application.The present invention relates to a method and a device for supporting a continuously cast metal product. The invention relates more particularly to a wide product, such as a slab, and more specifically still a steel slab, without however being limited to this single application.

La description qui va suivre, consacrée à une brame d'acier, n'est donnée qu'à titre de simple illustration, avec le seul souci de bien faire comprendre l'objet de la présente invention.The description which follows, devoted to a steel slab, is given only by way of simple illustration, with the sole aim of making the object of the present invention clearly understood.

On sait que, dans une machine de coulée continue d'une brame d'acier, la brame quittant la lingotière est supportée et guidée par un train de rouleaux de support pendant et après la traversée de la zone de refroidissement secondaire. Ce refroidissement secondaire est généralement réalisé par projection d'eau; il vise essentiellement à accélérer la solidification de l'acier, et à consolider la peau solidifiée, et aussi à refroidir la machine de coulée.It is known that, in a continuous casting machine for a steel slab, the slab leaving the ingot mold is supported and guided by a train of support rollers during and after crossing the secondary cooling zone. This secondary cooling is generally carried out by spraying water; it essentially aims to accelerate the solidification of the steel, and to consolidate the solidified skin, and also to cool the casting machine.

Dans une machine de coulée classique, la brame est habituellement supportée par des rouleaux de diamètre relativement petit, qui sont eux-mêmes appuyés à leurs extrémités, c'est-à-dire de part et d'autre de la largeur de la brame. On constate cependant que ces rouleaux se déforment sous l'effet de la charge appliquée par la brame, et qu'ils prennent alors une courbure indésirable.In a conventional casting machine, the slab is usually supported by rollers of relatively small diameter, which are themselves supported at their ends, that is to say on either side of the width of the slab. However, it is noted that these rollers deform under the effect of the load applied by the slab, and that they then take an undesirable curvature.

L'installation de paliers d'appui intermédiaires supplémentaires ne constitue pas une solution efficace; en effet, si de tels paliers peuvent empêcher ou limiter la déformation des rouleaux, ils sont eux-mêmes soumis aux hautes températures régnant à proximité immédiate de la brame et ils périssent très rapidement par grippage dû à une surchauffe excessive.Installing additional intermediate support bearings is not an effective solution; indeed, if such bearings can prevent or limit the deformation of the rollers, they are themselves subjected to the high temperatures prevailing in the immediate vicinity of the slab and they perish very quickly by seizing up due to excessive overheating.

Par ailleurs, il se développe actuellement des procédés de coulée continue de brames minces, comprenant fréquemment un certain laminage des brames. Ici encore, la charge appliquée aux rouleaux provoque une déformation qui peut être prohibitive à l'égard des dimensions de la brame. En outre, la faible vitesse de laminage accroît la sollicitation thermique des rouleaux et favorise dès lors leur déformation.Furthermore, processes for the continuous casting of thin slabs are being developed, frequently including a certain rolling of the slabs. Here again, the load applied to the rollers causes a deformation which can be prohibitive with regard to the dimensions of the slab. In addition, the low rolling speed increases the thermal stress on the rollers and therefore promotes their deformation.

L'installation de gicleurs pour le refroidissement des rouleaux par projection d'eau conduit à augmenter la complexité et l'encombrement du dispositif de refroidissement. Par ailleurs, l'utilisation de rouleaux creux à refroidissement interne accroît également la complexité du circuit de refroidissement et requiert l'emploi de rouleaux plus gros, donc plus encombrants pour assurer la même résistance mécanique que des rouleaux massifs.Installing sprinklers for cooling the rollers by spraying water increases the complexity and size of the cooling device. Furthermore, the use of hollow rollers with internal cooling also increases the complexity of the cooling circuit and requires the use of larger rollers, therefore more bulky to ensure the same mechanical resistance as solid rollers.

La présente invention a pour objet de proposer un procédé et un dispositif pour supporter un produit métallique coulé en continu, quelle que soit la largeur de ce produit, en faisant appel à des moyens simples qui préviennent toute déformation des rouleaux de support. Le procédé et le dispositif de l'invention sont applicables aussi bien en coulée continue classique qu'en coulée continue de produits minces, avec ou sans laminage.The object of the present invention is to provide a method and a device for supporting a continuously cast metal product, whatever the width of this product, using simple means which prevent any deformation of the support rollers. The method and the device of the invention are applicable both in conventional continuous casting as in continuous casting of thin products, with or without rolling.

