EP1792676A1 - Mould for continuous casting of metal - Google Patents

Mould for continuous casting of metal Download PDF

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Publication number
EP1792676A1
EP1792676A1 EP06023082A EP06023082A EP1792676A1 EP 1792676 A1 EP1792676 A1 EP 1792676A1 EP 06023082 A EP06023082 A EP 06023082A EP 06023082 A EP06023082 A EP 06023082A EP 1792676 A1 EP1792676 A1 EP 1792676A1
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EP
European Patent Office
Prior art keywords
cooling grooves
cooling
grooves
mold according
width
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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
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EP06023082A
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German (de)
French (fr)
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EP1792676B1 (en
Inventor
Hans-Günter Dr. Wobker
Gerhard HUGENSCHÜTT
Raimund Boldt
Dietmar Kolbeck
Frank Maiwald
Hans-Dirk Piwowar
Daniel Reinelt
Dirk Dr. Rode
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KME Special Products GmbH and Co KG
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KM Europa Metal AG
KME Germany GmbH
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Publication of EP1792676A1 publication Critical patent/EP1792676A1/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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/041—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds for vertical casting
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • B22D11/055—Cooling the moulds
    • 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
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • B22D11/124—Accessories for subsequent treating or working cast stock in situ for cooling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper

Definitions

  • the invention relates to a mold for the continuous casting of metal with the features of the preamble of claim 1.
  • Mold tubes usually have a uniform wall thickness in a horizontal cross-sectional plane, which increases in the strand direction due to the internal conicity of the mold tube.
  • the internal conicity is adapted to the solidification behavior of the strand and the continuous casting parameters. Shortly after the incipient solidification of the continuous casting material, ie immediately below the casting level, a very different cooling behavior of the casting strand occurs due to the three-dimensional heat flow over the cross-section. Because in the corners of the mold tube due to the geometric conditions particularly large amounts of heat are dissipated, there is a particularly strong strand shell growth and thus a particularly strong shrinkage.
  • the DE 195 81 547 C2 to provide the inner surface with recesses or depressions, which are arranged at a distance of 15 mm to 200 mm below a recorded in a stable operating condition G cordador. This should also enable a stable casting at high speed. All these approaches do not adequately reflect the real heat flow distribution.
  • the invention is based on the prior art based on the object to provide a mold with which the homogeneity of the strand cooling is further increased to realize higher casting performance and better strand quality as a result and which also helps to reduce stresses within the Kokillenwandung ,
  • Essential in the mold according to the invention is that the cooling effect of the mold is optimized so that it corresponds to the heat supply of the strand, thereby to come to a uniform cooling. This is achieved in that the depth and / or width of the cooling grooves in the middle of a side wall of the mold is largest and decreases in the direction of the corner regions of the side wall. It is crucial that the cross-sectional area of the cooling grooves in the middle region of a side wall is greater than in the edge region of a side wall. It has been shown that by introducing the cooling grooves in the manner according to the invention, the maximum comparison stresses occurring in the side wall can be significantly reduced. Ideal elastic strength calculations have confirmed that the comparative stress can be reduced by more than 30% from 504 MPa to 348 MPa.
  • This information refers to a mold cross section of 130x130 mm, wherein a mold tube without grooves has been compared to a mold tube with the grooves designed according to the invention.
  • the achieved in this way reducing the stresses in the mold tube has an advantageous effect on the life and reduces the thermally induced distortion of the mold tube.
  • the mold tube according to the invention has in this calculation on each side wall eight grooves at a distance of 5 mm with a length extending in the casting direction of 200 mm.
  • the middle grooves have a depth of 5 mm, whereas the outer grooves have a depth of 4 mm with a width of 12 mm and 8 mm, respectively.
