EP1712314A1 - Continuous casting process of metallic profiles - Google Patents

Continuous casting process of metallic profiles Download PDF

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Publication number
EP1712314A1
EP1712314A1 EP05102919A EP05102919A EP1712314A1 EP 1712314 A1 EP1712314 A1 EP 1712314A1 EP 05102919 A EP05102919 A EP 05102919A EP 05102919 A EP05102919 A EP 05102919A EP 1712314 A1 EP1712314 A1 EP 1712314A1
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EP
European Patent Office
Prior art keywords
riser
metal
baffle
mold body
continuous casting
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.)
Withdrawn
Application number
EP05102919A
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German (de)
French (fr)
Inventor
Jean-Marc Jolivet
Yann Le Papillon
Cosimo Salaris
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.)
Profilarbed SA
Original Assignee
Profilarbed 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 Profilarbed SA filed Critical Profilarbed SA
Priority to EP05102919A priority Critical patent/EP1712314A1/en
Priority to PCT/EP2006/061598 priority patent/WO2006108874A1/en
Priority to EP06725757A priority patent/EP1877211A1/en
Publication of EP1712314A1 publication Critical patent/EP1712314A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • 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
    • B22D11/009—Continuous casting of metals, i.e. casting in indefinite lengths of work of special cross-section, e.g. I-beams, U-profiles
    • 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
    • B22D11/0401—Moulds provided with a feed head
    • 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
    • B22D41/507—Pouring-nozzles giving a rotating motion to the issuing molten metal

