EP0680392A1 - Feed device for gravitationally depositing a granular material on the surface of a continuously cast molten metal - Google Patents

Feed device for gravitationally depositing a granular material on the surface of a continuously cast molten metal

Info

Publication number
EP0680392A1
EP0680392A1 EP95900194A EP95900194A EP0680392A1 EP 0680392 A1 EP0680392 A1 EP 0680392A1 EP 95900194 A EP95900194 A EP 95900194A EP 95900194 A EP95900194 A EP 95900194A EP 0680392 A1 EP0680392 A1 EP 0680392A1
Authority
EP
European Patent Office
Prior art keywords
tube
powder
granular material
straight tube
mold
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.)
Ceased
Application number
EP95900194A
Other languages
German (de)
French (fr)
Inventor
André Klein
Michel Ruiu
Jean-No[L Pontoire
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.)
Techmetal Promotion SA
Original Assignee
Techmetal Promotion 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 Techmetal Promotion SA filed Critical Techmetal Promotion SA
Publication of EP0680392A1 publication Critical patent/EP0680392A1/en
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the present invention relates to the continuous casting of metals and in particular of steel.
  • the invention relates to the supply and the deposition of a layer of a granular material of a more or less fine particle size on the surface of the liquid metal in a continuous casting mold.
  • This material has the particular functions of thermally insulating the molten metal bath, of capturing the non-metallic inclusions which settle out of the liquid metal, of avoiding the reoxidation of the metal, and of ensuring the heat ingot mold / product transfers. and the lubrication of the walls of the mold.
  • This material is usually called “covering powder”, and, for convenience, it will hereinafter be called “powder”, it being understood that its particle size and the shape of the grains can vary widely.
  • This powder melts on contact with the liquid metal and infiltrates between the metal and the walls of the mold, thus playing the role of lubricant.
  • the amount of this contribution varies according to the characteristics of the powder and those of the casting installation and of the metal cast.
  • the consumption of powder can vary during casting as a function of the various operating parameters, and in particular the temperature of the cast metal.
  • This conduit opens into the mold above the surface of the cast metal, at a distance therefrom corresponding to the desired thickness of powder, in the solid or molten state.
  • a such a device is described in particular in document EP 473521.
  • This device makes it possible to ensure an automatic supply of powder, because when the thickness of the latter tends to decrease, the powder flows in the conduit by gravity until the upper level of the layer reaches the level of the discharge port of the conduit, interrupting the flow.
  • this takes advantage of its ability to spread substantially uniformly over the entire section of the ingot mold while taking advantage of the characteristics of the grain materials which are deposited in heaps at the outlet of the supply duct. .
  • the continuous casting mold is overhung by the distributor, which is only a few tens of cm away. It is therefore not possible to install the powder feed hopper above the ingot mold and in the immediate vicinity thereof.
  • the duct must be inclined relative to the horizontal by an angle not exceeding a few tens of degrees. This slight inclination, imposed by the local conditions of congestion of the pouring zone, is an obstacle to a good sliding of the powder inside the duct, which therefore risks clogging. This risk exists especially when using a powder with a fine particle size, less than 100 ⁇ m.
  • the powders most suited to the start-up phases of the casting are precisely powders of small particle size
  • the object of the invention is to provide an installation for the automatic distribution by gravity of covering powder in a continuous ingot mold, which can operate reliably both with powders of small particle size (less than 100 ⁇ m) than with powders of larger particle size.
  • the subject of the invention is a feed device for the simple gravity deposition of a layer of granular material on the surface of a liquid metal contained in a continuous casting ingot mold, comprising a hopper containing said granular material, and connected to a supply duct comprising a portion inclined at a non-zero and non-right angle to the horizontal, and the lower discharge end of which is permanently open and is located above said surface of the metal in the mold at an equal distance or slightly greater than a nominal thickness of the layer of said material, characterized in that, on at least part of said inclined portion, said supply duct is constituted by a rectilinear tube, and in that it comprises means for imparting a rotational movement to said straight tube around its axis, and means for connecting the ends of said straight tube to the remainder of said conduit allowing said rotational movement.
  • the invention consists in imparting a rotation about its axis to at least a portion of the part of the supply duct which is inclined relative to the horizontal. This creates agitation within the powder which minimizes the risk of clogging, and allows the use of fine particle size powders even when the configuration of the continuous casting machine locally requires a relatively small inclination of the conduit.
  • FIG. 1 which shows schematically, in longitudinal section, the upper part of a continuous casting mold equipped with a device for feeding granular material according to the invention, also seen in longitudinal section;
  • FIG. 2 which shows schematically a variant of the device for rotating the rectilinear tube included in the previous device.
  • FIG. 1 a continuous casting ingot mold 1 supplied with liquid metal 2, in a conventional manner, by supply means, not shown, such as a distributor and a submerged nozzle.
  • the liquid metal 2 sees its solidification initiated there by the formation of a solid crust 3 against the walls 4 of the mold 1, vigorously cooled by an internal circulation of water.
  • On the surface of the liquid metal 2 is a layer of covering powder 5 which melts on contact with the metal 2, forming a liquid film 6 of slag which flows gradually towards the walls 4 of the mold 1, infiltrates between them and the solid crust 3 and plays a role of lubricant there.
  • a continuous consumption of powder 5 and this must be replaced permanently to ensure a substantially constant thickness of the powder layer 5.
  • the powder 5 is supplied from a hopper 7 to which is connected a supply conduit 8.
  • the admission of the powder 5 into this conduit 8 is controlled by a valve 32.