  • the cooling geometry corresponds to the heat flow impressed from the inside as well as possible and thus a largely homogeneous temperature field can be achieved, which has so far only unsuccessfully succeeded. It is important that the cooling grooves are made deeper and / or wider in the middle of the side wall where the heat supply is highest, so have a larger cross-sectional area, as in the corner radius near areas.
  • no cooling grooves are provided in the side wall at a distance of 10 mm to 15 mm from the radius corner region in order not to increase the cooling here and not to unnecessarily weaken the rigidity of the mold.
  • the best results can be achieved if the cooling grooves have a depth of 3 mm - 6 mm. It should not fall below a residual wall thickness of 6 mm between thedenutentiefsten and Kokillenrohrinnenseite.
  • the width of the cooling grooves is preferably between 5 mm - 20 mm to choose.
  • the cooling grooves are preferably provided in the groove bottom with a small transition radius to the groove walls in order to avoid voltage peaks there.
  • the cooling grooves ideally have a radius in the inlet and outlet areas, which contributes to the flow optimization of the cooling water and to the reduction of pressure losses.
  • the aim is for the width of the cooling grooves to increase toward the middle of the side wall and, in addition, for the depth to increase toward the middle.
  • the different Riehnutengeometrie can be prepared either by machining the mold or by cutting machining during forming of the mold.
  • the cooling grooves are arranged in a region which begins about 50 mm above the target level and extends to about 300 mm below the target level, since in this region the greatest heat flux densities occur and thus also the stresses in the sidewall of the mold are maximum.
  • deeper areas, ie areas at a distance greater than 300 mm below the G confuseLitesolllage must indeed also be cooled, but due to the already formed strand shell, the temperature inhomogeneity is not so large that the inventively designed grooves mandatory in these lower areas required are.
  • Outstanding results are already achieved when the inventively designed grooves start about 50 mm above the G confuseLitesolllage and extend to 300 mm below the G confusesolllage.
  • FIGS 1a and 1b show once in perspective and once in an enlargement of the perspective view of a mold tube 1, which is positioned in a manner not shown in a water tank.
  • the special feature of this mold tube 1 are specially configured cooling grooves 2, which are formed on the outer surface 3 of the mold tube 1.
  • the cooling grooves 2 do not extend over the entire length of the mold tube 1, but are located exclusively in the upper, inflow-side region of the mold tube 1.
  • the cooling grooves 2 have a length of 200 mm.
  • the cooling grooves 2 are located in the region of the G beauLitesolllage, which in the upper quarter of the illustrated cooling grooves. 2 lies.
  • cooling grooves 2 of this Kokillenrohrs are not all the same width and depth, but differ both in width and in depth.
  • the outer, the corner regions 4 facing cooling grooves 2a and 2b are narrower than the lying in the central region of the respective side wall cooling grooves 2c.
  • the middle cooling grooves 2c have a width of 12 mm
  • the four outer cooling grooves 2a and 2b may have a width of 8 mm. All cooling grooves 2a, 2b, 2c have the same length. However, not only does the width of the cooling grooves 2a, 2b, 2c vary, but also their depth.
  • the cooling grooves 2a, 2b, 2c have a radius 5 in the inlet and outlet region, ie at each end.
  • the transition of the radius 5 to the lowest of the individual cooling grooves 2a, 2b, 2c can be seen by a horizontal line.
  • the depth is recognizable to be greatest.
  • the depth of the outside adjacent cooling grooves 2b is slightly smaller.
  • the depth is the smallest at the outside, the corner regions 4 facing cooling grooves 2c.
  • the corner regions 4 are not provided with cooling grooves.
  • the mold tube is fastened with a water guide plate not shown in the water tank, so that the cooling water is pressed into the individual cooling channels 2a, 2b, 2c.
  • the water deflectors are arranged so that the mold tube is held centrally in the water gap.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

The die has cooling grooves (2, 2c) over at least part of the outside surface and the depth and/or width of the grooves is greatest in the centre of a side wall of the die and decreases towards the corner areas of the side wall. There are preferably no cooling grooves in the area of 10 to 15 mm from the radius of the corner areas. The width/depth ratio for the cooling grooves is between 1 and 4.

Description

Die Erfindung betrifft eine Kokille zum Stranggießen von Metall mit den Merkmalen des Oberbegriffs des Patentanspruchs 1.The invention relates to a mold for the continuous casting of metal with the features of the preamble of claim 1.

