EP1491275A1 - Process and measuring device for detecting nucleate boiling in the cooling channels of a continuous casting mould - Google Patents
Process and measuring device for detecting nucleate boiling in the cooling channels of a continuous casting mould Download PDFInfo
- Publication number
- EP1491275A1 EP1491275A1 EP04012297A EP04012297A EP1491275A1 EP 1491275 A1 EP1491275 A1 EP 1491275A1 EP 04012297 A EP04012297 A EP 04012297A EP 04012297 A EP04012297 A EP 04012297A EP 1491275 A1 EP1491275 A1 EP 1491275A1
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- European Patent Office
- Prior art keywords
- mold
- cooling channels
- detecting
- cooling
- bubble boiling
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- 238000009835 boiling Methods 0.000 title claims abstract description 30
- 238000001816 cooling Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 6
- 238000009749 continuous casting Methods 0.000 title description 6
- 238000005266 casting Methods 0.000 claims abstract description 13
- 239000002826 coolant Substances 0.000 claims description 11
- 238000001514 detection method Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 239000000498 cooling water Substances 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Definitions
- the invention relates to a method and a measuring arrangement for detecting bubble boiling in the cooling channels of a continuous casting mold and means for suppressing them.
- the mold cooling is usually designed on the basis of experience, temperature measurements, literature information and / or numerical calculations.
- the copper temperatures that occur in particular at high casting speeds and decreasing copper wall thicknesses can lead to an uncontrolled bubble boiling on the water side in critical cases.
- the uncontrolled bubble boiling leads to uneven heat transfer in the mold and can cause strand defects.
- the known document proposes that the flow rate and the water pressure of the cooling system be set so that the lowest temperature in the region of the water outlet side is at the boiling point limit, and that for all higher temperatures, bubble evaporation during supercooled boiling of the Cooling water is excited.
- Document EP 0 881 018 B1 discloses a liquid-cooled continuous casting mold with mutually independent walls made of copper plates, the inlet of cooling water being arranged in the lower region and the cooling water outlet being arranged in the upper region of the wall, and cooling ducts with inlet and outlet bores in each case in a vertical plane are arranged.
- the inlet bores form the inlet of the cooling water flow into the cooling channels of the mold wall, while the sum of the drain bores together form the water drain and at least one temperature sensor and a sensor for the feed quantity per unit of time is arranged in the cooling water inlet, and temperature sensors are also connected at least at two points in the water drainage area between a copper plate and the cooling water drain openings of the water box per broadside plate.
- the signals of water temperatures and water quantities fed to a computer enable a differentiated statement about the distribution of partial heat flows along the mold width.
- Document DE 36 32 333 C2 discloses a device for monitoring vibrations of a continuous casting mold that can be driven in the casting direction with a vibration sensor that can be connected to an evaluation circuit in the form of an accelerometer that can be attached to the mold.
- the vibration sensor consists of a three-component accelerometer, which is connected via a double integrator to a measured value memory for the individual components that can be read out according to a freely selectable program.
- the invention has for its object to set up a continuous monitoring for supercooled bubble boiling in the cooling channels of a continuous casting mold in the ongoing casting operation, in order to avoid an uncontrolled bubble boiling, which is the cause of an uneven heat transfer from the cast metal into the mold walls is and can cause string faults.
- the stated object is achieved in that accelerometers are provided on the mold, preferably on at least one of the mold plates or in at least one of the coolant channels.
- An alternative of the measuring arrangement consists in that at least one measuring device for detecting the sound pulses emitted during subcooled bubble boiling in the cooling channels is arranged on or outside the mold, which is connected to a measuring device for detecting the background noise of the coolant flow in the cooling channels and both measuring devices Components of a control loop for changing the coolant parameters of the mold work together.
- this is achieved in that, for example, the speed and / or the pressure of the coolant in the cooling channels of the mold is increased in accordance with the determined control variable until the signal pattern of the background noise in the casting operation is reached again without undercooled bubble boiling.
- the possibility is created of avoiding the formation of temperature differences in the area of the bath level and thus of reducing the melting behavior of the casting powder and preventing strand defects.
- FIG. 1 shows a broad side wall 11 and a mold 10.
