EP0433419B2 - Device for slag-free casting on in continuous casting installations - Google Patents

Device for slag-free casting on in continuous casting installations Download PDF

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Publication number
EP0433419B2
EP0433419B2 EP90909701A EP90909701A EP0433419B2 EP 0433419 B2 EP0433419 B2 EP 0433419B2 EP 90909701 A EP90909701 A EP 90909701A EP 90909701 A EP90909701 A EP 90909701A EP 0433419 B2 EP0433419 B2 EP 0433419B2
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EP
European Patent Office
Prior art keywords
starter
tube
melt
starting
vessel
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EP90909701A
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German (de)
French (fr)
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EP0433419A1 (en
EP0433419B1 (en
Inventor
Bernhard Tinnes
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Metacon AG
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Metacon AG
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Priority to AT90909701T priority Critical patent/ATE90600T1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10Supplying or treating molten metal
    • B22D11/103Distributing the molten metal, e.g. using runners, floats, distributors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D43/00Mechanical cleaning, e.g. skimming of molten metals
    • B22D43/001Retaining slag during pouring molten metal
    • B22D43/002Retaining 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 Slider closure on the pouring opening of a tundish and one when filling the Vessel with molten metal that blocks the inlet of the pouring spout.
  • the predetermined breaking point is known, which is influenced by the burn-through and / or the buoyancy of the melt breaks.
  • the broken pipe piece floats and gives the melt the way to the pouring spout of the vessel over the remaining tube on the bottom of the vessel.
  • the approval process is from the functional effectiveness of the predetermined breaking point at a desired time.
  • the predetermined breaking point If the predetermined breaking point is not in time, the break must be brought about by handling a rod from the outside on the other hand, which is tedious and time-consuming and time-consuming, especially in multi-line systems the predetermined breaking point can function earlier than intended, so that floating on the melt Slag is entrained into the pouring spout 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 at the start of pulling off the cold strand.
  • the object of the present invention is to effectively improve starting devices of the type mentioned and, above all, automatically enable timely release of slag-free melt on the start pipe.
  • the object is achieved according to the invention with the features of claim 1.
  • This is the release of the starter and thus the release of the melt flow solely dependent on the lift potential of the starting body, the in selection with the body height and the free length of the starting tube. That means the Release phase runs freely, in contrast to a device in which a detachable part on a fixed Part is arranged by means of a connection to be destroyed. Seen as a whole, the casting on of Continuous casting plants are more timely, more accurate and safer, even with multiple continuous casting plants. Furthermore the melt level forming in the distribution vessel can be covered with a covering powder at an early stage, that keeps the melt warm and thus prevents freezing in the slide closure without flowing off of slag, covering powder together with the melt in the mold is to be feared
  • the procedure according to the invention is such that a hollow body-shaped starting body is extended of the start pipe lies loosely on its inlet end.
  • a hollow cylindrical one is available Body that is cheap in terms of manufacture and that works together with the distribution vessel before use can be effectively heated. It is advantageous for the starting body to run along the inside or outside to give the starting tube and an annular gap between the two bodies, which places the starting body and loosely guides when the body floats on.
  • the invention is furthermore to be seen in the fact that instead of an optionally equipped with a guide, on the inlet end of the starting tube, a starting body protruding from the starting tube, inside or outside tubular starter body with an annular gap is provided, the tubular Support the starting body on the bottom of the vessel or on the starting tube. Both with one on the starting tube leave on top with a guide start body, as well as with a tubular start body the starting tube and the starting body are conical in the same way. As a result, the annular gap between Starting tube and starting body larger in accordance with the climbing speed of the starting body, which is a gentle one The melt runs out over the inlet end of the start pipe.
  • the invention proposes furthermore, that the area of the starting body opposite the drain openings as a seal, preferably is designed as an elastic ceramic fiber seal, which in addition to a functional Works the device contributes.
  • a molten steel flow flows from a regulated spout of a ladle, not shown A in a distribution vessel that a sheet metal jacket 2, a refractory lining 3 and one in Vessel bottom 4 arranged spout 5 has.
  • melt 6 on which a slag blanket 7 floats out of impurities, for example in the form of oxides and a covering powder May exist, which is abandoned to reoxidation and heat radiation from the melt submissions.
  • it is important to prevent that when filling the distribution vessel 1 with melt 6, resting on non-metallic mass.
  • Slag 7 in the pouring opening 5 and thus over the slide closure 8 and the dip tube 9 enters the continuous casting mold 10. Arrived there would slag 7 deposit on the cold strand 11 and inevitably when the strand withdrawal device is switched on lead to a melt breakthrough.
  • the pouring opening 5 is coaxially closed this fireproof starting tube 12 arranged on the vessel bottom 4 is shut off. It also serves as a barrier a refractory hollow cylindrical starting body 13, which rests loosely on the inlet end 12a of the starting tube 12 and has a lower mass density than the melt to be cast 6.
  • the starting body 13 represents an extension of the start tube 12 in order to cause a certain one in the distribution vessel 1 Melting level 6a with a fill level H is reached before the melt 6 flows out via the start pipe inlet end 12a begins by floating the starting body 13 as shown in broken lines.
  • the starting body 13 as a function of its density and the length of the starting tube 12 its extension requires an appropriate body height 13a of the starting body 13. This also loses the increase in the melting level 6a constantly in weight, but only increases when the risk of Shrinkage 7 slag together with melt 6 no longer exists.
  • the outflow of melt begins calmly and evenly via the inlet end 12a of the starting tube 12, that means without runoff turbulence, so that when the starting body 13 begins to lift, the slag cover 7 need not be too far from the inlet end 12a of the starting tube 12.
  • the melt level 6a rises under the outflow of melt 6 through the pouring opening 5 into the mold until the target fill level of the tundish, not shown in the drawing 1 is reached. Thereafter, the target level is reached in terms of control technology, in coordination with the the flow to the mold 10 controlling slide closure 8 at the spout 5 of the distribution vessel 1.
  • the starting body 15 shown in FIG. 2 is designed like a cap. He has one outer guide 15a, which surrounds the inlet end 16a of the starting tube 16 and thus an unwanted slipping prevented.
  • the melt 6 enters the starting tube 16 in the annular gap 17 between the guide 15a and the starting tube 16.
  • 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 with a inner conical guide 18a engages in the inlet end 19a. This in turn, leaving one at Floating of the starter body 18 is an ever-increasing annular gap 20, in which an equally constantly larger one increasing amount of melt flows.
  • the starting tube 21 is at the inlet end 21a with leading, saw-like Influence passages 21c and near the vessel bottom 4 provided with radial drain openings 21b.
  • a tubular Starting body 22 surrounds starting tube 21 centrally by means of an annular gap 23.
  • the drainage openings 21b by a seal 22a arranged on the starting body 22 and bridging the gap 23 closed, which consists for example of glued ceramic, resilient fiber material.
  • the starting body 22 begins to float after reaching the fill level H and gradually gives out first the drain openings 21b for the drain of melt 6 into the pouring opening. In the further rise of the starting body 22 then there is an equally gradual release of melt 6 at the inlet end 21a of the Starting tube 21 via the influence passages 21c widening in the height direction.
  • the drain openings 21b can be elongated holes 24 or be designed as ring rows of smaller discharge openings 25.
  • the drain openings 26b arranged in the vessel bottom near 4 from an inverted one equally conical starting body 27 are covered using its own weight.
  • the starting body 27 has a sealing surface 27a which also bridges an annular gap 28 and which Floating of the starting body 27 after the melt fill level H has been reached gently opens the drain openings 26b.
  • the annular gap 28 widens just as gently to allow melt 6 to flow off via the inlet end 26a of the starting tube 26.
  • the device according to FIG. 4 can also work without drain openings 21b and seals 22a.
  • the starting tube 26 can be conical in reverse and the starting body 27 with its sealing surface 27a act inside the starting tube 26.
  • the new starting device can also be used in the described design on continuous casting plants, who work alone with nozzle 5 on the tundish 1.

