EP0885675B1 - Method and apparatus for forseeing a break-out during continuous casting of steel with an oscillating mould - Google Patents
Method and apparatus for forseeing a break-out during continuous casting of steel with an oscillating mould Download PDFInfo
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- EP0885675B1 EP0885675B1 EP98110735A EP98110735A EP0885675B1 EP 0885675 B1 EP0885675 B1 EP 0885675B1 EP 98110735 A EP98110735 A EP 98110735A EP 98110735 A EP98110735 A EP 98110735A EP 0885675 B1 EP0885675 B1 EP 0885675B1
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- oscillation
- chill mould
- strip
- mold
- measurement
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 title claims description 14
- 239000010959 steel Substances 0.000 title claims description 14
- 238000009749 continuous casting Methods 0.000 title claims description 11
- 230000010355 oscillation Effects 0.000 claims abstract description 52
- 238000005259 measurement Methods 0.000 claims abstract description 42
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052802 copper Inorganic materials 0.000 claims abstract description 18
- 239000010949 copper Substances 0.000 claims abstract description 18
- 230000000052 comparative effect Effects 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims abstract description 8
- 230000001133 acceleration Effects 0.000 claims abstract description 5
- 238000011156 evaluation Methods 0.000 claims description 28
- 238000005266 casting Methods 0.000 claims description 13
- 238000005461 lubrication Methods 0.000 claims description 11
- 230000001154 acute effect Effects 0.000 claims description 5
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 239000000314 lubricant Substances 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 2
- 230000002265 prevention Effects 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 14
- 230000002123 temporal effect Effects 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 6
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 210000002105 tongue Anatomy 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
- B22D11/053—Means for oscillating the 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
Definitions
- the invention relates to a method and a device for early breakthrough detection in the continuous casting of steel with a copper plate oscillating mold, through continuous and comparative measurement of operating parameters, being used to increase the likelihood of a targeted Assessment of signs of an acute breakthrough tendency to compare two Measurement data both with one another and with measurement data from at least one third series of measurements can be coupled and analyzed online.
- a plate mold for slabs is known, the mold walls Have cooling chambers that include limited cooling areas.
- a breakthrough early detection is with satisfactory accuracy due to the measurement of the Heat flows in the mold are not feasible.
- DE 195 29 931 C1 describes a plate mold for the production of strands made of steel, in particular thin slabs, the broad side walls of which are at least three have adjacent and independent cooling segments. There are temperature sensors in the wall of the chamber facing the strand arranged with which at least the temperature differences between the individual Chambers or zones are recorded. A suggestion to use these means for areas Expand temperature measurement for a mold and for This document is for early breakthrough detection also not to be removed.
- An acceleration measurement of the mold is also possible with the help of at least three Accelerometer on the mold known, the deviations in the Record mold movement (wobble) as a breakthrough criterion.
- the object of the invention to provide a method and a device for early breakthrough detection, with the highest possible probability for a precise assessment of signs of an acute breakthrough tendency in continuous casting of steel is made possible.
- the method and the device should be as possible be largely feasible with known means and measuring devices.
- the problem is solved with a method for early breakthrough detection in the continuous casting of steel mentioned in the preamble of claim 1 Kind with the invention in that the local and temporal temperature distribution measured in the copper plates and analyzed the measurement data obtained, and that the third series of measurements is the one dependent on the effectiveness of the lubrication Partial frictional engagement between the mold and the casting strand below the Mold by comparative measurement of the mold oscillation and the strand oscillation measured and the measurement data obtained together with the measurement data coupled from the temperature distribution and the path-time behavior of the mold and the result is analyzed mathematically.
- This procedure is based on the knowledge that the probability of Security of a clear early detection of a breakthrough with the link between several systems increases significantly.
- This partial adhesion or the effect of the lubrication between the mold and the strand can be determined, for example, with the aid of a line scan camera.
- an embodiment of the invention provides that comparative Measurements of mold oscillation and strand oscillation on different Circumferential areas of mold and strand are carried out.
- a corresponding design of the method therefore provides that the different circumferential areas of the mold or the strand occurring Disturbances in the uniformity of the friction due to comparative measurements can be localized over the strand circumference or over the strand width.
- an embodiment of the method provides that the mold oscillation and the strand oscillation to be compared with this is preferred measured four corner points of the mold, and compared continuously and thereby disturbances recognized by analysis of the measurement data obtained in evaluation electronics and compared with predetermined, breakthrough signals and at Significant breakthrough trend Measures to prevent breakthrough be initiated.
- the casting speed can be reduced and / or a change in the addition amount or composition of the lubricant. In particularly critical cases a combination of both measures can be carried out.
- Figure 1 shows a device for early breakthrough detection in continuous casting of steel with a copper plate 2, 3 formed by a vibration exciter 5 plate mold 1 excitable in oscillating vibrations, in particular to carry out the method according to the invention.
- This includes a measuring and Evaluation device with the following elements: at least one accelerometer 10.1 - 10.4 for oscillation, a number of thermocouples 11 in the mold plates, a line camera 12 for recognizing the strand oscillation, a speed meter 13 for continuous casting speeds, a Evaluation electronics 21 for temperature measurements in the mold plates, an evaluation electronics 22 for strand oscillation, a central evaluation processing unit 30 and an early warning signal generator.
- the function of the device is as follows:
- the evaluation computing unit 30 As soon as the evaluation computing unit 30 is a combination which is dangerous for breakthroughs receives measurement data from the individual electronic evaluation units 20 - 22, it generates a pulse for early warning and sends this to the signal generator 31 further, which in turn, symbolized by the number 100, a countermeasure initiates, for example on actuators to reduce the casting speed 13 or acts to the increased task of lubricants 40.
- FIG. 1 further shows a cylindrical immersion pouring tube 4 for feeding liquid Steel 41 and the cast strand 6 emerging from the underside of the mold 1 with clearly recognizable oscillation markings 7 on its circumference.
