EP0433419A1 - Device for slag-free casting on in continuous casting installations. - Google Patents
Device for slag-free casting on in continuous casting installations.Info
- Publication number
- EP0433419A1 EP0433419A1 EP90909701A EP90909701A EP0433419A1 EP 0433419 A1 EP0433419 A1 EP 0433419A1 EP 90909701 A EP90909701 A EP 90909701A EP 90909701 A EP90909701 A EP 90909701A EP 0433419 A1 EP0433419 A1 EP 0433419A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- starting
- tube
- melt
- vessel
- slag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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.
- DE-OS3701707 discloses a fire-resistant starting tube for a melt vessel with an annular groove-shaped predetermined breaking point, which breaks under the influence of burn-through and / or the buoyancy of the melt.
- the broken piece of pipe floats and thus releases the melt to the pouring opening of the vessel through the remaining tube on the bottom of the vessel.
- the release process depends on the functional effectiveness of the predetermined breaking point at a desired point in time. If the predetermined breaking point does not break in time, then the break can be brought about by handling a rod from the outside, which is tedious and time-consuming and complex, particularly in the case of multi-strand systems.
- the sol breaking point can function earlier than intended, so that slag floating on the melt is entrained in 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 starting to pull off of the cold strand.
- cover powder for heat insulation and air shielding of the melt immediately after a melt level has arisen in the distribution vessel. This takes place 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 have to be accepted, which can be the cause of melt deposits or freezes forming in the slide closure.
- 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 tube.
- the starting tube is loosely assigned a separate starting body that floats with rising melt gel from a predetermined fill level to release the melt flow.
- the release of the starter body and thus the release of the melt flow is dependent solely on the buoyancy potential of the starter body, which is determined in selection with the body height and the free length of the start 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 plants is also more timely, more precise and safer in the case of multiple continuous casting plants.
- the melt level which forms in the distributor vessel can be covered at an early stage with a covering powder which keeps the melt warm and prevents it
- the procedure according to the invention is such that a hollow body-shaped starter body lies loosely on its inlet end in the extension of the starter tube.
- a hollow cylindrical body is preferred, which is inexpensive to manufacture and can be effectively heated up 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.
- 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 and resting on the inlet end of the starting tube, a tubular starting body protruding on the inside or outside with an annular gap is provided, the can support tubular starting body on the bottom of the vessel or on the starting tube.
- a starting body provided with a guide on the starting tube and in the case of a tubular starting body the starting tube and the starting body can be conically formed in the same way. For this reason, the annular gap between the starting tube and the starting body becomes larger in accordance with the rate of rise of the starting body, which accommodates a smooth melt flow over the inlet end of the starting tube.
- the smoother flow of melt via the inlet end of the starting tube also serves the suggestion that leading passages leading in cross-section, widening in cross-section in the direction of lift of the starting body, are provided at the inlet end of the starting tube.
- radia outflow openings covered by the tubular starting body can be arranged, the flow rate of which increases the direction of lift of the starting body. Accordingly, when the starting body rises, the outflow through the outflow openings is first released and then the outflow at the inlet end of the starting pipe.
- the invention also proposes that the area of the starting body opposite the drain openings is designed as a seal, preferably as an inherently elastic ceramic fiber seal, which also contributes to the functionally correct operation of the device.
- FIG. 1 The schematic diagram of a continuous caster and d Fig. 2 to 5 different embodiments of the Angiessvo direction, wherein Figs. 4 and 5 are drawn on a somewhat larger scale
- a molten steel stream A flows from a regulated spout of a ladle (not shown) into a distribution 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.
- 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.
- 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.
- the starting body 13 represents an extension of the starting tube 12 in order to cause that a certain Schme 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 starting body 13 as shown in broken lines. Accordingly, an appropriate body height 13a of the starting body 13 is required for the starting body, depending on its density and the length of the starting body 12, as its extension. This steadily loses weight as the melt level 6a rises and only increases when the risk of slag running in together with the melt 6 no longer exists.
