EP0379042A2 - Arrangement to stir a liquid core for a strand at the mold-exit in a continuous casting installation - Google Patents

Arrangement to stir a liquid core for a strand at the mold-exit in a continuous casting installation Download PDF

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Publication number
EP0379042A2
EP0379042A2 EP90100398A EP90100398A EP0379042A2 EP 0379042 A2 EP0379042 A2 EP 0379042A2 EP 90100398 A EP90100398 A EP 90100398A EP 90100398 A EP90100398 A EP 90100398A EP 0379042 A2 EP0379042 A2 EP 0379042A2
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EP
European Patent Office
Prior art keywords
stirring device
mold
strand
stirrer
stirring
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Granted
Application number
EP90100398A
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German (de)
French (fr)
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EP0379042B1 (en
EP0379042A3 (en
Inventor
Markus Schmid
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Concast Standard AG
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Concast Standard AG
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Priority to AT90100398T priority Critical patent/ATE82170T1/en
Publication of EP0379042A2 publication Critical patent/EP0379042A2/en
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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
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields

Definitions

  • the invention relates to a stirring device in a continuous casting installation for stirring a liquid strand sump according to the preamble of claim 1.
  • the stirring devices are often built into the mold.
  • the electromagnetic field must penetrate the mold wall, which usually consists of copper.
  • the magnetic field also has to penetrate a cooling water gap, boundary walls for the cooling water gap and for the stirrer housing, which causes high electrical outputs and correspondingly high operating costs.
  • a continuous casting mold which is designed as a composite body and consists of an upper and lower mold part.
  • the upper mold part has copper walls and the lower mold part has mold cavity walls made of antimagnetic material and is equipped with stirring coils.
  • This mold which is composed of two different metals in the mold cavity, can cause problems at the interface due to different expansion coefficients. At the interface, gap joints and bends can occur, which lead to difficulties starting up, string errors and breakthroughs.
  • the invention has for its object to provide a stirring device for stirring the liquid sump of a cast strand in the mold exit area, which eliminates the aforementioned disadvantages.
  • a high stirring effect should be achieved with a relatively low energy requirement and at the same time a quick and easy mold change with or without a stirrer change should be realized.
  • investment costs for mold stirrers are to be reduced and only a few new parts are required when installing stirrers in existing systems.
  • the stirring device according to the invention and the arrangement according to the invention on the mold table allow stirrers to be operated with low electrical outputs which achieve a high stirring effect.
  • the stirring device which oscillates with the mold table and which immediately follows the mold outlet brings sufficient stirring power or a rotational movement into the liquid sump inside the mold, so that there is no need for a stirrer in the mold itself. Chill mold changes can be carried out more quickly and easily without disassembling the stirrer, and old, stirrer-free molds can still be used when stirring devices are installed in existing systems. Only a few new parts are required for the stirrer assembly itself.
  • a particularly advantageous variant is to provide the mold table with support, centering and clamping devices for the stirring device.
  • the mold can be used independently of the support, centering and clamping devices for the stirrer Chill table with its own such facilities.
  • the existing, stirrer-free molds can be centered and tightened via an intermediate piece on the mold table.
  • the outer dimensions of the intermediate piece are generally larger than the outer dimensions of a support flange of the stirring device.
  • An optimal geometric shape of the stirrer with regard to wear, cooling and efficiency can be achieved if an air gap is provided between the stirrer and the cast strand and spray compartments of spray nozzles penetrate into this air gap.
  • the air gap can diverge in the direction of the run.
  • a high stirring effect in the strand with a relatively low electrical power can additionally be achieved if, according to one embodiment, the housing wall is made of stainless steel between the coils of the stirring device and the strand.
  • an exchangeable protective shield made of stainless steel between the stirrer and the strand surface.
  • This protective shield can overlap the mold tube or abut a mold tube on the end face and can be arranged to be exchangeable at the bottom.
  • Water cooling can also be provided between the stirring device and the protective shield.
  • stirrer is designed with coils for a mains frequency, preferably for 50 or 60 Hz.
  • the stirrer coils can be arranged in such a way that the stirring device generates a rotating field transverse to the strand withdrawal direction and applies a rotational movement to the liquid core of the strand, which runs essentially concentrically to the strand longitudinal axis.
  • the stirring device is mounted separately from the mold on the mold table, the stirrer is directly at the exit during casting arranged the mold tube.
  • the gap between the stirrer and the mold cannot be measured or can hardly be measured in many cases. It is preferably a few tenths of a mm to 5 mm and in exceptional cases can be up to 20 mm. Larger gaps, however, reduce the stirring effect within the mold and favor the entry of liquid steel between the mold and stirrer in the event of a strand break.
  • stirrer with a cooling system that is independent of the mold cooling.
  • the stirrer cooling system can advantageously be connected to the spray water cooling. Additional spray water cooling can be set up between the stirring device and the protective shield.
  • FIG. 1 an upper part of a vertical or sheet continuous casting system, preferably for billet, bloom or blank formats, etc., is shown.
  • a steel jet 3 feeds liquid steel to a mold 2, and a partially solidified strand 4 is drawn out at the lower end of the mold.
  • the mold 2 is supported via an intermediate piece 5 on a guide part 6 of the mold table 8.
  • a stirring device is designated, which immediately follows the mold cavity 11 of the oscillating mold.
  • the stirring device 10 is separated from the mold 2 and is held in position independently of this in the guide part 6 of the mold table 8 by means of centering devices 12.
  • the agitator is direction 10 carried by the mold table 8 or clamped directly to it.
  • the mold 2 has its own centering devices 15 and clamping devices 16. In this example, it is attached to the oscillating table 8 via an intermediate piece 5. However, it could also be centered and clamped directly on the oscillation table via a correspondingly large mold flange.
  • the outer dimensions 19 of the intermediate piece 5 are larger than the dimension 20 of the outer boundary of an aerofoil 7 of the stirring device 10.
  • An air gap 22 is provided between the stirrer 10 and the cast strand 4, which diverges strongly in the direction of the strand. Spray compartments 24 of spray nozzles 25 penetrate into this gap, which increases downwards.
  • An envelope 27 between the coils in the stirring device 10 and the strand 4 is made of stainless steel.
  • the stirrer 10 has stirring coils which are designed for a three-phase mains frequency, for example 50 or 60 Hz etc.
  • the stirring coils generally generate a rotating field transverse to the strand withdrawal direction 28, which sets the liquid core 29 of the strand 4 in rotation.
  • an exchangeable protective shield 30 or 30 ' is provided in these examples.
  • the protective shield 30 overlaps at its upper ends a copper pipe part 32 of the mold 2.
  • an open cooling device 31, 31' is provided by means of spray water.
  • the protective shield 30 'abuts the end face of a copper pipe part 32' of the mold 2.
  • the protective shields 30, 30 ' are fastened so that they can be replaced from below even in the installed state.
  • stirrer 10 and the mold 2 are installed independently of one another on the mold table, between the lower boundary surface 34 of the mold 2 and an upper boundary surface 35 of the stirring device 10 the smallest possible gap between a fraction of a mm and 5 mm is provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Accessories For Mixers (AREA)