  • the terminal part of this conduit 8 is constituted by a bent tubular part 9 made of a rigid material and resistant to relatively high temperatures prevailing above the mold 1. The steel is quite suitable for this use.
  • the lower end 10 of this bent tubular part 9 is permanently open and is held (by means which will be described later) above the surface of the liquid metal 2, at a distance d therefrom. This distance d is equal to or slightly greater than a set thickness of the layer of powder 5 and of slag 6.
  • the duct 8 When the valve 9 is open, the duct 8 is permanently supplied with powder 5 so as to be kept loaded, and the powder 5 pours by simple gravity into the mold 1 until the layer thus formed comes to close off the lower end 10 of the bent tubular part 9, thus interrupting the arrival of powder.
  • This phenomenon continues continuously during the casting, as the powder 5 is consumed, the thickness of which is present in the mold 1 is thus kept constant.
  • the bent tubular part 9 which terminates it is connected, at its upstream end, to a rectilinear tube 11.
  • This tube must be rigid, heat resistant, and present on its internal surface a coefficient of friction with the powder 5 as low as possible to allow easy descent powder 5.
  • Steel, in particular stainless steel, here again, is a material which is particularly suitable for constituting it.
  • the tube 11 is itself connected to the remaining part of the conduit 8.
  • the internal diameter of the tube 11 is of the same order of magnitude as that of the assembly of the conduit 8 and of the bent tubular part 9, namely of the order of 2 to 6 cm.
  • the installation also comprises means for holding the longitudinal axis of the tube 11 in a position such that it makes a non-zero and non-right angle ⁇ with the horizontal, and means for putting the tube it rotating around this axis.
  • these holding means comprise a telescopic bracket 12 fixed to a base 13 made integral with the upper edge 14 of the ingot mold 1.
  • This bracket in the example (not limiting) shown, comprises a vertical rod 15 fixed rigidly to the base 13, a tubular rod 16 fixed to the vertical rod 15 by an articulation 17 making it possible to tilt the tubular rod 16.
  • Inside the tubular rod 16 can slide a rod 18, the depth of penetration into the tubular rod 16 can be adjusted and kept constant by a key 19 or any other equivalent means.
  • This rod 18 is, on the one hand, rigidly connected by a lateral rod 20 to the bent tubular part 9 constituting the terminal part of the conduit, 8.
  • the rod 18 carries at its free end a motor 21 (by electric or pneumatic example) printing on an axis 22 a speed of rotation chosen by the operator.
  • This axis 22 carries at its free end a roller 23, whose outer surface is maintained in contact with the outer wall of the straight tube 11, and whose shape (frustoconical in the example shown) is suitable for this purpose.
  • the roller 23 is made of a material having a high coefficient of friction with the material constituting the straight tube 11, for example rubber if the straight tube 11 is made of steel. The result obtained by this configuration is that the rotation of the roller 23, driven by the axis 22 of the motor 21, causes by friction the rotation of the straight tube 11 around its longitudinal axis.
  • This rotation takes place at an angular speed depending on the speed of rotation of the roller 23 and the respective dimensions of the roller 23 and of the straight tube il. These are chosen so that the angular speed of rotation of the straight tube 11 is of the order, for example, of 1 t / min. To guarantee good friction between the roller 23 and the straight tube 11, it can also be provided to roughen the external surface of the straight tube 11 in the area where it is likely to be in contact with the roller 23. As has been said, the effect of this rotation of the straight tube 11 is to create, within the powder 5 which it contains, permanent agitation which eliminates the risks of clogging of the straight tube 11.
  • the angle ⁇ of inclination of the axis of the rectilinear tube 11 and the distance d between the end 10 of the bent tubular part 9 and the surface of the liquid metal 2 in the ingot mold 1 are adjusted in combination by the operator, which can act on the one hand on the insertion depth of the rod 18 in the tubular rod 16, and, on the other hand, on the orientation given to the tubular rod 16 by the articulation 17.
  • the duct 8, in its part located upstream of the rectilinear tube 11, has means of articulation, or is made over at least a portion of its length in a flexible material.
  • Figure 1 there is shown an installation which is such that, with the angle ⁇ and the distance d chosen, the bent tubular part 9 is found perpendicular to the surface of 1 • liquid steel 2 in the mold 1, but this feature is not at all mandatory.
  • connections between the straight tube 11 and the conduit 8 on the one hand, and the bent tubular part 9 on the other hand, must be designed to allow easy rotation of the straight tube 11. This assumes that the powder 5 cannot constitute a hinders this rotation.
  • these connections can be provided by seals 24, 25 each comprising a bearing integral with the straight tube 11 or the element to which it is connected.
  • seals 24, 25 each comprising a bearing integral with the straight tube 11 or the element to which it is connected.
  • the downstream end 26 of the conduit 8 is inserted into the upstream end 27 of the straight tube 11, and opens downstream of the seal 24;
  • FIG. 2 shows a possible variant of the mode of driving the rectilinear tube in rotation 11.
  • the roller 23 of the previous example it is a pinion 30 which the axis 22 of the motor 21 carries, and this pinion is meshed on a frustoconical ring gear 31 secured to the external wall of the straight tube 11.
  • the minimum value the angle ⁇ of inclination of the straight tube 11 depends on the characteristics of the powder 5, but a value of 20 to 30 ° is sufficient to ensure a regular fall of the usual fine powders whose particles have an average size of less than 100 ⁇ m.
  • the length of the straight tube 11 it depends on the geometry of the continuous casting installation on which the device according to the invention is mounted. But it is quite obvious that it is advantageous for this rectilinear rotary tube 11 to represent a large fraction of the path taken by the powder 5 between the hopper 7 and the ingot mold 1, at least of the non-vertical portion of this path in which, without it, one could encounter problems of flow of the powder 5.
  • this device is primarily designed to dispense powders 5 of fine particle size, it is perfectly compatible with the use of powders 5 of coarser particle size. Likewise, it can be installed on installations for the continuous casting of metals other than steel.