- the melt level 6a continues to rise under the outflow of the melt 6 through the pouring opening 5 into the mold, until the desired fill level of the distribution vessel 1, which is not shown in the drawing, is reached. Thereafter, the target fill level reached is maintained in terms of control technology, i 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 pipe 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 distributor 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 inflow of melt 6 into the starting tube 16 in the annular gap 17 between the guide 15a and the starting tube 16 is similar.
- 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 again with the release of an annular gap 20 which increases continuously when the starting body 18 floats, in which an equally continuously increasing amount of melt flows.
- the starting pipe 21 is provided at the inlet end 21a with leading, saw-like influence passages 21c 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 outflow 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 After reaching the fill level, the starting body 22 begins to float and gradually first releases the drain openings 21b for the melt 6 to drain into the pouring openings.
- melt 6 is then also released gradually at the inlet end 21a of the starting tube 21 via the influence passages 21c widening in the vertical direction.
- the drain openings 21b can be designed as elongated holes 24 or as rows of rings of smaller drain openings 25.
- a starting tube 26 which is conically widened towards the pouring opening 5, the outlet openings 26b of which are arranged near the bottom 4 of the vessel are covered by a similarly conical starting body 27 which is turned on 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 has been reached.
- the annular gap 28 widens just as gently to allow melt to flow away via the inlet end 26a of the starting tube 26.
- the region of the discharge 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 work without drain openings 21b and seals 22a.
- the startro 26 according to FIG. 5 can be conical in reverse, and the start body 27 with its sealing surface 27a acts inside the start tube 26
- the new starting device can also be used on continuous casting plants which work on the tundish 1 solely with nozzle-filled spout 5.
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).A device comprises a usual starting pipe at the entrance of a discharge port (5) of a dispensing container and a separate starting body, loosely associated with said starting pipe, which floats on the cast iron (6). when it reaches the desired filling height (H). The operation of the device is thus improved with simple means and automatically allows the slag-free cast iron to flow in time through the starting pipe (12).
Description
Vorrichtung zum schlackenfreien Angiessen von StranggiessanlagDevice for slag-free casting of continuous casting plant
Beschreibung: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 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.
Derartige Vorrichtungen haben zum Ziel nur saubere Schmelze mit möglichst hoher Temperatur bzw. ohne allzugrosse Abkühlung verluste in die Ausgussöffnung des Verteilergefässes und damit durch den Schieberverschluss in die Kokille gelangen zu lassenThe aim of such devices is only to let clean melt with the highest possible temperature or without excessive cooling losses in the pouring opening of the distribution vessel and thus to get into the mold through the slide closure
Aus der DE-OS3701707 ist für ein Schmelzengefäss ein feuerfest 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 Heg zur Ausgussöffnung des Gefässe 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 rouss der Bruch durch Handhabung einer Stange von aussen herbei geführt werden, was mühsam und besonders bei mehrsträngigen An lagen zeitraubend und aufwendig ist. Andererseits kann die Sol bruchstelle früher als beabsichtigt funktionieren, so dass auf der Schmelze schwimmende Schlacke in die Ausgussöffnung mitger sen und über dem Kaltstrangkopf in der Kokille abgelagert wird Solche nichtmetallische Nester in der Kokille bedeuten stets e mit dem Durchbruch von Schmelze verbundenes Risiko beim Abzieh beginn des Kaltεtranges.
