EP0433419B1 - Dispositif de jonction par la fonte exempte de scories pour installations de coulee continue - Google Patents

Dispositif de jonction par la fonte exempte de scories pour installations de coulee continue Download PDF

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Publication number
EP0433419B1
EP0433419B1 EP90909701A EP90909701A EP0433419B1 EP 0433419 B1 EP0433419 B1 EP 0433419B1 EP 90909701 A EP90909701 A EP 90909701A EP 90909701 A EP90909701 A EP 90909701A EP 0433419 B1 EP0433419 B1 EP 0433419B1
Authority
EP
European Patent Office
Prior art keywords
starter
tube
melt
starting
vessel
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 - Lifetime
Application number
EP90909701A
Other languages
German (de)
English (en)
Other versions
EP0433419A1 (fr
EP0433419B2 (fr
Inventor
Bernhard Tinnes
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.)
Metacon AG
Original Assignee
Metacon AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6384608&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0433419(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Metacon AG filed Critical Metacon AG
Priority to AT90909701T priority Critical patent/ATE90600T1/de
Publication of EP0433419A1 publication Critical patent/EP0433419A1/fr
Application granted granted Critical
Publication of EP0433419B1 publication Critical patent/EP0433419B1/fr
Publication of EP0433419B2 publication Critical patent/EP0433419B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/103—Distributing the molten metal, e.g. using runners, floats, distributors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001—Retaining slag during pouring molten metal
    • B22D43/002—Retaining slag during pouring molten metal by using floating means