- a bore 12 on the side which receives a temperature sensor 13. This has the task of determining the current temperature of the broad side wall 11 and the mold 10 by measurement.
- FIG. 2 shows a measuring arrangement for detecting bubble boiling in the cooling channels of the mold 10 in a continuous casting plant, not shown.
- a transmitter 13 is connected to the control circuit 14 for detecting the sound pulses emitted in the cooling channels during supercooled bubble boiling.
- the control circuit 14 has, as components, the measuring units 1 and 2 or controllers, which interact with changes in the coolant parameters of the mold.
- the controller 1 receives a basic noise as the basic pattern of a sound emission in the mold in the casting operation without supercooled bubble boiling.
- the controller 1 receives the current values for water pressure, water speed and pouring speed and sound emission from the control circuit 14 and compares the latter with the basic pattern of the sound emission of the transmitter 13 and forms control variables from the comparison of the current parameter data with the aid of the comparison units 4, 5, 6 of the controller 2 for changing the cooling parameters of the mold 10.
- Set values for the controller 2 in the controller circuit are simultaneously applied to the comparison units 4, 5, 6.
- the current values for casting speed, water speed and water pressure are then changed until the corresponding background noise in the mold is reached again without supercooled bubble boiling.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren und eine Messanordnung zum Erkennen von Blasensieden in den Kühlkanälen einer Stranggießkokille und Mittel zu deren Unterdrückung.The invention relates to a method and a measuring arrangement for detecting bubble boiling in the cooling channels of a continuous casting mold and means for suppressing them.
Die Kokillenkühlung wird üblicherweise auf der Basis von Erfahrungen, Temperaturmessungen, Literaturangaben und/oder numerischen Berechnungen ausgelegt.The mold cooling is usually designed on the basis of experience, temperature measurements, literature information and / or numerical calculations.
Die insbesondere bei hohen Gießgeschwindigkeiten und abnehmenden Kupferwandstärken auftretenden Kupfertemperaturen können in kritischen Fällen zu einem unkontrollierten Blasensieden auf der Wasserseite führen. Das unkontrollierte Blasensieden führt zu einem ungleichmäßigen Wärmeübergang in der Kokille und kann Strangfehler verursachen.The copper temperatures that occur in particular at high casting speeds and decreasing copper wall thicknesses can lead to an uncontrolled bubble boiling on the water side in critical cases. The uncontrolled bubble boiling leads to uneven heat transfer in the mold and can cause strand defects.
Aus dem Dokument EP 0 992 304 A1 ist bekannt, dass bei Auslegung der Kokillenkühlung zumeist die Strömungsgeschwindigkeit und der Wasserdruck an der Austrittsseite des Kühlsystems so gewählt werden, dass für die heißeste Stelle der Kokille die Temperaturen an der Oberfläche der Kühlkanäle unter der Siedetemperatur des Wassers entsprechend dem Austrittsdruck liegen.From document EP 0 992 304 A1 it is known that when designing the mold cooling, the flow rate and the water pressure on the outlet side of the cooling system are usually selected such that the temperatures on the surface of the cooling channels below the boiling point of the water for the hottest point of the mold according to the outlet pressure.
Dabei können sich an der Kontaktfläche der Schmelze zur Kokillenplatte im Bereich des Badspiegels unterschiedliche Wärmebelastungen ergeben, die zu unterschiedlichem Aufschmelzverhalten des Giesspulvers führen und damit zu Ungleichmässigkeiten in der Ausbildung der noch sehr empfindlichen Strangschale in statu nascendi.Different heat loads can result at the contact surface of the melt with the mold plate in the area of the bath level, which lead to different melting behavior of the casting powder and thus to irregularities in the formation of the still very sensitive strand shell in statu nascendi.