Abstract

A feed device for gravitationally depositing a layer of granular material on the surface of a molten metal (2) in a continuous casting mould (1), including a hopper (7) containing said granular material (5) and connected to a feed pipe (8) which includes a sloping portion at an angle (α) which is neither zero nor 90° relative to the horizontal, and has a permanently open lower discharge end (10) located above the surface of said metal (2) at a distance equal to or slightly greater than the desired layer thickness. In at least a part of said sloping portion, said feed pipe (8) consists of a straight tube (11), and the device includes an assembly for rotating said straight tube (11) about its own axis, and members (24, 25) for linking the ends (27, 28) of said straight tube (11) to the remainder of said pipe (8) to enable rotation.

Description

DISPOSITIF D'ALIMENTATION POUR LE DEPOT PAR SIMPLE GRAVITE FEEDING DEVICE FOR SINGLE GRAVITY DEPOSIT
D'UN MATERIAU GRANULEUX SUR LA SURFACE D'UN METAL LIQUIDEOF A GRANULAR MATERIAL ON THE SURFACE OF A LIQUID METAL
COULE EN CONTINUCONTINUOUS CAST
La présente invention concerne la coulée continue des métaux et en particulier de l'acier.The present invention relates to the continuous casting of metals and in particular of steel.
Plus précisément l'invention concerne l'alimentation et le dépôt d'une couche d'un matériau granuleux d'une granulométrie plus ou moins fine à la surface du métal liquide en lingotiere de coulée continue. Ce matériau a notamment pour fonctions d'isoler thermiquement le bain de métal en fusion, de capter les inclusions non-métalliques qui décantent en provenance du métal liquide, d'éviter la réoxydation du métal, et d'assurer les transferts thermiques lingotière/produit et la lubrification des parois de la lingotiere. Ce matériau est habituellement appelé "poudre de couverture", et, par commodité, il sera appelé par la suite "poudre" étant bien entendu que sa granulométrie et la forme des grains peuvent largement varier. Cette poudre fond au contact du métal liquide et s'infiltre entre le métal et les parois de la lingotiere, jouant ainsi le rôle de lubrifiant. Il en résulte une consommation continue de poudre lors de la coulée, qu'il est nécessaire de compenser par un apport de poudre neuve. L'importance de cet apport varie en fonction des caractéristiques de la poudre et de celles de l'installation de coulée et du métal coulé. De plus la consommation de poudre peut varier en cours de coulée en fonction des différents paramètres opératoires, et notamment de la température du métal coulé. Pour assurer un niveau constant de poudre et donc la régularité de l'épaisseur de la couche de celle-ci, il est connu d'en effectuer l'alimentation par gravité au moyen d'un conduit issu d'une trémie contenant ledit matériau et placée à une altitude supérieure à celle de la lingotiere. Ce conduit débouche dans la lingotiere au-dessus de la surface du métal coulé, à une distance de celle-ci correspondant à l'épaisseur souhaitée de poudre, à l'état solide ou fondu. Un tel dispositif est notamment décrit dans le document EP 473521.More precisely, the invention relates to the supply and the deposition of a layer of a granular material of a more or less fine particle size on the surface of the liquid metal in a continuous casting mold. This material has the particular functions of thermally insulating the molten metal bath, of capturing the non-metallic inclusions which settle out of the liquid metal, of avoiding the reoxidation of the metal, and of ensuring the heat ingot mold / product transfers. and the lubrication of the walls of the mold. This material is usually called "covering powder", and, for convenience, it will hereinafter be called "powder", it being understood that its particle size and the shape of the grains can vary widely. This powder melts on contact with the liquid metal and infiltrates between the metal and the walls of the mold, thus playing the role of lubricant. This results in a continuous consumption of powder during casting, which it is necessary to compensate with a supply of new powder. The amount of this contribution varies according to the characteristics of the powder and those of the casting installation and of the metal cast. In addition, the consumption of powder can vary during casting as a function of the various operating parameters, and in particular the temperature of the cast metal. To ensure a constant level of powder and therefore the regularity of the thickness of the layer thereof, it is known to supply it by gravity by means of a conduit coming from a hopper containing said material and placed at an altitude higher than that of the mold. This conduit opens into the mold above the surface of the cast metal, at a distance therefrom corresponding to the desired thickness of powder, in the solid or molten state. A such a device is described in particular in document EP 473521.
Ce dispositif permet d'assurer une alimentation automatique de poudre, du fait que, lorsque l'épaisseur de celle-ci tend à diminuer, la poudre s'écoule dans le conduit par gravité jusqu'à ce que le niveau supérieur de la couche atteigne le niveau de l'orifice de décharge du conduit, interrompant le débit. On tire ainsi parti, pour automatiser l'alimentation en poudre, de sa faculté à se répandre sensiblement uniformément sur toute la section de la lingotiere tout en profitant des caractéristiques des matériaux en grains qui se déposent en tas à la sortie du conduit d'alimentation. Le conduit, depuis la trémie d'alimentation jusqu'à son extrémité inférieure dont la distance à la surface du métal liquide en lingotiere détermine l'épaisseur de la couche de poudre, est en permanence rempli de poudre sur toute sa longueur et sa section.This device makes it possible to ensure an automatic supply of powder, because when the thickness of the latter tends to decrease, the powder flows in the conduit by gravity until the upper level of the layer reaches the level of the discharge port of the conduit, interrupting the flow. In order to automate the feeding of powder, this takes advantage of its ability to spread substantially uniformly over the entire section of the ingot mold while taking advantage of the characteristics of the grain materials which are deposited in heaps at the outlet of the supply duct. . The conduit, from the feed hopper to its lower end, the distance from the surface of the molten metal in the mold determines the thickness of the powder layer, is permanently filled with powder over its entire length and section.
