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EP0234491A2 - Method of terminating the casting operation in a steel strip casting plant - Google Patents

Method of terminating the casting operation in a steel strip casting plant Download PDF

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Publication number
EP0234491A2
EP0234491A2 EP87102281A EP87102281A EP0234491A2 EP 0234491 A2 EP0234491 A2 EP 0234491A2 EP 87102281 A EP87102281 A EP 87102281A EP 87102281 A EP87102281 A EP 87102281A EP 0234491 A2 EP0234491 A2 EP 0234491A2
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EP
European Patent Office
Prior art keywords
pouring
casting
mold
speed
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP87102281A
Other languages
German (de)
French (fr)
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EP0234491A3 (en
EP0234491B1 (en
Inventor
Günter Dr. Flemming
Manfred Kolakowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Schloemann Siemag AG
Schloemann Siemag AG
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Publication date
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Priority to AT87102281T priority Critical patent/ATE56898T1/en
Publication of EP0234491A2 publication Critical patent/EP0234491A2/en
Publication of EP0234491A3 publication Critical patent/EP0234491A3/en
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Publication of EP0234491B1 publication Critical patent/EP0234491B1/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
    • 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
    • B22D11/20—Controlling or regulating processes or operations for removing cast stock
    • B22D11/201—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level
    • B22D11/202—Controlling or regulating processes or operations for removing cast stock responsive to molten metal level or slag level by measuring temperature
    • 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
    • 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
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature

Definitions

  • the invention relates to a procedure for terminating the casting operation of a Stahlbandg manstrom with an ingot mold with cooled narrow side walls and wide side walls, which for receiving a pouring tube above a format-determining P a-rallelab bainiteses in the region of the wide side walls has an upwardly extended pouring.
  • the heat-insulating slag cannot be removed due to the poor accessibility of the narrow mold opening, which means that it emerges from the mold to contaminate strand guide elements and under the action of sprayed cooling water puffs comes.
  • the object of the invention is to provide a reliable method for ending the casting operation which is suitable for steel strip casting plants, whereby sticking of the cast strip in the pouring area or a shell breakthrough and deflagrations at the end face of the strip and slag contamination are avoided when it comes out of the mold.
  • the object is achieved according to the invention in that the strip take-off speed and the pouring speed are reduced to a value v Bm at which the solidification zone remains directly below the format-determining parallel section and that after the steel supply has been switched off and the tracked casting level has left the pouring area, the strip pull-off speed is reduced to a value v Br at which the casting level forms a final solidification shell within the format-determining parallel section.
  • the new method enables regulation and automation of the process for ending the casting, which relieves the operating personnel, avoids operating errors and improves overall operational safety.
  • the method takes into account in particular the fact that within the metal sump a heterogeneous zone of the Crystal growth forms. Different growth of the crystals of opposing walls can lead to the formation of bridges in the pouring area, which oppose a reduction in the strip thickness and hinder the strip outfeed.
  • the band is prevented from becoming stuck in the pouring area and deflagrations when the band end emerges from the mold.
  • the minimum take-off speed v Bm is 1.5 m / min.
  • the respective height of the mold level is advantageously determined by measuring the temperature within the mold walls.
  • the altitude 'of G gosumpfendes is determined by continuous force measurement at the wide side surface of the strip immediately underneath the chill mold.
  • the height position of the G conceivablsumpfendes may alternatively be determined by continuous ultrasonic measurement in strip thickness direction immediately below the mold.
  • a steel strip caster for performing the method has several thermal sensors in the pouring area and in the parallel area of the broad side walls of the mold. In order to determine the end of the casting sump, strand guide elements immediately downstream of the mold are provided with force sensors.
  • molten steel 1 flows from a casting tank 2 from a height-adjustable stopper 3, regulated by a pouring tube 4, into a mold 5 which is formed by two opposite broad side walls 6 and two narrow side walls 7. Broad side walls 6 and narrow side walls 7 are provided with cooling channels 8. An oscillation device for the mold is indicated by arrows 9.
  • the broad side walls 6 form, above a format-determining parallel section 10, a pouring region 11 which widens upwards to accommodate the pouring tube 4.
  • the molten steel 1 flowing into the mold 5 at the start of casting connects to a start-up head 12 which is fastened to a start-up line 13.
  • the pouring level 14 that forms rises above the lateral outflow openings 15 ′ of the pouring tube 4.
  • Thermosensors 16 are provided in the broad side walls to determine the current height of the casting level 14.
  • the starting strand 13 is located in a strand guide consisting of rollers 17 and arranged downstream of the mold.
  • a driver 18 for conveying the start strand 13 and then the cast steel strip 25 is arranged.
  • a measuring device 19 for determining the force acting on the band shell 22 from the ferrostatic pressure is arranged directly below the mold 5. Force sensors 19 can be used for this purpose.
  • the measurement data of the thermal sensors 16 and force sensors 19 are fed to a process computer 20 which, after comparison of the target value and actual value, determines the required strip take-off speed v B for the drivers 18 and the corresponding pouring speed v E for the actuator 21 of the stopper 3.
  • the liquid steel solidifies on the cooled broad side walls 6 and narrow side walls 7 of the mold 5 to form band shells 22, the thickness of which increases downwards.
  • the belt shells 22 which form on the broad side walls 6 in the area of the extended entry area 11 are brought closer to one another in the course of the lowering movement to the format-determining parallel section 10.
  • Fig. 3 The termination of the casting operation according to the invention is shown in Fig. 3 in phases A-C, C-D, E-F and F-G and in Fig. 4 in diagrams for the casting speed v E and the strip take-off speed v B synchronously.
  • v E and v B are coordinated at a high level in terms of the same pouring and withdrawal volumes.
  • the pouring speed v E and the strip take-off speed v B are uniformly reduced from.A to B to a value v Em , v Bm at which the casting sump end 23 remains outside the parallel section 10.
  • the melt feed is switched off, whereupon the casting level 14 sinks.
  • the strip take-off speed is reduced to a value v Br , at which the casting level forms a solidification shell 24 (E-F) within the parallel section 10.
  • the strip withdrawal speed v B is increased again for the rapid discharge of the strip 25 (G).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Coating With Molten Metal (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