Conformément à la présente invention, un procédé pour supporter un produit métallique coulé en continu, dans lequel on supporte ledit produit métallique au moyen d'une pluralité de rouleaux de support s'étendant suivant la largeur dudit produit métallique et se succédant le long de la trajectoire suivie par ce produit, est caractérisé en ce que l'on forme individuellement à la surface d'au moins un desdits rouleaux de support une couche d'un liquide de refroidissement sous pression s'étendant en direction longitudinale substantiellement sur toute la longueur dudit rouleau de support et en direction circonférentielle sur un arc correspondant à un angle au centre d'au moins 90°, ladite couche de liquide de refroidissement sous pression étant substantiellement diamétralement opposée à la région de contact dudit rouleau de support avec le produit métallique, et en ce que l'on assure l'écoulement d'au moins une partie dudit liquide de refroidissement sous pression sur la surface latérale dudit rouleau de support, au-delà de ladite couche.According to the present invention, a method for supporting a continuously cast metal product, in which said metal product is supported by means of a plurality of support rollers extending along the width of said metal product and succeeding each other along the trajectory followed by this product, is characterized in that individually formed on the surface of at least one of said support rollers a layer of coolant under pressure extending in longitudinal direction substantially over the entire length of said support roll and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said layer of pressurized coolant being substantially diametrically opposite at the region of contact of said support roller with the metallic product, and in that it ensures the flow of at least part of said coolant under pressure on the lateral surface of said support roller, beyond said layer.

Suivant une mise en oeuvre particulière de ce procédé, on assure l'écoulement d'au moins une partie dudit liquide de refroidissement sous pression sur la surface dudit produit métallique.According to a particular implementation of this method, it ensures the flow of at least a portion of said pressurized coolant over the surface of said metal product.

Suivant l'invention, la pression régnant dans la couche de liquide de refroidissement peut être différente à chaque rouleau de support. En particulier, il peut être intéressant de faire varier progressivement ladite pression d'un rouleau de support au suivant, le long dudit produit métallique.According to the invention, the pressure prevailing in the coolant layer can be different with each support roll. In particular, it may be advantageous to vary said pressure progressively from one support roller to the next, along said metal product.

Conformément à un autre aspect qui a été évoqué plus haut, la présente invention concerne également un dispositif pour supporter un produit métallique coulé en continu, en application du procédé qui vient d'être décrit.In accordance with another aspect which has been mentioned above, the present invention also relates to a device for supporting a continuously cast metal product, in application of the method which has just been described.

A cet effet, un dispositif pour supporter un produit métallique coulé en continu, qui comprend une pluralité de rouleaux de support s'étendant suivant la largeur dudit produit métallique et se succédant le long de la trajectoire suivie par ce produit, est caractérisé en ce qu'il comporte au moins une paroi adjacente respectivement à l'un desdits rouleaux de support, en ce que ladite paroi épouse à distance la forme dudit rouleau de support de façon à définir avec celui-ci une portion de volume annulaire, en ce que ladite portion de volume annulaire s'étend en direction longitudinale substantiellement sur toute la longueur dudit rouleau de support et en direction circonférentielle sur un arc correspondant à un angle au centre d'au moins 90°, ladite portion de volume annulaire étant substantiellement diamétralement opposée à la région de contact dudit rouleau de support avec le produit métallique, et en ce que ladite portion de volume annulaire est pourvue de moyens d'entrée et de moyens de sortie d'un liquide de refroidissement.To this end, a device for supporting a continuously cast metal product, which comprises a plurality of support rollers extending along the width of said metal product and succeeding each other along the path followed by this product, is characterized in that 'It comprises at least one wall respectively adjacent to one of said support rollers, in that said wall remotely follows the shape of said support roller so as to define therewith a portion of annular volume, in that said portion of annular volume extends in longitudinal direction substantially over the entire length of said support roller and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said portion of annular volume being substantially diametrically opposite to the contact region of said support roller with the metallic product, and in that said annular volume portion is provided with hub ns inlet and outlet for a coolant.