Zur Verbesserung dieser nachteiligen Verhältnisse schlägt das bekannte Dokument vor, dass die Strömungsgeschwindigkeit und der Wasserdruck des Kühlsystems so eingestellt werden, dass die niedrigste Temperatur im Bereich der Wasseraustrittsseite an der Grenze der Siedetemperatur liegt, und dass für alle höheren Temperaturen eine Blasenverdampfung beim unterkühlten Sieden des Kühlwassers angeregt wird.In order to improve these disadvantageous relationships, the known document proposes that the flow rate and the water pressure of the cooling system be set so that the lowest temperature in the region of the water outlet side is at the boiling point limit, and that for all higher temperatures, bubble evaporation during supercooled boiling of the Cooling water is excited.
Dadurch wird erreicht, dass die Wärmestromdichte beim Wärmeübergang vom gegossenen Metallstrang über die Kokillenwand auf das Kühlmedium Wasser infolge des erhöhten Verbrauchs an Verdampfungswärme für die Blassenverdampfung mit steigender Überschreitung der Siedetemperatur durch entsprechende Intensivierung der Blasenverdampfung derart erhöht wird, dass sich die Temperaturunterschiede über die Kokillenbreite verringern, womit eine Egalisierung der Temperaturverteilung im Bereich des Badspiegels durch gezielte Kühlung der Kokillenwände und damit auch des Metallstranges mit Hilfe des unterkühlen Siedens des Kühlwassers erzielt wird.This ensures that the heat flow density during the heat transfer from the cast metal strand via the mold wall to the cooling medium water is increased due to the increased consumption of heat of vaporization for pale evaporation with increasing exceeding of the boiling temperature by appropriately intensifying the bubble evaporation in such a way that the temperature differences over the mold width decrease , with which an equalization of the temperature distribution in the area of the bath level is achieved by targeted cooling of the mold walls and thus also of the metal strand with the help of subcooled boiling of the cooling water.
Das Dokument EP 0 881 018 B1 offenbart eine flüssigkeitsgekühlte Stranggießkokille mit voneinander unabhängigen Wänden aus Kupferplatten, wobei im unteren Bereich der Zulauf von Kühlwasser und im oberen Wandbereich der Kühlwasserablauf angeordnet ist, und in dichter Folge jeweils in einer vertikalen Ebene Kühlkanäle mit Zu- und Ablaufbohrungen angeordnet sind. Die Zulaufbohrungen bilden den Zulauf des Kühlwasserstromes in die Kühlkanäle der Kokillenwand, während die Summe der Ablaufbohrungen zusammen den Wasserablauf bilden und im Kühlwasserzulauf wenigstens ein Temperaturfühler und ein Geber für die Zulaufmenge pro Zeiteinheit angeordnet ist und wobei ferner im Wasserablaufbereich zwischen einer Kupferplatte und den Kühlwasserablauföffnungen des Wasserkastens pro Breitseitenplatte mindestens an zwei Stellen Temperaturfühler angeschlossen sind. Die einem Rechner zugeführten Signale von Wassertemperaturen und Wassermengen ermöglichen eine differenzierte Aussage über die Verteilung partieller Wärmeströme entlang der Kokillenbreite.Document EP 0 881 018 B1 discloses a liquid-cooled continuous casting mold with mutually independent walls made of copper plates, the inlet of cooling water being arranged in the lower region and the cooling water outlet being arranged in the upper region of the wall, and cooling ducts with inlet and outlet bores in each case in a vertical plane are arranged. The inlet bores form the inlet of the cooling water flow into the cooling channels of the mold wall, while the sum of the drain bores together form the water drain and at least one temperature sensor and a sensor for the feed quantity per unit of time is arranged in the cooling water inlet, and temperature sensors are also connected at least at two points in the water drainage area between a copper plate and the cooling water drain openings of the water box per broadside plate. The signals of water temperatures and water quantities fed to a computer enable a differentiated statement about the distribution of partial heat flows along the mold width.