Bei einem Verfahren zur Beendigung des Gießbetriebes einer Stahlbandgießanlage mit einer Kokille mit gekühlten Schmalseitenwänden und Breitseitenwänden, die zur Aufnahme eines Gießrohres oberhalb eines formatbestimmenden Parallelabschnittes im Bereich der Breitseitenwände einen nach oben erweiterten Eingießbereich aufweist, wird ein Steckenbleiben des gegossenen Bandes oder ein Schalendurchbruch dadurch vermieden, daß die Bandabzugsgeschwindigkeit vB und die Eingießgeschwindigkeit VE bis auf einen Wert VBm, vEm reduziert wird, bei welchem das Gießsumpfende (23) unmittelbar unterhalb des formatbestimmenden Parallelabschnittes (10) bleibt und daß nach der Abschaltung der Stahlzufuhr und dem Austreten des wegverfolgten Gießspiegels (14) aus dem Eingießbereich (11) die Bandabzugsgeschwindigkeit vB auf einen Wert VBr reduziert wird, bei welchem der Gießspiegel (14) innerhalb des formatbestimmenden Parallelabschnittes (10) eine abschließende Erstarrungsschale (24) bildet.

Figure imgaf001
In a method for ending the casting operation of a steel strip casting installation with a mold with cooled narrow side walls and broad side walls, which has an upwardly enlarged pouring area for accommodating a pouring tube above a format-determining parallel section in the area of the wide side walls, this prevents the cast strip from getting stuck or a shell breakthrough. that the strip take-off speed v B and the pouring speed V E are reduced to a value V Bm , v Em , at which the pouring sump end (23) remains immediately below the format-determining parallel section (10) and that after the steel supply has been switched off and the tracked part has escaped Casting level (14) from the pouring area (11), the strip take-off speed v B is reduced to a value V Br , at which the leveling level (14) forms a final solidification shell (24) within the format-determining parallel section (10).
Figure imgaf001

