EP2598268A1 - Melt charging system for strip casting - Google Patents

Melt charging system for strip casting

Info

Publication number
EP2598268A1
EP2598268A1 EP11740894.8A EP11740894A EP2598268A1 EP 2598268 A1 EP2598268 A1 EP 2598268A1 EP 11740894 A EP11740894 A EP 11740894A EP 2598268 A1 EP2598268 A1 EP 2598268A1
Authority
EP
European Patent Office
Prior art keywords
melt
heating
nozzle
heating device
outlet element
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
Application number
EP11740894.8A
Other languages
German (de)
French (fr)
Other versions
EP2598268B1 (en
Inventor
Jörg BAUSCH
Reiner PÜRLING
Jochen SCHLÜTER
Jochen Wans
Karl-Heinz Spitzer
Hellfried Eichholz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Group GmbH
Original Assignee
SMS Siemag AG
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Filing date
Publication date
Application filed by SMS Siemag AG filed Critical SMS Siemag AG
Publication of EP2598268A1 publication Critical patent/EP2598268A1/en
Application granted granted Critical
Publication of EP2598268B1 publication Critical patent/EP2598268B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • 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
    • B22D11/0631—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
    • B22D11/06—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".
  • 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, d. H. the recrystallization. It is a process aimed at the production of hot wide 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 known from DE 198 52 275 A1.
  • this object is achieved in a melt delivery system of the type mentioned above in that at least one heating device for heating the outlet element is arranged in the region of the outlet element.
  • an active heating of the outlet element i. H. in particular the nozzle, provided.
  • the area close to the jet can also be heated.
  • the outlet element is at least partially formed from a refractory ceramic.
  • the heating device is designed as a gas heater and / or as an electric 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 silicon carbide heating rods.
  • the heater comprises at least one pore burner
  • 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 fill a nozzle bottom and / or upper part completely or partially in terms of area. Due to the high surface power density that can be achieved with the pore burner, this can be considered as be operated 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 melt delivery system advantageously also provides a unit for supplying an inert gas to the strand of the metal strip to be cast in the area of the outlet element.
  • heating elements can be integrated in ceramic or as a replacement of the ceramic
  • the outlet element for heating the outlet element, in particular the nozzle integrate.
  • the nozzle is formed as a ceramic element, a ceramic temperature of 1 100 ° C is targeted for casting a molten steel.
  • 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. 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.
  • 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 advantage of the invention is that the casting process becomes more robust against time and temperature losses.
  • the casting can also be done over a longer period.
  • Fig. 1 is a schematic side view of a plant for strip casting
  • Fig. 2 is a sectional view of a equipped with heating elements outlet area in a plant for strip casting and
  • Fig. 3 is a perspective view, partially in section, of a nozzle in a plant for strip casting.
  • 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.
  • 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 with a weir 1 1 to channel the flow of the melt.
  • a gas nozzle 12 is provided, which generates against the flow direction of the melt, a stream of inert gas to distribute the melt, preferably also transversely to the casting direction, and / or to the superficial corrosion of the solidifying melt prevent.
  • 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 band 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 (FIG. 2) constructed like the nozzle 9 and therefore provided with the same reference numeral is provided with heating elements at several points in order to provide a constant flow through the surfaces adjacent to the molten metal To provide ambient temperature for the melt.
  • 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 heaters 21, 22 comprises a heating rod 24 mounted in a ceramic tube 23.
  • a heating rod 26 is mounted in a front weir 25 of the nozzle 1 1, .
  • 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.
  • heating rods 33, 34 are designed as ohmic resistance heaters on the upper side and extend transversely to the flow direction of the melt, which leaves the nozzle via a dam 35.
  • the upper and lower nozzle parts 19, 20 and 31, 32 are, for example, constructed completely from a refractory ceramic.
  • the refractory ceramic can be provided with recesses into which ceramic elements surrounded by ceramic 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 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.
  • the arrow S in FIGS. 2 and 3 denotes the flow direction of the melt.

Landscapes

  • 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)

Abstract

A melt charging system for the horizontal strip casting of a molten metal with a run-out element, in particular with a nozzle (9), is characterized in that at least one heating device (21, 22; 28) is arranged in the region of the run-out element for heating up the run-out element.

