EP0069867A1 - Means for supporting and centering a core in a mould for continuous-casting tubes - Google Patents

Means for supporting and centering a core in a mould for continuous-casting tubes Download PDF

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Publication number
EP0069867A1
EP0069867A1 EP82105179A EP82105179A EP0069867A1 EP 0069867 A1 EP0069867 A1 EP 0069867A1 EP 82105179 A EP82105179 A EP 82105179A EP 82105179 A EP82105179 A EP 82105179A EP 0069867 A1 EP0069867 A1 EP 0069867A1
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Prior art keywords
core
casting
mold
projections
head
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EP82105179A
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German (de)
French (fr)
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EP0069867B1 (en
Inventor
Yves Gourmel
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Pont a Mousson SA
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Pont a Mousson SA
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Priority to AT82105179T priority Critical patent/ATE7209T1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/006—Continuous casting of metals, i.e. casting in indefinite lengths of tubes

Definitions

  • the present invention relates to the continuous vertical casting of tubes of metals or metal alloys and applies more particularly to the continuous casting of thin cast iron tubes, using a die comprising a mold and a mandrel, or cylindrical core, coaxial with the mold, which delimit an annular space for the casting of the tube.
  • the invention relates to the centering of the core, or mandrel, in the die.
  • the problem of centering the core with respect to the die is particularly acute when it is desired to pour thin tubes, that is to say of low thickness / diameter ratio, the thickness of which does not exceed a few millimeters and in particular, as in the case of the present invention, tubes with a thickness / outside diameter ratio of less than 8% and of a thickness of less than 5 mm.
  • the slightest eccentricity of the core relative to the mold causes a significant irregularity in the thickness of the tube, around the entire periphery of the die.
  • an offset of 0.5 mm results in a significant relative irregularity which can reach from 1 to 3 mm, that is to say 33%.
  • such an offset can easily come, for example, from machining tolerances and / or from a slightly heterogeneous expansion of the core during heating.
  • the present invention therefore aims to allow precise centering of the core relative to the die, from a material whose manufacturing tolerances are usually much greater than those required for this centering or alignment, c '' ie from assemblies with large clearances.
  • the subject of this invention is in fact a device for supporting and centering a cylindrical core inside the annular die of a vertical continuous casting installation for a thin tube, comprising a casting head or box, which connects a ladle to the narrow annular space of the annular die, characterized in that it comprises in combination, for the support of the core, a ball joint between the upper end of the core and the upper part of the casting head, the core passing through this casting head with a large clearance, and, for centering the core in the mold inside the annular space of the die annular, a series of identical projections or bosses, regularly spaced on the periphery of the core and in contact with the internal wall of the mold, at the upper part or entrance of the annular die, at a level of immersion in the liquid metal during casting.
  • the core is perfectly centered relative to the mold and, therefore, perfectly aligned with the extractor as soon as the mold is itself aligned with the latter.
  • the upper end of the core is integral with a support cap with a spherical lower surface, which is supported on an annular seat with a spherical upper surface fixed above the casting head, or coaxially at the exit of the head.
  • the bosses can have various shapes ensuring specific contacts, or on very small surfaces, with the wall of the mold. In all cases they occupy a small volume compared to that of space annular and are close enough to the inlet of the die to be surrounded only by liquid metal.
  • FIG. 1 An installation for vertical continuous casting of a tube T, made of cast iron, with a low thickness / outside diameter ratio, of less than 8%, and of thickness of less than 5 mm, is shown in FIG. 1. It comprises, in known manner per se, a frame 1 which supports at its upper part a ladle 2 hermetically closed by a cover 4, which on the one hand is pierced with a filling orifice closed by a plug 6, and on the other hand is crossed by a conduit 8 connected to a source of pressurized gas, not shown.
  • the pouring ladle is extended by a pouring nozzle 10, on which is fixed in a leaktight but removable manner a pouring head or box 12, of the channel type or angled conduit, that is to say comprising a channel 14 in the extension of the pouring nozzle 1 0 and a casting basin 16, of axis XX, perpendicular to the channel 14.
  • a die 18 opens into the basin 16 and must be coaxial both with this casting basin and with a extractor device 20, also of axis XX, which is fixed under the chassis.
  • the annular die 18 comprises a mold 22 of axis XX and a mandrel, or cylindrical core, 24 which defines with this mold a narrow annular space, 26, for casting the tube (fig. 2), and must therefore also be centered. on the XX axis.
  • the mold 22 is constituted by a graphite cylinder which comprises, at its upper part, a frustoconical head or "spout" 23, immersed in the casting basin 16, and is surrounded by an envelope 30 delimiting a liner of liquid metal of low melting point cooling, connected by conduits 31 and 32 respectively to a pressure supply and to a drain.
  • an envelope 30 delimiting a liner of liquid metal of low melting point cooling, connected by conduits 31 and 32 respectively to a pressure supply and to a drain.
  • an envelope of circulating cooling water 34 is disposed around the envelope 30.
  • the assembly of the mold 22 and the cooling envelopes is held by two flanges 27 and 28; respectively upper and lower, which are fixed under the casting head 12 by means of tie rods 29-.
  • the core 24 is preferably constituted by a hollow cylinder, inside of which is mounted a heating coil 36, which occupies almost the entire internal cavity of the core but, preferably, does not extend to the 'lower end of the latter. At its upper end, the core 24 has a flared, frustoconical head, 38. As the fi clearly shows gure 2, the length of the core 24 is significantly greater than the sum of the lengths of the mold 22 and of the casting head 12, and this core passes with clearance through an orifice 40 in the upper part of this casting head, so that the head 38 protrudes outside of the latter.
  • the head 38 is supported above the casting head 12 by a cap 42 threaded on the core 24, with the interposition of a sheath 44 having a cylindrical part and a frustoconical part 45 which adapts to the shape of the head flared 38.
  • the upper surface 43 of the cap 42 is planar, but its lower surface 46 is spherical and rests on the upper surface 48, of corresponding shape, of a seat 50 fixed, for example by screws 52, on the head casting 12.
  • the seat 50 is annular and is coaxial with the orifice 40 for passage of the core 24.
  • the cap 42 is strictly integral with the core 24 and the head 38, because it is fixed by means of bolts 56, or the like, on a flange 58 which surrounds the head 38 and is supported on the end of the sheath 44 , and which is further suspended by means of bolts 62, or other similar members, from an upper flange 60 tightly applied against the upper face of the head 38.
  • the device for supporting or suspending the core 24 is therefore essentially constituted by the head 38, the sleeve 44 and the seat 50 fixed on the casting head 12.
  • a combination of spherical surfaces 46 and 48 is considered to be a ball joint.
  • the core 24 further comprises, at an intermediate point, a series of projections or bosses 70, regularly distributed over its periphery.
  • the projections or pads 70 are made of graphite. They come from molding with the core 24 or can be attached to the core 24. These projections 70, intended to come into contact with the internal surface of the mold 22, are located on a part of the core 24 placed at the upper part of the die annular 18, at the level of the frustoconical spout 23, therefore at the entrance to the annular die 18, to be in an area where the cast iron poured into the annular space 26 is still liquid.
  • the height or radial projection of each of the pellets 70 relative to the wall of the core 24 corresponds to the width of the annular space 26 which delimits the die.
  • the top of the pellets 70 intended to be in contact with the internal wall of the mold 22 is not planar, but is preferably curved, each pastille preferably comprising a lateral relief 71 all around its summit.
  • the patch 70 may have a square base, as shown in FIGS. 3 and 5, or a circular base as shown in 72 in FIG. 6.
  • the core 24 comprises pellets 74 which have a square base, delimited by four oblique faces 75, so that the apex 76 which comes into contact with the internal surface of the mold 22 has an extremely reduced surface and almost punctual.
  • protrusions or centering discs 70, 72, 74 carried by the core 24 are placed so as to be as close as possible to the entrance to the mold 22, that is to say the entrance to the annular die 18, at the level of the frustoconical spout 23 which is immersed in the casting basin 16, so as to be in contact only with liquid metal.
  • pellets 70, 72, 74, as well as the distance which separates them from the periphery of the core 24, are chosen so that the total volume of the pellets is small compared to that of the annular space 26, therefore of so as to oppose only a negligible obstacle to the flow of liquid iron. Consequently, the flow of the liquid is practically not modified by their presence and the pouring takes place in exactly the same way as in the absence of these pellets.
  • this mold 22 may have significant clearances relative to the head casting, due to manufacturing tolerances on the one hand, and the work of the outer sheet 13 of this head under the action of heat, on the other hand. It is therefore necessary to center the core 24 relative to the mold 22 and, consequently, to the extractor 20, and not relative to the casting head 12.
  • the sheath 44 and the cap 42 are first fixed on the core 24 and its head 38, by means of the bri- 58 and 60. Then the core 24 is introduced into the orifice 40 of the head casting and it is lowered and penetrated into the mold 22, until the centering pellets meet the internal wall of this mold and regulate the position of the core. The cap 42 then comes to press on the surface. upper 48 of the seat 50 and, whatever the position of the core 24 relative to the orifice 40 and at the casting head, these two surfaces fit closely together. The immobilization of the core 24 is then ensured by the lugs 64 held by the studs 66 and the nuts 68.
  • These pastilles are for example six in number, but leave a large cross section between them. Consequently, no risk of solidification, or rather of deposit followed by solidification, is to be feared in this centering zone.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Continuous Casting (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