Description

Die Erfindung betrifft ein Verfahren zur Beendigung des Gießbetriebes einer Stahlbandgießanlage mit einer Kokille mit gekühlten Schmalseitenwänden und Breitseitenwänden, die zur Aufnahme eines Gießrohres oberhalb eines formatbestimmenden Pa-rallelabschnittes im Bereich der Breitseitenwände einen nach oben erweiterten Eingießbereich aufweist.The invention relates to a procedure for terminating the casting operation of a Stahlbandgießanlage with an ingot mold with cooled narrow side walls and wide side walls, which for receiving a pouring tube above a format-determining P a-rallelabschnittes in the region of the wide side walls has an upwardly extended pouring.

Durch die DE-PS 887 990 ist es bekannt, beim Stranggießen von dünnen Brammen in einer Kokille mit erweitertem Eingießbereich, die Gießbedingungen so festzulegen, daß der flüssige Metallsumpf sich bis in den Parallelabschnitt erstreckt.From DE-PS 887 990 it is known, when continuously casting thin slabs in a mold with an enlarged pouring area, to determine the casting conditions so that the liquid metal sump extends into the parallel section.

Bei bekannten Stahlstranggießanlagen wir2fIzur Beendigung des Gießbetriebes das Eingießvolumen und das Strangabzugsvolumen stark reduziert, damit die Schlacke vom Gießspiegel entfernt werden kann und damit ausreichend Zeit zur deckelartigen Erstarrung der Strangstirnseite zur Verfügung steht. Auf diese Art kann der Gießbetrieb einer Stahlbandgießkokille mit erweiterten Eingießbereich nicht beendet werden, da eine starke Verringerung der Bandabzugsgeschwindigkeit zur Durcherstarrung oder Deckelbildung und zur Bandverklemmung im erweiterten Eingießbereich führt. Es wurde festgestellt, daß ein unzulässig hoher, zum Durchbruch führender Ausziehwiderstand selbst dann auftreten kann, wenn der flüssige Metallsumpf sich bis in den Parallelabschnitt der Kokille erstreckt.In known steel continuous casting plants, the pouring volume and the strand withdrawal volume are greatly reduced at the end of the casting operation, so that the slag can be removed from the casting level and thus sufficient time is available for the lid-like solidification of the end face of the strand. In this way, the casting operation of a steel strip casting mold with an extended pouring area cannot be ended, since a strong reduction in the strip withdrawal speed leads to solidification or lid formation and to band jamming in the extended pouring region. It has been found that an inadmissibly high pull-out resistance leading to breakthrough can occur even if the liquid metal sump extends into the parallel section of the mold.

Erschwerend bei Beendigung des Gießbetriebes einer Stahlbandgießanlage wirkt ferner, daß wegen der schlechten Zugänglichkeit der schmalen Kokillenöffnung die wärmeisolierende Schlacke nicht entfernt werden kann, wodurch es beim Austritt aus der Kokille zur Verschmutzung von Strangführungselementen und unter der Einwirkung von aufgesprühtem Kühlwasser zu Verpuffungen kommt.To make matters worse at the end of the casting operation of a steel strip caster, the heat-insulating slag cannot be removed due to the poor accessibility of the narrow mold opening, which means that it emerges from the mold to contaminate strand guide elements and under the action of sprayed cooling water puffs comes.

Aufgabe der Erfindung ist die Schaffung eines für Stahlbandgießanlagen geeigneten, betriebssicheren Verfahrens zur Beendigung des Gießbetriebes, wobei ein Steckenbleiben des gegossenen Bandes im Eingießbereich oder ein Schalendurchbruch und beim Austritt aus der Kokille Verpuffungen an der Bandstirnseite und Schlackenverunreinigungen vermieden werden.The object of the invention is to provide a reliable method for ending the casting operation which is suitable for steel strip casting plants, whereby sticking of the cast strip in the pouring area or a shell breakthrough and deflagrations at the end face of the strip and slag contamination are avoided when it comes out of the mold.