Deshalb wird in der Praxis meistens darauf verzichtet unmitte nach Entstehen eines Schmelzepegels im Verteilergefäss Abdeck pulver zur Wärmeisolierung und Luftabschirmung der Schmelze aufzubringen. Dies geschieht erst nach dem Freigeben des Schmelzeflusses mittels des Startrohres, so dass ein erheblic Wärmeverlust und Reoxidation der Schmelze in Kauf genommen we muss, was die Ursachen für sich im Schieberverschluss bildend Schmelzeablagerungen bzw. Einfrierungen sein können.DE-OS3701707 discloses a fire-resistant starting tube for a melt vessel with an annular groove-shaped predetermined breaking point, which breaks under the influence of burn-through and / or the buoyancy of the melt. The broken piece of pipe floats and thus releases the melt to the pouring opening of the vessel through the remaining tube on the bottom of the vessel. The release process depends on the functional effectiveness of the predetermined breaking point at a desired point in time. If the predetermined breaking point does not break in time, then the break can be brought about by handling a rod from the outside, which is tedious and time-consuming and complex, particularly in the case of multi-strand systems. On the other hand, the sol breaking point can function earlier than intended, so that slag floating on the melt is entrained in 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 starting to pull off of the cold strand. For this reason, in practice, it is mostly not necessary to apply cover powder for heat insulation and air shielding of the melt immediately after a melt level has arisen in the distribution vessel. This takes place 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 have to be accepted, which can be the cause of melt deposits or freezes forming in the slide closure.
Aufgabe vorliegender Erfindung ist es Startvorrichtungen der besagten Art wirkungsmässig zu verbessern 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, to enable timely release of slag-free melt on the starting tube.
Die gestellte Aufgabe wird gemäss der Erfindung im wesentlich dadurch gelöst, dass dem Startrohr ein separater, mit steigen Schmelzepe,gel ab einer vorbestimmten Füllεtandshöhe zur Freig des Schmelzeflusses aufschwimmender Startkörper lose zugeordn ist. 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 Gegensa zu einer Vorrichtung, bei der ein lösbarer Teil an einem fest stehenden Teil mittels einer zu zerstörenden Verbindung ange¬ ordnet ist. Im ganzen gesehen, wird das Angiessen von Strang¬ giessanlagen auch bei Mehrstranggiessanlagen zeitgerechter, genauer und sicherer. Darüberhinaus kann der im Verteiler¬ gefäss sich bildende Schmelzepegel frühzeitig mit einem Ab¬ deckpulver belegt werden, das die Schmelze warm hält und damiThe object is achieved according to the invention essentially in that the starting tube is loosely assigned a separate starting body that floats with rising melt gel from a predetermined fill level to release the melt flow. In this way, the release of the starter body and thus the release of the melt flow is dependent solely on the buoyancy potential of the starter body, which is determined in selection with the body height and the free length of the start tube. This means that 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 plants is also more timely, more precise and safer in the case of multiple continuous casting plants. In addition, the melt level which forms in the distributor vessel can be covered at an early stage with a covering powder which keeps the melt warm and prevents it
Einfrierungen im Schieberverschluss vorbeugt, ohne das einPrevents freezing in the slide lock without the one
Abfliessen von Schlacke, Abdeckpulver zusammen mit der Schmel in die Kokille zu befürchten ist.
Im einzelnen wird gemäss der Erfindung so vorgegangen, dass ein hohlkörperförmiger Startkörper in Verlängerung des Start rohres lose auf dessem Einlaufende aufliegt. Dazu bietet sich vorzugsweise ein hohlzylindrischer Körper an, der her- stellungsmässig günstig ist und sich vor dem Einsatz gemeins 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 ferner darin zu sehen, dass anstelle eines gegebenen¬ falls mit einer Führung ausgerüsteten, auf dem Einlaufende des Startrohres aufliegenden Startkörpers ein das Startrohr überragender, innen- oder aussenseitiger rohrförmiger Start¬ körper mit Ringspalt vorgesehen ist, wobei sich der rohr- förmige Startkörper auf dem Gefässboden oder auf dem Start¬ rohr abstützen kann. Sowohl bei einem auf dem Startrohr auf¬ liegenden mit einer Führung versehenen Startkörper, als auch bei einem rohrförmigen Startkörper lassen sich Startrohr und Startkörper in einander gleichartig konisch ausbilden. Dadur wird der Ringspalt zwischen Startrohr und Startkörper nach Massgabe der Steiggeschwindigkeit des Startkörperε grösser, was einem sanften Ablauf von Schmelze über das Einlaufende des Startrohres entgegenkommt.Drainage of slag, covering powder together with the melt in the mold is to be feared. In detail, the procedure according to the invention is such that a hollow body-shaped starter body lies loosely on its inlet end in the extension of the starter tube. For this purpose, a hollow cylindrical body is preferred, which is inexpensive to manufacture and can be effectively heated up 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. 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 and resting on the inlet end of the starting tube, a tubular starting body protruding on the inside or outside with an annular gap is provided, the can support tubular starting body on the bottom of the vessel or on the starting tube. Both in the case of a starting body provided with a guide on the starting tube and in the case of a tubular starting body, the starting tube and the starting body can be conically formed in the same way. For this reason, the annular gap between the starting tube and the starting body becomes larger in accordance with the rate of rise of the starting body, which accommodates a smooth melt flow over the inlet end of the starting tube.
