EP0234491B1 - 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
EP0234491B1
EP0234491B1 EP87102281A EP87102281A EP0234491B1 EP 0234491 B1 EP0234491 B1 EP 0234491B1 EP 87102281 A EP87102281 A EP 87102281A EP 87102281 A EP87102281 A EP 87102281A EP 0234491 B1 EP0234491 B1 EP 0234491B1
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EP
European Patent Office
Prior art keywords
casting
pouring
strip
mold
rate
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Expired - Lifetime
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EP87102281A
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German (de)
French (fr)
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EP0234491A2 (en
EP0234491A3 (en
Inventor
Günter Dr. Flemming
Manfred Kolakowski
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SMS Siemag AG
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SMS Schloemann Siemag AG
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Priority to AT87102281T priority Critical patent/ATE56898T1/en
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Publication of EP0234491A3 publication Critical patent/EP0234491A3/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 method for ending the casting operation of a steel strip caster with a mold with cooled narrow side walls and broad side walls, which has a pouring area which is expanded upwards in the area of the wide gaps to accommodate a pouring tube above a format-determining parallel section, and a steel strip caster for carrying out the method.
  • a further complicating factor at the end of the casting operation of a steel strip caster is that, due to the poor accessibility of the narrow mold opening, the heat-insulating slag cannot be removed, which leads to contamination of strand guiding elements when the mold exits the mold and to deflagration under the influence of sprayed cooling water.
  • the object of the invention is to provide a suitable, reliable method for ending the casting operation for steel strip casting plants, wherein the cast strip gets stuck in the pouring area or a shell breakthrough and deflagrations on the end face of the strip and slag contamination are avoided when leaving the mold.
  • the object is achieved in a method or a steel strip casting system of the type mentioned by the characterizing features of claim 1 or claim 7.
  • the new method enables regulation and automation of the process for ending the casting, thereby relieving the operating personnel, avoiding operating errors and improving overall operational safety.
  • the method takes into account in particular the fact that a heterogeneous zone of crystal growth forms within the metal sump starting from the strand shell. 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 height of the end of the casting sump is determined by continuous force measurement on the broad side surface of the strip immediately below the mold.
  • the height of the end of the casting sump can alternatively be determined by continuous ultrasound measurement in the strip thickness direction immediately below the mold.
  • measurement data of the localization of the mold level and the bottom of the pouring sump are continuously fed to a process computer and, after comparison of the setpoint and actual value, the strip take-off speed VB and the corresponding pouring speed Ve are regulated.
  • 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 guiding 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 starting head 12 which is fastened to a starting strand 13.
  • the resulting mold level 14 rises via 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 start-up strand 13 is located at the start of casting in a strand guide consisting of rollers 17 and arranged downstream of the mold.
  • a driver 18 for conveying the starting strand 13 and then the cast steel strip 25 is arranged.
  • a measuring device 19 for determining the force acting on the belt shell 22 from the ferrostatic pressure is arranged directly below the mold 5. Force sensors 19 can be used for this.
  • 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 band shells 22 which form in the region of the enlarged pouring area 11 on the broad side walls 6 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 the phases AC, CD, EF and FG 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 VE and strip take-off speed v are reduced uniformly from A to B to the values v Em , VBm at which the bottom of the pouring sump 23 remains below the parallel section 10.
  • the melt feed is switched off at time C, whereupon the pouring level 14 drops
  • the strip take-off speed is reduced to a value v Br at which a solidification shell 24 forms at the top of the casting level within the parallel section 10 (EF).
  • the tape take-off speed v B is increased again for the rapid removal of the tape 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

A method for concluding the operation of the continuous casting of strip metal comprising the steps of casting said strip in a narrow slotted strip shaped continuous casting mold having a flared inlet pouring zone necking down to a distal zone in which the walls of the mold are parallel and spaced apart by substantially the desired cross-sectional shape and dimensions of the strip being cast, pouring liquid metal through a pouring tube having an orifice into said flared zone, and controlling the pouring rate thereof, continuously detecting and monitoring the instantaneous surface level of the metal bath in said mold, withdrawing the casting from the distal end of said mold, and controlling the rate of withdrawal, adjusting the pouring rate and withdrawal rate so that the level of the metal bath is at a maximum height for said mold when in normal operation, continuously sensing whether or not there is present downstream of said mold evidence of the liquid core of said cast strip, reducing the pouring and withdrawal rates for concluding the casting to a rate at which the liquid core of the cast strip is near to but downstream of the mold and at which the metal bath level remains constant, terminating said pouring while continuing said withdrawal, whereby the metal bath level descends rapidly toward the neck end of said flared zone, reducing the withdrawal rate when the metal bath level is close to the lower end of the flared zone to a rate at which the upper surface of the metal bath can congeal sufficiently for further processing downstream by the time it reaches the end of the distal zone, and thereafter withdrawing the casting.

