EP0891236A1 - Ingot mould for the continuous vertical casting of metals - Google Patents
Ingot mould for the continuous vertical casting of metalsInfo
- Publication number
- EP0891236A1 EP0891236A1 EP97916508A EP97916508A EP0891236A1 EP 0891236 A1 EP0891236 A1 EP 0891236A1 EP 97916508 A EP97916508 A EP 97916508A EP 97916508 A EP97916508 A EP 97916508A EP 0891236 A1 EP0891236 A1 EP 0891236A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- slot
- gas
- ingot mold
- slit
- 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.)
- Granted
Links
- 238000005058 metal casting Methods 0.000 title 1
- 239000007789 gas Substances 0.000 claims abstract description 28
- 239000011261 inert gas Substances 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 27
- 229910052751 metal Inorganic materials 0.000 claims description 27
- 238000009826 distribution Methods 0.000 claims description 12
- 238000009749 continuous casting Methods 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 9
- 238000005192 partition Methods 0.000 claims description 8
- 238000010408 sweeping Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 150000002739 metals Chemical class 0.000 claims description 4
- 239000011819 refractory material Substances 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 15
- 239000007924 injection Substances 0.000 abstract description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052802 copper Inorganic materials 0.000 abstract description 9
- 239000010949 copper Substances 0.000 abstract description 9
- 229910000881 Cu alloy Inorganic materials 0.000 abstract description 3
- 238000010926 purge Methods 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 238000007711 solidification Methods 0.000 description 10
- 230000008023 solidification Effects 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 210000002816 gill Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- B22D11/04—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
- 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
- B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
Definitions
- the present invention relates to the Continuous Casting in Vertical Load of metals, in particular steel. It is known that Continuous Vertical Load Casting is essentially distinguished from Classic Vertical Continuous Casting by the fact that the cooled ingot mold body (generally made of copper or copper alloy) ensuring the peripheral solidification of the cast metal, is overcome by a extension in refractory material containing a reserve of molten metal maintained in the liquid state (FR-A-2 000 365). In this way, the place in the copper body where the solidification of the cast metal begins is decoupled from that where the free surface of the molten metal in the riser is located, whereas they are almost confused in Vertical Continuous Casting Classic.
- the aim is thus to be able to flow good quality products with high extraction speeds, because the solidification zone is no longer disturbed by the usual turbulence in the flow of metal arriving in the mold, which is then confined in the buffer volume. within the enhancement. It is also known to carry out a sweeping with inert gas, of argon for example, by injection of waste gas at the interface between the body of the mold and the extension. Such an arrangement is, for example, described in Patent Application EP-A-620,062 in the name of the Applicant. This sweeping is intended to break the slightly homogeneous parasitic solidification veil which tends to form by contact of the molten metal with the wall of the refractory riser.
- FIG. 1 An injection technology shown in Figure 1 attached. Essentially, it is an annular slot (8), continuous, or segmented, opening at the inner periphery of the mold.
- the scanning slit (8) is traversed by a stream of argon lost from an annular distribution chamber (1 3) formed in the vicinity of the slit and making it possible to maintain an identical gas pressure at all points of the perimeter in said room. Tubes (12) with low pressure drop connect this chamber (1 5) to the gas source constituted by a box 10 attached to the ingot mold.
- the main pressure drop of the flow of the injected gas is located at the level of the scanning slot (8) and is closely linked to the geometry thereof, and more particularly to the thickness of slot. If the surfaces facing each other (the upper face of the cooled metal body (1) of the ingot mold and the lower face of the refractory extension (2) are not strictly parallel, a local variation of the the slit thickness then leads to a heterogeneous argon injection flow rate around the periphery of the mold and therefore to possible surface defects on the cast product.
- the object of the present invention is to ensure a gas injection rate with regular and constant sweeping over the entire perimeter of the mold throughout the casting operation.
- the subject of the invention is a mold for continuous casting in vertical load of metals, in particular steel, constituted by a cooled metallic body defining a passage for the cast product and surmounted by an extension made of refractory material, and at the interface of which a sweeping slot is formed by which a stream of lost inert gas is injected along the inside periphery of the ingot mold, from a distribution chamber formed in the vicinity of the slot, and itself supplied with gas by pipes which connect it to a source of gas under pressure, an ingot mold characterized in that the scanning slot is segmented around the periphery of the ingot mold by means of separation means which also segment said distribution chamber into contiguous compartments along the periphery of the mold, and in that calibrated intake pipes are provided at each compartment thus formed p or connect it to the source of pressurized gas.
- the invention therefore essentially consists in serving as a stream of sweeping gas a non-continuous injection slot around the periphery of the ingot mold by a chamber which runs along it, itself segmented into independent compartments along this periphery.
- a plurality of autonomous injection circuits mounted in parallel and each comprising " : a calibrated intake manifold opening into a compartment extended by a scanning slot serving in gas only a portion of the periphery of the ingot mold, the juxtaposition of these slots according to their length ensuring gas distribution along the entire internal perimeter of the mold.
