EP2367648B1 - Ladle pipe for liquid metal casting plant - Google Patents

Ladle pipe for liquid metal casting plant Download PDF

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Publication number
EP2367648B1
EP2367648B1 EP20090760743 EP09760743A EP2367648B1 EP 2367648 B1 EP2367648 B1 EP 2367648B1 EP 20090760743 EP20090760743 EP 20090760743 EP 09760743 A EP09760743 A EP 09760743A EP 2367648 B1 EP2367648 B1 EP 2367648B1
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EP
European Patent Office
Prior art keywords
tube
shroud
end portion
jacket
installation
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.)
Active
Application number
EP20090760743
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German (de)
French (fr)
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EP2367648A1 (en
Inventor
Mariano Collura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vesuvius Group SA
Original Assignee
Vesuvius Group SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vesuvius Group SA filed Critical Vesuvius Group SA
Priority to EP20090760743 priority Critical patent/EP2367648B1/en
Priority to SI200930490T priority patent/SI2367648T1/en
Priority to PL09760743T priority patent/PL2367648T3/en
Publication of EP2367648A1 publication Critical patent/EP2367648A1/en
Application granted granted Critical
Publication of EP2367648B1 publication Critical patent/EP2367648B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/106—Shielding the molten jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/22—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
    • B22D41/24—Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings characterised by a rectilinearly movable plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/14—Closures
    • B22D41/44—Consumable closure means, i.e. closure means being used only once
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle

Definitions

  • the present invention relates to a casting installation for liquid metal, and in particular a pocket tube suitable for being introduced into such an installation.
  • a pocket tube is a tube comprising a channel extending substantially along an axis; the channel for the passage of liquid metal from a metallurgical vessel, such as a pocket, to a tundish.
  • a metallurgical vessel such as a pocket
  • Such a tube is introduced into the installation so that the axis of the channel is vertical and that the upper end thereof is in contact with an upstream element of the installation, while the lower end of it is immersed in the dispatcher.
  • a pocket tube comprising, at an end portion of the tube corresponding to an upper end portion of the channel, a metal casing surrounding a body of the tube, this metal casing being of thickness less than or equal to 5 millimeters.
  • Such an envelope because of its restricted dimensions, serves only to reduce the dimensional tolerances that are inevitable during the manufacture of the tube made of refractory material.
  • such an envelope is totally incompatible with the constraints (temperatures, pressure) related to the use of the tube and, consequently, it can not be envisaged to take advantage of this envelope for maintaining or positioning the tube of pocket.
  • the end portion of the tube Before introducing the tube into the installation, the end portion of the tube can be put in place in a removable rigidifying frame (see for example WO-A1-2004 / 052576 ). This frame is then placed on a support and the entire tube and frame is introduced into the casting installation, so that the end portion of the tube is in contact with the upstream element of the installation of casting.
  • a removable rigidifying frame see for example WO-A1-2004 / 052576 .
  • the subject of the invention is a pocket tube for casting liquid metal, comprising a channel for the passage of the metal extending essentially along an axis and a metal casing disposed at an end portion of the tube corresponding to one end of the channel, the envelope comprising at least a portion of thickness greater than or equal to 10 millimeters, preferably 14 millimeters, the tube also comprising means for securing to means for driving the tube, the securing means being formed on the envelope, especially on the thick part thereof.
  • the tube according to the invention is more robust that a tube of the state of the art and better withstands the stresses, including tensile stresses, that it is likely to undergo in the end portion forming the upper end of the tube when it is introduced into installation.
  • the tube further comprises securing means to tube drive means, constituted for example by a support for moving and holding the tube in the casting installation, and that its mechanical properties are sufficient, it is possible to to free from the presence of a frame.
  • the tube introduced into the installation is lighter than the casting element of the state of the art comprising both the tube and the frame. It is therefore also possible to simplify the tools that hold the pocket tube in the casting installation and move it. The costs relating to casting are thereby further reduced.
  • the thickness of the belt makes it possible to provide notches which, cooperating with a device for holding and / or positioning the pocket tube, will be used to hold, support or introduce the pocket tube in the casting position without risk. to see the metal envelope break or warp during use.
  • the notches serve as means for controlling the angular orientation of the tube along its axis relative to the upstream element, these means being capable of conferring at least three distinct orientations on the tube.
  • the casting element in particular the tube, under the pocket, according to one or more predetermined orientations. Therefore, each time the tube is reused, it is possible to control the angular orientation in which it is placed in relation to the upstream element of the installation, possibly depending on the angular orientations in which it was placed during previous uses.
  • the flow from a ladle of steel casting is slightly oriented, especially when, between the pocket and the pocket tube, is a valve, called "drawer" and having an opening adapted to be partially closed during casting.
  • this opening is in the partially closed position, the flow of liquid metal has a sinusoidal movement: it is directed more particularly towards a given portion of an inner wall of the tube, on which it is somehow reflected to be directed to a portion opposite of the wall, etc.
  • the portions of the inner wall of the pocket tube to which the flow is directed wear out more quickly than the rest of this wall, in view of the high temperature at which the liquid metal is carried.
  • the internal wear of the tube wall is standardized and the tube is not discarded due to a single portion of the tube. internal wall that would be very worn relative to others (such a configuration being possible when the orientation of the tube is random). The life of the tube is lengthened.
  • the orientation control means it is easy to guide the flow of liquid metal because it is known exactly in which position the tube will be placed in the installation.
  • the tube of gills may be provided so that the flow flows in one or more preferred directions in the distributor. This improves the efficiency of the casting.
  • the method makes it possible to manufacture the tube according to the invention in a simple and inexpensive way.
  • the tube 10 comprises a channel 11 for the passage of the metal, extending substantially along an axis, the axis being vertical when the tube is in the position of use.
  • the figure shows an upper end of the tube when it is in its position of use, that is to say an end capable of being in contact with an upstream element of the casting installation.
  • the tube comprises a tube body 12 made of refractory material and, at its end, a head 14 of square cross section of distinct shape of a cross section of the body of the tube 12, which has a circular section.
  • the cross section is defined as being normal to the axis of the channel 11.
  • the square section of the head 14 is larger than the circular cross-section of the tube body 12 and, therefore, between the head 14 and the tube body 12, the pocket tube 12 comprises a surface of return substantially horizontal and turned towards the lower end of the tube when it is in its position of use.
  • the tube head is of different shape and dimensions from the rest of the tube. It makes it possible to reproduce the dimensions of a casting element of the state of the art comprising a frame and can therefore be adapted to existing casting installations or pipe handling devices.
  • the head 14 of the tube ends with a flat contact surface 16.
  • This surface 16 is in particular adapted to come into contact with an upstream element of the installation and is stressed in tension because it slides against the element upstream.
  • a casing 17 made in one piece is arranged around an end portion of the tube body 12.
  • This envelope 17 is made of a metallic material and in particular steel and covers the entire head 14 and an upper part of the tubular portion of the tube 12.
  • the envelope 17 comprises an annular portion forming a belt 18 of greater thickness than the rest of the envelope.
  • the thickness of the belt 18 is greater than 10 millimeters, preferably 14 millimeters, while the rest of the envelope is of thickness between 2 and 7 millimeters, preferably between 4 and 6 millimeters.
  • the belt 18 of the metal casing is formed in the portion in which this casing covers the head 14.
  • the casing 17 comprises securing means 20, for example four notches, formed in the belt 18 of the casing, particularly in the lower part of this belt.
  • the four notches are identical. They make it possible to secure the tube to means for driving it, these drive means being in particular constituted by a manipulator arm of the tube or an H-holder holding the tube in the installation.
  • Each notch is located on a separate side of the head 14, in the middle of this side.
  • the notches are defined by abutment surfaces adapted to cooperate with abutment surfaces complementary to the pins of the tube support.
  • two notches, located on opposite sides of the head 14, cooperate with two pins of the support.
  • the tube comprises four notches, one can confer thereon several angular orientations along the axis of the channel relative to the support, and therefore to the upstream element of the installation. Indeed, the notches being identical and evenly distributed over the head, the tube can be placed on the support in four different orientations.
  • the metal casing 17 further comprises, in the portion covering the tubular portion of the tube, four identical fins 22 extending substantially along the axis of the channel and of triangular cross section. Each fin 22 is located under one of the notches; and the fins are spaced 90 ° apart. The fins 22 make it possible to position the tube in a desired orientation in a handling device that moves the tube 12 to the support.
  • the fins 22 are in particular intended to cooperate with notches complementary shape of the handling device and form guide means of the tube.
  • the tube comprises four fins 22, it can be placed in the handling device in several orientations along the axis of the channel relative to this device, so as to set up the tube in different orientations on the support.
  • a tube as described above eliminates the presence of a frame around it, which facilitates the introduction of the tube in the casting installation while providing a tube with sufficient rigidity to support the conditions to which he is subjected.
  • the body of the tube 12 is manufactured by extrusion, molding or pressing. Then, once it is formed, the metal casing 17 is put on the end portion of the body 12. At this moment, at the end portion of the tube, there is a space between the body of the tube 12 and the envelope 17.
  • a second material is then overmolded between the tube body 12 and the envelope 17, this material filling the space between the body of the tube 12 and the envelope 17.
  • the body of the tube and the envelope may be made of other materials than those described.
  • the head of the tube may also have another section than that described.
  • the securing means 20 to the drive means or the guide means of the tube may be of different shape and distribution.
  • the tube may comprise only two notches, or possibly, in place of these notches, a plurality of pins arranged on the metal casing and for securing the tube to the drive means.
  • the tube having sections of distinct shape can be manufactured without overmolding a second material, even if it is more complex.
  • the thickness and shape of the envelope may also be different from what has been described above, as long as the tube is rigid enough to withstand the casting process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
  • Continuous Casting (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
  • Piles And Underground Anchors (AREA)

Description

La présente invention concerne une installation de coulée pour métal liquide, et notamment un tube de poche apte à être introduit dans une telle installation.The present invention relates to a casting installation for liquid metal, and in particular a pocket tube suitable for being introduced into such an installation.

Un tube de poche est un tube comprenant un canal s'étendant essentiellement selon un axe; le canal permettant le passage de métal liquide provenant d'un récipient métallurgique, tel qu'une poche, jusqu'à un répartiteur. Un tel tube est introduit dans l'installation de manière à ce que l'axe du canal soit vertical et que l'extrémité supérieure de celui-ci soit en contact avec un élément amont de l'installation, alors que l'extrémité inférieure de celui-ci est immergée dans le répartiteur.A pocket tube is a tube comprising a channel extending substantially along an axis; the channel for the passage of liquid metal from a metallurgical vessel, such as a pocket, to a tundish. Such a tube is introduced into the installation so that the axis of the channel is vertical and that the upper end thereof is in contact with an upstream element of the installation, while the lower end of it is immersed in the dispatcher.