Abstract

In an arrangement to stir a liquid core for a strand at the mould exit in a continuous casting installation, a stirring arrangement is provided adjoining the moulding cavity of an oscillating mould. In order to achieve a high stirring effect for a relatively low energy requirement and, at the same time, to be able to carry out a rapid and simple mould change with or without a change of stirrer and to lower investment costs for mould stirrers, the stirring arrangement directly adjoining the cool moulding cavity of the mould and oscillating together with the latter can be mounted on the mould table separately from the mould. <IMAGE>

Description

Die Erfindung betrifft eine Rühreinrichtung in einer Stranggiessanlage zum Rühren eines flüssigen Strangsumpfes gemäss Oberbegriff von Anspruch 1.The invention relates to a stirring device in a continuous casting installation for stirring a liquid strand sump according to the preamble of claim 1.

Es ist bekannt, den flüssigen Strangsumpf beim Stranggiessen in der Kokil­le selbst oder entlang einer Sekundärkühlzone mittels elektromagnetischen Kräften zu rühren.It is known to stir the liquid strand sump during the continuous casting in the mold itself or along a secondary cooling zone by means of electromagnetic forces.

Bei Knüppel- und Vorblockformaten werden die Rühreinrichtungen vielfach in die Kokille eingebaut. Das elektromagnetische Feld muss dabei die Ko­killenwand, die in der Regel aus Kupfer besteht, durchdringen. Im weite­ren muss das magnetische Feld auch noch einen Kühlwasserspalt, Begren­zungswände für den Kühlwasserspalt und für das Rührergehäuse durchdringen, was hohe elektrische Leistungen und entsprechend hohe Betriebskosten ver­ursacht.In the case of billet and billet formats, the stirring devices are often built into the mold. The electromagnetic field must penetrate the mold wall, which usually consists of copper. Furthermore, the magnetic field also has to penetrate a cooling water gap, boundary walls for the cooling water gap and for the stirrer housing, which causes high electrical outputs and correspondingly high operating costs.

Aus DE-PS 29 11 187 ist eine Stranggiesskokille bekannt, die als Verbund­körper ausgebildet ist und aus einem oberen und unteren Kokillenteil be­steht. Der obere Kokillenteil hat Kupferwände und der untere Kokillenteil hat Formhohlraumwände aus antimagnetischem Werkstoff und ist mit Rührspu­len versehen. Bei dieser im Formhohlraum aus zwei unterschiedlichen Me­tallen zusammengesetzten Kokille können Probleme an der Nahtstelle wegen unterschiedlichen Ausdehnungskoeffizienten entstehen. An der Nahtstelle können Spaltfugen und Verbiegungen auftreten, die Anfahrschwierigkeiten, Strangfehler und Durchbrüche erzeugen.From DE-PS 29 11 187 a continuous casting mold is known, which is designed as a composite body and consists of an upper and lower mold part. The upper mold part has copper walls and the lower mold part has mold cavity walls made of antimagnetic material and is equipped with stirring coils. This mold, which is composed of two different metals in the mold cavity, can cause problems at the interface due to different expansion coefficients. At the interface, gap joints and bends can occur, which lead to difficulties starting up, string errors and breakthroughs.