- Accelerometers 10.1 to 10.4 are arranged at corner points of the mold 1 and firmly connected to the top of the mold 1. This accelerometer the measuring lines 15.1 to 15.4 are assigned and the evaluation electronics 20 activated. Furthermore, these evaluation electronics 20 are also the signals of the vibration exciter 5 are connected to the measuring lines 25.1 and 25.2, causing disturbances in the path-time behavior of the mold movement in deviation of the forcibly induced oscillation excitation of the oscillators 5 can be detected.
- the results of the image acquisition of oscillation marks with the help of the line scan camera 12 are connected to the measuring line 12.1 of the evaluation electronics 22 which in turn forwards a modulated signal to the central evaluation unit 30.
- plates of the copper mold walls 2 are one Number of temperature sensors 11 embedded therein, their measurement data fed to the measuring and evaluation electronics 21 with a multi-core measuring line 11.1 and after their evaluation, a signal to the central evaluation unit 30 is forwarded.
- the term multi-core measuring line 11.1 is to be understood be that each individual thermocouple 11 an individual measurement result passes on to the electronics 21 via an individual wire of the measuring line 11.1 and, for example, thereby capable of local uniformity or non-uniformity to locate the temperature distribution of a chilled plate.
- FIG. 2 shows two oscillograms A and B.
- Oscillogram A shows the typical course of a disturbance in the path-time behavior of the mold 1, for example as a result of a disturbance in the uniformity of the friction between the mold and the strand.
- the oscillogram B shows a reciprocal vibration behavior of the cast strand 6.
- Figure 3 shows the oscillogram C for a normal mold oscillation D for normal strand oscillation without interference. With C1 there is a noticeable oscillation the mold is drawn. A conspicuous string oscillation is shown with D1. Using the hatched fields C-D between normal Oscillation C of the mold and normal oscillation D of the cast strand can be deduce that a normal lubrication behavior or a normal, by design The expected partial adhesion between the mold and the strand shell is available is.
- the hatched field C1 - D1 shows a breakthrough criterion, because of a conspicuous lubrication behavior (defective lubrication) or an increased Partial adhesion between the mold and the strand shell with a high probability has led to a change in the field C-D in the direction of C1-D1.
- the early warning signal generator 31 would then be equipped with a Command to the actuators 100 e.g. the casting speed 13 e.g. by means of the Reduce the roller drive of the continuous caster and at the same time reduce the amount of lubricant 40 change in the sense of a more effective lubrication.
- the time-controlled Decrease in casting speed can be between 50% and 100% for a maximum Time of 2 minutes. This could be through a targeted Early warning prevents an actual breakthrough of liquid steel become. If the breakthrough is prevented, the accelerates in a controlled manner Strands to target speed.
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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)
Abstract
Description
Die Erfindung betrifft ein Verfahren sowie eine Vorrichtung zur Durchbruchfrüherkennung beim Stranggießen von Stahl mit einer mit Kupferplatten ausgebildeten, oszillierenden Kokille, durch fortlaufende und vergleichende Messung von Betriebsparametern, wobei zur Erhöhung der Wahrscheinlichkeit einer zielgenauen Beurteilung von Anzeichen einer akuten Durchbruchs-Tendenz zwei zu vergleichende Meßdaten sowohl miteinander, als auch mit Meßdaten wenigstens einer dritten Meßreihe gekoppelt und online analysiert werden.The invention relates to a method and a device for early breakthrough detection in the continuous casting of steel with a copper plate oscillating mold, through continuous and comparative measurement of operating parameters, being used to increase the likelihood of a targeted Assessment of signs of an acute breakthrough tendency to compare two Measurement data both with one another and with measurement data from at least one third series of measurements can be coupled and analyzed online.
Verfahren zur Durchbruchfrüherkennung beim Stranggießen von Stahl mit einer mit Kupferplatten ausgebildeten oszillierenden Kokille sind bisher nur im Versuchsstadium bekannt und basieren bspw. auf Thermoelementen mit Zungen in den Kupferplatten der Kokillen. Die Durchbruchfrüherkennung wird als wichtiges Betriebsmittel angesehen, um insbesondere beim Gießen von Dünnbrammen bspw. mit einer Geschwindigkeit bis zu 6 m/Minute und darüber hinaus die Risiken und Betriebsausfälle bei Durchbrüchen der noch äußerst empfindlichen Strangschale zu vermeiden. Dabei werden Ungleichmäßigkeiten der Temperaturverteilung in den Kupferplatten über die Gießzeit gemessen, analysiert und aus den Ergebnissen Signale abgeleitet, die als Kriterien für einen Durchbruch gelten sollen. Method for early detection of breakthroughs in the continuous casting of steel with a So far, oscillating molds made with copper plates have only been in the experimental stage known and are based for example on thermocouples with tongues in the copper plates of the molds. Breakthrough early detection is considered important Operating resources considered to be particularly useful when casting thin slabs For example, at a speed of up to 6 m / minute and beyond the risks and breakdowns in the event of breakthroughs in the still extremely sensitive strand shell to avoid. This causes irregularities in the temperature distribution measured in the copper plates over the casting time, analyzed and from the results Signals derived that should be considered criteria for a breakthrough.
Wegen der relativ großen Wärmekapazität der Kupferplatten reagiert das bekannte Verfahren mit erheblicher Zeitverzögerung und kann daher nur mit erheblichen Einschränkungen als einigermaßen sicher gelten.Because of the relatively large heat capacity of the copper plates, the known reacts Procedures with significant time delays and can therefore only be performed with significant Restrictions are considered reasonably safe.
Bei einem anderen Verfahren wird mit Hilfe von Beschleunigungsmessern versucht, durchbruchrelevante Störungen in der Bewegungsform bezüglich dreier Raumachsen während der Kokillenoszillation zu erfassen. Mängel bei diesem System treten insofern auf, als diese Messungen nicht immer einen Durchbruch eindeutig mit hoher Wahrscheinlichkeit erfassen. Dies hat zur Folge, dass vom Meßsystem vor einem Durchbruch entweder Fehlalarme ausgelöst oder ein Alarm zu spät bzw. überhaupt nicht gegeben wird.Another method tries to use accelerometers to breakthrough disorders in the form of movement with respect to three Capture spatial axes during mold oscillation. Shortcomings in this system occur in that these measurements are not always clear breakthroughs with a high probability. This means that the measuring system before a breakthrough, either false alarms triggered or an alarm closed is given late or not at all.