A cap 42 with a lower spherical surface 46 is held against the flared head 38 of a casting core 24 and rests on the spherical upper surface of an annular bed 50 which is fixed above a casting head 12. The bed is coaxial with an enlarged orifice 40 for the passage of the core, and is coaxial with a casting tank 16. Projections 70 are distributed regularly around the periphery of the core and come into contact with the internal wall of a mold 22 near a die opening to center the core in the mold by possibly moving the cap in relation to the bed, before final tightening.

Description

La présente invention est relative à la coulée continue verticale de tubes en métaux ou alliages métalliques et s'applique plus particulièrement à la coulée continue de tubes en fonte de faible épaisseur, à l'aide d'une filière comportant un moule et un mandrin, ou noyau cylindrique, coaxial au moule, qui délimitent un espace annulaire pour la coulée du tube.The present invention relates to the continuous vertical casting of tubes of metals or metal alloys and applies more particularly to the continuous casting of thin cast iron tubes, using a die comprising a mold and a mandrel, or cylindrical core, coaxial with the mold, which delimit an annular space for the casting of the tube.

Plus précisément, l'invention concerne le centrage du noyau, ou mandrin, dans la filière.More specifically, the invention relates to the centering of the core, or mandrel, in the die.

Le problème du centrage du noyau par rapport à la filière est particulièrement aigu lorsque l'on veut couler des tubes minces, c'est-à-dire de faible rapport épaisseur/diamètre, dont l'épaisseur ne dépasse pas quelques millimètres et notamment, comme dans le cas de la présente invention, des tubes d'un rapport épaisseur/ diamètre extérieur inférieur à 8% et d'une épaisseur inférieure à 5 mm. En effet, le moindre excentrement du noyau par rapport au moule provoque une irrégularité importante dans l'épaisseur du tube, sur tout le pourtour de la filière. Par exemple, pour une épaisseur désirée de 3 mm, un excentrement de 0,5mm entraîne une irrégularité relative importante pouvant atteindre de 1 à 3 mm, c'est-à-dire 33%. Or un tel excentrement peut facilement provenir, par exemple, des tolérances d'usinage et/ou d'une dilatation légèrement hétérogène du noyau lors du chauffage.The problem of centering the core with respect to the die is particularly acute when it is desired to pour thin tubes, that is to say of low thickness / diameter ratio, the thickness of which does not exceed a few millimeters and in particular, as in the case of the present invention, tubes with a thickness / outside diameter ratio of less than 8% and of a thickness of less than 5 mm. Indeed, the slightest eccentricity of the core relative to the mold causes a significant irregularity in the thickness of the tube, around the entire periphery of the die. For example, for a desired thickness of 3 mm, an offset of 0.5 mm results in a significant relative irregularity which can reach from 1 to 3 mm, that is to say 33%. However, such an offset can easily come, for example, from machining tolerances and / or from a slightly heterogeneous expansion of the core during heating.