Suivant une réalisation particulière de ce dispositif, ladite paroi constitue la face concave de la cavité d'un palier hydraulique, qui est coaxiale audit rouleau de support.According to a particular embodiment of this device, said wall constitutes the concave face of the cavity of a hydraulic bearing, which is coaxial with said support roller.

Selon une autre caractéristique du dispositif de l'invention, il est prévu le long des bords longitudinaux de ladite portion de volume annulaire, des moyens d'étranglement, de préférence réglables, pour faire varier la section de sortie de ladite portion de volume annulaire le long desdits bords longitudinaux.According to another characteristic of the device of the invention, there is provided along the longitudinal edges of said portion of annular volume, throttling means, preferably adjustable, to vary the outlet section of said portion of annular volume. along said longitudinal edges.

Selon encore une autre caractéristique du dispositif de l'invention, il est prévu des moyens de guidage prolongeant ladite paroi dans la direction circonférentielle au-delà desdits moyens d'étranglement, lesdits moyens de guidage épousant également la forme dudit rouleau de support et s'étendant jusqu'à une faible distance du produit métallique coulé en continu.According to yet another characteristic of the device of the invention, there are provided guide means extending said wall in the circumferential direction beyond said throttling means, said guide means also conforming to the shape of said support roller and extending to a small distance from the continuously cast metal product.

Suivant une caractéristique supplémentaire du dispositif de l'invention, les moyens de guidage précités sont pourvus, à leur extrémité proche du produit métallique, d'ailettes sensiblement parallèles audit produit métallique et orientées vers l'extérieur par rapport au rouleau de support auquel lesdits moyens de guidage sont associés.According to an additional characteristic of the device of the invention, the aforementioned guide means are provided, at their end close to the metal product, fins substantially parallel to said metal product and oriented outwards relative to the support roller to which said means are associated.

L'invention sera maintenant décrite en détail en faisant référence à l'unique figure annexée, qui illustre un dispositif conforme à l'invention appliqué au support, avec laminage, d'une brame mince en acier coulée en continu.The invention will now be described in detail with reference to the single appended figure, which illustrates a device according to the invention applied to the support, with rolling, of a thin steel slab continuously cast.

Cette figure ne constitue qu'une représentation schématique, sans échelle particulière, ne comportant que les éléments nécessaires à la compréhension de l'invention. Par ailleurs, elle ne montre qu'un seul rouleau de support, mais il va de soi qu'un nombre quelconque de rouleaux de support d'une installation de coulée continue peuvent être appuyés conformément aux enseignements de la présente invention. Cette figure montre une coupe à travers un dispositif conforme à l'invention, coupe qui est effectuée suivant un plan perpendiculaire à l'axe longitudinal dudit rouleau de support.This figure is only a schematic representation, without particular scale, comprising only the elements necessary for understanding the invention. Furthermore, it shows only one support roll, but it goes without saying that any number of support rolls of a continuous casting installation can be supported in accordance with the teachings of the present invention. This figure shows a section through a device according to the invention, section which is made along a plane perpendicular to the longitudinal axis of said support roll.

Dans cette vue en coupe, on a représenté une brame de coulée continue 1, provenant d'une lingotière de type connu (non représentée) et se déplaçant dans le sens indiqué par la flèche 2. Pour simplifier le dessin, on n'a reproduit qu'une demi-épaisseur de la brame.In this sectional view, there is shown a continuous casting slab 1, coming from a mold of known type (not shown) and moving in the direction indicated by the arrow 2. To simplify the drawing, no reproductions have been made. only half the thickness of the slab.

Comme on le voit dans la figure, la brame subit ici un laminage sous l'action de rouleaux 3, dont un seul est représenté.As can be seen in the figure, the slab here undergoes rolling under the action of rollers 3, only one of which is shown.

