EP2598268B1 - Melt charging system for strip casting - Google Patents

Melt charging system for strip casting Download PDF

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Publication number
EP2598268B1
EP2598268B1 EP11740894.8A EP11740894A EP2598268B1 EP 2598268 B1 EP2598268 B1 EP 2598268B1 EP 11740894 A EP11740894 A EP 11740894A EP 2598268 B1 EP2598268 B1 EP 2598268B1
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EP
European Patent Office
Prior art keywords
nozzle
melt
heating
delivery system
outlet element
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EP11740894.8A
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German (de)
French (fr)
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EP2598268A1 (en
Inventor
Jörg BAUSCH
Reiner PÜRLING
Jochen SCHLÜTER
Jochen Wans
Karl-Heinz Spitzer
Hellfried Eichholz
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SMS Group GmbH
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SMS Group GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt
    • 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
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0642—Nozzles

Definitions

  • the invention relates to a melt feeding system for horizontal strip casting of a molten metal with a discharge element, in particular with a pouring nozzle for the free overflow of the molten metal, hereinafter referred to as "nozzle", and with at least one arranged in the region of the outlet element heater for heating the Outlet element according to the preamble of patent claim 1.
  • the horizontal strip casting of metals which is also referred to as direct strip casting and BCT (Band Casting Technology), is used for example in steel, for example, with a close to final casting in combination with an offline or an inline rolling.
  • the forming or rolling step has both the purpose of reducing the thickness and the structure formation, ie the recrystallization. It is a process aimed at the production of hot rolled strip for steel alloys.
  • liquid steel is fed by a feed system with a correspondingly formed nozzle onto a circulating transport belt cooled from below with water.
  • the melt addition during horizontal strip casting takes place via the melt feed vessel or feed system.
  • the melt flows through a filling area and then an outlet area before it passes through a ceramic component, such as a nozzle with a free overflow on the conveyor belt.
  • the conveyor belt is driven and guided by two pulleys.
  • the melt applied to the conveyor belt solidifies completely in the area of the primary cooling. After solidification, the strip enters inline rolling in rolling stands. After inline rolling and another cooling process, the belt is rewound.
  • Such a casting method for strip casting is from the DE 198 52 275 A1 known.
  • Other melt dispensing systems are out US 4 619 309 A1 and DE10 2004 015 713 A1 known.
  • this object is achieved in a melt delivery system of the type mentioned, as indicated in claim.
  • an active heating of the outlet element ie the nozzle
  • the area close to the nozzle is also heated.
  • the outlet element itself is equipped with the heating device, or the heating device is arranged adjacent to the outlet element.
  • the outlet element is at least partially formed of a refractory ceramic.
  • the heater is designed for example as a gas heater.
  • the heater is arranged or integrated in a floor, in side walls, in a weir, a dam, an overflow and / or in a cover of the outlet element or the nozzle.
  • the heating device in particular in the form of heating rods, is preferably arranged in recesses or grooves in the bottom and / or in the cover.
  • the heating device is surrounded by ceramic components. These can be used in different geometries.
  • the heating elements are designed as carbide heating rods, in particular as lithium carbide or as silicon carbide heating rods.
  • the configured with at least one pore burner heater can be infinitely and quickly controlled over wide areas.
  • the pore burner can be operated with a liquid heating medium, but preferably with a gas. It comes with simultaneous delivery of a combustible fluid and air to a combustion reaction in a ceramic foam.
  • the pore burner can thus a Düsenunter- and / or -obererteil fill in whole or in part by area. Due to the high surface power density that can be achieved with the pore burner, this can be operated as a compact burner unit.
  • the infinitely variable burner output makes it possible to provide the required burner heat in a finely dosed manner in order to adapt the nozzle surfaces to the melt parameters required in the respective melting process.