En effet, lorsque, selon une technique connue par le brevet FR 2 415 501 de la demanderesse, le centrage du noyau est réalisé par ajustement de ce dernier dans un orifice supérieur de la tête ou caisson de coulée, les tolérances de fabrication de cette tête de coulée, ou du caisson, et des orifices destinés à être traversés par le noyau sont trop larges pour des épaisseurs très faibles, et notamment inférieures à 5 mm, et le centrage du noyau est difficile à réaliser.Indeed, when, according to a technique known by patent FR 2 415 501 of the applicant, the centering of the core is carried out by adjusting the latter in an upper orifice of the head or casting box, the manufacturing tolerances of this head casting, or of the box, and orifices intended to be traversed by the core are too wide for very small thicknesses, and in particular less than 5 mm, and the centering of the core is difficult to achieve.

Selon une autre technique connue par le brevet FR 1 485 055, c'est un assemblage à manchon ou fourreau et à palier de guidage emmanché à la presse dans le manchon, ou fourreau, qui assure un centrage précis du mandrin par rapport à la filière de coulée d'un tube. Cependant une telle technique fait appel à un ajustage précis et difficile à réaliser.According to another technique known from patent FR 1 485 055, it is a sleeve or sleeve assembly and a guide bearing fitted to the press in the sleeve, or sleeve, which ensures precise centering of the mandrel relative to the die. pouring a tube. However, such a technique requires precise adjustment which is difficult to carry out.

On fait encore appel à un ajustage précis, difficile et coûteux, si on utilise, comme connu, un noyau à portée de centrage dans le moule ou la coquille.It still uses a precise adjustment, difficult and expensive, if using, as known, a core centering range in the mold or the shell.

Dans une autre technique antérieure (brevet FR 2 077 405), utilisant une lingotière pour la fabrication de profilés tubulaires, le problème du centrage du mandrin par rapport à la lingotière est résolu au moyen d'une embase cylindrique appartenant au mandrin et insérée dans un évidement cylindrique correspondant de la lingotière avec, en outre, un filetage pour immobiliser axialement le mandrin dans la lingotière. Outre que ce montage comporte un filetage difficile à usiner, il n'apporte pas une solution satisfaisante au problème de la coulée continue de tubes minces en fonte.In another prior art (patent FR 2 077 405), using an ingot mold for the manufacture of tubular profiles, the problem of centering the mandrel relative to the ingot mold is resolved by means of a cylindrical base belonging to the mandrel and inserted in a corresponding cylindrical recess of the mold with, in addition, a thread for axially immobilizing the mandrel in the mold. Besides that this assembly comprises a thread which is difficult to machine, it does not provide a satisfactory solution to the problem of the continuous casting of thin cast iron tubes.

La présente invention a donc pour but de permettre un centrage précis du noyau par rapport à la filière, à partir d'un matériel dont les tolérances de fabrication sont habituellement largement supérieures à celles que l'on exige pour ce centrage ou cet alignement, c'est-à-dire à partir d'assemblages à jeux importants.The present invention therefore aims to allow precise centering of the core relative to the die, from a material whose manufacturing tolerances are usually much greater than those required for this centering or alignment, c '' ie from assemblies with large clearances.

Cette invention a en effet pour objet un dispositif de support et de centrage d'un noyau cylindrique à l'intérieur de la filière annulaire d'une installation de coulée continue verticale d'un tube mince, comportant une tête ou caisson de coulée, qui relie une poche de coulée à l'espace annulaire étroit de la filière annulaire, caractérisé en ce qu'il comporte en combinaison, pour le support du noyau, une articulation à rotule entre l'extrémité supérieure du noyau et la partie supérieure de la tête de coulée, le noyau traversant avec un jeu important cette tête de coulée, et, pour le centrage du noyau dans le moule à l'intérieur de l'espace annulaire de la filière annulaire, une série de saillies ou bossages identiques, régulièrement espacés sur la périphérie du noyau et en contact avec la paroi interne du moule, à la partie supérieure ou entrée de la filière annulaire, à un niveau d'immersion dans le métal liquide lors de la coulée.The subject of this invention is in fact a device for supporting and centering a cylindrical core inside the annular die of a vertical continuous casting installation for a thin tube, comprising a casting head or box, which connects a ladle to the narrow annular space of the annular die, characterized in that it comprises in combination, for the support of the core, a ball joint between the upper end of the core and the upper part of the casting head, the core passing through this casting head with a large clearance, and, for centering the core in the mold inside the annular space of the die annular, a series of identical projections or bosses, regularly spaced on the periphery of the core and in contact with the internal wall of the mold, at the upper part or entrance of the annular die, at a level of immersion in the liquid metal during casting.

Grâce à la combinaison du support articulé à rotule, au-dessus du caisson, allant de pair avec un montage avec jeu de la partie supérieure du noyau, au travers du caisson, et des saillies ou bossages de centrage disposés plus bas, à la partie inférieure du caisson, à l'entrée de la filière annulaire, le noyau est parfaitement centré par rapport au moule et, de ce fait, parfaitement aligné avec l'extracteur dès lors que le moule est lui-même aligné avec ce dernier.Thanks to the combination of the articulated ball joint support, above the box, going hand in hand with a mounting with clearance of the upper part of the core, through the box, and the projections or centering bosses arranged lower, at the part bottom of the box, at the entrance to the annular die, the core is perfectly centered relative to the mold and, therefore, perfectly aligned with the extractor as soon as the mold is itself aligned with the latter.

