EP1103322A1 - Process for continuous casting slabs, especially thin slabs, and device for carrying out the process - Google Patents
Process for continuous casting slabs, especially thin slabs, and device for carrying out the process Download PDFInfo
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- EP1103322A1 EP1103322A1 EP00123615A EP00123615A EP1103322A1 EP 1103322 A1 EP1103322 A1 EP 1103322A1 EP 00123615 A EP00123615 A EP 00123615A EP 00123615 A EP00123615 A EP 00123615A EP 1103322 A1 EP1103322 A1 EP 1103322A1
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- Prior art keywords
- mold
- temperature
- heat flow
- casting
- slabs
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009749 continuous casting Methods 0.000 title claims description 10
- 238000005266 casting Methods 0.000 claims abstract description 16
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 230000005499 meniscus Effects 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 239000000155 melt Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 230000004907 flux Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 229910052802 copper Inorganic materials 0.000 description 6
- 239000010949 copper Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 238000001595 flow curve Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- 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
- B22D11/165—Controlling or regulating processes or operations for the supply of casting powder
-
- 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
- B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
Definitions
- the invention relates to a method for the continuous casting of blocks, billets, Slabs, especially thin slabs, in the size range of about 20 up to 150 mm thick and about 600 mm to 3500 mm wide, by means of an oscillatable, water-cooled mold in cooperation with a diving spout underneath Use of casting powder to form casting slag.
- the invention also relates a device for performing the method.
- DE 198 10 672 A1 describes a method for measuring and regulating Temperature and amount of water-coolable per unit time, especially from each other Independent mold walls made of cooling water flowing through copper plates a continuous casting mold.
- the invention is that the cooling water temperature a mold wall in at least two places in the area of the drain openings a copper plate and the associated water tank is measured and a temperature profile from the values measured across the width of the copper plate is created and temperature profiles obtained in time intervals with each other be compared.
- the inlet temperature of the cooling water is measured the difference between the inlet and outlet temperature is determined and from the Amount of cooling water per unit of time the partial integral heat dissipation from one Mold wall or determined from a mold belt area and partial inequalities compensate by making partial corrections to the cooling water.
- the liquid-cooled mold for performing the method is designed so that in the water drainage area between a copper plate and the cooling water drain opening of the water tank, in particular at least per broad side plate Two points are arranged temperature sensors and their signal lines to one Computer, preferably connected to an online screen.
- the object of the invention based on a method and a device for the continuous casting of blocks, Billets, slabs, especially thin slabs, specify which are suitable are local temperatures and / or heat flux densities along the altitude of mold walls and in several places along their broad sides and from this the temperature load in contact with the melt located mold wall preferably in the meniscus area.
- Means The measured values should include operating parameters such as the amount of cooling water and the casting speed and mold powder are controlled so that at a preferred working temperature the mold walls in the meniscus area an optimal surface formation the slabs with the longest possible availability of the mold becomes.
- thermocouples are each arranged at different depths (X 1 , X 2 ) of the mold wall, and that from the temperature difference at least two in approximately the same height range (Yi, e.g. y 1 , y 2 ) local thermocouples the associated local heat flow density is calculated.
- an embodiment of the method according to the invention provides that by determining the temperature or heat flow curve over the height of a The mold wall uses approximation functions to determine the maximum temperature profile the wall area in contact with the melt is calculated.
- a further embodiment of the method provides that when a Heat flow density change in the mold height (y) due to two-dimensional Heat spread in the area of the bathroom mirror (M) by assuming a heat flow density curve on a mold surface and with knowledge of the heat flow density in the depth (x) of a mold wall the position of the bath level (M) is determined online.
- a detection device provided for carrying out the method of local temperatures and / or heat flow densities on a water-cooled Mold in the continuous casting of blocks, billets, slabs, in particular of thin slabs, according to the invention is that in the broad side walls the mold in an area above and below the bathroom mirror as well as in each approximately equal distances from their contact surface with the molten metal Thermocouples are inserted in pairs, via signal lines are connected to a computing unit, which according to the determined Temperature or heat flow density is the surface temperature of the mold calculated in the meniscus area and which to control a preferred one Working temperature of the mold wall within a given temperature range ( ⁇ T) the operating parameters of cooling water quantity, pouring speed and Mold powder adjusts ..