Aus der DE 24 15 224 C3 ist eine Plattenkokille für Brammen bekannt, deren Kokillenwände Kühlkammern besitzen, die begrenzte Kühlbereiche umfassen. an die Wasserzu- und -abflußleitungen der Breitseiten sind Meßglieder zur Bestimmung der abgeführten Wärmemenge bzw. der Kühlleistungen angeschlossen. Weiterhin wird in den Meßgliedem gleichzeitig ein Durchschnittswert der Kühlleistung der Kühlkammern gebildet, welcher einem Durchschnittsbildner zugeleitet wird, mit dem die Konizität der Schmalseiten gesteuert werden kann. Eine Durchbruchfrüherkennung mit zufriedenstellender Genauigkeit ist aufgrund der Messung der Wärmeströme in der Kokille nicht durchführbar.From DE 24 15 224 C3 a plate mold for slabs is known, the mold walls Have cooling chambers that include limited cooling areas. to the Water supply and drain lines on the broad sides are measuring elements for determination the amount of heat dissipated or the cooling capacities connected. Farther an average value of the cooling capacity of the Cooling chambers formed, which is fed to an average former, with which the conicity of the narrow sides can be controlled. A breakthrough early detection is with satisfactory accuracy due to the measurement of the Heat flows in the mold are not feasible.
Aus der DE 41 17 073 C2 ist es bekannt, mit Hilfe einer kalorimetrischen Messung an einer Brammenkokille den integralen und spezifischen Wärmetransport an jeder einzelnen Kupferplatte zu bestimmen. Ein Vergleich der spezifischen Wärmeströme von der dem Stahl zugewandten Kupferplattenseite zur wassergekühlten Seite speziell der Schmalseiten, mit denen der zwei Breitseiten ermöglicht die Regelung der Schmalseitenkonizität unabhängig von den im einzelnen gewählten Gießparametem. Auch diese bekannte Vorrichtung eignet sich nicht für eine einigermaßen sichere Früherkennung einer akuten Durchbruchgefahr. From DE 41 17 073 C2 it is known with the help of a calorimetric measurement the integral and specific heat transfer to everyone on a slab mold to determine individual copper plate. A comparison of the specific heat flows from the side of the copper plate facing the steel to the water-cooled side Side especially the narrow sides with which the two broad sides enables the Regulation of the narrow side taper regardless of the individually selected Gießparametem. This known device is also not suitable for a reason Safe early detection of an acute breakthrough risk.
Die DE 195 29 931 C1 beschreibt eine Plattenkokille zur Erzeugung von Strängen aus Stahl, insbesondere Dünnbrammen, deren Breitseitenwände mindestens drei nebeneinanderliegende und voneinander unabhängige Kühlsegmente aufweisen. In der dem Strang zugewandten Wandung der Kammem sind Temperaturfühler angeordnet, mit denen mindestens die Temperaturdifferenzen zwischen den einzelnen Kammern bzw. Zonen erfaßt werden. Eine Anregung, diese Mittel zur bereichsweisen Temperaturerfassung bei einer Kokille weiter auszubauen und für eine Durchbruchfrüherkennung in Anspruch zu nehmen, ist diesem Dokument ebenfalls nicht zu entnehmen.DE 195 29 931 C1 describes a plate mold for the production of strands made of steel, in particular thin slabs, the broad side walls of which are at least three have adjacent and independent cooling segments. There are temperature sensors in the wall of the chamber facing the strand arranged with which at least the temperature differences between the individual Chambers or zones are recorded. A suggestion to use these means for areas Expand temperature measurement for a mold and for This document is for early breakthrough detection also not to be removed.
Außerdem sind Systeme bekannt, bei denen mittels in der Kokillenwand eingelassener Thermoelemente die Temperaturänderung und Verteilung über die Gießzeit beobachtet und über Differenzwertbildung eine Durchbruchsicherung aufgebaut wird.In addition, systems are known in which means embedded in the mold wall Thermocouples the temperature change and distribution over the casting time observed and a breakthrough protection built up by forming the difference value becomes.
Auch ist eine Beschleunigungsmessung der Kokille mit Hilfe von mindestens drei Beschleunigungsmeßgebem auf der Kokille bekannt, die Abweichungen in der Kokillenbewegung (Taumeln) als Durchbruchkriterium erfassen.An acceleration measurement of the mold is also possible with the help of at least three Accelerometer on the mold known, the deviations in the Record mold movement (wobble) as a breakthrough criterion.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung zur Durchbruchfrüherkennung anzugeben, mit der eine höchstmögliche Wahrscheinlichkeit für eine zielgenaue Beurteilung von Anzeichen einer akuten Durchbruchs-Tendenz beim Stranggießen von Stahl ermöglicht wird. Dabei soll das Verfahren und die Vorrichtung möglichst weitgehend mit bekannten Mitteln und Meßvorrichtungen durchführbar sein.Starting from the aforementioned prior art, the object of the invention to provide a method and a device for early breakthrough detection, with the highest possible probability for a precise assessment of signs of an acute breakthrough tendency in continuous casting of steel is made possible. The method and the device should be as possible be largely feasible with known means and measuring devices.