Selon un mode de réalisation préféré, l'extrémité supérieure du noyau est solidaire d'une calotte de support à surface inférieure sphérique, qui est en appui sur une assise annulaire à surface supérieure sphérique fixée au-dessus de la tête de coulée, ou coaxialement à la sortie de la tête.According to a preferred embodiment, the upper end of the core is integral with a support cap with a spherical lower surface, which is supported on an annular seat with a spherical upper surface fixed above the casting head, or coaxially at the exit of the head.

La simple introduction du noyau dans le moule et la venue des bossages en contact avec la paroi de ce moule, centrent automatiquement le noyau par rapport à la filière elle-même et mettent la calotte en appui stable et sur sur l'assise annulaire, quel que soit l'excentrement de la filière par rapport à cette assise.The simple introduction of the core into the mold and the coming of the bosses in contact with the wall of this mold, automatically center the core relative to the die itself and put the cap in stable support and on the annular seat, which that is the eccentricity of the die compared to this base.

Les bossages peuvent avoir des formes diverses assurant des contacts ponctuels, ou sur de très petites surfaces, avec la paroi du.moule. Dans tous les cas ils occupent un volume faible par rapport à celui de l'espace annulaire et sont suffisamment près de l'entrée de la filière pour n'être entourés que par du métal liquide.The bosses can have various shapes ensuring specific contacts, or on very small surfaces, with the wall of the mold. In all cases they occupy a small volume compared to that of space annular and are close enough to the inlet of the die to be surrounded only by liquid metal.

La description ci-dessous d'un mode de réalisation donné à titre d'exemple non limitatif, et représenté aux dessins annexés, fera d'ailleurs ressortir-les avantages et caractéristiques de l'invention.The description below of an embodiment given by way of nonlimiting example, and represented in the appended drawings, will moreover highlight the advantages and characteristics of the invention.

Sur ces dessins :

  • - la fig. 1 est une vue schématique en élévation, avec coupe partielle et à petite échelle, d'une installation de coulée continue avec filière annulaire suivant l'invention, en cours de coulée d'un tube;
  • - la fig. 2 est une vue schématique partielle en coupe, à beaucoup plus grande échelle, de l'installation de la figure 1, et plus particulièrement de la filière annulaire et de ses moyens de support, les saillies de centrage étant représentées de manière très schématique;
  • - la fig. 3 est une vue partielle à plus grande échelle encore, du noyau et de ses bossages de centrage par rapport au moule;
  • - la fig. 4 est une vue partielle en coupe méridienne d'une variante de saillie de centrage du noyau;
  • - la fig. 5 est une vue de face de la saillie de la figure 4;
  • - la fig. 6 est une vue partielle 'analogue à la figure 5, d'une autre variante de saillie de centrage.
In these drawings:
  • - fig. 1 is a schematic elevational view, with partial section and on a small scale, of a continuous casting installation with an annular die according to the invention, during the casting of a tube;
  • - fig. 2 is a partial schematic sectional view, on a much larger scale, of the installation of FIG. 1, and more particularly of the annular die and of its support means, the centering projections being shown very schematically;
  • - fig. 3 is a partial view on a still larger scale of the core and its centering bosses relative to the mold;
  • - fig. 4 is a partial view in meridian section of a variant of the core centering projection;
  • - fig. 5 is a front view of the projection of FIG. 4;
  • - fig. 6 is a partial view, similar to FIG. 5, of another variant of the centering projection.

Une installation de coulée continue verticale d'un tube T, en fonte, de rapport épaisseur/diamètre extérieur faible, inférieur à 8%, et d'épaisseur inférieure à 5 mm, est représentée sur la figure 1. Elle comporte, de manière connue en soi, un bâti 1 qui supporte à sa partie supérieure une poche de coulée 2 fermée hermétiquement par un couvercle 4, qui d'une part est percé d'un orifice de remplissage obturé par un bouchon 6, et d'autre part est traversé par un conduit 8 relié à une source de gaz sous pression, non représentée.An installation for vertical continuous casting of a tube T, made of cast iron, with a low thickness / outside diameter ratio, of less than 8%, and of thickness of less than 5 mm, is shown in FIG. 1. It comprises, in known manner per se, a frame 1 which supports at its upper part a ladle 2 hermetically closed by a cover 4, which on the one hand is pierced with a filling orifice closed by a plug 6, and on the other hand is crossed by a conduit 8 connected to a source of pressurized gas, not shown.

La poche de coulée est prolongée par une buse de coulée 10, sur laquelle est fixée de manière étanche mais amovible une tête de coulée ou caisson 12, du type à chenal ou conduit en équerre, c'est-à-dire comportant un chenal 14 dans le prolongement de la buse de coulée 10 et un bassin de coulée 16, d'axe XX, perpendiculaire au chenal 14. Une filière 18 débouche dans le bassin 16 et doit être coaxial à la fois à ce bassin de coulée et à un dispositif extracteur 20, également d'axe XX, qui est fixé sous le châssis.The pouring ladle is extended by a pouring nozzle 10, on which is fixed in a leaktight but removable manner a pouring head or box 12, of the channel type or angled conduit, that is to say comprising a channel 14 in the extension of the pouring nozzle 1 0 and a casting basin 16, of axis XX, perpendicular to the channel 14. A die 18 opens into the basin 16 and must be coaxial both with this casting basin and with a extractor device 20, also of axis XX, which is fixed under the chassis.

La filière annulaire 18 comporte un moule 22 d'axe XX et un mandrin, ou noyau cylindrique, 24 qui délimite avec ce moule un espace annulaire étroit, 26, de coulée du tube (fig. 2), et doit par suite également être centré sur l'axe XX.The annular die 18 comprises a mold 22 of axis XX and a mandrel, or cylindrical core, 24 which defines with this mold a narrow annular space, 26, for casting the tube (fig. 2), and must therefore also be centered. on the XX axis.