  • inductive heating means are advantageously used, for. B. WS “Inducer” Fa. RHI.
  • the coil geometry should be adapted to the ceramic component to be heated in order to ensure rapid and uniform heating.
  • the ceramic should also have sufficient electrical conductivity to provide a short warm-up time, preferably about 10 minutes, together with the required power density.
  • the melt delivery system provides a unit for supplying an inert gas to the strand of the metal strip to be cast in the region of the outlet element.
  • the radiation also heats the ceramic. Only suitable cooling measures must be taken for the conveyor belt, over which the cast metal strip is removed. Likewise, heating elements can be integrated in the bottom of the nozzle, in particular in the region of an overflow, in a dam, a weir or in the side walls of the nozzle.
  • the invention also has the advantage that the casting process becomes more robust against time and temperature losses.
  • the casting can also be done over a longer period.
  • the furnace 2 can be opened down to a tapping channel 5.
  • the stopper rod 4 is mounted in the closed state relative to a sealing ring 6.
  • the melt flows into a preferably also heated or insulated task vessel 7. From this, the melt via an outlet channel 8, which ends in an outlet region, in particular in a nozzle 9.
  • the nozzle 9 is equipped with a dam 10 and a weir 11 to channel the flow of the melt.
  • a gas nozzle 12 is provided, which generates a flow of an inert gas opposite to the flow direction of the melt in order to distribute the melt, preferably also transversely to the casting direction, and / or to prevent superficial corrosion of the solidifying melt.
  • the conveyor belt 13 passes over a deflection or drive roller 15. Further, the conveyor belt 13 is guided via support rollers 16 and / or a honeycomb grid. Between them, spray nozzles 17 are arranged, which spray a cooling medium taken from a basin 18 onto the underside of the conveyor belt 13 in order to solidify the metal strip 14.
  • this follower forming segments on the two narrow narrow sides of the conveyor belt 13, which are arranged overlapping each other or closely adjacent to each other to prevent leakage of the solidifying metal.
  • the distance of the segments is either predetermined by the width of the conveyor belt 13 or adjustable according to the desired width.
  • a nozzle 9 constructed like the nozzle 9 and therefore provided with the same reference numeral 9 (FIG. Fig. 2 ) is provided with heating elements in several places in order to provide a constant ambient temperature for the melt through the surfaces adjacent to the molten metal.
  • 20 heating devices are provided both in the nozzle upper part 19 and in the nozzle lower part.
  • two heaters 21, 22 are arranged one behind the other in the flow direction of the melt.
  • Each of the heating devices 21, 22 comprises a heating rod 24 mounted in a ceramic tube 23.
  • a heating rod 26 is also mounted in a front weir 25 of the nozzle 11.
  • the weir is preferably designed inside as a ceramic tube.
  • the heating element 26 may be integrated in the ceramic tube.
  • the weir 25 controls the outflow of the melt from the nozzle 9.
  • a heating element 28 is housed in the nozzle lower part 20 in a ceramic tube 27, a heating element 28 is housed.
  • the heating rods 24, 26, 28 are made of silicon or lithium carbide, for example.
  • a nozzle 30 (FIG. Fig. 3 ) with a lower part 31 and an upper part 32 are on the upper side heating rods 33, 34 formed as ohmic resistance heaters and extend transversely to the flow direction of the melt, which leaves the nozzle via a dam 35.
  • the nozzle top and bottom parts 19, 20 and 31, 32 are constructed, for example, completely made of a refractory ceramic.
  • the refractory ceramic may be provided with recesses into which ceramic-sheathed heating elements are introduced, such as the heating rods 33, 34.
  • the nozzle top and bottom parts 19, 20 and 31, 32 may also consist of a metal having a sufficiently higher melting temperature.
  • the nozzle tops and bottoms 19, 20 and 31, 32 may also be wholly or partially made of a steel, for example a stainless steel, with respect to use adapted properties, in particular with regard to the corrosivity, wherein also in this case heating rods can be introduced with ceramic sheaths in corresponding recesses in the nozzle top and bottom parts.
  • the arrow S in the Figures 2 and 3 denotes the flow direction of the melt.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Continuous Casting (AREA)
  • Furnace Details (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Coating With Molten Metal (AREA)