- the length of the slot coincides with that of the associated compartment.
- any disturbance of the gas flow in any circuit due to an external cause for example the accidental narrowing of a scanning slot, has no influence on the flow rate in the neighboring circuits.
- the injection perimeter around the periphery of the ingot mold thus becomes not very sensitive to local failures, unlike the prior art where a punctual anomaly of the scanning slot can lead to degrading the gas flow characteristics over a part of the periphery significantly larger than that directly affected by the incident.
- FIG. 1 shows, in vertical section, the upper part of a mold for Continuous Casting under Vertical Load provided with a gas injection circuit according to the Prior Art already mentioned;
- FIG. 2 shows, also in vertical section along the plane BB 'of Figure 3, an enlarged view of the gas injection circuit which is provided with the upper part of a mold for Continuous Casting in Vertical Charge according to invention
- FIG. 3 shows the injection circuit seen along the cutting plane A-A 'of Figure 1.
- the same elements are designated by identical references.
- the molten metal is introduced into an ingot mold, with a flow rate adjusted to that with which the cast metal comes out of it, using a refractory nozzle 5 opening into the bottom of a casting distributor, not shown, placed at the above.
- the nozzle is provided at its lower part with lateral openings 6 through which the molten metal flows into the ingot mold.
- the control of the flow rate of "metal” keeps the free surface 7 of the molten metal at a controlled height level about ten centimeters above the openings 6 (taking into account the fluctuations due to the vertical oscillation of the mold). As can be understood, this upper part of the cast metal (15-
- a current of inert sweeping gas is however advised on the inside periphery of the ingot mold just above the upper edge of the copper element where solidification is initiated.
- This sweeping current allows a solid and regular start of the solidification process by breaking the parasitic solidification veil that can form 37792 5 PC17FR97 / 00546
- this scanning current is produced by a supply circuit comprising, from an argon pressure source 10, calibrated pipes 12 connecting this source to an internal distribution chamber 13 traversing the periphery of the ingot mold and from which a slot 8 opens out into the mold between the extension 2 and the body at the center 1.
- this slot is made between the two aforementioned elements by means of a calibrated spacer spacer 19 inserted at the periphery of the copper element 1.
- the solution proposed to the problems posed by the above-mentioned scanning circuit for the regularity of distribution of the gas outlet flow rate according to the inner periphery of the mold consists of:
- a first chamber 20 serves to contain a volume of argon under a given pressure.
- the calibrated pipes 12 connect this chamber to the second chamber 13 whose role, as we have seen, is to distribute the gas in the scanning slot 8 which opens to the interior surface 17 of the ingot mold 1 around the periphery thereof. this.
- the scanning slot 8 is divided into juxtaposed sectors, separated from each other by partitions 21 which in the same way share the second distribution chamber 13 in compartments 1 3'-13 "... juxtaposed along the periphery of the ingot mold and in Coincidence with the partition of the slot.
- each partition 21 comprises an advanced part 21 a of low height, corresponding to the thickness of the slot 8 in which it takes position, and a mother part 21 b whose surface corresponds to the section of the chamber 13 to be partitioned.
- segmentation in accordance with the invention makes it possible to divide in a ratio of five, or even eight, the influence of the local variations in thickness of the slot 8 on the overall flow rate of gas injected in the mold.
- each elementary circuit thus formed is supplied in an identical and constant manner by the general pressure chamber 20 and the assembly becomes not very sensitive to local variations slot thickness, or more generally, any localized disturbance of the injection circuit for reasons external to the circuit.
- partitions 21, which divide both the slot 8 and the chamber 13 it is understood that any other means than that described, fulfilling this double function may be suitable, like plates (equivalent 21 b) for partialization of the chamber 13, associated with ribs (equiv. 21 a) formed on the upper face of the copper element and cooperating with the refractory part above to define the slots, knowing that the order of magnitude of the thickness e of scanning slit can be about 0.1 -0.3 mm.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Confectionery (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
Lingotière de Coulée Continue en Charge Verticale des métaux. Continuous casting ingot in vertical load of metals.