- FIG. 1 shows a temperature profile or a heat flow curve over the height (y) of a mold wall and in at least two spacing areas (x 1 , x 2 ) of the mold wall from the molten bath (M).
- the course of the strongly drawn curve (y 1 , y 3 , Y 5 , Y 7 , Y 9 , Y 11 ) shows a pronounced temperature maximum (T max ) in the range of a predetermined temperature range ( ⁇ T).
- the measuring points located further inside the mold wall (y 2 , y 4 , y 6 , y 8, y 10 , y 12 ) show a similar curve with a maximum temperature (T max ) in the meniscus area (M).
- the temperature profile of the mold surface is calculated from the measured temperature profiles.
- the temperature curves can be measured in an electronic measuring device Display can be recorded online and made visible. You can use it for this the temperature in the specified temperature window ( ⁇ T) to keep the automatic control of the decisive operating parameters constant, to achieve an optimal surface formation, for example with a thin slab.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zum Stranggießen von Blöcken, Knüppeln, Brammen, insbesondere von Dünnbrammen, im Abmessungsbereich von etwa 20 bis 150 mm Dicke und etwa 600 mm bis 3500 mm Breite, mittels einer oszillierbaren, wasserkühlbaren Kokille im Zusammenwirken mit einem Tauchausguss unter Einsatz von Gießpulver zur Bildung von Gießschlacke. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for the continuous casting of blocks, billets, Slabs, especially thin slabs, in the size range of about 20 up to 150 mm thick and about 600 mm to 3500 mm wide, by means of an oscillatable, water-cooled mold in cooperation with a diving spout underneath Use of casting powder to form casting slag. The invention also relates a device for performing the method.
Verfahren und Vorrichtungen zum Stranggießen, insbesondere von Dünnbrammen, sind bekannt und wurden im Laufe der zurückliegenden Entwicklungsperioden stetig verbessert.Processes and devices for continuous casting, especially thin slabs, are known and have been developed in the past steadily improved.
Es ist bspw. bekannt, daß infolge sehr unterschiedlicher Wärmeleitfähigkeiten der am Stranggießen beteiligten unterschiedlichen Medien und der daraus resultierenden Widerstände gegen Wärmeleitung und Wärmeübergänge die Bildung einer im Entstehen begriffenen Strangschale eines Gussstranges und speziell deren Oberflächenbeschaffenheit in relativ weiten Grenzen veränderlich ist. Insbesondere spielt beim Wärmekontakt zwischen Schmelzbad und Kokillenwand die Dicke der flüssigen Schlacke aus geschmolzenem Gießpulver wegen deren spezifisch extrem geringen Leitfähigkeit mit ca. 1 W/K x m eine wesentliche Rolle, weil sie dem Wärmeübergang zwischen Schmelze und Kokillenplatten einen erheblichen Widerstand entgegensetzt. Im Gegensatz zur flüssigen Schlacke besitzt Kupfer eine extrem hohe Wärmeleitfähigkeit mit ca. 360 W/K x m.It is known, for example, that due to very different thermal conductivities different media involved in continuous casting and the resulting media Resistance to heat conduction and heat transfer the formation of a nascent strand shell of a cast strand and especially its Surface quality is variable within relatively wide limits. In particular the thickness plays in the thermal contact between the melt pool and the mold wall the liquid slag from molten mold powder because of its specific extremely low conductivity with approx. 1 W / K x m play an essential role because of it the heat transfer between the melt and mold plates is considerable Opposed resistance. In contrast to liquid slag, copper has an extremely high thermal conductivity with approx. 360 W / K x m.
Durch die unterschiedlichen Einzelwiderstände der Wärmeleitfähigkeit zwischen Kupfer, Schlacke und Stahl ergeben sich innerhalb der Kokillenplatten unterschiedliche Wärmestromdichten, die einen erheblichen Einfluss auf das Erstarrungsverhalten eines zu gießenden Stranges ausüben.Due to the different individual resistances of the thermal conductivity between Copper, slag and steel are different within the mold plates Heat flux densities that have a significant impact on solidification behavior of a strand to be cast.
