WO1999044772A1 - Method and device for early detection of a rupture in a continuos casting plant - Google Patents

Method and device for early detection of a rupture in a continuos casting plant Download PDF

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Publication number
WO1999044772A1
WO1999044772A1 PCT/DE1999/000445 DE9900445W WO9944772A1 WO 1999044772 A1 WO1999044772 A1 WO 1999044772A1 DE 9900445 W DE9900445 W DE 9900445W WO 9944772 A1 WO9944772 A1 WO 9944772A1
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Prior art keywords
temperature
mold
measurement
early detection
breakthrough
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Application number
PCT/DE1999/000445
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German (de)
French (fr)
Inventor
Jürgen ADAMY
Martin KÖNEMUND
Uwe STÜRMER
Original Assignee
Siemens Aktiengesellschaft
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Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to EP99916748A priority Critical patent/EP1060046B1/en
Priority to AT99916748T priority patent/ATE219978T1/en
Priority to DE59901923T priority patent/DE59901923D1/en
Publication of WO1999044772A1 publication Critical patent/WO1999044772A1/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
    • B22D11/16—Controlling or regulating processes or operations

Definitions

  • the invention relates to a method and a device for early breakthrough detection in a continuous casting installation, in which liquid metal is poured into a mold and pulled out of the mold in the form of a strand, the temperature of the mold being measured.
  • Early breakthrough detection is to be understood as early detection of breakthroughs in the initially liquid core of the strand through the solidified shell of the strand.
  • Early detection of breakthrough in the sense of the invention is, however, basically also to be understood as the detection of defects in the strand which can lead to breakthroughs.
  • the object of the invention is to improve the known breakthrough early detection.
  • FIG. 1 shows a continuous casting plant
  • FIG. 2 shows a mold
  • FIG. 3 shows the arrangement of temperature sensors, shown on the basis of a "developed" mold
  • FIG. 4 shows a known visualization of measured temperature values
  • FIG. 5 shows the temperature over time and place.
  • FIG. 1 shows a continuous continuous casting plant. Shown are a ladle 4, a tundish 3, a mold 2 with temperature sensors 8 for temperature detection, a strand 1, guide rollers 5, a cutting device 6 and a slab 7. The arrangement of the temperature sensors 8 on the mold 2 is illustrated in FIG Temperature sensors 8 are connected via a data line 11 to an evaluation device 10 and a display 9 for displaying the temperature over time and place.
  • thermocouples As temperature sensors come e.g. advantageously thermocouples in question.
  • a bar display according to FIG. 4 is known for visualizing the temperature Xi.
  • the temperature is displayed at the current time for each tempera ⁇ tursensor a bar graph, so the actual measured values.
  • the basic idea of the visualization method proposed according to the invention lies in the simultaneous representation of location NT, temperature ⁇ ⁇ and time t, as is shown in FIG. 5 in an exemplary representation.
  • a visualization according to FIG. 5 is provided for each of the two temperature sensor rows from FIG. 3:
  • the temperatures are represented in a particularly advantageous manner by different colors. It is particularly advantageous not to allow continuous color differences, but rather to assign certain temperature ranges to a specific color. For reasons of representation in black and white, the colors in FIG. 5 are represented by different hatching. Elements of the same color represent areas of the same temperature. ⁇ 5 is a higher temperature than ⁇ _, ⁇ _ is a higher temperature than ⁇ 3 , ⁇ 3 is a higher temperature than ⁇ 2 and ⁇ 2 is a higher temperature than ⁇ ⁇ .
  • the connecting lines 12, 13, 14, 15, 16 between the same color 4 gene, adjacent areas, so-called isochromes correspond to lines of the same temperature, ie so-called isotherms. Vertical lines, ie vertical Isochro ⁇ men are to be interpreted as undisturbed steady-state operation of the continuous casting plant.
  • characteristic isochromes are formed which can be easily recognized by the operator of a continuous casting plant in this form of visualization.
  • the pattern of isochromes 12 and 16 indicated in FIG. 5 (top left) shows an area in which a defect has formed at an elevated temperature, as is characteristic of adhesives. The temperature is highest inside the time / place distribution and drops towards the edges.
  • a reversed temperature gradient in FIG. 5 shows a pattern of the isochromes 13, 14, 15 with a lower temperature on the inside, as occurs in the case of cracks.
  • FIG. 5 is shown in an embodiment of the invention on the display 9.
  • the invention is also particularly advantageous for automatically recognizing expected defects in the strand which can lead to a breakdown.
  • the representation according to FIG. 6 is not shown on a display, but rather is fed to an automatic pattern recognition which emits an alarm when a significant fault is identified.
  • the pattern recognition is implemented particularly advantageously on an evaluation device 10. It is also particularly advantageous to simultaneously use a pattern recognition on an evaluation device 10 and a graphical representation. 5 position, as exemplified in FIG 5, to be shown on a display 9.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
  • Investigating Or Analyzing Materials Using Thermal Means (AREA)