Rohrförmige Kokillen aus Kupfer oder Kupferlegierungen zum Gießen von Profilen aus Stahl oder anderen Metallen mit hohem Schmelzpunkt sind vielfach im Stand der Technik beschrieben worden. Kokillenrohre besitzen üblicherweise in einer horizontalen Querschnittsebene eine gleichmäßige Wanddicke, die in Strangrichtung aufgrund der Innenkonizität des Kokillenrohrs zunimmt. Die Innenkonizität ist an das Erstarrungsverhalten des Stranges und die Stranggussparameter angepasst. Kurz nach der einsetzenden Erstarrung des Stranggussmaterials, also unmittelbar unterhalb des Gießspiegels, kommt es aufgrund des über den Querschnitt dreidimensional ausgeprägten Wärmeabflusses zu einem stark unterschiedlich ausgeprägten Abkühlungsverhalten des Gießstrangs. Weil in den Ecken des Kokillenrohrs aufgrund der geometrischen Verhältnisse besonders große Wärmemengen abgeführt werden, zeigt sich dort ein besonders starkes Strangschalenwachstum und damit eine besonders starke Schrumpfung. An den Seitenwänden der Kokillenrohre ist die Wärmeabfuhr in der Regel geringer, obschon hier gleichzeitig ein höherer Wärmestrom aufgeprägt wird. Die Folge der lokal unterschiedlichen Abkühlung ist ein ungleichmäßiges Strangschalenwachstum, was zu Materialspannungen und Rissen in der Strangschale führen kann und damit das Risiko eines Strangdurchbruches erhöht.Tubular molds of copper or copper alloys for casting profiles of steel or other high melting point metals have been widely described in the art. Mold tubes usually have a uniform wall thickness in a horizontal cross-sectional plane, which increases in the strand direction due to the internal conicity of the mold tube. The internal conicity is adapted to the solidification behavior of the strand and the continuous casting parameters. Shortly after the incipient solidification of the continuous casting material, ie immediately below the casting level, a very different cooling behavior of the casting strand occurs due to the three-dimensional heat flow over the cross-section. Because in the corners of the mold tube due to the geometric conditions particularly large amounts of heat are dissipated, there is a particularly strong strand shell growth and thus a particularly strong shrinkage. On the side walls of the Kokillenrohre the heat dissipation is usually lower, although here at the same time a higher heat flow is impressed. The consequence of the locally different cooling is an uneven strand shell growth, which can lead to material tensions and cracks in the strand shell and thus increases the risk of a strand breakthrough.

Es wurden bereits eine Reihe von Vorschlägen gemacht, um eine möglichst homogene Wärmeabfuhr zu erreichen und damit auch die Voraussetzung für eine höhere Gießleistung zu schaffen. Beispielsweise ist aus der DE 36 21 073 A1 eine Kokille bekannt, bei welcher nur die bogenförmigen Seitenflächen, nicht hingegen die Eckbereiche mit Kühlnuten versehen werden. Die Kühlung sollte vor allem im Bereich des Gießspiegels erhöht werden, wie es auch in der DE 34 11 359 A1 beschrieben wird. Mit der Verbesserung der Kühlleistung und der Erhöhung der Gießgeschwindigkeit befasst sich auch die EP 1 468 760 B1 , die vorschlägt, dass die Kühlkanäle 65 % bis 95 % der äußeren Oberfläche des Kupferrohrs beanspruchen, wobei das Kupferrohr gleichzeitig über den gesamten Umfang und im Wesentlichen über die gesamte Länge mit einem Stützmantel versehen ist. Bei senkrecht oszillierenden Stranggießkokillen schlägt die DE 195 81 547 C2 vor, die Innenfläche mit Aussparungen oder Einsenkungen zu versehen, die in einem Abstand von 15 mm bis 200 mm unterhalb eines in einem stabilen Betriebszustand erfassten Gießspiegels angeordnet sind. Dadurch soll ebenfalls ein stabiles Gießen bei hoher Geschwindigkeit ermöglicht werden. Alle diese Ansätze tragen der realen Wärmestromverteilung nicht hinreichend Rechnung.A number of proposals have already been made in order to achieve as homogeneous a heat dissipation as possible and thus to create the conditions for a higher casting performance. For example, is from the DE 36 21 073 A1 a mold known in which only the arcuate side surfaces, but not the corner areas are provided with cooling grooves. The cooling should be increased, especially in the area of the casting mirror, as it is also in the DE 34 11 359 A1 is described. With the improvement of the cooling performance and the increase of the casting speed also the EP 1 468 760 B1 , which proposes that the cooling ducts occupy 65% to 95% of the outer surface of the copper pipe, the copper pipe being at the same time provided with a supporting jacket over the entire circumference and over substantially the entire length. In the case of vertically oscillating continuous casting molds, the DE 195 81 547 C2 to provide the inner surface with recesses or depressions, which are arranged at a distance of 15 mm to 200 mm below a recorded in a stable operating condition Gießspiegel. This should also enable a stable casting at high speed. All these approaches do not adequately reflect the real heat flow distribution.