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  • 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

The device has a conventional starting pipe at the inlet of the discharge orifice (5) of a distributor vessel and a separate starting body which is loosely associated with the starting pipe and which floats when the melt (6) reaches a desired height (H). The device is therefore improved using simple means and permits automatic, correctly timed flow of slag-free melt from the starting pipe (12).

Description

Die Erfindung betrifft eine Vorrichtung zum schlackenfreien Angiessen von Stranggiessanlagen mit einem Schieberverschluss an der Ausgussöffnung eines Verteilergefässes (Tundish) und einem beim Auffüllen des Gefässes mit Metallschmelze den Einlauf der Ausgussöffnung absperrenden Startrohr.The invention relates to a device for slag-free casting of continuous casting plants with a Slider closure on the pouring opening of a tundish and one when filling the Vessel with molten metal that blocks the inlet of the pouring spout.

Derartige Vorrichtungen haben zum Ziel nur saubere Schmelze mit möglichst hoher Temperatur bzw. ohne allzugrosse Abkühlungsveriuste in die Ausgussöffnung des Verteilergefässes und damit durch den Schieberverschluss in die Kokille gelangen zu lassen.The aim of such devices is only clean melt with or without the highest possible temperature All-round cooling losses in the pouring opening of the distribution vessel and thus through the slide closure to get into the mold.