Dans la pratique habituelle, la lingotiere de coulée continue est surplombée par le répartiteur qui en est distant de seulement quelques dizaines de cm. Il n'est donc pas possible d'installer la trémie d'alimentation en poudre au- dessus de la lingotiere et à proximité immédiate de celle-ci. Une conséquence en est que, sur une longueur qui peut atteindre plusieurs dizaines de cm, le conduit doit être incliné par rapport à l'horizontale d'un angle n'excédant pas quelques dizaines de degrés. Cette faible inclinaison, imposée par les conditions locales d'encombrement de la zone de coulée, est un obstacle à un bon glissement de la poudre à l'intérieur du conduit, qui risque donc de se colmater. Ce risque existe surtout lorsque l'on utilise une poudre à granulométrie fine, inférieure à 100 μm. En effet, dans ces conditions, les frottements des particules entre elles et contre la paroi du conduit sont exacerbés par rapport au cas des poudres de plus forte granulométrie (de 0,3 à 0,8 mm par exemple) . Cela conduit les acieristes à n'utiliser les dispositifs automatiques de distribution de poudre qui viennent d'être décrits qu'avec des poudres de forte granulométrie, et à n'ajouter que manuellement les poudres de granulométrie fine. Cet ajout manuel ne peut garantir une constance satisfaisante de l'épaisseur de la couche de poudre, et cela incite souvent les opérateurs à ajouter, par sécurité ou par erreur d'appréciation, plus de poudre qu'il ne serait nécessaire. Enfin, cet ajout manuel nécessite la présence physique des opérateurs au voisinage de la lingotiere, ce que l'on désire éviter autant que possible pour des raisons d'hygiène et de sécurité (atmosphère chaude et poussiéreuse, risques de débordement de métal liquide) . Or il serait nécessaire de pouvoir indifféremment ajouter automatiquement des poudres de faible et forte granulométrie, car :In usual practice, the continuous casting mold is overhung by the distributor, which is only a few tens of cm away. It is therefore not possible to install the powder feed hopper above the ingot mold and in the immediate vicinity thereof. One consequence is that, over a length which can reach several tens of cm, the duct must be inclined relative to the horizontal by an angle not exceeding a few tens of degrees. This slight inclination, imposed by the local conditions of congestion of the pouring zone, is an obstacle to a good sliding of the powder inside the duct, which therefore risks clogging. This risk exists especially when using a powder with a fine particle size, less than 100 μm. In fact, under these conditions, the friction of the particles with each other and against the wall of the duct is exacerbated compared with the case of powders with a larger particle size (from 0.3 to 0.8 mm for example). This leads steelworkers to use the automatic powder dispensing devices which have just been described only with high powders. granulometry, and to add only manually the fine granulometry powders. This manual addition cannot guarantee satisfactory consistency in the thickness of the powder layer, and this often encourages operators to add, for safety or by error of assessment, more powder than would be necessary. Finally, this manual addition requires the physical presence of the operators in the vicinity of the mold, which we want to avoid as much as possible for health and safety reasons (hot and dusty atmosphere, risk of liquid metal overflowing). However, it would be necessary to be able to automatically add powders of small and large particle size, because:
- les poudres les plus adaptées aux phases de démarrage de la coulée sont précisément des poudres de faible granulométrie ;- the powders most suited to the start-up phases of the casting are precisely powders of small particle size;
- les poudres de forte granulométrie sont parfois relativement riches en carbone, et leur emploi est déconseillé lors de la coulée d'acier à très basse teneur en carbone, qu'elles risquent de polluer ;- powders with a large particle size are sometimes relatively rich in carbon, and their use is not recommended when casting steel with very low carbon content, which they risk polluting;
- les poudres de forte granulométrie sont environ deux fois plus coûteuses que les poudres de faible granulométrie.- powders with a large particle size are approximately twice as expensive as powders with a small particle size.
Le but de 1' invention est de proposer une installation pour la distribution automatique par simple gravité de poudre de couverture dans une lingotiere continue, qui puisse fonctionner de manière fiable aussi bien avec des poudres de faible granulométrie (moins de 100 μm) qu'avec des poudres de plus forte granulométrie.The object of the invention is to provide an installation for the automatic distribution by gravity of covering powder in a continuous ingot mold, which can operate reliably both with powders of small particle size (less than 100 μm) than with powders of larger particle size.
A cet effet, l'invention a pour objet un dispositif d'alimentation pour le dépôt par simple gravité d'une couche d'un matériau granuleux sur la surface d'un métal liquide contenu dans une lingotiere de coulée continue, comprenant une trémie renfermant ledit matériau granuleux, et reliée à un conduit d'alimentation comportant une portion inclinée selon un angle non nul et non droit par rapport à l'horizontale, et dont l'extrémité inférieure de décharge est ouverte en permanence et est située au-dessus de ladite surface du métal dans la lingotiere à une distance égale ou légèrement supérieure à une épaisseur de consigne de la couche dudit matériau, caractérisé en ce que, sur une partie au moins de ladite portion inclinée, ledit conduit d'alimentation est constitué par un tube rectiligne, et en ce qu'il comprend des moyens pour imprimer un mouvement de rotation audit tube rectiligne autour de son axe, et des moyens de connexion des extrémités dudit tube rectiligne au restant dudit conduit autorisant ledit mouvement de rotation. Comme on l'aura compris, l'invention consiste à imprimer une rotation autour de son axe à une portion au moins de la partie du conduit d'alimentation qui est inclinée par rapport à l'horizontale. On crée ainsi une agitation au sein de la poudre qui minimise les risques de colmatage, et permet d'utiliser des poudres de granulométrie fine même lorsque la configuration de la machine de coulée continue impose localement une inclinaison du conduit relativement faible.To this end, the subject of the invention is a feed device for the simple gravity deposition of a layer of granular