Der Erfindung liegt ausgehend vom Stand der Technik die Aufgabe zugrunde, eine Kokille bereitzustellen, mit welcher die Homogenität der Strangabkühlung noch weiter gesteigert ist, um im Ergebnis höhere Gießleistungen und eine bessere Strangqualität zu realisieren und welche zudem dazu beiträgt, Spannungen innerhalb der Kokillenwandung zu reduzieren.The invention is based on the prior art based on the object to provide a mold with which the homogeneity of the strand cooling is further increased to realize higher casting performance and better strand quality as a result and which also helps to reduce stresses within the Kokillenwandung ,

Diese Aufgabe ist bei einer Kokille mit den Merkmalen des Patentanspruchs 1 gelöst.This object is achieved in a mold with the features of claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Advantageous embodiments of the invention are the subject of the dependent claims.

Wesentlich bei der erfindungsgemäßen Kokille ist, dass die Kühlwirkung der Kokille so optimiert ist, dass sie dem Wärmeangebot des Stranges entspricht, um dadurch zu einer gleichmäßigen Abkühlung zu kommen. Dieses wird dadurch erreicht, dass die Tiefe und/oder Breite der Kühlnuten in der Mitte einer Seitenwand der Kokille am größten ist und in Richtung der Eckbereiche der Seitenwand abnimmt. Entscheidend ist, dass die Querschnittsfläche der Kühlnuten im mittleren Bereich einer Seitenwand größer ist als im Randbereich einer Seitenwand. Es hat sich gezeigt, dass durch das Einbringen der Kühlnuten in der erfindungsgemäßen Art und Weise die in der Seitenwand auftretenden maximalen Vergleichsspannungen deutlich reduziert werden können. Ideal elastische Festigkeitsberechnungen haben bestätigt, dass die Vergleichsspannung um mehr als 30 % von 504 MPa auf 348 MPa reduziert werden kann. Diese Angabe bezieht sich auf einen Kokillenquerschnitt von 130x130 mm, wobei ein Kokillenrohr ohne Nuten einem Kokillenrohr mit den erfindungsgemäß ausgestalteten Nuten gegenübergestellt worden ist. Die auf diese Art erreichte Reduzierung der Spannungen im Kokillenrohr wirkt sich vorteilhaft auf die Standzeit aus und reduziert den thermisch bedingten Verzug des Kokillenrohres. Das erfindungsgemäße Kokillenrohr weist bei dieser Berechnung an jeder Seitenwand acht Nuten im Abstand von 5 mm mit einer sich in Gießrichtung erstreckenden Länge von 200 mm auf. Die mittleren Nuten besitzen eine Tiefe von 5 mm, wohingegen die äußeren Nuten eine Tiefe von 4 mm besitzen bei einer Breite von 12 mm bzw. 8 mm. In den Eckbereichen der Seitenwand sind keine Nuten angeordnet.Essential in the mold according to the invention is that the cooling effect of the mold is optimized so that it corresponds to the heat supply of the strand, thereby to come to a uniform cooling. This is achieved in that the depth and / or width of the cooling grooves in the middle of a side wall of the mold is largest and decreases in the direction of the corner regions of the side wall. It is crucial that the cross-sectional area of the cooling grooves in the middle region of a side wall is greater than in the edge region of a side wall. It has been shown that by introducing the cooling grooves in the manner according to the invention, the maximum comparison stresses occurring in the side wall can be significantly reduced. Ideal elastic strength calculations have confirmed that the comparative stress can be reduced by more than 30% from 504 MPa to 348 MPa. This information refers to a mold cross section of 130x130 mm, wherein a mold tube without grooves has been compared to a mold tube with the grooves designed according to the invention. The achieved in this way reducing the stresses in the mold tube has an advantageous effect on the life and reduces the thermally induced distortion of the mold tube. The mold tube according to the invention has in this calculation on each side wall eight grooves at a distance of 5 mm with a length extending in the casting direction of 200 mm. The middle grooves have a depth of 5 mm, whereas the outer grooves have a depth of 4 mm with a width of 12 mm and 8 mm, respectively. There are no grooves in the corner areas of the side wall.