Aus der DE-OS3701701, von welcher der Oberbegriff des Anspruchs 1 ausgeht, Startrohr mit einer ringnutförmigen Sollbruchstelle bekannt, die unter dem Durchbrenneinfluss und/oder dem Auftrieb der Schmelze bricht. Das abgebrochene Rohrstück schwimmt auf und gibt damit der Schmelze den Weg zur Ausgussöffnung des Gefässes über den am Gefässboden stehengebliebenen Rohrrest frei. Der Freigabevorgang ist dabei von der funktionsgerechten Wirksamkeit der Sollbruchstelle zu einem gewünschten Zeitpunkt abhängig. Bricht die Sollbruchstelle nicht rechtzeitig, dann muss der Bruch durch Handhabung einer Stange von aussen herbeigeführt werden, was mühsam und besonders bei mehrsträngigen Anlagen zeitraubend und aufwendig ist Andererseits kann die Sollbruchstelle früher als beabsichtigt funktionieren, so dass auf der Schmelze schwimmende Schlacke in die Ausgussöffnung mitgerissen und über dem Kaltstrangkopf in der Kokille abgelagert wird. Solche nichtmetallische Nester in der Kokille bedeuten stets ein mit dem Durchbruch von Schmelze verbundenes Risiko beim Abziehbeginn des Kaltstranges.DE-OS3701701, from which the preamble of claim 1 is based, starting tube with an annular groove The predetermined breaking point is known, which is influenced by the burn-through and / or the buoyancy of the melt breaks. The broken pipe piece floats and gives the melt the way to the pouring spout of the vessel over the remaining tube on the bottom of the vessel. The approval process is from the functional effectiveness of the predetermined breaking point at a desired time. Breaks the If the predetermined breaking point is not in time, the break must be brought about by handling a rod from the outside on the other hand, which is tedious and time-consuming and time-consuming, especially in multi-line systems the predetermined breaking point can function earlier than intended, so that floating on the melt Slag is entrained into the pouring spout 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 at the start of pulling off the cold strand.

Deshalb wird in der Praxis meistens darauf verzichtet unmittelbar nach Entstehen eines Schmelzepegels im Verteilergefäss Abdeckpulver zur Wärmeisolierung und Luftabschirmung der Schmelze aufzubringen. Dies geschieht erst nach dem Freigeben des Schmelzeflusses mittels des Startrohres, so dass ein erheblicher Wärmeverlust und Reoxidation der Schmelze in Kauf genommen werden muss, was die Ursachen für sich im Schieberverschluss bildende Schmelzeablagerungen bzw. Einfrierungen sein können.For this reason, in practice, this is usually not done immediately after a melt level has occurred Apply cover powder for heat insulation and air shielding of the melt in the distribution vessel. This happens only after the melt flow has been released by means of the start pipe, so that a considerable loss of heat and reoxidation of the melt has to be accepted, which causes itself in the slide closure forming enamel deposits or freezes can be.

Aufgabe vorliegender Erfindung ist es Startvorrichtungen der besagten Art wirkungsmässig zu verbessem und vor allem automatisch eine zeitgerechte Freigabe von schlackenfreier Schmelze am Startrohr zu ermöglichen.The object of the present invention is to effectively improve starting devices of the type mentioned and, above all, automatically enable timely release of slag-free melt on the start pipe.

Die gestellte Aufgabe wird gemäss der Erfindung mit den Merkmalen des Anspruchs 1 gelöst. Auf diese Weise ist die Freigabe des Startkörpers und damit die Freigabe des Schmelzeabflusses allein abhängig vom Auftriebspotential des Startkörpers, das in Auswahl mit der Körperhöhe und der freien Länge des Startrohres bestimmt wird. Das bedeutet, dass die Freigabephase frei abläuft, im Gegensatz zu einer Vorrichtung, bei der ein lösbarer Teil an einem feststehenden Teil mittels einer zu zerstörenden Verbindung angeordnet ist Im ganzen gesehen, wird das Angiessen von Stranggiessanlagen auch bei Mehrstranggiessanlagen zeitgerechter, genauer und sicherer. Darüberhinaus kann der im Verteilergefäss sich bildende Schmelzepegel frühzeitig mit einem Abdeckpulver belegt werden, das die Schmelze warm hält und damit Einfrierungen im Schieberverschluss vorbeugt, ohne das ein Abfliessen von Schlacke, Abdeckpulver zusammen mit der Schmelze in die Kokille zu befürchten istThe object is achieved according to the invention with the features of claim 1. This is the release of the starter and thus the release of the melt flow solely dependent on the lift potential of the starting body, the in selection with the body height and the free length of the starting tube. That means the Release phase runs freely, in contrast to a device in which a detachable part on a fixed Part is arranged by means of a connection to be destroyed. Seen as a whole, the casting on of Continuous casting plants are more timely, more accurate and safer, even with multiple continuous casting plants. Furthermore the melt level forming in the distribution vessel can be covered with a covering powder at an early stage, that keeps the melt warm and thus prevents freezing in the slide closure without flowing off of slag, covering powder together with the melt in the mold is to be feared

