EP0203979B1 - Improvements to molten metal ladles - Google Patents

Improvements to molten metal ladles Download PDF

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Publication number
EP0203979B1
EP0203979B1 EP86900091A EP86900091A EP0203979B1 EP 0203979 B1 EP0203979 B1 EP 0203979B1 EP 86900091 A EP86900091 A EP 86900091A EP 86900091 A EP86900091 A EP 86900091A EP 0203979 B1 EP0203979 B1 EP 0203979B1
Authority
EP
European Patent Office
Prior art keywords
ring
shaped
chamber
wall
cooling
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.)
Expired
Application number
EP86900091A
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German (de)
French (fr)
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EP0203979A1 (en
Inventor
René Desaar
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.)
Individual
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Individual
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Publication date
Priority claimed from BE0/214046A external-priority patent/BE901117A/en
Application filed by Individual filed Critical Individual
Priority to AT86900091T priority Critical patent/ATE34107T1/en
Publication of EP0203979A1 publication Critical patent/EP0203979A1/en
Application granted granted Critical
Publication of EP0203979B1 publication Critical patent/EP0203979B1/en
Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means

Definitions

  • the present invention relates to ladles for molten metal, for example steel, and more particularly to an improvement for cooling the pocket bottom brick of these ladles during their use.
  • the pocket bottom bricks are refractory bricks which line the wall of the pouring channel with the ladles.
  • the contact of air with the refractory brick during casting somewhat erodes the brick.
  • the ladle is returned to maintenance, the pouring channel is still filled with steel which is largely solidified. It is then necessary to burn this steel core using an oxygen lance so as to clean the wall of the pocket bottom brick.
  • the brick is damaged the most strongly because the burner dart causes at the point of contact a very significant rise in temperature and consequently a deterioration of the interior surface.
  • the invention relates to an improvement aimed at allowing the continuous cooling of the pocket bottom brick during metal casting and during maintenance operations so as to protect the wall of this brick against too high a temperature and thus avoid its slow but steady erosion during metal casting and the deterioration of the wall of the pouring channel during maintenance operations.
  • a ladle characterized by an annular cooling chamber extending around the periphery of the pocket bottom brick, a hollow ring being arranged in the annular chamber so as to s extend practically coaxially to the pouring channel, the wall of this ring being pierced with holes distributed along the ring, the interior volume of the ring being in communication with a coolant supply pipe, the wall of the annular chamber having an opening for the evacuation of the cooling fluid distributed by the distributor ring in the annular chamber.
  • the annular cooling chamber can be formed in the pocket bottom brick or be formed by an external box surrounding at least part of the pocket bottom brick.
  • the pocket bottom brick have a longer service life thanks to the significant reduction in the temperature of the wall of the pouring channel, as explained above, but also the plate fixed casting system which adjoins the bottom of the ladle is effectively cooled and thus has a significantly increased service life.
  • the pocket bottom brick 2 is produced with a cooling box.
  • a first embodiment is illustrated in FIG. 2.
  • the brick 2 Over a part of its length, the brick 2 has an annular chamber 3 advantageously furnished internally with a metal box 4.
  • a ring hollow 5 In the upper part of the chamber 3 is arranged a ring hollow 5 which extends in a plane transverse to the axis 1 of the pouring channel 1, practically coaxial with said pouring channel.
  • the cooling fluid for example pressurized air
  • the cooling fluid is thus distributed by the distributor ring 5 around the entire periphery of the brick 2 in the upper part of the annular chamber 3 then, after having bypassed the distributor ring, this coolant circulates throughout the annular chamber 3 down to an orifice d discharge 9 located in the vicinity of the transverse plane in which the lower mouth of the pouring channel 1 is located.
  • the cooling device according to the invention also cools the upper part of the fixed plate 20 of the casting system, which adjoins the bottom of the pocket and the lower mouth of the casting channel 1.
  • the temperature reached by this plate can thus be reduced significantly, which avoids excessive and too rapid wear of the wall of the tap hole 21 of this plate.
  • FIG. 3 shows another embodiment of the device for cooling the pocket bottom brick.
  • the annular chamber 3 in which the distributor ring 5 for the cooling fluid is located is formed by an external metal box 4 which surrounds at least part of the pocket bottom brick 2 and comes to adjoin the fixed plate 20 of the casting system.
  • the reference numerals which are the same as in Figure 2 denote similar or equivalent elements.
  • the coolant introduced into the box 4 by the supply pipe 8 is directed towards the distributor ring 5 by the pipe 7 formed inside the box 4 by an internal metal box 11.
  • the cooling fluid is then distributed in the upper part of the annular chamber 3 through the holes 6 of the distributor ring 5 and descends towards the bottom of the box 4 as shown by the arrows. Part of the cooling fluid is evacuated through the evacuation orifice 9.
  • the inner wall of the box 4 is pierced with several spaced orifices 12, distributed over the entire perimeter so as to let part of the cooling fluid pass to the upper part of the fixed plate 20 of the casting system.
  • An annular channel 13 is advantageously provided practically coaxially with the tap hole 21 of the fixed plate 20 of the casting system to allow the cooling fluid passing through the orifices 12 and thus form a cooling sheath at the top of the fixed plate 20 supra.