Aus DE-PS 27 31 238, die den Oberbegriff von Anspruch 1 bildet, ist wei­ter eine Kokille bekannt, die mit einer anschliessend an den Formhohlraum der Kokille versehenen Rühreinrichtung ausgerüstet ist. Je nach den Er­fordernissen kann die Länge der Rühreinrichtung, die mit dem Kokillenbo­den verschraubt ist, in ihrer Länge verändert werden. Die Vielzahl der Rührer in der Kokille und unterhalb der Kokille erfordert eine hohe elek­trische Leistung. Bei jedem Kokillenwechsel werden die Rührer zwangsläu­fig mit der Kokille ausgebaut. Bei Einbauten von Rührern in vorhandene Anlagen sind neue Kokillen und in der Regel auch neue Kokillentische er­forderlich.From DE-PS 27 31 238, which forms the preamble of claim 1, a mold is also known, which with a subsequent to the mold cavity the mold-equipped stirrer is equipped. Depending on the requirements, the length of the stirring device which is screwed to the mold bottom can be changed in length. The large number of stirrers in the mold and below the mold requires high electrical power. With each mold change, the stirrers are inevitably removed with the mold. When installing stirrers in existing systems, new molds and generally also new mold tables are required.

Der Erfindung liegt die Aufgabe zugrunde, eine Rühreinrichtung zum Rühren des flüssigen Sumpfes eines gegossenen Stranges im Bereich des Kokillen­ausganges zu schaffen, die die vorgenannten Nachteile ausschaltet. Insbe­sondere soll eine hohe Rührwirkung bei relativ niedrigem Energiebedarf erreicht und gleichzeitig ein rascher und einfacher Kokillenwechsel mit oder ohne Rührerwechsel verwirklicht werden können. Im weiteren sollen In­vestitionskosten für Kokillenrührer gesenkt und bei Einbauten von Rührern in vorhandene Anlagen nur wenig Neubauteile benötigt werden.The invention has for its object to provide a stirring device for stirring the liquid sump of a cast strand in the mold exit area, which eliminates the aforementioned disadvantages. In particular, a high stirring effect should be achieved with a relatively low energy requirement and at the same time a quick and easy mold change with or without a stirrer change should be realized. In addition, investment costs for mold stirrers are to be reduced and only a few new parts are required when installing stirrers in existing systems.

Diese Aufgabe wird durch die Summe der Merkmale von Anspruch 1 gelöst.This object is achieved by the sum of the features of claim 1.

Die erfindungsgemässe Rühreinrichtung und die erfindungsgemässe Anordnung am Kokillentisch erlauben, Rührer mit niedrigen elektrischen Leistungen zu betreiben, die eine hohe Rührwirkung erzielen. Die mit dem Kokillen­tisch oszillierende Rühreinrichtung, die unmittelbar dem Kokillenausgang folgt, bringt eine ausreichende Rührkraft bzw. eine Rotationsbewegung in den flüssigen Sumpf innerhalb der Kokille, so dass auf Rührer in der Ko­kille selbst verzichtet werden kann. Kokillenwechsel können ohne Demonta­ge des Rührers rascher und einfacher vorgenommen werden, und bei Einbau­ten von Rühreinrichtungen in vorhandene Anlagen können alte, rührerlose Kokillen weiter verwendet werden. Auch für die Rührermontage selbst sind nur wenige Neubauteile erforderlich.The stirring device according to the invention and the arrangement according to the invention on the mold table allow stirrers to be operated with low electrical outputs which achieve a high stirring effect. The stirring device which oscillates with the mold table and which immediately follows the mold outlet brings sufficient stirring power or a rotational movement into the liquid sump inside the mold, so that there is no need for a stirrer in the mold itself. Chill mold changes can be carried out more quickly and easily without disassembling the stirrer, and old, stirrer-free molds can still be used when stirring devices are installed in existing systems. Only a few new parts are required for the stirrer assembly itself.

Es sind verschiedene Möglichkeiten denkbar, die Rühreinrichtungen am Ko­killentisch anzubringen. Eine besonders vorteilhafte Variante besteht darin, den Kokillentisch mit Auflage-, Zentrier- und Spanneinrichtungen für die Rühreinrichtung zu versehen. Die Kokille kann unabhängig von den Auflage-, Zentrier- und Spanneinrichtungen für den Rührer gegenüber dem Kokillentisch mit eigenen solchen Einrichtungen versehen sein.Various options are conceivable for attaching the stirring devices to the mold table. A particularly advantageous variant is to provide the mold table with support, centering and clamping devices for the stirring device. The mold can be used independently of the support, centering and clamping devices for the stirrer Chill table with its own such facilities.

Beim Einbau von Rührern in vorhandene Anlagen ist es von besonderem Vor­teil, wenn die vorhandenen, rührerlosen Kokillen über ein Zwischenstück am Kokillentisch zentrier- und festspannbar sind. Die Aussenabmessungen des Zwischenstückes sind dabei in der Regel grösser, als die Aussenab­messungen eines Tragflansches der Rühreinrichtung.When installing stirrers in existing systems, it is particularly advantageous if the existing, stirrer-free molds can be centered and tightened via an intermediate piece on the mold table. The outer dimensions of the intermediate piece are generally larger than the outer dimensions of a support flange of the stirring device.