Die gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Bandabzugsgeschwindigkeit und die Eingießgeschwindigkeit bis auf einen Wert vBm reduziert wfrd bei welchem die Durcherstarrungszone unmittelbar unterhalb des formatbestimmenden Parallelabschnittes bleibt und daß nach der Abschaltung der Stahlzufuhr und dem Austreten des wegverfolgten Gießspiegels aus dem Eingießbereich die Bandabzugsgeschwindigkeit auf einen Wert vBr reduziert wird, bei welchem der Gießspiegel innerhalb des formatbestimmenden Parallelabschnittes eine abschließende Erstarrungsschale bildet.The object is achieved according to the invention in that the strip take-off speed and the pouring speed are reduced to a value v Bm at which the solidification zone remains directly below the format-determining parallel section and that after the steel supply has been switched off and the tracked casting level has left the pouring area, the strip pull-off speed is reduced to a value v Br at which the casting level forms a final solidification shell within the format-determining parallel section.

Das neue Verfahren ermöglicht eine Regelung und Automatisierung des Vorganges zur Beendigung des Gießens, wodurch das Bedienungspersonal entlastet, Bedienungsfehler vermieden und die Betriebssicherheit insgesamt verbessert wfrd en Das Verfahren trägt insbesondere der Tatsache Rechnung, daß sich innerhalb des Metallsumpfes ausgehend von der Strangschale eine heterogene Zone des Kristallwachstums ausbildet. Dabei kann es durch unterschiedliches Wachstum der Kristalle gegenüberliegender Wandungen bereits im Eingießbereich zur Bildung von Brücken kommen, die einer Reduzierung der Banddicke einen Widerstand entgegensetzen und die Bandausförderung behindern. Bei der vorgeschlagenen Lösung wird das Festsetzen des Bandes im Eingießbereich sowie Verpuffungen beim Austreten des Bandendes aus der Kokille vermieden.The new method enables regulation and automation of the process for ending the casting, which relieves the operating personnel, avoids operating errors and improves overall operational safety.The method takes into account in particular the fact that within the metal sump a heterogeneous zone of the Crystal growth forms. Different growth of the crystals of opposing walls can lead to the formation of bridges in the pouring area, which oppose a reduction in the strip thickness and hinder the strip outfeed. In the proposed solution, the band is prevented from becoming stuck in the pouring area and deflagrations when the band end emerges from the mold.

Beim Gießen von 50 mm dicken Stahlbändern beträgt die Mindestabzugsgeschwindigkeit vBm 1,5 m/min.When casting 50 mm thick steel strips, the minimum take-off speed v Bm is 1.5 m / min.

Die jeweilige Höhenlage des Gießspiegels wird vorteilhaft durch Temperaturmessung innerhalb der Kokillenwände ermittelt.The respective height of the mold level is advantageously determined by measuring the temperature within the mold walls.

Die Höhenlage 'des Gießsumpfendes wird durch kontinuierliche Kraftmessung an der Breitseitenoberfläche des Bandes unmittelbar unterhalb der Kokille ermittelt. Die Höhenlage des Gießsumpfendes kann alternativ durch kontinuierliche Ultraschallmessung in Banddickenrichtung unmittelbar unterhalb der Kokille ermittelt werden.The altitude 'of Gießsumpfendes is determined by continuous force measurement at the wide side surface of the strip immediately underneath the chill mold. The height position of the G ießsumpfendes may alternatively be determined by continuous ultrasonic measurement in strip thickness direction immediately below the mold.

In einem Regelsystem für das erfindungsgemäße Verfahren werden Meßdaten der Gießspiegel- und.Gießsumpfendenlokalisierung fortlaufend einem Prozeßrechner zugeleitet und nach Sollwert-Istwertvergleich die Bandabzugsgeschwindigkeit vB und die entsprechende Eingießgeschwindigkeit vE geregelt.In a control system for the inventive process measurement data are continuously fed to the Gießspiegel- und.Gießsumpfendenlokalisierung a process computer and after setpoint and actual values, the tape pull g eschwindigkeit v B and the corresponding E v Eingießgeschwindigkeit regulated.