On connaît dans l'état de la technique un tube de poche comprenant, à une portion d'extrémité du tube correspondant à une portion d'extrémité supérieure du canal, une enveloppe métallique entourant un corps du tube, cette enveloppe métallique étant d'épaisseur inférieure ou égale à 5 millimètres. Une telle enveloppe, de par ses dimensions restreintes, ne sert qu'à réduire les tolérances dimensionnelles inévitables lors de la fabrication du tube en matériau réfractaire. En particulier, une telle enveloppe est totalement incompatible avec les contraintes (températures, pression) liées à l'utilisation du tube et, par voie de conséquence, il ne peut être envisagé de tirer avantage de cette enveloppe pour le maintien ou le positionnement du tube de poche. Ces problèmes sont encore exacerbés si l'on souhaite utiliser de tels tubes dans un dispositif d'introduction de tubes de poche par coulissement. En effet, dans un tel cas, les contraintes (traction par exemple) sont encore plus localisées que dans un dispositif conventionnel par emboitement.In the state of the art, there is known a pocket tube comprising, at an end portion of the tube corresponding to an upper end portion of the channel, a metal casing surrounding a body of the tube, this metal casing being of thickness less than or equal to 5 millimeters. Such an envelope, because of its restricted dimensions, serves only to reduce the dimensional tolerances that are inevitable during the manufacture of the tube made of refractory material. In particular, such an envelope is totally incompatible with the constraints (temperatures, pressure) related to the use of the tube and, consequently, it can not be envisaged to take advantage of this envelope for maintaining or positioning the tube of pocket. These problems are further exacerbated if it is desired to use such tubes in a device for introducing pocket tubes by sliding. Indeed, in such a case, the constraints (traction for example) are even more localized than in a conventional device by interlocking.

Avant l'introduction du tube dans l'installation, la portion d'extrémité du tube peut être mise en place dans un cadre de rigidification amovible (voir par exemple WO-A1-2004/052576 ). Ce cadre est ensuite placé sur un support et l'ensemble du tube et du cadre est introduit dans l'installation de coulée, de sorte que la portion d'extrémité du tube se trouve en contact avec l'élément amont de l'installation de coulée.Before introducing the tube into the installation, the end portion of the tube can be put in place in a removable rigidifying frame (see for example WO-A1-2004 / 052576 ). This frame is then placed on a support and the entire tube and frame is introduced into the casting installation, so that the end portion of the tube is in contact with the upstream element of the installation of casting.

La mise en place d'un tel cadre est assez longue et relativement complexe pour l'opérateur. Un tel cadre est également fort coûteux. Il existe donc un besoin de simplifier les opérations au niveau de l'installation de coulée, notamment pour diminuer les coûts liés à la coulée.The setting up of such a framework is quite long and relatively complex for the operator. Such a framework is also very expensive. There is therefore a need to simplify operations at the casting plant, in particular to reduce the costs associated with casting.

A cet effet, l'invention a pour objet un tube de poche pour coulée de métal liquide, comprenant un canal pour le passage du métal s'étendant essentiellement selon un axe et une enveloppe métallique disposée à une portion d'extrémité du tube correspondant à une extrémité du canal, l'enveloppe comprenant au moins une partie d'épaisseur supérieure ou égale à 10 millimètres, de préférence 14 millimètres, le tube comprenant également des moyens de solidarisation à des moyens d'entraînement du tube, les moyens de solidarisation étant ménagés sur l'enveloppe, notamment sur la partie épaisse de celle-ci.To this end, the subject of the invention is a pocket tube for casting liquid metal, comprising a channel for the passage of the metal extending essentially along an axis and a metal casing disposed at an end portion of the tube corresponding to one end of the channel, the envelope comprising at least a portion of thickness greater than or equal to 10 millimeters, preferably 14 millimeters, the tube also comprising means for securing to means for driving the tube, the securing means being formed on the envelope, especially on the thick part thereof.

Ainsi, du fait de l'épaisseur de son enveloppe, le tube selon l'invention est plus robuste qu'un tube de l'état de la technique et résiste mieux aux contraintes, notamment aux contraintes de traction, qu'il est susceptible de subir dans la portion d'extrémité formant l'extrémité supérieure du tube lorsque celui-ci est introduit dans l'installation. Comme le tube comprend en outre des moyens de solidarisation à des moyens d'entraînement du tube, constitués par exemple par un support permettant de déplacer et maintenir le tube dans l'installation de coulée, et que ses propriétés mécaniques sont suffisantes, on peut s'affranchir de la présence d'un cadre.Thus, because of the thickness of its envelope, the tube according to the invention is more robust that a tube of the state of the art and better withstands the stresses, including tensile stresses, that it is likely to undergo in the end portion forming the upper end of the tube when it is introduced into installation. As the tube further comprises securing means to tube drive means, constituted for example by a support for moving and holding the tube in the casting installation, and that its mechanical properties are sufficient, it is possible to to free from the presence of a frame.