Eine optimale geometrische Formgebung des Rührers in bezug auf Ver­schleiss, Kühlung und Wirkungsgrad kann erreicht werden, wenn zwischen dem Rührer und dem gegossenen Strang ein Luftspalt vorgesehen ist und Sprühfächer von Sprühdüsen in diesen Luftspalt eindringen. Gemäss einer vorteilhaften Ausführungsform kann der Luftspalt in Stranglaufrichtung divergieren.An optimal geometric shape of the stirrer with regard to wear, cooling and efficiency can be achieved if an air gap is provided between the stirrer and the cast strand and spray compartments of spray nozzles penetrate into this air gap. According to an advantageous embodiment, the air gap can diverge in the direction of the run.

Eine hohe Rührwirkung im Strang bei relativ niedriger elektrischer Lei­stung kann zusätzlich erreicht werden, wenn, gemäss einem Ausführungsbei­spiel, zwischen den Spulen der Rühreinrichtung und dem Strang die Gehäu­sewand aus rostfreiem Stahl ausgeführt ist.A high stirring effect in the strand with a relatively low electrical power can additionally be achieved if, according to one embodiment, the housing wall is made of stainless steel between the coils of the stirring device and the strand.

Zum Schutz der Rühreinrichtung gegen Wärmestrahlung, ausfliessenden Stahl bei Durchbrüchen etc. wird im Sinne eines Ausführungsbeispieles vorge­schlagen, zwischen Rührer und Strangoberfläche ein auswechselbares Schutz­schild aus rostfreiem Stahl anzuordnen. Dieses Schutzschild kann das Ko­killenrohr überlappen oder stirnseitig an ein Kokillenrohr anstossen und nach unten auswechselbar angeordnet sein. Zwischen der Rühreinrichtung und dem Schutzschild kann im weiteren eine Wasserkühlung vorgesehen sein.In order to protect the stirring device against heat radiation, leaking steel in the event of breakthroughs, it is proposed in the sense of an exemplary embodiment to arrange an exchangeable protective shield made of stainless steel between the stirrer and the strand surface. This protective shield can overlap the mold tube or abut a mold tube on the end face and can be arranged to be exchangeable at the bottom. Water cooling can also be provided between the stirring device and the protective shield.

Eine weitere wesentliche Reduktion von Investitionskosten ist erzielbar, wenn der Rührer mit Spulen für eine Netzfrequenz, vorzugsweise für 50 oder 60 Hz, ausgelegt ist. Die Rührerspulen können dabei so angeordnet sein, dass die Rühreinrichtung ein Drehfeld quer zur Strangabzugsrichtung er­zeugt und dem flüssigen Kern des Stranges eine Rotationsbewegung auf­bringt, die im wesentlichen konzentrisch zur Stranglängsachse verläuft.A further substantial reduction in investment costs can be achieved if the stirrer is designed with coils for a mains frequency, preferably for 50 or 60 Hz. The stirrer coils can be arranged in such a way that the stirring device generates a rotating field transverse to the strand withdrawal direction and applies a rotational movement to the liquid core of the strand, which runs essentially concentrically to the strand longitudinal axis.

Obwohl die Rühreinrichtung getrennt von der Kokille am Kokillentisch mon­tiert wird, ist der Rührer während des Giessens unmittelbar am Ausgang des Kokillenrohres angeordnet. Gemäss einem Ausführungsbeispiel ist der Spalt zwischen Rührer und Kokille in vielen Fällen nicht oder kaum mess­bar. Er beträgt vorzugsweise wenige zehntel-mm bis 5 mm und kann in Aus­nahmefällen bis 20 mm betragen. Grössere Spalte reduzieren aber die Rühr­wirkung innerhalb der Kokille und begünstigen den Eintritt von flüssigem Stahl zwischen Kokille und Rührer im Falle eines Strangdurchbruches.Although the stirring device is mounted separately from the mold on the mold table, the stirrer is directly at the exit during casting arranged the mold tube. According to one embodiment, the gap between the stirrer and the mold cannot be measured or can hardly be measured in many cases. It is preferably a few tenths of a mm to 5 mm and in exceptional cases can be up to 20 mm. Larger gaps, however, reduce the stirring effect within the mold and favor the entry of liquid steel between the mold and stirrer in the event of a strand break.

Gemäss einem Ausführungsbeispiel wird vorgeschlagen, den Rührer mit einem von der Kokillenkühlung unabhängigen Kühlsystem zu versehen. Das Rührer­kühlsystem kann mit Vorteil mit der Sprühwasserkühlung verbunden werden. Eine zusätzliche Sprühwasserkühlung kann zwischen der Rühreinrichtung und dem Schutzschild eingerichtet werden.According to one embodiment, it is proposed to provide the stirrer with a cooling system that is independent of the mold cooling. The stirrer cooling system can advantageously be connected to the spray water cooling. Additional spray water cooling can be set up between the stirring device and the protective shield.