Description

Schmelzenaufgabesystem zum Bandgießen  Melt feeding system for strip casting
Die Erfindung bezieht sich auf ein Schmelzenaufgabesystem zum horizontalen Bandgießen eines schmelzflüssigen Metalls mit einem Auslaufelement, insbe- sondere mit einer Gießdüse für den freien Überlauf des schmelzflüssigen Metalls, im weiteren mit„Düse" bezeichnet. 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".
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 Warm breitband für Stahllegierungen. 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, d. H. the recrystallization. It is a process aimed at the production of hot wide strip for steel alloys.
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 voll- ständig. 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. 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 un- gleichmäßigen 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. 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. In this case, 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 known from DE 198 52 275 A1. 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 the metal feed in the melt delivery system, ie up to the time immediately before the melt enters, can not be realized by an inert gas due to an inerting of the melt also taking place in the area of the metal feed.
Es ist die Aufgabe der Erfindung, die Nachteile des Standes der Technik zu ver- meiden 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 when it leaves the outlet element (nozzle).
Gemäß der Erfindung wird diese Aufgabe bei einem Schmelzenaufgabesystem der eingangs genannten Art dadurch gelöst, dass im Bereich des Auslaufele- ments wenigstens eine Heizeinrichtung zur Erwärmung des Auslaufelements angeordnet ist. According to the invention, this object is achieved in a melt delivery system of the type mentioned above in that at least one heating device for heating the outlet element is arranged in the region of the outlet element.
Gemäß der Erfindung wird eine aktive Beheizung des Auslaufelements, d. h. insbesondere der Düse, vorgesehen. Ebenso lässt sich auch der düsennahe Bereich beheizen. According to the invention, an active heating of the outlet element, i. H. in particular the nozzle, provided. Likewise, the area close to the jet can also be heated.
Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen. Besonders geeignet ist eine Ausführung der Erfindung, gemäß der das Auslaufelement selber mit der Heizeinrichtung ausgestattet ist oder die Heizeinrichtung benachbart zu dem Auslaufelement angeordnet ist. Advantageous developments of the invention will become apparent from the dependent claims. Particularly suitable is an embodiment of the invention, according to which the outlet element itself is equipped with the heating device or the heating device is arranged adjacent to the outlet element.
Vorzugsweise ist das Auslaufelement wenigstens teilweise aus einer feuerfes- ten Keramik ausgebildet. Preferably, the outlet element is at least partially formed from a refractory ceramic.
In vorteilhafter Weise ist die Heizeinrichtung als Gasheizung und/oder als elektrische Heizung ausgebildet. 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, the heating device is designed as a gas heater and / or as an electric heater. 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 Lithium- carbid- oder als Siliciumcarbid-Heizstäbe, ausgebildet. Advantageously, the heating elements are designed as carbide heating rods, in particular as lithium carbide or silicon carbide heating rods.
Wenn die Heizeinrichtung wenigstens einen Porenbrenner umfasst, lässt sich eine über weite Bereiche stufenlos und schnell regelbare Heizung vorsehen. 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. In einer weiteren Ausführungsform kommen mit Vorteil induktive Heizmittel zum Einsatz, z. B. WS„Inducer" Fa. RHI. If the heater comprises at least one pore burner, can be provided over a wide range stepless and quickly controllable heating. 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 fill a nozzle bottom and / or upper part completely or partially in terms of area. Due to the high surface power density that can be achieved with the pore burner, this can be considered as be operated 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 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. Das erfindungsgemäße Schmelzenaufgabesystem sieht mit Vorteil auch eine Einheit zur Zuführung eines Inertgases auf den Strang des zu gießenden Metallbandes im Bereich des Auslaufelements vor. 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. The melt delivery system according to the invention advantageously also provides a unit for supplying an inert gas to the strand of the metal strip to be cast in the area of the outlet element.
Gemäß der Erfindung lassen sich verschiedene Technologien, insbesondere 1 .) Heizelemente in Keramik integriert oder als Ersatz der Keramik According to the invention, various technologies, in particular 1) heating elements can be integrated in ceramic or as a replacement of the ceramic