Dem sanfteren Ablauf von Schmelze über das Einlaufende des Startrohres vornehmlich bei rohrförmigen Startkörpern dient auch der Vorschlag, dass am Einlaufende des Startrohres vort eilende, im Querschnitt sich in Auftriebsrichtung des Start körpers erweiternde Einflussdurchtritte vorgesehen sind. Zu können zum sanfteren Abfluss von Schmelze im Startrohr nahe Gefässbodens vom rohrförmigen Startkörper abgedeckte, radia Abflussöffnungen angeordnet sein, deren Durchflussguerschni Auftriebsrichtung des Startkörpers stetig grösser wird.
Dementsprechend wird beim Ansteigen des Startkörpers zunächst der Abfluss durch die Abflussöffnungen und folgend der Abflus am Einlaufende des Startrohres frei. Damit zusammenhängend schlägt die Erfindung ferner vor, das der den Abflussöffnunge gegenüberliegende Bereich des Startkσrpers als Dichtung, vor¬ zugsweise als in sich elastische keramische Faserdichtung ausgebildet ist, was zusätzlich zu einem funktionsgerechten Arbeiten der Vorrichtung beiträgt.The smoother flow of melt via the inlet end of the starting tube, especially in the case of tubular starting bodies, also serves the suggestion that leading passages leading in cross-section, widening in cross-section in the direction of lift of the starting body, are provided at the inlet end of the starting tube. In order to allow melt to flow away more gently in the starting tube near the bottom of the vessel, radia outflow openings covered by the tubular starting body can be arranged, the flow rate of which increases the direction of lift of the starting body. Accordingly, when the starting body rises, the outflow through the outflow openings is first released and then the outflow at the inlet end of the starting pipe. In connection with this, the invention also proposes that the area of the starting body opposite the drain openings is designed as a seal, preferably as an inherently elastic ceramic fiber seal, which also contributes to the functionally correct operation of the device.
Die Erfindung ist nachstehend anhand der Zeichnung erläutert. Es zeigen in geschnittener Darstellung:The invention is explained below with reference to the drawing. In a cut representation:
Fig. 1 Das Prinzipschema einer Stranggiessanlage und d Fig. 2 bis 5 verschiedene Ausführungsbeispiele der Angiessvo richtung, wobei die Fig. 4 und 5 in einem etwas grösseren Massstab gezeichnet siFig. 1 The schematic diagram of a continuous caster and d Fig. 2 to 5 different embodiments of the Angiessvo direction, wherein Figs. 4 and 5 are drawn on a somewhat larger scale
Gemäss Fig. 1 fliesst aus einem geregelten Ausguss einer nich dargestellten Giesspfanne ein Stahlschmelzestrom A in ein Ver teilergefäss, das einen Blechmantel 2, eine feuerfeste Aus¬ kleidung 3 und eine im Gefässboden 4 angeordnete Ausgussöffnu 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 Wärmeabstrah- lungen der Schmelze vorzubeugen. Grundsätzlich gilt es, zu verhindern, dass beim Auffüllen des Verteilergefässes 1 mit Schmelze 6," aufliegende nicht metallische Masse bezw. Schlack in die Ausgussöffnung 5 und damit über den Schieberverschluss und das Taüchrohr 9 in die Stranggiesskokille 0 gelangt. Dor angekommene Schlacke 7 würde sich über dem Kaltstrang 11 ab¬ lagern und beim Einschalten der Strangabzugsvorrichtung un¬ weigerlich*zu einem Schmelzedurchbruch führen.