Im einzelnen wird gemäss der Erfindung so vorgegangen, dass ein hohlkörperförmiger Startkörper in Verlängerung des Startrohres lose auf dessem Einlaufende aufliegt. Dazu bietet sich vorzugsweise ein hohlzylindrischer Körper an, der herstellungsmässig günstig ist und sich vor dem Einsatz gemeinsam mit dem Verteilergefäss wirksam aufheizen lässt. Dabei ist es vorteilhaft dem Startkörper eine entlang der Innen- oder Aussenseite des Startrohres verlaufende und einen Ringspalt zwischen beiden Körpern bildende Führung zu geben, welche den Startkörper plaziert und beim Aufschwimmen des Körpers lose führt Eine zweckmässige Ausgestaltung der Erfindung ist femer darin zu sehen, dass anstelle eines gegebenenfalls mit einer Führung ausgerüsteten, auf dem Einlaufende des Startrohres aufliegenden Startkörpers ein das Startrohr überragehder, innen- oder aussenseitiger rohrförmiger Startkörper mit Ringspalt vorgesehen ist, wobei sich der rohrförmige Startkörper auf dem Gefässboden oder auf dem Startrohr abstützen kann. Sowohl bei einem auf dem Startrohr aufliegenden mit einer Führung versehenen Startkörper, als auch bei einem rohrförmigen Startkörper lassen sich Startrohr und Startkörper in einander gleichartig konisch ausbilden. Dadurch wird der Ringspalt zwischen Startrohr und Startkörper nach Massgabe der Steiggeschwindigkeit des Startkörpers grösser, was einem sanften Ablauf von Schmelze über das Einlaufende des Startrohres entgegenkommt.In detail, the procedure according to the invention is such that a hollow body-shaped starting body is extended of the start pipe lies loosely on its inlet end. For this purpose, preferably a hollow cylindrical one is available Body that is cheap in terms of manufacture and that works together with the distribution vessel before use can be effectively heated. It is advantageous for the starting body to run along the inside or outside to give the starting tube and an annular gap between the two bodies, which places the starting body and loosely guides when the body floats on. A practical design The invention is furthermore to be seen in the fact that instead of an optionally equipped with a guide, on the inlet end of the starting tube, a starting body protruding from the starting tube, inside or outside tubular starter body with an annular gap is provided, the tubular Support the starting body on the bottom of the vessel or on the starting tube. Both with one on the starting tube leave on top with a guide start body, as well as with a tubular start body the starting tube and the starting body are conical in the same way. As a result, the annular gap between Starting tube and starting body larger in accordance with the climbing speed of the starting body, which is a gentle one The melt runs out over the inlet end of the start pipe.

Dem sanfteren Ablauf von Schmelze über das Einlaufende des Startrohres vomehmlich bei rohrförmigen Startkörpern dient auch der Vorschlag, dass am Einlaufende des Startrohres vor: eilende, im Querschnitt sich in Auftriebsrichtung des Startkörpers erweitemde Einflussdurchtritte vorgesehen sind. Zudem können zum sanfteren Abfluss von Schmelze im Startrohr nahe des Gefässbodens vom rohrförmigen Startkörper abgedeckte, radiale Abflussöffnungen angeordnet sein, deren Durchflussquerschnitt in Auftriebsrichtung des Startkörpers stetig grösser wird. The smoother flow of melt over the inlet end of the start pipe, especially with tubular ones Starting bodies also serve the suggestion that at the inlet end of the starting tube: hurrying, in cross-section itself In the direction of lift of the starter body widening influence passages are provided. In addition, gentler drainage of melt in the starting tube near the bottom of the vessel, covered by the tubular starting body, radial discharge openings can be arranged, the flow cross-section in the lift direction of the starting body is getting bigger and bigger.

Dementsprechend wird beim Ansteigen des Startkörpers zunächst derAbfluss durch die Abflussöffnungen und folgend der Abfluss am Einlaufende des Startrohres frei. Damit zusammenhängend schlägt die Erfindung ferner vor, das der den Abflussöffnungen gegenüberliegende Bereich des Startkörpers als Dichtung, vorzugsweise als in sich elastische keramische Faserdichtung ausgebildet ist, was zusätzlich zu einem funktionsgerechten Arbeiten der Vorrichtung beiträgt.Accordingly, when the starting body rises, the outflow through the outflow openings is first and then the drain at the inlet end of the start pipe is free. In connection with this, the invention proposes furthermore, that the area of the starting body opposite the drain openings as a seal, preferably is designed as an elastic ceramic fiber seal, which in addition to a functional Works the device contributes.