Die Lösung der Aufgabe gelingt bei einem Verfahren zur Durchbruchfrüherkennung
beim Stranggießen von Stahl der im Oberbegriff von Anspruch 1 genannten
Art mit der Erfindung dadurch, dass die örtliche und zeitliche Temperatur-Verteilung
in den Kupferplatten gemessen und die erhaltenen Meßdaten analysiert,
und dass als dritte Meßreihe der von der Wirksamkeit der Schmierung abhängige
Reibungs-Teilkraftschluß zwischen Kokille und Gießstrang unterhalb der
Kokille durch vergleichende Messung der Kokillenoszillation und der Strangoszillation
gemessen und die dabei erhaltenen Meßdaten zusammen mit den Meßdaten
aus der Temperatur-Verteilung sowie dem Weg-Zeit-Verhalten der Kokille gekoppelt
und das Ergebnis rechnerisch analysiert wird.The problem is solved with a method for early breakthrough detection
in the continuous casting of steel mentioned in the preamble of
Diesem Verfahren liegt die Erkenntnis zugrunde, dass die Wahrscheinlichkeit der Sicherheit einer eindeutigen Früherkennung eines Durchbruchs mit der Verknüpfung mehrerer Systeme untereinander signifikant steigt.This procedure is based on the knowledge that the probability of Security of a clear early detection of a breakthrough with the link between several systems increases significantly.
Hierbei ist berücksichtigt, dass die Strangoszillation als resultierende Bewegung aus der Kokillenoszillation und des Koeffizienten der Begleitreibung zwischen Strang und Kokille entsteht. Dabei wird die sich während einer Strangoszillation aufbauende Reibkraft zwischen Kokille und Strangschale bspw. durch folgende Parameter beeinflußt:
- Ölschmierung oder
- Gießschlackenschmierung und
- Art der Kupferplatte mit und ohne Beschichtung, z.B. Cr, Ni, etc.
- Oil lubrication or
- Cast slag lubrication and
- Type of copper plate with and without coating, e.g. Cr, Ni, etc.
Dieser Teil-Kraftschluß bzw. auch der Effekt der Schmierung zwischen Kokille und
Strang kann bspw. mit Hilfe einer Zeilenkamera bestimmt werden. Durch vergleichende
Messungen der Strangoszillation unterhalb der Kokille mit der Kokillenoszillation,
die mit Hilfe von Beschleunigungsmessern an der Kokille durchgeführt
werden, kann die Reibung
Infolgedessen sieht eine Ausgestaltung der Erfindung vor, dass vergleichende Messungen von Kokillenoszillation und Strangoszillation an unterschiedlichen Umfangsbereichen von Kokille und Strang durchgeführt werden.As a result, an embodiment of the invention provides that comparative Measurements of mold oscillation and strand oscillation on different Circumferential areas of mold and strand are carried out.
Eine entsprechende Ausgestaltung des Verfahrens sieht daher vor, dass die an unterschiedlichen Umfangsbereichen der Kokille bzw. des Stranges auftretenden Störungen in der Gleichförmigkeit der Reibung durch vergleichende Messungen über den Strangumfang bzw. über die Strangbreite lokalisiert werden.A corresponding design of the method therefore provides that the different circumferential areas of the mold or the strand occurring Disturbances in the uniformity of the friction due to comparative measurements can be localized over the strand circumference or over the strand width.
Entsprechendenfalls sieht eine Ausgestaltung des Verfahrens vor, dass die Kokillenoszillation und die mit dieser zu vergleichende Strangoszillation bevorzugt an vier Eckpunkten der Kokille gemessen, und fortlaufend verglichen und dabei Störungen mittels Analyse der erhaltenen Meßdaten in einer Auswertelektronik erkannt und mit vorgegebenen, durchbruchsrelevanten Signalen verglichen und bei erkennbarer Durchbruchstendenz Maßnahmen zur Verhinderung eines Durchbruchs eingeleitet werden. Zu diesem Zweck kann eine Absenkung der Gießgeschwindigkeit und/oder eine Änderung von Zugabemenge oder Zusammensetzung des Schmiermittels vorgenommen werden. In besonders kritischen Fällen kann eine Kombination beider Maßnahmen zur Durchführung gebracht werden.Correspondingly, an embodiment of the method provides that the mold oscillation and the strand oscillation to be compared with this is preferred measured four corner points of the mold, and compared continuously and thereby disturbances recognized by analysis of the measurement data obtained in evaluation electronics and compared with predetermined, breakthrough signals and at Significant breakthrough trend Measures to prevent breakthrough be initiated. For this purpose, the casting speed can be reduced and / or a change in the addition amount or composition of the lubricant. In particularly critical cases a combination of both measures can be carried out.
Zweckmäßig kann die Beobachtung der Strangoszillation unter Verwendung einer Zeilenkamera durchgeführt werden. Dabei wird dann die Erscheinung genutzt, dass an der Außenseite der Strangschale oszillationsbedingte Markierungen sichtbar sind, die bei entsprechender Einstellung von der Zeilenkamera erkannt und ausgewertet werden. Wie bereits eingangs dargelegt, kann zur Erhöhung der Wahrscheinlichkeit einer zielgenauen Beurteilung von Anzeichen einer akuten Durchbruchs-Tendenz eine Auswertung der Meßergebnisse der Kokillen- und Strangbewegung einerseits und des Temperaturfeldes in den Kokillenplatten oder des Weg-Zeit-Verhaltens der Kokillenbewegung andererseits gekoppelt werden.The observation of the strand oscillation using a Line scan can be performed. The appearance is then used, that on the outside of the strand shell marks due to oscillation are visible, which are recognized by the line scan camera with the appropriate setting and be evaluated. As already stated at the beginning, can increase the Probability of a precise assessment of signs of acute Breakthrough tendency an evaluation of the measurement results of the mold and Strand movement on the one hand and the temperature field in the mold plates or the path-time behavior of the mold movement on the other hand.
Eine Vorrichtung zur Durchbruchfrüherkennung beim Stranggießen von Stahl mit einer mit Kupferplatten ausgebildeten, von einem Schwingungserreger in oszillierende Schwingungen erregbaren Plattenkokille, wobei diese eine Meß- und Auswerteinrichtung besitzt, umfaßt die folgenden Elemente
- wenigstens einen Beschleunigungsmesser für die Oszillation,
- eine Anzahl von Thermoelementen in den Kokillenplatten,
- eine Zeilenkamera zur Erkennung der Strangoszillation,
- einen Geschwindigkeitsmesser für Stranggießgeschwindigkeit,
- eine Auswertelektronik für die Oszillationsbeschleunigung,
- eine Auswertelektronik für Temperaturmessungen in den Kokillenplatten,
- eine Auswertelektronik für die Strangoszillation,
- eine zentrale Auswertungs-Recheneinheit,
- einen Frühwarnungssignalgeber.