Description

Die Erfindung bezieht sich auf ein Schmelzenaufgabesystem zum horizontalen Bandgießen eines schmelzflüssigen Metalls mit einem Auslaufelement, insbesondere mit einer Gießdüse für den freien Überlauf des schmelzflüssigen Metalls, im Weiteren mit "Düse" bezeichnet, und mit wenigstens einer im Bereich des Auslaufelements angeordneten Heizeinrichtung zur Erwärmung des Auslaufelements entsprechend dem Oberbegriff des Patentanspruchs 1.The invention relates to a melt feeding system for horizontal strip casting of a molten metal with a discharge element, in particular with a pouring nozzle for the free overflow of the molten metal, hereinafter referred to as "nozzle", and with at least one arranged in the region of the outlet element heater for heating the Outlet element according to the preamble of patent claim 1.

Das horizontale Bandgießen von Metallen, das auch als Direct Strip Casting und BCT (Band Casting Technology) bezeichnet wird, wird beispielsweise bei Stahl eingesetzt, beispielsweise mit einem endabmessungsnahen Gießen in Kombination mit einer Offline- oder einer Inline-Walzung. Der Umform- oder Walzschritt hat dabei sowohl den Zweck der Dickenreduzierung als auch der Gefügeneubildung, d. h. der Rekristallisation. Es handelt sich um ein Verfahren mit Ausrichtung auf die Erzeugung von Warmbreitband für Stahllegierungen. Beim Bandgießen wird flüssiger Stahl durch ein Zuführsystem mit einer entsprechend ausgebildeten Düse auf ein umlaufendes, von unten mit Wasser gekühltes Transportband aufgegeben. Die Schmelzenzugabe beim horizontalen Bandgießen erfolgt über das Schmelzenaufgabegefäß oder -aufgabesystem. Dabei durchströmt die Schmelze einen Einfüllbereich sowie anschließend einen Auslaufbereich, bevor sie durch ein keramisches Bauteil, beispielsweise eine Düse mit freiem Überlauf auf das Transportband gelangt. Das Transportband wird durch zwei Umlenkrollen angetrieben und geführt. Die auf das Transportband aufgebrachte Schmelze erstarrt noch im Bereich der Primärkühlung vollständig. Nach der Erstarrung läuft das Band zum Inline-Walzen in Walzgerüste ein. Nach dem Inline-Walzen und einem weiteren Kühlvorgang wird das Band aufgehaspelt. Ein derartiges Gießverfahren zum Bandgießen ist aus der DE 198 52 275 A1 bekannt. Andere Schmelzaufgabensysteme sind aus US 4 619 309 A1 und DE10 2004 015 713 A1 bekannt.The horizontal strip casting of metals, which is also referred to as direct strip casting and BCT (Band Casting Technology), is used for example in steel, for example, with a close to final casting in combination with an offline or an inline rolling. The forming or rolling step has both the purpose of reducing the thickness and the structure formation, ie the recrystallization. It is a process aimed at the production of hot rolled strip for steel alloys. In strip casting, liquid steel is fed by a feed system with a correspondingly formed nozzle onto a circulating transport belt cooled from below with water. The melt addition during horizontal strip casting takes place via the melt feed vessel or feed system. The melt flows through a filling area and then an outlet area before it passes through a ceramic component, such as a nozzle with a free overflow on the conveyor belt. The conveyor belt is driven and guided by two pulleys. The melt applied to the conveyor belt solidifies completely in the area of the primary cooling. After solidification, the strip enters inline rolling in rolling stands. After inline rolling and another cooling process, the belt is rewound. Such a casting method for strip casting is from the DE 198 52 275 A1 known. Other melt dispensing systems are out US 4 619 309 A1 and DE10 2004 015 713 A1 known.

Es ist bekannt, das Schmelzenaufgabesystem vorzuwärmen, um ein Anfrieren des erstarrenden Metalls an dem Auslaufelement (Düse) zu verhindern. Jedoch lässt es sich bei dieser Technologie nicht verhindern, dass das Auslaufelement nach Beendigung des Vorwärmvorgangs nicht mehr genügend heiß ist und es zu Anfrierungen des zu gießenden Metalls kommt. Dies führt zu einem ungleichmäßigen Schmelzenstrom und zu Fehlern im Gussbandprofil und an den Oberflächen der Gussprodukte. Ebenso führen Ablösungen der Anfrierungen während des Gusses ebenfalls zu instationären Zuständen hinsichtlich der Strömung und der Oberflächenqualität. Eine sehr lange Vorheizzeit im Bereich der Metallaufgabe im Schmelzenaufgabesystem, d. h. bis zu dem Zeitpunkt unmittelbar vor dem Eintritt der Schmelze, lässt sich aufgrund einer ebenfalls im Bereich der Metallaufgabe erfolgenden Inertisierung der Schmelze durch ein Inertgas nicht realisieren.It is known to preheat the melt dispensing system to prevent freezing of the solidifying metal at the spout (nozzle). However, this technology can not prevent the outlet element from being hot enough after the end of the preheating process and freezing of the metal to be cast. This leads to an uneven melt flow and to errors in the cast strip profile and on the surfaces of the cast products. Likewise, detachments of the frostbite during casting also lead to transient conditions with regard to the flow and the surface quality. A very long preheating time in the area of metal application in the melt delivery system, d. H. up to the point in time immediately before the melt enters the melt, inertization of the melt by an inert gas can not be achieved due to an inertization of the melt which likewise takes place in the region of the metal feed.

Es ist die Aufgabe der Erfindung, die Nachteile des Standes der Technik zu vermeiden und insbesondere ein Anfrieren des erstarrenden Metalls beim Austritt aus dem Auslaufelement (Düse) zu verhindern.It is the object of the invention to avoid the disadvantages of the prior art and in particular to prevent freezing of the solidifying metal at the outlet from the outlet element (nozzle).

Gemäß der Erfindung wird diese Aufgabe bei einem Schmelzenaufgabesystem der eingangs genannten Art gelöst, wie in Patentanspruch angegeben ist.According to the invention, this object is achieved in a melt delivery system of the type mentioned, as indicated in claim.

Gemäß der Erfindung wird eine aktive Beheizung des Auslaufelements, d. h. der Düse, vorgesehen. Ebenso wird auch der düsennahe Bereich beheizt.According to the invention, an active heating of the outlet element, ie the nozzle, is provided. Likewise, the area close to the nozzle is also heated.