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

Abstract

A ring-shaped cooling chamber (3) extends on the contour of the brick of the bottom of the ladle (2) on at least a portion of the length of the brick (2), and comprises a hollow ring (5) arranged in the ring-shaped chamber (3) so as to extend coaxially to the runner (1), the wall of said ring (5) being drilled with holes (6) distributed along the ring. The inner volume of the ring (5) communicates with a cooling fluid supply line (8), the wall of the ring-shaped chamber (3) having an opening (9) for evacuating the cooling fluid distributed by the distribution ring (5) in the ring-shaped chamber (3).

Description

La présente invention concerne les poches de coulée pour métal en fusion, par exemple l'acier, et plus particulièrement un perfectionnement pour refroidir la brique de fond de poche de ces poches de coulée pendant leur utilisation.The present invention relates to ladles for molten metal, for example steel, and more particularly to an improvement for cooling the pocket bottom brick of these ladles during their use.

Les briques de fond de poche sont des briques réfractaires qui garnissent la paroi du canal de coulée des poches de coulée. Le contact de l'air avec la brique réfractaire durant la coulée érode quelque peu la brique. D'autre part, quand, en fin de coulée, on ramène la poche à l'entretien, le canal de coulée est encore rempli d'acier qui se trouve en grande partie solidifié. Il faut alors brûler cette carotte d'acier à l'aide d'une lance à oxygène de manière à nettoyer la paroi de la brique de fond de poche. Lors de cette opération la brique s'abîme le plus fort car le dard du brûleur provoque au point de contact une élévation très importante de la température et partant une détérioration de la surface intérieure.The pocket bottom bricks are refractory bricks which line the wall of the pouring channel with the ladles. The contact of air with the refractory brick during casting somewhat erodes the brick. On the other hand, when, at the end of casting, the ladle is returned to maintenance, the pouring channel is still filled with steel which is largely solidified. It is then necessary to burn this steel core using an oxygen lance so as to clean the wall of the pocket bottom brick. During this operation, the brick is damaged the most strongly because the burner dart causes at the point of contact a very significant rise in temperature and consequently a deterioration of the interior surface.

De plus, la paroi du trou de coulée dans la plaque fixe du système de coulée, qui se trouve sous le fond de la poche, subit une usure assez sensible sous l'effet de la haute température de l'acier.In addition, the wall of the tap hole in the fixed plate of the pouring system, which is located under the bottom of the ladle, undergoes fairly significant wear under the effect of the high temperature of the steel.

L'invention a pour objet un perfectionnement visant à permettre le refroidissement continu de la brique de fond de poche pendant la coulée de métal et pendant les opérations d'entretien de manière à protéger la paroi de cette brique contre une température trop élevée et éviter ainsi son érosion lente mais régulière pendant la coulée de métal et la détérioration de la paroi du canal de coulée pendant les opérations d'entretien.The invention relates to an improvement aimed at allowing the continuous cooling of the pocket bottom brick during metal casting and during maintenance operations so as to protect the wall of this brick against too high a temperature and thus avoid its slow but steady erosion during metal casting and the deterioration of the wall of the pouring channel during maintenance operations.