Im nachfolgenden soll die Erfindung anhand von Figuren zusätzlich erläu­tert werden.In the following, the invention will be further explained with the aid of figures.

Es zeigen:

  • Fig. 1 eine Seitenansicht, teilweise im Schnitt, einer Stranggiesskokil­le und einer Rühreinrichtung auf einem oszillierenden Kokillen­tisch,
  • Fig. 2 einen vergrösserten Vertikalschnitt durch einen Kokillen- und Rührerteil eines weiteren Beispieles und
  • Fig. 3 einen vergrösserten Vertikalschnitt durch einen Kokillen- und Rüh­rerteil eines weiteren Beispieles.
Show it:
  • 1 is a side view, partly in section, of a continuous casting mold and a stirring device on an oscillating mold table,
  • Fig. 2 is an enlarged vertical section through a mold and stirrer part of another example and
  • Fig. 3 is an enlarged vertical section through a mold and stirrer part of another example.

In Fig. 1 ist ein oberer Teil einer Vertikal- oder Bogenstranggiessanlage, vorzugsweise für Knüppel-, Vorblock- oder Platinenformate etc.,darge­stellt. Ein Stahlstrahl 3 führt einer Kokille 2 flüssigen Stahl zu, und am unteren Ende der Kokille wird ein teilweise erstarrter Strang 4 aus­gezogen. Die Kokille 2 ist über ein Zwischenstück 5 auf einem Führungs­teil 6 des Kokillentisches 8 abgestützt.In Fig. 1, an upper part of a vertical or sheet continuous casting system, preferably for billet, bloom or blank formats, etc., is shown. A steel jet 3 feeds liquid steel to a mold 2, and a partially solidified strand 4 is drawn out at the lower end of the mold. The mold 2 is supported via an intermediate piece 5 on a guide part 6 of the mold table 8.

Mit 10 ist eine Rühreinrichtung bezeichnet, die dem Formhohlraum 11 der oszillierenden Kokille unmittelbar folgt. Die Rühreinrichtung 10 ist von der Kokille 2 getrennt und wird unabhängig von dieser im Führungsteil 6 des Kokillentisches 8 mittels Zentriereinrichtungen 12 in Position gehal­ten. Mittels Auflage- und Spanneinrichtungen 13 bzw. 14 wird die Rührein­ richtung 10 vom Kokillentisch 8 getragen bzw. an diesem direkt festge­klemmt.With 10 a stirring device is designated, which immediately follows the mold cavity 11 of the oscillating mold. The stirring device 10 is separated from the mold 2 and is held in position independently of this in the guide part 6 of the mold table 8 by means of centering devices 12. By means of support and clamping devices 13 and 14, the agitator is direction 10 carried by the mold table 8 or clamped directly to it.

Die Kokille 2 besitzt eigene Zentriereinrichtungen 15 und Spanneinrich­tungen 16. Sie ist in diesem Beispiel über ein Zwischenstück 5 am Os­zillationstisch 8 befestigt. Sie könnte aber auch über einen entsprechend grossen Kokillenflansch direkt am Oszillationstisch zentriert und festge­klemmt werden. Die Aussenabmessungen 19 des Zwischenstückes 5 sind grös­ser als die Abmessung 20 der äusseren Begrenzung einer Tragfläche 7 der Rühreinrichtung 10.The mold 2 has its own centering devices 15 and clamping devices 16. In this example, it is attached to the oscillating table 8 via an intermediate piece 5. However, it could also be centered and clamped directly on the oscillation table via a correspondingly large mold flange. The outer dimensions 19 of the intermediate piece 5 are larger than the dimension 20 of the outer boundary of an aerofoil 7 of the stirring device 10.

Zwischen dem Rührer 10 und dem gegossenen Strang 4 ist ein Luftspalt 22 vorgesehen, der in Stranglaufrichtung stark divergiert. In diesem sich nach unten vergrössernden Spalt dringen von unten Sprühfächer 24 von Sprühdüsen 25 ein. Eine Umhüllung 27 zwischen den Spulen in der Rührein­richtung 10 und dem Strang 4 ist aus rostfreiem Stahl gefertigt.An air gap 22 is provided between the stirrer 10 and the cast strand 4, which diverges strongly in the direction of the strand. Spray compartments 24 of spray nozzles 25 penetrate into this gap, which increases downwards. An envelope 27 between the coils in the stirring device 10 and the strand 4 is made of stainless steel.

Der Rührer 10 besitzt Rührspulen, die für eine Drehstromnetzfrequenz, bei­spielsweise 50 oder 60 Hz etc., ausgelegt sind. Die Rührspulen erzeugen in der Regel ein Drehfeld quer zur Strangabzugsrichtung 28, das den flüs­sigen Kern 29 des Stranges 4 in Rotation versetzt.The stirrer 10 has stirring coils which are designed for a three-phase mains frequency, for example 50 or 60 Hz etc. The stirring coils generally generate a rotating field transverse to the strand withdrawal direction 28, which sets the liquid core 29 of the strand 4 in rotation.

