EP1819463B1 - Method for prolonging the serviceable life of the broad side walls of a mold - Google Patents

Method for prolonging the serviceable life of the broad side walls of a mold Download PDF

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Publication number
EP1819463B1
EP1819463B1 EP05783651A EP05783651A EP1819463B1 EP 1819463 B1 EP1819463 B1 EP 1819463B1 EP 05783651 A EP05783651 A EP 05783651A EP 05783651 A EP05783651 A EP 05783651A EP 1819463 B1 EP1819463 B1 EP 1819463B1
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EP
European Patent Office
Prior art keywords
casting
side walls
center axis
mold
continuous
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EP05783651A
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German (de)
French (fr)
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EP1819463A1 (en
Inventor
Herbert Höller
Johann PÖPPL
Guoxin Shan
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Primetals Technologies Austria GmbH
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Siemens VAI Metals Technologies GmbH and Co
Siemens VAI Metals Technologies GmbH Austria
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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
    • B22D11/05—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds into moulds having adjustable walls
    • 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
    • B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
    • B22D11/004—Copper alloys
    • 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
    • B22D11/14—Plants for continuous 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
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/168—Controlling or regulating processes or operations for adjusting the mould size or mould taper
    • 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 method for increasing the service life of the broad side walls of an adjusting mold formed by broad side walls and narrow side walls in a continuous casting plant for continuous casting of a metal strand.
  • the invention is therefore based on the prior art, the task of proposing a method with which the duration of use of a mold, especially when casting long sequences with the same casting width can be significantly extended.
  • the casting center axis is defined in the mold by equal distances to the narrow side walls and this G discernmittenachse continues in conventional continuous casting even in the middle of the strand emerging from the continuous casting mold and the strand guide of the casting continuous cast metal strand. It is therefore located in a plant longitudinal level. Now, if the G manmittenachse offset from its original position of a central plant longitudinal plane parallel to itself by a small amount, so the mold leaving the mold is offset by this small amount off-center promoted by the strand guide of the continuous casting.
  • the shifting of the casting center axis takes place by a synchronous displacement of the narrow side walls in the same direction between the broad side walls of the adjusting mold.
  • the already existing in an adjustment mold preferably hydraulically operated and controlled from the plant control level from adjusting used.
  • the continuous shifting of the casting center axis takes place between two predetermined range limits. Due to the continuous shifting of the casting center axis during the entire casting time within these range limits, there is a substantially uniform wear on the broad side walls of the mold in the areas that is coated by the edges of the narrow side walls. These range limits are defined in the computer program that controls the adjustment process.
  • the distance of the region boundaries is preferably between 10 mm and 50 mm.
  • the displacement movement of the G manmittenachse between the area boundaries and thus the narrow side walls along the broad side walls follows a steady curve, preferably a sinusoidal curve. However, other curves can be selected.
  • a second possible embodiment of the method according to the invention is achieved in that a plurality of operating points for the positioning of the G manmittenachse are set for discontinuous shifting of G manmittenachse between the narrow side walls and that after reaching a certain level of wear on the broad side wall at an operating point G manmittenachse is assigned to a new operating point.
  • the "specific wear value" in this case represents a threshold value of the wear for the change of the operating point.
  • a central operating point which corresponds to the setting of the G stealmittenachse on a conventional adjusting or continuous casting, on both sides of this central operating point at least one additional operating point provided, d , H.
  • the threshold value of Kokillenverschl is hereby set so that no deterioration of the surface quality of the metal strand in this area caused by this wear mark.
  • the distance between adjacent operating points is suitably at least between 5 mm and 50 mm.
  • the displacement movement between two operating points follows a continuous curve, preferably a sinusoid curve.
  • a continuous curve preferably a sinusoid curve.
  • other curves can be selected.
  • the filling of the adjustment mold with molten metal should be carried out centrally, so that the melt distribution and the flow conditions in the mold run substantially symmetrically and thus the cooling conditions are kept uniform.
  • the shifting of the casting center axis causes a slightly asymmetric melt supply, which hardly affects the flow conditions.
  • the supply of melt from the intermediate vessel arranged above the adjusting mold can be aligned with the position of the casting center axis.
  • the orientation of the supply of melt by a synchronous with the G stealmittenachse taking place lateral displacement of the tundish takes place. This calibration can be performed with the standard equipment provided on the continuous caster.
  • the position change of G manmittenachse is automatically performed by the process control system of the continuous casting.
  • the process computer assigned to the process control system has access to all essential data influencing factors that cause the wear with different intensity and can determine the optimum time for the displacement of the G manmittenachse with a matching mathematical model and give appropriate control signals to the adjustment of the narrow side walls of the adjustment.
  • control room of the continuous casting plant can manually intervene in the process control system and a control signal for shifting the casting center axis can be generated.
  • a preferred field of application of this invention is steel continuous casting.
  • FIGS. 1 In the representations of the FIGS. 1 is a Verstellkokille 1 in a continuous casting with broad side walls 2, 3 and with this between the wide side walls clamped arranged narrow side walls 4, 5 shown schematically.
  • Each narrow side wall is assigned two adjusting devices 6, 7 and 8, 9 arranged one above the other, with which the narrow side walls can be set to predetermined casting widths B and to a pouring-width-dependent casting cone in accordance with the production program.
  • the adjusting devices preferably comprise controllable pressure medium cylinders, which are controlled by a process computer on the plant control level 10.
  • the two narrow side walls 4, 5 are arranged symmetrically to G cummittenachse 11.
  • the supply of melt takes place in alignment with the pouring center axis 11.
  • the casting center axis 11 continues below the adjusting mold 1 in the casting direction through the strand guide of the continuous casting plant (not shown).
  • Fig. 2 shows a broad side wall 2 with the occurring when using a first embodiment of the method according to the invention on the melt side surface wide wedge-shaped wear marks 14 at a long casting time with constant casting width.
  • two virtual range limits G 1 , G 2 are provided, which are determined in a mathematical model and retrievable from the process computer. Starting from a central casting center axis 11 0, casting area centers 11 1 and 11 2 are assigned to this area boundaries at the same distance, at which orientation the position of the narrow side walls, not shown here, is oriented. Accordingly, a metal strand emerges from the adjusting mold, which in its positioning in the mold guide subsequent to the mold is fixed in its maximum deflections by the position-related casting widths B 1 and B 2 .
  • the cast strand emerges from the Mold with a narrow side position, which follows a sine curve 17 with a large wavelength and corresponds to the continuous narrow side movement in the mold. Due to the pendulum movement of the casting center axis in the adjustment range between the range limits, there is a comparatively low and largely uniform wear on the broad side walls, whereby the service life of the broad side walls is substantially increased.
  • Fig. 3 shows a broad side wall 2 with the occurring when using a second embodiment of the method according to the invention on the melt-side surface wedge-shaped wear marks with a long casting time with a constant casting width.
  • three virtual operating points P 0 , P 1 , P 2 are provided, which are determined in a mathematical model and retrievable from the process computer. Casting center axes 11 0 , 11 1 , 11 2 are assigned to these operating points at which the positions of the narrow side walls (not shown here) are oriented. Accordingly, a metal strand emerges from the adjusting mold, which in its positioning in the strand guide subsequent to the mold is fixed by the position-related casting widths B 0 , B 1 and B 2 .
  • the operating point P 0 which corresponds to the centered standard setting of a continuous casting plant, is assigned to the casting center axis 11 0 , in which the cast metal strand enters centrically with the position B 0 in the strand guide 13 indicated by dot-dash lines.
  • wear marks 14 which extend from the edges 14a in the direction of the casting center axis 11 0 occur .
  • the edge 14a is formed substantially along the line of contact of the narrow side wall with the broad side wall of the adjustment mold by the frictional action of the edge region of the forming cast strand on the broad side wall.
  • wear marks 15 are formed at the operating point P 1 and wear marks 16 at the operating point P 2 .
  • the total wear on the broad side wall by the shifting of the casting center axis 11 between the operating points P 0 , P 1 , P 2 is made uniform and minimized and thus significantly increases the service life of the broad side walls.