Cet objectif est atteint, selon l'invention, par une poche de coulée se caractérisant par une chambre de refroidissement annulaire s'étendant sur le pourtour de la brique de fond de poche, un anneau creux étant disposé dans la chambre annulaire en sorte de s'étendre pratiquement coaxialement au canal de coulée, la paroi de cet anneau étant percée de trous répartis le long de l'anneau, le volume intérieur de l'anneau étant en communication avec une conduite d'amenée de fluide de refroidissement, la paroi de la chambre annulaire ayant une ouverture pour l'évacuation du fluide de refroidissement distribué par l'anneau distributeur dans la chambre annulaire. La chambre de refroidissement annulaire peut être formée dans la brique de fond de poche ou être formée par un caisson externe entourant au moins une partie de la brique de fond de poche.This objective is achieved, according to the invention, by a ladle characterized by an annular cooling chamber extending around the periphery of the pocket bottom brick, a hollow ring being arranged in the annular chamber so as to s extend practically coaxially to the pouring channel, the wall of this ring being pierced with holes distributed along the ring, the interior volume of the ring being in communication with a coolant supply pipe, the wall of the annular chamber having an opening for the evacuation of the cooling fluid distributed by the distributor ring in the annular chamber. The annular cooling chamber can be formed in the pocket bottom brick or be formed by an external box surrounding at least part of the pocket bottom brick.

Grâce à l'invention, non seulement la brique de fond de poche a-t-elle une durée de vie plus longue grâce à la réduction sensible de la température de la paroi du canal de coulée, comme expliqué plus haut, mais également la plaque fixe du système de coulée qui jouxte le fond de la poche de coulée est refroidie efficacement et a ainsi une durée de vie sensiblement augmentée.Thanks to the invention, not only does the pocket bottom brick have a longer service life thanks to the significant reduction in the temperature of the wall of the pouring channel, as explained above, but also the plate fixed casting system which adjoins the bottom of the ladle is effectively cooled and thus has a significantly increased service life.

L'invention est exposée en détail dans ce qui suit avec référence aux dessins ci-annexés dans lesquels:

  • la figure 1 est une vue partielle en perspective du fond d'une poche de coulée d'acier,
  • la figure 2 montre en coupe un premier mode d'exécution d'une brique de fond de poche selon l'invention,
  • la figure 3 montre, avec coupe partielle, un deuxième mode d'exécution d'une brique de fond de poche selon l'invention.
The invention is described in detail in the following with reference to the attached drawings in which:
  • FIG. 1 is a partial perspective view of the bottom of a steel ladle,
  • FIG. 2 shows in section a first embodiment of a pocket bottom brick according to the invention,
  • Figure 3 shows, with partial section, a second embodiment of a pocket bottom brick according to the invention.

Se référant à la figure 1, on voit le fond d'une poche de coulée 10 avec le canal de coulée 1 garni d'une brique réfractaire 2 dite brique de fond de poche. La plaque fixe du système de coulée dont question plus haut est désignée par la référence numérique 20.Referring to Figure 1, we see the bottom of a ladle 10 with the pouring channel 1 lined with a refractory brick 2 called bottom brick pocket. The fixed plate of the casting system mentioned above is designated by the reference numeral 20.