In Fig. 2 und 3 werden für gleiche Teile gleiche Bezugsziffern wie für Fig. 1 verwendet. Zwischen dem Gehäuse des Rührers 10 und dem gegossenen Strang 4 ist in diesen Beispielen ein auswechselbares Schutzschild 30 bzw. 30′ vorgesehen. Das Schutzschild 30 überlappt an seinen oberen Enden einen Kupferrohrteil 32 der Kokille 2. Zwischen dem Schutzschild 30, 30′ und dem Gehäuse des Rührers 10 ist eine offene Kühleinrichtung 31, 31′ mittels Sprühwasser vorgesehen.2 and 3, the same reference numerals are used as for Fig. 1 for the same parts. Between the housing of the stirrer 10 and the cast strand 4, an exchangeable protective shield 30 or 30 'is provided in these examples. The protective shield 30 overlaps at its upper ends a copper pipe part 32 of the mold 2. Between the protective shield 30, 30 'and the housing of the stirrer 10, an open cooling device 31, 31' is provided by means of spray water.

In Fig. 3 stösst das Schutzschild 30′ stirnseitig an einen Kupferrohrteil 32′ der Kokille 2. Die Schutzschilder 30, 30′ sind so befestigt, dass sie auch in eingebautem Zustand von unten auswechselbar sind.In Fig. 3, the protective shield 30 'abuts the end face of a copper pipe part 32' of the mold 2. The protective shields 30, 30 'are fastened so that they can be replaced from below even in the installed state.

Obwohl der Rührer 10 und die Kokille 2 voneinander unabhängig am Kokillen­tisch eingebaut werden, ist zwischen der unteren Begrenzungsfläche 34 der Kokille 2 und einer oberen Begrenzungsfläche 35 der Rühreinrichtung 10 ein möglichst kleiner Spalt zwischen eime Bruchteil eines mm und 5 mm vor­gesehen.Although the stirrer 10 and the mold 2 are installed independently of one another on the mold table, between the lower boundary surface 34 of the mold 2 and an upper boundary surface 35 of the stirring device 10 the smallest possible gap between a fraction of a mm and 5 mm is provided.

Claims (17)