Definitions

  • the present invention relates to a method for the continuous casting of blanks of metal profiles, in particular steel sections, in particular H-sections, having a small cross-section.
  • the continuous casting operation generally involves pouring a molten metal into a bottomless mold essentially consisting of a metal mold body, usually a tubular member, made of copper or copper alloy, defining a passage for the cast metal and whose walls are vigorously cooled by circulation of water; and to extract continuously from this mold a product already solidified externally over several millimeters thick.
  • the solidification then progresses towards the axis of the product and is completed during the descent thereof downstream of the mold in the so-called "secondary cooling" zone under the effect of watering ramps.
  • the resulting product is then cut to length and then rolled before shipment to customers or processed on site in bars, wires, profiles, plates, sheets, etc.
  • a rigid riser of refractory material is placed on the top of the tubular mold body to extend upward the inner passage of the metal tubular body in which the molten metal is cast.
  • the level of the free surface of the molten metal also called meniscus
  • the volume of molten metal in the riser acts as a buffer, damping the flow turbulence that inevitably develops under the effect of the arrival of metal.
  • the use of the riser thus makes it possible to obtain a relatively calm flow at the point where mold solidification begins, which contributes to a better quality of the solidified product and in particular to the regularity of its surface and / or to a productivity increased casting facility due to higher permitted casting speed.
  • these blanks of small cross-section blanks (generally of H, I, L or T shape) of the largest dimension - here the triple point at soul-wing intersection - hardly exceeds 30 mm and in any case never more than 50 mm, that is to say blanks whose casting space defined by the ingot mold which flows continuously is of size too small to receive a submerged nozzle, in the current state of knowledge.
  • the object of the present invention is to provide an improved method for the continuous casting of blanks of metal profiles, including blanks of small steel profiles, according to the definition given in claim 1 below.
  • the present invention therefore relates to a process for the continuous casting of blanks of metal profiles, in particular blanks of small steel sections, according to the technique of continuous casting under load in a continuous casting mold comprising a mold body supporting a refractory funnel-shaped extension.
  • the liquid metal is poured into the riser upstream of a baffle, the liquid metal being poured through a feed nozzle immersed in the liquid metal contained in the riser and the baffle being advantageously designed to dissipate most of the liquid. kinetic energy of the metal jet leaving the supply nozzle.
  • One merit of the present invention is to have realized that the continuous casting "near-net-shape" of blanks of small profiles can be carried out by applying the continuous casting known as "in vertical load” and that the calm flow of the metal melting at the level where its solidification begins is particularly important with regard to the continuous casting of small sections.
  • the liquid metal is poured from a distributor (or "tundish") in the refractory riser of the mold using a nozzle.
  • the level of liquid metal in the riser reaches a height such that the feed nozzle is immersed in the liquid metal in the riser.
  • the riser associated with the baffle minimises the free surface of the molten metal to be maintained at a distance from the ingot mold body where the solidification begins.
  • the flow of metal at the level where the solidification begins is laminar or quasi laminar, in any case very little agitated, after passing through the baffle whose role, by deviating abruptly the trajectory of the metal stream from the nozzle, is to mitigate the turbulence.
  • the riser makes it possible to direct the flow of the liquid metal progressively towards the ingot mold body.
  • This baffle arranged between the outlet of the feed nozzle and the inlet of the mold body, makes it possible to dissipate the kinetic energy of the metal jet coming out of the feed nozzle, before the flow of metal reaches the region where the solidification begins, to allow the continuous casting of small sections.
  • the homogeneity of the flow of liquid metal in the region where the solidification begins also helps to avoid surface defects of the product to be poured.
  • the method according to the invention therefore allows the manufacture of metal profiles of better quality and above all allows the manufacture of small metal profiles by a continuous casting process of blanks which hitherto was not possible.
  • the funnel-shaped riser has an outlet cross section that corresponds to the cross section of the profile to be cast. Such an extension makes it possible to shape the flow of metal upstream of the ingot mold body where the solidification of the metal begins.
  • the sections to be cast may for example be H, I, L or T profiles and may have a minimum cross-sectional dimension of less than 50 mm.
  • An example of a small profile is a profile having dimensions of 110x70x12 mm, which corresponds to a linear weight of about 25 kg / m.
  • the baffle is formed by a riser base pierced by a plurality of holes.
  • the flow of liquid metal leaving the feed nozzle is braked by the riser bottom and passes through the bottom of the riser through the holes.
  • the riser bottom makes it possible to receive and brake the liquid metal inlet and to prevent its direct flow in the ingot mold body.
  • the plurality of holes allows the liquid metal to flow through the riser bottom to the mold body. These holes are arranged so as to ensure a homogeneous flow downstream of the raising base. Equi-distribution of the liquid metal flow velocity downstream of the riser bottom helps to avoid surface defects in the cast product.
  • the flow of metal in the mold body can be controlled by the number of holes, their arrangement and their size.
  • the diameter of a hole substantially corresponds to the minimum cross-sectional dimension of the channel to be cast and the holes are spaced from each other by about 5 mm edge-to-edge.
  • the baffle is formed by a bottom of raising and a helical channel formed in the bottom of raiser.
  • the liquid metal exiting the supply nozzle is braked by the riser bottom and passes through the helical channel.
  • the riser bottom makes it possible to receive and brake the liquid metal inlet and to prevent its direct flow in the ingot mold body.
  • the helical channel preferably peripheral, allows the liquid metal to flow through the riser bottom to the mold body.
  • the metal flow downstream of the riser bottom can be controlled by the helical channel arrangement and its size.
  • the passage section of the helical channel is between 1 and 4 times the passage section of the supply nozzle.
  • the riser comprises a main tray and an auxiliary receiving tray receiving the feed nozzle and being arranged laterally to the main tray.
  • the baffle is formed by a passage threshold disposed between the main tray and the receiving tray so as to allow the flow of liquid metal from the receiving tray to the main tray communicating with the mold.
  • the liquid metal coming out of the nozzle feed is poured into the receiving tray, and flows from the receiving tray to the main tray overflow over the threshold.
  • the receiving tray thus makes it possible to receive the metal jet of the feed nozzle and to prevent its direct flow in the ingot mold body.
  • the liquid metal in the main tank thus has a calm flow with respect to the flow in the receiving tank, thanks to the barrier effect provided by the passage threshold.
  • the liquid metal can meet an auxiliary baffle before reaching the inlet of the mold body.
  • auxiliary baffle may for example be arranged between the passage threshold and the inlet of the mold body and may further calm the flow of metal in the mold body.
  • the auxiliary baffle may take the form of one of the baffles described above.
  • the riser advantageously comprises a refractory body preferably having a low thermal conductivity and a compact refractory seal providing the sealed mechanical connection between the riser and the mold body placed underneath.
  • the compact refractory seal has good mechanical strength and is preferably a SiAlON seal.
  • Such a refractory seal supports the friction against the skin of metal, especially steel, during the oscillation of the mold and is very useful to ensure somehow the transition between a highly insulating refractory which is constituted by the riser and the cooled copper of the mold against which the solidification of the cast metal takes place.
  • a gas under pressure is advantageously injected into the mold between the riser and the mold body.
  • This gas preferably argon, can be injected through a slot of for example 0.15 mm.
  • the injection of gas through a slot, homogeneous on the perimeter of the mold, makes it possible to avoid parasitic premature starts of the solidification on the compact refractory joint by forming a real mechanical screen between the riser and the mold body.
  • the flow velocity of the metal at the outlet of the feed nozzle can be located between 50 and 180 m / min, while the flow rate of the metal at the inlet of the mold body between 5 and 10 m / min.
  • the liquid metal for example liquid steel
  • a mold 10 comprising an ingot mold body 12 supporting a refractory riser 14.
  • the mold body 12 comprises a passage 16 for the metal, the passage 16 defining a section similar to the section of the product to be cast.
  • the mold body 12 further comprises, near the passage 16, cooling means (not shown) for cooling the steel in the passage 16.
  • the refractory riser 14 comprises a refractory body 18 having a low thermal conductivity and a Compact refractory seal 20, preferably a SiAlON seal, having good mechanical strength.
  • the liquid steel is discharged from a distributor (or "tundish", not shown) into the refractory riser 14 through a feed nozzle 22.
  • the flow of the molten steel through the nozzle 22 is generally regulated by a shutter (not shown) which adjusts the opening between the distributor and the nozzle 22.
  • the flow of liquid steel may have a speed in the range of 50 to 180 m / min.
  • the liquid steel leaving the supply nozzle 22 is received in the refractory riser 14.
  • the level of liquid steel in the riser 14 is greater than the outlet opening of the supply nozzle 22.
  • the nozzle supply 22 is therefore immersed in the liquid steel 24 contained in the riser 14.
  • the riser 14 comprises a baffle element 26 between the outlet of the feed nozzle 22 and the inlet of the ingot mold body 12.
  • This baffle 26 forms an obstacle to the flow of liquid steel from the nozzle 22 and thus calms the flow of steel entering the mold body 12.
  • the flow of liquid steel at the inlet of the mold body can have a speed in the range of from 5 to 10 m / min.
  • the baffle 26 is disposed near the outlet opening of the riser 14 and is formed by a riser base 28 provided with a plurality of holes 30 drilled. Thanks to the riser bottom 28, the impact energy of the jet of liquid acid from the nozzle 22 is broken.
  • the holes 30 drilled in the riser bottom 28 are arranged and dimensioned so as to allow the liquid steel to pass through the bottom of the riser 28 and to be distributed throughout the entire section of the mold body 12.
  • the holes 30 are disposed of so as to produce a homogeneous dispersion of the molten steel in the mold body 12.
  • the diameter of the holes is for example about 12 mm. These holes are spaced 5 mm apart.
  • Fig.1 also shows the funnel shape of the riser 14.
  • the upper portion of the riser has a cross-section tapering toward the riser outlet.
  • the lower part of the riser has a cross section corresponding to the inlet section of the passage 16 of the mold body 12. The shaping of the steel flow is therefore performed upstream of the inlet in the passage 16 of the ingot mold body 12, avoiding thus turbulence at the entrance to the passage 16.
  • FIG. 10 An ingot mold 10 according to a second embodiment is shown in FIG.
  • the baffle 26 is disposed near the outlet opening of the riser 14 and is made by a riser base 32 provided with a peripheral helical channel 34 in the bottom of the riser 32.
  • the riser 32 includes an inlet section 36 facing the riser 14, configured to carry the liquid steel of the riser 18 to an inlet 38 of the helical channel 34.
  • the riser base 32 also includes a turned outlet section 40 to the mold body 12, configured to carry the liquid steel of an outlet 42 of the helical channel 34 to the passage 16 of the mold body 12.
  • a cut through the bottom raises 32 along the line AA of the Fig.2 is shown in Fig.3.
  • the peripheral helical channel 34 allows the liquid steel to pass through the riser bottom 32 and to be distributed in the passage 16 of the mold body 12.
  • the helical channel 34 is arranged and dimensioned so as to produce a homogeneous dispersion of the liquid steel in the mold body 12.
  • the passage section of the helical channel 34 may be 1-4 times the passage section of the supply nozzle 22.
  • the steel must travel in a helical path to reach the solidification start zone. It follows a tangential circulation that is favorable to solidification homogeneity having the same function as an electromagnetic stirring.
  • the baffle 26 is formed by a passage threshold 44 disposed between a main tray 46 of the riser 14 and a receiving tray 48 of the riser 14.
  • the receiving tray 48 is arranged laterally to the main tank 46 and receives the incident liquid steel jet from the immersed feed nozzle 22.
  • the bottom 50 of the reception 48 breaks the energy of the incident jet.
  • the liquid steel passes above the threshold of passage 44 of the receiving tray 48 to the main tray 46, where it directly feeds the passage 16 into the mold body 12.
  • the level of the liquid steel 24 in the riser 14 is maintained at a level above the threshold of passage 44 so as to allow the passage of the liquid steel from the receiving tray 48 to the main tray 46.
  • the flow liquid steel entering the main tray 46 of the riser 14 is quiet.
  • the turbulence in the liquid steel flow in the main tray 46 is minimized.
  • the main tray 46 of the riser 14 has a funnel-shaped thinner towards the extension output.
  • the riser outlet has a cross section corresponding to the inlet section of the passage 16 of the mold body 12. The shaping of the steel flow is therefore carried out upstream of the inlet in the passage 16 of the mold body 12, thus avoiding turbulence at the entrance to the passage 16.
  • auxiliary baffle 52 may be arranged between the baffle 26 and the inlet of the mold body 12, thus further calming the flow of the steel entering the passage 16 of the mold body 12.
  • auxiliary baffle 52 is schematically represented in dashed lines in FIG. 4 and may for example take the form of one of the baffles 26 described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The procedure uses a continuous feed of molten metal, especially steel, into a mould that supports a funnel-shaped refractory riser (14). The molten metal is delivered to the funnel through an immersed nozzle (22) above a chicane (26) designed to dissipate the basic kinetic energy of the jet from the nozzle, while the cross-section of the funnel's outlet end corresponds to the shape of the metal profile being produced, e.g. H,I, L or T, with its greatest dimension not exceeding 50 mm. The chicane can be formed by a series of pierced holes (30) or a spiral channel in the funnel base (28), reducing the speed of the molten metal flow from an initial 50 - 80 m/min to 5 - 10 m/min.