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  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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Abstract

The invention relates to a method for prolonging the serviceable life of the broad side walls of a mold, which is formed from broad side walls and narrow side walls, in a continuous casting installation for continuously casting a metal casting. In order to significantly prolong the serviceable life of a mold, in particular, for casting long sequences with the same casting width, the invention provides that a casting center axis (11, 11<sub

Description

Die Erfindung betrifft ein Verfahren zur Erhöhung der Lebensdauer der Breitseitenwände einer von Breitseitenwänden und Schmalseitenwänden gebildeten Verstellkokille in einer Stranggießanlage zum kontinuierlichen Gießen eines Metallstranges.The invention relates to a method for increasing the service life of the broad side walls of an adjusting mold formed by broad side walls and narrow side walls in a continuous casting plant for continuous casting of a metal strand.

Unter dem Einfluss der heißen Metallschmelze und der sich an den Kokillenwänden in Gießrichtung zunehmend ausbildenden Strangschale kommt es durch die Relativbewegung von Kokille und Metallstrang zu Verschleißerscheinungen an den Kokilleninnenwänden. Dieser Materialverschleiß nimmt in Richtung zur Kokillenausgangsseite stetig zu.Under the influence of the hot molten metal and the strand shell forming increasingly on the mold walls in the casting direction, the relatively movement of mold and metal strand causes signs of wear on the mold inner walls. This material wear increases steadily in the direction of Kokillenausgangsseite.