Entscheidend für die konkrete Ausführung der Kühlnuten hinsichtlich ihrer Tiefe und Breite ist, dass die Kühlgeometrie dem von innen aufgeprägten Wärmestrom so gut wie möglich entspricht und dadurch ein weitgehend homogenes Temperaturfeld erreicht werden kann, was bislang nur unbefriedigend gelang. Wichtig ist, dass die Kühlnuten in der Mitte der Seitenwand, wo das Wärmeangebot am höchsten ist, tiefer und/oder breiter ausgeführt sind, also eine größere Querschnittsfläche besitzen, als in den eckenradiusnahen Bereichen.Decisive for the concrete design of the cooling grooves in terms of their depth and width is that the cooling geometry corresponds to the heat flow impressed from the inside as well as possible and thus a largely homogeneous temperature field can be achieved, which has so far only unsuccessfully succeeded. It is important that the cooling grooves are made deeper and / or wider in the middle of the side wall where the heat supply is highest, so have a larger cross-sectional area, as in the corner radius near areas.

Vorzugsweise sind in einem Abstand von 10 mm bis 15 mm vom Radiuseckenbereich keine Kühlnuten in der Seitenwand vorgesehen, um die Kühlung hier nicht zu erhöhen und die Steifigkeit der Kokille nicht unnötig zu schwächen. Die besten Ergebnisse können erreicht werden, wenn die Kühlnuten eine Tiefe von 3 mm - 6 mm aufweisen. Dabei soll eine Restwanddicke von 6 mm zwischen dem Kühlnutentiefsten und der Kokillenrohrinnenseite nicht unterschritten werden.Preferably, no cooling grooves are provided in the side wall at a distance of 10 mm to 15 mm from the radius corner region in order not to increase the cooling here and not to unnecessarily weaken the rigidity of the mold. The best results can be achieved if the cooling grooves have a depth of 3 mm - 6 mm. It should not fall below a residual wall thickness of 6 mm between the Kühlnutentiefsten and Kokillenrohrinnenseite.

Die Breite der Kühlnuten ist vorzugsweise zwischen 5 mm - 20 mm zu wählen.The width of the cooling grooves is preferably between 5 mm - 20 mm to choose.

Um die Anzahl der Kühlnuten an unterschiedliche Formate/Abmessungen der Kokillenrohre anzupassen, hat sich für die aufgeführten Nutenabmessungen eine Anzahl von 4 -10 Kühlnuten pro 100 mm Seitenfläche des Kokillenrohres als günstig erwiesen.In order to adapt the number of cooling grooves to different formats / dimensions of the mold tubes, a number of 4 -10 cooling grooves per 100 mm side surface of the mold tube has proved favorable for the groove dimensions listed.

Als strömungstechnisch besonders günstig werden sich Breiten-/Tiefenverhältnisse der Kühlnuten zwischen 1 und 4 angesehen. Davon abweichende Verhältnisse haben ungünstige Einflüsse auf die Strömungsverhältnisse und damit auf die Kühlleistung sowie die Steifigkeit des Kokillenrohrs im Badspiegelbereich. Die Kühlnuten werden im Nutengrund vorzugsweise mit einem kleinen Übergangsradius zu den Nutwänden versehen, um dort Spannungsspitzen zu vermeiden.As flow technology particularly favorable width / depth ratios of the cooling grooves between 1 and 4 are considered. Deviating conditions have unfavorable influences on the flow conditions and thus on the cooling capacity and the rigidity of the mold tube in the bathroom mirror area. The cooling grooves are preferably provided in the groove bottom with a small transition radius to the groove walls in order to avoid voltage peaks there.

Die Kühlnuten weisen idealerweise im Ein- und Auslaufbereich einen Radius auf, der zur Strömungsoptimierung des Kühlwassers und zur Reduzierung von Druckverlusten beiträgt.The cooling grooves ideally have a radius in the inlet and outlet areas, which contributes to the flow optimization of the cooling water and to the reduction of pressure losses.

Bei einer als günstig erachteten Anordnung der Kühlnuten beträgt ihr gegenseitiger, von der Nutmitte gemessener Abstand zwischen 10 mm und 25 mm. Ein Verhältnis von Nutmittenabstand zur Breite einer Kühlnut zwischen 1,2 bis 3 liefert überraschend gute Ergebnisse.In a favorable arrangement of cooling grooves their mutual, measured by the Nutmitte distance between 10 mm and 25 mm. A ratio of Nutmittenabstand to the width of a cooling groove between 1.2 to 3 provides surprisingly good results.