Gemäß der Erfindung ist das Auslaufelement selber mit der Heizeinrichtung ausgestattet, oder die Heizeinrichtung ist benachbart zu dem Auslaufelement angeordnet.According to the invention, the outlet element itself is equipped with the heating device, or the heating device is arranged adjacent to the outlet element.

Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous developments of the invention will become apparent from the dependent claims.

Vorzugsweise ist das Auslaufelement wenigstens teilweise aus einer feuerfesten Keramik ausgebildet.Preferably, the outlet element is at least partially formed of a refractory ceramic.

Die Heizeinrichtung ist beispielsweise als Gasheizung ausgebildet.The heater is designed for example as a gas heater.

Mit Vorteil lässt sich auch vorsehen, dass die Heizung in einem Boden, in Seitenwänden, in einem Wehr, einem Damm, einem Überlauf und/oder in einem Deckel des Auslaufelements bzw. der Düse angeordnet oder integriert ist.Advantageously, it can also be provided that the heater is arranged or integrated in a floor, in side walls, in a weir, a dam, an overflow and / or in a cover of the outlet element or the nozzle.

Vorzugsweise ist die Heizeinrichtung, insbesondere in Form von Heizstäben, in Aussparungen oder Nuten im Boden und/oder im Deckel angeordnet.The heating device, in particular in the form of heating rods, is preferably arranged in recesses or grooves in the bottom and / or in the cover.

In einer weiteren vorteilhaften Ausgestaltung ist die Heizeinrichtung von keramischen Bauteilen umgeben. Diese können in verschiedenen Geometrien zum Einsatz kommen.In a further advantageous embodiment, the heating device is surrounded by ceramic components. These can be used in different geometries.

Mit Vorteil sind die Heizstäbe als Carbid-Heizstäbe, insbesondere als Lithiumcarbid- oder als Siliciumcarbid-Heizstäbe, ausgebildet.Advantageously, the heating elements are designed as carbide heating rods, in particular as lithium carbide or as silicon carbide heating rods.

Die mit wenigstens einem Porenbrenner ausgestaltete Heizeinrichtung lässt sich über weite Bereiche stufenlos und schnell regeln. Der Porenbrenner kann mit einem flüssigen Heizmittel, bevorzugt aber mit einem Gas, betrieben werden. Dabei kommt es bei gleichzeitiger Zuführung eines verbrennbaren Fluids und von Luft zu einer Verbrennungsreaktion in einem Keramikschaum. Der Porenbrenner kann somit ein Düsenunter- und/oder -oberteil flächenmäßig ganz oder partiell ausfüllen. Aufgrund der hohen Flächenleistungsdichte, die sich mit dem Porenbrenner erreichen lässt, kann dieser als kompakte Brennereinheit betrieben werden. Die stufenlos regelbare Brennerleistung erlaubt es, die jeweils im Prozess benötigte Brennerwärme fein dosiert zur Verfügung zu stellen, um die Düsenoberflächen an die im jeweiligen Schmelzprozess erforderlichen Schmelzenparameter anzupassen.The configured with at least one pore burner heater can be infinitely and quickly controlled over wide areas. The pore burner can be operated with a liquid heating medium, but preferably with a gas. It comes with simultaneous delivery of a combustible fluid and air to a combustion reaction in a ceramic foam. The pore burner can thus a Düsenunter- and / or -obererteil fill in whole or in part by area. Due to the high surface power density that can be achieved with the pore burner, this can be operated as a compact burner unit. The infinitely variable burner output makes it possible to provide the required burner heat in a finely dosed manner in order to adapt the nozzle surfaces to the melt parameters required in the respective melting process.

In einer weiteren Ausführungsform kommen mit Vorteil induktive Heizmittel zum Einsatz, z. B. WS "Inducer" Fa. RHI.In a further embodiment, inductive heating means are advantageously used, for. B. WS "Inducer" Fa. RHI.

Besonders vorteilhaft ist ein System mit einer induzierten Mittelfrequenz von etwa 10 kHz. Die Spulengeometrie sollte an das zu erwärmende keramische Bauteil angepasst sein, um eine schnelle und gleichmäßige Erwärmung zu gewährleisten. Die Keramik sollte zudem eine ausreichende elektrische Leitfähigkeit besitzen, um zusammen mit der erforderlichen Leistungsdichte eine kurze Aufwärmzeit von vorzugsweise etwa 10 Minuten zu erbringen.Particularly advantageous is a system with an induced center frequency of about 10 kHz. The coil geometry should be adapted to the ceramic component to be heated in order to ensure rapid and uniform heating. The ceramic should also have sufficient electrical conductivity to provide a short warm-up time, preferably about 10 minutes, together with the required power density.

