EP0515271A1 - Method and device for casting a hollow ingot using a controllable cooled core - Google Patents
Method and device for casting a hollow ingot using a controllable cooled core Download PDFInfo
- Publication number
- EP0515271A1 EP0515271A1 EP92401375A EP92401375A EP0515271A1 EP 0515271 A1 EP0515271 A1 EP 0515271A1 EP 92401375 A EP92401375 A EP 92401375A EP 92401375 A EP92401375 A EP 92401375A EP 0515271 A1 EP0515271 A1 EP 0515271A1
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- EP
- European Patent Office
- Prior art keywords
- mandrel
- ingot
- hollow
- flow
- central channel
- 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.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/04—Casting hollow ingots
Definitions
- the invention relates to a method of casting a metal hollow ingot allowing to improve and regulate the cooling of a hollow core used to form the central recess of the hollow ingot.
- the object of the invention is to make it possible to modulate significantly the efficiency of the cooling during the solidification of the ingot, which has the advantage of giving the means to adjust the position of the end of solidification front.
- the object of the invention is a method for casting an ingot of a metal hollow ingot, in particular steel, into a mold, in which the central recess of the hollow ingot is formed using a core placed in the mold and constituted by a cylindrical metal mandrel.
- hollow axially crossed by a central channel and an external tubular jacket placed in a coaxial arrangement around the mandrel delimiting a peripheral space around the mandrel and the core is cooled during the solidification of the ingot after pouring of liquid metal into the ingot mold by circulation of a coolant flow in the mandrel and in the peripheral space characterized in that the coolant flow cooling consists of a main flow of fluid circulated in the mandrel channel and by an additional flow of fluid injected into the main flow.
- the first and the second cooling stream consist of at least one gas.
- the gas is preferably air, nitrogen or carbon dioxide or a mixture of these gases.
- the additional flow comprises at least one zone in which the second fluid circulates in supersonic regime and in which a shock wave is formed.
- the fluid injected into the supersonic regime zone is preferably water.
- the flow rate of the injected fluid is adjustable.
- the invention also relates to a device for implementing the casting method according to the invention of the type comprising an ingot mold mounted on a base plate and a core comprising a hollow mandrel axially traversed by a central channel and an external jacket coaxial with the mandrel, arranged vertically in the ingot mold, in which a cooling fluid circulates;
- the device comprises a means for injecting an additional cooling fluid into the central channel of the mandrel, constituted by an axis fixed transversely in the mandrel, so as to pass through its central channel without completely closing it and comprising a hollow central part connected to a cooling fluid supply means and an opening communicating the hollow central part with the central channel of the mandrel.
- this opening forms a nozzle, the axis of which coincides with the longitudinal axis of the mandrel and which is oriented towards the lower part of the mandrel.
- This nozzle successively comprises from top to bottom a converging part, a neck and a diverging part.
- a supply of vaporizable fluid opens into the divergent part of the nozzle, upstream of the zone where a shock wave is likely to form.
- the device represented in FIG. 1 corresponds to the example of a source casting in which an ingot mold 1 is placed on a base plate 2 provided with a source 3 and a supply channel 4 opening out through the base plate 2 by tap holes 5.
- a core generally identified by 16 comprising a jacket 6 and a hollow mandrel 8 resting on the bottom 7 of the jacket 6, with interposition of discontinuous shims 9; a free space 13 is provided between the mandrel and the jacket.
- the mandrel 8 is provided at its upper part with a hollow handling pin 17 which will be described in detail below.
- a main flow of a first cooling fluid for example air, is introduced into the upper part of the mandrel and circulates from top to bottom in the central part of the latter, then comes out going up in space 13; this flow is provided by a fan not shown.
- An additional flow of a second coolant which may also be air is introduced by the handling axis and is added to the main flow circulating in the hollow part of the mandrel.
- the handling axis is cylindrical and passes through the mandrel perpendicular to the main axis of the latter. It also crosses the central channel 18 of the mandrel without, however, completely obstructing it.
- the handling axis 17 comprises, along its axis, a cylindrical hole 19 which, starting from one end extends to the part which is in the channel 18.
- the axis of handling 17 includes an opening 20 into which is inserted a nozzle 21 whose axis coincides with the axis of the channel 18 of the mandrel and which is oriented towards the lower part of the mandrel 8 and of the ingot mold 1.
- This nozzle 21 has a converging part 22, a neck 23 and a diverging part 24. In the diverging part, a fluid inlet 25 is provided.