Eine Stahlbandgießanlage zur Durchführung des Verfahrens weist im Eingießbereich und im Parallelbereich der Breitseitenwände der Kokille mehrere Thermosensoren auf. Zur Gießsumpfendenermittlung sind der Kokille unmittelbar nachgeordnete Strangführungselemente mit Kraftsensoren versehen.A steel strip caster for performing the method has several thermal sensors in the pouring area and in the parallel area of the broad side walls of the mold. In order to determine the end of the casting sump, strand guide elements immediately downstream of the mold are provided with force sensors.

Die Erfindung wird anhand der Zeichnug näher erläutert. Es zeigen:

  • Fig. 1 schematisch eine Stahlbandgießanlage mit einem Querschnitt der Kokille,
  • Fig. 2 einen Längsschnitt der Kokille,
  • Fig. 3 die Beendigung des Gießvorganges in vier Phasen und
  • Fig. 4 je ein Diagramm für die Eingießgeschwindigkeit und die synchrone Bandabzugsgeschwindigkeit.
The invention is explained in more detail with reference to the drawing. Show it:
  • 1 schematically shows a steel strip caster with a cross section of the mold,
  • 2 shows a longitudinal section of the mold,
  • Fig. 3 shows the completion of the casting process in four phases and
  • Fig. 4 each a diagram for the casting speed and the synchronous tape take-off speed.

In einer Stahlbandgießanlage gemäß Fig. 1 und 2 fließt Stahlschmelze 1 aus einem Gießbehälter 2 von einem höhenverstellbaren Stopfen 3 geregelt durch ein Gießrohr 4 in eine Kokille 5, die von zwei gegenüberliegenden Breitseitenwänden-6 und zwei Schmalseitenwänden 7 gebildet wird. Breitseitenwände 6 und Schmalseitenwände 7 sind mit Kühlkanälen 8 versehen. Eine Oszillationsvorrichtung für die Kokille ist durch Pfeile 9 angedeutet. Die Breitseitenwände 6 bilden oberhalb eines formatbestimmenden Parallelabschnittes 10 einen sich nach oben erweiternden Eingießbereich 11 zur Aufnahme des Gießrohres 4.1 and 2, molten steel 1 flows from a casting tank 2 from a height-adjustable stopper 3, regulated by a pouring tube 4, into a mold 5 which is formed by two opposite broad side walls 6 and two narrow side walls 7. Broad side walls 6 and narrow side walls 7 are provided with cooling channels 8. An oscillation device for the mold is indicated by arrows 9. The broad side walls 6 form, above a format-determining parallel section 10, a pouring region 11 which widens upwards to accommodate the pouring tube 4.

Die bei Gießbeginn zuerst in die Kokille 5 einströmende Stahlschmelze 1 verbindet sich mit einem Anfahrkopf 12 der an einem Anfahrstrang 13 befestigt ist. Der sich bildende Gießspiegel 14 steigt über die seitlichen Ausflußöffnungen 15'des Gießrohres 4 an. Zur Ermittlung der momentanen Höhe des Gießspiegels 14 sind in den Breitseitenwänden Thermosensoren 16 vorgesehen. Der Anfahrstrang 13 befindet sich bei Gießbeginn in einer der Kokille nachgeordneten aus Rollen 17 bestehenden Strangführung. Am Ende der Strangführung ist ein Treiber 18 zur Ausförderung zunächst des Anfahrstranges 13 und anschließend des gegossenen Stahlbandes 25 angeordnet. Unmittelbar unterhalb der Kokille 5 ist eine Messeinrichtung 19 zur Ermittlung der vom ferrostatischen Druck auf die Bandschale 22 wirkenden Kraft angeordnet, Hierzu können Kraftsensoren 19 verwendet werden. Die Meßdaten der Thermosensoren 16 und Kraftsensoren 19 werden einem Prozeßrechner 20 zugeleitet, der nach Sollwert-Istwertvergleich die erforderliche Bandabzugsgeschwindigkeit vB für die Treiber 18 und die entsprechende Eingießgeschwindigkeit vE für das Stellgerät 21 des Stopfens 3 bestimmt.The molten steel 1 flowing into the mold 5 at the start of casting connects to a start-up head 12 which is fastened to a start-up line 13. The pouring level 14 that forms rises above the lateral outflow openings 15 ′ of the pouring tube 4. Thermosensors 16 are provided in the broad side walls to determine the current height of the casting level 14. At the start of casting, the starting strand 13 is located in a strand guide consisting of rollers 17 and arranged downstream of the mold. At the end of the strand guide, a driver 18 for conveying the start strand 13 and then the cast steel strip 25 is arranged. A measuring device 19 for determining the force acting on the band shell 22 from the ferrostatic pressure is arranged directly below the mold 5. Force sensors 19 can be used for this purpose. The measurement data of the thermal sensors 16 and force sensors 19 are fed to a process computer 20 which, after comparison of the target value and actual value, determines the required strip take-off speed v B for the drivers 18 and the corresponding pouring speed v E for the actuator 21 of the stopper 3.