1. Rühreinrichtung in Stranggiessanlage zum Rühren eines flüssigen Strangsumpfes im Kokillenausgangsbereich, wobei eine Rühreinrichtung (10) anschliessend an den Formhohlraum (11) einer oszillierenden Ko­kille (2) vorgesehen ist, dadurch gekennzeichnet, dass die unmittel­bar an den gekühlten Formhohlraum (11) der Kokille (2) anschliessen­de, zusammen mit der Kokille (2) oszillierende Rühreinrichtung (10) von der Kokille (2) getrennt am Kokillentisch (8) anbringbar ist.1. Stirring device in a continuous casting installation for stirring a liquid strand sump in the mold exit area, a stirring device (10) being provided next to the mold cavity (11) of an oscillating mold (2), characterized in that the mold mold is directly connected to the cooled mold cavity (11) (2) subsequent, together with the mold (2) oscillating stirring device (10) from the mold (2) can be attached to the mold table (8). 2. Rühreinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Rühr­einrichtung (10) gegenüber dem Kokillentisch (8) Zentriereinrichtungen (12) aufweist.2. Stirring device according to claim 1, characterized in that the stirring device (10) with respect to the mold table (8) has centering devices (12). 3. Rühreinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Rühreinrichtung (10) gegenüber dem Kokillentisch (8) Auflage- und/­oder Spanneinrichtungen (7 bzw. 14) aufweist.3. Stirring device according to claim 1 or 2, characterized in that the stirring device (10) with respect to the mold table (8) has support and / or tensioning devices (7 or 14). 4. Rühreinrichtung nach einem der Ansprüche 1 - 3, dadurch gekennzeichnet, dass die Kokille (2) gegenüber dem Kokillentisch (8) Zentrier- und Spanneinrichtungen (15 bzw. 16) aufweist.4. Stirring device according to one of claims 1-3, characterized in that the mold (2) with respect to the mold table (8) has centering and clamping devices (15 or 16). 5. Rühreinrichtung nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, dass die Kokille (2) über ein Zwischenstück (5) am Kokillentisch (8) zentrier- und festspannbar ist.5. Stirring device according to one of claims 1-4, characterized in that the mold (2) via an intermediate piece (5) on the mold table (8) can be centered and clamped. 6. Rühreinrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Aus­senabmessungen (19) des Zwischenstückes (5) grösser als die Aussenab­messungen (20) eines Tragflansches der Rühreinrichtung (10) sind.6. Stirring device according to claim 5, characterized in that the outer dimensions (19) of the intermediate piece (5) are larger than the outer dimensions (20) of a support flange of the stirring device (10). 7. Rühreinrichtung nach einem der Ansprüche 1 - 6, dadurch gekennzeichnet, dass zwischen dem Rührer (10) und dem gegossenen Strang (4) ein Luft­spalt (22) vorgesehen ist und Sprühfächer (24) von Sprühdüsen (25) in diesen Luftspalt (22) eindringen.7. Stirring device according to one of claims 1-6, characterized in that an air gap (22) is provided between the stirrer (10) and the cast strand (4) and spray compartments (24) of spray nozzles (25) in this air gap (22 ) penetrate. 8. Rühreinrichtung nach Anspruch 7, dadurch gekennzeichnet, dass der Luft­spalt (22) in Stranglaufrichtung (28) divergiert.8. Stirring device according to claim 7, characterized in that the air gap (22) in the strand running direction (28) diverges. 9. Rühreinrichtung nach einem der Ansprüche 1 - 8, dadurch gekennzeichnet, dass zwischen den Spulen der Rühreinrichtung (10) und dem Strang (4) eine Umhüllung (27) aus rostfreiem Stahl vorgesehen ist.9. stirring device according to one of claims 1-8, characterized in that between the coils of the stirring device (10) and the strand (4) is provided a casing (27) made of stainless steel. 10. Rühreinrichtung nach einem der Ansprüche 1 - 9, dadurch gekennzeichnet, dass der Rührer (10) mit Rührspulen für eine Netzfrequenz, vorzugsweise 50 - 60 Hz, ausgelegt ist.10. Stirring device according to one of claims 1-9, characterized in that the stirrer (10) is designed with stirring coils for a mains frequency, preferably 50-60 Hz. 11. Rühreinrichtung nach einem der Ansprüche 1 - 10, dadurch gekennzeichnet, dass die Rühreinrichtung (10) ein Drehfeld quer zur Strangabzugsrich­tung (28) erzeugt und dem flüssigen Kern (29) des Stranges (4) eine Ro­tationsbewegung aufbringt, die im wesentlichen konzentrisch zur Strangachse verläuft.11. Stirring device according to one of claims 1-10, characterized in that the stirring device (10) generates a rotating field transverse to the strand withdrawal direction (28) and the liquid core (29) of the strand (4) applies a rotational movement which is essentially concentric with Strand axis runs. 12. Rühreinrichtung nach einem der Ansprüche 1 - 11, dadurch gekennzeich­net, dass der Rührer (10) ein von der Kokillenkühlung unabhängiges Kühlsystem (31, 31′) aufweist.12. Stirring device according to one of claims 1-11, characterized in that the stirrer (10) has a cooling system (31, 31 ') which is independent of the mold cooling. 13. Rühreinrichtung nach Anspruch 12, dadurch gekennzeichnet, dass das Rührerkühlsystem mit der Sprühwasserkühlung (31) verbunden ist.13. Stirring device according to claim 12, characterized in that the stirrer cooling system is connected to the spray water cooling (31). 14. Rühreinrichtung nach einem der Ansprüche 1 - 13, dadurch gekennzeichnet, dass zwischen einer unteren Begrenzungsfläche (34) der Kokille (2) und einer oberen Begrenzungsfläche (35) der Rühreinrichtung (10) ein Spalt von 0 - 5 mm vorgesehen ist.14. Stirring device according to one of claims 1-13, characterized in that a gap of 0-5 mm is provided between a lower boundary surface (34) of the mold (2) and an upper boundary surface (35) of the stirring device (10). 15. Rühreinrichtung nach einem der Ansprüche 1 - 14, dadurch gekennzeichnet, dass ein ein Kokillenrohr (32) überlappendes, nach unten auswechselba­res Schutzschild (30) angeordnet ist.15. Stirring device according to one of claims 1-14, characterized in that a mold tube (32) overlapping, downward replaceable protective shield (30) is arranged. 16. Rühreinrichtung nach Anspruch 15, dadurch gekennzeichnet, dass das Schutzschild (30′) stirnseitig an ein Kokillenrohr (32′) anstösst und nach unten auswechselbar befestigt ist.16. Stirring device according to claim 15, characterized in that the protective shield (30 ') abuts on the end face of a mold tube (32') and is exchangeably fastened downwards. 17. Rühreinrichtung nach einem der Ansprüche 15 oder 16, dadurch gekenn­zeichnet, dass zwischen der Rühreinrichtung (10) und dem Schutzschild (30, 30′) eine Wasserkühlung (31, 31′) vorgesehen ist.17. Stirring device according to one of claims 15 or 16, characterized in that a water cooling (31, 31 ') is provided between the stirring device (10) and the protective shield (30, 30').
EP90100398A 1989-01-19 1990-01-10 Arrangement to stir a liquid core for a strand at the mold-exit in a continuous casting installation Expired - Lifetime EP0379042B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90100398T ATE82170T1 (en) 1989-01-19 1990-01-10 STIRRING DEVICE IN CONTINUOUS CASTING PLANT FOR STIRRING A LIQUID STRAND SUMP IN THE MOLD OUTLET AREA.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH164/89 1989-01-19
CH164/89A CH678026A5 (en) 1989-01-19 1989-01-19

Publications (3)

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EP0379042A2 true EP0379042A2 (en) 1990-07-25
EP0379042A3 EP0379042A3 (en) 1990-12-19
EP0379042B1 EP0379042B1 (en) 1992-11-11

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EP90100398A Expired - Lifetime EP0379042B1 (en) 1989-01-19 1990-01-10 Arrangement to stir a liquid core for a strand at the mold-exit in a continuous casting installation