Das Dokument DE 36 32 333 C2 offenbart eine Vorrichtung zum Überwachen von Schwingungen einer in Giessrichtung schwingend antreibbaren Stranggießkokille mit einem an eine Auswertschaltung anschließbaren Schwingungsaufnehmer in Form eines an der Kokille befestigbaren Beschleunigungsgebers. Der Schwingungsaufnehmer besteht aus einem Dreikomponenten-Beschleunigungsgeber, der über einen Doppelintegrator an einen nach einem frei wählbaren Programm auslesbaren Messwertspeicher für die einzelnen Komponenten angeschlossen ist.Document DE 36 32 333 C2 discloses a device for monitoring vibrations of a continuous casting mold that can be driven in the casting direction with a vibration sensor that can be connected to an evaluation circuit in the form of an accelerometer that can be attached to the mold. The vibration sensor consists of a three-component accelerometer, which is connected via a double integrator to a measured value memory for the individual components that can be read out according to a freely selectable program.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, im laufenden Gießbetrieb eine kontinuierliche Überwachung auf unterkühltes Blasensieden in den Kühlkanälen einer Stranggießkokille einzurichten, um damit ein unkontrolliertes Blasensieden zu vermeiden, welches die Ursache für einen ungleichmäßigen Wärmeübergang vom gegossenen Metall in die Kokillenwände ist und Strangfehler hervorrufen kann.Starting from the aforementioned prior art, the invention has for its object to set up a continuous monitoring for supercooled bubble boiling in the cooling channels of a continuous casting mold in the ongoing casting operation, in order to avoid an uncontrolled bubble boiling, which is the cause of an uneven heat transfer from the cast metal into the mold walls is and can cause string faults.
Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 genannten Art mit der Erfindung vorgeschlagen, die beim Rekondensieren der Blasen entstehenden Druckwellen messtechnisch zu erfassen und mit dem Grundrauschen in der Kokille im Gießbetrieb ohne unterkühltes Blasensieden zu vergleichen und aus dem Vergleich beider Messgrößen eine Regelgröße zur Veränderung der Kühlparameter der Kokille zu ermitteln.To achieve the object, it is proposed in a method of the type mentioned in the preamble of claim 1 with the invention to measure the pressure waves arising during the recondensation of the bubbles and to compare them with the background noise in the mold in the casting operation without supercooled bubble boiling and by comparing the two Measured variables to determine a control variable for changing the cooling parameters of the mold.
Damit gelingt es, nahezu verzögerungslos auf ein erstes Auftreten des unterkühlten Blasensiedens zu reagieren, was beispielsweise durch eine Messung der Temperaturerhöhung des Kokillenkühlwassers nicht möglich ist, da die Temperaturerhöhung z. B. durch eine Erhöhung der Gießgeschwindigkeit oder den Einsatz eines weniger isolierenden Pulvers verursacht wird.This makes it possible to react almost instantaneously to a first occurrence of the supercooled bubble boiling, which is not possible, for example, by measuring the temperature increase in the mold cooling water, since the temperature increase z. B. is caused by an increase in the casting speed or the use of a less insulating powder.
Bei einer Vorrichtung der im Oberbegriff von Anspruch 3 genannten Art wird die genannte Aufgabe dadurch verwirklicht, dass an der Kokille, vorzugsweise an wenigstens einer der Kokillenplatten oder in zumindest einem der Kühlmittelkanäle Beschleunigungsgeber vorgesehen sind.In a device of the type mentioned in the preamble of claim 3, the stated object is achieved in that accelerometers are provided on the mold, preferably on at least one of the mold plates or in at least one of the coolant channels.
Eine Alternative der Messanordnung besteht darin, dass an oder außerhalb der Kokille mindestens ein Messgerät zur Erfassung der beim unterkühlen Blasensieden in den Kühlkanälen ausgesandten Schallimpulse angeordnet ist, welches mit einem Messgerät zur Erfassung des Grundrauschens der Kühlmittelströmung in den Kühlkanälen in Verbindung steht und beide Messgeräte mit Bausteinen eines Regelkreises zur Änderung der Kühlmittelparameter der Kokille zusammen wirken.An alternative of the measuring arrangement consists in that at least one measuring device for detecting the sound pulses emitted during subcooled bubble boiling in the cooling channels is arranged on or outside the mold, which is connected to a measuring device for detecting the background noise of the coolant flow in the cooling channels and both measuring devices Components of a control loop for changing the coolant parameters of the mold work together.