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 Parallelabschnittes im Bereich der Breitseinwände einen nach oben erweiterten Eingießbereich aufweist sowie eine Stahlbandgießanlage zur Durchführung des Verfahrens.The invention relates to a method for ending the casting operation of a steel strip caster with a mold with cooled narrow side walls and broad side walls, which has a pouring area which is expanded upwards in the area of the wide gaps to accommodate a pouring tube above a format-determining parallel section, and a steel strip caster for carrying out the method.

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

Bei bekannten Strahlstranggeißanlagen werden zur Beendigung des Gießbetriebes des 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 continuous strand casting machines, 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 mirror 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 breakdown 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 wärmisolierende 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.A further complicating factor at the end of the casting operation of a steel strip caster is that, due to the poor accessibility of the narrow mold opening, the heat-insulating slag cannot be removed, which leads to contamination of strand guiding elements when the mold exits the mold and to deflagration under the influence of sprayed cooling water.

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 Schlakkenverunreinigungen vermieden werden.The object of the invention is to provide a suitable, reliable method for ending the casting operation for steel strip casting plants, wherein the cast strip gets stuck in the pouring area or a shell breakthrough and deflagrations on the end face of the strip and slag contamination are avoided when leaving the mold.

Die gestellte Aufgabe wird bei einem Verfahren bzw. einer Stahlbandgießanlage der eingangs genannten Art durch die kennzeichnenden Merkmale des Anspruchs 1 bzw. des Anspruchs 7 gelost.The object is achieved in a method or a steel strip casting system of the type mentioned by the characterizing features of claim 1 or claim 7.

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 werden. 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, thereby relieving the operating personnel, avoiding operating errors and improving overall operational safety. The method takes into account in particular the fact that a heterogeneous zone of crystal growth forms within the metal sump starting from the strand shell. 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 height of the end of the casting sump is determined by continuous force measurement on the broad side surface of the strip immediately below the mold. The height of the end of the casting sump can alternatively be determined by continuous ultrasound measurement in the 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 method according to the invention, measurement data of the localization of the mold level and the bottom of the pouring sump are continuously fed to a process computer and, after comparison of the setpoint and actual value, the strip take-off speed VB and the corresponding pouring speed Ve are 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 guiding elements immediately downstream of the mold are provided with force sensors.

Die Erfindung wird anhand der Zeichnung 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 angeduetet. 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 Gießrohes 4 an. Zur Ermittlung der momentanen Höhe des Gießspiegels 14 sind in den Breitseitenwänden Thermosensoren 16 vorgesehen. Der Anfahrstrang 13 befindet sind 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.The molten steel 1 flowing into the mold 5 at the start of casting connects to a starting head 12 which is fastened to a starting strand 13. The resulting mold level 14 rises via 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 start-up strand 13 is located at the start of casting 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 starting strand 13 and then the cast steel strip 25 is arranged. A measuring device 19 for determining the force acting on the belt shell 22 from the ferrostatic pressure is arranged directly below the mold 5. Force sensors 19 can be used for this.

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 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 Eingießbereichs 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 band shells 22 which form in the region of the enlarged pouring area 11 on the broad side walls 6 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 the phases AC, CD, EF and FG 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 v" gleichmäßig bis auf die Werte vEm, VBm reduziert, bei welchen das Gießsumpfende 23 unterhalb 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 sich am 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 VE and strip take-off speed v "are reduced uniformly from A to B to the values v Em , VBm at which the bottom of the pouring sump 23 remains below the parallel section 10. The melt feed is switched off at time C, whereupon the pouring level 14 drops 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 a solidification shell 24 forms at the top of the casting level within the parallel section 10 (EF). After the cast strip 25 leaves the mold 5 has, the tape take-off speed v B is increased again for the rapid removal of the tape 25 (G).

Claims (8)