Cela permet de simplifier le procédé d'introduction du tube dans l'installation puisque l'étape de mise en place du tube dans le cadre, qui demande une manipulation du tube par l'opérateur, est supprimée. La mise en place du tube dans l'installation est donc plus rapide et moins coûteuse.This simplifies the process of introduction of the tube into the installation since the step of placing the tube in the frame, which requires manipulation of the tube by the operator, is removed. The installation of the tube in the installation is therefore faster and less expensive.

En outre, lorsque le tube a déjà été utilisé et est mis au rebut, une étape de séparation du cadre et du tube, n'est plus nécessaire. Cette opération est en effet souvent rendue très difficile par les gouttes d'acier figées ayant été projetées pendant les opérations de coulée. Ces gouttes d'acier figées soudent entre elles les parties constitutives du cadre de l'état de la technique.In addition, when the tube has already been used and is discarded, a step of separating the frame and the tube, is no longer necessary. This operation is indeed often made very difficult by the frozen steel drops that were projected during the casting operations. These frozen steel drops weld together the constituent parts of the frame of the state of the art.

De plus, du fait de la suppression du cadre, le tube introduit dans l'installation est moins lourd que l'élément de coulée de l'état de la technique comprenant à la fois le tube et le cadre. Il est donc également possible de simplifier les outillages qui maintiennent le tube de poche dans l'installation de coulée et déplacent celui-ci. Les coûts relatifs à la coulée sont de ce fait encore diminués.In addition, because of the removal of the frame, the tube introduced into the installation is lighter than the casting element of the state of the art comprising both the tube and the frame. It is therefore also possible to simplify the tools that hold the pocket tube in the casting installation and move it. The costs relating to casting are thereby further reduced.

Enfin, l'épaisseur de la ceinture permet d'y ménager des encoches qui, coopérant avec un dispositif de maintien et/ou de positionnement du tube de poche, serviront à maintenir, supporter ou introduire le tube de poche en position de coulée sans risque de voir l'enveloppe métallique se rompre ou se déformer en cours d'utilisation.Finally, the thickness of the belt makes it possible to provide notches which, cooperating with a device for holding and / or positioning the pocket tube, will be used to hold, support or introduce the pocket tube in the casting position without risk. to see the metal envelope break or warp during use.

L'invention comprend également l'une ou plusieurs des caractéristiques de la liste suivante :

  • dans la portion d'extrémité, le tube comprend au moins une section transversale, normale à l'axe du canal, de forme distincte et/ou de dimensions différentes d'une section transversale d'une autre portion du tube, la section dans la portion d'extrémité étant en particulier rectangulaire, de préférence carrée. Ainsi, la section transversale de la portion d'extrémité est modifiée relativement à la section du reste du tube, généralement circulaire, de façon à s'adapter aux installations de coulée et supports existants et accueillant un tube muni d'un cadre. En outre, la portion d'extrémité ayant une section transversale carrée, le positionnement de celle-ci dans l'installation et/ou sur le support est facilité,
  • l'enveloppe métallique est réalisée en une seule pièce. On évite ainsi une opération de liaison, notamment par soudage, de différentes parties de l'enveloppe, comme cela est effectué dans l'état de la technique. On simplifie donc également le procédé de fabrication du tube. En outre, avec une enveloppe en une seule pièce, on améliore la robustesse du tube, ce qui permet de diminuer encore légèrement l'épaisseur de l'enveloppe et le poids du tube,
  • le tube comprend un corps de tube réalisé en un premier matériau, un deuxième matériau étant surmoulé sur le corps dans la portion d'extrémité du tube, en particulier entre le corps et l'enveloppe. Ainsi, un tel tube est fabriqué à l'aide d'un procédé de fabrication simple. Il est en effet plus avantageux de fabriquer le corps de tube, par exemple par moulage, pressage ou par extrusion puis de surmouler de la matière sur celui-ci que de fabriquer en une seule opération un tube comprenant deux sections différentes. Avec cette technique, le tube de forme relativement complexe est fabriqué de façon simple et peu coûteuse,
  • la partie épaisse de l'enveloppe s'étend sur au moins une circonférence du tube. Cela permet d'améliorer la robustesse du tube quelle que soit l'orientation dans laquelle celui-ci est placé dans le support et/ou dans l'installation de coulée ;
  • le tube se termine dans la portion d'extrémité par une surface plane. Dans ce cas, le tube est introduit dans l'installation de coulée par coulissement, c'est-à-dire que la surface plane surface du tube est en contact avec l'élément directement amont de l'installation et, en cours de coulée, coulisse par rapport à cet élément. Dans ce cas, les contraintes que le tube subit au niveau de la surface sont des contraintes en traction relativement importantes risquant d'endommager le tube. L'épaisseur de l'enveloppe suffit toutefois à assurer une robustesse suffisante de celui-ci, même dans le cas où le tube est introduit par coulissement dans l'installation.
The invention also includes one or more of the features of the following list:
  • in the end portion, the tube comprises at least one cross section, normal to the channel axis, of distinct shape and / or different dimensions of a cross section of another portion of the tube, the section in the end portion being in particular rectangular, preferably square. Thus, the cross section of the end portion is changed relative to the section of the remainder of the tube, generally circular, so as to adapt to existing casting facilities and supports and accommodating a tube with a frame. In addition, the end portion having a square cross section, the positioning thereof in the installation and / or on the support is facilitated,
  • the metal casing is made in one piece. This avoids a bonding operation, particularly by welding, of different parts of the envelope, as is done in the state of the art. The method for manufacturing the tube is therefore also simplified. In addition, with a one-piece envelope, the robustness of the tube is improved, which makes it possible to reduce slightly the thickness of the envelope and the weight of the tube,
  • the tube comprises a tube body made of a first material, a second material being overmolded on the body in the end portion of the tube, in particular between the body and the envelope. Thus, such a tube is manufactured using a simple manufacturing process. It is indeed more advantageous to manufacture the tube body, for example by molding, pressing or extrusion and then overmoulding material on it than to manufacture in a single operation a tube comprising two different sections. With this technique, the tube of relatively complex shape is manufactured simply and inexpensively,
  • the thick part of the envelope extends over at least one circumference of the tube. This improves the robustness of the tube regardless of the orientation in which it is placed in the support and / or in the casting installation;
  • the tube ends in the end portion by a flat surface. In this case, the tube is introduced into the sliding casting installation, that is to say that the flat surface surface of the tube is in contact with the element directly upstream of the installation and, during casting , slide with respect to this element. In this case, the stresses that the tube undergoes at the surface are relatively large tensile stresses that could damage the tube. The thickness of the envelope, however, is sufficient to ensure sufficient strength thereof, even in the case where the tube is slid into the installation.