Definitions

  • the invention relates to a device for slag-free casting of continuous casting plants with a slide closure at the pouring opening of a tundish and a starting tube blocking the inlet of the pouring opening when the vessel is filled with molten metal.
  • the aim of such devices is only to allow clean melt with the highest possible temperature or without excessive cooling losses to get into the pouring opening of the distribution vessel and thus through the slide closure into the mold.
  • the predetermined breaking point can function earlier than intended, so that slag floating on the melt is entrained into the pouring opening and deposited in the mold above the cold strand head.
  • Such non-metallic nests in the mold always mean a risk associated with the breakthrough of the melt when the cold strand begins to be drawn off.
  • the object of the present invention is to effectively improve starting devices of the type mentioned and, above all, to enable timely release of slag-free melt on the starting pipe.
  • the stated object is essentially achieved in that the starting tube is loosely associated with a separate starting body, which rises as the melt level rises from a predetermined fill level to release the melt flow.
  • the release of the starting body and thus the release of the melt flow is solely dependent on the buoyancy potential of the starting body, which is determined in selection with the body height and the free length of the starting tube.
  • the release phase runs freely, in contrast to a device in which a detachable part is arranged on a fixed part by means of a connection to be destroyed. Seen as a whole, the casting of continuous casting systems is more timely, more accurate and safer, even with multiple continuous casting systems.
  • the melt level that forms in the distribution vessel can be covered with a covering powder at an early stage, which keeps the melt warm and thus prevents freezing in the slide closure without fear of slag and covering powder flowing off together with the melt into the mold.
  • the procedure according to the invention is such that a hollow body-shaped starting body lies loosely on its inlet end in the extension of the starting tube.
  • a hollow cylindrical body is preferred, which is cheap in terms of production and can be effectively heated together with the distribution vessel before use. It is advantageous to give the starting body a guide which runs along the inside or outside of the starting tube and forms an annular gap between the two bodies, which guides the starting body and guides it loosely when the body floats up.
  • An expedient embodiment of the invention is also to be seen in the fact that instead of a starting body, optionally equipped with a guide, resting on the inlet end of the starting tube, a tubular starting body projecting beyond the starting tube is provided with an annular gap, the tubular starting body being located on the Can support the bottom of the vessel or on the start tube.
  • a starting body resting on the starting tube which is provided with a guide
  • the starting tube and starting body can be conically formed in one another in the same way.
  • the annular gap between the starting tube and the starting body becomes larger in accordance with the rate of climb of the starting body, which accommodates a smooth melt flow over the inlet end of the starting tube.
  • the invention also proposes that the area of the starting body opposite the drain openings be designed as a seal, preferably as an inherently elastic ceramic fiber seal, which additionally contributes to the functionally correct operation of the device.
  • a molten steel stream A flows from a regulated pouring spout of a ladle, not shown, into a distributor vessel which has a sheet metal jacket 2, a refractory lining 3 and a pouring opening 5 arranged in the bottom 4 of the vessel.
  • a melt 6 on which a slag blanket 7 floats, which can consist of impurities, for example in the form of oxides and a covering powder, which is applied in order to prevent reoxidations and heat radiation from the melt.
  • a slag blanket 7 floats, which can consist of impurities, for example in the form of oxides and a covering powder, which is applied in order to prevent reoxidations and heat radiation from the melt.
  • it is important to prevent that, when filling the distribution vessel 1 with melt 6, non-metallic mass or Slag 7 gets into the pouring opening 5 and thus into the continuous casting mold 10 via the slide closure 8 and the immersion tube 9. Arrived there slag 7 would deposit on the cold strand 11 and inevitably lead
  • the pouring opening 5 is blocked off by means of a refractory starting tube 12 arranged coaxially above it on the vessel bottom 4.
  • the starting body 13 represents an extension of the starting tube 12 in order to effect it that a certain melt level 6a with a fill level H is reached in the distribution vessel 1 before the outflow of melt 6 via the start pipe inlet end 12a begins by floating the start body 13 as shown in dash-dotted lines.
  • an appropriate body height 13a of the starting body 13 is required for the starting body 13, depending on its density and the length of the starting tube 12, as an extension thereof.
  • the outflow of melt via the inlet end 12a of the starting tube 12 begins calmly and in a balanced manner, that is to say without outflow turbulence, so that when the starting body 13 begins to lift, the slag blanket 7 is not too far away from the inlet end 12a of the starting tube 12 needs.
  • the melt level 6a continues to rise under the outflow of melt 6 through the pouring opening 5 into the mold until the desired fill level of the distribution vessel 1, which is not apparent from the drawing, is reached. Thereafter, the target fill level reached is maintained by control technology, in coordination with the slide closure 8 on the spout 5 of the distribution vessel 1, which controls the inflow to the mold 10.
  • the starting tube 12 which consists of a material that can be consumed by the melt, usually dissolves, so that at the end of the casting process the distribution vessel 1 can be completely emptied.
  • the starting body 15 shown in FIG. 2 is designed like a cap. It has an outer guide 15a, which surrounds the inlet end 16a of the starting tube 16 and thus prevents undesired slipping.
  • the entry of melt 6 into the starting tube 16 in the annular gap 17 between the guide 15a and the starting tube 16 is made more uniform.
  • the situation is similar with the starting body 18 according to FIG. 3, which rests on a starting tube 19 which tapers conically towards the pouring opening 5 and thereby engages with an inner conical guide 18a in the inlet end 19a. This, in turn, leaving an annular gap 20 which increases steadily as the starting body 18 floats, and in which an equally continuously increasing amount of melt flows.
  • the starting pipe 21 is provided with leading, saw-like influence passages 21c at the inlet end 21a and near the vessel bottom 4 with radial drain openings 21b.
  • a tubular starting body 22 surrounds the starting tube 21 centrally by means of an annular gap 23.
  • the drain openings 21b are closed by a seal 22a which is arranged on the starting body 22 and bridges the gap 23 and which, for example, consists of glued-on ceramic, elastically flexible fiber material.
  • the starting body 22 begins to float after reaching the fill level H and gradually releases the drain openings 21b for the melt 6 to flow into the pouring opening. As the starting body 22 continues to rise, melt 6 is also released gradually at the inlet end 21a of the starting tube 21 via the influence passages 21c which widen in the vertical direction.
  • the drain openings 21b can be elongated holes 24 or be designed as rows of rings of smaller discharge openings 25.
  • a starting tube 26 which is flared towards the pouring opening 5 is used, the outlet openings 26b arranged in the vessel bottom near 4 are covered by an inverted conical starting body 27 of the same type using its own weight.
  • the starting body 27 has on the inside a sealing surface 27a which also bridges an annular gap 28 and which gently opens the drain openings 26b when the starting body 27 floats after the melt fill level H has been reached.
  • the annular gap 28 widens just as gently to allow melt 6 to drain off via the inlet end 26a of the starting tube 26.
  • the region of the drain openings 21b of the cylindrical starting body 21 according to FIG. 4 can be designed conically, in order to create a setting base for a likewise conical seal 22a.
  • the device according to FIG. 4 can also work without drain openings 21b and seals 22a.
  • the starting tube 26 according to FIG. 5 can be conically inverted and the starting body 27 with its sealing surface 27a can act inside the starting tube 26.
  • the new starting device in the described embodiment can also be used on continuous casting plants which work on the tundish 1 alone with spout 5 filled with nozzles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)