Um den Verschleiß der zumeist aus Kupfer oder einer Kupferlegierung gebildeten Kokilleninnenwände zu minimieren, ist es seit langem bekannt, die mit der Metallschmelze und den Strangschalen in Berührung kommenden Kokilleninnenwände mit den Verschleiß mindernden Schutzschichten auszustatten. Aus der EP 924 010 A1 ist es beispielsweise bekannt, eine aus einer aushärtbaren Kupferlegierung bestehende Kokillenwand mit einer Verschleißschutzschicht aus Chrom auszustatten und die Kokillenwand im Weiteren der Aushärtung zu unterziehen. Zur Verstärkung der verschleißmindernden Wirkung an der Kokillenausgangsseite wird in der US 4,688,320 vorgeschlagen, in den besonders verschleißanfälligen Bereichen eine dickere Nickelschicht vorzusehen, als in anderen, speziell thermisch höher beanspruchten Bereichen der Kokille.In order to minimize the wear of the mold inner walls mostly formed of copper or a copper alloy, it has long been known to equip the Kokilleninnenwände coming into contact with the molten metal and the strand bowls with the wear-reducing protective layers. From the EP 924 010 A1 For example, it is known to provide a mold wall consisting of a hardenable copper alloy with a wear protection layer of chromium and to subject the mold wall to curing thereafter. To reinforce the wear-reducing effect on Kokillenausgangsseite is in the US 4,688,320 proposed to provide a thicker nickel layer in the particularly wear-prone areas, as in other, especially higher thermal stress areas of the mold.

Werden mit einer Stranggießanlage, die mit einer Verstellkokille zum Gießen von Metallsträngen unterschiedlicher Strangbreite ausgestattet ist, über längere Perioden Metallstränge gleicher Strangbreite vergossen, so tritt in den Kantenbereichen von Breitseitenwand und Schmalseitenwand durch die Reibung der Strangkanten an den Breitseitenwänden an diesen in einem schmalen entlang der Kanten verlaufenden Bereich ein verstärkter Verschleiß auf. Dieses Verschleißbild zeigt sich unabhängig von den Verschleiß mindernden Maßnahmen, wie sie aus dem oben beschriebenen Stand der Technik bekannt sind. Die in Strangförderrichtung orientierten Verschließmarken können eine Tiefe von bis zu 3 mm erreichen und führen bei einem Formatwechsel (größere Gießbreite) zu Qualitätseinbußen an Strang und gegebenenfalls zum Komplettausfall der Kokille.Are cast with a continuous casting, which is equipped with an adjustment for casting metal strands of different strand width over long periods metal strands same strand width, so occurs in the edge regions of broad side wall and narrow side wall by the friction of the strand edges on the broad side walls of these in a narrow along the Edge extending area increased wear on. This wear pattern is independent of the wear-reducing measures, as they are known from the prior art described above. The closure markers oriented in the direction of the strand conveying direction can reach a depth of up to 3 mm and, in the case of a format change (larger casting width), lead to reduced quality of the strand and, if necessary, to complete failure of the mold.

Der Erfindung liegt daher ausgehend vom Stand der Technik die Aufgabe zugrunde, ein Verfahren vorzuschlagen, mit dem die Einsatzdauer einer Verstellkokille speziell beim Vergießen langer Sequenzen mit gleicher Gießbreite wesentlich verlängert werden kann.The invention is therefore based on the prior art, the task of proposing a method with which the duration of use of a mold, especially when casting long sequences with the same casting width can be significantly extended.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass mittig zwischen den Schmalseitenwänden einer Verstellkokille eine Gießmittenachse definiert wird und dass diese Gießmittenachse während des Gießens kontinuierlich oder diskontinuierlich parallel zu sich selbst verschoben wird.This object is achieved in that centrally between the narrow side walls of an adjusting a Gießmittenachse is defined and that this Gießmittenachse is continuously or discontinuously displaced parallel to itself during casting.

Die Gießmittenachse ist in der Kokille durch gleiche Abstände zu den Schmalseitenwänden definiert und diese Gießmittenachse setzt sich bei konventionellen Stranggießanlagen auch in der Strangmitte des aus der Stranggießkokille austretenden und die Strangführung der Gießanlage durchlaufenden gegossenen Metallstrang fort. Sie liegt demnach in einer Anlagenlängsebene. Wird nunmehr die Gießmittenachse aus ihrer Ursprungslage einer mittigen Anlagenlängsebene parallel zu sich selbst um einen kleinen Betrag versetzt, so wird auch der die Kokille verlassende Metallstrang um diesen kleinen Betrag versetzt außermittig durch die Strangführung der Stranggießanlage gefördert.The casting center axis is defined in the mold by equal distances to the narrow side walls and this Gießmittenachse continues in conventional continuous casting even in the middle of the strand emerging from the continuous casting mold and the strand guide of the casting continuous cast metal strand. It is therefore located in a plant longitudinal level. Now, if the Gießmittenachse offset from its original position of a central plant longitudinal plane parallel to itself by a small amount, so the mold leaving the mold is offset by this small amount off-center promoted by the strand guide of the continuous casting.