La présente invention concerne la Coulée Continue en Charge Verticale des métaux, notamment de l'acier. II est connu que la Coulée Continue en Charge Verticale se distingue essentiellement de la Coulée Continue Verticale Classique par le fait que le corps de lingotière refroidi (généralement en cuivre ou en alliage de cuivre) assurant la solidification périphérique du métal coulé, est surmonté par une rehausse en matériau réfractaire contenant une réserve de métal en fusion maintenu à l'état liquide (FR-A-2 000 365) . De cette manière, l'endroit, dans le corps en cuivre, où commence la solidification du métal coulé est découplé de celui où se situe la surface libre du métal en fusion dans la rehausse, alors qu'ils sont quasiment confondus en Coulée Continue Verticale Classique. On vise ainsi à pouvoir couler des produits de bonne qualité avec des vitesses d'extraction élevées, car la zone de solidification n'est plus perturbée par les habituelles turbulences d'écoulement du métal arrivant en lingotière, qui sont alors confinées dans le volume tampon au sein de la rehausse. II est également connu d'effectuer un balayage au gaz inerte, de l'argon par exemple, par injection de gaz perdu à l'interface entre le corps de lingotière et la rehausse. Une telle disposition est, par exemple, décrite dans la Demande de Brevet EP-A-620 062 au nom du Demandeur. Ce balayage est destiné à briser le voile de solidification parasite peu homogène qui a tendance à se former par contact du métal en fusion avec la paroi de la rehausse réfractaire. De cette manière, on crée des conditions favorables au démarrage d'une solidification franche et régulière du métal coulé toujours au même endroit de la lingotière, à savoir au niveau de l'arête supérieure du corps métallique refroidi à la limite de la rehausse. Le Document précité décrit une technologie d'injection montrée sur la figure 1 jointe. Pour l'essentiel, il s'agit d'une fente annulaire (8), continue, ou segmentée, débouchant à la périphérie intérieure de la lingotière. La fente de balayage (8) est parcourue par un courant d'argon perdu à partir d'une chambre de répartition annulaire (1 3) ménagée au voisinage de la fente et permettant de maintenir une pression de gaz identique en tout point du périmètre dans ladite chambre. Des tubulures (12) à faible perte de charge relient cette chambre (1 5) à la source de gaz constitué par un caisson 10 rapporté sur la lingotière. Dans ce type de configuration, la perte de charge principale de l'écoulement du gaz injecté se situe au niveau de la fente de balayage (8) et est étroitement liée à la géométrie de celle-ci, et plus particulièrement à l'épaisseur de la fente. Au cas où les surfaces en regard l'une de l'autre (la face supérieure du corps métallique refroidi (1 ) de la lingotière et la face inférieure de la rehausse réfractaire (2) ne seraient pas rigoureusement parallèles, une variation locale de l'épaisseur de fente conduit alors à un débit d'injection d'argon hétérogène sur le pourtour de la lingotière et donc à des défauts superficiels possibles sur le produit coulé. De tels écarts de parallélisme des deux surfaces en vis-à-vis apparaissent en particulier lorsque le périmètre, ou la section, du produit coulé est grand (gros "blooms" ou brames) et que des phénomènes de dilatation thermique différentielle entre les différents matériaux en présence interviennent, et plus particulièrement au voisinage des angles de la lingotière (ce qui est pratiquement toujours le cas après quelques minutes de coulée).The present invention relates to the Continuous Casting in Vertical Load of metals, in particular steel. It is known that Continuous Vertical Load Casting is essentially distinguished from Classic Vertical Continuous Casting by the fact that the cooled ingot mold body (generally made of copper or copper alloy) ensuring the peripheral solidification of the cast metal, is overcome by a extension in refractory material containing a reserve of molten metal maintained in the liquid state (FR-A-2 000 365). In this way, the place in the copper body where the solidification of the cast metal begins is decoupled from that where the free surface of the molten metal in the riser is located, whereas they are almost confused in Vertical Continuous Casting Classic. The aim is thus to be able to flow good quality products with high extraction speeds, because the solidification zone is no longer disturbed by the usual turbulence in the flow of metal arriving in the mold, which is then confined in the buffer volume. within the enhancement. It is also known to carry out a sweeping with inert gas, of argon for example, by injection of waste gas at the interface between the body of the mold and the extension. Such an arrangement is, for example, described in Patent Application EP-A-620,062 in the name of the Applicant. This sweeping is intended to break the slightly homogeneous parasitic solidification veil which tends to form by contact of the molten metal with the wall of the refractory riser. In this way, favorable conditions are created for starting a frank and regular solidification of the cast metal always at the same place of the ingot mold, namely at the level of the upper edge of the metallic body cooled to the limit of the enhancement. The aforementioned document describes an injection technology shown in Figure 1 attached. Essentially, it is an annular slot (8), continuous, or segmented, opening at the inner periphery of the mold. The scanning slit (8) is traversed by a stream of argon lost from an annular distribution chamber (1 3) formed in the vicinity of the slit and making it possible to maintain an identical gas pressure at all points of the perimeter in said room. Tubes (12) with low pressure drop connect this chamber (1 5) to the gas source constituted by a box 10 attached to the ingot mold. In this type of configuration, the main pressure drop of the flow of the injected gas is located at the level of the scanning slot (8) and is closely linked to the geometry thereof, and more particularly to the thickness of slot. If the surfaces facing each other (the upper face of the cooled metal body (1) of the ingot mold and the lower face of the refractory extension (2) are not strictly parallel, a local variation of the the slit thickness then leads to a heterogeneous argon injection flow rate around the periphery of the mold and therefore to possible surface defects on the cast product. Such deviations in parallelism of the two facing surfaces appear in particularly when the perimeter, or section, of the cast product is large (large "blooms" or slabs) and when differential thermal expansion phenomena between the different materials present occur, and more particularly in the vicinity of the angles of the mold (this which is almost always the case after a few minutes of casting).