Aus diesem Grunde wird mit der Erfassung der Beschleunigung oder der Schallintensität des strömenden Kühlmediums zugleich der Eintritt der durch Blasenverdampfung sich einstellenden Schallwellen sicher detektiert und die Möglichkeit eröffnet, mit entsprechenden Maßnahmen gegenzusteuern.For this reason, when the acceleration or the sound intensity of the flowing cooling medium is detected, the occurrence of the sound waves caused by bubble evaporation is reliably detected and the possibility is opened up to take appropriate countermeasures.
In Ausgestaltung der Erfindung wird dies dadurch erreicht, dass nach Maßgabe der ermittelten Regelgröße beispielsweise die Geschwindigkeit und/oder der Druck des Kühlmittels in den Kühlkanälen der Kokille erhöht wird bis das Signalmuster des Grundrauschens im Gießbetrieb ohne unterkühltes Blasensieden wieder erreicht ist.In an embodiment of the invention, this is achieved in that, for example, the speed and / or the pressure of the coolant in the cooling channels of the mold is increased in accordance with the determined control variable until the signal pattern of the background noise in the casting operation is reached again without undercooled bubble boiling.
Die beim Rekondensieren entstehenden Druckwellen liegen nämlich deutlich oberhalb des Grundrauschens in der Kokillenplatte ohne unterkühltes Blasensieden.The pressure waves that occur during recondensation are clearly above the background noise in the mold plate without undercooled bubble boiling.
Mit der Erfindung wird infolge sicherer und rechtzeitiger Erfassung des Beginns eines unterkühlten Blasensiedens die Möglichkeit geschaffen, die Bildung von Temperaturunterschieden im Bereich des Badspiegels zu vermeiden und damit unterschiedliches Aufschmelzverhalten des Gießpulvers zu mindern sowie Strangfehler zu vermeiden.With the invention, as a result of the reliable and timely detection of the start of supercooled bubble boiling, the possibility is created of avoiding the formation of temperature differences in the area of the bath level and thus of reducing the melting behavior of the casting powder and preventing strand defects.
Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen schematisch dargestellten Ausführungsbeispieles.Further details, features and advantages of the invention result from the following explanation of an exemplary embodiment shown schematically in the drawings.
Es zeigen:
- Fig. 1
- eine Breitseitenwand einer Kokille mit integriertem Messgerät zur Erfassung der beim unterkühlten Blasensieden in den Kühlkanälen ausgesandten Schallimpulsen, angeordnet in einem Regelkreis.
- Fig. 2
- den Aufbau des Regelkreises.
- Fig. 1
- a broad side wall of a mold with an integrated measuring device for detecting the sound impulses emitted in the cooling channels during supercooled bubble boiling, arranged in a control loop.
- Fig. 2
- the structure of the control loop.
Figur 1 zeigt eine Breitseitenwand 11 und eine Kokille 10. In der Breitseitenwand 11 ist seitlich eine Bohrung 12 angeordnet, die einen Temperaturfühler 13 aufnimmt. Dieser hat die Aufgabe, die aktuelle Temperatur der Breitseitenwand 11 und der Kokille 10 messtechnisch zu ermitteln.FIG. 1 shows a
Figur 2 zeigt eine Messanordnung zum Erkennen von Blasensieden in den Kühlkanälen der Kokille 10 in einer nicht dargestellten Stranggießanlage.FIG. 2 shows a measuring arrangement for detecting bubble boiling in the cooling channels of the
Bei dieser Messanordnung steht ein Geber 13 zur Erfassung der beim unterkühlten Blasensieden in den Kühlkanälen ausgesandten Schallimpulse mit dem Regelkreis 14 in Verbindung. Der Regelkreis 14 besitzt als Bausteine die Messeinheiten 1 und 2 bzw. Regler, die mit Änderung der Kühlmittelparameter der Kokille zusammenwirken. Der Regler 1 empfängt mit Hilfe des Gebers 13 ein Grundrauschen als Grundmuster einer Schallemission in der Kokille im Gießbetrieb ohne unterkühltes Blasensieden. Der Regler 1 erhält aus dem Regelkreis 14 die aktuellen Werte für Wasserdruck, Wassergeschwindigkeit und Gießgeschwindigkeit sowie Schallemission und vergleicht letztere mit dem Grundmuster der Schallemission des Gebers 13 und bildet aus dem Vergleich der aktuellen Parameterdaten mit Hilfe der Vergleichseinheiten 4, 5, 6 Regelgrößen mit Hilfe des Reglers 2 zur Veränderung der Kühlparameter der Kokille 10. Auf die Vergleichseinheiten 4, 5, 6 werden zugleich Sollwerte für den Regler 2 im Reglerkreis aufgeschaltet.In this measuring arrangement, a
Nach Maßgabe der ermittelten Regelgröße im Regler 2 werden dann die aktuellen Werte für Gießgeschwindigkeit, Wassergeschwindigkeit und Wasserdruck, solange verändert, bis wieder das entsprechende Grundrauschen in der Kokille ohne unterkühltes Blasensieden erreicht ist.In accordance with the determined control variable in controller 2, the current values for casting speed, water speed and water pressure are then changed until the corresponding background noise in the mold is reached again without supercooled bubble boiling.