Abstract

The invention relates to a method for early detection of a rupture in a continuos casting plant, wherein a liquid metal in cast into a chill (2) and is withdrawn from the chill (2) in the form of a billet (1), whereby the temperature of the chill (2) is measured and said temperature is simultaneously displayed together with the point and the duration of measurement of said temperature.

Description

Beschreibungdescription
Verfahren und Einrichtung zur Durchbruchfrüherkennung in einer StranggußanlageMethod and device for early breakthrough detection in a continuous casting plant
Die Erfindung betrifft ein Verfahren bzw. eine Einrichtung zur Durchbruchfrüherkennung in einer Stranggußanlage, in der flüssiges Metall in eine Kokille gegossen und in Form eines Stranges aus der Kokille herausgezogen wird, wobei die Tempe- ratur der Kokille gemessen wird. Dabei ist unter Durchbruchfrüherkennung zu verstehen, daß frühzeitig erkannt wird, wenn es zu Durchbrüchen des zunächst flüssigen Kerns des Stranges durch die erstarrte Hülle des Stranges kommt. Unter Durchbruchfrüherkennung im Sinne der Erfindung ist jedoch auch grundsätzlich das Erkennen von Defekten im Strang, die zu Durchbrüchen führen können, zu verstehen.The invention relates to a method and a device for early breakthrough detection in a continuous casting installation, in which liquid metal is poured into a mold and pulled out of the mold in the form of a strand, the temperature of the mold being measured. Early breakthrough detection is to be understood as early detection of breakthroughs in the initially liquid core of the strand through the solidified shell of the strand. Early detection of breakthrough in the sense of the invention is, however, basically also to be understood as the detection of defects in the strand which can lead to breakthroughs.
Zur Durchbruchfrüherkennung ist es bekannt, die Temperatur der Kokille an verschiedenen Stellen an der Kokille zu messen und auf einem Display die Temperatur an den gemessenen Stellen auf einem Display darzustellen. Eine derartige Darstellung ist z.B. in FIG 4 gezeigt.For early detection of breakthrough, it is known to measure the temperature of the mold at various locations on the mold and to display the temperature at the measured locations on a display. Such a representation is e.g. shown in FIG.
Es ist Aufgabe der Erfindung, die bekannte Druchbruchfrüh- erkennung zu verbessern.The object of the invention is to improve the known breakthrough early detection.
Diese Aufgabe wird erfindungsgemäß durch ein Verfahren gemäß Anspruch 1 oder 2 bzw. eine Einrichtung gemäß Anspruch 3 oder 4 gelöst. Dabei wird zur Durchbruchfrüherkennung in einer Stranggußanlage, in der flüssiges Metall in eine Kokille gegossen und in Form eines Stranges aus der Kokille herausgezogen, die Temperatur der Kokille gemessen. Die gemessene Temperatur der Kokille wird dann gleichzeitig über den Ort der Messung der Temperatur und über die Zeit der Messung der Te - peratur dargestellt und/oder ausgewertet. Auf diese Weise können Durchbrüche oder Fehlstellen, die zu Durchbrüchen füh- 2 ren können, erheblich besser vorhergesagt werden als mit dem bekannten Verfahren.This object is achieved according to the invention by a method according to claim 1 or 2 or a device according to claim 3 or 4. For early breakdown detection, the temperature of the mold is measured in a continuous casting installation in which liquid metal is poured into a mold and pulled out of the mold in the form of a strand. The measured temperature of the mold is then displayed and / or evaluated simultaneously over the location of the temperature measurement and over the time of the temperature measurement. In this way, breakthroughs or defects that lead to breakthroughs 2 ren can be predicted much better than with the known method.
Vorteile und Einzelheiten ergeben sich aus der nachfolgenden Beschreibung, des Stands der Technik sowie einem Ausführungs¬ beispiel der Erfindung. Im einzelnen zeigen:Advantages and details will emerge from the following description of the prior art, and an execution ¬ example of the invention. In detail show:
FIG 1 eine Stranggußanlage, FIG 2 eine Kokille, FIG 3 die Anordnung von Temperatursensoren, dargestellt anhand einer "abgewickelten" Kokille, FIG 4 eine bekannte Visualisierung von Temperaturmeßwerten, FIG 5 eine Darstellung der Temperatur über Ort und Zeit.1 shows a continuous casting plant, FIG. 2 shows a mold, FIG. 3 shows the arrangement of temperature sensors, shown on the basis of a "developed" mold, FIG. 4 shows a known visualization of measured temperature values, FIG. 5 shows the temperature over time and place.
FIG 1 zeigt eine kontinuierliche Stranggußanlage. Dargestellt sind eine Gießpfanne 4, eine Verteilerrinne 3, eine Kokille 2 mit Temperatursensorenn 8 zur Temperaturerfassung, ein Strang 1, Führungsrollen 5, ein Schneide- gerät 6 und eine Bramme 7. Die Anordnung der Temperatursensoren 8 an der Kokille 2 verdeutlicht FIG 2. Die Temperatursensoren 8 sind über eine Datenleitung 11 mit einer Auswerteeinrichtung 10 und einem Display 9 zur Darstellung der Temperatur über Zeit und Ort verbunden.1 shows a continuous continuous casting plant. Shown are a ladle 4, a tundish 3, a mold 2 with temperature sensors 8 for temperature detection, a strand 1, guide rollers 5, a cutting device 6 and a slab 7. The arrangement of the temperature sensors 8 on the mold 2 is illustrated in FIG Temperature sensors 8 are connected via a data line 11 to an evaluation device 10 and a display 9 for displaying the temperature over time and place.
Als Temperatursensoren kommen z.B. vorteilhafterweise Thermoelemente in Frage.As temperature sensors come e.g. advantageously thermocouples in question.
Die Durchbruchfrüherkennung beim Stahl-Strangguß dient dazu, Fehlstellen in der Strangschale frühzeitig zu erkennen. Fehlstellen sind Kleber und Rißstellen und können zu einem Durchbruch der Strangschale führen, was mit hohem wirtschaftlichen Schaden und Produktionsausfall verbunden ist.The early detection of breakthroughs in continuous steel casting serves to identify defects in the strand shell at an early stage. Flaws are glue and tears and can lead to the strand shell breaking, which is associated with high economic damage and loss of production.
FIG 3 zeigt eine Kokille 2 in abgewickelter Darstellung. An der Kokille 2 sind in zwei Zeilen je ca. n = 20 Tempe- 3 ratursensoren angebracht. Die Erfindung wird auch ganz besonders vorteilhaft mit einer Zeile von Temperatursen¬ soren eingesetzt.3 shows a mold 2 in a developed representation. At mold 2, approx. N = 20 temperatures are 3 temperature sensors attached. The invention is also especially advantageously used with sensors of a line of Temperatursen ¬.
Zur Visualisierung der Temperatur Xi ist eine Balkenanzeige gemäß FIG 4 bekannt. Hierin wird für jeden Tempera¬ tursensor über eine Balkendarstellung die Temperatur zum aktuellen Zeitpunkt angezeigt, also die aktuellen Meßwerte.A bar display according to FIG. 4 is known for visualizing the temperature Xi. Here, the temperature is displayed at the current time for each tempera ¬ tursensor a bar graph, so the actual measured values.
Die grundlegende Idee des erfindungsgemäß vorgeschlagenen Visualisierungsverfahrens liegt in der gleichzeitigen Darstellung von Ort NT, Temperatur τ± und Zeit t, wie sie in FIG 5 in beispielhafter Darstellung ausgeführt ist. Für die beiden Temperatursensorreihen aus FIG 3 ist jeweils eine Visualisierung nach FIG 5 vorgesehen:The basic idea of the visualization method proposed according to the invention lies in the simultaneous representation of location NT, temperature τ ± and time t, as is shown in FIG. 5 in an exemplary representation. A visualization according to FIG. 5 is provided for each of the two temperature sensor rows from FIG. 3:
(i) Ort: Zeilenweise wird die örtliche Verteilung der Temperatursensoren wie bislang dargestellt. (ii) Temperatur: In jeder Zeile wird durch farbliche Unterscheidung die Temperatur Ti angegeben, (iii) Zeit: Zeilenweise werden die zeitlich nacheinander eingehenden Daten dargestellt, so daß die Zeit t durch Abstieg in den Zeilen repräsentiert wird.(i) Location: The local distribution of the temperature sensors is shown line by line as before. (ii) Temperature: In each line, the temperature Ti is indicated by a color distinction, (iii) time: The data arriving in time are displayed line by line, so that the time t is represented by a descent in the lines.