material on the surface of a liquid metal contained in a continuous casting ingot mold, comprising a hopper containing said granular material, and connected to a supply duct comprising a portion inclined at a non-zero and non-right angle to the horizontal, and the lower discharge end of which is permanently open and is located above said surface of the metal in the mold at an equal distance or slightly greater than a nominal thickness of the layer of said material, characterized in that, on at least part of said inclined portion, said supply duct is constituted by a rectilinear tube, and in that it comprises means for imparting a rotational movement to said straight tube around its axis, and means for connecting the ends of said straight tube to the remainder of said conduit allowing said rotational movement. As will be understood, the invention consists in imparting a rotation about its axis to at least a portion of the part of the supply duct which is inclined relative to the horizontal. This creates agitation within the powder which minimizes the risk of clogging, and allows the use of fine particle size powders even when the configuration of the continuous casting machine locally requires a relatively small inclination of the conduit.
L'invention sera mieux comprise à la lecture de la description qui suit, donnée en référence aux figures annexées suivantes :The invention will be better understood on reading the description which follows, given with reference to the following appended figures:
- la figure 1 qui schématise, vue en coupe longitudinale, la partie supérieure d'une lingotiere de coulée continue équipée d'un dispositif d'alimentation en matériau granuleux selon l'invention, également vu en coupe longitudinale ;- Figure 1 which shows schematically, in longitudinal section, the upper part of a continuous casting mold equipped with a device for feeding granular material according to the invention, also seen in longitudinal section;
- la figure 2 qui schématise une variante du dispositif de mise en rotation du tube rectiligne inclus dans le dispositif précédent.- Figure 2 which shows schematically a variant of the device for rotating the rectilinear tube included in the previous device.
Sur la figure 1 est représentée une lingotiere de coulée continue 1 alimentée en métal liquide 2, de manière classique, par des moyens d'alimentation non représentés tels qu'un répartiteur et une busette immergée. Le métal liquide 2 y voit sa solidification s'initier par formation d'une croûte solide 3 contre les parois 4 de la lingotiere 1, énergiquement refroidies par une circulation interne d'eau. Sur la surface du métal liquide 2 se trouve une couche de poudre de couverture 5 qui fond au contact du métal 2 en formant un film liquide 6 de laitier qui s'écoule progressivement vers les parois 4 de la lingotiere 1, s'infiltre entre celles-ci et la croûte solide 3 et y joue un rôle de lubrifiant. Il y a ainsi, lors de la coulée, une consommation continue de poudre 5, et celle-ci doit être remplacée en permanence pour assurer une épaisseur sensiblement constante de la couche de poudre 5.In FIG. 1 is shown a continuous casting ingot mold 1 supplied with liquid metal 2, in a conventional manner, by supply means, not shown, such as a distributor and a submerged nozzle. The liquid metal 2 sees its solidification initiated there by the formation of a solid crust 3 against the walls 4 of the mold 1, vigorously cooled by an internal circulation of water. On the surface of the liquid metal 2 is a layer of covering powder 5 which melts on contact with the metal 2, forming a liquid film 6 of slag which flows gradually towards the walls 4 of the mold 1, infiltrates between them and the solid crust 3 and plays a role of lubricant there. There is thus, during casting, a continuous consumption of powder 5, and this must be replaced permanently to ensure a substantially constant thickness of the powder layer 5.
L'alimentation en poudre 5 est assurée à partir d'une trémie 7 à laquelle est connecté un conduit d'alimentation 8. L'admission de la poudre 5 dans ce conduit 8 est commandée par une vanne 32. Classiquement, la partie terminale de ce conduit 8 est constituée par une pièce tubulaire coudée 9 en un matériau rigide et résistant aux températures relativement élevées régnant au-dessus de la lingotiere 1. L'acier convient tout à fait à cet usage. L'extrémité inférieure 10 de cette pièce tubulaire coudée 9 est ouverte en permanence et est maintenue (par des moyens qui seront décrits plus loin) au-dessus de la surface du métal liquide 2, à une distance d de celle-ci. Cette distance d est égale ou légèrement supérieure à une épaisseur de consigne de la couche de poudre 5 et de laitier 6. Lorsque la vanne 9 est ouverte, le conduit 8 est approvisionné en permanence en poudre 5 de manière à être maintenu en charge, et la poudre 5 se déverse par simple gravité dans la lingotiere 1 jusqu'à ce que la couche ainsi formée vienne obturer l'extrémité inférieure 10 de la pièce tubulaire coudée 9, interrompant ainsi l'arrivée de poudre. Ce phénomène se poursuit continûment pendant la coulée, au fur et à mesure de la consommation de la poudre 5, dont 1'épaisseur présente dans la lingotiere 1 est ainsi maintenue constante. Selon l'invention, afin, comme on l'a dit, de permettre l'utilisation d'une poudre 5 de fine granulométrie sans risquer un colmatage du conduit 8 dans sa portion faiblement inclinée, celui-ci est constitué de la manière suivante. La pièce tubulaire coudée 9 qui le termine est connectée, à son extrémité amont, à un tube rectiligne 11. Ce tube il doit être rigide, résistant à la chaleur, et présenter sur sa surface interne un coefficient de frottement avec la poudre 5 aussi faible que possible pour permettre une descente aisée de la poudre 5. L'acier, en particulier l'acier inoxydable, là encore, est un matériau particulièrement adapté pour le constituer. A son extrémité amont, le tube 11 est lui-même connecté à la partie restante du conduit 8. Le diamètre intérieur du tube 11 est du même ordre de grandeur que celui de l'ensemble du conduit 8 et de la pièce tubulaire coudée 9, à savoir de l'ordre de 2 à 6 cm. Selon l'invention, l'installation comporte également des moyens de maintien de l'axe longitudinal du tube 11 dans une position telle qu'il fait un angle α non nul et non droit avec l'horizontale, et des moyens pour mettre le tube il en rotation autour de cet axe. Dans l'exemple représenté, ces moyens de maintien comportent une potence télescopique 12 fixée à un socle 13 rendu solidaire du bord supérieur 14 de la lingotiere 