Wie aus Fig. 3 zu ersehen, erstarrt der flüssige Stahl an den gekühlten Breitseitenwänden 6 und Schmalseitenwänden 7 der Kokille 5 zu Bandschalen 22,deren Dicke nach unten zunimmt. Die im Bereich des erweiterten Eingie Bbereichs 11 an den Breitseitenwänden 6 sich bildenden Bandschalen 22 werden im Verlauf der Absenkbewegung zum formatbestimmenden Parallelabschnitt 10 einander genähert.As can be seen from FIG. 3, the liquid steel solidifies on the cooled broad side walls 6 and narrow side walls 7 of the mold 5 to form band shells 22, the thickness of which increases downwards. The belt shells 22 which form on the broad side walls 6 in the area of the extended entry area 11 are brought closer to one another in the course of the lowering movement to the format-determining parallel section 10.

Die erfindungsgemäße Beendigung des Gießbetriebes ist in Fig. 3 in den Phasen A - C, C - D, E - F und F - G und in Fig. 4 in Diagrammen für die Eingießgeschwindigkeit vE und die Bandabzugsgeschwindigkeit vB synchron dargestellt.The termination of the casting operation according to the invention is shown in Fig. 3 in phases A-C, C-D, E-F and F-G and in Fig. 4 in diagrams for the casting speed v E and the strip take-off speed v B synchronously.

Während des normalen Gießbetriebes sind vE und vB auf hohem Niveau im Sinne gleicher Eingieß- und Abzugsvolumen aufeinander abgestimmt.During normal casting operation, v E and v B are coordinated at a high level in terms of the same pouring and withdrawal volumes.

Zur Beendigung des Gießbetriebes werden von.A bis B Eingießgeschwindigkeit vE und Bandabzugsgeschwindigkeit vB gleichmäßig auf einen Wert vEm, vBm reduziert, bei dem das Gießsumpfende 23 außerhalb des Parallelabschnittes 10 bleibt. Zum Zeitpunkt C wird der Schmelzenzulauf abgeschaltet, worauf der Gießspiegel 14 absinkt. Sobald der Gießspiegel 14 den Eingießbereich verläßt (D), wird die Bandabzugsgeschwindigkeit auf einen Wert vBr reduziert, bei welchem der Gießspiegel innerhalb des Parallelabschnittes 10 eine oben abschließende Erstarrungsschale 24 bildet (E - F). Nachdem das gegossene Band 25 die Kokille 5 verlassen hat, wird die Bandabzugsgeschwindigkeit vB zum schnellen Ausfördern des Bandes 25 wieder erhöht (G).At the end of the casting operation, the pouring speed v E and the strip take-off speed v B are uniformly reduced from.A to B to a value v Em , v Bm at which the casting sump end 23 remains outside the parallel section 10. At time C, the melt feed is switched off, whereupon the casting level 14 sinks. As soon as the casting level 14 leaves the pouring area (D), the strip take-off speed is reduced to a value v Br , at which the casting level forms a solidification shell 24 (E-F) within the parallel section 10. After the cast strip 25 has left the mold 5, the strip withdrawal speed v B is increased again for the rapid discharge of the strip 25 (G).