Du côté opposé du rouleau de support 3 par rapport à la brame 1, est disposé un palier 4 qui prend appui sur une assise fixe, par exemple sur le bâti de la machine de coulée. Il faut souligner que la position de ce palier 4 est en principe fixe pendant une opération de coulée continue; cette position peut cependant être modifiée pour des opérations de coulée différentes, notamment en fonction de l'épaisseur de la brame ou du taux de réduction de cette épaisseur. On indiquera également que le palier 4 s'étend sur toute la longueur du rouleau de support 3, c'est-à-dire au moins sur la largeur de la brame 1. Avec un tel palier, il est évidemment inutile de prévoir des rouleaux d'appui du rouleau de support 3. Le palier 4 présente une cavité semi-cylindrique 5, tournée vers la brame 1, dans laquelle est logé le rouleau de support 3. La cavité 5 est de préférence coaxiale au rouleau de support 3, et celui-ci est disposé de façon à définir avec la cavité 5 une portion de volume annulaire 6 dont la hauteur radiale est de préférence constante. La portion de volume annulaire 6 communique par une pluralité de passages 7 avec une source de liquide de refroidissement sous pression, non représentée. Ces passages 7 peuvent être disposés de toute manière appropriée; ils sont de préférence répartis uniformément suivant la longueur du palier 4.On the opposite side of the support roller 3 with respect to the slab 1, a bearing 4 is arranged which bears on a fixed seat, for example on the frame of the casting machine. It should be emphasized that the position of this bearing 4 is in principle fixed during a continuous casting operation; this position can however be modified for different casting operations, in particular as a function of the thickness of the slab or the reduction rate of this thickness. It will also be indicated that the bearing 4 extends over the entire length of the support roller 3, that is to say at least over the width of the slab 1. With such a bearing, it is obviously unnecessary to provide rollers for supporting the support roller 3. The bearing 4 has a semi-cylindrical cavity 5, facing the slab 1, in which is housed the support roller 3. The cavity 5 is preferably coaxial with the support roller 3, and the latter is arranged so as to define with the cavity 5 a portion of annular volume 6 whose radial height is preferably constant. The annular volume portion 6 communicates through a plurality of passages 7 with a source of pressurized coolant, not shown. These passages 7 can be arranged in any suitable manner; they are preferably distributed uniformly along the length of the bearing 4.

Le long des bords longitudinaux de la cavité 5, sont montés des talons 8, qui peuvent être fixés à différentes distances du rouleau de support 3. Les doubles flèches expriment les possibilités de déplacement des talons 8. Ces talons 8 constituent des organes d'étranglement qui permettent de faire varier, ensemble ou séparément, les sections longitudinales d'extrémité de la portion de volume annulaire 6.Along the longitudinal edges of the cavity 5, heels 8 are mounted, which can be fixed at different distances from the support roller 3. The double arrows express the possibilities of displacement of the heels 8. These heels 8 constitute organs constrictions which make it possible to vary, together or separately, the longitudinal end sections of the annular volume portion 6.

Les talons 8 peuvent être munis de joues 9 qui épousent à distance la forme du rouleau de support 3 et qui définissent avec celui-ci des prolongements 10 de la portion de volume annulaire 6.The heels 8 can be provided with cheeks 9 which follow the shape of the support roller 3 from a distance and which define therewith extensions 10 of the annular volume portion 6.

Enfin, à leur extrémité la plus proche de la brame 1, les joues 9 peuvent comporter des ailettes 11 disposées parallèlement à la surface de la brame 1. Ces ailettes 11 définissent avec la brame 1 des tronçons de canal 12, 13, de largeur respectivement e₁ et e₂, qui s'étendent transversalement sur toute la largeur de la brame 1, en dessous et au-dessus de la zone de contact de la brame 1 avec le rouleau de support 3.Finally, at their end closest to the slab 1, the cheeks 9 may have fins 11 arranged parallel to the surface of the slab 1. These fins 11 define with the slab 1 channel sections 12, 13, of width respectively. e₁ and e₂, which extend transversely over the entire width of the slab 1, below and above the area of contact of the slab 1 with the support roller 3.

En application de la présente invention, ce dispositif fonctionne de la façon suivante.In application of the present invention, this device operates in the following manner.

Une brame 1 quittant une lingotière de coulée continue, non représentée, présente une peau solidifiée de faible épaisseur, indiquée par une zone pointillée, qui entoure un coeur encore liquide, correspondant à la partie hachurée. Cette brame descend verticalement, suivant la direction de la flèche 2, et elle pénètre dans la zone de refroidissement secondaire symbolisée par l'ensemble de rouleau de support illustre dans la figure.A slab 1 leaving a continuous casting mold, not shown, has a solidified skin of small thickness, indicated by a dotted area, which surrounds a still liquid core, corresponding to the hatched part. This slab descends vertically, in the direction of arrow 2, and it enters the secondary cooling zone symbolized by the support roller assembly illustrated in the figure.