Die Erfindung ist nachstehend anhand der Zeichnung erläutert. Es zeigen in geschnittener Darstellung:

Fig. 1
Das Prinzipschema einer Stranggiessanlage und die
Fig. 2 bis 5
verschiedene Ausführungsbeispiele der Angiessvorrichtung, wobei die
Fig. 4 und 5
in einem etwas grösseren Massstab gezeichnet sind.
The invention is explained below with reference to the drawing. In a cut representation:
Fig. 1
The principle diagram of a continuous caster and the
2 to 5
different embodiments of the pouring device, the
4 and 5
are drawn on a somewhat larger scale.

Gemäss Fig. 1 fliesst aus einem geregelten Ausguss einer nicht dargestellten Giesspfanne ein Stahlschmelzestrom A in ein Verteilergefäss, das einen Blechmantel 2, eine feuerfeste Auskleidung 3 und eine im Gefässboden 4 angeordnete Ausgussöffnung 5 aufweist. Im Gefäss 1 befindet sich Schmelze 6 auf welcher eine Schlackendecke 7 schwimmt, die aus Verunreinigungen zum Beispiel in Form von Oxiden und einem Abdeckpulver bestehen kann, das aufgegeben wird, um Reoxidationen und Wärmeabstrahlungen der Schmelze vorzubeugen. Grundsätzlich gilt es, zu verhindem, dass beim Auffüllen des Verteilergefässes 1 mit Schmelze 6, aufliegende nicht metallische Masse bezw. Schlacke 7 in die Ausgussöffnung 5 und damit über den Schieberverschluss 8 und das Tauchrohr 9 in die Stranggiesskokille 10 gelangt. Dort angekommene Schlacke 7 würde sich über dem Kaltstrang 11 ablagern und beim Einschalten der Strangabzugsvorrichtung unweigerlich zu einem Schmelzedurchbruch führen.1, a molten steel flow flows from a regulated spout of a ladle, not shown A in a distribution vessel that a sheet metal jacket 2, a refractory lining 3 and one in Vessel bottom 4 arranged spout 5 has. In the vessel 1 there is melt 6 on which a slag blanket 7 floats out of impurities, for example in the form of oxides and a covering powder May exist, which is abandoned to reoxidation and heat radiation from the melt submissions. Basically, it is important to prevent that when filling the distribution vessel 1 with melt 6, resting on non-metallic mass. Slag 7 in the pouring opening 5 and thus over the slide closure 8 and the dip tube 9 enters the continuous casting mold 10. Arrived there would slag 7 deposit on the cold strand 11 and inevitably when the strand withdrawal device is switched on lead to a melt breakthrough.

Deshalb ist in der Auffüllphase des Verteilergefässes 1 die Ausgussöffnung 5 mittels eines koaxial über dieser am Gefässboden 4 angeordneten feuerfesten Startrohres 12 abgesperrt. Zur Absperrung dient ferner ein feuerfester hohlzylindrischer Startkörper 13, der lose auf dem Einlaufende 12a des Startrohres 12 aufliegt und eine geringere Massen-Dichte hat als die zu vergiessende Schmelze 6. Im besonderen stellt der Startkörper 13 eine Verlängerung des Startrohres 12 dar, um zu bewirken, dass im Verteilergefäss 1 ein bestimmter Schmelzepegel 6a mit einer Füllstandshöhe H erreicht wird, ehe der Abfluss von Schmelze 6 über das Startrohr-Einlaufende 12a durch Aufschwimmen des Startkörpers 13 wie strichpunktiert eingezeichnet beginnt. Dementsprechend ist für den Startkörper 13 in Abhängigkeit von seiner Dichte und der Länge des Startrohres 12, als dessen Verlängerung eine angemessene Körperhöhe 13a des Startkörpers 13 erforderlich. Dieser verliert mit dem Ansteigen des Schmelzepegels 6a ständig an Gewicht, steigt aber erst dann auf, wenn die Gefahr des Einlaufens von Schlacke 7 zusammen mit Schmelze 6 nicht mehr besteht. Infolge des sanften Abhebens des Startkörpers 13 beginnt derAbfluss von Schmelze über das Einlaufende 12a des Startrohres 12 ruhig und ausgeglichen, das heisst ohne Abflussturbulenzen, so dass bei Auftriebsbeginn des Startkörpers 13 die Schlackendecke 7 nicht allzu weit vom Einlaufende 12a des Startrohres 12 entfernt zu sein braucht.Therefore, in the filling phase of the distribution vessel 1, the pouring opening 5 is coaxially closed this fireproof starting tube 12 arranged on the vessel bottom 4 is shut off. It also serves as a barrier a refractory hollow cylindrical starting body 13, which rests loosely on the inlet end 12a of the starting tube 12 and has a lower mass density than the melt to be cast 6. In particular, the starting body 13 represents an extension of the start tube 12 in order to cause a certain one in the distribution vessel 1 Melting level 6a with a fill level H is reached before the melt 6 flows out via the start pipe inlet end 12a begins by floating the starting body 13 as shown in broken lines. Accordingly is for the starting body 13 as a function of its density and the length of the starting tube 12 its extension requires an appropriate body height 13a of the starting body 13. This also loses the increase in the melting level 6a constantly in weight, but only increases when the risk of Shrinkage 7 slag together with melt 6 no longer exists. As a result of the gentle lifting of the Starting body 13, the outflow of melt begins calmly and evenly via the inlet end 12a of the starting tube 12, that means without runoff turbulence, so that when the starting body 13 begins to lift, the slag cover 7 need not be too far from the inlet end 12a of the starting tube 12.