- the hole 19 of the handling axis 17 is supplied, for example, with air. Passing through the convergent, this air arrives at the neck at a speed equal to the speed of sound and in the diverging part is accelerated to supersonic speeds. This forms the additional flow.
- Another advantage is the additional flow. Indeed, at the outlet of the nozzle, this flow creates an ejector effect so that, if the fan supplying the main flow breaks down, air is drawn into the hollow part of the mandrel and the cooling of the core can continue until the end of solidification.
- the ingot is poured at source and the core placed in the ingot mold before casting the steel.
- the steel can also be poured into the ingot mold first and the core can then be introduced into the molten metal 15.
- the ingot can be poured under vacuum.
- the cooling fluids taken as an example are air for the main flow and the additional flow and water for the injected fluid. But for the main and additional flows other gases are possible; for example nitrogen, or carbon dioxide. Other vaporizable fluids than water can also be injected into the additional flow.
- the device for supplying the additional flow is not necessarily a handling axis, it can be a device whose sole purpose is to introduce the additional flow.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
L'invention est relative à un procédé de coulée d'un lingot creux métallique permettant d'améliorer et de régler le refroidissement d'un noyau creux utilisé pour former l'évidement central du lingot creux.The invention relates to a method of casting a metal hollow ingot allowing to improve and regulate the cooling of a hollow core used to form the central recess of the hollow ingot.
La fabrication de lingots creux est bien connue. Elle a été décrite en particulier dans le brevet français FR 82-06475 et dans son certificat d'addition FR 83-04718. On utilise un noyau creux équipé d'un mandrin creux dans lequel on insuffle un fluide de refroidissement, par exemple de l'air. L'air est insufflé par un ventilateur. Cette façon de procéder présente l'inconvénient que le flux d'air n'est pas très facilement réglable. De plus, il est difficile d'injecter de la vapeur pour modifier l'efficacité du fluide de refroidissement. Dans ces conditions, on ne peut pas maîtriser avec précision la position du front de fin de solidification, donc la position exacte des ségrégations à l'intérieur du lingot.The manufacture of hollow ingots is well known. It has been described in particular in French patent FR 82-06475 and in its addition certificate FR 83-04718. A hollow core is used equipped with a hollow mandrel into which a cooling fluid, for example air, is injected. The air is blown in by a fan. This procedure has the disadvantage that the air flow is not very easily adjustable. In addition, it is difficult to inject steam to modify the efficiency of the coolant. Under these conditions, it is not possible to precisely control the position of the end of solidification front, therefore the exact position of the segregations inside the ingot.
Le but de l'invention est de permettre de moduler de façon importante l'efficacité du refroidissement pendant la solidification du lingot, ce qui a l'avantage de donner les moyens de régler la position du front de fin de solidification.The object of the invention is to make it possible to modulate significantly the efficiency of the cooling during the solidification of the ingot, which has the advantage of giving the means to adjust the position of the end of solidification front.
L'objet de l'invention est un procédé de coulée en lingotière d'un lingot creux métallique notamment en acier, dans lequel on forme l'évidement central du lingot creux en utilisant un noyau placé dans la lingotière et constitué par un mandrin métallique cylindrique creux traversé axialement par un canal central et une chemise tubulaire externe placée dans une disposition coaxiale autour du mandrin délimitant un espace périphérique autour du mandrin et on refroidit le noyau pendant la solidification du lingot après coulée de métal liquide dans la lingotière par circulation d'un courant de fluide de refroidissement dans le mandrin et dans l'espace périphérique caractérisé en ce que le courant de fluide de refroidissement est constitué par un flux principal de fluide mis en circulation dans le canal du mandrin et par un flux additionnel de fluide injecté dans le flux principal.The object of the invention is a method for casting an ingot of a metal hollow ingot, in particular steel, into a mold, in which the central recess of the hollow ingot is formed using a core placed in the mold and constituted by a cylindrical metal mandrel. hollow axially crossed by a central channel and an external tubular jacket placed in a coaxial arrangement around the mandrel delimiting a peripheral space around the mandrel and the core is cooled during the solidification of the ingot after pouring of liquid metal into the ingot mold by circulation of a coolant flow in the mandrel and in the peripheral space characterized in that the coolant flow cooling consists of a main flow of fluid circulated in the mandrel channel and by an additional flow of fluid injected into the main flow.