In besonders vorteilhafter Weise werden die Temperaturen durch unterschiedliche Farben dargestellt. Dabei ist es von besonderem Vorteil, keine kontinuierlichen Farbunterschiede zuzulassen, sondern jeweils bestimmten Tempera- turbereichen eine bestimmte Farbe zuzuordnen. Aus Gründen der Darstellung in Schwarzweiß sind die Farben in FIG 5 durch unterschiedliche Schraffierungen dargestellt. Gleichfarbige Elemente stellen Bereiche gleicher Temperatur dar. τ5 ist eine höhere Temperatur als τ_, τ_ ist eine höhere Temperatur als τ3, τ3 ist eine höhere Temperatur als τ2 und τ2 ist eine höhere Temperatur als τα . Die Verbindungslinien 12, 13, 14, 15, 16 zwischen gleichfarbi- 4 gen, nebeneinanderliegenden Bereichen, sog. Isochromen, entsprechen Linien gleicher Temperatur, d.h. sogenannte Isothermen. Senkrechte Linien, d.h. senkrechte Isochro¬ men, sind als ungestörter stationärer Betrieb der Strang- guß-Anlage zu interpretieren.The temperatures are represented in a particularly advantageous manner by different colors. It is particularly advantageous not to allow continuous color differences, but rather to assign certain temperature ranges to a specific color. For reasons of representation in black and white, the colors in FIG. 5 are represented by different hatching. Elements of the same color represent areas of the same temperature. Τ 5 is a higher temperature than τ_, τ_ is a higher temperature than τ 3 , τ 3 is a higher temperature than τ 2 and τ 2 is a higher temperature than τ α . The connecting lines 12, 13, 14, 15, 16 between the same color 4 gene, adjacent areas, so-called isochromes, correspond to lines of the same temperature, ie so-called isotherms. Vertical lines, ie vertical Isochro ¬ men are to be interpreted as undisturbed steady-state operation of the continuous casting plant.
Bei Auftreten der obengenannten Fehlstellen, bilden sich charakteristische Isochromen, die in dieser Form der Visualisierung für den Bediener einer Strangguß-Anlage ein- fach erkennbar sind. Das in FIG 5 (links oben) angedeutete Muster der Isochromen 12 und 16 zeigt einen Bereich, in dem sich um eine Fehlstelle mit erhöhter Temperatur ausgebildet hat, wie es bei Klebern charakteristisch ist. Die Temperatur ist im Inneren der Zeit-/ Ortsverteilung am höchsten und fällt zu den Rändern hin ab.When the above-mentioned defects occur, characteristic isochromes are formed which can be easily recognized by the operator of a continuous casting plant in this form of visualization. The pattern of isochromes 12 and 16 indicated in FIG. 5 (top left) shows an area in which a defect has formed at an elevated temperature, as is characteristic of adhesives. The temperature is highest inside the time / place distribution and drops towards the edges.
Nach dem gleichen Prinzip ist mit umgekehrtem Temperaturgradient in FIG 5 (Mitte) ein Muster der Isochromen 13, 14, 15 mit niedrigerer Temperatur im Inneren gezeigt, wie es bei Rißstellen auftritt.According to the same principle, a reversed temperature gradient in FIG. 5 (center) shows a pattern of the isochromes 13, 14, 15 with a lower temperature on the inside, as occurs in the case of cracks.
Die Darstellung gemäß FIG 5 wird in Ausgestaltung der Erfindung auf dem Display 9 dargestellt. Die Erfindung eig- net sich jedoch auch besonders vorteilhaft zum automatischen Erkennen von zu erwartenden Fehlstellen im Strang, die zu einem Durchbruch führen können. Dabei wird die Darstellung gemäß FIG 6 nicht auf einem Display dargestellt, sondern einer automatischen Mustererkennung zuge- führt, die bei Erkennen einer signifikanten Fehlstelle einen Alarm ausgibt.5 is shown in an embodiment of the invention on the display 9. However, the invention is also particularly advantageous for automatically recognizing expected defects in the strand which can lead to a breakdown. The representation according to FIG. 6 is not shown on a display, but rather is fed to an automatic pattern recognition which emits an alarm when a significant fault is identified.
Die Mustererkennung ist besonders vorteilhaft auf einer Auswerteeinrichtung 10 implementiert. Es ist ferner be- sonders vorteilhaft, gleichzeitig eine Mustererkennung auf einer Auswerteeinrichtung 10 und eine graphische Dar- 5 Stellung, wie sie beispielhaft in FIG 5 ausgeführt ist, auf einem Display 9 darzustellen. The pattern recognition is implemented particularly advantageously on an evaluation device 10. It is also particularly advantageous to simultaneously use a pattern recognition on an evaluation device 10 and a graphical representation. 5 position, as exemplified in FIG 5, to be shown on a display 9.