Deshalb ist in der Auffüllphase des Verteilergefässes 1 die Ausgussöffnung 5 mittels eines koaxial über dieser am Gefäs boden 4 angeordneten feuerfesten Startrohres 12 abgesperrt. Absperrung dient ferner ein feuerfester hohlzylindrischer Startkörper 13, der lose auf dem Einlaufende 12a des Start¬ rohres 12 aufliegt und eine geringere Massen-Dichte hat als die zu vergiessende Schmelze 6. Im besonderen stellt de Startkörper 13 eine Verlängerung des Startrohres 12 dar, um zu bewirken, dass im Verteilergefäss 1 ein bestimmter Schme pegel 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 gezeichnet beginnt. Dementsprechend ist für den Startkörper in Abhängigkeit von seiner Dichte und der Länge des Startro 12, als dessen Verlängerung eine angemessene Körperhöhe 13a des Startkörpers 13 erforderlich. Dieser verliert mit dem Ansteigen des Schmelzepegels 6a ständig an Gewicht, steigt erst dann auf, wenn die Gefahr des Einlaufens von Schlacke zusammen mit Schmelze 6 nicht mehr besteht. Infolge des san Abhebens des Startkörpers 13 beginnt der Abfluss von Schmel über das Einlaufende 12a des Startrohres 12 ruhig und ausge glichen, das heisst ohne Abflussturbulenzen, so dass bei Au triebsbeginn des Startkörpers 13 die Schlackendecke 7 nicht allzu weit vom Einlaufende 12a des Startrohres 12 entfernt zu sein braucht.1, a molten steel stream A flows from a regulated spout of a ladle (not shown) into a distribution 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. In the vessel 1 there is 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. Basically, it is important to prevent that, when the distributor vessel 1 is filled with melt 6, " non-metallic mass or slag lying thereon does not get into the pouring opening 5 and thus through the slide closure and the immersion tube 9 into the continuous casting mold 0. Slag 7 that has arrived would become store ab¬ on the dummy bar 11 and un¬ evitably * lead when switching on the strand removal device to a melt breakthrough. Therefore, in the filling phase of the distribution vessel 1, the pouring opening 5 is blocked off by means of a refractory starting tube 12 arranged coaxially above the bottom 4 of the vessel. Shut-off also serves a fireproof hollow cylindrical starting body 13 which lies loosely on the inlet end 12a of the starting tube 12 and has a lower mass density than the melt 6 to be cast. In particular, the starting body 13 represents an extension of the starting tube 12 in order to cause that a certain Schme 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 starting body 13 as shown in broken lines. Accordingly, an appropriate body height 13a of the starting body 13 is required for the starting body, depending on its density and the length of the starting body 12, as its extension. This steadily loses weight as the melt level 6a rises and only increases when the risk of slag running in together with the melt 6 no longer exists. As a result of the lifting off of the starter body 13, the outflow of melt via the inlet end 12a of the starter tube 12 begins calmly and completely, that is to say without outflow turbulence, so that when the starter body 13 starts driving, the slag cover 7 is not too far from the inlet end 12a of the starter tube 12 needs to be.
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 ersichtl Sollfüllstand des Verteilergefässes 1 erreicht ist. Danach wird der erreichte Sollfüllstand regeltechnisch gehalten, i Abstimmung mit dem den Zufluss zur Kokille 10 steuernden Schieberverschluss 8 am Ausguss 5 des Verteilergefässes 1.