In der praktischen Umsetzung erfolgt das Verschieben der Gießmittenachse durch ein synchrones Verschieben der Schmalseitenwände in die gleiche Richtung zwischen den Breitseitenwänden der Verstellkokille. Hierzu werden die bei einer Verstellkokille bereits vorhandenen, vorzugsweise hydraulisch betriebenen und von der Anlagenleitebene aus gesteuerten Verstelleinrichtungen verwendet.In the practical implementation, the shifting of the casting center axis takes place by a synchronous displacement of the narrow side walls in the same direction between the broad side walls of the adjusting mold. For this purpose, the already existing in an adjustment mold, preferably hydraulically operated and controlled from the plant control level from adjusting used.

Nach einer ersten möglichen Ausführungsform des erfindungsgemäßen Verfahrens erfolgt das kontinuierliche Verschieben der Gießmittenachse zwischen zwei vorgegebenen Bereichsgrenzen. Durch das kontinuierliche Verschieben der Gießmittenachse während der gesamten Gießdauer innerhalb dieser Bereichsgrenzen kommt es zu einem weitgehend gleichmäßigen Verschleiß an den Breitseitenwände der Kokille in den Bereichen, die von den Kanten der Schmalseitenwände bestrichen wird. Diese Bereichsgrenzen sind in dem den Verstellvorgang regelnden Rechenprogramm festgelegt. Der Abstand der Bereichsgrenzen liegt vorzugsweise zwischen 10 mm und 50 mm.According to a first possible embodiment of the method according to the invention, the continuous shifting of the casting center axis takes place between two predetermined range limits. Due to the continuous shifting of the casting center axis during the entire casting time within these range limits, there is a substantially uniform wear on the broad side walls of the mold in the areas that is coated by the edges of the narrow side walls. These range limits are defined in the computer program that controls the adjustment process. The distance of the region boundaries is preferably between 10 mm and 50 mm.

Die Verschiebebewegung der Gießmittenachse zwischen den Bereichsgrenzen und damit der Schmalseitenwände entlang der Breitseitenwände folgt einem stetigen Kurvenverlauf, vorzugsweise einem Sinuskurvenverlauf. Allerdings können auch andere Kurvenverläufe gewählt werden.The displacement movement of the Gießmittenachse between the area boundaries and thus the narrow side walls along the broad side walls follows a steady curve, preferably a sinusoidal curve. However, other curves can be selected.

Eine zweite mögliche Ausführungsform des erfindungsgemäßen Verfahren wird dadurch erreicht, dass zum diskontinuierlichen Verschieben der Gießmittenachse zwischen den Schmalseitenwänden mehrere Betriebspunkte für die Positionierung der Gießmittenachse festgelegt werden und dass nach Erreichen eines bestimmten Verschleißwertes an der Breitseitenwand in einem Betriebspunkt die Gießmittenachse einem neuen Betriebspunkt zugeordnet wird. Der "bestimmte Verschleißwert" stellt hierbei einen Schwellwert des Verschleißes für den Wechsel des Betriebspunktes dar. Neben einem zentralen Betriebspunkt, der der Einstellung der Gießmittenachse an einer konventionellen Verstellkokille bzw. Stranggießanlage entspricht, sind beiderseits dieses zentralen Betriebspunktes mindestens je ein weiterer Betriebspunkt vorgesehen, d. h. im den Verstellvorgang regelnden Rechenprogramm festgelegt, die nach Erreichen eines Schwellwertes des Kokillenverschleißes im Betriebspunkt nacheinander eingestellt werden. Dadurch wird der lokal auftretende verstärkte Verschleiß über die Betriebsdauer der Breitseitenwand auf einen breiteren Bereich der Breitseitenwand verteilt und somit die Gesamtlebensdauer der Breitseitenwand grundsätzlich erhöht. Der Schwellwert des Kokillenverschleißes wird hierbei so angesetzt, dass durch diese Verschleißmarke noch keine Beeinträchtigung der Oberflächenqualität des Metallstranges in diesem Bereich entsteht. Der Abstand zwischen benachbarten Betriebspunkten liegt zweckmäßig mindestens zwischen 5 mm und 50 mm.A second possible embodiment of the method according to the invention is achieved in that a plurality of operating points for the positioning of the Gießmittenachse are set for discontinuous shifting of Gießmittenachse between the narrow side walls and that after reaching a certain level of wear on the broad side wall at an operating point Gießmittenachse is assigned to a new operating point. The "specific wear value" in this case represents a threshold value of the wear for the change of the operating point. In addition to a central operating point, which corresponds to the setting of the Gießmittenachse on a conventional adjusting or continuous casting, on both sides of this central operating point at least one additional operating point provided, d , H. set in the adjustment process regulating computer program, which are set in succession after reaching a threshold of Kokillenverschleißes at the operating point. As a result, the locally occurring increased wear over the service life of the broad side wall is distributed over a wider area of the broad side wall and thus the overall service life of the wide side wall is generally increased. The threshold value of Kokillenverschleißes is hereby set so that no deterioration of the surface quality of the metal strand in this area caused by this wear mark. The distance between adjacent operating points is suitably at least between 5 mm and 50 mm.