- at least one accelerometer for the oscillation,
- a number of thermocouples in the mold plates,
- a line scan camera to detect strand oscillation,
- a speed meter for continuous casting speed,
- evaluation electronics for oscillation acceleration,
- evaluation electronics for temperature measurements in the mold plates,
- evaluation electronics for strand oscillation,
- a central evaluation processing unit,
- an early warning signal generator.
Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen dargestellten Ausführungsbeispielen. Es zeigen
Figur 1- eine Vorrichtung zur Durchführung des Verfahrens nach der Erfindung,
Figur 2- ein Diagramm der Oszillationsbewegungen von Kokille und Strang bei einer auftretenden Störung der Gleichförmigkeit,
Figur 3- ein Oszillationsdiagramm mit signifikanter Tendenz eines Durchbruchs.
- Figure 1
- a device for performing the method according to the invention,
- Figure 2
- 2 shows a diagram of the oscillation movements of the mold and the strand in the event of a disturbance in the uniformity,
- Figure 3
- an oscillation diagram with a significant tendency to break through.
Figur 1 zeigt eine Vorrichtung zur Durchbruchfrüherkennung beim Stranggießen
von Stahl mit einer mit Kupferplatten 2, 3 ausgebildeten, von einem Schwingungserreger
5 in oszillierende Schwingungen erregbaren Plattenkokille 1, insbesondere
zur Durchführung des Verfahrens nach der Erfindung. Diese umfaßt eine Meß-und
Auswerteeinrichtung mit folgenden Elementen: wenigstens einen Beschleunigungsmesser
10.1 - 10.4 für die Oszillation, eine Anzahl von Thermoelementen
11 in den Kokillenplatten, eine Zeilenkamera 12 zur Erkennung der Strangoszillation,
einen Geschwindigkeitsmesser 13 für Stranggießgeschwindigkeiten, eine
Auswertelektronik 21 für Temperaturmessungen in den Kokillenplatten, eine Auswertelektronik
22 für die Strangoszillation, eine zentrale Auswertungs-Recheneinheit
30 sowie einen Frühwarnungssignalgeber.Figure 1 shows a device for early breakthrough detection in continuous casting
of steel with a
Die Funktion der Vorrichtung ist folgende:The function of the device is as follows:
Sobald die Auswertungs-Recheneinheit 30 eine durchbruchsgefährliche Kombination
von Meßdaten aus den einzelnen Auswertelektronik-Einheiten 20 - 22 empfängt,
erzeugt sie einen Impuls zur Frühwamung und gibt diesen an den Signalgeber
31 weiter, der seinerseits, symbolisiert durch die Ziffer 100, eine Abwehrmaßnahme
einleitet, bspw. auf Stellglieder zur Verringerung der Gießgeschwindigkeit
13 oder zur vermehrten Aufgabe von Schmiermitteln 40 einwirkt.As soon as the
Figur 1 zeigt weiter ein zylinderförmiges Tauchgießrohr 4 zur Aufgabe von flüssigem
Stahl 41 und den aus der Unterseite der Kokille 1 austretenden Gußstrang 6
mit deutlich erkennbaren Oszillations-Markierungen 7 an dessen Umfang. An vier
Eckpunkten der Kokille 1 sind Beschleunigungsmesser 10.1 bis 10.4 angeordnet
und mit der Oberseite der Kokille 1 fest verbunden. Diesen Beschleunigungsmessem
sind die Meßleitungen 15.1 bis 15.4 zugeordnet und der Auswertungs-Elektronik
20 aufgeschaltet. Weiterhin sind dieser Auswertungs-Elektronik 20 auch
die Signale der Schwingungserreger 5 mit den Meßleitungen 25.1 und 25.2 aufgeschaltet,
wodurch Störungen im Weg-Zeit-Verhalten der Kokillenbewegung in Abweichung
von der zwangsweise induzierten Oszillations-Erregung der Oszillatoren
5 erfaßt werden können.FIG. 1 further shows a cylindrical immersion pouring tube 4 for feeding
Die Ergebnisse der Bilderfassung von Oszillationsmarken mit Hilfe der Zeilenkamera
12 sind mit der Meßleitung 12.1 der Auswertelektronik 22 aufgeschaltet, die
ihrerseits ein moduliertes Signal an die zentrale Auswert-Einheit 30 weiterleitet.