Description

Domaine techniqueTechnical area

La présente invention concerne un procédé pour la coulée continue d'ébauches de profilés en métal, en particulier de profilés en acier, notamment de profilés en H, présentant une section transversale de petite dimension.The present invention relates to a method for the continuous casting of blanks of metal profiles, in particular steel sections, in particular H-sections, having a small cross-section.

Etat de la techniqueState of the art

L'opération de coulée continue consiste en général à verser un métal en fusion dans une lingotière sans fond essentiellement constituée d'un corps de lingotière métallique, habituellement un élément tubulaire, en cuivre ou alliage de cuivre, définissant un passage pour le métal coulé et dont les parois sont énergiquement refroidies par circulation d'eau ; et à extraire en continu de cette lingotière un produit déjà solidifié extérieurement sur plusieurs millimètres d'épaisseur. La solidification progresse ensuite vers l'axe du produit et s'achève au cours de la descente de celui-ci en aval de la lingotière dans la zone dite de "refroidissement secondaire" sous l'effet de rampes d'arrosage d'eau. Le produit obtenu est ensuite découpé à longueur, puis laminé avant expédition à la clientèle ou transformation sur place en barres, fils, profilés, plaques, tôles, etc.The continuous casting operation generally involves pouring a molten metal into a bottomless mold essentially consisting of a metal mold body, usually a tubular member, made of copper or copper alloy, defining a passage for the cast metal and whose walls are vigorously cooled by circulation of water; and to extract continuously from this mold a product already solidified externally over several millimeters thick. The solidification then progresses towards the axis of the product and is completed during the descent thereof downstream of the mold in the so-called "secondary cooling" zone under the effect of watering ramps. The resulting product is then cut to length and then rolled before shipment to customers or processed on site in bars, wires, profiles, plates, sheets, etc.

Dans la technique dite de coulée continue en charge, une rehausse rigide en matériau réfractaire est placée sur le dessus du corps tubulaire de lingotière pour prolonger vers le haut le passage intérieur du corps tubulaire métallique dans lequel est coulé le métal en fusion. Au cours de la coulée, le niveau de la surface libre du métal en fusion (encore appelée ménisque) est maintenu dans la rehausse, généralement à une distance de 10 à 15 cm au-dessus du corps tubulaire où débute la solidification. Cela permet donc de remonter le ménisque en amont de la zone de solidification, et d'éviter ainsi l'apparition de défauts de surface ou sous cutanés liés à la variation du niveau du ménisque dans la partie haute du corps de lingotière. En outre, le volume de métal en fusion dans la rehausse joue un rôle de tampon, amortissant les turbulences d'écoulement qui se développent inévitablement sous l'effet de l'arrivée de métal. L'emploi de la rehausse permet donc d'obtenir un écoulement relativement calme au niveau où s'amorce la solidification en lingotière, ce qui contribue à une meilleure qualité du produit solidifié et notamment à la régularité de sa surface et/ou à une productivité accrue de l'installation de coulée grâce à une vitesse de coulée permise plus élevée.In the technique of continuous casting under load, a rigid riser of refractory material is placed on the top of the tubular mold body to extend upward the inner passage of the metal tubular body in which the molten metal is cast. During casting, the level of the free surface of the molten metal (also called meniscus) is maintained in the riser, generally at a distance of 10 to 15 cm above the tubular body where solidification begins. This makes it possible to raise the meniscus upstream of the solidification zone, and thus to avoid the appearance of surface or subcutaneous defects related to the variation of the meniscus level in the upper part of the mold body. In addition, the volume of molten metal in the riser acts as a buffer, damping the flow turbulence that inevitably develops under the effect of the arrival of metal. The use of the riser thus makes it possible to obtain a relatively calm flow at the point where mold solidification begins, which contributes to a better quality of the solidified product and in particular to the regularity of its surface and / or to a productivity increased casting facility due to higher permitted casting speed.

Afin de réduire le nombre d'opérations de laminage nécessaires à l'obtention du produit final, la coulée en continu d'ébauches ayant une section transversale proche de celle du produit à fabriquer (near-net-shape casting) a déjà été proposée et réalisée. Ainsi, par exemple, des ébauches de profilés ressemblant au profilé à fabriquer sont de nos jours coulées en continu. De telles ébauches sont ensuite soumises au laminage afin d'arriver au produit final avec un nombre très inférieur d'opérations de laminage, ce qui réduit sensiblement les coûts de production. La taille minimale d'ébauches ainsi coulées est d'environ 300x700x50 mm, ce qui correspond à un poids d'environ 500 kg/m.In order to reduce the number of rolling operations required to obtain the final product, the continuous casting of blanks having a cross-section close to that of the product to be manufactured (near-net-shape casting) has already been proposed and performed. Thus, for example, profiles blanks resembling the profile to be manufactured are now cast continuously. Such blanks are then subjected to rolling to arrive at the final product with a much lower number of rolling operations, which substantially reduces production costs. The minimum size of blanks thus cast is about 300x700x50 mm, which corresponds to a weight of about 500 kg / m.

A ce jour, il n'a cependant pas encore été possible d'obtenir, par un procédé de coulée continue de type "near-net-shape casting", des ébauches de profilés en métal de petite taille en section, ayant par exemple une taille d'environ 110x70x12 mm, ce qui correspond à un poids linéique d'environ 25 kg/m.To date, however, it has not yet been possible to obtain, by a continuous casting process of the "near-net-shape casting" type, blanks of metal profiles of small sectional size, having, for example, a size about 110x70x12 mm, which corresponds to a linear weight of about 25 kg / m.

Il en va en effet tout autrement dans le cas d'ébauches de petits profilés pour lesquelles l'espace de coulée dans sa plus grande dimension, à savoir au point triple à l'endroit du congé à l'intersection entre âme et ailes, présente un diamètre d'à peine 20 mm, 30 mm au maximum. Cette exiguïté est incompatible avec l'introduction d'une busette de coulée aussi fine soit-elle. De surcroît, même si on y parvenait, les turbulences accompagnant la libération d'un jet de métal en fusion à un endroit aussi confiné de l'espace de coulée entre les parois refroidies de la lingotière seraient telles que toute tentative de solidification homogène et régulière du métal coulé serait certainement vouée à l'échec.It is indeed quite different in the case of blanks of small profiles for which the casting space in its largest dimension, namely at the triple point at the location of the leave at the intersection between soul and wings, presents a diameter of just 20 mm, maximum 30 mm. This smallness is incompatible with the introduction of a casting nozzle as fine as it is. Moreover, even if it were successful, the turbulence accompanying the release of a jet of molten metal in such a confined area of the casting space between the cooled walls of the mold would be such that any attempt to solidify homogeneous and regular cast metal would certainly be doomed.