La brame 1 arrive en contact avec une paire de rouleaux de support 3, dont un seul est représenté, qui la supportent et, éventuellement, réduisent son épaisseur, selon l'effort qu'ils exercent sur la brame. Cet effort est lui-même le résultat d'une pression appliquée au rouleau de support 3 par un liquide de refroidissement sous pression, introduit dans la portion de volume annulaire 6 par les passages 7. Ce liquide de refroidissement sous pression est fourni par une pompe ou par tout autre dispositif approprié, non représenté.The slab 1 comes into contact with a pair of support rollers 3, only one of which is shown, which support it and, optionally, reduce its thickness, depending on the force they exert on the slab. This effort is itself the result of a pressure applied to the support roller 3 by a pressurized coolant, introduced into the annular volume portion 6 through the passages 7. This pressurized coolant is supplied by a pump or by any other suitable device, not shown.

Les talons 8 sont ajustés dans une position où ils assurent la valeur désirée de la section de sortie de la portion de volume annulaire 6. Comme on le comprend aisément, une diminution de cette section de sortie entraîne une augmentation de la perte de charge due aux talons 8 et provoque par conséquent une augmentation de la pression appliquée par le liquide de refroidissement au rouleau de support 3. Il en résulte évidemment un accroissement de l'effort exercé par le rouleau de support 3 sur la brame. Le réglage de la position des talons 8 permet dès lors de modifier le serrage des rouleaux de support 3 sur la brame 1.The heels 8 are adjusted in a position where they provide the desired value of the outlet section of the annular volume portion 6. As is easily understood, a reduction in this outlet section results in an increase in the pressure drop due to the heels 8 and consequently causes an increase in the pressure applied by the coolant to the support roller 3. This obviously results in an increase in the force exerted by the support roller 3 on the slab. The adjustment of the position of the heels 8 therefore makes it possible to modify the tightening of the support rollers 3 on the slab 1.

En particulier, le dispositif de l'invention permet soit de supporter simplement la brame, soit d'effectuer un laminage de cette brame par une modification de l'effort exercé par les rouleaux de support 3. La figure illustre le cas d'un laminage qui opère une réduction d'épaisseur égale à 2 x (e₁ - e₂), e₁ et e₂ étant les distances entre la surface de la brame et le plan des ailettes 11, respectivement après et avant le rouleau de support 3. Dans le cas où l'on supporte simplement la brame, la réduction d'épaisseur est nulle puisque l'on respecte alors la condition e₁ = e₂.In particular, the device of the invention makes it possible either to simply support the slab, or to carry out a rolling of this slab by a modification of the force exerted by the support rollers 3. The figure illustrates the case of a rolling which operates a thickness reduction equal to 2 x (e₁ - e₂), e₁ and e₂ being the distances between the surface of the slab and the plane of the fins 11, respectively after and before the support roller 3. In the case where one simply supports the slab, the reduction in thickness is zero since one then respects the condition e₁ = e₂.

Par ailleurs, le liquide de refroidissement sous pression, généralement l'eau, circule dans la portion de volume annulaire 6, puis dans les prolongements 10 et enfin dans les canaux 12, 13, d'où il s'écoule le long de la brame. Il assure ainsi le refroidissement intense non seulement du rouleau de support 3, mais aussi du palier 4 et de la brame 1. Le palier 4 n'est donc plus exposé à une surchauffe et il n'est plus sujet au grippage. Le rouleau de support 3 est uniformément appuyé sur toute sa longueur et il ne se déforme pas, même sous les efforts élevés requis pour le laminage de la brame. Enfin, la brame elle-même conserve la section désirée puisque ses grandes faces sont correctement supportées.Furthermore, the pressurized coolant, generally water, circulates in the portion of annular volume 6, then in the extensions 10 and finally in the channels 12, 13, from which it flows along the slab. . It thus ensures intense cooling not only of the support roller 3, but also of the bearing 4 and of the slab 1. The bearing 4 is therefore no longer exposed to overheating and it is no longer subject to seizure. The support roller 3 is uniformly supported over its entire length and it does not deform, even under the high forces required for rolling the slab. Finally, the slab itself retains the desired section since its large faces are properly supported.