Das erfindungsgemäße Schmelzenaufgabesystem sieht eine Einheit zur Zuführung eines Inertgases auf den Strang des zu gießenden Metallbandes im Bereich des Auslaufelements vor.The melt delivery system according to the invention provides a unit for supplying an inert gas to the strand of the metal strip to be cast in the region of the outlet element.

Gemäß der Erfindung lassen sich verschiedene Technologien, insbesondere

  1. 1.) Heizelemente, in Keramik integriert, oder als Ersatz der Keramik
  2. 2.) Porenbrenner, wie oben beschrieben, und
  3. 3.) Induktion
zur Erwärmung des Auslaufelements, insbesondere der Düse, integrieren. Wenn die Düse als Keramikelement ausgebildet ist, wird zum Gießen einer Stahlschmelze etwa eine Keramik-Temperatur von 1100°C angestrebt. Wenn der Düsendeckel oder das Düsendach durch ein beheiztes Bauteil ersetzt wird, erhitzt die Wärme über Strahlung die Keramik. Die Heizelemente lassen sich auch in den Deckel der Düse integrieren, insbesondere in den Bereich des Überlaufes.According to the invention, various technologies, in particular
  1. 1.) heating elements, integrated in ceramic, or as a replacement of the ceramic
  2. 2.) pore burners, as described above, and
  3. 3.) induction
for heating the outlet element, in particular the nozzle integrate. When the nozzle is formed as a ceramic element, approximately a ceramic temperature of 1100 ° C is desired for casting a molten steel. When the nozzle cap or nozzle cap is replaced with a heated component, the heat will heat the ceramic via radiation. The heating elements can also be integrated in the cover of the nozzle, in particular in the region of the overflow.

Wenn der Düsenboden durch ein beheiztes Bauteil ersetzt wird, erhitzt die Strahlung ebenfalls die Keramik. Es müssen lediglich geeignete Kühlmaßnahmen für das Transportband getroffen werden, über das das gegossene Metallband abtransportiert wird. Ebenso lassen sich Heizelemente in den Boden der Düse integrieren, insbesondere in den Bereich eines Überlaufes, in einen Damm, ein Wehr oder in die Seitenwände der Düse.If the nozzle bottom is replaced by a heated component, the radiation also heats the ceramic. Only suitable cooling measures must be taken for the conveyor belt, over which the cast metal strip is removed. Likewise, heating elements can be integrated in the bottom of the nozzle, in particular in the region of an overflow, in a dam, a weir or in the side walls of the nozzle.

Insgesamt besteht durch die Erfindung auch der Vorteil, dass der Angießprozess robuster gegenüber Zeit- und auch Temperaturverlusten wird. Das Angießen kann dabei auch über einen längeren Zeitraum erfolgen.Overall, the invention also has the advantage that the casting process becomes more robust against time and temperature losses. The casting can also be done over a longer period.

Nachstehend wird die Erfindung in Ausführungsbeispielen näher erläutert. Es zeigen:

Fig. 1
eine schematische Seitenansicht einer Anlage zum Bandgießen,
Fig. 2
eine Schnittansicht eines mit Heizelementen ausgestatteten Auslaufbereichs in einer Anlage zum Bandgießen und
Fig. 3
eine perspektivische Ansicht, teilweise geschnitten, einer Düse in einer Anlage zum Bandgießen.
The invention will be explained in more detail in exemplary embodiments. Show it:
Fig. 1
a schematic side view of a plant for strip casting,
Fig. 2
a sectional view of a heating elements equipped outlet region in a plant for strip casting and
Fig. 3
a perspective view, partially in section, of a nozzle in a plant for strip casting.

Eine Bandgießanlage 1 (Fig. 1) zum Gießen eines Stahlbands oder eines Bandes aus einem anderen Metall umfasst ein Zuführsystem für das flüssige Metall mit einem Ofen 2, in dem eine Schmelze 3 zunächst enthalten ist.A strip casting plant 1 ( Fig. 1 ) for casting a steel strip or a strip of another metal comprises a liquid metal supply system having a furnace 2 in which a melt 3 is initially contained.

Über eine Stopfenstange 4 lässt sich der Ofen 2 nach unten zu einem Abstichkanal 5 öffnen. Dabei ist die Stopfenstange 4 im geschlossenen Zustand gegenüber einem Dichtring 6 gelagert.Via a stopper rod 4, the furnace 2 can be opened down to a tapping channel 5. In this case, the stopper rod 4 is mounted in the closed state relative to a sealing ring 6.

Aus dem Abstichkanal 5 fließt die Schmelze in ein vorzugsweise ebenfalls beheiztes oder isoliertes Aufgabegefäß 7. Aus diesem wird die Schmelze über einen Austrittskanal 8, der in einem Auslaufbereich, insbesondere in einer Düse 9, endet.From the tapping channel 5, the melt flows into a preferably also heated or insulated task vessel 7. From this, the melt via an outlet channel 8, which ends in an outlet region, in particular in a nozzle 9.