Im Laufe des meist über mehrere Stunden anhaltenden Giess- prozeases, löst sich das aus einem von Schmelze aufzehrbaren Material bestehende Startrohr 12 üblicherweise auf, so dass am Ende des Giessprozesses das Verteilergefäss 1 vollständig ge¬ leert werden kann.From the fill level H, the melt level 6a continues to rise under the outflow of the melt 6 through the pouring opening 5 into the mold, until the desired fill level of the distribution vessel 1, which is not shown in the drawing, is reached. Thereafter, the target fill level reached is maintained in terms of control technology, i coordination with the slide closure 8 on the spout 5 of the distribution vessel 1, which controls the inflow to the mold 10. In the course of the casting process, which usually lasts for several hours, the starting pipe 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 distributor 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. Ausserdero 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 verjüngend Startrohr 19 aufliegt und dabei mit einer inneren konischen Führung 18a in das Einlaufende 19a hineingreift. Dies wiederu 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. It has an outer guide 15a, which surrounds the inlet end 16a of the starting tube 16 and thus prevents undesired slipping. In addition, the inflow of melt 6 into the starting tube 16 in the annular gap 17 between the guide 15a and the starting tube 16 is similar. 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 again with the release of an annular gap 20 which increases continuously when the starting body 18 floats, in which an equally continuously increasing amount of melt flows.
Beim Ausführungsbeispiel nach Fig. 4 ist das Startrohr 21 am Einlaufende 21a mit voreilenden, sägeartigen Einfluss- durchtritten 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 aufgeklebte keramischem, elastisch nachgiebigem Fasermaterial besteht. Der Startkörper 22 beginnt nach Erreichen der Füllstandshöhe aufzutreiben und gibt dabei allmählich zuerst die Abfluss¬ öffnungen 21b zum Abfluss von Schmelze 6 in die Ausgussöffnun frei. Im weiteren Anstieg des Startkörpers 22 erfolgt dann eine ebenso allmähliche Freigabe von Schmelze 6 am Einlaufend 21a des Startrohres 21 über die sich in Höhenrichtung erweit¬ ernden Einflussdurchtritte 21c.
Zweckentsprechend den Einflussdurchtritten 21c können die Ab¬ flussöffnungen 21b als Langlöcher 24 oder als Ringreihen kleinerer Abflussöffnungen 25 ausgebildet sein.In the exemplary embodiment according to FIG. 4, the starting pipe 21 is provided at the inlet end 21a with leading, saw-like influence passages 21c 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 outflow 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. After reaching the fill level, the starting body 22 begins to float and gradually first releases the drain openings 21b for the melt 6 to drain into the pouring openings. In the further rise of the starting body 22, melt 6 is then also released gradually at the inlet end 21a of the starting tube 21 via the influence passages 21c widening in the vertical direction. In accordance with the influence passages 21c, the drain openings 21b can be designed as elongated holes 24 or as rows of rings of smaller drain openings 25.
Schliesslich findet beim Ausführungsbeispiel nach Fig. 5 ein zur Ausgussöffnung 5 hin konisch erweitertes Startrohr 26 An¬ wendung, dessen in Gefässboden nähe 4 angeordnete Abfluss¬ öffnungen 26b von einem aufgestülpten gleichartig konischen Startkörper 27 unter Nutzung seines Eigengewichtes abgedeckt sind. Hierzu hat der Startkörper 27 innenseitig eine ebenfall einen Ringspalt 28 überbrückende Dichtfläche 27a, die beim Au schwimmen des Startkörpers 27 nach erreichtem Schmelzefüllsta die Abflussöffnungen 26b sanft öffnet. Gleichzeitig erweitert sich genau so sanft der Ringspalt 28 zum Abfluss von Schmelze über das Einlaufende 26a des Startrohres 26.Finally, in the exemplary embodiment according to FIG. 5, a starting tube 26 is used which is conically widened towards the pouring opening 5, the outlet openings 26b of which are arranged near the bottom 4 of the vessel are covered by a similarly conical starting body 27 which is turned on using its own weight. For this purpose, 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 has been reached. At the same time, the annular gap 28 widens just as gently to allow melt to flow away via the inlet end 26a of the starting tube 26.