Suivant l'invention, la brique de fond de poche 2 est réalisée avec un caisson de refroidissement. Un premier mode d'exécution est illustré par la figure 2. Sur une partie de sa longueur, la brique 2 présente une chambre annulaire 3 avantageusement garnie intérieurement d'un caisson métallique 4. Dans la partie supérieure de la chambre 3 est disposé un anneau creux 5 qui s'étend dans un plan transversal à l'axe 1 du canal de coulée 1, pratiquement coaxialement audit canal de coulée. La paroi de l'anneau creux 5 et percée de trous 6 distribués sur toute la longueur de l'anneau. Celui-ci sert de distribution pour un fluide de refroidissement introduit dans l'anneau 5 par un conduit métallique7 connecté à une conduite d'amenée de fluide 8. Le fluide de refroidissement, par exemple de l'air sous pression, se trouve ainsi distribué par l'anneau distributeur 5 sur tout le pourtour de la brique 2 dans la partie supérieure de la chambre annulaire 3 puis, après avoir contourné l'anneau distributeur, ce fluide de refroidissement circule dans toute la chambre annulaire 3 en descendant vers un orifice d'évacuation 9 situé au voisinage du plan transversal dans lequel est située l'embouchure inférieure du canal de coulée 1. En assurant un débit suffisant du fluide de refroidissement, celui-ci refroidit la brique de fond de poche 2 de manière efficace, ce qui évite la dégradation trop rapide de la brique 2 et permet d'augmenter de façon très appréciable sa durée de vie.According to the invention, the pocket bottom brick 2 is produced with a cooling box. A first embodiment is illustrated in FIG. 2. Over a part of its length, the brick 2 has an annular chamber 3 advantageously furnished internally with a metal box 4. In the upper part of the chamber 3 is arranged a ring hollow 5 which extends in a plane transverse to the axis 1 of the pouring channel 1, practically coaxial with said pouring channel. The wall of the hollow ring 5 and pierced with holes 6 distributed over the entire length of the ring. This serves as a distribution for a cooling fluid introduced into the ring 5 by a metal conduit 7 connected to a fluid supply pipe 8. The cooling fluid, for example pressurized air, is thus distributed by the distributor ring 5 around the entire periphery of the brick 2 in the upper part of the annular chamber 3 then, after having bypassed the distributor ring, this coolant circulates throughout the annular chamber 3 down to an orifice d discharge 9 located in the vicinity of the transverse plane in which the lower mouth of the pouring channel 1 is located. By ensuring a sufficient flow of the coolant, the latter cool the pocket bottom brick 2 effectively, which avoids too rapid degradation of the brick 2 and makes it possible to significantly increase its service life.

De plus, le dispositif de refroidissement selon l'invention refroidit également la partie supérieure de la plaque fixe 20 du système de coulée, qui jouxte le fond de la poche et l'embouchure inférieure du canal de coulée 1. La température atteinte par cette plaque peut ainsi être réduite de façon sensible, ce qui permet d'éviter une usure trop importante et trop rapide de la paroi du trou de coulée 21 de cette plaque.In addition, the cooling device according to the invention also cools the upper part of the fixed plate 20 of the casting system, which adjoins the bottom of the pocket and the lower mouth of the casting channel 1. The temperature reached by this plate can thus be reduced significantly, which avoids excessive and too rapid wear of the wall of the tap hole 21 of this plate.

La figure 3 représente un autre mode d'exécution du dispositif de refroidissement de la brique de fond de poche. Dans cet exemple d'exécution, la chambre annulaire 3 dans laquelle se trouve l'anneau distributeur 5 pour le fluide de refroidissement est formée par un caisson métallique externe 4 qui ceinture une partie au moins de la brique de fond de poche 2 et vient jouxter la plaque fixe 20 du système de coulée. Dans la figure 3, les références numériques qui sont les mêmes que dans la figure 2 désignent des éléments similaires ou équivalents. Le fluide de refroidissement introduit dans le caisson 4 par la conduite d'amenée 8 est dirigé vers l'anneau distributeur 5 par le conduit 7 formé à l'intérieur du caisson 4 par un caisson métallique interne 11. Le fluide de refroidissement est ensuite distribué dans la partie supérieure de la chambre annulaire 3 par les trous 6 de l'anneau distributeur 5 et descend vers le bas du caisson 4 comme montré par les flèches. Une partie du fluide de refroidissement est évacuée par l'orifice d'évacuation 9.FIG. 3 shows another embodiment of the device for cooling the pocket bottom brick. In this exemplary embodiment, the annular chamber 3 in which the distributor ring 5 for the cooling fluid is located is formed by an external metal box 4 which surrounds at least part of the pocket bottom brick 2 and comes to adjoin the fixed plate 20 of the casting system. In Figure 3, the reference numerals which are the same as in Figure 2 denote similar or equivalent elements. The coolant introduced into the box 4 by the supply pipe 8 is directed towards the distributor ring 5 by the pipe 7 formed inside the box 4 by an internal metal box 11. The cooling fluid is then distributed in the upper part of the annular chamber 3 through the holes 6 of the distributor ring 5 and descends towards the bottom of the box 4 as shown by the arrows. Part of the cooling fluid is evacuated through the evacuation orifice 9.