De manière préférentielle, le premier et le second flux de refroidissement sont constitués par au moins un gaz. Le gaz est de préférence de l'air, de l'azote ou du gaz carbonique ou un mélange de ces gaz.Preferably, the first and the second cooling stream consist of at least one gas. The gas is preferably air, nitrogen or carbon dioxide or a mixture of these gases.
Préférentiellement, le flux additionnel comporte au moins une zone dans laquelle le second fluide circule en régime supersonique et dans laquelle se forme une onde de choc.Preferably, the additional flow comprises at least one zone in which the second fluid circulates in supersonic regime and in which a shock wave is formed.
Lorsqu'il se produit un écoulement en régime supersonique, on injecte un fluide susceptible de se vaporiser, dans la zone en régime supersonique du courant additionnel.When a flow occurs in supersonic regime, a fluid capable of vaporization is injected into the zone in supersonic regime of the additional current.
Le fluide injecté dans la zone de régime supersonique est de préférence del'eau.The fluid injected into the supersonic regime zone is preferably water.
Le débit du fluide injecté est réglable.The flow rate of the injected fluid is adjustable.
L'invention a également pour objet un dispositif pour la mise en oeuvre du procédé de coulée selon l'invention du type comprenant une lingotière montée sur une plaque de base et un noyau comportant un mandrin creux traversé axialement par un canal central et une chemise externe coaxiale au mandrin, disposé verticalement dans la lingotière, dans lequel circule un fluide de refroidissement ; le dispositif comporte un moyen d'injection d'un fluide de refroidissement additionnel dans le canal central du mandrin, constitué par un axe fixé transversalement dans le mandrin, de manière à traverser son canal central sans l'obturer complètement et comportant une partie centrale creuse reliée à un moyen d'alimentation en fluide de refroidissement et une ouverture mettant en communication la partie centrale creuse avec le canal central du mandrin.The invention also relates to a device for implementing the casting method according to the invention of the type comprising an ingot mold mounted on a base plate and a core comprising a hollow mandrel axially traversed by a central channel and an external jacket coaxial with the mandrel, arranged vertically in the ingot mold, in which a cooling fluid circulates; the device comprises a means for injecting an additional cooling fluid into the central channel of the mandrel, constituted by an axis fixed transversely in the mandrel, so as to pass through its central channel without completely closing it and comprising a hollow central part connected to a cooling fluid supply means and an opening communicating the hollow central part with the central channel of the mandrel.
De préférence, cette ouverture forme une tuyère dont l'axe est confondu avec l'axe longitudinal du mandrin et qui est orientée vers la partie inférieure du mandrin. Cette tuyère comporte successivement de haut en bas une partie convergente, un col et une partie divergente.Preferably, this opening forms a nozzle, the axis of which coincides with the longitudinal axis of the mandrel and which is oriented towards the lower part of the mandrel. This nozzle successively comprises from top to bottom a converging part, a neck and a diverging part.
Une alimentation en fluide vaporisable débouche dans la partie divergente de la tuyère, en amont de la zone où une onde de choc est susceptible de se former.A supply of vaporizable fluid opens into the divergent part of the nozzle, upstream of the zone where a shock wave is likely to form.
L'invention va maintenant être décrite en regard des figures annexées dans lesquelles :
- la figure 1 représente un schéma d'ensemble d'un dispositif de fabrication de lingot creux,
- la figure 2 représente une vue partielle éclatée du dispositif selon l'invention et montrant une tuyère.
- FIG. 1 represents an overall diagram of a device for manufacturing a hollow ingot,
- 2 shows a partial exploded view of the device according to the invention and showing a nozzle.
Le dispositif représenté à la figure 1 correspond à l'exemple d'une coulée en source dans lequel une lingotière 1 est placée sur une plaque de base 2 munie d'une source 3 et d'un canal d'alimentation 4 débouchant à travers la plaque de base 2 par des trous de coulée 5. Dans cette lingotière 1 est placé un noyau repéré généralement par 16 comportant une chemise 6 et un mandrin creux 8 reposant sur le fond 7 de la chemise 6, avec interposition de cales discontinues 9 ; un espace libre 13 est ménagé entre le mandrin et la chemise.The device represented in FIG. 1 corresponds to the example of a source casting in which an ingot mold 1 is placed on a
Le mandrin 8 est muni à sa partie supérieure d'un axe de manutention creux 17 qui sera décrit en détail plus loin. Un flux principal d'un premier fluide de refroidissement, par exemple de l'air est introduit dans la partie supérieure du mandrin et circule du haut vers le bas dans la partie centrale de celui-ci puis ressort en remontant dans l'espace 13 ; ce flux est fourni par un ventilateur non représenté.The
Un flux additionnel d'un second fluide de refroidissement qui peut être également de l'air est introduit par l'axe de manutention et vient s'ajouter au flux principal circulant dans la partie creuse du mandrin.An additional flow of a second coolant which may also be air is introduced by the handling axis and is added to the main flow circulating in the hollow part of the mandrel.