Claims

Patentansprüche claims
1. Verfahren zur Durchbruchfrüherkennung in einer Stranggußanlage, in der flüssiges Metall in eine Kokille (2) gegossen und in Form eines Stranges (1) aus der Kokille (2) herausgezogen wird, wobei die Temperatur der Kokille (2) gemessen wird, und wobei die Temperatur der Kokille (2) gleichzeitig über den Ort der Messung der Temperatur und über die Zeit der Messung der Temperatur dargestellt wird.1. A method for early detection of breakthrough in a continuous casting installation, in which liquid metal is poured into a mold (2) and pulled out in the form of a strand (1) from the mold (2), the temperature of the mold (2) being measured, and wherein the temperature of the mold (2) is displayed simultaneously over the location of the temperature measurement and over the time of the temperature measurement.
2. Verfahren zur Durchbruchfrüherkennung in einer Stranggußanlage, in der flüssiges Metall in eine Kokille (2) gegossen und in Form eines Stranges (1) aus der Kokille (2) herausgezogen wird, wobei die Temperatur der Kokille (2) gemessen wird, und wobei die Temperatur der Kokille (2) gleichzeitig über den Ort der Messung der Temperatur und über die Zeit der Messung der Temperatur ausgewertet wird.2. A method for early detection of breakthrough in a continuous casting installation, in which liquid metal is poured into a mold (2) and pulled out in the form of a strand (1) from the mold (2), the temperature of the mold (2) being measured, and wherein the temperature of the mold (2) is evaluated simultaneously via the location of the temperature measurement and the time of the temperature measurement.
3. Einrichtung zur Durchbruchfrüherkennung in einer Strang- gußanlage, in der flüssiges Metall in eine Kokille (2) gegossen und in Form eines Stranges (1) aus der Kokille (2) herausgezogen wird, wobei die Einrichtung zur Durchbruchfrüherkennung einen Temperatursensor (8) zur Messung der Temperatur der Kokille (2) und ein Display (9), zur gleich- zeitigen Darstellung der Temperatur der Kokille (2) über den Ort der Messung der Temperatur und über die Zeit der Messung der Temperatur aufweist.3. Device for early detection of breakthrough in a continuous casting installation, in which liquid metal is poured into a mold (2) and pulled out of the mold (2) in the form of a strand (1), the device for early detection of breakthrough using a temperature sensor (8) Measurement of the temperature of the mold (2) and a display (9) for the simultaneous display of the temperature of the mold (2) over the location of the measurement of the temperature and over the time of the measurement of the temperature.