Dans sa partie inférieure, la paroi intérieure du caisson 4 est percée de plusieurs orifices espacés 12, répartis sur tout le périmètre de manière à laisser passer une partie du fluide de refroidissement vers la partie supérieure de la plaque fixe 20 du système de coulée. Un canal annulaire 13 est avantageusement prévu pratiquement coaxialement au trou de coulée 21 de la plaque fixe 20 du système de coulée pour laisser circuler le fluide de refroidissement passant par les orifices 12 et former ainsi une gaine de refroidissement à la partie supérieure de la plaque fixe 20 précitée. On obtient ainsi un refroidissement efficace de la plaque fixe en question et une réduction très sensible de l'usure de son trou de coulée. Des essais ont montré que le nombre de coulées que l'on peut effectuer avant de remplacer la plaque fixe est sensiblement augmenté, ce qui a une incidence appréciable sur l'économie de l'opération de coulée.In its lower part, the inner wall of the box 4 is pierced with several spaced orifices 12, distributed over the entire perimeter so as to let part of the cooling fluid pass to the upper part of the fixed plate 20 of the casting system. An annular channel 13 is advantageously provided practically coaxially with the tap hole 21 of the fixed plate 20 of the casting system to allow the cooling fluid passing through the orifices 12 and thus form a cooling sheath at the top of the fixed plate 20 supra. This provides effective cooling of the fixed plate in question and a very significant reduction in the wear of its taphole. Tests have shown that the number of castings which can be carried out before replacing the fixed plate is appreciably increased, which has an appreciable impact on the economy of the casting operation.

Claims (10)

1. A teeming ladle for molten metal, having a bottom nozzle (2) formed with a runner (1), characterized by comprising a ring-shaped cooling chamber (3) extending on the contour of the nozzle (2) on at least a portion of the nozzle length; and a hollow ring (5) so disposed in the ring-shaped chamber (3) as to extend coaxially to the runner (1), the wall of said ring (5) being. drilled with holes (6) distributed along the ring, the inner volume of the ring (5) communicating with a cooling fluid supply line (8), the wall of the ring-shaped chamber (3) being formed with an opening (9) for removal of the cooling fluid distributed by the distributor ring (5) in the ring-shaped chamber (3).
2. A ladle according to Claim 1, wherein the ring-shaped cooling chamber (3) is contrived in the bottom nozzle (2).
3. A ladle according to Claim 2, wherein the ring-shaped cooling chamber (3) has internally an inner metal casing (4).
4. A ladle according to Claim 1, wherein the ring-shaped cooling chamber (3) is bounded by an outer casing (4) which extends around at least a portion of the bottom nozzle (2).
5. A ladle according to Claim 4, wherein the inner wall of the outer casing (4) is formed with holes (12) in spaced-apart relationship on the wall perimeter for the passage of some of the cooling fluid towards the top of the stationary plate (20) of the teeming system.
6. A ladle according to Claim 5, comprising an annular channel (13) extending substantially coaxially to the runner to facilitate the flow of the cooling fluid which passes through said holes (12) and to form a cooling sheath at the top of the stationary plate (20) of the teeming system.
7. A teeming ladle for teeming a molten metal, having an axial runner (1), characterized by comprising a ring-shaped cooling chamber (3) formed on its periphery and extending over at least a portion of its length, a hollow ring (5) being so disposed in the ring-shaped chamber (3) as to extend substantially coaxially to the runner (1),thewall of said ring (5) being drilled with holes (6) distributed along the ring, said hollow ring (5) being connected to a duct (7) extending through the outer wall of the ring-shaped chamber (3) in order to provide a communication between the inner volume of the ring (5) and a cooling fluid supply line (8), the wall of the ring-shaped chamber (3) being formed with an opening (9) for removal of the cooling fluid distributed by the distributor ring (5) in the ring-shaped chamber (3).
8. A nozzle according to Claim 7, wherein the ring-shaped chamber (3) has internally a metal wall (4).
EP86900091A 1984-11-23 1985-11-19 Improvements to molten metal ladles Expired EP0203979B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86900091T ATE34107T1 (en) 1984-11-23 1985-11-19 IMPROVEMENTS IN CASTING LADLES FOR LIQUID METALS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE0/214046A BE901117A (en) 1984-11-23 1984-11-23 Ladle nozzle brick - with peripheral cooling jacket
BE214046 1984-11-23