Und schließlich sind in den Breitseiten Platten der kupfernen Kokillenwände 2 eine
Anzahl von darin eingebetteten Temperaturfühlem 11 gezeigt, deren Meßdaten
mit einer vieladrigen Meßleitung 11.1 der Meß- und Auswert-Elektronik 21 zugeleitet
und nach deren Auswertung ein Signal an die zentrale Auswert-Einheit 30
weitergeleitet wird. Unter dem Begriff einer vieladrigen Meßleitung 11.1 soll verstanden
werden, dass jedes einzelne Thermoelement 11 ein individuelles Meßergebnis
über eine individuelle Ader der Meßleitung 11.1 an die Elektronik 21 weitergibt
und bspw. dadurch in der Lage ist, die örtliche Gleichförmigkeit oder Ungleichförmigkeit
der Temperaturverteilung einer gekühlten Platte zu lokalisieren.The results of the image acquisition of oscillation marks with the help of the
Außerdem kann die Temperaturdifferenzmessung des Kokillenkühlwassers pro
Kokillenplatte 2, 2.1 mit zur Auswertung und zur Erhöhung der Wahrscheinlichkeit
der Durchbruchfrüherkennung herangezogen werden. Hierbei kann sowohl der
integrale Wert pro Kokillenplatte 2, 2.1; 3, 3.1 als auch partielle integrale Werte im
Falle der Breitseiten 2a-z; 2.1 a-z herangezogen werden.In addition, the temperature difference measurement of the mold cooling water per
Figur 2 zeigt zwei Oszillogramme A und B. Oszillogramm A zeigt den typischen
Verlauf einer Störung im Weg-Zeit-Verhalten der Kokille 1, bspw. infolge einer
auftretenden Störung in der Gleichförmigkeit der Reibung zwischen Kokille und
Strang. Vergleichend dazu zeigt das Oszillogramm B ein reziprokes Schwingungsverhalten
des Gußstranges 6. Unter der Annahme einer dramatischen Verschlechterung
des Gleitreibungs-Koeffizienten zwischen den Innenwänden der
Kokille und der sich bildenden Strangschale verbrauchen die sich aufbauenden
Schwingungen mehr Arbeit, weshalb bei gleichbleibender Frequenz die Amplitude
der Kokille 1 von anfänglich H1 auf H2 absinkt, während gleichzeitig durch mehr
Haftreibung die Strangschale des Stranges 6 stärker in Schwingungen erregt wird
und daher ihre ursprüngliche Amplitude h1 in h2 vergrößert wird, so dass die entsprechenden
Auswert-Elektroniken zweifelsfrei eine Störung in Schmierungsverhalten
mit der Folge eines erhöhten Teilkraftschlusses analysieren können.FIG. 2 shows two oscillograms A and B. Oscillogram A shows the typical course of a disturbance in the path-time behavior of the
Figur 3 zeigt das Oszillogramm C für eine normal ablaufende Kokillenoszillation D für eine normale Strangoszillation ohne Störungen. Mit C1 ist eine auffällige Oszillation der Kokille eingezeichnet. Mit D1 ist eine auffällige Strangoszillation eingezeichnet. Anhand der schraffiert dargestellten Felder C-D zwischen normaler Oszillation C der Kokille und normaler Oszillation D des Gußstranges läßt sich ableiten, dass ein normales Schmierverhalten bzw. ein normaler, auslegungsgemäß zu erwartender Teilkraftschluß zwischen Kokille und Strangschale vorhanden ist. Dagegen zeigt das schraffiert dargestellte Feld C1 - D1 ein Durchbruchkriterium, da ein auffälliges Schmierverhalten (Mängelschmierung) oder ein erhöhter Teilkraftschluß zwischen Kokille und Strangschale mit hoher Wahrscheinlichkeit zu einer Veränderung des Feldes C-D in Richtung C1-D1 geführt hat.Figure 3 shows the oscillogram C for a normal mold oscillation D for normal strand oscillation without interference. With C1 there is a noticeable oscillation the mold is drawn. A conspicuous string oscillation is shown with D1. Using the hatched fields C-D between normal Oscillation C of the mold and normal oscillation D of the cast strand can be deduce that a normal lubrication behavior or a normal, by design The expected partial adhesion between the mold and the strand shell is available is. In contrast, the hatched field C1 - D1 shows a breakthrough criterion, because of a conspicuous lubrication behavior (defective lubrication) or an increased Partial adhesion between the mold and the strand shell with a high probability has led to a change in the field C-D in the direction of C1-D1.
In diesem Falle würde dann bspw. der Frühwarnungs-Signalgeber 31 mit einem
Befehl an die Stellglieder 100 bspw. die Gießgeschwindigkeit 13 z.B. mittels des
Rollenantriebs der Stranggießanlage reduzieren und zugleich die Schmiermittelaufgabe
40 im Sinne einer effektiveren Schmierung ändem. Das zeitkontrollierte
Absinken der Gießgeschwindigkeit kann zwischen 50% und 100% für eine maximale
Zeit von 2 Minuten erfolgen. Auf diese Weise könnte durch eine zielgenaue
Frühwamung ein tatsächlicher Durchbruch von flüssigem Stahl sicher verhindert
werden. Ist der Durchbruch verhindert, erfolgt ein kontrolliertes Beschleunigen des
Stranges auf Soll-Geschwindigkeit. In this case, the early
- 11
- Plattenkokilleplate mold
- 2, 2.12, 2.1
- Kupferplatte, BreitseiteCopper plate, broadside
- 2 a-z}2 a-z}
- TemperaturdifferenzmessungTemperature difference measurement
- 2.1 a-z}2.1 a-z}
- pro Breitseiteper broadside
- 3, 3.13, 3.1
- Kupferplatte, SchmalseiteCopper plate, narrow side
- 44
- Tauchgießrohrimmersing
- 55
- Schwingungserregervibration exciter
- 66
- Gußstrangcast strand
- 77
- Oszillationsmarkierungenoscillation marks
- 8 9 10.1-10.48th 9 10.1-10.4
- Beschleunigungsmesseraccelerometer
- 1111
- Thermoelementethermocouples
- 11.111.1
- Meßleitung von 11Test lead from 11
- 1212
- Zeilenkameraline camera
- 12.112.1
- Meßleitung von 12Test lead from 12
- 1313
- Geschwindigkeitsmesserspeedometer
- 14 15.1-15.414 15.1-15.4
- Meßleitungentest leads
- 1616
- Thermoelemente von 2; 2.1 zur TemperaturdifferenzmessungThermocouples of 2; 2.1 for temperature difference measurement
- 16.116.1
- Meßleitung von 16Measuring line from 16
- 18 19 2018 19 20
- Auswertelektronik für Oszillationsbeschleunigung Evaluation electronics for oscillation acceleration
- 2121
- Auswertelektronik für TemperaturmessungEvaluation electronics for temperature measurement