Le but de la présente invention est d'assurer un débit d'injection de gaz à balayage régulier et constant sur tout le périmètre de la lingotière tout au long de l'opération de coulée.The object of the present invention is to ensure a gas injection rate with regular and constant sweeping over the entire perimeter of the mold throughout the casting operation.
A cet effet, l'invention a pour objet une lingotière de Coulée Continue en Charge Verticale des métaux, notamment de l'acier, constituée par un corps métallique refroidi définissant un passage pour le produit coulé et surmonté par une rehausse en matériau réfractaire, et à l'interface desquels est ménagée une fente de balayage par laquelle un courant de gaz inerte perdu est injecté selon le pourtour intérieur de la lingotière, à partir d'une chambre de distribution ménagée au voisinage de la fente, et alimentée elle-même en gaz par des tubulures qui la relient à une source de gaz sous pression, lingotière caractérisée en ce que la fente de balayage est segmentée selon le pourtour de la lingotière à l'aide de moyens de séparation qui segmentent également ladite chambre de distribution en compartiments contigûs selon le pourtour de la lingotière, et en ce que des tubulures d'admission calibrées sont prévues au niveau de chaque compartiment ainsi formé pour le relier à la source de gaz sous pression.To this end, the subject of the invention is a mold for continuous casting in vertical load of metals, in particular steel, constituted by a cooled metallic body defining a passage for the cast product and surmounted by an extension made of refractory material, and at the interface of which a sweeping slot is formed by which a stream of lost inert gas is injected along the inside periphery of the ingot mold, from a distribution chamber formed in the vicinity of the slot, and itself supplied with gas by pipes which connect it to a source of gas under pressure, an ingot mold characterized in that the scanning slot is segmented around the periphery of the ingot mold by means of separation means which also segment said distribution chamber into contiguous compartments along the periphery of the mold, and in that calibrated intake pipes are provided at each compartment thus formed p or connect it to the source of pressurized gas.
Comme on le comprend, l'invention consiste donc essentiellement à servir en courant de gaz de balayage une fente d'injection non continue sur le pourtour de la lingotière par une chambre qui la longe, elle-même segmentée en compartiments indépendants selon ce pourtour. De cette manière, on réalise, depuis la source de gaz sous pression, une pluralité de circuits d'injection autonomes, montés en parallèle et comportant chacun" : une tubulure d'admission calibrée débouchant dans un compartiment prolongé par une fente de balayage desservant en gaz une portion seulement du pourtour de la lingotière, la juxtaposition de ces fentes selon leur longueur assurant la distribution en gaz selon tout le périmètre intérieur de la lingotière.As can be understood, the invention therefore essentially consists in serving as a stream of sweeping gas a non-continuous injection slot around the periphery of the ingot mold by a chamber which runs along it, itself segmented into independent compartments along this periphery. In this way, a plurality of autonomous injection circuits, mounted in parallel and each comprising " : a calibrated intake manifold opening into a compartment extended by a scanning slot serving in gas only a portion of the periphery of the ingot mold, the juxtaposition of these slots according to their length ensuring gas distribution along the entire internal perimeter of the mold.
De préférence, la longueur de fente coïncide avec celle du compartiment associé.Preferably, the length of the slot coincides with that of the associated compartment.
Ainsi, toute perturbation du flux de gaz dans un circuit quelconque due à une cause externe, par exemple le rétrécissement accidentel d'une fente de balayage, n'influe nullement sur le débit dans les circuits voisins. Globalement, le périmètre d'injection selon le pourtour de la lingotière devient donc ainsi peu sensible aux défaillances locales, contrairement à l'art antérieur où une anomalie ponctuelle de la fente de balayage peut conduire à dégrader les caractéristiques d'écoulement du gaz sur une partie du pourtour sensiblement plus grande que celle concernée directement par l'incident.Thus, any disturbance of the gas flow in any circuit due to an external cause, for example the accidental narrowing of a scanning slot, has no influence on the flow rate in the neighboring circuits. Overall, the injection perimeter around the periphery of the ingot mold thus becomes not very sensitive to local failures, unlike the prior art where a punctual anomaly of the scanning slot can lead to degrading the gas flow characteristics over a part of the periphery significantly larger than that directly affected by the incident.
L'invention sera bien comprise et d'autres aspects et avantages apparaîtront plus clairement au vu des planches de dessins annexées sur lesquelles :The invention will be well understood and other aspects and advantages will appear more clearly in the light of the accompanying drawing plates in which:
- la figure 1 représente, en coupe verticale, la partie supérieure d'une lingotière de Coulée Continue en Charge Verticale pourvue d'un circuit d'injection de gaz selon l'Art Antérieur déjà évoqué ;- Figure 1 shows, in vertical section, the upper part of a mold for Continuous Casting under Vertical Load provided with a gas injection circuit according to the Prior Art already mentioned;
- la figure 2 représente, également en coupe verticale selon le plan B-B' de la figure 3, une vue agrandie du circuit d'injection de gaz dont est pourvue la partie supérieure d'une lingotière de Coulée Continue en Charge Verticale conforme à l'invention ;- Figure 2 shows, also in vertical section along the plane BB 'of Figure 3, an enlarged view of the gas injection circuit which is provided with the upper part of a mold for Continuous Casting in Vertical Charge according to invention;
- la figure 3 représente le circuit d'injection vu selon le plan de coupe A-A' de la figure 1 . Sur les figures, les mêmes éléments sont désignés par des références identiques.- Figure 3 shows the injection circuit seen along the cutting plane A-A 'of Figure 1. In the figures, the same elements are designated by identical references.