Avantageusement, les encoches servent de moyens pour contrôler l'orientation angulaire du tube selon son axe par rapport à l'élément amont, ces moyens étant aptes à conférer au moins trois orientations distinctes au tube. Ainsi, on peut introduire l'élément de coulée, notamment le tube, sous la poche, selon une ou plusieurs orientations prédéterminées. De ce fait, à chaque réutilisation du tube, on peut contrôler l'orientation angulaire dans laquelle on va placer celui-ci relativement à l'élément amont de l'installation, éventuellement en fonction des orientations angulaires dans lesquelles on l'a placé lors des précédentes utilisations.Advantageously, the notches serve as means for controlling the angular orientation of the tube along its axis relative to the upstream element, these means being capable of conferring at least three distinct orientations on the tube. Thus, it is possible to introduce the casting element, in particular the tube, under the pocket, according to one or more predetermined orientations. Therefore, each time the tube is reused, it is possible to control the angular orientation in which it is placed in relation to the upstream element of the installation, possibly depending on the angular orientations in which it was placed during previous uses.

On peut alors obtenir une meilleure distribution de l'usure interne du tube. En effet, le flux issu d'une poche de coulée d'acier est légèrement orienté, d'autant plus lorsque, entre la poche et le tube de poche, se trouve une valve, dite « à tiroir » et comportant une ouverture apte à être partiellement obturée lors de la coulée. Lorsque cette ouverture est en position partiellement obturée, le flux de métal liquide a un mouvement sinusoïdal : il est dirigé plus particulièrement vers une portion donnée d'une paroi interne du tube, sur laquelle il est en quelque sorte réfléchi pour être dirigé vers une portion opposée de la paroi, etc. Or, les portions de la paroi interne du tube de poche vers lesquelles est dirigé le flux s'usent plus rapidement que le reste de cette paroi, au vu de la température élevée à laquelle est porté le métal liquide. Ainsi, en répartissant en fonction des utilisations les portions de paroi les plus susceptible d'être usées, l'usure interne de la paroi du tube est uniformisée et le tube n'est pas mis au rebut du fait d'une seule portion de la paroi interne qui serait très usée relativement aux autres (une telle configuration étant possible lorsque l'orientation du tube est aléatoire). La durée de vie du tube est donc allongée.We can then obtain a better distribution of the internal wear of the tube. Indeed, the flow from a ladle of steel casting is slightly oriented, especially when, between the pocket and the pocket tube, is a valve, called "drawer" and having an opening adapted to be partially closed during casting. When this opening is in the partially closed position, the flow of liquid metal has a sinusoidal movement: it is directed more particularly towards a given portion of an inner wall of the tube, on which it is somehow reflected to be directed to a portion opposite of the wall, etc. However, the portions of the inner wall of the pocket tube to which the flow is directed wear out more quickly than the rest of this wall, in view of the high temperature at which the liquid metal is carried. Thus, by dividing the most likely wall portions according to uses, the internal wear of the tube wall is standardized and the tube is not discarded due to a single portion of the tube. internal wall that would be very worn relative to others (such a configuration being possible when the orientation of the tube is random). The life of the tube is lengthened.

En outre, grâce aux moyens de contrôle de l'orientation, il est aisé d'orienter le flux de métal liquide car on sait exactement en quelle position le tube sera placé dans l'installation. On pourra donc par exemple munir le tube d'ouïes pour que le flux s'écoule selon une ou plusieurs directions privilégiées dans le répartiteur. Cela permet d'améliorer l'efficacité de la coulée.In addition, thanks to the orientation control means, it is easy to guide the flow of liquid metal because it is known exactly in which position the tube will be placed in the installation. For example, the tube of gills may be provided so that the flow flows in one or more preferred directions in the distributor. This improves the efficiency of the casting.