Par souci de clarté, on précise que l'on quantifiera ces ébauches de petits profilés d'ébauches à section transversale (généralement de forme de H, I, L ou T) dont la dimension la plus grande - ici le point triple à l'intersection âme-aile - ne dépasse guère 30 mm et en tout cas jamais au-delà de 50 mm, c'est-à-dire d'ébauches dont l'espace de coulée défini par la lingotière qui les coulent en continu est de taille trop réduite pour recevoir une busette immergée, ce dans l'état actuel des connaissances.For the sake of clarity, it is specified that these blanks of small cross-section blanks (generally of H, I, L or T shape) of the largest dimension - here the triple point at soul-wing intersection - hardly exceeds 30 mm and in any case never more than 50 mm, that is to say blanks whose casting space defined by the ingot mold which flows continuously is of size too small to receive a submerged nozzle, in the current state of knowledge.

Objet de l'inventionObject of the invention

L'objet de la présente invention est de proposer un procédé amélioré pour la coulée continue d'ébauches de profilés en métal, notamment d'ébauches de petits profilés en acier, conformément à la définition que lui donne la revendication 1 ci-après.The object of the present invention is to provide an improved method for the continuous casting of blanks of metal profiles, including blanks of small steel profiles, according to the definition given in claim 1 below.

Description générale de l'inventionGeneral description of the invention

La présente invention concerne donc un procédé pour la coulée continue d'ébauches de profilés en métal, en particulier d'ébauches de petits profilés en acier, selon la technique de la coulée continue en charge dans une lingotière de coulée continue comprenant un corps de lingotière supportant une rehausse réfractaire en forme d'entonnoir. Le métal liquide est versé dans la rehausse en amont d'une chicane, le métal liquide étant versé à travers une busette d'alimentation immergée dans le métal liquide contenu dans la rehausse et la chicane étant avantageusement conçue pour dissiper l'essentiel de l'énergie cinétique du jet de métal sortant de la busette d'alimentation.The present invention therefore relates to a process for the continuous casting of blanks of metal profiles, in particular blanks of small steel sections, according to the technique of continuous casting under load in a continuous casting mold comprising a mold body supporting a refractory funnel-shaped extension. The liquid metal is poured into the riser upstream of a baffle, the liquid metal being poured through a feed nozzle immersed in the liquid metal contained in the riser and the baffle being advantageously designed to dissipate most of the liquid. kinetic energy of the metal jet leaving the supply nozzle.

Un mérite de la présente invention est d'avoir réalisé que la coulée continue "near-net-shape" d'ébauches de petits profilés peut être effectuée en appliquant la coulée continue dite "en charge verticale" et que l'écoulement calme du métal en fusion au niveau où s'amorce sa solidification est particulièrement important en ce qui concerne la coulée continue de petits profilés.One merit of the present invention is to have realized that the continuous casting "near-net-shape" of blanks of small profiles can be carried out by applying the continuous casting known as "in vertical load" and that the calm flow of the metal melting at the level where its solidification begins is particularly important with regard to the continuous casting of small sections.

Suivant le procédé de la présente invention, le métal liquide est versé depuis un répartiteur (ou "tundish") dans la rehausse réfractaire de la lingotière à l'aide d'une busette d'alimentation. Le niveau de métal liquide dans la rehausse atteint une hauteur telle que la busette d'alimentation soit immergée dans le métal liquide dans la rehausse. Grâce à la rehausse associée à la chicane, la surface libre du métal en fusion peut être maintenue à une certaine distance du corps de lingotière où débute la solidification, En outre, l'écoulement de métal au niveau où débute la solidification est laminaire ou quasi laminaire, en tout cas très peu agité, après être passé par la chicane dont le rôle, en déviant brusquement la trajectoire du courant de métal issu de la busette, est d'atténuer les turbulences. Par sa forme en entonnoir, la rehausse permet de diriger l'écoulement du métal liquide progressivement vers le corps de lingotière.According to the process of the present invention, the liquid metal is poured from a distributor (or "tundish") in the refractory riser of the mold using a nozzle. The level of liquid metal in the riser reaches a height such that the feed nozzle is immersed in the liquid metal in the riser. Thanks to the riser associated with the baffle, the free surface of the molten metal can be maintained at a distance from the ingot mold body where the solidification begins. In addition, the flow of metal at the level where the solidification begins is laminar or quasi laminar, in any case very little agitated, after passing through the baffle whose role, by deviating abruptly the trajectory of the metal stream from the nozzle, is to mitigate the turbulence. By its funnel shape, the riser makes it possible to direct the flow of the liquid metal progressively towards the ingot mold body.

Cette chicane, agencée entre la sortie de la busette d'alimentation et l'entrée du corps de lingotière, permet de dissiper l'énergie cinétique du jet de métal sortant de la busette d'alimentation, avant que l'écoulement de métal n'atteigne la région où débute la solidification, pour permettre ainsi la coulée continue de petits profilés. L'homogénéité de l'écoulement de métal liquide dans la région où débute la solidification participe également à éviter les défauts de surface du produit à couler.This baffle, arranged between the outlet of the feed nozzle and the inlet of the mold body, makes it possible to dissipate the kinetic energy of the metal jet coming out of the feed nozzle, before the flow of metal reaches the region where the solidification begins, to allow the continuous casting of small sections. The homogeneity of the flow of liquid metal in the region where the solidification begins also helps to avoid surface defects of the product to be poured.

Le procédé selon l'invention permet par conséquent la fabrication de profilés en métal de meilleure qualité et permet surtout la fabrication de petits profilés en métal par un procédé de coulée continue d'ébauches qui jusqu'ici n'était pas envisageable.The method according to the invention therefore allows the manufacture of metal profiles of better quality and above all allows the manufacture of small metal profiles by a continuous casting process of blanks which hitherto was not possible.

Avantageusement, la rehausse en forme d'entonnoir a une section transversale de sortie qui correspond à la section transversale du profilé à couler. Une telle rehausse permet de mettre en forme l'écoulement de métal en amont du corps de lingotière où débute la solidification du métal.Advantageously, the funnel-shaped riser has an outlet cross section that corresponds to the cross section of the profile to be cast. Such an extension makes it possible to shape the flow of metal upstream of the ingot mold body where the solidification of the metal begins.

Les profilés à couler peuvent par exemple être des profilés en H, I, L ou T et peuvent avoir une dimension minimale en section transversale inférieure à 50 mm. Un exemple d'un petit profilé est un profilé ayant des dimensions de 110x70x12 mm, ce qui correspond à un poids linéique d'environ 25 kg/m.The sections to be cast may for example be H, I, L or T profiles and may have a minimum cross-sectional dimension of less than 50 mm. An example of a small profile is a profile having dimensions of 110x70x12 mm, which corresponds to a linear weight of about 25 kg / m.