Ab der Füllstandshöhe H steigt der Schmelzepegel 6a unter Abfluss von Schmelze 6 durch die Ausgussöffnung 5 in die Kokille weiter an, bis der aus der Zeichnung nicht ersichtliche Sollfüllstand des Verteilergefässes 1 erreicht ist. Danach wird der erreichte Sollfüllstand regeltechnisch gehalten, in Abstimmung mit dem den Zufluss zur Kokille 10 steuemden Schieberverschluss 8 am Ausguss 5 des Verteilergefässes 1.From the fill level H, the melt level 6a rises under the outflow of melt 6 through the pouring opening 5 into the mold until the target fill level of the tundish, not shown in the drawing 1 is reached. Thereafter, the target level is reached in terms of control technology, in coordination with the the flow to the mold 10 controlling slide closure 8 at the spout 5 of the distribution vessel 1.

Im Laufe des meist über mehrere Stunden anhaltenden Giessprozesses, löst sich das aus einem von Schmelze aufzehrbaren Material bestehende Startrohr 12 üblicherweise auf, so dass am Ende des Giessprozesses das Verteilergefäss 1 vollständig geleert werden kann.In the course of the casting process, which usually lasts for several hours, this releases itself from one of Melt consumable material usually existing starting tube 12, so that at the end of the Casting process, the distribution vessel 1 can be completely emptied.

Unterschiedlich zu Fig. 1 ist der aus Fig. 2 ersichtliche Startkörper 15 kappenartig ausgebildet. Er hat eine äussere Führung 15a, die das Einlaufende 16a des Startrohres 16 umgibt und so ein ungewolltes Abrutschen verhindert. Ausserdem wird der Einlauf von Schmelze 6 in das Startrohr 16 im Ringspalt 17 zwischen der Führung 15a und dem Startrohr 16 vergleichmässigt. Aehnlich verhält es sich mit dem Startkörper 18 nach Fig. 3, der auf einem sich zur Ausgussöffnung 5 hin konisch verjüngenden Startrohr 19 aufliegt und dabei mit einer inneren konischen Führung 18a in das Einlaufende 19a hineingreift. Dies wiederum unter Freilassen eines beim Aufschwimmen des Startkörpers 18 sich stetig vergrössernden Ringspaltes 20, in dem eine ebenso stetig grösser werdende Schmelzenmenge fliesst.In contrast to FIG. 1, the starting body 15 shown in FIG. 2 is designed like a cap. He has one outer guide 15a, which surrounds the inlet end 16a of the starting tube 16 and thus an unwanted slipping prevented. In addition, the melt 6 enters the starting tube 16 in the annular gap 17 between the guide 15a and the starting tube 16. 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 with a inner conical guide 18a engages in the inlet end 19a. This in turn, leaving one at Floating of the starter body 18 is an ever-increasing annular gap 20, in which an equally constantly larger one increasing amount of melt flows.