Der in diesem Zusammenhang veröffentlichte Stand der Technik ist bspw. in den Dokumenten DE 41 17 073 C2, DE 195 29 931 A1 sowie DE 198 10 672 A1 beschrieben.The prior art published in this connection is, for example, in the Documents DE 41 17 073 C2, DE 195 29 931 A1 and DE 198 10 672 A1 are described.
In DE 41 17 073 C2 werden die Temperaturaufnahmen von vier wassergekühlten Kokillenplatten als integrale Werte jeder einzelnen Platte gemessen und ausgewertet. Es werden keine partiellen Meßwerte über die Kokillenbreite erfasst und prinzipiell auch keine Wassermenge zur Kühlung verändert.In DE 41 17 073 C2 the temperature recordings of four water-cooled Mold plates measured and evaluated as integral values of each individual plate. No partial measured values are recorded across the mold width and in principle, no amount of water changed for cooling.
In DE 195 29 931 A1 wird eine Brammenkokille beschrieben, die aus mindestens drei voneinander unabhängigen Kühlkammersegmenten besteht, die im Bereich des Kokillenausgangs gesonderte Anschlüsse zur unabhängigen Zufuhr von Kokillenkühlwasser aufweisen. Mit dieser Anordnung sollen Unsymmetrien der spezifischen Wärmeströme zwischen dem Bereich Tauchausguss und den restlichen Kokillenbereichen erkannt werden und durch Konizitätsverstellung der Schmalseiten der Kokille und Kühlwasserregelung ausgeglichen werden.DE 195 29 931 A1 describes a slab mold which consists of at least there are three independent cooling chamber segments in the area of the mold outlet, separate connections for the independent supply of mold cooling water exhibit. With this arrangement, asymmetries of the specific Heat flows between the immersion area and the rest Mold areas are recognized and by conicity adjustment of the narrow sides the mold and cooling water regulation are balanced.
Die DE 198 10 672 A1 beschreibt ein Verfahren zum Messen und Regeln von Temperatur und Menge des pro Zeiteinheit wasserkühlbare, insbesondere voneinander unabhängige Kokillenwände aus Kupferplatten durchströmenden Kühlwassers einer Stranggießkokille. Die Erfindung besteht darin, daß die Kühlwassertemperatur einer Kokillenwand an wenigstens zwei Stellen im Bereich der Ablauföffnungen einer Kupferplatte und dem zugeordneten Wasserkasten gemessen wird und aus den über die Breite der Kupferplatte gemessenen Werten ein Temperaturprofil erstellt wird und in Zeitintervallen gewonnenen Temperaturprofile miteinander verglichen werden. Dabei wird die Zulauftemperatur des Kühlwassers gemessen, die Differenz aus Zulauf- und Ablauftemperatur ermittelt und aus der Kühlwassermenge pro Zeiteinheit die partielle integrale Wärmeabfuhr aus einer Kokillenwand bzw. aus einem Kokillenbandbereich ermittelt und partielle Ungleichheiten durch partielle Mengenkorrekturen des Kühlwassers ausglichen. Die flüssigkeitsgekühlte Kokille zur Durchführung des Verfahrens ist so gestaltet, daß im Wasserablaufbereich zwischen einer Kupferplatte und der Kühlwasserablauföffnung des Wasserkastens insbesondere pro Breitseitenplatte mindestens an zwei Stellen Temperaturfühler angeordnet sind und deren Signalleitungen an einen Rechner, bevorzugt mit einem Online-Bildschirm angeschlossen sind.DE 198 10 672 A1 describes a method for measuring and regulating Temperature and amount of water-coolable per unit time, especially from each other Independent mold walls made of cooling water flowing through copper plates a continuous casting mold. The invention is that the cooling water temperature a mold wall in at least two places in the area of the drain openings a copper plate and the associated water tank is measured and a temperature profile from the values measured across the width of the copper plate is created and temperature profiles obtained in time intervals with each other be compared. The inlet temperature of the cooling water is measured the difference between the inlet and outlet temperature is determined and from the Amount of cooling water per unit of time the partial integral heat dissipation from one Mold wall or determined from a mold belt area and partial inequalities compensate by making partial corrections to the cooling water. The liquid-cooled mold for performing the method is designed so that in the water drainage area between a copper plate and the cooling water drain opening of the water tank, in particular at least per broad side plate Two points are arranged temperature sensors and their signal lines to one Computer, preferably connected to an online screen.