Le débit du liquide de refroidissement sous pression peut être modifié, suivant les applications, en changeant le débit d'alimentation et/ou la position des talons 8.The flow rate of the pressurized coolant can be modified, depending on the application, by changing the feed rate and / or the position of the heels 8.

L'invention n'est pas limitée au mode de réalisation qui vient d'être décrit et illustré. Il va de soi que diverses modifications peuvent y être apportées par un homme de métier sans sortir du cadre défini par les revendications qui suivent. En particulier, l'angle au centre correspondant à la portion de volume annulaire 6 ainsi que le mode d'alimentation de celle-ci peuvent être adaptés aux besoins spécifiques de chaque application.The invention is not limited to the embodiment which has just been described and illustrated. It goes without saying that various modifications can be made by a person skilled in the art without departing from the scope defined by the claims which follow. In particular, the angle at the center corresponding to the portion of annular volume 6 as well as the mode of supply thereof can be adapted to the specific needs of each application.

Claims (10)

Procédé pour supporter un produit métallique coulé en continu, dans lequel on supporte ledit produit métallique au moyen d'une pluralité de rouleaux de support s'étendant suivant la largeur dudit produit métallique et se succédant le long de la trajectoire suivie par ce produit, caractérisé en ce que l'on forme individuellement à la surface d'au moins un desdits rouleaux de support (3) une couche d'un liquide de refroidissement sous pression s'étendant en direction longitudinale substantiellement sur toute la longueur dudit rouleau de support (3) et en direction circonférentielle sur un arc correspondant à un angle au centre d'au moins 90°, ladite couche de liquide de refroidissement sous pression étant substantiellement diamétralement opposée à la région de contact dudit rouleau de support (3) avec le produit métallique (1), et en ce que l'on assure l'écoulement d'au moins une partie dudit liquide de refroidissement sous pression sur la surface latérale dudit rouleau de support (3), au-delà de ladite couche.Method for supporting a continuously cast metal product, in which said metal product is supported by means of a plurality of support rollers extending along the width of said metal product and succeeding each other along the path followed by this product, characterized in that individually formed on the surface of at least one of said support rollers (3) a layer of pressurized coolant extending in longitudinal direction substantially over the entire length of said support roller (3 ) and in a circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said layer of pressurized coolant being substantially diametrically opposite the region of contact of said support roller (3) with the metallic product ( 1), and in that it ensures the flow of at least part of said pressurized coolant on the lateral surface of said r orthe support water (3), beyond said layer. Procédé suivant la revendication 1, caractérisé en ce que l'on assure l'écoulement d'au moins une partie dudit liquide de refroidissement sous pression sur la surface latérale dudit produit métallique (1).Method according to Claim 1, characterized in that at least part of the said coolant under pressure flows over the lateral surface of the said metallic product (1). Procédé suivant l'une ou l'autre des revendications 1 et 2, caractérisé en ce que la pression dudit liquide de refroidissement est différente pour au moins deux desdits rouleaux de support (3).Method according to either of claims 1 and 2, characterized in that the pressure of said coolant is different for at least two of said support rollers (3). Dispositif pour supporter un produit métallique coulé en continu, qui comprend une pluralité de rouleaux de support (3) s'étendant suivant la largeur dudit produit métallique (1) et se succédant le long de la trajectoire suivie par ce produit, caractérisé en ce qu'il comporte au moins une paroi (5) adjacente respectivement à l'un desdits rouleaux de support (3), en ce que ladite paroi (5) épouse à distance la forme dudit rouleau de support (3) de façon à définir avec celui-ci une portion de volume annulaire (6), en ce que ladite portion de volume annulaire (6) s'étend en direction longitudinale substantiellement sur toute la longueur dudit rouleau de support (3) et en direction circonférentielle sur un arc correspondant à un angle au centre d'au moins 90°, ladite portion de volume annulaire (6) étant substantiellement diamétralement opposée à la région de contact dudit rouleau de support (3) avec le produit métallique (1), et en ce que ladite portion de volume annulaire (6) est pourvue de moyens d'entrée (7) et