Beim Ausführungsbeispiel nach Fig. 4 ist das Startrohr 21 am Einlaufende 21a mit voreilenden, sägeartigen Einflussdurchtritten 21c und nahe des Gefässbodens 4 mit radialen Abflussöffnungen 21b versehen. Ein rohrförmiger Startkörper 22 umgibt vermittels eines Ringspaltes 23 das Startrohr 21 zentrisch. Dabei sind die Abflussöffnungen 21b von einer am Startkörper 22 angeordneten, den Spalt 23 überbrückenden Dichtung 22a verschlossen, die beispielsweise aus aufgeklebtem keramischem, elastisch nachgiebigem Fasermaterial besteht. Der Startkörper 22 beginnt nach Erreichen der Füllstandshöhe H aufzutreiben und gibt dabei allmählich zuerst die Abflussöffnungen 21b zum Abfluss von Schmelze 6 in die Ausgussöffnung frei. Im weiteren Anstieg des Startkörpers 22 erfolgt dann eine ebenso allmähliche Freigabe von Schmelze 6 am Einlaufende 21a des Startrohres 21 über die sich in Höhenrichtung erweiternden Einflussdurchtritte 21c.4, the starting tube 21 is at the inlet end 21a with leading, saw-like Influence passages 21c and near the vessel bottom 4 provided with radial drain openings 21b. A tubular Starting body 22 surrounds starting tube 21 centrally by means of an annular gap 23. Here are the drainage openings 21b by a seal 22a arranged on the starting body 22 and bridging the gap 23 closed, which consists for example of glued ceramic, resilient fiber material. The starting body 22 begins to float after reaching the fill level H and gradually gives out first the drain openings 21b for the drain of melt 6 into the pouring opening. In the further rise of the starting body 22 then there is an equally gradual release of melt 6 at the inlet end 21a of the Starting tube 21 via the influence passages 21c widening in the height direction.

Zweckentsprechend den Einflussdurchtritten 21c können die Abflussöffnungen 21b als Langlöcher 24 oder als Ringreihen kleinerer Abflussöffnungen 25 ausgebildet sein.According to the influence passages 21c, the drain openings 21b can be elongated holes 24 or be designed as ring rows of smaller discharge openings 25.

Schliesslich findet beim Ausführungsbeispiel nach Fig. 5 ein zur Ausgussöffnung 5 hin konisch erweitertes Startrohr 26 Anwendung, dessen in Gefässboden nähe 4 angeordnete Abflussöffnungen 26b von einem aufgestülpten gleichartig konischen Startkörper 27 unter Nutzung seines Eigengewichtes abgedeckt sind. Hierzu hat der Startkörper 27 innenseitig eine ebenfalls einen Ringspalt 28 überbrückende Dichtfläche 27a, die beim Aufschwimmen des Startkörpers 27 nach erreichtem Schmelzefüllstand H die Abflussöffnungen 26b sanft öffnet. Gleichzeitig erweitert sich genau so sanft der Ringspalt 28 zum Abfluss von Schmelze 6 über das Einlaufende 26a des Startrohres 26.Finally, in the exemplary embodiment according to FIG. 5, there is a conically widened towards the pouring opening 5 Starting tube 26 application, the drain openings 26b arranged in the vessel bottom near 4 from an inverted one equally conical starting body 27 are covered using its own weight. For this on the inside, the starting body 27 has a sealing surface 27a which also bridges an annular gap 28 and which Floating of the starting body 27 after the melt fill level H has been reached gently opens the drain openings 26b. At the same time, the annular gap 28 widens just as gently to allow melt 6 to flow off via the inlet end 26a of the starting tube 26.

Es liegt im Rahmen der Erfindung vorstehend aufgezeigte Elemente der Vorrichtungen auszutauschen, beispielsweise lässt sich der Bereich der Abflussöffnungen 21b des zylindrischen Startkörpers 21 nach Fig. 4 konisch ausbilden, um so eine Setzbasis für eine ebenfalls konisch ausgebildete Dichtung 22a zu schaffen. Ebenso vermag die Vorrichtung nach Fig. 4 ohne Abflussöffnungen 21b und Dichtungen 22a zu arbeiten. Des weiteren kann das Startrohr 26 nach Fig. 5 umgekehrt konisch sein und der Startkörper 27 mit seiner Dichtfläche 27a im Innern des Startrohres 26 wirken.It is within the scope of the invention to replace elements of the devices shown above, for example, the area of the drain openings 21b of the cylindrical starting body 21 according to FIG. 4 Conical, so as 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. Of 5, the starting tube 26 can be conical in reverse and the starting body 27 with its sealing surface 27a act inside the starting tube 26.

Die neue Startvorrichtung lässt sich in der beschriebenen Ausführung auch an Stranggiessanlagen verwenden, die allein mit mit Düsen besetztem Ausguss 5 am Tundish 1 arbeiten.The new starting device can also be used in the described design on continuous casting plants, who work alone with nozzle 5 on the tundish 1.