L'axe de manutention, représenté partiellement à la figure 2, est cylindrique et traverse le mandrin perpendiculairement à l'axe principal de ce dernier. Il traverse également le canal central 18 du mandrin sans toutefois l'obstruer complètement. L'axe de manutention 17 comporte, suivant son axe, un trou cylindrique 19 qui, partant d'une extrémité se prolonge jusqu'à la partie qui se trouve dans le canal 18. Dans la direction axiale du canal 18, l'axe de manutention 17 comporte une ouverture 20 dans laquelle est insérée une tuyère 21 dont l'axe est confondu avec l'axe du canal 18 du mandrin et qui est orientée vers la partie inférieure du mandrin 8 et de la lingotière 1. Cette tuyère 21 comporte une partie convergente 22,un col 23 et une partie divergente 24. Dans la partie divergente, une arrivée de fluide 25 est prévue.The handling axis, partially shown in Figure 2, is cylindrical and passes through the mandrel perpendicular to the main axis of the latter. It also crosses the
Le trou 19 de l'axe de manutention 17 est alimenté par exemple par de l'air. En passant par le convergent, cet air arrive au col à une vitesse égale à la vitesse du son et dans la partie divergente est accéléré jusqu'à des vitesses supersoniques. Ceci forme le flux additionnel.The
Lorsque le flux additionnel se mélange au flux principal introduit au sommet du mandrin, l'air est ralenti, la pression s'élève et il se forme dans le divergent une onde de choc qui se trouve en aval de l'alimentation 25 en fluide. Par l'alimentation 25 en fluide on introduit de l'eau. L'eau est entraînée par le flux additionnel et à la traversée de l'onde de choc, cette eau est vaporisée.When the additional flow mixes with the main flow introduced at the top of the mandrel, the air is slowed down, the pressure rises and a shock wave is formed in the divergent which is located downstream of the fluid supply. By the
En modulant le débit d'eau injecté, on peut faire varier la quantité de vapeur contenue dans le flux résultant de fluide de refroidissement et ainsi ajuster à volonté la capacité d'extraction de chaleur de ce flux. Il est alors possible de faire varier la vitesse de solidification le long de la paroi de la chemise et, en l'accélérant ou en la ralentissant de régler la position du front de fin de solidification.By modulating the flow rate of water injected, it is possible to vary the quantity of vapor contained in the flow resulting from the cooling fluid and thus adjust at will the heat extraction capacity of this flow. he it is then possible to vary the solidification speed along the wall of the jacket and, by accelerating or slowing it down, adjust the position of the end of solidification front.
Le flux additionnel présente un autre avantage. En effet, à la sortie de la tuyère, ce flux crée un effet d'éjecteur si bien que, si le ventilateur alimentant le flux principal tombe en panne, de l'air est aspiré dans la partie creuse du mandrin et le refroidissement du noyau peut se poursuivre jusqu'à la fin de la solidification.Another advantage is the additional flow. Indeed, at the outlet of the nozzle, this flow creates an ejector effect so that, if the fan supplying the main flow breaks down, air is drawn into the hollow part of the mandrel and the cooling of the core can continue until the end of solidification.
Dans l'exemple décrit, le lingot est coulé en source et le noyau placé dans la lingotière avant coulée de l'acier. Mais l'acier peut également être coulé dans la lingotière en premier et le noyau être introduit ensuite dans le métal liquide 15. Le lingot peut être coulé sous vide.In the example described, the ingot is poured at source and the core placed in the ingot mold before casting the steel. However, the steel can also be poured into the ingot mold first and the core can then be introduced into the
Les fluides de refroidissement pris en exemple sont de l'air pour le flux principal et le flux additionnel et de l'eau pour le fluide injecté. Mais pour les flux principal et additionel d'autres gaz sont possibles ; par exemple de l'azote, ou du gaz carbonique. D'autres fluides vaporisables que l'eau peuvent également être injectés dans le flux additionnel. Enfin, le dispositif d'apport du flux additionnel n'est pas nécessairement un axe de manutention, ce peut être un dispositif ayant pour seul objet d'introduire le flux additionnel.The cooling fluids taken as an example are air for the main flow and the additional flow and water for the injected fluid. But for the main and additional flows other gases are possible; for example nitrogen, or carbon dioxide. Other vaporizable fluids than water can also be injected into the additional flow. Finally, the device for supplying the additional flow is not necessarily a handling axis, it can be a device whose sole purpose is to introduce the additional flow.