Claims (4)
dadurch gekennzeichnet,
dass beim Rekondensieren von Blasen entstehende Druckwellen messtechnisch erfasst und mit dem Grundrauschen in der Kokille (10) im Gießbetrieb ohne unterkühltes Blasensieden verglichen werden und aus dem Vergleich beider Messgrößen eine Regelgröße zur Veränderung der Kühlparameter der Kokille (10) ermittelt wird.Method for detecting bubble boiling in the cooling channels of a mold (10) in a continuous caster,
characterized,
that pressure waves that occur during the recondensation of bubbles are measured and compared with the background noise in the mold (10) in casting operation without supercooled bubble boiling, and a control variable for changing the cooling parameters of the mold (10) is determined from the comparison of the two measured variables.
dadurch gekennzeichnet,
dass nach Maßgabe der ermittelten Regelgröße beispielsweise die Geschwindigkeit und/oder der Druck des Kühlmittels in den Kühlkanälen der Kokille (10) erhöht wird bis wieder das Signalmuster des Grundrauschens im Gießbetrieb ohne unterkühltes Blasensieden erreicht ist.Method according to claim 1,
characterized,
that the speed and / or the pressure of the coolant in the cooling channels of the mold (10) is increased, for example, in accordance with the determined control variable until the signal pattern of the background noise is reached again in the casting operation without supercooled bubble boiling.
dadurch gekennzeichnet,
dass an der Kokille (10), vorzugsweise an wenigstens einer der Kokillenplatten (11) oder in zumindest einem der Kühlmittelkanäle Beschleunigungsgeber vorgesehen sind.Measuring arrangement for detecting bubble boiling in the cooling channels of a mold in a continuous caster,
characterized,
that accelerometers are provided on the mold (10), preferably on at least one of the mold plates (11) or in at least one of the coolant channels.
dadurch gekennzeichnet,
dass an oder außerhalb der Kokille mindestens ein Messgerät (7) zur Erfassung der beim unterkühlten Blasensieden in den Kühlkanälen ausgesandten Schallimpulse angeordnet ist, welches mit einem Messgerät zur Erfassung des Grundrauschens der Kühlmittelströmung in Kühlkanälen in Verbindung steht und beide Messgeräte mit Bausteinen eines Regelkreises (14) zur Änderung der Kühlmittelparameter der Kokille zusammen wirken.Measuring arrangement for the detection of bubble boiling in the cooling channels of a mold (10) of a continuous caster,
characterized,
that at least one measuring device (7) for detecting the sound impulses emitted during supercooled bubble boiling in the cooling channels is arranged on or outside the mold, which is connected to a measuring device for detecting the background noise of the coolant flow in cooling channels and both measuring devices with components of a control circuit (14 ) work together to change the coolant parameters of the mold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10329033A DE10329033A1 (en) | 2003-06-27 | 2003-06-27 | Method and measuring arrangement for detecting nucleate boiling in the cooling channels of a continuous casting mold |
| DE10329033 | 2003-06-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1491275A1 true EP1491275A1 (en) | 2004-12-29 |
| EP1491275B1 EP1491275B1 (en) | 2006-08-23 |
Family
ID=33395018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04012297A Expired - Lifetime EP1491275B1 (en) | 2003-06-27 | 2004-05-25 | Process for detecting nucleate boiling in the cooling channels of a continuous casting mould |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1491275B1 (en) |
| AT (1) | ATE337119T1 (en) |