- 2222
- Auswertelektronik für StrangoszillationEvaluation electronics for string oscillation
- 2323
- Auswertelektronik für TemperaturdifferenzmessungEvaluation electronics for temperature difference measurement
- 24 25.1; 25.224 25.1; 25.2
- Meßleitungen von 5Test leads from 5
- 26 27 28 29 3026 27 28 29 30
- Zentrale Auswertungs-RecheneinheitCentral evaluation processing unit
- 3131
- FrühwarnsignalgeberEarly warning signal generator
- 4040
- Schmiermittelaufgabelubricant task
- 4141
- flüssiger Stahlmolten steel
- 100100
- Stellgliederactuators
- AA
- Oszillogramm KokilleChill oscillogram
- BB
- Oszillogramm GußstrangCast line oscillogram
- H1 H 1
- Amplitude der Kokille ohne StörungAmplitude of the mold without interference
- H2 H 2
- Amplitude der Kokille nach StörungAmplitude of the mold after a fault
- h1 h 1
- Amplitude des Stranges ohne StörungAmplitude of the line without interference
- h2 h 2
- Amplitude der Kokille nach StörungAmplitude of the mold after a fault
- CC
- Oszillogramm für normale KokillenbewegungOscillogram for normal mold movement
- DD
- Oszillogramm für normale GußstrangbewegungOscillogram for normal casting movement
- C1 C 1
- Oszillogramm für auffällige KokillenbewegungOscillogram for eye-catching mold movement
- D1 D 1
- Oszillogramm für auffällige GußstrangbewegungOscillogram for conspicuous casting movement
- C-DCD
- Kriterium für normales Schmierverhalten bzw. normalen TeilkraftschlußCriterion for normal lubrication behavior or normal partial adhesion
- C1 - D1 C 1 - D 1
- Kriterium für DurchbruchfrüherkennungBreakthrough early detection criterion
Claims (11)
- Method of early fissure recognition in the continuous casting of steel with an oscillating chill mould (1) constructed with copper plates, by continuous and comparative measurement of operating parameters, wherein for increase in the probability of a timely assessment of indications of an acute tendency to fissuring two items of measurement data to be compared are coupled not only with one another but also with measurement data of at least a third series of measurements and analysed on-line, characterised in that the temperature distribution in the copper plates in terms of time and position is measured and the obtained measurement data are analysed and that as third measurement series the frictional partial force couple, which is dependent on the effectiveness of the lubrication, between chill mould and cast strip (6) below the chill mould (1) is measured by comparative measurement of the chill mould oscillation and the strip oscillation and the measurement data are coupled together with the measurement data from the temperature distribution as well as with the travel/time behaviour of the chill mould and the result is computer-analysed.
- Method according to claim 1, characterised in that comparative measurements of chill mould oscillation and strip oscillation are carried out at different peripheral regions of chill mould and strip.
- Method according to claim 1 or 2, characterised in that disturbances, which occur at different peripheral regions of the chill mould or the strip, in the uniformity of the friction are localised by comparative measurements over the strip periphery or the strip width.
- Method according to one or more of claims 1 to 3, characterised in that the chill mould oscillation and strip oscillation to be compared therewith are preferably measured at the four corner points of the chill mould and continuously compared and in that case disturbances are recognised by means of analysis of the obtained measurement data in an electronic evaluating system and compared with predetermined, fissure-relevant signals and, in the case of recognisable tendency to fissuring, measures for prevention of a fissure are initiated.
- Method according to one or more of claims 1 to 4, characterised in that the temperature difference measurement of the chill mould cooling water between inlet and outlet per chill mould plate (2, 2.1; 3, 3.1) is undertaken not only integrally but also partially and integrally for each chill mould wide side (2; 2.1).
- Method according to one or more of claims 1 to 5, characterised in that as measures for prevention of fissuring preferably a reduction in the casting speed and/or a change in feed quantity or composition of the lubricant is or are undertaken.
- Method according to one or more of claims 1 to 6, characterised in that observation of the strip oscillation is carried out with use of a line camera.
- Device for early fissure recognition in the continuous casting of steel with a plate chill mould (1) which is constructed with copper plates (2, 3) and is excitable by an oscillation exciter (5) into oscillating oscillations, particularly for carrying out the method according to at least one of the preceding claims, wherein this has measuring and evaluating equipment and comprises the following features:at least one accelerometer (10.1 to 10.4) for the oscillation,a number of thermoelements (11) in the chill mould plates,a line camera (12) for recognition of the strip oscillation,a speed meter (13) for strip casting speed,an electronic evaluations system (20) for the oscillation acceleration,an electronic evaluating system (21) for temperature measurements in the chill mould plates,an electronic evaluating system (22) for the strip oscillation,a central evaluating computer unit (30) andan early-warning signal transmitter (31).
- Device according to claim 8, characterised in that the measuring and evaluating equipment additionally comprises thermoelements (16) for the temperature difference measurement (a-z) over the chill mould wide side (2, 2.1).
- Device according to claim 8 or 9, characterised in that the early-warning signal transmitter (31) is connected with setting elements (100) preferably for controlled lowering of the casting speed in targeted manner.