Selon un premier mode de réalisation préféré, la chicane est formée par un fond de rehausse percé par une pluralité de trous. Le flux de métal liquide sortant de la busette d'alimentation est freiné par le fond de rehausse et traverse le fond de rehausse à travers les trous. Le fond de rehausse permet de recevoir et freiner l'arrivée de métal liquide et d'éviter son écoulement direct dans le corps de lingotière. La pluralité de trous permet au métal liquide de couler à travers le fond de rehausse vers le corps de lingotière. Ces trous sont agencés de sorte à assurer un écoulement homogène en aval du fond de rehausse. Une equi-répartition de la vitesse d'écoulement de métal liquide en aval du fond de rehausse aide à éviter les défauts de surface dans le produit coulé. L'écoulement de métal dans le corps de lingotière peut être contrôlé par le nombre de trous, leur agencement et leur taille. De préférence, le diamètre d'un trou correspond sensiblement à la dimension minimale en section transversale du profilé à couler et les trous sont éloignés les uns des autres d'environ 5 mm bord à bord.According to a first preferred embodiment, the baffle is formed by a riser base pierced by a plurality of holes. The flow of liquid metal leaving the feed nozzle is braked by the riser bottom and passes through the bottom of the riser through the holes. The riser bottom makes it possible to receive and brake the liquid metal inlet and to prevent its direct flow in the ingot mold body. The plurality of holes allows the liquid metal to flow through the riser bottom to the mold body. These holes are arranged so as to ensure a homogeneous flow downstream of the raising base. Equi-distribution of the liquid metal flow velocity downstream of the riser bottom helps to avoid surface defects in the cast product. The flow of metal in the mold body can be controlled by the number of holes, their arrangement and their size. Preferably, the diameter of a hole substantially corresponds to the minimum cross-sectional dimension of the channel to be cast and the holes are spaced from each other by about 5 mm edge-to-edge.

Selon un deuxième mode de réalisation préféré, la chicane est formée par un fond de rehausse et un canal hélicoïdal ménagé dans le fond de rehausse. Le métal liquide sortant de la busette d'alimentation est freiné par le fond de rehausse et traverse ce dernier à travers le canal hélicoïdal. Le fond de rehausse permet de recevoir et freiner l'arrivée de métal liquide et d'éviter son écoulement direct dans le corps de lingotière. Le canal hélicoïdal, de préférence périphérique, permet au métal liquide de couler à travers le fond de rehausse vers le corps de lingotière. L'écoulement de métal en aval du fond de rehausse peut être contrôlé par l'agencement du canal hélicoïdal et sa dimension. De préférence, la section de passage du canal hélicoïdal est entre 1 et 4 fois la section de passage de la busette d'alimentation.According to a second preferred embodiment, the baffle is formed by a bottom of raising and a helical channel formed in the bottom of raiser. The liquid metal exiting the supply nozzle is braked by the riser bottom and passes through the helical channel. The riser bottom makes it possible to receive and brake the liquid metal inlet and to prevent its direct flow in the ingot mold body. The helical channel, preferably peripheral, allows the liquid metal to flow through the riser bottom to the mold body. The metal flow downstream of the riser bottom can be controlled by the helical channel arrangement and its size. Preferably, the passage section of the helical channel is between 1 and 4 times the passage section of the supply nozzle.

Selon un troisième mode de réalisation préféré, la rehausse comprend un bac principal et un bac de réception annexe recevant la busette d'alimentation et étant agencé latéralement au bac principal. La chicane est formée par un seuil de passage disposé entre le bac principal et le bac de réception de sorte à permettre l'écoulement de métal liquide du bac de réception vers le bac principal communiquant avec la lingotière. Le métal liquide sortant de la busette d'alimentation est versé dans le bac de réception, et coule du bac de réception vers le bac principal en passant par débordement par dessus le seuil de passage. Le bac de réception permet donc de recevoir le jet de métal de la busette d'alimentation et d'éviter son écoulement direct dans le corps de lingotière. Le métal liquide dans le bac principal présente ainsi un écoulement calme par rapport à l'écoulement dans le bac de réception, grâce à l'effet de barrage procuré par le seuil de passage.According to a third preferred embodiment, the riser comprises a main tray and an auxiliary receiving tray receiving the feed nozzle and being arranged laterally to the main tray. The baffle is formed by a passage threshold disposed between the main tray and the receiving tray so as to allow the flow of liquid metal from the receiving tray to the main tray communicating with the mold. The liquid metal coming out of the nozzle feed is poured into the receiving tray, and flows from the receiving tray to the main tray overflow over the threshold. The receiving tray thus makes it possible to receive the metal jet of the feed nozzle and to prevent its direct flow in the ingot mold body. The liquid metal in the main tank thus has a calm flow with respect to the flow in the receiving tank, thanks to the barrier effect provided by the passage threshold.

En outre, le métal liquide peut rencontrer une chicane auxiliaire avant d'arriver à l'entrée du corps de lingotière. Une telle chicane auxiliaire peut par exemple être agencée entre le seuil de passage et l'entrée du corps de lingotière et peut davantage calmer l'écoulement de métal dans le corps de lingotière. La chicane auxiliaire peut prendre la forme d'une des chicanes décrites ci-dessus.In addition, the liquid metal can meet an auxiliary baffle before reaching the inlet of the mold body. Such auxiliary baffle may for example be arranged between the passage threshold and the inlet of the mold body and may further calm the flow of metal in the mold body. The auxiliary baffle may take the form of one of the baffles described above.

La rehausse comprend avantageusement un corps réfractaire ayant de préférence une faible conductivité thermique et un joint réfractaire compact assurant la liaison mécanique étanche entre la rehausse et le corps de lingotière placée en dessous. Le joint réfractaire compact présente une bonne tenue mécanique et est de préférence un joint SiAlON. Un tel joint réfractaire supporte le frottement contre la peau de métal, notamment d'acier, lors de l'oscillation de la lingotière et s'avère très utile pour assurer en quelque sorte la transition entre un réfractaire très isolant dont est constitué la rehausse et le cuivre refroidi de la lingotière contre lequel s'opère la solidification du métal coulé.The riser advantageously comprises a refractory body preferably having a low thermal conductivity and a compact refractory seal providing the sealed mechanical connection between the riser and the mold body placed underneath. The compact refractory seal has good mechanical strength and is preferably a SiAlON seal. Such a refractory seal supports the friction against the skin of metal, especially steel, during the oscillation of the mold and is very useful to ensure somehow the transition between a highly insulating refractory which is constituted by the riser and the cooled copper of the mold against which the solidification of the cast metal takes place.

Un gaz sous pression est avantageusement injecté dans la lingotière entre la rehausse et le corps de lingotière. Ce gaz, de préférence de l'argon, peut être injecté à travers une fente de par exemple 0,15 mm. L'injection de gaz par une fente, homogène sur le périmètre du moule, permet d'éviter des démarrages prématurés parasites de la solidification sur le joint réfractaire compact en formant un véritable écran mécanique entre la rehausse et le corps de lingotière.A gas under pressure is advantageously injected into the mold between the riser and the mold body. This gas, preferably argon, can be injected through a slot of for example 0.15 mm. The injection of gas through a slot, homogeneous on the perimeter of the mold, makes it possible to avoid parasitic premature starts of the solidification on the compact refractory joint by forming a real mechanical screen between the riser and the mold body.

La vitesse d'écoulement du métal à la sortie de la busette d'alimentation peut être située entre 50 et 180 m/min, tandis que la vitesse d'écoulement du métal à l'entrée du corps de lingotière entre 5 et 10 m/min.The flow velocity of the metal at the outlet of the feed nozzle can be located between 50 and 180 m / min, while the flow rate of the metal at the inlet of the mold body between 5 and 10 m / min.