Vorzugsweise folgt die Verschiebebewegung zwischen zwei Betriebspunkten einem stetigen Kurvenverlauf, vorzugsweise einem Sinuskurvenverlauf. Allerdings können auch andere Kurvenverläufe gewählt werden.Preferably, the displacement movement between two operating points follows a continuous curve, preferably a sinusoid curve. However, other curves can be selected.

Unter Berücksichtigung spezifischer lokaler Gießbedingungen ist es zweckmäßig den bestimmten Verschleißwert durch verschleißbestimmende Einflussgrößen, wie die Gießzeit, die Gießlänge, die Chargenanzahl, die Gießgeschwindigkeit, oder ähnliche Einflussgrößen, zu bestimmen bzw. festzulegen, da die Schmelzentemperatur, die Strangdicke und auch andere Faktoren einen wesentlichen Einfluss auf die Ausbildung der Strangkante, insbesondere deren Temperatur, im Austrittsbereich der Kokille haben und damit auf die Intensität des Verschleißes.Taking into account specific local casting conditions, it is useful to determine the particular wear value through wear determining factors such as casting time, casting length, batch number, casting speed, or similar factors, as the melt temperature, strand thickness and other factors are significant Influence on the formation of the strand edge, in particular its temperature, in the exit region of the mold and thus on the intensity of wear.

Zweckmäßig soll die Befüllung der Verstellkokille mit Metallschmelze mittig erfolgen, damit die Schmelzenverteilung und die Strömungsverhältnisse in der Kokille weitgehend symmetrisch ablaufen und damit die Abkühlbedingungen gleichmäßig gehalten werden. Das Verschieben der Gießmittenachse bedingt eine geringfügig asymmetrische Schmelzenzufuhr, die sich auf die Strömungsverhältnisse kaum auswirkt. Zur Vermeidung derartiger Einflüsse kann die Schmelzenzufuhr aus dem oberhalb der Verstellkokille angeordneten Zwischengefäß auf die Position der Gießmittenachse ausgerichtet werden. Vorzugsweise erfolgt die Ausrichtung der Schmelzenzufuhr durch ein synchron mit der Gießmittenachse erfolgendes seitliches Verschieben des Zwischengefäßes. Diese Kalibrierung kann mit den standardmäßig an der Stranggießanlage vorgesehenen Einrichtungen durchgeführt werden.Expediently, the filling of the adjustment mold with molten metal should be carried out centrally, so that the melt distribution and the flow conditions in the mold run substantially symmetrically and thus the cooling conditions are kept uniform. The shifting of the casting center axis causes a slightly asymmetric melt supply, which hardly affects the flow conditions. To avoid such influences, the supply of melt from the intermediate vessel arranged above the adjusting mold can be aligned with the position of the casting center axis. Preferably, the orientation of the supply of melt by a synchronous with the Gießmittenachse taking place lateral displacement of the tundish takes place. This calibration can be performed with the standard equipment provided on the continuous caster.

Nach einer Gießunterbrechung muss der Gießvorgang in bekannter Weise mit einem Anfahrstrang neu gestartet werden. Sofern die Gießmittenachse nicht auf den zentralen Betriebspunkt eingestellt ist, ist es notwendig, dass der Anfahrstrangkopf des Anfahrstranges bei einem Neustart des Stranggießens auf die aktuelle Position der Gießmittenachse eingestellt wird.After a casting interruption of the casting process must be restarted in a known manner with a starter strand. If the casting center axis is not set to the central operating point, it is necessary that the Anfahrstrangkopf the Anfahrstranges is set at a restart of the continuous casting to the current position of Gießmittenachse.

Vorzugsweise wird der Positionswechsel der Gießmittenachse vom Prozessleitsystem der Stranggießanlage automatisch geführt. Der dem Prozessleitsystem zugeordnete Prozessrechner hat Zugriff auf alle wesentlichen Daten der Einflussfaktoren, die den Verschleiß mit unterschiedlicher Intensität verursachen und kann mit einem darauf abgestimmten mathematischen Modell den optimalen Zeitpunkt für die Verlagerung der Gießmittenachse ermitteln und entsprechende Steuersignale an die Verstelleinrichtungen der Schmalseitenwände der Verstellkokille geben.Preferably, the position change of Gießmittenachse is automatically performed by the process control system of the continuous casting. The process computer assigned to the process control system has access to all essential data influencing factors that cause the wear with different intensity and can determine the optimum time for the displacement of the Gießmittenachse with a matching mathematical model and give appropriate control signals to the adjustment of the narrow side walls of the adjustment.

Gleichermaßen kann von der Steuerwarte der Stranggießanlage manuell in das Prozessleitsystem eingegriffen werden und ein Steuersignal zur Verlagerung der Gießmittenachse generiert werden.Equally, the control room of the continuous casting plant can manually intervene in the process control system and a control signal for shifting the casting center axis can be generated.