Abstract

Un dispositif comprend un tuyau usuel de départ à l'entrée d'un orifice de décharge (5) d'un récipient distributeur et un corps séparé de départ, associé de manière lâche audit tuyau de départ, qui flotte sur la fonte (6) lorsque celle-ci atteint la hauteur (H) voulue de remplissage. Le fonctionnement du dispositif est ainsi amélioré avec des moyens simples et permet de manière automatique à la fonte exempte de scories de s'écouler à temps par le tuyau de départ (12).

Claims (10)

1. Dispositif pour la coulée sans laitier dans des installations de coulée continue, comportant en particulier un obturateur à tiroir disposé au niveau de la busette de coulée d'un répartiteur (tundish) et un tube d'amorçage de coulée qui ferme l'entrée de la busette lors du remplissage du répartiteur avec le métal en fusion, caractérisé par le fait qu'un élément d'amorçage (13, 15, 18, 22 et 27) séparé qui est monté libre sur le tube d'amorçage (12, 16, 19, 21 et 26) se soulève pour libérer le passage du métal lorsque le niveau du bain (a) s'élève au-delà d'un niveau (H).
2. Dispositif selon la revendication 1, caractérisé par le fait qu'un élément d'amorçage (13, 15 et 18) creux repose librement sur l'entrée (12a, 16a et 19a) du tube d'amorçage (12, 16, 19), dans le prolongement de celui-ci.
3. Dispositif selon la revendication 2, caractérisé par le fait que l'élément d'amorçage (15 et 18) comporte une partie de guidage (15a et 18a) qui s'étend le long de la surface intérieure et/ou de la surface extérieure du tube d'amorçage (16 et 19) en formant un espace annulaire.
4. Dispositif selon la revendication 1, caractérisé par le fait qu'il est prévu un élément d'amorçage (22 et 27) tubulaire intérieur ou extérieur qui dépasse par rapport à l'entrée (21 a et 26a) du tube d'amorçage (21 et 26) en formant un espace annulaire (23 et 28) et repose sur le fond du répartiteur (4) ou sur le tube d'amorçage (26).
5. Dispositif selon les revendications 3 et 4, caractérisé par le fait qu'un tube d'amorçage (19 et 26) et un élément d'amorçage (18, 18a et 27) de forme conique semblable sont montés l'un dans l'autre.
6. Dispositif selon les revendications 4 et 5, caractérisé par le fait que le tube d'amorçage (21) comporte à son entrée (21 a) des passages (21 c) dont la section s'élargit dans la direction de soulèvement de l'élément d'amorçage.
7. Dispositif selon les revendications 4 et 6, caractérisé par le fait que des orifices d'écoulement (21 b et 26b) radiaux qui sont fermés par l'élément d'amorçage (22 et 27) sont aménagés dans le tube d'amorçage (21 et 26) à proximité du fond (4) du répartiteur.
8. Dispositif selon la revendication 7, caractérisé par le fait qu'il est prévu des orifices d'écoulement (24 et 25) agencés dans le sens d'une augmentation de la section de passage dans la direction de soulèvement de l'élément d'amorçage (22).
9. Dispositif selon les revendications 7 et 8, caractérisé par le fait que la partie de l'élément d'amorçage (22 et 27) située en regard des orifices d'écoulement (21 b, 24, 25 et 26b) est agencée sous forme de joint (22a et 27a).
10. Dispositif selon la revendication 9, caractérisé par le fait que l'on utilise comme joint (22a) un élément en fibres céramiques présentant une élasticité propre.
EP90909701A 1989-07-08 1990-06-27 Dispositif de jonction par la fonte exempte de scories pour installations de coulee continue Expired - Lifetime EP0433419B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90909701T ATE90600T1 (de) 1989-07-08 1990-06-27 Vorrichtung zum schlackenfreien angiessen von stranggiessanlagen.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3922549A DE3922549A1 (de) 1989-07-08 1989-07-08 Vorrichtung zum schlackenfreien angiessen von stranggiessanlagen
DE3922549 1989-07-08
PCT/EP1990/001025 WO1991000788A1 (fr) 1989-07-08 1990-06-27 Dispositif de jonction par la fonte exempte de scories pour installations de coulee continue