Description des dessinsDescription of the drawings

D'autres particularités et caractéristiques de l'invention ressortiront de la description détaillée de quelques modes de réalisation avantageux présentés ci-dessous, à titre d'illustration, en se référant aux dessins annexés. Ceux-ci montrent:

  • FIG.1: une vue en coupe schématique d'une lingotière selon un premier mode de réalisation ;
  • FIG.2: une vue en coupe schématique d'une lingotière selon un deuxième mode de réalisation ;
  • FIG.3: une vue en coupe transversale selon la coupe A-A de la FIG.2; et
  • FIG.4: une vue en coupe schématique d'une lingotière selon un troisième mode de réalisation.
Other features and characteristics of the invention will become apparent from the detailed description of some advantageous embodiments presented below, by way of illustration, with reference to the accompanying drawings. These show:
  • FIG. 1: a schematic sectional view of an ingot mold according to a first embodiment;
  • FIG. 2: a schematic sectional view of an ingot mold according to a second embodiment;
  • FIG. 3: a cross-sectional view according to section AA of FIG. and
  • FIG. 4: a schematic sectional view of an ingot mold according to a third embodiment.

Sur les figures, les mêmes signes de référence désignent des éléments identiques ou similaires.In the figures, the same reference signs designate identical or similar elements.

Description détaillée de quelques modes de réalisation préférésDetailed description of some preferred embodiments

Lors de la coulée continue en charge, le métal liquide, par exemple l'acier liquide, est déversé dans une lingotière 10 comprenant un corps de lingotière 12 supportant une rehausse réfractaire 14. Le corps de lingotière 12 comprend un passage 16 pour le métal, le passage 16 définissant une section similaire à la section du produit à couler. Le corps de lingotière 12 comprend en outre, à proximité du passage 16, des moyens de refroidissement (non-représentés) pour refroidir l'acier dans le passage 16. La rehausse réfractaire 14 comprend un corps réfractaire 18 ayant une faible conductivité thermique et un joint réfractaire compact 20, de préférence un joint SiAlON, ayant une bonne tenue mécanique.During continuous casting under load, the liquid metal, for example liquid steel, is poured into a mold 10 comprising an ingot mold body 12 supporting a refractory riser 14. The mold body 12 comprises a passage 16 for the metal, the passage 16 defining a section similar to the section of the product to be cast. The mold body 12 further comprises, near the passage 16, cooling means (not shown) for cooling the steel in the passage 16. The refractory riser 14 comprises a refractory body 18 having a low thermal conductivity and a Compact refractory seal 20, preferably a SiAlON seal, having good mechanical strength.

L'acier liquide est déversé à partir d'un répartiteur (ou "tundish", non-représenté) dans la rehausse réfractaire 14 à travers une busette d'alimentation 22. L'écoulement de l'acier liquide à travers la busette 22 est généralement réglé par un obturateur (non-représenté) qui permet de régler l'ouverture entre le répartiteur et la busette 22.The liquid steel is discharged from a distributor (or "tundish", not shown) into the refractory riser 14 through a feed nozzle 22. The flow of the molten steel through the nozzle 22 is generally regulated by a shutter (not shown) which adjusts the opening between the distributor and the nozzle 22.

A la sortie de la busette d'alimentation 22, l'écoulement d'acier liquide peut avoir une vitesse se situant dans la plage allant de 50 à 180 m/min. L'acier liquide sortant de la busette d'alimentation 22 est reçu dans la rehausse réfractaire 14. Typiquement, le niveau d'acier liquide dans la rehausse 14 est supérieur à l'ouverture de sortie de la busette d'alimentation 22. La busette d'alimentation 22 est par conséquent immergée dans l'acier liquide 24 contenu dans la rehausse 14.At the outlet of the feed nozzle 22, the flow of liquid steel may have a speed in the range of 50 to 180 m / min. The liquid steel leaving the supply nozzle 22 is received in the refractory riser 14. Typically, the level of liquid steel in the riser 14 is greater than the outlet opening of the supply nozzle 22. The nozzle supply 22 is therefore immersed in the liquid steel 24 contained in the riser 14.

Selon un aspect important de l'invention, la rehausse 14 comprend un élément 26 formant chicane entre la sortie de la busette d'alimentation 22 et l'entrée du corps de lingotière 12. Cette chicane 26 forme un obstacle à l'écoulement d'acier liquide provenant de la busette 22 et calme ainsi l'écoulement de l'acier entrant dans le corps de lingotière 12. L'écoulement d'acier liquide à l'entrée du corps de lingotière peut avoir une vitesse se situant dans la plage allant de 5 à 10 m/min.According to an important aspect of the invention, the riser 14 comprises a baffle element 26 between the outlet of the feed nozzle 22 and the inlet of the ingot mold body 12. This baffle 26 forms an obstacle to the flow of liquid steel from the nozzle 22 and thus calms the flow of steel entering the mold body 12. The flow of liquid steel at the inlet of the mold body can have a speed in the range of from 5 to 10 m / min.

Selon un premier mode de réalisation, illustré en Fig.1, la chicane 26 est disposée à proximité de l'ouverture de sortie de la rehausse 14 et est réalisée par un fond de rehausse 28 pourvu d'une pluralité de trous 30 percés. Grâce au fond de rehausse 28, l'énergie d'impact du jet d'acide liquide provenant de la busette 22 est cassée. Les trous 30 percés dans le fond de rehausse 28 sont agencés et dimensionnés de façon à permettre à l'acier liquide de traverser le fond de rehausse 28 et de se répartir dans toute la section du corps de lingotière 12. Les trous 30 sont disposés de sorte à produire une dispersion homogène de l'acier liquide dans le corps de lingotière 12. Pour la coulée de profilés de taille 110x70x12 mm, le diamètre des trous est par exemple d'environ 12 mm. Ces trous sont espacés de 5 mm bord à bord.According to a first embodiment, illustrated in Fig.1, the baffle 26 is disposed near the outlet opening of the riser 14 and is formed by a riser base 28 provided with a plurality of holes 30 drilled. Thanks to the riser bottom 28, the impact energy of the jet of liquid acid from the nozzle 22 is broken. The holes 30 drilled in the riser bottom 28 are arranged and dimensioned so as to allow the liquid steel to pass through the bottom of the riser 28 and to be distributed throughout the entire section of the mold body 12. The holes 30 are disposed of so as to produce a homogeneous dispersion of the molten steel in the mold body 12. For the casting of profiles of size 110x70x12 mm, the diameter of the holes is for example about 12 mm. These holes are spaced 5 mm apart.

La Fig.1 montre également la forme d'entonnoir de la rehausse 14. La partie supérieure de la rehausse a une section transversale s'amincissant en direction de la sortie de rehausse. La partie inférieure de la rehausse a une section transversale correspondant à la section d'entrée du passage 16 du corps de lingotière 12. La mise en forme de l'écoulement d'acier est par conséquent réalisée en amont de l'entrée dans le passage 16 du corps de lingotière 12, évitant ainsi des turbulences à l'entrée dans le passage 16.Fig.1 also shows the funnel shape of the riser 14. The upper portion of the riser has a cross-section tapering toward the riser outlet. The lower part of the riser has a cross section corresponding to the inlet section of the passage 16 of the mold body 12. The shaping of the steel flow is therefore performed upstream of the inlet in the passage 16 of the ingot mold body 12, avoiding thus turbulence at the entrance to the passage 16.