Claims (8)

1. Verfahren zur Beendigung des Gießbetriebes einer Stahlbandgießanlage mit einer Kokille mit gekühlten Schmalseitenwänden und Breitseitenwänden, die zur Aufnahme eines Gießrohres oberhalb eines formatbestimmenden Parallelabschnittes im Bereich der Breitseitenwände einen nach oben erweiterten Eingießbereich aufweist, dadurch gekennzeichnet, daß die Bandabzugsgeschwindigkeit vB und die Eingießgeschwindigkeit vE bis auf einen Wert vBm , VEm reduziert wfrd en bei welchem das Gießsumpfende (23) unmittelbar unterhalb des formatbestimmenden Parallelabschnittes (10) bleibt und daß nach der Abschaltung der Stahlzufuhr und dem Austreten des wegverfolgten Gießspiegels (14) aus dem Eingießbereich (11) die Bandabzugsgeschwindigkeit vB auf einen Wert vBr reduziert wird, bei welchem der Gießspiegel (14) innerhalb des formatbestimmenden Parallelabschnittes (10) eine abschließende Erstarrungsschale (24) bildet.1. A method for ending the casting operation of a steel strip caster with a mold with cooled narrow side walls and wide side walls, which has an upwardly enlarged pouring area for receiving a pouring tube above a format-defining parallel section in the area of the wide side walls, characterized in that the strip take-off speed v B and the pouring speed v E is reduced to a value v Bm , V Em at which the pouring sump end (23) remains directly below the format-determining parallel section (10) and that after the steel supply has been switched off and the tracked pouring level (14) has left the pouring area (11 ) the tape take-off speed v B is reduced to a value v Br at which the casting level (14) forms a final solidification shell (24) within the format-determining parallel section (10). 2. Verfahren nach,Anspruch 1, dadurch gekennzeichnet, daß beim Gießen von 50 mm dicken Stahlbändern die Mindestbandabzugsgeschwindigkeit VBm1,5 m/min beträgt.2. The method according to, claim 1, characterized in that when casting 50 mm thick steel strips, the minimum strip withdrawal speed V Bm is 1.5 m / min. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die jeweilige Höhenlage des Gießspiegels (14) durch Temperaturmessung innerhalb der Kokillenwände (6) ermittelt wird.3. The method according to claim 1, characterized in that the respective height of the casting level (14) is determined by temperature measurement within the mold walls (6). 4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Höhenlage des Gießsumpfendes (23) durch kontinuierliche Kraftmessung an der Breitseitenoberfläche des Bandes (25) unmittelbar unterhalb der Kokille (5) ermittelt wird.4. The method according to claim 1, characterized in that the height of the casting sump end (23) is determined by continuous force measurement on the broad side surface of the belt (25) immediately below the mold (5). 5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Höhenlage des Gießsumpfendes (23) durch kontinuierliche Ultraschallmessung in Banddickenrichtung unmittelbar unterhalb der'Kokille (5) ermittelt wird.5. The method according to claim 1, characterized in that the height of the casting sump end (23) is determined by continuous ultrasound measurement in the strip thickness direction immediately below the ' mold (5). 6. Regelsystem nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß Meßdaten der Gießspiegel- und Giesssumpfendenlokalisierung fortlaufend einem Prozeßrechner (20) zugeleitet werden und nach Sollwert-Istwertvergleich die Bandabzugsgeschwindigkeit vB und die entsprechende Eingießgeschwindigkeit vE geregelt werden.6. Control system according to one or more of claims 1 to 5, characterized in that measurement data of the mold level and pour sump end localization are continuously fed to a process computer (20) and the strip take-off speed v B and the corresponding pouring speed v E are regulated after comparison of the setpoint and actual value. 7. Stahlbandgießanlage zur Durchführung des Verfahrens nach einem oder mehreren der Ansprüche 1 bis 3, gekennzeichnet . durch mehrere im Eingießbereich (11) und im Parallelabschnitt (10) der Breitseitenwände (6) angeordnete Thermosensoren (16).7. Steel strip caster for carrying out the method according to one or more of claims 1 to 3, characterized. by means of several thermal sensors (16) arranged in the pouring area (11) and in the parallel section (10) of the broad side walls (6). 8. Stahlbandgießanlage zur Durchführung des Verfahrens nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Kokille (5) unmittelbar nachgeordnete Strangführungselemente mit Kraftsensoren (19) versehen sind.8. Steel strip caster for performing the method according to one or more of claims 1 to 5, characterized in that the mold (5) immediately downstream strand guide elements are provided with force sensors (19).
EP87102281A 1986-02-27 1987-02-18 Method of terminating the casting operation in a steel strip casting plant Expired - Lifetime EP0234491B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87102281T ATE56898T1 (en) 1986-02-27 1987-02-18 METHOD OF TERMINATING THE CASTING OPERATION OF A STEEL STRIP CASTING PLANT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3606289 1986-02-27
DE19863606289 DE3606289A1 (en) 1986-02-27 1986-02-27 METHOD FOR STOPPING THE CASTING OPERATION OF A STEEL TAPE CASTING SYSTEM