2. ) Porenbrennen, wie oben beschrieben, und  2.) pore burning, as described above, and
3. ) Induktion  3.) induction
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 1 100°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. 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. for heating the outlet element, in particular the nozzle integrate. When the nozzle is formed as a ceramic element, a ceramic temperature of 1 100 ° C is targeted 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. 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 Angießpro- zess robuster gegenüber Zeit- und auch Temperaturverlusten wird. Das Angießen kann dabei auch über einen längeren Zeitraum erfolgen. Overall, the advantage of the invention is 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: The invention will be explained in more detail in exemplary embodiments. Show it:
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. 1 is a schematic side view of a plant for strip casting, Fig. 2 is a sectional view of a equipped with heating elements outlet area in a plant for strip casting and
Fig. 3 eine perspektivische Ansicht, teilweise geschnitten, einer Düse in einer Anlage zum Bandgießen.  Fig. 3 is 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 caster 1 (Figure 1) for casting a steel strip or 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. 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. 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. 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 1 1 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 Kor- rosion der erstarrenden Schmelze zu verhindern. The nozzle 9 is equipped with a dam 10 and with a weir 1 1 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 against the flow direction of the melt, a stream of inert gas to distribute the melt, preferably also transversely to the casting direction, and / or to the superficial corrosion of the solidifying melt prevent.
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 band 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 1 1 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 (FIG. 2) constructed like the nozzle 9 and therefore provided with the same reference numeral is provided with heating elements at several points in order to provide a constant flow through the surfaces adjacent to the molten metal To provide ambient temperature for the melt. 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 heaters 21, 22 comprises a heating rod 24 mounted in a ceramic tube 23. Also in a front weir 25 of the nozzle 1 1, a heating rod 26 is mounted. 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. 3) with a lower part 31 and an upper part 32, heating rods 33, 34 are designed as ohmic resistance heaters on the upper side 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 vollstän- dig aus einer feuerfesten Keramik aufgebaut. Auch in diesem Fall kann die feuerfeste Keramik mit Ausnehmungen versehen sein, in die von Keramik umman- teltete Heizelemente eingebracht werden, wie die Heizstäbe 33, 34. The upper and lower nozzle parts 19, 20 and 31, 32 are, for example, constructed completely from a refractory ceramic. In this case too, the refractory ceramic can be provided with recesses into which ceramic elements surrounded by ceramic 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. 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. 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. 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 FIGS. 2 and 3 denotes the flow direction of the melt.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
1 Bandgießanlage 1 strip casting plant
10 2 Ofen  10 2 oven
3 Schmelze  3 melt
4 Stopfenstange  4 stopper rod
5 Abstichkanal  5 tapping channel
6 Dichtring  6 sealing ring
15 7 Aufgabegefäß  15 7 task vessel
8 Austrittskanal  8 outlet channel
9 Düse/Auslaufelement 9 nozzle / outlet element
10 Damm 10 dam
1 1 Wehr  1 1 weir
20 12 Gasdüse  20 12 gas nozzle
13 Transportband  13 conveyor belt
14 Metallband  14 metal band
15 Umlenk- oder Antriebsrolle 15 deflection or drive roller
16 Stützrollen 16 support rollers
25 17 Sprühdüsen  25 17 spray nozzles
18 Becken  18 pools
19 Düsenoberteil  19 nozzle top
20 Düsenunterteil  20 nozzle base
21 Heizeinrichtung  21 heating device
30 22 Heizeinrichtung  30 22 heating device
23 Keramikrohr  23 ceramic tube
24 Heizstab  24 heating rod
25 Wehr  25 weirs
26 Heizstab  26 heating rod
35 27 Keramikrohr  35 27 Ceramic tube
28 Heizstab 5 29 -28 heating rod 5 29 -
30 Düse 30 nozzle
31 Unterteil  31 lower part
32 Oberteil  32 upper part
33 Heizstab  33 heating rod
10 34 Heizstab  10 34 heating element
35 Damm  35 dam
S Pfeil für die Fließrichtung der Schmelze  S Arrow for the flow direction of the melt
15 15
20 20
25 25