4. Einrichtung zur Durchbruchfrüherkennung in einer Strang- gußanlage, in der flüssiges Metall in eine Kokille (2) gegossen und in Form eines Stranges (1) aus der Kokille (2) herausgezogen wird, wobei die Einrichtung zur Durchbruchfrüherkennung einen Temperatursensor (8) zur Messung der Temperatur der Kokille (2) und eine Mustererkennung, zur Ausertung der Temperatur der Kokille (2) über den Ort der Messung der Temperatur und über die Zeit der Messung der Temperatur aufweist. 4. Device for early detection of breakthrough in a continuous casting installation, in which liquid metal is poured into a mold (2) and pulled out of the mold (2) in the form of a strand (1), the device for early detection of breakthrough using a temperature sensor (8) Measurement of the temperature of the mold (2) and a pattern recognition, for evaluating the temperature of the mold (2) over the location of the measurement of the temperature and over the time of the measurement of the temperature.
PCT/DE1999/000445 1998-03-03 1999-02-18 Method and device for early detection of a rupture in a continuos casting plant WO1999044772A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99916748A EP1060046B1 (en) 1998-03-03 1999-02-18 Method and device for early detection of a rupture in a continuos casting plant
AT99916748T ATE219978T1 (en) 1998-03-03 1999-02-18 METHOD AND DEVICE FOR EARLY BREAKDOWN DETECTION IN A CONTINUOUS CASTING PLANT
DE59901923T DE59901923D1 (en) 1998-03-03 1999-02-18 METHOD AND DEVICE FOR BREAKTHROUGH DETECTION IN A CONTINUOUS CASTING SYSTEM

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19808998A DE19808998B4 (en) 1998-03-03 1998-03-03 Method and device for early breakthrough detection in a continuous casting plant
DE19808998.8 1998-03-03

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WO1999044772A1 true WO1999044772A1 (en) 1999-09-10

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EP (1) EP1060046B1 (en)
AT (1) ATE219978T1 (en)
DE (2) DE19808998B4 (en)
WO (1) WO1999044772A1 (en)

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DE10312923B8 (en) * 2003-03-22 2005-07-14 Sms Demag Ag Method for determining the measuring temperatures in continuous casting molds and continuous casting mold itself
CN100402190C (en) * 2005-11-03 2008-07-16 上海梅山钢铁股份有限公司 Method and equipment for monitoring and analyzing temperature of target on surface of continuous casting billet
DE102008029742A1 (en) * 2008-06-25 2009-12-31 Sms Siemag Aktiengesellschaft Mold for casting metal
DE102008060507A1 (en) 2008-07-10 2010-01-14 Sms Siemag Aktiengesellschaft Temperature measurement in a mold by a fiber optic measuring method

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ATE219978T1 (en) 2002-07-15
DE19808998A1 (en) 1999-09-09
EP1060046B1 (en) 2002-07-03
EP1060046A1 (en) 2000-12-20
DE59901923D1 (en) 2002-08-08
DE19808998B4 (en) 2007-12-06
US20030150584A1 (en) 2003-08-14

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