1. Method for terminating the casting operation of a steel strip casting plant with a chill mould (5) with cooled narrow side walls (7) and wide side walls (6), which for the reception of a casting tube (4) displays an upwardly enlarged pouring-in region (11) in the region of the wide side walls (6) above a format-determining parallel portion (10), characterised thereby, that the strip take-off speed vB and the pouring-in speed ve are reduced to the values vBm and vEm, at which the casting sump end (23) remains immediately underneath the format-determining parallel portion (10) and that the strip take-off speed vB is reduced after the switching-off of the steel feed and the issue of the travel-tracked casting surface level (14) out of the pouring-in region (11) to a value vBr, at which a sealing solidification shell (24) forms at the casting surface level (14) within the format-determining parallel portion (10).
2. Method according to Claim 1, characterised thereby, that the minimum strip take-off speed vBm amounts to 1.5 metres per minute for the casting of steel strip having a thickness of 50 millimetres.
3. Method according to Claim 1, characterised thereby, that the respective height position of the casting surface level (14) is determined by temperature measurement within the chill mould walls (6).
4. Method according to Claim 1, characterised thereby, that the height position of the casting sump end (23) is determined by continuous force measurement at the wide side surface of the strip (25) immediately underneath the chill mould (5).
5. Method according to Claim 1, characterised thereby, that the height position of the casting sump end (23) is determined by continuous ultrasonic measurement in strip thickness direction immediately underneath the chill mould (5).
6. Method according to one or more of the Claims 1 to 5, characterised thereby, that the measurement data of the location of casting surface level and casting sump end are fed continuously to a process computer (20) and the strip take-off speed vB and the corresponding pouring-in speed vE are regulated according to a comparison of target value and actual value.
7. Steel strip casting plant with a chill mould (5) with cooled narrow side walls (7) and wide side walls (6), which for the reception of a casting tube (4) displays an upwardly enlarged pouring-in region (11) in the region of the wide side walls (6) above a format-determining parallel portion (10) and with a regulating equipment for a driver (18) and a setting device (21) for the pouring-in cross- section, for the performance of the method according to one or more of the Claims 1 to 6, characterised thereby, that thermal sensors (16) are arranged in a wide side wall (6) in a row extending from the pouring-in region (11) into the parallel portion (10), a measuring device (19) for the determination of the height position of the casting sump end (23) is arranged immediately downstream of the chill mould (5) and the thermal sensors and the measuring device are connected by way of signal lines with a process computer (20).
8. Steel strip casting plant according to Claim 7, characterised thereby, that the measuring device (19) is formed of at least one force sensor.
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
DE19863606289 DE3606289A1 (en) 1986-02-27 1986-02-27 METHOD FOR STOPPING THE CASTING OPERATION OF A STEEL TAPE CASTING SYSTEM
DE3606289 1986-02-27

Publications (3)

Publication Number Publication Date
EP0234491A2 EP0234491A2 (en) 1987-09-02
EP0234491A3 EP0234491A3 (en) 1988-01-07
EP0234491B1 true 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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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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KR950014347B1 (en) * 1986-02-27 1995-11-25 에스 엠 에스 슐레만-지이마크 악티엔게젤샤프트 Method and apparatus for continuously casting strip
DE3801932A1 (en) * 1988-01-23 1989-08-03 Schloemann Siemag Ag METHOD FOR CASTING A STEEL STRIP IN A STEEL STRIP CASTING SYSTEM
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
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
JP6354850B2 (en) * 2014-10-15 2018-07-11 新日鐵住金株式会社 Apparatus, method and program for detecting level of molten metal in continuous casting mold

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE887990C (en) * 1951-05-07 1953-08-27 Irving Rossi Water-cooled continuous casting mold
BE624436A (en) * 1961-11-03
US3204460A (en) * 1962-08-13 1965-09-07 United States Steel Corp System for indicating the liquid level in a continuous-casting mold or the like
DE2440273C2 (en) * 1974-08-20 1976-09-30 Mannesmann Ag PROCEDURE FOR CONTROLLING THE CONTINUOUS CASTING PROCESS DURING STEEL PASTING, AND ARRANGEMENT FOR PERFORMING THE PROCESS
JPS5477229A (en) * 1977-11-22 1979-06-20 Ishikawajima Harima Heavy Ind Method and apparatus for controlling drawing speed and mold level in continuous casting machine
JPS56151147A (en) * 1980-04-24 1981-11-24 Nippon Steel Corp Method for detecting leading end position of unsolidified part of continuously cast ingot
AT378707B (en) * 1983-01-11 1985-09-25 Voest Alpine Ag METHOD FOR MONITORING A CONTINUOUS CASTING PLANT
CH659783A5 (en) * 1983-03-29 1987-02-27 Metacon Ag METHOD AND DEVICE FOR CONTROLLING A CONTINUOUS CASTING SYSTEM.
DE3400220A1 (en) * 1984-01-05 1985-07-18 SMS Schloemann-Siemag AG, 4000 Düsseldorf CHOCOLATE FOR CONTINUOUSLY STEEL STRIP
DE3423475C2 (en) * 1984-06-26 1986-07-17 Mannesmann AG, 4000 Düsseldorf Method and device for the continuous casting of liquid metals, in particular of liquid steel

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Publication number Publication date
JPS62203652A (en) 1987-09-08
EP0234491A2 (en) 1987-09-02
EP0234491A3 (en) 1988-01-07
DE3606289A1 (en) 1987-09-03
KR870007740A (en) 1987-09-21
ES2017650B3 (en) 1991-03-01
US4729420A (en) 1988-03-08
KR960002406B1 (en) 1996-02-17
DE3765132D1 (en) 1990-10-31
IN169181B (en) 1991-09-14
CA1288927C (en) 1991-09-17
ATE56898T1 (en) 1990-10-15

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