Le moule 22 est constitué par un cylindre en graphite qui comporte, à sa partie supérieure, une tête ou un "bec" tronconique 23, immergé dans le bassin de coulée 16, et est entouré par une enveloppe 30 délimitant une chemise de métal liquide de refroidissement à bas point de fusion, reliée par des conduits 31 et 32 respectivement à une alimentation sous pression et à une vidange. Autour de l'enveloppe 30 est disposée une enveloppe d'eau de refroidissement en circulation 34. L'ensemble du moule 22 et des enveloppes de refroidissement est maintenu par deux brides 27 et 28; respectivement supérieure et inférieure, qui sont fixées sous la tête de coulée 12 au moyen de tirants 29-.The mold 22 is constituted by a graphite cylinder which comprises, at its upper part, a frustoconical head or "spout" 23, immersed in the casting basin 16, and is surrounded by an envelope 30 delimiting a liner of liquid metal of low melting point cooling, connected by conduits 31 and 32 respectively to a pressure supply and to a drain. Around the envelope 30 is disposed an envelope of circulating cooling water 34. The assembly of the mold 22 and the cooling envelopes is held by two flanges 27 and 28; respectively upper and lower, which are fixed under the casting head 12 by means of tie rods 29-.

Le noyau 24 est de préférence constitué par un cylindre creux, à l'intérieur duquel est monté un serpentin de chauffage 36, qui occupe la quasi totalité de la cavité interne du noyau mais, de préférence, ne s'étend pas jusqu'à l'extrémité inférieure de ce dernier. A son extrémité supérieure le noyau 24 comporte une tête évasée, tronconique, 38. Comme le montre clairement la figure 2, la longueur du noyau 24 est nettement supérieure à la somme des longueurs du moule 22 et de la tête de coulée 12, et ce noyau traverse avec jeu un orifice 40 de la partie supérieure de cette tête de coulée, de sorte que la tête 38 fait saillie à l'extérieur de cette dernière.The core 24 is preferably constituted by a hollow cylinder, inside of which is mounted a heating coil 36, which occupies almost the entire internal cavity of the core but, preferably, does not extend to the 'lower end of the latter. At its upper end, the core 24 has a flared, frustoconical head, 38. As the fi clearly shows gure 2, the length of the core 24 is significantly greater than the sum of the lengths of the mold 22 and of the casting head 12, and this core passes with clearance through an orifice 40 in the upper part of this casting head, so that the head 38 protrudes outside of the latter.

La tête 38 est supportée au-dessus de la tête de coulée 12 par une calotte 42 enfilée sur le noyau 24, avec interposition d'un fourreau 44 ayant une partie cylindrique et une partie tronconique 45 qui s'adapte à la forme de la tête évasée 38. La surface supérieure 43 de la calotte 42 est plane, mais sa surface inférieure 46 est sphérique et repose sur la surface supérieure 48, de forme correspondante, d'une assise 50 fixée, par exemple par des vis 52, sur la tête de coulée 12. L'assise 50 est annulaire et est coaxiale à l'orifice 40 de passage du noyau 24.The head 38 is supported above the casting head 12 by a cap 42 threaded on the core 24, with the interposition of a sheath 44 having a cylindrical part and a frustoconical part 45 which adapts to the shape of the head flared 38. The upper surface 43 of the cap 42 is planar, but its lower surface 46 is spherical and rests on the upper surface 48, of corresponding shape, of a seat 50 fixed, for example by screws 52, on the head casting 12. The seat 50 is annular and is coaxial with the orifice 40 for passage of the core 24.

La calotte 42 est rigoureusement solidaire du noyau 24 et de la tête 38, car elle est fixée par l'intermédiaire de boulons 56, ou analogues, sur une bride 58 qui entoure la tête 38 et est en appui sur l'extrémité du fourreau 44, et qui en outre est suspendue au moyen de boulons 62, ou autres organes analogues, à une bride supérieure 60 étroitement appliquée contre la face supérieure de la tête 38. Le dispositif de support ou de suspension du noyau 24 est donc constitué essentiellement par la tête 38, le fourreau 44 et l'assise 50 fixée sur la tête de coulée 12. On considère comme une articulation à rotule la combinaison des surfaces sphériques 46 et 48.The cap 42 is strictly integral with the core 24 and the head 38, because it is fixed by means of bolts 56, or the like, on a flange 58 which surrounds the head 38 and is supported on the end of the sheath 44 , and which is further suspended by means of bolts 62, or other similar members, from an upper flange 60 tightly applied against the upper face of the head 38. The device for supporting or suspending the core 24 is therefore essentially constituted by the head 38, the sleeve 44 and the seat 50 fixed on the casting head 12. A combination of spherical surfaces 46 and 48 is considered to be a ball joint.

L'ensemble constitué par la tête 38 et le noyau 24, le fourreau 44 ainsi que la calotte 42 solidement maintenue par les brides 58 et 60, est immobilisé par rapport à la tête de coulée 12 grâce à des pattes de serrage 64 traversées par des goujons 66, fixés sur la tête de coulée 12, et serrées au moyen d'écrous 68 qui appliquent les pattes 64 sur la surface plane 43 de la calotte 42 et serrent ainsi cette calotte sur l'assise 50.The assembly constituted by the head 38 and the core 24, the sheath 44 as well as the cap 42 securely held by the flanges 58 and 60, is immobilized relative to the casting head 12 by means of clamping lugs 64 traversed by studs 66, fixed on the neck head lée 12, and tightened by means of nuts 68 which apply the tabs 64 to the flat surface 43 of the cap 42 and thus tighten this cap on the seat 50.