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US (1) US5025853A (en)
EP (1) EP0379042B1 (en)
JP (1) JP2955315B2 (en)
AT (1) ATE82170T1 (en)
CH (1) CH678026A5 (en)
DE (1) DE59000436D1 (en)
ES (1) ES2036844T3 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499117A2 (en) * 1991-02-09 1992-08-19 KM Europa Metal Aktiengesellschaft Continuous casting of copper alloys
WO1996001162A1 (en) * 1994-07-01 1996-01-18 Voest-Alpine Industrieanlagenbau Gmbh Continuous-casting mould with a stirrer incorporating a magnetic circuit

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100376504B1 (en) * 1998-08-04 2004-12-14 주식회사 포스코 Continuous casting method and continuous casting apparatus used
US20090110892A1 (en) * 2004-06-30 2009-04-30 General Electric Company System and method for making a graded barrier coating
US20110048669A1 (en) * 2009-08-31 2011-03-03 Abb Inc. Electromagnetic stirrer arrangement with continuous casting of steel billets and bloom
WO2019113165A1 (en) * 2017-12-06 2019-06-13 The Suppes Family Trust Molded self-assembled electromagnet motors and devices
KR102121979B1 (en) 2018-10-24 2020-06-12 주식회사 퓨쳐캐스트 A die casting device comprising a movable electromagnetic control coil module
WO2020085775A1 (en) * 2018-10-24 2020-04-30 주식회사 퓨쳐캐스트 Die casting apparatus provided with movable electromagnetically controlled structure control module

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2016977A (en) * 1978-03-23 1979-10-03 Voest Ag Cooled continuous casting mould with electromagnetic stirring
JPS59101261A (en) * 1982-12-02 1984-06-11 Kawasaki Steel Corp Continuous casting method with which flow of molten steel is braked by static magnetic field
EP0165316A1 (en) * 1982-06-08 1985-12-27 Kawasaki Steel Corporation Electromagnetic stirring apparatus for continuous casting machine
JPS61186157A (en) * 1985-02-14 1986-08-19 Mitsubishi Heavy Ind Ltd Supporting method of electromagnetic stirrer

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3167829A (en) * 1962-02-20 1965-02-02 Concast Ag Apparatus for continuous casting of metal
US3804147A (en) * 1971-03-30 1974-04-16 Etudes De Centrifugation Continuous rotary method of casting metal utilizing a magnetic field
US3967362A (en) * 1975-07-14 1976-07-06 United States Steel Corporation Continuous caster alignment method
FR2358222A1 (en) * 1976-07-13 1978-02-10 Siderurgie Fse Inst Rech NEW PROCESS AND DEVICE FOR THE ELECTROMAGNETIC BREWING OF CONTINUOUS FLOWING METAL PRODUCTS
GR65264B (en) * 1978-02-18 1980-07-31 British Aluminium Co Ltd Metal casting
JPS5794458A (en) * 1980-12-03 1982-06-11 Mitsubishi Heavy Ind Ltd Electromagnetic stirrer in continuous casting machine
US4473105A (en) * 1981-06-10 1984-09-25 Olin Corporation Process for cooling and solidifying continuous or semi-continuously cast material
JPS60136845U (en) * 1984-02-16 1985-09-11 株式会社神戸製鋼所 Mold for electromagnetic stirring of continuous casting machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2016977A (en) * 1978-03-23 1979-10-03 Voest Ag Cooled continuous casting mould with electromagnetic stirring
EP0165316A1 (en) * 1982-06-08 1985-12-27 Kawasaki Steel Corporation Electromagnetic stirring apparatus for continuous casting machine
JPS59101261A (en) * 1982-12-02 1984-06-11 Kawasaki Steel Corp Continuous casting method with which flow of molten steel is braked by static magnetic field
JPS61186157A (en) * 1985-02-14 1986-08-19 Mitsubishi Heavy Ind Ltd Supporting method of electromagnetic stirrer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 10 (M-552)[2457], 10. Januar 1987; & JP-A-61 186 157 (MITSUBISHI HEAVY IND.) 19-08-1986 *
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 216 (M-329)[1653], 3. Oktober 1984; & JP-A-59 101 261 (KAWASAKI SEITETSU K.K.) 11-06-1984 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0499117A2 (en) * 1991-02-09 1992-08-19 KM Europa Metal Aktiengesellschaft Continuous casting of copper alloys
EP0499117A3 (en) * 1991-02-09 1992-09-30 Kabelmetal Ag Continuous casting of copper alloys
WO1996001162A1 (en) * 1994-07-01 1996-01-18 Voest-Alpine Industrieanlagenbau Gmbh Continuous-casting mould with a stirrer incorporating a magnetic circuit

Also Published As

Publication number Publication date
DE59000436D1 (en) 1992-12-17
CH678026A5 (en) 1991-07-31
US5025853A (en) 1991-06-25
ES2036844T3 (en) 1993-06-01
ATE82170T1 (en) 1992-11-15
EP0379042B1 (en) 1992-11-11
EP0379042A3 (en) 1990-12-19
JPH02229652A (en) 1990-09-12
JP2955315B2 (en) 1999-10-04

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