Ein bevorzugtes Anwendungsgebiet dieser Erfindung ist das Stahlstranggießen.A preferred field of application of this invention is steel continuous casting.

Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der nachfolgenden Beschreibung nicht einschränkender Ausführungsbeispiele, wobei auf die beiliegenden Figuren Bezug genommen wird, die folgendes zeigen:

Fig. 1
eine Verstellkokille nach dem Stand der Technik in einer Ansicht von oben und in einem Längsschnitt entlang der Schnittlinie A - A,
Fig. 2
eine Breitseitenwand einer Verstellkokille mit den Verschleißbildern bei einer kontinuierlichen Verschiebebewegung der Gießmittenachse zwischen zwei Bereichsgrenzen nach einer ersten Ausführungsform der Erfindung,
Fig. 3
eine Breitseitenwand einer Verstellkokille mit den Verschleißbildern bei drei erfindungsgemäßen Betriebspunkten der Gießmittenachse nach einer zweiten Ausführungsform der Erfindung.
Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the attached figures, which show:
Fig. 1
a prior art adjustment mold in a view from above and in a longitudinal section along the section line A - A,
Fig. 2
a broad side wall of an adjustment mold with the wear patterns in a continuous displacement movement of the casting center axis between two area boundaries according to a first embodiment of the invention,
Fig. 3
a broad side wall of an adjustment mold with the wear patterns at three operating points of the casting center axis according to the invention according to a second embodiment of the invention.

In den Darstellungen der Figuren 1 ist eine Verstellkokille 1 in einer Stranggießanlage mit Breitseitenwänden 2, 3 und mit zwischen diesen Breitseitenwänden klemmbar angeordneten Schmalseitenwänden 4, 5 schematisch dargestellt. Jeder Schmalseitenwand sind zwei übereinander angeordnete Verstelleinrichtungen 6, 7 und 8, 9 zugeordnet, mit denen die Schmalseitenwände auf vorgegebene Gießbreiten B und auf einen gießbreitenabhängigen Gießkonus entsprechend dem Produktionsprogramm eingestellt werden können. Die Verstelleinrichtungen umfassen vorzugsweise regelbare Druckmittelzylinder, die von einem Prozessrechner auf der Anlagenleitebene 10 gesteuert werden. Die beiden Schmalseitenwände 4, 5 sind zur Gießmittenachse 11 symmetrisch angeordnet. Wird nur ein Tauchgießrohr 12 für die Schmelzenzufuhr vorgesehen, so erfolgt die Schmelzenzufuhr fluchtend mit der Gießmittenachse 11. Die Gießmittenachse 11 setzt sich unterhalb der Verstellkokille 1 in Gießrichtung durch die nicht näher dargestellte Strangführung der Stranggießanlage fort.In the representations of the FIGS. 1 is a Verstellkokille 1 in a continuous casting with broad side walls 2, 3 and with this between the wide side walls clamped arranged narrow side walls 4, 5 shown schematically. Each narrow side wall is assigned two adjusting devices 6, 7 and 8, 9 arranged one above the other, with which the narrow side walls can be set to predetermined casting widths B and to a pouring-width-dependent casting cone in accordance with the production program. The adjusting devices preferably comprise controllable pressure medium cylinders, which are controlled by a process computer on the plant control level 10. The two narrow side walls 4, 5 are arranged symmetrically to Gießmittenachse 11. If only one submersible pouring tube 12 is provided for the supply of melt, then the supply of melt takes place in alignment with the pouring center axis 11. The casting center axis 11 continues below the adjusting mold 1 in the casting direction through the strand guide of the continuous casting plant (not shown).

Fig. 2 zeigt eine Breitseitenwand 2 mit den bei Anwendung einer ersten Ausführungsform des erfindungsgemäßen Verfahrens auf der schmelzenseitigen Oberfläche auftretenden breiten keilförmigen Verschleißmarken 14 bei langer Gießdauer mit konstanter Gießbreite. An der Verstellkokille sind zwei virtuelle Bereichsgrenzen G1, G2 vorgesehen, die in einem mathematischen Modell festgelegt und vom Prozessrechner abrufbar sind. Diesen Bereichsgrenzen sind ausgehend von einer zentralen Gießmittenachse 110 in gleichem Abstand Gießmittenachsen 111, und 112 zugeordnet, an denen sich die Position der hier nicht dargestellten Schmalseitenwände orientiert. Dementsprechend tritt aus der Verstellkokille ein Metallstrang aus, der in seiner Positionierung in der der Kokille nachfolgenden Strangführung in seinen maximalen Auslenkungen durch die positionsbezogenen Gießbreiten B1 und B2 festgelegt ist. Der gegossene Strang tritt aus der Kokille mit einer Schmalseitenposition aus, die einer Sinuskurve 17 mit großer Wellenlänge folgt und der kontinuierlichen Schmalseitenbewegung in der Kokille entspricht. Durch die Pendelbewegung der Gießmittenachse im Verstellbereich zwischen den Bereichsgrenzen kommt es zu einem vergleichsweise geringen und weitgehend gleichmäßigen Verschleiß an den Breitseitenwänden, wodurch die Einsatzdauer der Breitseitenwände wesentlich erhöht wird. Fig. 2 shows a broad side wall 2 with the occurring when using a first embodiment of the method according to the invention on the melt side surface wide wedge-shaped wear marks 14 at a long casting time with constant casting width. At the adjusting mold two virtual range limits G 1 , G 2 are provided, which are determined in a mathematical model and retrievable from the process computer. Starting from a central casting center axis 11 0, casting area centers 11 1 and 11 2 are assigned to this area boundaries at the same distance, at which orientation the position of the narrow side walls, not shown here, is oriented. Accordingly, a metal strand emerges from the adjusting mold, which in its positioning in the mold guide subsequent to the mold is fixed in its maximum deflections by the position-related casting widths B 1 and B 2 . The cast strand emerges from the Mold with a narrow side position, which follows a sine curve 17 with a large wavelength and corresponds to the continuous narrow side movement in the mold. Due to the pendulum movement of the casting center axis in the adjustment range between the range limits, there is a comparatively low and largely uniform wear on the broad side walls, whereby the service life of the broad side walls is substantially increased.