1. Cette potence, dans l'exemple (non limitatif) représenté, comporte une tige verticale 15 fixée rigidement au socle 13, une tige tubulaire 16 fixé à la tige verticale 15 par une articulation 17 permettant d'incliner la tige tubulaire 16. A l'intérieur de la tige tubulaire 16 peut coulisser une tige 18, dont la profondeur de pénétration dans la tige tubulaire 16 peut être réglée et maintenue constante par une clavette 19 ou tout autre moyen équivalent. Cette tige 18 est, d'une part, reliée rigidement par une tige latérale 20 à la pièce tubulaire coudée 9 constituant la partie terminale du conduit , 8. D'autre part, la tige 18 porte à son extrémité libre un moteur 21 (par exemple électrique ou pneumatique) imprimant à un axe 22 une vitesse de rotation choisie par l'opérateur. Cet axe 22 porte à son extrémité libre un galet 23, dont la surface extérieure est maintenue en contact avec la paroi externe du tube rectiligne 11, et dont la forme (tronconique dans l'exemple représenté) est adaptée à cet effet. Le galet 23 est en un matériau présentant un coefficient de frottement élevé avec le matériau constitutif du tube rectiligne 11, par exemple en caoutchouc si le tube rectiligne 11 est en acier. Le résultat procuré par cette configuration est que la rotation du galet 23, entraîné par l'axe 22 du moteur 21, provoque par frottement la rotation du tube rectiligne 11 autour de son axe longitudinal. Cette rotation s'effectue à une vitesse angulaire dépendant de la vitesse de rotation du galet 23 et des dimensions respectives du galet 23 et du tube rectiligne il. Celles-ci sont choisies de telle manière que la vitesse angulaire de rotation du tube rectiligne 11 soit de l'ordre, par exemple, de 1 t/min. Pour garantir un bon frottement entre le galet 23 et le tube rectiligne il, on peut aussi prévoir de rendre rugueuse la surface externe du tube rectiligne 11 dans la zone où elle est susceptible d'être au contact du galet 23. Comme on l'a dit, l'effet de cette rotation du tube rectiligne 11 est de créer, au sein de la poudre 5 qu'il renferme, une agitation permanente qui supprime les risques de colmatage du tube rectiligne 11.The powder 5 is supplied from a hopper 7 to which is connected a supply conduit 8. The admission of the powder 5 into this conduit 8 is controlled by a valve 32. Conventionally, the terminal part of this conduit 8 is constituted by a bent tubular part 9 made of a rigid material and resistant to relatively high temperatures prevailing above the mold 1. The steel is quite suitable for this use. The lower end 10 of this bent tubular part 9 is permanently open and is held (by means which will be described later) above the surface of the liquid metal 2, at a distance d therefrom. This distance d is equal to or slightly greater than a set thickness of the layer of powder 5 and of slag 6. When the valve 9 is open, the duct 8 is permanently supplied with powder 5 so as to be kept loaded, and the powder 5 pours by simple gravity into the mold 1 until the layer thus formed comes to close off the lower end 10 of the bent tubular part 9, thus interrupting the arrival of powder. This phenomenon continues continuously during the casting, as the powder 5 is consumed, the thickness of which is present in the mold 1 is thus kept constant. According to the invention, in order, as has been said, to allow the use of a powder 5 of fine particle size without risking clogging of the conduit 8 in its slightly inclined portion, it is constituted in the following manner. The bent tubular part 9 which terminates it is connected, at its upstream end, to a rectilinear tube 11. This tube must be rigid, heat resistant, and present on its internal surface a coefficient of friction with the powder 5 as low as possible to allow easy descent powder 5. Steel, in particular stainless steel, here again, is a material which is particularly suitable for constituting it. At its upstream end, the tube 11 is itself connected to the remaining part of the conduit 8. The internal diameter of the tube 11 is of the same order of magnitude as that of the assembly of the conduit 8 and of the bent tubular part 9, namely of the order of 2 to 6 cm. According to the invention, the installation also comprises means for holding the longitudinal axis of the tube 11 in a position such that it makes a non-zero and non-right angle α with the horizontal, and means for putting the tube it rotating around this axis. In the example shown, these holding means comprise a telescopic bracket 12 fixed to a base 13 made integral with the upper edge 14 of the ingot mold 1. This bracket, in the example (not limiting) shown, comprises a vertical rod 15 fixed rigidly to the base 13, a tubular rod 16 fixed to the vertical rod 15 by an articulation 17 making it possible to tilt the tubular rod 16. Inside the tubular rod 16 can slide a rod 18, the depth of penetration into the tubular rod 16 can be adjusted and kept constant by a key 19 or any other equivalent means. This rod 18 is, on the one hand, rigidly connected by a lateral rod 20 to the bent tubular part 9 constituting the terminal part of the conduit, 8. On the other hand, the rod 18 carries at its free end a motor 21 (by electric or pneumatic example) printing on an axis 22 a speed of rotation chosen by the operator. This axis 22 carries at its free end a roller 23, whose outer surface is maintained in contact with the outer wall of the straight tube 11, and whose shape (frustoconical in the example shown) is suitable for this purpose. The roller 23 is made of a material having a high coefficient of friction with the material constituting the straight tube 11, for example rubber if the straight tube 11 is made of steel. The result obtained by this configuration is that the rotation of the roller 23, driven by the axis 22 of the motor 21, causes by friction the rotation of the straight tube 11 around its longitudinal axis. This rotation takes place at an angular speed depending on the speed of rotation of the roller 23 and the respective dimensions of the roller 23 and of the straight tube il. These are chosen so that the angular speed of rotation of the straight tube 11 is of the order, for example, of 1 t / min. To guarantee good friction between the roller 23 and the straight tube 11, it can also be provided to roughen the external surface of the straight tube 11 in the area where it is likely to be in contact with the roller 23. As has been said, the effect of this rotation of the straight tube 11 is to create, within the powder 5 which it contains, permanent agitation which eliminates the risks of clogging of the straight tube 11.