Die Düse 9 ist mit einem Damm 10 und mit einem Wehr 11 ausgestattet, um den Strom der Schmelze zu kanalisieren. Im Bereich des Auslasses der Düse 9 ist eine Gasdüse 12 vorgesehen, die entgegen der Strömungsrichtung der Schmelze einen Strom eines Inertgases erzeugt, um die Schmelze zu verteilen, vorzugsweise auch quer zur Gießrichtung, und/oder um die oberflächliche Korrosion der erstarrenden Schmelze zu verhindern.The nozzle 9 is equipped with a dam 10 and a weir 11 to channel the flow of the melt. In the region of the outlet of the nozzle 9, a gas nozzle 12 is provided, which generates a flow of an inert gas opposite to the flow direction of the melt in order to distribute the melt, preferably also transversely to the casting direction, and / or to prevent superficial corrosion of the solidifying melt.

Diese bildet auf einem endlosen Transportband 13 ein Metallband 14. Das Transportband 13 läuft über eine Umlenk- oder Antriebsrolle 15. Ferner wird das Transportband 13 über Stützrollen 16 und/oder ein Wabengitter geführt. Zwischen diesen sind Sprühdüsen 17 angeordnet, die ein aus einem Becken 18 entnommenes Kühlmedium auf die Unterseite des Transportbandes 13 sprühen, um das Metallband 14 zu erstarren.This forms on an endless conveyor belt 13, a metal strip 14. The conveyor belt 13 passes over a deflection or drive roller 15. Further, the conveyor belt 13 is guided via support rollers 16 and / or a honeycomb grid. Between them, spray nozzles 17 are arranged, which spray a cooling medium taken from a basin 18 onto the underside of the conveyor belt 13 in order to solidify the metal strip 14.

Vorzugsweise sind an den beiden Bandschmalseiten des Transportbandes 13 - hier nicht dargestellte - mit diesem mitlaufende formgebende Segmente vorgesehen, die einander überlappend oder dicht aneinander anschließend angeordnet sind, um ein Auslaufen des sich verfestigenden Metalls zu verhindern. Der Abstand der Segmente ist entweder durch die Breite des Transportbandes 13 vorgegeben oder entsprechend der gewünschten Breite einstellbar.Preferably, not shown here - are provided with this follower forming segments on the two narrow narrow sides of the conveyor belt 13, which are arranged overlapping each other or closely adjacent to each other to prevent leakage of the solidifying metal. The distance of the segments is either predetermined by the width of the conveyor belt 13 or adjustable according to the desired width.

Eine wie die Düse 9 aufgebaute und daher mit demselben Bezugszeichen versehene Düse 9 (Fig. 2) ist an mehreren Stellen mit Heizelementen ausgestattet, um durch die an die Metallschmelze angrenzenden Oberflächen eine konstante Umgebungstemperatur für die Schmelze zur Verfügung zu stellen. Vorzugsweise sind sowohl im Düsenoberteil 19 als auch im Düsenunterteil 20 Heizeinrichtungen vorgesehen. In dem Düsenoberteil 19 sind zwei Heizeinrichtungen 21, 22 in Strömungsrichtung der Schmelze hintereinander angeordnet. Jede der Heizeinrichtungen 21, 22 umfasst einen in einem Keramikrohr 23 gelagerten Heizstab 24. Auch in einem vorderen Wehr 25 der Düse 11 ist ein Heizstab 26 angebracht. Das Wehr ist dabei vorzugsweise innen als Keramikrohr ausgeführt. Der Heizstab 26 kann in dem Keramikrohr integriert sein. Das Wehr 25 steuert ausgangsseitig das Ausströmen der Schmelze aus der Düse 9.A nozzle 9 constructed like the nozzle 9 and therefore provided with the same reference numeral 9 (FIG. Fig. 2 ) is provided with heating elements in several places in order to provide a constant ambient temperature for the melt through the surfaces adjacent to the molten metal. Preferably, 20 heating devices are provided both in the nozzle upper part 19 and in the nozzle lower part. In the nozzle upper part 19, two heaters 21, 22 are arranged one behind the other in the flow direction of the melt. Each of the heating devices 21, 22 comprises a heating rod 24 mounted in a ceramic tube 23. A heating rod 26 is also mounted in a front weir 25 of the nozzle 11. The weir is preferably designed inside as a ceramic tube. The heating element 26 may be integrated in the ceramic tube. On the output side, the weir 25 controls the outflow of the melt from the nozzle 9.