L'invention a également pour objet un procédé de fabrication d'un tube de poche selon l'invention comprenant un corps réalisé en premier matériau et un deuxième matériau surmoulé sur le corps, dans lequel :

  • on fabrique le corps du tube en le premier matériau,
  • on enfile sur le corps du tube l'enveloppe métallique de sorte que celle-ci soit mise en place à la portion d'extrémité du tube,
  • on surmoule le deuxième matériau entre l'enveloppe et le corps du tube.
The invention also relates to a method of manufacturing a pocket tube according to the invention comprising a body made of first material and a second material overmoulded on the body, wherein:
  • the body of the tube is made of the first material,
  • the metal casing is put on the body of the tube so that it is put in place at the end portion of the tube,
  • the second material is overmolded between the envelope and the body of the tube.

Le procédé permet de fabriquer le tube selon l'invention de façon simple et peu coûteuse.The method makes it possible to manufacture the tube according to the invention in a simple and inexpensive way.

L'invention sera mieux comprise à la lecture de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant à la figure unique représentant une vue en perspective d'une portion d'extrémité d'un tube de poche selon un mode de réalisation particulier de l'invention.The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the single figure showing a perspective view of an end portion of a pocket tube. according to a particular embodiment of the invention.

On a représenté sur la figure un tube de poche 10 pour une installation de coulée de métal liquide, notamment d'acier liquide. Le tube 10 comprend un canal 11 pour le passage du métal, s'étendant essentiellement selon un axe, l'axe étant vertical lorsque le tube est en position d'utilisation. On a notamment représenté sur la figure une extrémité supérieure du tube lorsque celui-ci est dans sa position d'utilisation, c'est à dire une extrémité apte à être en contact avec un élément amont de l'installation de coulée.There is shown in the figure a pocket tube 10 for a casting installation of liquid metal, in particular liquid steel. The tube 10 comprises a channel 11 for the passage of the metal, extending substantially along an axis, the axis being vertical when the tube is in the position of use. In particular, the figure shows an upper end of the tube when it is in its position of use, that is to say an end capable of being in contact with an upstream element of the casting installation.

Le tube comprend un corps de tube 12 réalisé en matériau réfractaire et, à son extrémité, une tête 14 de section transversale carrée de forme distincte d'une section transversale du corps du tube 12, lequel présente une section circulaire. La section transversale est définie comme étant normale à l'axe du canal 11.The tube comprises a tube body 12 made of refractory material and, at its end, a head 14 of square cross section of distinct shape of a cross section of the body of the tube 12, which has a circular section. The cross section is defined as being normal to the axis of the channel 11.

En outre, la section carrée de la tête 14 est de plus grande dimension que la section circulaire du corps de tube 12 et, de ce fait, entre la tête 14 et le corps de tube 12, le tube de poche 12 comprend une surface de retour 15 essentiellement horizontale et tournée vers l'extrémité inférieure du tube lorsque celui-ci est dans sa position d'utilisation. Ainsi, la tête du tube est de forme et de dimensions différentes du reste du tube. Elle permet de reproduire les dimensions d'un élément de coulée de l'état de la technique comprenant un cadre et peut donc être adaptée à des installations de coulée ou dispositifs de manipulation du tube existantes.In addition, the square section of the head 14 is larger than the circular cross-section of the tube body 12 and, therefore, between the head 14 and the tube body 12, the pocket tube 12 comprises a surface of return substantially horizontal and turned towards the lower end of the tube when it is in its position of use. Thus, the tube head is of different shape and dimensions from the rest of the tube. It makes it possible to reproduce the dimensions of a casting element of the state of the art comprising a frame and can therefore be adapted to existing casting installations or pipe handling devices.

A son extrémité, la tête 14 du tube se termine par une surface de contact plane 16. Cette surface 16 est notamment apte à entrer en contact avec un élément amont de l'installation et est sollicitée en traction, car elle coulisse contre l'élément amont.At its end, the head 14 of the tube ends with a flat contact surface 16. This surface 16 is in particular adapted to come into contact with an upstream element of the installation and is stressed in tension because it slides against the element upstream.

En outre, comme on le voit sur la figure, une enveloppe 17 réalisée en une seule pièce est disposée autour d'une portion d'extrémité du corps de tube 12. Cette enveloppe 17 est réalisée en un matériau métallique et notamment en acier et recouvre toute la tête 14 et une partie supérieure de la partie tubulaire du tube 12.In addition, as seen in the figure, a casing 17 made in one piece is arranged around an end portion of the tube body 12. This envelope 17 is made of a metallic material and in particular steel and covers the entire head 14 and an upper part of the tubular portion of the tube 12.

L'enveloppe 17 comprend une portion annulaire formant une ceinture 18 d'épaisseur plus importante que le reste de l'enveloppe. L'épaisseur de la ceinture 18 est supérieure à 10 millimètres, de préférence à 14 millimètres, alors que le reste de l'enveloppe est d'épaisseur comprise entre 2 et 7 millimètres, de préférence entre 4 et 6 millimètres. La ceinture 18 de l'enveloppe métallique est ménagée dans la portion dans laquelle cette enveloppe recouvre la tête 14.The envelope 17 comprises an annular portion forming a belt 18 of greater thickness than the rest of the envelope. The thickness of the belt 18 is greater than 10 millimeters, preferably 14 millimeters, while the rest of the envelope is of thickness between 2 and 7 millimeters, preferably between 4 and 6 millimeters. The belt 18 of the metal casing is formed in the portion in which this casing covers the head 14.