Une lingotière 10 selon un deuxième mode de réalisation est montré sur la Fig.2. Selon ce mode de réalisation, la chicane 26 est disposée à proximité de l'ouverture de sortie de la rehausse 14 et est réalisée par un fond de rehausse 32 pourvu d'un canal hélicoïdal périphérique 34 dans le fond de rehausse 32. Le fond de rehausse 32 comprend une section d'entrée 36 tournée vers la rehausse 14, configurée de sorte à mener l'acier liquide de la rehausse 18 vers une entrée 38 du canal hélicoïdal 34. Le fond de rehausse 32 comprend également une section de sortie 40 tournée vers le corps de lingotière 12, configurée de sorte à mener l'acier liquide d'une sortie 42 du canal hélicoïdal 34 vers le passage 16 du corps de lingotière 12. Une coupe à travers le fond de rehausse 32 selon la ligne A-A de la Fig.2 est montrée en Fig.3.An ingot mold 10 according to a second embodiment is shown in FIG. According to this embodiment, the baffle 26 is disposed near the outlet opening of the riser 14 and is made by a riser base 32 provided with a peripheral helical channel 34 in the bottom of the riser 32. The bottom The riser 32 includes an inlet section 36 facing the riser 14, configured to carry the liquid steel of the riser 18 to an inlet 38 of the helical channel 34. The riser base 32 also includes a turned outlet section 40 to the mold body 12, configured to carry the liquid steel of an outlet 42 of the helical channel 34 to the passage 16 of the mold body 12. A cut through the bottom raises 32 along the line AA of the Fig.2 is shown in Fig.3.

Grâce au fond de rehausse 32, l'énergie d'impact du jet d'acide liquide provenant de la busette 22 est cassée. Le canal hélicoïdal périphérique 34 permet à l'acier liquide de traverser le fond de rehausse 32 et de se répartir dans le passage 16 du corps de lingotière 12. Le canal hélicoïdal 34 est disposé et dimensionné de sorte à produire une dispersion homogène de l'acier liquide dans le corps de lingotière 12. La section de passage du canal hélicoïdal 34 peut être de 1-4 fois la section de passage de la busette d'alimentation 22.Thanks to the bottom enhancement 32, the impact energy of the jet of liquid acid from the nozzle 22 is broken. The peripheral helical channel 34 allows the liquid steel to pass through the riser bottom 32 and to be distributed in the passage 16 of the mold body 12. The helical channel 34 is arranged and dimensioned so as to produce a homogeneous dispersion of the liquid steel in the mold body 12. The passage section of the helical channel 34 may be 1-4 times the passage section of the supply nozzle 22.

L'acier doit circuler suivant un trajet hélicoïdal pour parvenir dans la zone de début de solidification. Il s'en suit une circulation tangentielle qui est favorable à l'homogénéité de solidification ayant la même fonction qu'un brassage électromagnétique.The steel must travel in a helical path to reach the solidification start zone. It follows a tangential circulation that is favorable to solidification homogeneity having the same function as an electromagnetic stirring.

Selon un troisième mode de réalisation, illustré en Fig.4, la chicane 26 est formée par un seuil de passage 44 disposé entre un bac principal 46 de la rehausse 14 et un bac de réception 48 de la rehausse 14. Le bac de réception 48 est agencé latéralement au bac principal 46 et reçoit le jet d'acier liquide incident de la busette d'alimentation 22 immergée. Le fond 50 du bac de réception 48 casse l'énergie du jet incident. L'acier liquide passe au dessus du seuil de passage 44 du bac de réception 48 vers le bac principal 46, d'où il alimente directement le passage 16 dans le corps de lingotière 12. Le niveau de l'acier liquide 24 dans la rehausse 14 est maintenu à un niveau supérieur au seuil de passage 44 de sorte à permettre le passage de l'acier liquide du bac de réception 48 vers le bac principal 46. Grâce au bac de réception 48 et au seuil de passage 44, l'écoulement d'acier liquide entrant dans le bac principal 46 de la rehausse 14 est calme. Les turbulences dans l'écoulement d'acier liquide dans le bac principal 46 sont minimisées. En outre, le bac principal 46 de la rehausse 14 a une forme d'entonnoir s'amincissant en direction de la sortie de rehausse. La sortie de rehausse a une section transversale correspondant à la section d'entrée du passage 16 du corps de lingotière 12. La mise en forme de l'écoulement d'acier est par conséquent réalisée en amont de l'entrée dans le passage 16 du corps de lingotière 12, évitant ainsi des turbulences au niveau de l'entrée dans le passage 16.According to a third embodiment, illustrated in FIG. 4, the baffle 26 is formed by a passage threshold 44 disposed between a main tray 46 of the riser 14 and a receiving tray 48 of the riser 14. The receiving tray 48 is arranged laterally to the main tank 46 and receives the incident liquid steel jet from the immersed feed nozzle 22. The bottom 50 of the reception 48 breaks the energy of the incident jet. The liquid steel passes above the threshold of passage 44 of the receiving tray 48 to the main tray 46, where it directly feeds the passage 16 into the mold body 12. The level of the liquid steel 24 in the riser 14 is maintained at a level above the threshold of passage 44 so as to allow the passage of the liquid steel from the receiving tray 48 to the main tray 46. With the receiving tray 48 and the passage threshold 44, the flow liquid steel entering the main tray 46 of the riser 14 is quiet. The turbulence in the liquid steel flow in the main tray 46 is minimized. In addition, the main tray 46 of the riser 14 has a funnel-shaped thinner towards the extension output. The riser outlet has a cross section corresponding to the inlet section of the passage 16 of the mold body 12. The shaping of the steel flow is therefore carried out upstream of the inlet in the passage 16 of the mold body 12, thus avoiding turbulence at the entrance to the passage 16.

Une chicane auxiliaire 52 peut être agencée entre la chicane 26 et l'entrée du corps de lingotière 12, calmant ainsi d'avantage l'écoulement de l'acier entrant dans le passage 16 du corps de lingotière 12. Une telle chicane auxiliaire 52 est représentée de manière schématique en pointillés sur la Fig.4 et peut par exemple prendre la forme d'une des chicanes 26 décrites ci-dessus.An auxiliary baffle 52 may be arranged between the baffle 26 and the inlet of the mold body 12, thus further calming the flow of the steel entering the passage 16 of the mold body 12. Such auxiliary baffle 52 is schematically represented in dashed lines in FIG. 4 and may for example take the form of one of the baffles 26 described above.