Ebenso ist in dem Düsenunterteil 20 in einem Keramikrohr 27 ein Heizstab 28 untergebracht. Die Heizstäbe 24, 26, 28 sind beispielsweise aus Silicium- oder Lithiumcarbid hergestellt.Likewise, in the nozzle lower part 20 in a ceramic tube 27, a heating element 28 is housed. The heating rods 24, 26, 28 are made of silicon or lithium carbide, for example.

In einer weiteren Ausführungsform einer Düse 30 (Fig. 3) mit einem Unterteil 31 und einem Oberteil 32 sind auf der Oberseite Heizstäbe 33, 34 als ohmsche Widerstandsheizungen ausgebildet und erstrecken sich quer zur Fließrichtung der Schmelze, die die Düse über einen Damm 35 verlässt.In a further embodiment of a nozzle 30 (FIG. Fig. 3 ) with a lower part 31 and an upper part 32 are on the upper side heating rods 33, 34 formed as ohmic resistance heaters and extend transversely to the flow direction of the melt, which leaves the nozzle via a dam 35.

Die Düsenober- und -unterteile 19, 20 und 31, 32 sind beispielsweise vollständig aus einer feuerfesten Keramik aufgebaut. Auch in diesem Fall kann die feuerfeste Keramik mit Ausnehmungen versehen sein, in die von Keramik ummanteltete Heizelemente eingebracht werden, wie die Heizstäbe 33, 34.The nozzle top and bottom parts 19, 20 and 31, 32 are constructed, for example, completely made of a refractory ceramic. Also in this case, the refractory ceramic may be provided with recesses into which ceramic-sheathed heating elements are introduced, such as the heating rods 33, 34.

Andererseits können je nach Schmelztemperatur des zu gießenden Metalls die Düsenober- und -unterteile 19, 20 und 31, 32 auch aus einem Metall mit einer ausreichend höheren Schmelztemperatur bestehen.On the other hand, depending on the melting temperature of the metal to be cast, the nozzle top and bottom parts 19, 20 and 31, 32 may also consist of a metal having a sufficiently higher melting temperature.

Wenn also das zu vergießende Metall Zinn, Zink oder Aluminium oder eine Legierung dieser Metalle ist, können die Düsenober- und -unterteile 19, 20 und 31, 32 auch ganz oder teilweise aus einem Stahl bestehen, beispielsweise einem Edelstahl mit in Hinblick auf den Einsatz angepassten Eigenschaften, insbesondere in Hinblick auf die Korrosivität, wobei auch in diesem Fall Heizstäbe mit Keramikummantelungen in entsprechenden Ausnehmungen in den Düsenober- und -unterteilen eingebracht sein können.Thus, if the metal to be cast is tin, zinc or aluminum or an alloy of these metals, the nozzle tops and bottoms 19, 20 and 31, 32 may also be wholly or partially made of a steel, for example a stainless steel, with respect to use adapted properties, in particular with regard to the corrosivity, wherein also in this case heating rods can be introduced with ceramic sheaths in corresponding recesses in the nozzle top and bottom parts.

Der Pfeil S in den Figuren 2 und 3 bezeichnet die Fließrichtung der Schmelze.The arrow S in the Figures 2 and 3 denotes the flow direction of the melt.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Bandgießanlagestrip casting plant
22
Ofenoven
33
Schmelzemelt
44
Stopfenstangestopper rod
55
Abstichkanaltapping channel
66
Dichtringseal
77
Aufgabegefäßtask vessel
88th
Austrittskanaloutlet channel
99
Düse/AuslaufelementNozzle / outlet element
1010
Dammdam
1111
Wehrweir
1212
Gasdüsegas nozzle
1313
Transportbandconveyor belt
1414
Metallbandmetal band
1515
Umlenk- oder AntriebsrolleDeflection or drive roller
1616
Stützrollensupport rollers
1717
Sprühdüsenspray nozzles
1818
Beckenpool
1919
DüsenoberteilNozzle shell
2020
DüsenunterteilNozzle base
2121
Heizeinrichtungheater
2222
Heizeinrichtungheater
2323
Keramikrohrceramic tube
2424
Heizstabheater
2525
Wehrweir
2626
Heizstabheater
2727
Keramikrohrceramic tube
2828
Heizstabheater
2929
--
3030
Düsejet
3131
Unterteillower part
3232
Oberteiltop
3333
Heizstabheater
3434
Heizstabheater
3535
Dammdam
SS
Pfeil für die Fließrichtung der SchmelzeArrow for the flow direction of the melt

Claims (7)