Publications (2)

Publication Number Publication Date
EP0203979A1 EP0203979A1 (en) 1986-12-10
EP0203979B1 true EP0203979B1 (en) 1988-05-11

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ID=3843819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86900091A Expired EP0203979B1 (en) 1984-11-23 1985-11-19 Improvements to molten metal ladles

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US (1) US4724985A (en)
EP (1) EP0203979B1 (en)
JP (1) JPS62500844A (en)
CA (1) CA1258170A (en)
DE (1) DE3562572D1 (en)
ES (1) ES8606941A1 (en)
WO (1) WO1986003147A1 (en)

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EP0435860B1 (en) * 1986-05-29 1993-08-25 Baxter International Inc. Adapter for connecting with a drug vial to introduce a beneficial agent to a patient
BE1000777A7 (en) * 1987-07-31 1989-04-04 Rech S Et Dev Desaar IMPROVEMENT IN METAL CASTING POCKETS.
US5040773A (en) * 1989-08-29 1991-08-20 Ribbon Technology Corporation Method and apparatus for temperature-controlled skull melting
US5409197A (en) * 1993-02-08 1995-04-25 Davis; Michael Cooling member for blast furnace tap opening
DE19819114C1 (en) * 1998-04-29 2000-01-05 Didier Werke Ag Fireproof duct with external insulation and method for sealing joints
CN100513012C (en) * 2006-12-31 2009-07-15 西安重型机械研究所 Rotary pouring-basket cooling system

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Publication number Priority date Publication date Assignee Title
US1145948A (en) * 1914-10-29 1915-07-13 Joseph H Wallace Water-cooled blowpipe.
US2136394A (en) * 1935-06-29 1938-11-15 Frank F Poland Casting metal
US2225660A (en) * 1939-11-16 1940-12-24 George D Rogers Pouring spout
US2517931A (en) * 1947-05-15 1950-08-08 Rossi Irving Apparatus for the continuous casting of metal
BE667322A (en) * 1964-07-23
DE1483637A1 (en) * 1965-03-09 1969-09-25 Schloemann Ag Method and device for pouring overheated metal melts
FR1527380A (en) * 1967-06-14 1968-05-31 Ashmore Benson Apparatus through which hot molten metal can flow on contact with a surface
US3570713A (en) * 1969-04-14 1971-03-16 Schloemann Ag Pouring of melts
US4360190A (en) * 1981-03-16 1982-11-23 Junichi Ato Porous nozzle for molten metal vessel
JPH0710736B1 (en) * 1981-10-13 1995-02-08 Utsudeingu Corp
US4426067A (en) * 1983-01-07 1984-01-17 The Calumite Company Metallic sectional liquid-cooled runners

Also Published As

Publication number Publication date
DE3562572D1 (en) 1988-06-16
WO1986003147A1 (en) 1986-06-05
CA1258170A (en) 1989-08-08
US4724985A (en) 1988-02-16
JPS62500844A (en) 1987-04-09
ES549141A0 (en) 1986-05-16
ES8606941A1 (en) 1986-05-16
EP0203979A1 (en) 1986-12-10

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