L'angle α d'inclinaison de l'axe du tube rectiligne 11 et la distance d entre l'extrémité 10 de la pièce tubulaire coudée 9 et la surface du métal liquide 2 dans la lingotiere 1 sont réglées en combinaison par l'opérateur, qui peut agir d'une part sur la profondeur d'insertion de la tige 18 dans la tige tubulaire 16, et, d'autre part, sur l'orientation conférée à la tige tubulaire 16 par l'articulation 17. Pour permettre ce réglage, il faut, de plus, que le conduit 8, dans sa partie située en amont du tube rectiligne 11, possède des moyens d'articulation, ou soit réalisé sur au moins une portion de sa longueur en un matériau souple. Sur la figure 1, on a représenté une installation qui est telle que, avec l'angle α et la distance d choisies, la pièce tubulaire coudée 9 se retrouve perpendiculaire à la surface de 1•acier liquide 2 dans la lingotiere 1, mais cette caractéristique n'est pas du tout obligatoire.The angle α of inclination of the axis of the rectilinear tube 11 and the distance d between the end 10 of the bent tubular part 9 and the surface of the liquid metal 2 in the ingot mold 1 are adjusted in combination by the operator, which can act on the one hand on the insertion depth of the rod 18 in the tubular rod 16, and, on the other hand, on the orientation given to the tubular rod 16 by the articulation 17. To allow this adjustment , it is also necessary that the duct 8, in its part located upstream of the rectilinear tube 11, has means of articulation, or is made over at least a portion of its length in a flexible material. In Figure 1, there is shown an installation which is such that, with the angle α and the distance d chosen, the bent tubular part 9 is found perpendicular to the surface of 1 • liquid steel 2 in the mold 1, but this feature is not at all mandatory.
Les connexions entre le tube rectiligne 11 et le conduit 8 d'une part, et la pièce tubulaire coudée 9 d'autre part, doivent être conçues pour permettre une rotation aisée du tube rectiligne 11. Cela suppose que la poudre 5 ne puisse constituer une gêne à cette rotation. A cet effet, comme représenté sur la figure 1, ces connexions peuvent être assurées par des joints 24, 25 comportant chacun un roulement solidaire du tube rectiligne 11 ou de l'élément auquel il est connecté. De plus, afin que la poudre 5 ne puisse gripper le fonctionnement des joints 24, 25, il est préférable que : - l'extrémité aval 26 du conduit 8 soit insérée dans l'extrémité amont 27 du tube rectiligne 11, et débouche en aval du joint 24 ;The connections between the straight tube 11 and the conduit 8 on the one hand, and the bent tubular part 9 on the other hand, must be designed to allow easy rotation of the straight tube 11. This assumes that the powder 5 cannot constitute a hinders this rotation. To this end, as shown in Figure 1, these connections can be provided by seals 24, 25 each comprising a bearing integral with the straight tube 11 or the element to which it is connected. In addition, so that the powder 5 cannot seize the operation of the seals 24, 25, it is preferable that: - The downstream end 26 of the conduit 8 is inserted into the upstream end 27 of the straight tube 11, and opens downstream of the seal 24;
- et que l'extrémité aval 28 du tube rectiligne 11 soit insérée dans l'extrémité amont 29 de la pièce tubulaire coudée 9 et débouche en aval du joint 25.- and that the downstream end 28 of the rectilinear tube 11 is inserted into the upstream end 29 of the bent tubular part 9 and opens downstream of the joint 25.
La figure 2 montre une variante possible du mode d'entraînement en rotation du tube rectiligne 11. Au lieu du galet 23 de l'exemple précédent, c'est un pignon 30 que porte l'axe 22 du moteur 21, et ce pignon est engrené sur une couronne dentée tronconique 31 solidaire de la paroi externe du tube rectiligne 11. On obtient ainsi une mise en rotation du tube rectiligne 11 plus fiable que si elle était réalisée par simple frottement du galet 23 sur le tube rectiligne 11. La valeur minimale de l'angle α d'inclinaison du tube rectiligne 11 dépend des caractéristiques de la poudre 5, mais une valeur de 20 à 30° est suffisante pour assurer une chute régulière des poudres fines habituelles dont les particules ont une dimension moyenne de moins de 100 μm. Quant à la longueur du tube rectiligne 11, elle dépend de la géométrie de l'installation de coulée continue sur laquelle le dispositif selon l'invention est monté. Mais il est bien évident qu'on a intérêt à ce que ce tube rectiligne 11 rotatif représente une fraction importante du parcours qu'effectue la poudre 5 entre la trémie 7 et la lingotiere 1, du moins de la portion non verticale de ce parcours dans laquelle, sans cela, on pourrait rencontrer des problèmes d'écoulement de la poudre 5.FIG. 2 shows a possible variant of the mode of driving the rectilinear tube in rotation 11. Instead of the roller 23 of the previous example, it is a pinion 30 which the axis 22 of the motor 21 carries, and this pinion is meshed on a frustoconical ring gear 31 secured to the external wall of the straight tube 11. This gives a rotation of the straight tube 11 more reliable than if it were carried out by simple friction of the roller 23 on the straight tube 11. The minimum value the angle α of inclination of the straight tube 11 depends on the characteristics of the powder 5, but a value of 20 to 30 ° is sufficient to ensure a regular fall of the usual fine powders whose particles have an average size of less than 100 μm. As for the length of the straight tube 11, it depends on the geometry of the continuous casting installation on which the device according to the invention is mounted. But it is quite obvious that it is advantageous for this rectilinear rotary tube 11 to represent a large fraction of the path taken by the powder 5 between the hopper 7 and the ingot mold 1, at least of the non-vertical portion of this path in which, without it, one could encounter problems of flow of the powder 5.
Bien entendu, si ce dispositif est prioritairement conçu pour distribuer des poudres 5 de granulométrie fine, il est parfaitement compatible avec l'utilisation des poudres 5 de granulométrie plus grossière. De même, il peut être installé sur des installations de coulée continue d'autres métaux que l'acier. Of course, if this device is primarily designed to dispense powders 5 of fine particle size, it is perfectly compatible with the use of powders 5 of coarser particle size. Likewise, it can be installed on installations for the continuous casting of metals other than steel.