Grundsätzlich wird angestrebt, dass die Breite der Kühlnuten zur Mitte der Seitenwand hin größer wird und zudem auch die Tiefe zur Mitte hin zunimmt. Die unterschiedliche Kühinutengeometrie kann entweder durch spanende Bearbeitung der Kokille oder auch durch spanlose Bearbeitung beim Umformen der Kokille hergestellt werden.In principle, the aim is for the width of the cooling grooves to increase toward the middle of the side wall and, in addition, for the depth to increase toward the middle. The different Kühnutengeometrie can be prepared either by machining the mold or by cutting machining during forming of the mold.

Es ist günstig, wenn die Kühlnuten in einem Bereich angeordnet sind, der etwa 50 mm oberhalb der Gießspiegelsolllage beginnt und sich bis etwa 300 mm unter die Gießspiegelsolllage erstreckt, da in diesem Bereich die größten Wärmestromdichten auftreten und damit auch die Spannungen in der Seitenwand der Kokille maximal sind. In Gießrichtung tiefer liegende Bereiche, das heißt Bereiche in einem Abstand größer als 300 mm unterhalb der Gießspiegelsolllage müssen zwar ebenfalls gekühlt werden, allerdings ist aufgrund der bereits ausgebildeten Strangschale die Temperaturinhomogenität nicht so groß, als dass die erfindungsgemäß ausgestalteten Nuten zwingend in diesen unteren Bereichen erforderlich sind. Hervorragende Ergebnisse werden bereits dann erzielt, wenn die erfindungsgemäß ausgestalteten Nuten etwa 50 mm oberhalb der Gießspiegelsolllage beginnen und sich bis 300 mm unterhalb der Gießspiegelsolllage erstrecken.It is favorable if the cooling grooves are arranged in a region which begins about 50 mm above the target level and extends to about 300 mm below the target level, since in this region the greatest heat flux densities occur and thus also the stresses in the sidewall of the mold are maximum. In the casting direction deeper areas, ie areas at a distance greater than 300 mm below the Gießspiegelsolllage must indeed also be cooled, but due to the already formed strand shell, the temperature inhomogeneity is not so large that the inventively designed grooves mandatory in these lower areas required are. Outstanding results are already achieved when the inventively designed grooves start about 50 mm above the Gießspiegelsolllage and extend to 300 mm below the Gießspiegelsolllage.