Fig. 3 zeigt eine Breitseitenwand 2 mit den bei Anwendung einer zweiten Ausführungsform des erfindungsgemäßen Verfahrens auf der schmelzenseitigen Oberfläche auftretenden keilförmigen Verschleißmarken bei langer Gießdauer mit konstanter Gießbreite. An der Verstellkokille sind drei virtuelle Betriebspunkte P0, P1, P2 vorgesehen, die in einem mathematischen Modell festgelegt und vom Prozessrechner abrufbar sind. Diesen Betriebspunkten sind Gießmittenachsen 110, 111, 112 zugeordnet, an denen sich die Positionen der hier nicht dargestellten Schmalseitenwände orientieren. Dementsprechend tritt aus der Verstellkokille ein Metallstrang aus, der in seiner Positionierung in der der Kokille nachfolgenden Strangführung durch die positionsbezogenen Gießbreiten B0, B1 und B2 festgelegt ist. Dem Betriebspunkt P0, der der zentrierten Standardeinstellung einer Stranggießanlage entspricht, ist die Gießmittenachse 110 zugeordnet, bei der der gegossene Metallstrang zentrisch mit der Position B0 in die durch strichpunktierte Linien angedeutete Strangführung 13 eintritt. In diesem Fall treten Verschleißmarken 14 auf, die sich von den Kanten 14a in Richtung zur Gießmittenachse 110 erstrecken. Die Kante 14a entsteht im Wesentlichen entlang der Berührungslinie der Schmalseitenwand mit der Breitseitenwand der Verstellkokille durch die Reibungswirkung des Kantenbereiches des sich bildenden Gussstranges auf der Breitseitenwand. Analog bilden sich Verschleißmarken 15 im Betriebspunkt P1 und Verschleißmarken 16 im Betriebspunkt P2 aus. Insgesamt wird der Gesamtverschleiß an der Breitseitenwand durch das Verschieben der Gießmittenachse 11 zwischen den Betriebspunkten P0, P1, P2 vergleichmäßigt und minimiert und damit die Einsatzdauer der Breitseitenwände wesentlich erhöht.. Fig. 3 shows a broad side wall 2 with the occurring when using a second embodiment of the method according to the invention on the melt-side surface wedge-shaped wear marks with a long casting time with a constant casting width. At the adjustment mold three virtual operating points P 0 , P 1 , P 2 are provided, which are determined in a mathematical model and retrievable from the process computer. Casting center axes 11 0 , 11 1 , 11 2 are assigned to these operating points at which the positions of the narrow side walls (not shown here) are oriented. Accordingly, a metal strand emerges from the adjusting mold, which in its positioning in the strand guide subsequent to the mold is fixed by the position-related casting widths B 0 , B 1 and B 2 . The operating point P 0 , which corresponds to the centered standard setting of a continuous casting plant, is assigned to the casting center axis 11 0 , in which the cast metal strand enters centrically with the position B 0 in the strand guide 13 indicated by dot-dash lines. In this case, wear marks 14 which extend from the edges 14a in the direction of the casting center axis 11 0 occur . The edge 14a is formed substantially along the line of contact of the narrow side wall with the broad side wall of the adjustment mold by the frictional action of the edge region of the forming cast strand on the broad side wall. Similarly, wear marks 15 are formed at the operating point P 1 and wear marks 16 at the operating point P 2 . Overall, the total wear on the broad side wall by the shifting of the casting center axis 11 between the operating points P 0 , P 1 , P 2 is made uniform and minimized and thus significantly increases the service life of the broad side walls.