| DE (2) | DE10329033A1 (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5689355A (en) * | 1979-12-21 | 1981-07-20 | Nippon Steel Corp | Detection of casting state of mold for continuous casting |
| JPS5689356A (en) * | 1979-12-21 | 1981-07-20 | Nippon Steel Corp | Detection of abnormality of mold in continuous casting |
| GB2068803A (en) * | 1980-02-13 | 1981-08-19 | Mannesmann Ag | Monitoring of continuous casting processes to obviate breakdowns or fracture of the casting |
| US4542781A (en) * | 1983-01-07 | 1985-09-24 | Klockner-Werke Aktiengesellschaft | Breakout warning method, utilizing acoustics, in a continuous casting installation and apparatus for its implementation |
| DE3632333A1 (en) * | 1986-09-24 | 1988-03-31 | Voest Alpine Ag | Device for monitoring the vibrations of a continuous casting mould |
| EP0881018A2 (en) * | 1997-05-31 | 1998-12-02 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for measuring and controlling temperature and quantity of cooling water for watercooled mould walls of a continuous casting mould |
| DE19838331A1 (en) * | 1997-05-31 | 2000-03-02 | Schloemann Siemag Ag | Measuring and control of the temperature and volume of cooling water for a continuous casting mold involves adjusting the water flow rate and pressure at the exit from the mold plates |
| EP0992304A1 (en) * | 1998-08-24 | 2000-04-12 | Sms Schloemann-Siemag Aktiengesellschaft | Process for measuring and regulating temperature and quantity of cooling water in the walls of a continuous casting mould |
-
2003
- 2003-06-27 DE DE10329033A patent/DE10329033A1/en not_active Withdrawn
-
2004
- 2004-05-25 EP EP04012297A patent/EP1491275B1/en not_active Expired - Lifetime
- 2004-05-25 DE DE502004001245T patent/DE502004001245D1/en not_active Expired - Fee Related
- 2004-05-25 AT AT04012297T patent/ATE337119T1/en not_active IP Right Cessation
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5689355A (en) * | 1979-12-21 | 1981-07-20 | Nippon Steel Corp | Detection of casting state of mold for continuous casting |
| JPS5689356A (en) * | 1979-12-21 | 1981-07-20 | Nippon Steel Corp | Detection of abnormality of mold in continuous casting |
| GB2068803A (en) * | 1980-02-13 | 1981-08-19 | Mannesmann Ag | Monitoring of continuous casting processes to obviate breakdowns or fracture of the casting |
| US4542781A (en) * | 1983-01-07 | 1985-09-24 | Klockner-Werke Aktiengesellschaft | Breakout warning method, utilizing acoustics, in a continuous casting installation and apparatus for its implementation |
| DE3632333A1 (en) * | 1986-09-24 | 1988-03-31 | Voest Alpine Ag | Device for monitoring the vibrations of a continuous casting mould |
| EP0881018A2 (en) * | 1997-05-31 | 1998-12-02 | Sms Schloemann-Siemag Aktiengesellschaft | Method and device for measuring and controlling temperature and quantity of cooling water for watercooled mould walls of a continuous casting mould |
| DE19838331A1 (en) * | 1997-05-31 | 2000-03-02 | Schloemann Siemag Ag | Measuring and control of the temperature and volume of cooling water for a continuous casting mold involves adjusting the water flow rate and pressure at the exit from the mold plates |
| EP0992304A1 (en) * | 1998-08-24 | 2000-04-12 | Sms Schloemann-Siemag Aktiengesellschaft | Process for measuring and regulating temperature and quantity of cooling water in the walls of a continuous casting mould |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 0051, no. 62 (M - 092) 17 October 1981 (1981-10-17) * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE10329033A1 (en) | 2005-01-13 |
| EP1491275B1 (en) | 2006-08-23 |
| DE502004001245D1 (en) | 2006-10-05 |
| ATE337119T1 (en) | 2006-09-15 |
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