Claims (9)

  1. Device for the slag-free commencement of pouring of continuous casting installations, with a slide gate valve at the discharge opening of a distributor vessel and a starter tube blocking the inlet of the discharge opening during filling of the vessel with metal melt,
    characterized in that
    a separate starter body (13, 15, 18, 22, 27) of hollow body form, as an extension of the starter tube (12, 16, 19, 21, 26), which floats with rising melt level (6a) from a filling level (H) to permit the outflow of melt, is allocated to the starter tube (12, 16, 19, 21, 26), which starter body movably rests with sealing effect on the inlet end (12a, 16a, 19a) of the starter tube or on radially positioned discharge openings (21b, 26b) located close to the base of the vessel.
  2. Device according to claim 1,
    characterized in that
    the starter body (15 and 18) has a guide (15a and 18a) which defines an annular gap (17 and 20) and extends along the inner and/or outer side of the starter tube (16 and 19).
  3. Device according to claim 2,
    characterized in that
    a starter tube (19) and a starter body (18, 18a) are constructed within one another of the same conicity.
  4. Device according to claim 1,
    characterized in that
    an external tubular starter body (22 and 27) with an annular gap (23 and 28), which projects beyond the inlet end (21a and 26a) of the starter tube (21 and 26) and which bears on the vessel floor (4) or on the starter tube (26) is provided.
  5. Device according to claim 4,
    characterized in that
    a starter tube (26) and a starter body (27) are constructed within one another of the same conicity.
  6. Device according to claims 4 and 5,
    characterized in that
    on the inlet end (21a) the starter tube (21) has leading inflow openings (21c) of broadening cross-section in the buoyancy direction of the starter body.
  7. Device according to claims 4 through 6,
    characterized in that
    discharge openings (24 and 25) are provided whose flow cross-section is increasingly orientated in the buoyancy direction of the starter body (22).
  8. Device according to claim 7,
    characterized in that
    the region of the starter body (22 and 27) opposed to the discharge openings (21b, 24, 25 and 26b) is constructed as a seal (22a and 27a).
  9. Device according to claim 8,
    characterized in that
    an elastic, ceramic fibre seal serves as the seal (22a).
EP90909701A 1989-07-08 1990-06-27 Device for slag-free casting on in continuous casting installations Expired - Lifetime EP0433419B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90909701T ATE90600T1 (en) 1989-07-08 1990-06-27 DEVICE FOR SLAG-FREE CASTING IN CONTINUOUS CASTING PLANTS.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3922549A DE3922549A1 (en) 1989-07-08 1989-07-08 DEVICE FOR LACQUEL-FREE POURING OF CONTINUOUS CASTING PLANTS
DE3922549 1989-07-08
PCT/EP1990/001025 WO1991000788A1 (en) 1989-07-08 1990-06-27 Device for slag-free casting on in continuous casting installations

Publications (3)

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

Family

ID=6384608

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90909701A Expired - Lifetime EP0433419B2 (en) 1989-07-08 1990-06-27 Device for slag-free casting on in continuous casting installations

Country Status (7)

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

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2679162A1 (en) * 1991-07-18 1993-01-22 Siderurgie Fse Inst Rech Device for jet (stream, runner) transfer of liquid metal, particularly from a continuous casting ladle towards a distributor
KR100953623B1 (en) 2002-12-26 2010-04-20 주식회사 포스코 Mold mounted tundish to float inclusion in the continuation cast machine
GB2450896A (en) * 2007-07-10 2009-01-14 Anglo American Platinum Corp Separating apparatus and method for assaying
KR101149183B1 (en) * 2009-05-26 2012-05-25 현대제철 주식회사 Device for preventing impurities from intruding into submerged nozzle
WO2014094157A1 (en) * 2012-12-17 2014-06-26 Polar Sapphire Ltd. A method and apparatus for melting aluminum oxide

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151533C2 (en) * 1981-12-24 1983-11-24 Günter Dr.-Ing. 5750 Menden Altland Extended pouring nozzle for intermediate container
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
DE3701707A1 (en) * 1987-01-22 1989-12-28 Nolde Sylvia Piece of convertible upholstered furniture
DE3701701A1 (en) * 1987-01-22 1988-08-04 Didier Werke Ag START TUBE FOR A MELTING VESSEL
DE8907044U1 (en) * 1989-06-08 1989-08-03 Foseco International Ltd., Birmingham Retention or pouring device for containers for molten metal

Also Published As

Publication number Publication date
JPH04501385A (en) 1992-03-12
DE3922549C2 (en) 1991-07-18
EP0433419A1 (en) 1991-06-26
WO1991000788A1 (en) 1991-01-24
DE3922549A1 (en) 1991-01-10
EP0433419B1 (en) 1993-06-16
ES2043381T3 (en) 1993-12-16
DE59001788D1 (en) 1993-07-22
US5191926A (en) 1993-03-09
CA2035028A1 (en) 1991-01-09

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