On commentera schématiquement la figure 1 uniquement pour situer l'invention dans son contexte. L'Homme de Métier pourra, s'il le souhaite, trouver une description plus détaillée de la constitution complète d'une lingotière de Coulée Continue en Charge Verticale en se reportant, par exemple, aux Documents EP-A-620 052 ou FR-A- 2 000 365 mentionnés au début. Sur cette figure, on voit en 1 , la partie supérieure du corps métallique refroidi de la lingotière, constitué, ici, par un élément tubulaire en alliage de cuivre énergiquement refroidi par une circulation d 'eau sur sa face extérieure 1 6, alors que sa face intérieure 17 définit un espace de coulée dans lequel de l'acier en fusion 4 se solidifie au contact de la paroi froide 1 7 en formant une croûte 1 5. Cette croûte 1 5 forme une enveloppe qui va croître vers l'intérieur à mesure que le métal coulé est extrait vers le bas de la lingotière, et ce, jusqu'à solidification complète du produit sous l'effet des rampes d'aspersion d'eau dont est équipée la machine de coulée en aval de la lingotière.We will schematically comment on Figure 1 only to place the invention in context. Those skilled in the art can, if they wish, find a more detailed description of the complete constitution of a continuous casting ingot mold with vertical load by referring, for example, to documents EP-A-620 052 or FR- A- 2000 365 mentioned at the beginning. In this figure, we see in 1, the upper part of the cooled metal body of the ingot mold, constituted, here, by a tubular element of copper alloy energetically cooled by a circulation of water on its external face 1 6, while its inner face 17 defines a pouring space in which molten steel 4 solidifies on contact with the cold wall 1 7 by forming a crust 1 5. This crust 1 5 forms an envelope which will grow inwards as that the cast metal is extracted towards the bottom of the mold, and this, until complete solidification of the product under the effect of the water spraying ramps with which the casting machine is equipped downstream of the mold.
Le métal en fusion est introduit en lingotière, avec un débit ajusté à celui avec lequel le métal coulé en sort, à l'aide d'une busette en réfractaire 5 débouchant dans le fond d'un répartiteur de coulée, non représenté, placé au dessus. La busette est pourvue à sa partie basse d'ouïes latérales 6 par lesquelles s'écoule le métal en fusion dans la lingotière. En cours de coulée, le contrôle du débit de "métal" permet de maintenir la surface libre 7 du métal en fusion à un niveau en hauteur maîtrisé à une dizaine de centimètres au-dessus des ouïes 6 (compte tenu des fluctuations dues à l'oscillation verticale de la lingotière). Comme on le comprend, cette partie supérieure du métal coulé (15-The molten metal is introduced into an ingot mold, with a flow rate adjusted to that with which the cast metal comes out of it, using a refractory nozzle 5 opening into the bottom of a casting distributor, not shown, placed at the above. The nozzle is provided at its lower part with lateral openings 6 through which the molten metal flows into the ingot mold. During casting, the control of the flow rate of "metal" keeps the free surface 7 of the molten metal at a controlled height level about ten centimeters above the openings 6 (taking into account the fluctuations due to the vertical oscillation of the mold). As can be understood, this upper part of the cast metal (15-
20 cm sous le ménisque) est en fait une réserve de métal en fusion contenue, non pas dans le corps en cuivre 1 6, mais dans une rehausse 2 en matériau réfractaire placée sur l'élément 16 et de préférence dans l'alignement avec la paroi intérieure 17 de celui-ci. C'est cette particularité qui constitue la caractéristique principale d'une Coulée en Charge selon l'invention. En effet, les turbulences inévitables dont est le siège le volume de métal coulé dans l'environnement des ouïes de sortie 6 sont ainsi confinées dans la partie de l'espace de coulée défini par la rehausse. De la sorte, la solidification du métal contre la paroi en cuivre refroidi 1 7 débute et croît dans des conditions hydrodynamiques très favorables, car l'écoulement du métal y est de type "écoulement piston" (pas de gradient sensible de vitesse dans la section du produit).20 cm below the meniscus) is in fact a reserve of molten metal contained, not in the copper body 1 6, but in an extension 2 of refractory material placed on the element 16 and preferably in alignment with the inner wall 17 thereof. It is this particularity which constitutes the main characteristic of a Load Casting according to the invention. Indeed, the inevitable turbulence which is the seat of the volume of metal cast in the environment of the outlet gills 6 are thus confined in the part of the casting space defined by the riser. In this way, the solidification of the metal against the wall of cooled copper 1 7 begins and increases under very favorable hydrodynamic conditions, because the flow of metal there is of the "piston flow" type (no significant velocity gradient in the section of the product).