Die Erfindung wird nachfolgend anhand eines in den Zeichnungen dargestellten Ausführungsbeispiels näher erläutert. Die Figuren 1a und 1b zeigen einmal in perspektivischer Darstellung und einmal in einer Vergrößerung der perspektivischen Darstellung ein Kokillenrohr 1, das in nicht näher dargestellter Weise in einem Wasserkasten positioniert ist. Das Besondere bei diesem Kokillenrohr 1 sind speziell konfigurierte Kühlnuten 2, die an der Außenfläche 3 des Kokillenrohrs 1 ausgebildet sind. Die Kühlnuten 2 erstrecken sich nicht über die gesamte Länge des Kokillenrohrs 1, sondern befinden sich ausschließlich im oberen, eingießseitigen Bereich des Kokillenrohrs 1. In diesem Ausführungsbeispiel besitzen die Kühlnuten 2 eine Länge von 200 mm. Die Kühlnuten 2 befinden sich im Bereich der Gießspiegelsolllage, wobei diese im oberen Viertel der dargestellten Kühlnuten 2 liegt. Das Besondere bei den Kühlnuten 2 dieses Kokillenrohrs ist, dass sie nicht alle gleich breit und tief sind, sondern sich sowohl in der Breite als auch in der Tiefe unterscheiden. In diesem Ausführungsbeispiel sind die äußeren, den Eckbereichen 4 zugewandten Kühlnuten 2a und 2b schmaler als die im mittleren Bereich der jeweiligen Seitenwand liegenden Kühlnuten 2c. Während die mittleren Kühlnuten 2c beispielsweise eine Breite von 12 mm haben, können die vier äußeren Kühlnuten 2a und 2b beispielsweise eine Breite von 8 mm haben. Alle Kühlnuten 2a, 2b, 2c besitzen die gleiche Länge. Es variiert jedoch nicht nur die Breite der Kühlnuten 2a, 2b, 2c, sondern auch deren Tiefe. Das ist daran zu erkennen, dass die Kühlnuten 2a, 2b, 2c im Ein- und Auslaufbereich, d.h. jeweils endseitig einen Radius 5 aufweisen. Der Übergang des Radius 5 zum Tiefsten der einzelnen Kühlnuten 2a, 2b, 2c ist durch eine horizontale Linie zu erkennen. Bei den mittleren Kühlnuten 2c ist die Tiefe erkennbar am größten. Die Tiefe der außenseitig benachbarten Kühlnuten 2b ist etwas kleiner. Die Tiefe ist bei den außenseitigen, den Eckbereichen 4 zugewandten Kühlnuten 2c am kleinsten.
Die Eckbereiche 4 sind nicht mit Kühlnuten versehen. Das Kokillenrohr wird mit einem nicht näher dargestellten Wasserleitblech im Wasserkasten befestigt, so dass das Kühlwasser in die einzelnen Kühlkanäle 2a, 2b, 2c gedrückt wird. Die Wasserleitbleche sind so angeordnet, dass das Kokillenrohr mittig im Wasserspalt gehalten wird.The invention will be explained in more detail with reference to an embodiment shown in the drawings. Figures 1a and 1b show once in perspective and once in an enlargement of the perspective view of a mold tube 1, which is positioned in a manner not shown in a water tank. The special feature of this mold tube 1 are specially configured cooling grooves 2, which are formed on the outer surface 3 of the mold tube 1. The cooling grooves 2 do not extend over the entire length of the mold tube 1, but are located exclusively in the upper, inflow-side region of the mold tube 1. In this embodiment, the cooling grooves 2 have a length of 200 mm. The cooling grooves 2 are located in the region of the Gießspiegelsolllage, which in the upper quarter of the illustrated cooling grooves. 2 lies. The special feature of the cooling grooves 2 of this Kokillenrohrs is that they are not all the same width and depth, but differ both in width and in depth. In this embodiment, the outer, the corner regions 4 facing cooling grooves 2a and 2b are narrower than the lying in the central region of the respective side wall cooling grooves 2c. For example, while the middle cooling grooves 2c have a width of 12 mm, the four outer cooling grooves 2a and 2b may have a width of 8 mm. All cooling grooves 2a, 2b, 2c have the same length. However, not only does the width of the cooling grooves 2a, 2b, 2c vary, but also their depth. This can be recognized by the fact that the cooling grooves 2a, 2b, 2c have a radius 5 in the inlet and outlet region, ie at each end. The transition of the radius 5 to the lowest of the individual cooling grooves 2a, 2b, 2c can be seen by a horizontal line. In the central cooling grooves 2c, the depth is recognizable to be greatest. The depth of the outside adjacent cooling grooves 2b is slightly smaller. The depth is the smallest at the outside, the corner regions 4 facing cooling grooves 2c.
The corner regions 4 are not provided with cooling grooves. The mold tube is fastened with a water guide plate not shown in the water tank, so that the cooling water is pressed into the individual cooling channels 2a, 2b, 2c. The water deflectors are arranged so that the mold tube is held centrally in the water gap.

Claims (11)