Le noyau 24 comporte en outre, en un point intermédiaire, une série de saillies ou bossages 70, régulière-' ment répartis sur sa périphérie. Les saillies ou pastilles 70 sont en graphite. Elles viennent de moulage avec le noyau 24 ou peuvent être rapportées sur le noyau 24. Ces saillies 70, destinées à venir en contact avec la surface interne du moule 22, se trouvent sur une partie du noyau 24 placée à la partie supérieure de la filière annulaire 18, à hauteur du bec tronconique 23, donc à l'entrée de la filière annulaire 18, pour être dans une zone où la fonte coulée dans l'espace annulaire 26 est encore liquide. La hauteur ou saillie radiale de chacune des pastilles 70 par rapport à la paroi du noyau 24 correspond à la largeur de l'espace annulaire 26 qui délimite la filière. Toutefois, comme le montrent plus particulièrement les figures 3 et 4, le sommet des pastilles 70 destiné à être en contact avec la paroi interne du moule 22 n'est pas plan, mais est de préférence bombé, chaque pastille comportant de préférence une dépouille latérale 71 tout autour de son sommet. La pastille 70 peut avoir une base carrée, comme représenté sur les figures 3 et 5, ou une base circulaire comme représenté en 72 sur la figure 6.The core 24 further comprises, at an intermediate point, a series of projections or bosses 70, regularly distributed over its periphery. The projections or pads 70 are made of graphite. They come from molding with the core 24 or can be attached to the core 24. These projections 70, intended to come into contact with the internal surface of the mold 22, are located on a part of the core 24 placed at the upper part of the die annular 18, at the level of the frustoconical spout 23, therefore at the entrance to the annular die 18, to be in an area where the cast iron poured into the annular space 26 is still liquid. The height or radial projection of each of the pellets 70 relative to the wall of the core 24 corresponds to the width of the annular space 26 which delimits the die. However, as shown more particularly in Figures 3 and 4, the top of the pellets 70 intended to be in contact with the internal wall of the mold 22 is not planar, but is preferably curved, each pastille preferably comprising a lateral relief 71 all around its summit. The patch 70 may have a square base, as shown in FIGS. 3 and 5, or a circular base as shown in 72 in FIG. 6.

Selon la variante de la figure 5, le noyau 24 comporte des pastilles 74 qui ont une base carrée, délimitée par quatre pans obliques 75, de sorte que le sommet 76 qui entre en contact avec la surface interne du moule 22 a une surface extrêmement réduite et presque ponctuelle.According to the variant of FIG. 5, the core 24 comprises pellets 74 which have a square base, delimited by four oblique faces 75, so that the apex 76 which comes into contact with the internal surface of the mold 22 has an extremely reduced surface and almost punctual.

Quels que soient la forme et le mode de réalisation des saillies ou pastilles de centrage 70, 72, 74 portées par le noyau 24, celles-ci sont placées de manière à se trouver le plus près possible de l'entrée du moule 22, c'est-à-dire de l'entrée de la filière annulaire 18, à hauteur du bec tronconique 23 qui est immergé dans le bassin de coulée 16, de façon à ne se trouver en contact qu'avec du métal liquide.Whatever the shape and the embodiment of the protrusions or centering discs 70, 72, 74 carried by the core 24, these are placed so as to be as close as possible to the entrance to the mold 22, that is to say the entrance to the annular die 18, at the level of the frustoconical spout 23 which is immersed in the casting basin 16, so as to be in contact only with liquid metal.

Les dimensions des pastilles 70, 72, 74, de même que la distance qui les sépare sur la périphérie du noyau 24, sont choisies de manière que le volume total des pastilles soit faible par rapport à celui de l'espace annulaire 26, donc de manière à n'opposer qu'un obstacle négligeable à l'écoulement de la fonte liquide. Par suite, l'écoulement du liquide n'est pratiquement pas modifié par leur présence et la coulée s'effectue exactement de la même manière qu'en l'absence de ces pastilles.The dimensions of the pellets 70, 72, 74, as well as the distance which separates them from the periphery of the core 24, are chosen so that the total volume of the pellets is small compared to that of the annular space 26, therefore of so as to oppose only a negligible obstacle to the flow of liquid iron. Consequently, the flow of the liquid is practically not modified by their presence and the pouring takes place in exactly the same way as in the absence of these pellets.

Le centrage du noyau par rapport au moule, e-t par suite la régularité et la qualité du tube produit, sont considérablement améliorés.The centering of the core in relation to the mold, and consequently the regularity and the quality of the tube produced, are considerably improved.

En effet, lors du montage de l'installation, lorsque le moule 22 a été monté sur la tête de coulée 12 et parfaitement aligné avec l'axe XX du dispositif extracteur 20, ce moule 22 peut présenter des jeux importants par rapport à la tête de coulée, en raison des tolérances de fabrication d'une part, et du travail de la tôle extérieure 13 de cette tête sous l'action de la chaleur, d'autre part. Il est donc nécessaire de centrer le noyau 24 par rapport au moule 22 et, par suite, à l'extracteur 20, et non par rapport à la tête de coulée 12.In fact, during assembly of the installation, when the mold 22 has been mounted on the casting head 12 and perfectly aligned with the axis XX of the extractor device 20, this mold 22 may have significant clearances relative to the head casting, due to manufacturing tolerances on the one hand, and the work of the outer sheet 13 of this head under the action of heat, on the other hand. It is therefore necessary to center the core 24 relative to the mold 22 and, consequently, to the extractor 20, and not relative to the casting head 12.

Dans ce but on fixe d'abord le fourreau 44 et la calotte 42 sur le noyau 24 et sa tête 38, au moyen des bri-' des 58 et 60. Puis on introduit le noyau 24 dans l'orifice 40 de la tête de coulée et on le fait descendre et pénétrer dans le moule 22, jusqu'à ce que les pastilles de centrage rencontrent la paroi interne de ce moule et règlent la position du noyau. La calotte 42 vient alors appuyer sur la surface. supérieure 48 de l'assise 50 et, quelle que soit la position du noyau 24 par rapport à l'orifice 40 et à la tête de coulée, ces deux surfaces s'emboîtent étroitement l'une dans l'autre. L'immobilisation du noyau 24 est alors assurée par les pattes 64 maintenues par les goujons 66 et les écrous 68.For this purpose, the sheath 44 and the cap 42 are first fixed on the core 24 and its head 38, by means of the bri- 58 and 60. Then the core 24 is introduced into the orifice 40 of the head casting and it is lowered and penetrated into the mold 22, until the centering pellets meet the internal wall of this mold and regulate the position of the core. The cap 42 then comes to press on the surface. upper 48 of the seat 50 and, whatever the position of the core 24 relative to the orifice 40 and at the casting head, these two surfaces fit closely together. The immobilization of the core 24 is then ensured by the lugs 64 held by the studs 66 and the nuts 68.