Un courant de gaz de balayage inerte (de l'argon) est toutefois conseillé sur le pourtour intérieur de la lingotière juste au-dessus de l'arête supérieure de l'élément en cuivre où s'initie la solidification. Ce courant de balayage permet un démarrage franc et régulier du processus de solidification en brisant le voile de solidification parasite qui peut se former 37792 5 PC17FR97/00546A current of inert sweeping gas (argon) is however advised on the inside periphery of the ingot mold just above the upper edge of the copper element where solidification is initiated. This sweeping current allows a solid and regular start of the solidification process by breaking the parasitic solidification veil that can form 37792 5 PC17FR97 / 00546
de façon aléatoire et irrégulière contre la paroi réfractaire de la rehaussée et dont des fragments sont illustrés sous la référence 14.randomly and irregularly against the refractory wall of the raised and fragments of which are illustrated under reference 14.
Comme on le voit, ce courant de balayage est réalisé par un circuit d'alimentation comprenant, depuis une source de pression d'argon 10, des tubulures calibrées 12 reliant cette source à une chambre interne 13 de distribution parcourant le pourtour de la lingotière et de laquelle part une fente 8 débouchant dans la lingotière entre la rehausse 2 et le corps au centre 1 .As can be seen, this scanning current is produced by a supply circuit comprising, from an argon pressure source 10, calibrated pipes 12 connecting this source to an internal distribution chamber 13 traversing the periphery of the ingot mold and from which a slot 8 opens out into the mold between the extension 2 and the body at the center 1.
Dans l'exemple de réalisation montré sur la figure, cette fente est ménagée entre les deux éléments précités grâce à une cale-entretoise calibrée 19 insérée à la périphérie de l'élément en cuivre 1 .In the embodiment shown in the figure, this slot is made between the two aforementioned elements by means of a calibrated spacer spacer 19 inserted at the periphery of the copper element 1.
En se référant à présent aux figures 2 et 3, on voit que, conformément à l'invention, la solution proposée aux problèmes que pose le circuit de balayage ci-avant à la régularité de distribution du débit de sortie du gaz selon le pourtour intérieur de la lingotière consiste :Referring now to FIGS. 2 and 3, it can be seen that, in accordance with the invention, the solution proposed to the problems posed by the above-mentioned scanning circuit for the regularity of distribution of the gas outlet flow rate according to the inner periphery of the mold consists of:
- à reprendre la configuration en deux chambres en cascade,- to resume the configuration in two cascading rooms,
- et à sectorialiser la seconde chambre en compartiments juxtaposés selon le pourtour de la lingotière, de même que la fente de balayage associée à cette chambre. Une première chambre 20 sert à contenir un volume d'argon sous une pression donnée. Les tubulures calibrées 12 relient cette chambre à la seconde chambre 13 dont le rôle, on l'a vu, est de distribuer le gaz dans la fente de balayage 8 qui débouche à la surface intérieure 17 de la lingotière 1 selon le pourtour de celle-ci. La fente de balayage 8 est fractionnée en secteurs juxtaposés, séparés entre eux par des cloisons 21 qui partagent de la même manière la seconde chambre de distribution 13 en compartiments 1 3'-13"... juxtaposés selon le pourtour de la lingotière et en coïncidence avec la partition de la fente. A cette fin, chaque cloison 21 comprend une partie avancée 21 a de faible hauteur, correspondant à l'épaisseur de la fente 8 dans laquelle elle prend position, et une partie-mère 21 b dont la surface correspond à la section de la chambre 13 à cloisonner.- And to sectorize the second chamber into juxtaposed compartments around the periphery of the mold, as well as the scanning slot associated with this chamber. A first chamber 20 serves to contain a volume of argon under a given pressure. The calibrated pipes 12 connect this chamber to the second chamber 13 whose role, as we have seen, is to distribute the gas in the scanning slot 8 which opens to the interior surface 17 of the ingot mold 1 around the periphery thereof. this. The scanning slot 8 is divided into juxtaposed sectors, separated from each other by partitions 21 which in the same way share the second distribution chamber 13 in compartments 1 3'-13 "... juxtaposed along the periphery of the ingot mold and in Coincidence with the partition of the slot. To this end, each partition 21 comprises an advanced part 21 a of low height, corresponding to the thickness of the slot 8 in which it takes position, and a mother part 21 b whose surface corresponds to the section of the chamber 13 to be partitioned.
Chaque cloison 21 est de préférence une pièce usinée puis rapportée, par soudure par exemple, dans la chambre 13 entre deux arrivées des tubulures calibrées 12'- 12" .Each partition 21 is preferably a machined part then added, by welding for example, in the chamber 13 between two arrivals of the calibrated pipes 12'- 12 ".