- Device according to claims 8 to 10, characterised in that a time switch is arranged in the connection of early-warning signal transmitter and the setting elements (100).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19725433A DE19725433C1 (en) | 1997-06-16 | 1997-06-16 | Method and device for early breakthrough detection in the continuous casting of steel with an oscillating mold |
| DE19725433 | 1997-06-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0885675A1 EP0885675A1 (en) | 1998-12-23 |
| EP0885675B1 true EP0885675B1 (en) | 2002-10-30 |
Family
ID=7832636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98110735A Expired - Lifetime EP0885675B1 (en) | 1997-06-16 | 1998-06-12 | Method and apparatus for forseeing a break-out during continuous casting of steel with an oscillating mould |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6179041B1 (en) |
| EP (1) | EP0885675B1 (en) |
| JP (1) | JPH1177264A (en) |
| KR (1) | KR19990006983A (en) |
| AT (1) | ATE226860T1 (en) |
| DE (2) | DE19725433C1 (en) |
| DK (1) | DK0885675T3 (en) |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2301829C (en) * | 1998-07-21 | 2008-07-08 | Dofasco Inc. | Multivariate statistical model-based system for monitoring the operation of a continuous caster and detecting the onset of impending breakouts |
| DE19843033B4 (en) * | 1998-09-19 | 2017-11-09 | Sms Group Gmbh | Breakthrough detection method for a continuous casting mold |
| WO2000051762A1 (en) * | 1999-03-02 | 2000-09-08 | Nkk Corporation | Method and device for predication and control of molten steel flow pattern in continuous casting |
| DE19915269A1 (en) * | 1999-04-03 | 2000-10-26 | Sms Demag Ag | Procedure for determining the friction between the continuous shell and the mold during continuous casting |
| DE10027324C2 (en) * | 1999-06-07 | 2003-04-10 | Sms Demag Ag | Process for casting a metallic strand and system therefor |
| DE50009703D1 (en) * | 1999-07-06 | 2005-04-14 | Sms Demag Ag | Method for melt management in a continuous casting machine |
| ATE299766T1 (en) * | 2000-04-25 | 2005-08-15 | Sms Demag Ag | METHOD AND DEVICE FOR THERMAL CONTROL OF A CONTINUOUS CASTING MOLD |
| DE10108730C2 (en) * | 2001-02-23 | 2003-01-30 | Thyssenkrupp Stahl Ag | Device and a method for recognizing the danger of a breakdown of the steel strand during the continuous casting of steel |
| KR20030037339A (en) * | 2001-11-01 | 2003-05-14 | 주식회사 포스코 | Monitoring apparatus of continuous casting mold |
| KR100488758B1 (en) * | 2001-12-22 | 2005-05-11 | 주식회사 포스코 | Diagnostic device and method for mold oscillation in a continuous slab casting machine |
| CA2414167A1 (en) * | 2002-12-12 | 2004-06-12 | Dofasco Inc. | Method and online system for monitoring continuous caster start-up operation and predicting start cast breakouts |
| 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 |
| US6885907B1 (en) | 2004-05-27 | 2005-04-26 | Dofasco Inc. | Real-time system and method of monitoring transient operations in continuous casting process for breakout prevention |
| DE102008028481B4 (en) * | 2008-06-13 | 2022-12-08 | Sms Group Gmbh | Method for predicting the formation of longitudinal cracks in continuous casting |
| CN101642801B (en) * | 2008-08-07 | 2011-08-24 | 上海重矿连铸技术工程有限公司 | Method for oscillating continuous casting mold |
| JP6699631B2 (en) * | 2017-07-04 | 2020-05-27 | Ｊｆｅスチール株式会社 | Mold vibration monitoring method and breakout monitoring method |
| CN110523941B (en) * | 2019-08-06 | 2023-03-17 | 中冶南方连铸技术工程有限责任公司 | Continuous casting bonding bleed-out multistage risk control method and control device |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5647245A (en) * | 1979-09-25 | 1981-04-28 | Nippon Kokan Kk <Nkk> | Continuous casting method |
| JPS5732866A (en) | 1980-08-05 | 1982-02-22 | Kawasaki Steel Corp | Method and device for foreseeing breakout in continuous casting |
| JPS57124563A (en) | 1981-01-28 | 1982-08-03 | Nippon Steel Corp | Control device for continuous casting |
| JPS57190760A (en) | 1981-05-18 | 1982-11-24 | Mitsubishi Heavy Ind Ltd | Foreseeing method for breakout |
| JPS59125248A (en) * | 1983-01-05 | 1984-07-19 | Kawasaki Steel Corp | Method for controlling lubrication of casting mold in continuous casting |
| US4532975A (en) * | 1983-04-28 | 1985-08-06 | United States Steel Corporation | Continuous casting mold oscillator load indication system |
| JPS61501501A (en) * | 1984-03-19 | 1986-07-24 | エイエムビイ・テクノロジイ・インク | Continuous metal casting method and device |
| AU562731B2 (en) * | 1985-02-01 | 1987-06-18 | Nippon Steel Corporation | Preventtion of casting defects in continuous casting |
| JPS61279350A (en) * | 1985-06-05 | 1986-12-10 | Kawasaki Steel Corp | Method for controlling continuous casting of steel |
| JPS6418553A (en) | 1987-07-13 | 1989-01-23 | Kawasaki Steel Co | Instrument for detecting friction force between mold and cast slab in continuous casting apparatus |
| US4949777A (en) * | 1987-10-02 | 1990-08-21 | Kawasaki Steel Corp. | Process of and apparatus for continuous casting with detection of possibility of break out |
| DE3806583A1 (en) * | 1988-02-26 | 1989-09-07 | Mannesmann Ag | METHOD IN A CASTING SYSTEM FOR PRODUCING STRINGS |
| US5020585A (en) * | 1989-03-20 | 1991-06-04 | Inland Steel Company | Break-out detection in continuous casting |
| DE4117073A1 (en) * | 1991-05-22 | 1992-11-26 | Mannesmann Ag | TEMPERATURE MEASUREMENT SLAM CHOCOLATE |
| DE4442087C2 (en) * | 1994-11-25 | 2003-07-03 | Siemens Ag | Device for early breakthrough detection in continuous casting |
| DE19529931C1 (en) * | 1995-08-02 | 1997-04-03 | Mannesmann Ag | Plate mold for the production of steel strands |
-
1997
- 1997-06-16 DE DE19725433A patent/DE19725433C1/en not_active Expired - Fee Related
-
1998
- 1998-06-10 JP JP10162408A patent/JPH1177264A/en not_active Withdrawn
- 1998-06-10 US US09/095,274 patent/US6179041B1/en not_active Expired - Fee Related
- 1998-06-12 DK DK98110735T patent/DK0885675T3/en active
- 1998-06-12 DE DE59806092T patent/DE59806092D1/en not_active Expired - Fee Related
- 1998-06-12 EP EP98110735A patent/EP0885675B1/en not_active Expired - Lifetime
- 1998-06-12 AT AT98110735T patent/ATE226860T1/en not_active IP Right Cessation
- 1998-06-15 KR KR1019980022280A patent/KR19990006983A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| US6179041B1 (en) | 2001-01-30 |
| JPH1177264A (en) | 1999-03-23 |
| DK0885675T3 (en) | 2002-11-25 |
| DE59806092D1 (en) | 2002-12-05 |
| EP0885675A1 (en) | 1998-12-23 |
| ATE226860T1 (en) | 2002-11-15 |
| KR19990006983A (en) | 1999-01-25 |
| DE19725433C1 (en) | 1999-01-21 |
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