Claims

REVENDICATIONS
1) Dispositif d'alimentation pour le dépôt par simple gravité d'une couche d'un matériau granuleux sur la surface1) Feeding device for the simple gravity deposition of a layer of granular material on the surface
5 d'un métal liquide (2) contenu dans une lingotiere de coulée continue (1) , comprenant une trémie (7) renfermant ledit matériau granuleux (5), et reliée à un conduit d'alimentation (8) comportant une portion inclinée selon un angle (α) non nul et non droit par rapport à l'horizontale, et dont5 of a liquid metal (2) contained in a continuous casting mold (1), comprising a hopper (7) containing said granular material (5), and connected to a supply duct (8) comprising an inclined portion according to a non-zero and non-right angle (α) with respect to the horizontal, and of which
10 l'extrémité inférieure (10) de décharge est ouverte en permanence et est située au-dessus de ladite surface du métal (2) dans la lingotiere (1) à une distance (d) égale ou légèrement supérieure à une épaisseur de consigne de la couche dudit matériau (5) , caractérisé en ce que, sur une10 the lower discharge end (10) is permanently open and is located above said surface of the metal (2) in the mold (1) at a distance (d) equal to or slightly greater than a reference thickness of the layer of said material (5), characterized in that, on a
15 partie au moins de ladite portion inclinée, ledit conduit d'alimentation (8) est constitué par un tube rectiligne (11), et en ce qu'il comprend des moyens pour imprimer un mouvement de rotation audit tube rectiligne (11) autour de son axe, et des moyens (24, 25) de connexion des extrémités (27, 28)At least part of said inclined portion, said supply duct (8) is constituted by a rectilinear tube (11), and in that it comprises means for imparting a rotational movement to said rectilinear tube (11) around its axis, and means (24, 25) for connecting the ends (27, 28)
20 dudit tube rectiligne (11) au restant dudit conduit (8) autorisant ledit mouvement de rotation.20 of said rectilinear tube (11) to the remainder of said conduit (8) allowing said rotational movement.
2) Dispositif selon la revendication 1, caractérisé en ce que lesdits moyens pour imprimer un mouvement de rotation2) Device according to claim 1, characterized in that said means for imparting a rotational movement
25 audit tube comportent un moteur (21) mettant en rotation un galet (23) , ledit galet (23) frottant contre la surface externe dudit tube rectiligne (11) .25 in said tube comprise a motor (21) rotating a roller (23), said roller (23) rubbing against the external surface of said straight tube (11).
3) Dispositif selon la revendication 1, caractérisé en <$ 30 ce que lesdits moyens pour imprimer un mouvement de rotation audit tube comportent un moteur (21) mettant en rotation un pignon (30) engrené sur une couronne dentée (31) solidaire dudit tube rectiligne (11) .3) Device according to claim 1, characterized in <$ 30 that said means for imparting a rotational movement to said tube comprises a motor (21) rotating a pinion (30) meshed on a ring gear (31) integral with said tube straight (11).
35 4) Dispositif selon l'une des revendications 1 à 3, caractérisé en ce que lesdits moyens (24, 25) de connexion des extrémités (27, 28) dudit tube au restant dudit conduit comportent des roulements. 5) Dispositif selon l'une des revendications 1 à 4, caractérisé en ce qu'il comporte des moyens (15, 16, 17, 18, 19, 20) pour régler la valeur dudit angle (α) . 4) Device according to one of claims 1 to 3, characterized in that said means (24, 25) for connecting the ends (27, 28) of said tube to the remainder of said conduit comprise bearings. 5) Device according to one of claims 1 to 4, characterized in that it comprises means (15, 16, 17, 18, 19, 20) for adjusting the value of said angle (α).
EP95900194A 1993-11-30 1994-11-07 Feed device for gravitationally depositing a granular material on the surface of a continuously cast molten metal Ceased EP0680392A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9314487 1993-11-30
FR9314487A FR2713116B1 (en) 1993-11-30 1993-11-30 Feeding device for the simple gravity deposition of a granular material on the surface of a continuously poured liquid metal.
PCT/FR1994/001281 WO1995015234A1 (en) 1993-11-30 1994-11-07 Feed device for gravitationally depositing a granular material on the surface of a continuously cast molten metal

Publications (1)

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EP0680392A1 true EP0680392A1 (en) 1995-11-08

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EP95900194A Ceased EP0680392A1 (en) 1993-11-30 1994-11-07 Feed device for gravitationally depositing a granular material on the surface of a continuously cast molten metal

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EP (1) EP0680392A1 (en)
JP (1) JPH08506278A (en)
KR (1) KR960700113A (en)
CN (1) CN1116414A (en)
AU (1) AU8110194A (en)
BR (1) BR9406074A (en)
CA (1) CA2155021A1 (en)
CZ (1) CZ200495A3 (en)
FI (1) FI953616A (en)
FR (1) FR2713116B1 (en)
PL (1) PL309697A1 (en)
TW (1) TW274063B (en)
WO (1) WO1995015234A1 (en)
ZA (1) ZA948954B (en)

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SE515012C2 (en) * 1994-06-17 2001-05-28 Sandvik Ab Feeding of casting powder
JP4617756B2 (en) * 2004-07-28 2011-01-26 Ｊｆｅスチール株式会社 Method of charging molten powder
DE102006005861A1 (en) 2006-02-09 2007-08-23 Aicuris Gmbh & Co. Kg Substituted quinolones III
BR112012029141A2 (en) * 2010-05-20 2021-08-03 Nippon Steel & Sumitomo Metal Corporation flux charging apparatus, continuous casting equipment, flux charging method and continuous casting method
WO2013017251A1 (en) * 2011-08-02 2013-02-07 Tata Steel Nederland Technology B.V. Supply nozzle for powder or granular material
CN104220190B (en) * 2012-03-28 2018-08-28 安赛乐米塔尔研发有限公司 The continuous casing of metal

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FR2666035A1 (en) * 1990-08-27 1992-02-28 Lorraine Laminage METHOD AND DEVICE FOR SUPPLYING A POWDERED OR GRANULATED MATERIAL IN A CONTINUOUS CASTING LINGOTIERE.

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Title
See references of WO9515234A1 *

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ZA948954B (en) 1995-07-17
CZ200495A3 (en) 1995-12-13
FI953616A0 (en) 1995-07-28
FR2713116B1 (en) 1996-01-12
FI953616A (en) 1995-07-28
CA2155021A1 (en) 1995-06-08
FR2713116A1 (en) 1995-06-09
AU8110194A (en) 1995-06-19
TW274063B (en) 1996-04-11
PL309697A1 (en) 1995-10-30
BR9406074A (en) 1996-01-16
CN1116414A (en) 1996-02-07
JPH08506278A (en) 1996-07-09
KR960700113A (en) 1996-01-19
WO1995015234A1 (en) 1995-06-08

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