Claims (10)

  1. Method for prolonging the serviceable life of the broad side walls of a mold formed by broad side walls (2, 3) and narrow side walls (4, 5) in a continuous casting plant for the continuous casting of a metal strand, characterized in that a casting center axis (11, 110, 111, 112) is defined centrally between the narrow side walls, and in that this casting center axis, together with the narrow side walls, is displaced parallel to itself during casting continuously synchronously or discontinuously between the broad side walls.
  2. Method according to claim 1, characterized in that the continuous displacement of the casting center axis takes place between two range limits (G1, G2),
  3. Method according to claim 2, characterized in that a displacement movement between the range limits follows a continuous curve profile, preferably a sine curve profile.
  4. Method according to claim 1, characterized in that, for the discontinuous displacement of the casting center axis between the narrow side walls, a plurality of operating points (P0, P1, P2) for positioning the casting center axis are fixed, and in that, after a specific wear value on the broad side wall has been reached at one operating point, the casting center axis is assigned to a new operating point.
  5. Method according to claim 4, characterized in that a displacement movement between two operating points follows a continuous curve profile, preferably a sine curve profile.
  6. Method according to claim 4 or 5, characterized in that the specific wear value is determined by means of wear-determining influencing variables, such as the casting time, casting length, number of batches and casting speed, or similar influencing variables.
  7. Method according to one of the preceding claims, characterized in that the melt feed out of the tundish arranged above the mold is aligned with the position of the casting center axis.
  8. Method according to claim 7, characterized in that the alignment of the melt feed takes place by means of a lateral displacement of the tundish occurring synchronously with the casting center axis.
  9. Method according to one of the preceding claims, characterized in that, in the event of a restart of continuous casting, the dummy strand head of the dummy strand is set to the current position of the casting center axis.
  10. Method according to one of the preceding claims, characterized in that the position change of the casting center axis is controlled automatically by a process computer of the process management system (10).
EP05783651A 2004-10-13 2005-09-16 Method for prolonging the serviceable life of the broad side walls of a mold Not-in-force EP1819463B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0170704A AT500814B1 (en) 2004-10-13 2004-10-13 METHOD FOR INCREASING THE LIFE OF THE WIDE-SIDED WALLS OF AN ADJUSTING COCKILLE
PCT/EP2005/010032 WO2006042603A1 (en) 2004-10-13 2005-09-16 Method for prolonging the serviceable life of the broad side walls of a mold

Publications (2)

Publication Number Publication Date
EP1819463A1 EP1819463A1 (en) 2007-08-22
EP1819463B1 true EP1819463B1 (en) 2008-07-09

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EP05783651A Not-in-force EP1819463B1 (en) 2004-10-13 2005-09-16 Method for prolonging the serviceable life of the broad side walls of a mold

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KR (1) KR20070073901A (en)
CN (1) CN100592944C (en)
AT (2) AT500814B1 (en)
DE (1) DE502005004678D1 (en)
WO (1) WO2006042603A1 (en)

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AT506673B1 (en) 2008-05-13 2012-07-15 Siemens Vai Metals Tech Gmbh METHOD FOR LIQUID HOLDING ON A CAST METAL STRUCTURE IN A CONTINUOUS CASTING SYSTEM AND CONTINUOUS CASTING SYSTEM THEREFOR
CN104801683A (en) * 2015-04-17 2015-07-29 钢铁研究总院 Narrow-side copper plate for reducing on-line width regulating resistance of plate blank crystallizer
CN113523207A (en) * 2021-08-19 2021-10-22 常州市发振机械股份有限公司 Steel ingot mould that can assemble

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Publication number Priority date Publication date Assignee Title
JPS5216449B2 (en) * 1972-08-14 1977-05-10
DE3604818A1 (en) * 1986-02-15 1987-08-20 Mannesmann Ag MOTOR CONTROL FOR THE ADJUSTMENT OF A NARROW-SIDE PLATE OF CONTINUOUS CASTING MILLS FOR METAL, ESPECIALLY FOR STEEL
DE3908328A1 (en) * 1989-03-10 1990-09-13 Mannesmann Ag CONICITY CONTROL DEVICE
EP0448752B1 (en) * 1990-03-27 1995-05-24 Siemens Aktiengesellschaft Device for position-control of machine parts in metallurgical plants
JP2639758B2 (en) * 1991-08-01 1997-08-13 新日本製鐵株式会社 How to start slab continuous casting
DE19748305A1 (en) * 1997-10-31 1999-05-06 Schloemann Siemag Ag Continuous casting mold
DE19756164A1 (en) * 1997-12-17 1999-06-24 Km Europa Metal Ag Process for producing a mold body and mold body
DE19933026A1 (en) * 1999-07-15 2001-01-18 Sms Demag Ag Continuous casting mold

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AT500814A1 (en) 2006-04-15
CN101039765A (en) 2007-09-19
EP1819463A1 (en) 2007-08-22
CN100592944C (en) 2010-03-03
KR20070073901A (en) 2007-07-10
ATE400381T1 (en) 2008-07-15
DE502005004678D1 (en) 2008-08-21
AT500814B1 (en) 2006-11-15
WO2006042603A1 (en) 2006-04-27

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