En outre, l'enveloppe 17 comprend des moyens de solidarisation 20, par exemple quatre encoches, ménagées dans la ceinture 18 de l'enveloppe, notamment en partie inférieure de cette ceinture. Les quatre encoches sont identiques. Elles permettent de solidariser le tube à des moyens d'entraînement de celui-ci, ces moyens d'entraînement étant notamment constitués par un bras manipulateur du tube ou un support en H maintenant le tube dans l'installation. Chaque encoche est située sur un côté distinct de la tête 14, au milieu de ce côté.In addition, the casing 17 comprises securing means 20, for example four notches, formed in the belt 18 of the casing, particularly in the lower part of this belt. The four notches are identical. They make it possible to secure the tube to means for driving it, these drive means being in particular constituted by a manipulator arm of the tube or an H-holder holding the tube in the installation. Each notch is located on a separate side of the head 14, in the middle of this side.

Les encoches sont délimitées par des surfaces de butée aptes à coopérer avec des surfaces de butée complémentaires des pions du support du tube. En particulier, deux encoches, situées sur des côtés opposés de la tête 14, coopèrent avec deux pions du support. Comme le tube comprend quatre encoches, on peut conférer à celui-ci plusieurs orientations angulaires selon l'axe du canal relativement au support, et de ce fait, à l'élément amont de l'installation. En effet, les encoches étant identiques et réparties uniformément sur la tête, le tube peut être mis en place sur le support selon quatre orientations distinctes.The notches are defined by abutment surfaces adapted to cooperate with abutment surfaces complementary to the pins of the tube support. In particular, two notches, located on opposite sides of the head 14, cooperate with two pins of the support. As the tube comprises four notches, one can confer thereon several angular orientations along the axis of the channel relative to the support, and therefore to the upstream element of the installation. Indeed, the notches being identical and evenly distributed over the head, the tube can be placed on the support in four different orientations.

L'enveloppe métallique 17 comprend en outre, dans la portion recouvrant la portion tubulaire du tube, quatre ailettes 22 identiques s'étendant essentiellement selon l'axe du canal et de section transversale triangulaire. Chaque ailette 22 est située sous une des encoches; et les ailettes sont donc espacées de 90°. Les ailettes 22 permettent de positionner le tube selon une orientation souhaitée dans un dispositif de manipulation qui permet de déplacer le tube 12 jusqu'au support.The metal casing 17 further comprises, in the portion covering the tubular portion of the tube, four identical fins 22 extending substantially along the axis of the channel and of triangular cross section. Each fin 22 is located under one of the notches; and the fins are spaced 90 ° apart. The fins 22 make it possible to position the tube in a desired orientation in a handling device that moves the tube 12 to the support.

Les ailettes 22 sont notamment destinées à coopérer avec des encoches de forme complémentaire du dispositif de manipulation et forment des moyens de guidage du tube. Comme le tube comprend quatre ailettes 22, il peut être placé dans le dispositif de manipulation en plusieurs orientations selon l'axe du canal par rapport à ce dispositif, de façon à mettre en place le tube selon différentes orientations sur le support.The fins 22 are in particular intended to cooperate with notches complementary shape of the handling device and form guide means of the tube. As the tube comprises four fins 22, it can be placed in the handling device in several orientations along the axis of the channel relative to this device, so as to set up the tube in different orientations on the support.

Un tube tel que décrit ci-dessus permet de s'affranchir de la présence d'un cadre autour de celui-ci, ce qui facilite la mise en place du tube dans l'installation de coulée tout en offrant un tube ayant une rigidité suffisante pour supporter les conditions auxquelles il est soumis.A tube as described above eliminates the presence of a frame around it, which facilitates the introduction of the tube in the casting installation while providing a tube with sufficient rigidity to support the conditions to which he is subjected.

On va maintenant décrire le procédé de fabrication du tube.The method of manufacturing the tube will now be described.

Tout d'abord, on fabrique le corps du tube 12 par extrusion, moulage ou pressage. Ensuite, une fois celui-ci formé, on enfile l'enveloppe métallique 17 sur la portion d'extrémité du corps 12. A cet instant, au niveau de la portion d'extrémité du tube, il existe un espace entre le corps du tube 12 et l'enveloppe 17.First of all, the body of the tube 12 is manufactured by extrusion, molding or pressing. Then, once it is formed, the metal casing 17 is put on the end portion of the body 12. At this moment, at the end portion of the tube, there is a space between the body of the tube 12 and the envelope 17.

On surmoule ensuite, entre le corps de tube 12 et l'enveloppe 17, un deuxième matériau, ce matériau remplissant l'espace entre le corps du tube 12 et l'enveloppe 17.A second material is then overmolded between the tube body 12 and the envelope 17, this material filling the space between the body of the tube 12 and the envelope 17.

L'intérêt d'un tel procédé de fabrication est que l'on peut fabriquer un tube à tête carrée ou ayant une toute autre forme, qui s'adapte aux installations existantes, tout en conservant un procédé de fabrication est assez simple.The advantage of such a manufacturing method is that it is possible to manufacture a square-head tube or of any other shape, which adapts to existing installations, while maintaining a manufacturing process is quite simple.

On notera que l'invention n'est pas limitée au mode de réalisation ci-dessus présenté.Note that the invention is not limited to the embodiment shown above.

Par exemple, le corps du tube et l'enveloppe peuvent être réalisés en d'autres matériaux que ceux décrits. La tête du tube peut également avoir une autre section que celle décrite.For example, the body of the tube and the envelope may be made of other materials than those described. The head of the tube may also have another section than that described.