Es liegt im Rahmen der Erfindung vorstehend aufgezeigte Eleme der Vorrichtungen auszutauschen, beispielsweise lässt sich de Bereich der Abflussö fnungen 21b des zylindrischen Startkörpe 21 nach Fig. 4 konisch ausbilden, um so eine Setzbasis für ei ebenfalls konisch ausgebildete Dichtung 22a zu schaffen. Eben vermag die Vorrichtung nach Fig. 4 ohne Abflussöffnungen 21b und Dichtungen 22a zu arbeiten. Des weiteren kann das Startro 26 nach Fig. 5 umgekehrt konisch sein und der Startkörper 27 mit seiner Dichtfläche 27a im Innern des Startrohres 26 wirkeIt is within the scope of the invention to replace the elements of the devices shown above, for example the region of the discharge 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 work without drain openings 21b and seals 22a. Furthermore, the startro 26 according to FIG. 5 can be conical in reverse, and the start body 27 with its sealing surface 27a acts inside the start tube 26
Die neue Startvorrichtung lässt sich in der beschriebenen Aus führung auch an Stranggiessanlagen verwenden, die allein mit Düsen besetztem Ausguss 5 am Tundish 1 arbeiten.
In the described embodiment, the new starting device can also be used on continuous casting plants which work on the tundish 1 solely with nozzle-filled spout 5.
Claims
1. Vorrichtung zum schlackenfreien Angiessen von Stranggiessa lagen, insbesondere mit einem Schieberverschluss an der Ausgusεöffnung eines Verteilergefäsεes (Tundish) und eine beim Auffüllen des Gefässes mit Metallschmelze den Einlauf der Ausgussöffnung absperrenden Startrohr, dadurch gekenn¬ zeichnet, dass dem Startrohr (12, 16, 19, 21 und 26) ein separater, mit steigendem Schmelzepegel (6a) ab einer Füll standshöhe (H) zur Freigabe des Schmelzeabflusses aufschwi mender Startkörper (13, 15, 18, 22 und 27) lose zugeordnet ist.1. The device for slag-free casting of continuous casting lay, in particular with a slide closure on the pouring opening of a distributor vessel (tundish), and a starting tube which blocks the inlet of the pouring opening when the vessel is filled with molten metal, characterized in that the starting tube (12, 16, 19, 21 and 26) a separate, with increasing melt level (6a) from a fill level (H) to release the melt flow floating start body (13, 15, 18, 22 and 27) is loosely assigned.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass ein hohjkörperförmiger Startkörper (13, 15 und 18) in Verlängerung des Startrohres (12, 16 und 19) auf deεsem Einlaufende (12a, 16a und 19a) lose aufliegt.2. Device according to claim 1, characterized in that a hollow body-shaped starting body (13, 15 and 18) in extension of the starting tube (12, 16 and 19) rests loosely on its inlet end (12a, 16a and 19a).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Startkörper (15 und 18) eine entlang der Innen- und/oder Aussenseite des Startrohres (16 und 19) ver¬ laufende, einen Ringspalt (17 und 20) bildende Führung <15a und 18a) hat.3. Apparatus according to claim 2, characterized in that the starting body (15 and 18) runs along the inside and / or outside of the starting tube (16 and 19), forming an annular gap (17 and 20) guide <15a and 18a).
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass ein das Einlaufende (21a und 26a) des Startrohres (21 und 26) überragender innen- oder aussenseitiger, rohrförmiger Startkörper (22 und 27) mit Ringspalt (23 un 28) vorgesehen ist, der sich am Gefässboden (4) oder am Startrohr (26) abstützt. - 9 -4. The device according to claim 1, characterized in that a the inlet end (21a and 26a) of the starting tube (21 and 26) projecting inside or outside, tubular starting body (22 and 27) with an annular gap (23 and 28) is provided is supported on the vessel bottom (4) or on the start tube (26). - 9 -
5. Vorrichtung nach Anspruch 3 und 4, dadurch gekennzeichne dass ein Startrohr (19 und 26) und ein Startkörper (18, und 27) ineinander gleichartig konisch ausgebildet sind.5. Apparatus according to claim 3 and 4, characterized in that a starting tube (19 and 26) and a starting body (18, and 27 ) are conical in the same manner.