Bien entendu, au cours de ce montage il est encore possible,au voisinage de la position définitive de suspension du noyau 24, de vérifier la parfaite coaxiâlité de ce noyau et du moule 22, en introduisant dans l'espace annulaire 26, à sa partie inférieure, des gabarits de contrôle dont la dimension est égale à la hauteur des pastilles 70, 72 ou 74. Au cas où l'on constaterait une déviation légère du noyau, on pourrait déplacer légèrement dans le sens voulu la surface sphérique de la calotte 42 par rapport à l'assise 50 pour remettre parfaitement le noyau dans l'axe XX.Of course, during this assembly it is still possible, in the vicinity of the final position of suspension of the core 24, to check the perfect coaxiality of this core and the mold 22, by introducing into the annular space 26, at its part lower, control jigs whose dimension is equal to the height of the pellets 70, 72 or 74. In the event that there is a slight deviation of the core, the spherical surface of the cap 42 could be slightly displaced in the desired direction relative to the seat 50 to put the core perfectly in the axis XX.

Au cours de la coulée, le métal liquide contenu dans la tête de coulée, et tout particulièrement dans le.chenal 14 et dans le bassin 16, pénètre dans l'espace annulaire 26 et s'écoule dans la direction des flèches représentées sur la figure 3, entre les pastilles 70 et autour de celles-ci. Ces pastilles sont par exemple au nombre de six, mais laissent une large section de passage entre elles. En conséquence aucun risque de solidification, ou plutôt de dépôt suivi de solidification, n'est à craindre dans cette zone de centrage.During casting, the liquid metal contained in the casting head, and especially in the channel 14 and in the basin 16, enters the annular space 26 and flows in the direction of the arrows shown in the figure. 3, between the pellets 70 and around them. These pastilles are for example six in number, but leave a large cross section between them. Consequently, no risk of solidification, or rather of deposit followed by solidification, is to be feared in this centering zone.

Il est à noter que le front de solidification de la fonte, ou frontière théorique entre la fonte liquide et la fonte solidifiée en un tube T, est situé beaucoup plus bas, vers la sortie de la filière annulaire 18.It should be noted that the front for solidifying the cast iron, or theoretical border between the liquid cast iron and the cast iron solidified in a tube T, is situated much lower, towards the outlet of the annular die 18.

De même aucun risque de déplacement du noyau par rapport au moule, c'est-à-dire de décentrage du noyau, n'est à craindre au cours de la coulée. L'espace annulaire déterminant l'épaisseur de la paroi du tube coulé reste donc rigoureusement constant à tout moment et quelles que soient les tolérances de fabrication des différents organes de l'installation.Similarly, no risk of displacement of the core with respect to the mold, that is to say of decentering of the core, is to be feared during casting. The annular space determining the thickness of the wall of the poured tube therefore remains strictly constant at all times and whatever the manufacturing tolerances of the various members of the installation.

Claims (10)