Publications (3)

Publication Number Publication Date
EP0433419A1 EP0433419A1 (fr) 1991-06-26
EP0433419B1 true EP0433419B1 (fr) 1993-06-16
EP0433419B2 EP0433419B2 (fr) 2002-06-05

Family

ID=6384608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90909701A Expired - Lifetime EP0433419B2 (fr) 1989-07-08 1990-06-27 Dispositif de jonction par la fonte exempte de scories pour installations de coulee continue

Country Status (7)

Country Link
US (1) US5191926A (fr)
EP (1) EP0433419B2 (fr)
JP (1) JPH04501385A (fr)
CA (1) CA2035028A1 (fr)
DE (2) DE3922549A1 (fr)
ES (1) ES2043381T3 (fr)
WO (1) WO1991000788A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679162A1 (fr) * 1991-07-18 1993-01-22 Siderurgie Fse Inst Rech Dispositif de transfert par jet de metal liquide, notamment d'une poche de coulee continue vers un repartiteur.
KR100953623B1 (ko) 2002-12-26 2010-04-20 주식회사 포스코 연속주조기에서 개재물 부상을 위해 턴디쉬 내부에 설치되는 용강 가이드 틀
GB2450896A (en) * 2007-07-10 2009-01-14 Anglo American Platinum Corp Separating apparatus and method for assaying
KR101149183B1 (ko) * 2009-05-26 2012-05-25 현대제철 주식회사 불순물 혼입 방지장치
WO2014094157A1 (fr) * 2012-12-17 2014-06-26 Polar Sapphire Ltd. Procédé et appareil pour fondre de l'oxyde d'aluminium

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151533C2 (de) * 1981-12-24 1983-11-24 Günter Dr.-Ing. 5750 Menden Altland Verlängerte Ausgußdüse für Zwischenbehälter
US4394006A (en) * 1982-04-07 1983-07-19 Electric Power Research Institute, Inc. Molten metal flow control
US4526349A (en) * 1983-12-13 1985-07-02 Schwer John W Method and article of manufacture for controlling slag carry-over during tapping of a heat in steelmaking
DE3701701A1 (de) * 1987-01-22 1988-08-04 Didier Werke Ag Startrohr fuer ein schmelzengefaess
DE3701707A1 (de) * 1987-01-22 1989-12-28 Nolde Sylvia Wandelbares polstermoebel
DE8907044U1 (fr) * 1989-06-08 1989-08-03 Foseco International Ltd., Birmingham, Gb

Also Published As

Publication number Publication date
ES2043381T3 (es) 1993-12-16
DE3922549C2 (fr) 1991-07-18
WO1991000788A1 (fr) 1991-01-24
DE59001788D1 (de) 1993-07-22
CA2035028A1 (fr) 1991-01-09
EP0433419A1 (fr) 1991-06-26
US5191926A (en) 1993-03-09
EP0433419B2 (fr) 2002-06-05
JPH04501385A (ja) 1992-03-12
DE3922549A1 (de) 1991-01-10

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