Claims (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9106223A FR2676671B1 (en) | 1991-05-23 | 1991-05-23 | METHOD AND DEVICE FOR CASTING A HOLLOW LINGOT USING AN ADJUSTABLE COOLED CORE. |
FR9106223 | 1991-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0515271A1 true EP0515271A1 (en) | 1992-11-25 |
Family
ID=9413052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92401375A Withdrawn EP0515271A1 (en) | 1991-05-23 | 1992-05-20 | Method and device for casting a hollow ingot using a controllable cooled core |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0515271A1 (en) |
JP (1) | JPH0655244A (en) |
FR (1) | FR2676671B1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102935493A (en) * | 2012-11-20 | 2013-02-20 | 天津重型装备工程研究有限公司 | Method for manufacturing large hollow steel ingots by forced cooling with single sleeves |
CN111136227A (en) * | 2020-02-12 | 2020-05-12 | 山东宝鼎重工实业有限公司 | Cooling process for eliminating steel ingot banded structure |
CN112371927A (en) * | 2020-11-09 | 2021-02-19 | 陈德钦 | Steel pipe casting mold and casting method |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2490842B1 (en) * | 2009-10-21 | 2013-12-11 | Arcelormittal Investigacion y Desarrollo, S.L. | Method for manufacturing a metal ingot comprising a bore, and associated ingot and molding device |
FR2958194B1 (en) | 2010-04-02 | 2012-06-15 | Creusot Forge | METHOD AND DEVICE FOR THE MANUFACTURE OF A BI-MATERIAL VIROLE, AND VIROLE SO REALIZED |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB908832A (en) * | 1958-01-22 | 1962-10-24 | Mannesmann Ag | Casting apparatus |
EP0246040A2 (en) * | 1986-05-15 | 1987-11-19 | Kawasaki Steel Corporation | Method and apparatus for producing hollow metal ingots |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5788947A (en) * | 1980-11-21 | 1982-06-03 | Kawasaki Steel Corp | Casting method for thin-walled hollow steel ingot for pipe making |
JPS61276744A (en) * | 1985-06-01 | 1986-12-06 | Kawasaki Steel Corp | Method and apparatus for producing hollow steel ingot |
-
1991
- 1991-05-23 FR FR9106223A patent/FR2676671B1/en not_active Expired - Fee Related
-
1992
- 1992-05-20 EP EP92401375A patent/EP0515271A1/en not_active Withdrawn
- 1992-05-25 JP JP13228692A patent/JPH0655244A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB908832A (en) * | 1958-01-22 | 1962-10-24 | Mannesmann Ag | Casting apparatus |
EP0246040A2 (en) * | 1986-05-15 | 1987-11-19 | Kawasaki Steel Corporation | Method and apparatus for producing hollow metal ingots |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 11, no. 140 (M-586)(2587) 8 Mai 1987 & JP-A-61 276 744 ( KAWASAKI STEEL CORP. ) 6 Décembre 1986 * |
PATENT ABSTRACTS OF JAPAN vol. 6, no. 181 (M-156)(1059) 17 Septembre 1982 & JP-A-57 088 947 ( KAWASAKI SEITETSU K.K. ) 3 Juin 1982 * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102935493A (en) * | 2012-11-20 | 2013-02-20 | 天津重型装备工程研究有限公司 | Method for manufacturing large hollow steel ingots by forced cooling with single sleeves |
CN111136227A (en) * | 2020-02-12 | 2020-05-12 | 山东宝鼎重工实业有限公司 | Cooling process for eliminating steel ingot banded structure |
CN111136227B (en) * | 2020-02-12 | 2021-07-23 | 山东宝鼎重工实业有限公司 | Cooling process for eliminating steel ingot banded structure |
CN112371927A (en) * | 2020-11-09 | 2021-02-19 | 陈德钦 | Steel pipe casting mold and casting method |
Also Published As
Publication number | Publication date |
---|---|
JPH0655244A (en) | 1994-03-01 |
FR2676671B1 (en) | 1994-01-14 |
FR2676671A1 (en) | 1992-11-27 |
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