6. Vorrichtung nach Anspruch 4 und 5, dadurch gekennzeichne dass das Startrohr (21) am Einlaufende (21a) voreilende, im Querschnitt sich in Auftriebsrichtung des Startkörper erweiternde Einflussdurchtritte (21c) aufweist.6. The device according to claim 4 and 5, characterized in that the starting tube (21) at the inlet end (21a) has leading, in cross-section widening in the lift direction of the starter body through passages (21c).
7. Vorrichtung nach den Ansprüchen 4 bis 6, dadurch gekenn¬ zeichnet, dass im Startrohr (21 und 26) nahe des Gefäss- bodens (4) vom Startkörper (22 und 27) abgedeckte radial Abflussöffnungen (21b und 26b) angeordnet sind.7. Device according to claims 4 to 6, characterized gekenn¬ characterized in that in the starting tube (21 and 26) near the vessel bottom (4) from the starting body (22 and 27) covered radially drainage openings (21b and 26b) are arranged.
8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, das in AufSchwimmrichtung des Startkörpers (22) im Durchflus guerschnitt zunehmend orientierte Abflussöffnungen (24 u 25) vorgesehen sind.8. The device according to claim 7, characterized in that in the floating direction of the starting body (22) in the flow cross section increasingly oriented drain openings (24 and 25) are provided.
9. Vorrichtung nach den Ansprüchen 7 und 8, dadurch gekenn¬ zeichnet, dass der den Abflussöffnungen (21b, 24, 25 und 26b) gegenüberliegende Bereich des Startkörpers (22 und 27) als Dichtung (22a und 27a) ausgebildet ist.9. Device according to claims 7 and 8, characterized gekenn¬ characterized in that the drain openings (21b, 24, 25 and 26b) opposite area of the starting body (22 and 27) is designed as a seal (22a and 27a).
10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, da als Dichtung (22a) eine in sich elastische keramische Faserdichtung dient.10. The device according to claim 9, characterized in that an inherently elastic ceramic fiber seal serves as the seal (22a).
ERSATZBLATT REPLACEMENT LEAF
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 true EP0433419A1 (en) | 1991-06-26 |
| EP0433419B1 EP0433419B1 (en) | 1993-06-16 |
| EP0433419B2 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)
| 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)
| 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 |
-
1989
- 1989-07-08 DE DE3922549A patent/DE3922549A1/en active Granted
-
1990
- 1990-06-27 US US07/659,334 patent/US5191926A/en not_active Expired - Fee Related
- 1990-06-27 CA CA002035028A patent/CA2035028A1/en not_active Abandoned
- 1990-06-27 EP EP90909701A patent/EP0433419B2/en not_active Expired - Lifetime
- 1990-06-27 WO PCT/EP1990/001025 patent/WO1991000788A1/en active IP Right Grant
- 1990-06-27 DE DE9090909701T patent/DE59001788D1/en not_active Expired - Fee Related
- 1990-06-27 JP JP2509033A patent/JPH04501385A/en active Pending
- 1990-06-27 ES ES90909701T patent/ES2043381T3/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9100788A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO1991000788A1 (en) | 1991-01-24 |
| EP0433419B1 (en) | 1993-06-16 |
| DE59001788D1 (en) | 1993-07-22 |
| US5191926A (en) | 1993-03-09 |
| DE3922549C2 (en) | 1991-07-18 |
| ES2043381T3 (en) | 1993-12-16 |
| CA2035028A1 (en) | 1991-01-09 |
| DE3922549A1 (en) | 1991-01-10 |
| EP0433419B2 (en) | 2002-06-05 |
| JPH04501385A (en) | 1992-03-12 |
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