On réalise ainsi une pluralité de circuits autonomes de distribution du gaz en lingotière montés "en parallèle" sur la nourrice unique représentée par la chambre de pression 20, et composé chacun, d'un compartiment 13', prolongé en aval par un secteur 8' de fente 8 et alimenté par une tubulure 12' calibrée, piquée sur la chambre générale 20. Celle-ci est dimensionnée pour assurer une homogénéité de pression du gaz sur le pourtour de la lingotière. Quant à la chambre intermédiaire 13, sa segmentation en compartiments individuels 13'-13"..., associés chacun à un secteur particulier 8'-8"... de la fente 8, procure une homogénéité d'injection du gaz dans chaque circuit unitaire 12'-13'-8' ainsi formé.This produces a plurality of independent gas distribution circuits in the mold mounted "in parallel" on the single manifold represented by the pressure chamber 20, and each composed of a compartment 13 ', extended downstream by a sector 8' of slot 8 and supplied by a tubing 12 'calibrated, pricked on the general chamber 20. The latter is dimensioned to ensure a homogeneity of gas pressure around the periphery of the mold. As for the intermediate chamber 13, its segmentation into individual compartments 13'-13 "..., each associated with a particular sector 8'-8" ... of the slot 8, provides uniformity in the injection of gas into each unitary circuit 12'-13'-8 'thus formed.
On constate que l'introduction de la segmentation conformément à l'invention permet de diviser dans un rapport de cinq, voire de huit, l'influence des variations locales d'épaisseur de la fente 8 sur le débit global de gaz injecté en lingotière. Autrement dit, en segmentant la partie "aval" du circuit d'injection conformément à l'invention, chaque circuit élémentaire ainsi constitué est alimenté de façon identique et constante par la chambre générale sous pression 20 et l'ensemble devient peu sensible aux variations locales d'épaisseur de fente, ou de façon plus générale, à toute perturbation localisée du circuit d'injection pour cause externe au circuit.It is noted that the introduction of segmentation in accordance with the invention makes it possible to divide in a ratio of five, or even eight, the influence of the local variations in thickness of the slot 8 on the overall flow rate of gas injected in the mold. In other words, by segmenting the "downstream" part of the injection circuit in accordance with the invention, each elementary circuit thus formed is supplied in an identical and constant manner by the general pressure chamber 20 and the assembly becomes not very sensitive to local variations slot thickness, or more generally, any localized disturbance of the injection circuit for reasons external to the circuit.
Il devient ainsi possible d'injecter du gaz sur une grande longueur de pourtour de lingotière (plusieurs mètres de long) et de façon homogène tout du long. Ce résultat montre l'intérêt que l'on peut trouver dans l'application de l'invention à la Coulée Continue des grands formats (brames ou "blooms") en particulier.It thus becomes possible to inject gas over a long length of periphery of the mold (several meters long) and in a homogeneous way all along. This result shows the advantage which can be found in the application of the invention to the continuous casting of large formats (slabs or "blooms") in particular.
Il va de soi que l'invention n'est pas limitée à l'exemple décrit mais s'étend à de multiples variantes ou équivalents dans la mesure où est respectée sa définition donnée par les revendications jointes.It goes without saying that the invention is not limited to the example described but extends to multiple variants or equivalents insofar as its definition given by the appended claims is respected.
En particulier, les tubulures calibrées 12 peuvent, elles aussi, être conformées en fente.In particular, the calibrated tubes 12 can also be shaped into a slit.
De même, la chambre intermédiaire 13 peut être indifféremment ménagée dans la rehausse réfractaire 2 (fig. 1 ) ou dans l'élément en cuivre 1 (fig. 2 et 3). Bien entendu, il sera souhaitable d'étanchéifier les circuits et chambres qui sont ménagées dans la partie réfractaire.Likewise, the intermediate chamber 13 can be indifferently formed in the refractory riser 2 (fig. 1) or in the copper element 1 (fig. 2 and 3). Of course, it will be desirable to seal the circuits and chambers which are formed in the refractory part.
Quant aux cloisons 21 , qui fractionnent à la fois la fente 8 et la chambre 13, il est bien entendu que tout autre moyen que celui décrit, remplissant cette double fonction pourra convenir, comme des plaquettes (équivalant 21 b) de partiellisation de la chambre 13, associées à des nervures (équiv. 21 a) ménagées sur la face supérieure de l'élément en cuivre et coopérant avec la partie réfractaire au-dessus pour définir les fentes, sachant que l'ordre de grandeur de l'épaisseur de la fente de balayage peut être de 0.1 -0.3 mm environ. As for the partitions 21, which divide both the slot 8 and the chamber 13, it is understood that any other means than that described, fulfilling this double function may be suitable, like plates (equivalent 21 b) for partialization of the chamber 13, associated with ribs (equiv. 21 a) formed on the upper face of the copper element and cooperating with the refractory part above to define the slots, knowing that the order of magnitude of the thickness e of scanning slit can be about 0.1 -0.3 mm.