de moyens de sortie d'un liquide de refroidissement.Device for supporting a continuously cast metal product, which comprises a plurality of support rollers (3) extending along the width of said metal product (1) and succeeding each other along the path followed by this product, characterized in that 'it comprises at least one wall (5) adjacent respectively to one of said support rollers (3), in that said wall (5) remotely follows the shape of said support roller (3) so as to define with that here a portion of annular volume (6), in that said annular volume portion (6) extends in longitudinal direction substantially over the entire length of said support roller (3) and in circumferential direction on an arc corresponding to an angle at the center of at least 90 °, said portion of annular volume (6) being substantially diametrically opposite the region of contact of said support roller (3) with the metal product (1), and in that said portion of annular volume (6) is provided with inlet means (7) and means for outputting a coolant. Dispositif suivant la revendication 4, caractérisé en ce que ladite paroi (5) constitue la face concave de la cavité d'un palier hydraulique (4), et en ce que cette cavité est coaxiale audit rouleau de support (3).Device according to claim 4, characterized in that said wall (5) constitutes the concave face of the cavity of a hydraulic bearing (4), and in that this cavity is coaxial with said support roller (3). Dispositif suivant l'une ou l'autre des revendications 4 et 5, caractérisé en ce qu'il est prévu, le long des bords longitudinaux de ladite portion de volume annulaire (6), des moyens d'étranglement de la section de sortie de ladite portion de volume annulaire (6) le long desdits bords longitudinaux.Device according to either of Claims 4 and 5, characterized in that, along the longitudinal edges of said portion of annular volume (6), there are means for throttling the outlet section of said portion of annular volume (6) along said longitudinal edges. Dispositif suivant la revendication 6, caractérisé en ce que lesdits moyens d'étranglement comprennent des talons (8) et en ce que lesdits talons (8) peuvent être fixés, ensemble ou séparément, à différentes distances dudit rouleau de support (3).Device according to claim 6, characterized in that said throttling means comprise heels (8) and in that said heels (8) can be fixed, together or separately, at different distances from said support roller (3). Dispositif suivant l'une ou l'autre des revendications 4 à 7, caractérisé en ce qu'il est prévu des moyens de guidage, tels que des joues (9), prolongeant ladite paroi (5) dans la direction circonférentielle au-delà desdits moyens d'étranglement (8), lesdits moyens de guidge (9) épousant également la forme dudit rouleau de support (3) et s'étendant jusqu'à une faible distance dudit produit métallique (1).Device according to either of Claims 4 to 7, characterized in that guide means are provided, such as cheeks (9), extending said wall (5) in the circumferential direction beyond said throttling means (8), said guiding means (9) also conforming to the shape of said support roller (3) and extending to a short distance from said metallic product (1). Dispositif suivant la revendication 8, caractérisé en ce que lesdits moyens de guidage (9) sont pourvus, à leur extrémité proche dudit produit métallique (1), d'ailettes (11) sensiblement parallèles audit produit métallique (1) et orientées vers l'extérieur par rapport au rouleau de support (3) auquel lesdits moyens de guidage (9) sont associés.Device according to claim 8, characterized in that said guide means (9) are provided, at their end close to said metallic product (1), substantially parallel fins (11) to said metal product (1) and oriented towards the outside with respect to the support roller (3) with which said guide means (9) are associated. Dispositif suivant l'une ou l'autre des revendications 4 à 9, caractérisé en ce qu'il comporte une pluralité de passages (7) faisant communiquer ladite portion de volume annulaire (6) avec une source de liquide de refroidissement sous pression.Device according to either of claims 4 to 9, characterized in that it comprises a plurality of passages (7) communicating said portion of annular volume (6) with a source of pressurized coolant.
EP19910870054 1990-04-06 1991-04-02 A method and device for supporting a continuously cast metal product Withdrawn EP0451129A2 (en)

Applications Claiming Priority (2)

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BE9000386A BE1004076A7 (en) 1990-04-06 1990-04-06 Method and device for supporting cast metal product continuous.
BE9000386 1990-04-06

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EP0451129A2 true EP0451129A2 (en) 1991-10-09

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