De même, les moyens de solidarisation 20 aux moyens d'entraînement ou les moyens de guidage du tube peuvent être de forme et de répartition différentes. Par exemple, le tube peut comprendre seulement deux encoches, ou éventuellement, à la place de ces encoches, une pluralité de pions ménagés sur l'enveloppe métallique et permettant de solidariser le tube aux moyens d'entraînement.Similarly, the securing means 20 to the drive means or the guide means of the tube may be of different shape and distribution. For example, the tube may comprise only two notches, or possibly, in place of these notches, a plurality of pins arranged on the metal casing and for securing the tube to the drive means.

En outre, le tube ayant des sections de forme distincte peut être fabriqué sans surmoulage d'un deuxième matériau, même si cela est plus complexe.In addition, the tube having sections of distinct shape can be manufactured without overmolding a second material, even if it is more complex.

L'épaisseur et la forme de l'enveloppe peuvent également être différentes de ce qui a été décrit plus haut, tant que le tube est suffisamment rigide pour résister au procédé de coulée.The thickness and shape of the envelope may also be different from what has been described above, as long as the tube is rigid enough to withstand the casting process.

Claims (7)

  1. Ladle shroud (10) for casting liquid metal, comprising a canal (11) along which the metal can pass, extending essentially along an axis, and a metallic jacket (17) positioned at an end portion of the shroud that corresponds to an end of the canal, characterized in that the jacket (17) comprises at least a belt (18) of a thickness greater than or equal to 10 mm, preferably of 14 mm, and in that the shroud (10) comprises means (20) of attachment to tube drive means, the attachment means being formed on the belt (18) of the jacket (17).
  2. Shroud (10) according to the preceding claim, comprising, in the end portion, at least a cross section (14) normal to the axis of the canal which differs in shape and/or size from those of a cross section of another portion of the shroud, the cross section in the end portion being, in particular, square.
  3. Shroud (10) according to any one of the preceding claims, in which the metallic jacket (17) is produced as a single piece.
  4. Shroud (10) according to any one of the preceding claims, comprising a tube body (12) made of a first material, a second material being overmoulded onto the body in the end portion of the shroud, particularly between the body (12) and the jacket (17).
  5. Shroud (10) according to any one of the preceding claims, in which the belt (18) of the jacket (17) extends over at least one circumference of the shroud.
  6. Shroud (10) according to any one of the preceding claims, ending in its end portion in a planar surface (16) to allow it to be introduced into a casting installation by sliding.
  7. Method of manufacturing a ladle shroud (10) according to claim 4, in which:
    - the tube body (12) is made of the first material,
    - the metallic jacket (17) is slipped over the tube body so that this jacket is positioned at the end portion of the shroud,
    - a part made in the second material is overmoulded between the jacket (17) and the tube body (12).
EP20090760743 2008-11-20 2009-11-19 Ladle pipe for liquid metal casting plant Active EP2367648B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20090760743 EP2367648B1 (en) 2008-11-20 2009-11-19 Ladle pipe for liquid metal casting plant
SI200930490T SI2367648T1 (en) 2008-11-20 2009-11-19 Ladle pipe for liquid metal casting plant
PL09760743T PL2367648T3 (en) 2008-11-20 2009-11-19 Ladle pipe for liquid metal casting plant

Applications Claiming Priority (3)

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EP08169499 2008-11-20
EP20090760743 EP2367648B1 (en) 2008-11-20 2009-11-19 Ladle pipe for liquid metal casting plant
PCT/EP2009/008243 WO2010057639A1 (en) 2008-11-20 2009-11-19 Ladle pipe for liquid metal casting plant

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EP2367648A1 EP2367648A1 (en) 2011-09-28
EP2367648B1 true EP2367648B1 (en) 2013-01-02

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JP (1) JP5421385B2 (en)
KR (1) KR101689901B1 (en)
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KR20110089188A (en) 2011-08-04
EP2367648A1 (en) 2011-09-28
BRPI0922006A2 (en) 2015-12-15
DK2367648T3 (en) 2013-03-25
AU2009317592B2 (en) 2014-05-22
JP5421385B2 (en) 2014-02-19
NZ593478A (en) 2012-10-26
MY161669A (en) 2017-05-15
WO2010057639A1 (en) 2010-05-27
MX2011005339A (en) 2011-06-16
CA2742862C (en) 2016-08-30
EG26547A (en) 2014-02-11
PL2367648T3 (en) 2013-05-31
BRPI0922006B1 (en) 2017-03-28
SI2367648T1 (en) 2013-03-29
US9174277B2 (en) 2015-11-03
KR101689901B1 (en) 2016-12-26
ZA201104536B (en) 2012-08-29
CN102281969B (en) 2014-05-07
CA2742862A1 (en) 2010-05-27
AU2009317592A1 (en) 2011-07-07
RU2011124590A (en) 2012-12-27
JP2012509185A (en) 2012-04-19
RU2516020C2 (en) 2014-05-20
US20110248055A1 (en) 2011-10-13
CN102281969A (en) 2011-12-14
PT2367648E (en) 2013-04-04
UA100608C2 (en) 2013-01-10
RS52686B (en) 2013-08-30
ES2402234T3 (en) 2013-04-30

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