Claims

Patentansprüche claims
1 . Schmelzenaufgabesystem zum horizontalen Bandgießen eines schmelzflüssigen Metalls (3) mit einem Auslaufelement, insbesondere mit einer Düse (9, 30), 1 . Melt-feeding system for horizontal strip casting of a molten metal (3) with a discharge element, in particular with a nozzle (9, 30),
dadurch gekennzeichnet,  characterized,
dass im Bereich des Auslaufelements wenigstens eine Heizeinrichtung (21 , 22; 28) zur Erwärmung des Auslaufelements angeordnet ist.  in that at least one heating device (21, 22, 28) for heating the outlet element is arranged in the region of the outlet element.
2. Schmelzenaufgabesystem nach Anspruch 1 , 2. Melt dispensing system according to claim 1,
dadurch gekennzeichnet,  characterized,
dass das Auslaufelement selber mit der Heizeinrichtung (21 , 22; 28) ausgestattet ist oder dass die Heizeinrichtung benachbart zu dem Auslaufelement angeordnet ist.  the outlet element itself is equipped with the heating device (21, 22; 28) or that the heating device is arranged adjacent to the outlet element.
3. Schmelzenaufgabesystem nach Anspruch 1 oder 2, 3. melt delivery system according to claim 1 or 2,
dadurch gekennzeichnet,  characterized,
dass das Auslaufelement wenigstens teilweise aus einer feuerfesten Keramik ausgebildet ist.  the outlet element is formed at least partially from a refractory ceramic.
4. Schmelzenaufgabesystem nach einem der Ansprüche 1 bis 3, 4. Melt dispensing system according to one of claims 1 to 3,
dadurch gekennzeichnet,  characterized,
dass die Heizeinrichtung als Gasheizung und/oder als elektrische Heizung ausgebildet ist.  that the heating device is designed as a gas heater and / or as an electric heater.
5. Schmelzenaufgabesystem nach einem der Ansprüche 1 bis 4, 5. Melt dispensing system according to one of claims 1 to 4,
dadurch gekennzeichnet,  characterized,
dass die Heizeinrichtung (21 , 22; 28) in einem Boden, in Seitenwänden, in einem Wehr, einem Damm, einem Überlauf und/oder in einem De- ekel des Auslaufelements bzw. der Düse angeordnet oder integriert ist. Schmelzenaufgabesystem nach Anspruch 5, in that the heating device (21, 22; 28) is arranged or integrated in a base, in sidewalls, in a weir, a dam, an overflow and / or in a dekel of the outlet element or the nozzle. Melt-feeding system according to claim 5,
dadurch gekennzeichnet,  characterized,
dass die Heizeinrichtung (21 , 22), insbesondere in Form von Heizstäben (24, 28), in Aussparungen oder Nuten im Boden und/oder im Deckel angeordnet sind.  in that the heating device (21, 22), in particular in the form of heating rods (24, 28), are arranged in recesses or grooves in the bottom and / or in the cover.
Schmelzenaufgabesystem nach Anspruch 6, Melt-feeding system according to claim 6,
dadurch gekennzeichnet,  characterized,
dass die Heizeinrichtung (24, 28) von keramischen Bauteilen (23, 27) umgeben ist.  the heating device (24, 28) is surrounded by ceramic components (23, 27).
Schmelzenaufgabesystem nach Anspruch 6 oder 7, Melt-feeding system according to claim 6 or 7,
dadurch gekennzeichnet,  characterized,
dass die Heizstäbe (23, 27) als Carbid-Heizstäbe, insbesondere als Li- thiumcarbid- oder als Siliciumcarbid-Heizstäbe, ausgebildet sind.  the heating rods (23, 27) are designed as carbide heating rods, in particular as lithium carbide or as silicon carbide heating rods.
Schmelzenaufgabesystem nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, Melt-feeding system according to one of Claims 1 to 6, characterized
dass die Heizeinrichtung wenigstens einen Porenbrenner umfasst. 10. Schmelzenaufgabesystem nach einem der Ansprüche 1 bis 9,  in that the heating device comprises at least one pore burner. 10. Melt dispensing system according to one of claims 1 to 9,
dadurch gekennzeichnet,  characterized,
dass die Heizeinrichtung induktive Heizmittel umfasst.  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 true EP2598268A1 (en) 2013-06-05
EP2598268B1 EP2598268B1 (en) 2019-09-11

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

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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

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Publication number Priority date Publication date Assignee Title
US3587718A (en) * 1968-05-22 1971-06-28 Robert K Hopkins Continuous casting apparatus
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

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Title
See references of WO2012016922A1 *

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EP2598268B1 (en) 2019-09-11
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
CN103025456A (en) 2013-04-03
RU2628590C2 (en) 2017-08-21
BR112013002475A2 (en) 2016-05-24

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