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9604306 | 1996-04-05 | ||
| FR9604306A FR2747063B1 (en) | 1996-04-05 | 1996-04-05 | CONTINUOUS CASTING LINGOTIERE IN VERTICAL METAL LOAD |
| PCT/FR1997/000546 WO1997037792A1 (en) | 1996-04-05 | 1997-03-27 | Ingot mould for the continuous vertical casting of metals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0891236A1 true EP0891236A1 (en) | 1999-01-20 |
| EP0891236B1 EP0891236B1 (en) | 2000-03-15 |
Family
ID=9490960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97916508A Expired - Lifetime EP0891236B1 (en) | 1996-04-05 | 1997-03-27 | Ingot mould for the continuous vertical casting of metals |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US6109335A (en) |
| EP (1) | EP0891236B1 (en) |
| JP (1) | JP3720376B2 (en) |
| AT (1) | ATE190530T1 (en) |
| AU (1) | AU2513397A (en) |
| CA (1) | CA2251020C (en) |
| DE (1) | DE69701454T2 (en) |
| ES (1) | ES2145594T3 (en) |
| FR (1) | FR2747063B1 (en) |
| GR (1) | GR3033481T3 (en) |
| PT (1) | PT891236E (en) |
| WO (1) | WO1997037792A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2787359B1 (en) * | 1998-12-18 | 2001-10-12 | Aster | PLURIANGULAR LINGOTIERE OF CONTINUOUS CASTING IN CHARGE OF A METALLURGICAL PRODUCT |
| DE102004033917B4 (en) * | 2004-07-14 | 2008-12-24 | Schott Ag | Apparatus and method for shaft casting of rod-shaped articles |
| US8393393B2 (en) | 2010-12-17 | 2013-03-12 | Halliburton Energy Services, Inc. | Coupler compliance tuning for mitigating shock produced by well perforating |
| US20120241169A1 (en) | 2011-03-22 | 2012-09-27 | Halliburton Energy Services, Inc. | Well tool assemblies with quick connectors and shock mitigating capabilities |
| US9091152B2 (en) | 2011-08-31 | 2015-07-28 | Halliburton Energy Services, Inc. | Perforating gun with internal shock mitigation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2000365A7 (en) * | 1968-01-18 | 1969-09-05 | United States Steel Corp | |
| CA1082875A (en) * | 1976-07-29 | 1980-08-05 | Ryota Mitamura | Process and apparatus for direct chill casting of metals |
| DE3533517A1 (en) * | 1985-09-20 | 1987-04-02 | Vaw Ver Aluminium Werke Ag | METHOD AND DEVICE FOR CONTINUOUS CASTING |
| DE4212531C1 (en) * | 1992-04-15 | 1993-10-21 | Vaw Ver Aluminium Werke Ag | Gas and release agent supply and distribution system for a continuous casting device |
| FR2703609B3 (en) * | 1993-03-30 | 1995-02-10 | Lorraine Laminage | Continuous casting process in charge of metals and ingot mold for its implementation. |
-
1996
- 1996-04-05 FR FR9604306A patent/FR2747063B1/en not_active Expired - Fee Related
-
1997
- 1997-03-27 ES ES97916508T patent/ES2145594T3/en not_active Expired - Lifetime
- 1997-03-27 EP EP97916508A patent/EP0891236B1/en not_active Expired - Lifetime
- 1997-03-27 AT AT97916508T patent/ATE190530T1/en active
- 1997-03-27 WO PCT/FR1997/000546 patent/WO1997037792A1/en active IP Right Grant
- 1997-03-27 JP JP53588497A patent/JP3720376B2/en not_active Expired - Fee Related
- 1997-03-27 CA CA002251020A patent/CA2251020C/en not_active Expired - Fee Related
- 1997-03-27 PT PT97916508T patent/PT891236E/en unknown
- 1997-03-27 US US09/147,028 patent/US6109335A/en not_active Expired - Lifetime
- 1997-03-27 DE DE69701454T patent/DE69701454T2/en not_active Expired - Lifetime
- 1997-03-27 AU AU25133/97A patent/AU2513397A/en not_active Abandoned
-
2000
- 2000-05-23 GR GR20000401178T patent/GR3033481T3/en unknown
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9737792A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2747063A1 (en) | 1997-10-10 |
| AU2513397A (en) | 1997-10-29 |
| WO1997037792A1 (en) | 1997-10-16 |
| PT891236E (en) | 2000-07-31 |
| GR3033481T3 (en) | 2000-09-29 |
| JP3720376B2 (en) | 2005-11-24 |
| CA2251020A1 (en) | 1997-10-16 |
| ES2145594T3 (en) | 2000-07-01 |
| DE69701454T2 (en) | 2000-10-12 |
| EP0891236B1 (en) | 2000-03-15 |
| CA2251020C (en) | 2005-01-04 |
| DE69701454D1 (en) | 2000-04-20 |
| FR2747063B1 (en) | 1998-05-22 |
| JP2000508241A (en) | 2000-07-04 |
| US6109335A (en) | 2000-08-29 |
| ATE190530T1 (en) | 2000-04-15 |
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