1 - Dispositif de support et de centrage d'un noyau cylindrique à l'intérieur de la filière annulaire d'une installation de coulée continue verticale d'un tube mince, comportant une tête ou caisson de coulée qui relie une poche de coulée à l'espace annulaire étroit de la filière annulaire, caractérisé en ce qu'il comporte en combinaison, pour le support du noyau (24), une articulation à rotule (42, 44, 46, 48, 50) entre l'extrémité supérieure (38) du noyau (24) et la partie supérieure de la tête de coulée (12), le noyau (24) traversant avec un jeu important cette tête de coulée, et, pour le centrage du noyau (24) dans le moule (22), à l'intérieur de l'espace annulaire (26) de la filière (18), une série de saillies ou bossages identiques (70, 72, 74), régulièrement espacés sur 11 périphérie du noyau et en contact avec la paroi interne du moule (22), à la partie supérieure ou entrée de la filière annulaire (18), à un niveau d'immersion dans le-métal liquide lors de la coulée.1 - Device for supporting and centering a cylindrical core inside the annular die of a vertical continuous casting installation of a thin tube, comprising a casting head or box which connects a ladle to the narrow annular space of the annular die, characterized in that it comprises in combination, for the support of the core (24), a ball joint (42, 44, 46, 48, 50) between the upper end (38 ) of the core (24) and the upper part of the casting head (12), the core (24) passing through this casting head with a large clearance, and, for centering the core (24) in the mold (22) , inside the annular space (26) of the die (18), a series of identical projections or bosses (70, 72, 74), regularly spaced on 11 periphery of the core and in contact with the internal wall of the mold (22), at the top or entrance of the annular die (18), at a level of immersion in the liquid metal during casting. 2 - Dispositif suivant la revendication 1, caractérisé en ce que l'extrémité supérieure (38) du noyau (24) est solidaire d'une calotte de support (42) à surface inférieure sphérique (46), qui est en appui sur une assise annulaire (50) à surface supérieure (48) sphérique fixée au-dessus de la tête de coulée (12) coaxialement à la filière annulaire (18).2 - Device according to claim 1, characterized in that the upper end (38) of the core (24) is integral with a support cap (42) with a spherical lower surface (46), which is supported on a seat annular (50) with a spherical upper surface (48) fixed above the casting head (12) coaxially with the annular die (18). 3 - Dispositif suivant l'une des revendications 1 et 2, caractérisé en ce que l'extrémité supérieure du noyau (24) est une tête évasée (38), et en ce que la calotte de support (42) est serrée sous cette tête (38).3 - Device according to one of claims 1 and 2, characterized in that the upper end of the core (24) is a flared head (38), and in that the support cap (42) is clamped under this head (38). 4 - Dispositif suivant la revendication 1, caractérisé en ce que les bossages ou saillies (70, 72, 74) de centrage du noyau (24) par rapport au moule (22) se trouvent sur la périphérie du noyau, en appui sur la paroi interne du moule (22), à la partie supérieure de celui-ci au droit d'un bec tronconique (23) qui est immergé dans le bassin de coulée (16) de la tête de coulée (12).4 - Device according to claim 1, characterized in that the bosses or projections (70, 72, 74) for centering the core (24) relative to the mold (22) are located on the periphery of the core, bearing on the wall internal of the mold (22), at the top of it in line with a frustoconical spout (23) which is immersed in the casting basin (16) of the casting head (12). 5 - Dispositif suivant l'une des revendications 1 et 4, caractérisé en ce que les saillies ou bossages sont constitués par des pastilles de centrage (70,72,74) à sommet (76) ayant une surface de contact presque ponctuelle avec la paroi interne.5 - Device according to one of claims 1 and 4, characterized in that the projections or bosses are constituted by centering pads (70,72,74) at the top (76) having an almost punctual contact surface with the wall internal. 6 - Dispositif suivant la revendication 5, caractérisé en ce que le sommet (76) des saillies (70, 72, 74) est bombé.6 - Device according to claim 5, characterized in that the top (76) of the projections (70, 72, 74) is curved. 7 - Dispositif suivant l'une des revendications 5 et 6, caractérisé en ce que les saillies de centrage (70, 72, 74) comportent une dépouille de raccordement (71, 75) avec la surface périphérique du noyau (24).7 - Device according to one of claims 5 and 6, characterized in that the centering projections (70, 72, 74) comprise a connection relief (71, 75) with the peripheral surface of the core (24). 8 - Dispositif suivant l'une des revendications 5 et 7, caractérisé en ce que les saillies ou bossages (74) ont une surface de contact avec la surface interne du moule (22) qui est limitée par quatre pans obliques (75).8 - Device according to one of claims 5 and 7, characterized in that the projections or bosses (74) have a contact surface with the internal surface of the mold (22) which is limited by four oblique sides (75). 9 - Dispositif suivant l'une des revendications 1, 4, 5, 7 et 8, caractérisé en ce que les saillies ou bossages (70, 74) ont une base carrée.9 - Device according to one of claims 1, 4, 5, 7 and 8, characterized in that the projections or bosses (70, 74) have a square base. 10 - Dispositif suivant l'une des revendications 1, 4, 5 et 7, caractérisé en ce que les saillies ou bossages (72) ont une base circulaire.10 - Device according to one of claims 1, 4, 5 and 7, characterized in that the projections or bosses (72) have a circular base.
EP82105179A 1981-07-06 1982-06-14 Means for supporting and centering a core in a mould for continuous-casting tubes Expired EP0069867B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105179T ATE7209T1 (en) 1981-07-06 1982-06-14 DEVICE FOR SUPPORTING AND CENTERING A CORE IN A MOLD DURING CONTINUOUS CASTING OF TUBES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113239 1981-07-06
FR8113239A FR2508828A1 (en) 1981-07-06 1981-07-06 DEVICE FOR SUPPORTING AND CENTERING A CORE IN A CONTINUOUS CASTING DIE OF A TUBE

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EP0069867A1 true EP0069867A1 (en) 1983-01-19
EP0069867B1 EP0069867B1 (en) 1984-04-25

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EP (1) EP0069867B1 (en)
JP (1) JPS6036852B2 (en)
AT (1) ATE7209T1 (en)
BR (1) BR8203905A (en)
CA (1) CA1180878A (en)
DE (1) DE3260120D1 (en)
ES (1) ES266051Y (en)
FR (1) FR2508828A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2573683B1 (en) * 1984-11-26 1987-01-02 Pont A Mousson LIQUID METAL SUPPLY SYSTEM WITH LIQUID METAL TEMPERATURE CONTROL FOR THE CONTINUOUS CASTING OF A CAST IRON PIPE
TW312700B (en) * 1994-05-17 1997-08-11 Sony Co Ltd
FR2751249B1 (en) * 1996-07-17 1998-09-04 Pont A Mousson DEVICE FOR POSITIONING A DIE BLOCK OF A CASTING TABLE OF AN ASCENDING VERTICAL CONTINUOUS CASTING MACHINE

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1446694A (en) * 1964-09-10 1966-07-22 Kennecott Copper Corp Device for continuous casting of metal billets
FR1485055A (en) * 1965-07-01 1967-06-16 Phelps Dodge Copper Prod Improved method and apparatus for the continuous casting of metal tubes

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Publication number Priority date Publication date Assignee Title
US560484A (en) * 1896-05-19 dupont
US2502312A (en) * 1945-07-19 1950-03-28 Danner Edward Tubular glass manufacturing apparatus
SU502703A1 (en) * 1972-10-02 1976-02-15 Уральский научно-исследовательский институт черных металлов Shaper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1446694A (en) * 1964-09-10 1966-07-22 Kennecott Copper Corp Device for continuous casting of metal billets
FR1485055A (en) * 1965-07-01 1967-06-16 Phelps Dodge Copper Prod Improved method and apparatus for the continuous casting of metal tubes

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JPS6036852B2 (en) 1985-08-22
JPS5816757A (en) 1983-01-31
ATE7209T1 (en) 1984-05-15
CA1180878A (en) 1985-01-15
BR8203905A (en) 1983-06-28
FR2508828B1 (en) 1983-10-21
EP0069867B1 (en) 1984-04-25
DE3260120D1 (en) 1984-05-30
FR2508828A1 (en) 1983-01-07
ES266051Y (en) 1983-07-16
US4456053A (en) 1984-06-26
ES266051U (en) 1983-01-16

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