Kokille zum Stranggießen von Metall, wobei zumindest ein Teilbereich der Außenfläche (3) der Kokille mit Kühlnuten (2, 2c) versehen ist, dadurch gekennzeichnet, dass die Tiefe und/oder Breite der Kühlnuten (2, 2a, 2b, 2c) in der Mitte einer Seitenwand der Kokille (1) am größten ist und in Richtung der Eckbereiche der Seitenwand abnimmt.Mold for continuous casting of metal, wherein at least a portion of the outer surface (3) of the mold with cooling grooves (2, 2c) is provided, characterized in that the depth and / or width of the cooling grooves (2, 2a, 2b, 2c) in the Middle of a side wall of the mold (1) is greatest and decreases in the direction of the corner regions of the side wall. Kokille nach Anspruch 1, dadurch gekennzeichnet, dass in einem Abstand von 10 mm bis 15 mm vom Radius der Eckbereiche (4) keine Kühlnuten (2, 2a, 2b, 2c) in der Seitenwand angeordnet sind.Chill mold according to claim 1, characterized in that at a distance of 10 mm to 15 mm from the radius of the corner regions (4) no cooling grooves (2, 2a, 2b, 2c) are arranged in the side wall. Kokille nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Nutmittenabstand zweier Kühlnuten (2, 2a, 2b, 2c) in einem Bereich von 10 mm bis 25 mm liegt.Mold according to claim 1 or 2, characterized in that the Nutmittenabstand two cooling grooves (2, 2a, 2b, 2c) is in a range of 10 mm to 25 mm. Kokille nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das Verhältnis von Nutenmittenabstand zur Breite einer Kühlnut (2, 2a, 2b, 2c) in einem Bereich von 1, 2 bis 3 liegt.Chill mold according to one of claims 1 to 3, characterized in that the ratio of groove center distance to the width of a cooling groove (2, 2a, 2b, 2c) in a range of 1, 2 to 3. Kokille nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das Verhältnis zwischen der Breite und Tiefe einer Kühlnut (2, 2a, 2b, 2c) in einem Bereich von 1 bis 4 liegt.Chill mold according to one of claims 1 to 5, characterized in that the ratio between the width and depth of a cooling groove (2, 2a, 2b, 2c) is in a range of 1 to 4. Kokille nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Kühlnuten (2, 2a, 2b, 2c) eine Breite in einem Bereich von 5 mm bis 20 mm besitzen.Chill mold according to one of claims 1 to 6, characterized in that the cooling grooves (2, 2a, 2b, 2c) have a width in a range of 5 mm to 20 mm. Kokille nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Kühlnuten (2, 2a, 2b, 2c) in einem Bereich angeordnet sind, der 50 mm oberhalb der Gießspiegelsolllage beginnt und sich bis 300 mm unter die Gießspiegelsolllage erstreckt.Chill mold according to one of claims 1 to 7, characterized in that the cooling grooves (2, 2a, 2b, 2c) are arranged in a region which starts 50 mm above the Gießspiegelsolllage and extends to 300 mm below the Gießspiegelsolllage. Kokille nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Kühlnuten (2, 2a, 2b, 2c) eine Tiefe von 3 mm bis 8 mm aufweisen bei einer Restwandstärke im Bereich der Kühlnuten (2, 2a, 2b, 2c) von nicht weniger als 6 mm.Chill mold according to one of claims 1 to 7, characterized in that the cooling grooves (2, 2a, 2b, 2c) have a depth of 3 mm to 8 mm with a residual wall thickness in the region of the cooling grooves (2, 2a, 2b, 2c) of not less than 6 mm. Kokille nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass pro 100 mm Kokillenrohrseitenfläche vier bis zehn Kühlnuten (2, 2a, 2b, 2c) angeordnet sind.Mold according to one of claims 1 to 8, characterized in that per 100 mm Kokillenrohrseitenfläche four to ten cooling grooves (2, 2a, 2b, 2c) are arranged. Kokille nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Kühlnuten (2, 2a, 2b, 2c) im Nutgrund mit einem Übergangsradius zur Nutwand versehen sind.Chill mold according to one of claims 1 to 9, characterized in that the cooling grooves (2, 2a, 2b, 2c) are provided in the groove base with a transition radius to the groove wall. Kokille nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass Kühlnuten (2, 2a, 2b, 2c) in ihrem Ein- und Auslaufbereich einen Radius (5) aufweisen.Mold according to one of claims 1 to 10, characterized in that cooling grooves (2, 2a, 2b, 2c) have a radius (5) in their inlet and outlet areas.
EP06023082A 2005-12-05 2006-11-07 Mould for continuous casting of metal Not-in-force EP1792676B1 (en)

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DE102005058088 2005-12-05
DE102006001812A DE102006001812A1 (en) 2005-12-05 2006-01-12 Mold for continuous casting of metal

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WO2023041814A1 (en) * 2021-09-20 2023-03-23 Sarralle Steel Melting Plant, S.L. Continuous casting mold assembly

Also Published As

Publication number Publication date
JP5046626B2 (en) 2012-10-10
CN1978091A (en) 2007-06-13
RU2415731C2 (en) 2011-04-10
ATE453472T1 (en) 2010-01-15
ES2337281T3 (en) 2010-04-22
CN1978091B (en) 2011-04-13
RU2006142826A (en) 2008-06-10
CA2570085C (en) 2012-07-10
KR20070058968A (en) 2007-06-11
EP1792676B1 (en) 2009-12-30
JP2007152432A (en) 2007-06-21
DE502006005774D1 (en) 2010-02-11
US20070125512A1 (en) 2007-06-07
BRPI0605174A (en) 2007-10-09
DE102006001812A1 (en) 2007-06-06
CA2570085A1 (en) 2007-06-05

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