  1. Melt delivery system for horizontal strip casting of a molten metal (3) with an outlet element, particularly with a nozzle (9, 30) and at least one heating device (21, 22; 28), which is arranged in the region of the outlet element, for heating the outlet element,
    characterised in that
    the heating device comprises at least one porous burner and is arranged in the region, which is near the nozzle, for heating the nozzle and that a gas nozzle (12) is provided in the region of the outlet of the nozzle (9), the gas nozzle generating a flow of an inert gas opposite to the flow direction of the melt so as to distribute the melt.
  2. Melt delivery system according to claim 1, characterised in that the outlet element is constructed at least partly from a refractory ceramic.
  3. Melt delivery system according to claim 1 or 2, characterised in that the heating device (21, 22; 28) is arranged or integrated in a base, in side walls, in a weir, in a dam, in an overflow and/or in a cover of the outlet element or the nozzle.
  4. Melt delivery system according to claim 3, characterised in that the heating device (21, 22), particularly in the form of heating rods (24, 28), is arranged in cut-outs or grooves in the base and/in the cover.
  5. Melt delivery system according to claim 4, characterised in that the heating device (24, 28) is surrounded by ceramic components (23, 27).
  6. Melt delivery system according to claim 4 or 5, characterised in that the heating rods (23, 27) are constructed as carbide heating rods, particularly as lithium-carbide or as silicon-carbide heating rods.
  7. Melt delivery system according to any one of claims 1 to 6, characterised in that the heating device comprises inductive heating means.
EP11740894.8A 2010-07-31 2011-07-29 Melt charging system for strip casting Active EP2598268B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010033018A DE102010033018A1 (en) 2010-07-31 2010-07-31 Melt feeding system for strip casting
PCT/EP2011/063098 WO2012016922A1 (en) 2010-07-31 2011-07-29 Melt charging system for strip casting

Publications (2)

Publication Number Publication Date
EP2598268A1 EP2598268A1 (en) 2013-06-05
EP2598268B1 true EP2598268B1 (en) 2019-09-11

Family

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EP11740894.8A Active EP2598268B1 (en) 2010-07-31 2011-07-29 Melt charging system for strip casting

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US (1) US20130269905A1 (en)
EP (1) EP2598268B1 (en)
KR (1) KR20130041927A (en)
CN (1) CN103025456B (en)
BR (1) BR112013002475A2 (en)
DE (1) DE102010033018A1 (en)
RU (1) RU2628590C2 (en)
WO (1) WO2012016922A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102016116711A1 (en) 2016-09-07 2018-03-08 Salzgitter Flachstahl Gmbh Method for producing a metal strip on a horizontal strip casting plant
DE102017221969A1 (en) 2017-12-05 2019-06-06 Sms Group Gmbh Method and device for producing a band-shaped composite material

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3587718A (en) * 1968-05-22 1971-06-28 Robert K Hopkins Continuous casting apparatus

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Publication number Priority date Publication date Assignee Title
GB1396701A (en) * 1971-07-16 1975-06-04 Singer A R E Strip casting
CH633205A5 (en) * 1978-01-30 1982-11-30 Alusuisse DEVICE FOR FEEDING A METAL MELT IN BAND CASTING.
DE4039959C1 (en) * 1990-12-14 1992-01-23 Wieland-Werke Ag, 7900 Ulm, De
DE4218587C1 (en) * 1991-09-27 1993-11-04 Wieland Werke Ag METHOD AND DEVICE FOR PRODUCING A METAL STRIP NEAR DIMENSIONS
US5439047A (en) * 1994-02-07 1995-08-08 Eckert; C. Edward Heated nozzle for continuous caster
DE19852275C2 (en) 1998-11-13 2002-10-10 Sms Demag Ag Belt casting plant and method
DE102004015713B4 (en) * 2004-03-29 2006-03-30 Thyssenkrupp Steel Ag Casting jet for magnesium or magnesium alloy strip metal has rectangular cross-section passage with heated sidewalls
WO2007131721A1 (en) * 2006-05-16 2007-11-22 Sms Demag Ag Heating device for preheating a liquid-metal transfer container
EP1946866A1 (en) * 2007-01-20 2008-07-23 MKM Mansfelder Kupfer und Messing GmbH Method and device for casting non-ferrous metal melts, in particular copper or copper alloys
DE102009031236B3 (en) * 2009-06-26 2010-12-02 Salzgitter Flachstahl Gmbh Producing steel strip by strip casting, comprises placing metal melt from feed vessel to rotating casting strip of horizontal strip casting system by casting groove and siphon-like outlet area formed as casting nozzle under protective gas

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3587718A (en) * 1968-05-22 1971-06-28 Robert K Hopkins Continuous casting apparatus

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US20130269905A1 (en) 2013-10-17
DE102010033018A1 (en) 2012-02-02
KR20130041927A (en) 2013-04-25
RU2013108515A (en) 2014-09-10
CN103025456B (en) 2016-04-20
WO2012016922A1 (en) 2012-02-09
EP2598268A1 (en) 2013-06-05
CN103025456A (en) 2013-04-03
RU2628590C2 (en) 2017-08-21
BR112013002475A2 (en) 2016-05-24

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