Il va de soi que l'invention peut présenter de nombreuses autres variantes de réalisation dans la mesure où la définition qu'en donne aux revendications jointes sont respectées. Ainsi, le terme "chicane" utilisé précédemment et qui, en association avec la rehausse réfractaire, constituent à eux deux les éléments caractéristiques essentiels de l'invention, doit être compris de manière générique comme décrivant tout moyen constituant un obstacle déviant la trajectoire d'un courant fluide placé sur le parcours du flux de métal frais entre la sortie de la busette de coulée et l'entrée dans l'espace de coulée en lingotière et ayant pour effet premier la séparation hydrodynamique d'un volume en deux volumes contigus amont et aval dans le sens de l'écoulement du métal en fusion à couler.It goes without saying that the invention may have many other alternative embodiments to the extent that the definition given in the appended claims are respected. Thus, the term "baffle" used previously and which, in combination with the refractory riser, together constitute the essential characteristic elements of the invention, must be understood generically as describing any means constituting an obstacle deviating from the trajectory of the invention. a fluid stream placed on the path of the fresh metal stream between the outlet of the casting nozzle and the entry into the casting space in the mold and having as a first effect the hydrodynamic separation of a volume in two contiguous volumes upstream and downstream in the flow direction of the molten metal to be cast.

Claims (13)

Procédé pour la coulée continue d'ébauches de profilés en métal, en particulier d'ébauches de profilés en acier,
caractérisé en ce que
ladite coulée continue se fait, selon la technique de la coulée continue en charge, dans une lingotière de coulée continue (10) comprenant un corps de lingotière (12) supportant une rehausse réfractaire (14) en forme d'entonnoir,
le métal en fusion à couler est versé dans ladite rehausse (14) à travers une busette d'alimentation (22) immergée en amont d'une chicane (26).Process for the continuous casting of blanks of metal profiles, in particular blanks of steel profiles,
characterized in that
said continuous casting is carried out, according to the technique of continuous casting under load, in a continuous casting mold (10) comprising an ingot mold body (12) supporting a funnel-shaped refractory riser (14),
the molten metal to be poured is poured into said riser (14) through a feed nozzle (22) immersed upstream of a baffle (26). Procédé selon la revendication 1, dans lequel ladite chicane (26) est conçue pour dissiper l'essentiel de l'énergie cinétique du jet de métal sortant de la dite busette d'alimentation (22).The method of claim 1, wherein said baffle (26) is designed to dissipate most of the kinetic energy of the metal jet exiting said power nozzle (22). Procédé selon la revendication 1 ou 2, dans lequel ladite rehausse (14) en forme d'entonnoir a une section transversale de sortie qui correspond à la section transversale de ladite ébauche de profilé à couler.The method of claim 1 or 2, wherein said funnel-shaped riser (14) has an exit cross-section corresponding to the cross-section of said casting profile blank. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdites ébauches ont une forme en H, I, L ou T.A method as claimed in any one of the preceding claims, wherein said blanks are H, I, L or T shaped. Procédé selon l'une quelconque des revendications précédentes, dans lequel lesdites ébauches de petits profilés ont leur plus grande dimension en section transversale inférieure à 50 mm.A method as claimed in any one of the preceding claims, wherein said blanks of small sections have their largest dimension in cross-section less than 50 mm. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel : ladite chicane (26) est formée par un fond de rehausse (28) et une pluralité de trous (30) percés dans ledit fond de rehausse (28). The method of any one of claims 1 to 5, wherein: said baffle (26) is formed by a riser base (28) and a plurality of holes (30) drilled in said riser base (28). Procédé selon l'une quelconque des revendications 1 à 5, dans lequel : ladite chicane (26) est formée par un fond de rehausse (32) et un canal hélicoïdal (34) dans ledit fond de rehausse (32). The method of any one of claims 1 to 5, wherein: said baffle (26) is formed by a riser base (32) and a helical channel (34) in said riser base (32). Procédé selon l'une quelconque des revendications 1 à 5, dans lequel : ladite rehausse (14) comprend un bac principal (46) et un bac de réception annexe (48) agencé latéralement audit bac principal (46) ; ladite chicane (26) est formée par un seuil de passage (44) disposé entre ledit bac principal (46) et ledit bac de réception (48) ; ledit métal en fusion sortant de ladite busette d'alimentation (22) est versé dans ledit bac de réception (48), et coule dudit bac de réception (48) vers ledit bac principal (46) en passant par débordement au dessus dudit ledit seuil de passage (44). The method of any one of claims 1 to 5, wherein: said riser (14) comprises a main tray (46) and an auxiliary receiving tray (48) arranged laterally to said main tray (46); said baffle (26) is formed by a through threshold (44) disposed between said main tray (46) and said receiving pan (48); said molten metal exiting said feed nozzle (22) is poured into said receiving pan (48), and flows from said receiving pan (48) to said main pan (46) overflowing above said threshold of passage (44). Procédé selon la revendication 8, dans lequel ledit métal en fusion rencontre une chicane auxiliaire (52) avant d'arriver à l'entrée dudit corps de lingotière (12).The method of claim 8, wherein said molten metal encounters an auxiliary baffle (52) prior to arriving at the inlet of said mold body (12). Procédé selon l'une quelconque des revendications précédentes, dans lequel la rehausse (14) comprend un corps réfractaire (18) et un joint réfractaire compact (20) de liaison étanche avec le corps de lingotière (12) présentant une bonne tenue mécanique.A method according to any one of the preceding claims, wherein the riser (14) comprises a refractory body (18) and a compact refractory seal (20) sealingly connected to the mold body (12) having a good mechanical strength. Procédé selon la revendication 10, dans lequel un gaz sous pression est injecté dans ladite lingotière (10) entre ladite rehausse (14) et ledit corps de lingotière (12).The method of claim 10, wherein pressurized gas is injected into said mold (10) between said riser (14) and said mold body (12). Procédé selon l'une quelconque des revendications précédentes, dans lequel la vitesse d'écoulement du métal à la sortie de ladite busette d'alimentation (22) est située entre 50 et 180 m/min.A method as claimed in any one of the preceding claims, wherein the flow velocity of the metal at the outlet of said feed nozzle (22) is between 50 and 180 m / min. Procédé selon l'une quelconque des revendications précédentes, dans lequel la vitesse d'écoulement du métal à l'entrée dudit corps de lingotière (12) est située entre 5 et 10 m/min.A method as claimed in any one of the preceding claims, wherein the flow rate of the metal at the inlet of said mold body (12) is between 5 and 10 m / min.
EP05102919A 2005-04-13 2005-04-13 Continuous casting process of metallic profiles Withdrawn EP1712314A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP05102919A EP1712314A1 (en) 2005-04-13 2005-04-13 Continuous casting process of metallic profiles
PCT/EP2006/061598 WO2006108874A1 (en) 2005-04-13 2006-04-13 Method for continuous casting of blanks of metal sections
EP06725757A EP1877211A1 (en) 2005-04-13 2006-04-13 Method for continuous casting of blanks of metal sections

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EP05102919A EP1712314A1 (en) 2005-04-13 2005-04-13 Continuous casting process of metallic profiles

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EP2723520B1 (en) 2011-06-23 2015-05-20 Arcelormittal Investigacion y Desarrollo, S.L. Method and device for continuously casting a profile member blank
EP2656945A1 (en) 2012-04-26 2013-10-30 SMS Concast AG Fire-proof cast pipe for a mould for strand casting metal melt
CN108080591B (en) * 2017-12-27 2024-01-30 河南中岳非晶新型材料股份有限公司 Amorphous strip integrated spray belt package and package manufacturing method thereof

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JPH01218753A (en) * 1988-02-26 1989-08-31 Kobe Steel Ltd Weir for continuous casting tundish
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WO2006108874A1 (en) 2006-10-19

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