Publications (3)

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EP0234491A2 true EP0234491A2 (en) 1987-09-02
EP0234491A3 EP0234491A3 (en) 1988-01-07
EP0234491B1 EP0234491B1 (en) 1990-09-26

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EP87102281A Expired - Lifetime EP0234491B1 (en) 1986-02-27 1987-02-18 Method of terminating the casting operation in a steel strip casting plant

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US (1) US4729420A (en)
EP (1) EP0234491B1 (en)
JP (1) JPS62203652A (en)
KR (1) KR960002406B1 (en)
AT (1) ATE56898T1 (en)
CA (1) CA1288927C (en)
DE (2) DE3606289A1 (en)
ES (1) ES2017650B3 (en)
IN (1) IN169181B (en)

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AT512214A1 (en) * 2011-12-05 2013-06-15 Siemens Vai Metals Tech Gmbh PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE CASTING STAGE, AT THE CASTING END AND AT THE PRODUCTION OF A TRANSITION PIECE

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KR950014347B1 (en) * 1986-02-27 1995-11-25 에스 엠 에스 슐레만-지이마크 악티엔게젤샤프트 Method and apparatus for continuously casting strip
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JP2903844B2 (en) * 1992-03-25 1999-06-14 住友金属工業株式会社 Method of finishing casting in continuous casting
KR101896203B1 (en) * 2014-10-15 2018-09-07 신닛테츠스미킨 카부시키카이샤 Device, method, and computer readable storage medium for detecting molten-metal surface level in continuous casting mold

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT512214A1 (en) * 2011-12-05 2013-06-15 Siemens Vai Metals Tech Gmbh PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE CASTING STAGE, AT THE CASTING END AND AT THE PRODUCTION OF A TRANSITION PIECE
AT512214B1 (en) * 2011-12-05 2015-04-15 Siemens Vai Metals Tech Gmbh PROCESS ENGINEERING MEASURES IN A CONTINUOUS CASTING MACHINE AT THE CASTING STAGE, AT THE CASTING END AND AT THE PRODUCTION OF A TRANSITION PIECE
US9254520B2 (en) 2011-12-05 2016-02-09 Siemens Vai Metals Technologies Gmbh Process engineering measures in a continuous casting machine at the start of casting, at the end of casting and when producing a transitional piece

Also Published As

Publication number Publication date
IN169181B (en) 1991-09-14
CA1288927C (en) 1991-09-17
EP0234491A3 (en) 1988-01-07
ATE56898T1 (en) 1990-10-15
DE3765132D1 (en) 1990-10-31
DE3606289A1 (en) 1987-09-03
JPS62203652A (en) 1987-09-08
US4729420A (en) 1988-03-08
KR870007740A (en) 1987-09-21
KR960002406B1 (en) 1996-02-17
ES2017650B3 (en) 1991-03-01
EP0234491B1 (en) 1990-09-26

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