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde ein Verfahren und eine Vorrichtung zum Stranggießen von Blöcken, Knüppeln, Brammen, insbesondere von Dünnbrammen, anzugeben, welche geeignet sind, lokale Temperaturen und/oder Wärmestromdichten entlang der Höhe von Kokillenwänden und an mehreren Stellen ihrer Breitseitenerstreckung zu erfassen und daraus die Temperatur-Belastung der im Kontakt mit der Schmelze befindlichen Kokillenwand bevorzugt im Meniskusbereich zu berechnen. Mittels der Meßwerte sollen Betriebsparameter wie Kühlwassermenge, Gießgeschwindigkeit und Gießpulver so gesteuert werden, daß bei einer bevorzugten Arbeitstemperatur der Kokillenwände im Meniskusbereich eine optimale Oberflächen-Ausbildung der Brammen bei möglichst langer Verfügbarkeit der Kokille ermöglicht wird. Starting from the aforementioned prior art, the object of the invention based on a method and a device for the continuous casting of blocks, Billets, slabs, especially thin slabs, specify which are suitable are local temperatures and / or heat flux densities along the altitude of mold walls and in several places along their broad sides and from this the temperature load in contact with the melt located mold wall preferably in the meniscus area. Means The measured values should include operating parameters such as the amount of cooling water and the casting speed and mold powder are controlled so that at a preferred working temperature the mold walls in the meniscus area an optimal surface formation the slabs with the longest possible availability of the mold becomes.
Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 bezeichneten Art mit der Erfindung vorgeschlagen, daß die lokalen Temperaturen und Wärmestromdichten im für die Oberflächenqualität einer Bramme kritischen Meniskusbereich erfasst und daß die Arbeitstemperaturen der Kokillenplatten im Meniskusbereich durch Anpassung der hierfür maßgebenden Betriebsparameter: wie Menge bzw. Durchlaufgeschwindigkeit des Kühlwasser durch die Kokille, Gießgeschwindigkeit,zu verwendendes Gießpulver, in einem vorgegebenen Temperaturbereich (Δ T) gehalten werden.To solve the problem is in a method in the preamble of claim 1 designated type with the invention proposed that the local temperatures and heat flow densities for the surface quality of a slab critical meniscus area and recorded that the working temperatures of the mold plates in the meniscus area by adjusting the relevant operating parameters: such as the amount or flow rate of the cooling water through the Mold, casting speed, mold powder to be used, in a given Temperature range (Δ T) are kept.
Dadurch werden Temperaturverläufe über die Höhe der Kokillenplatten erfasst und durch deren Verlauf werden die Maximaltemperaturen und damit die Lage des Meniskusbereiches der Schmelze in der Kokille erfasst. Mit Kenntnis der optimalen Wärmestromdichte ist es möglich, die Oberflächenqualität von im Strangguß erzeugten Produkten, insbesondere von Dünnbrammen zu verbessern.As a result, temperature profiles over the height of the mold plates are recorded and the course of the maximum temperatures and thus the location of the Meniscus area of the melt in the mold. With knowledge of the optimal Heat flow density, it is possible to improve the surface quality of the continuous casting produce products, especially thin slabs.
Eine Ausgestaltung des Verfahrens sieht vor, daß Arbeitstemperaturen der Kokillenplatten durch in jeweils einem Höhenbereich (Yi, i = 1 bis n) über- und unter dem Badspiegel (M) in definierten Abständen angeordnete Thermoelemente erfasst werden.An embodiment of the method provides that working temperatures of the mold plates by over and under in a height range (Yi, i = 1 to n) the bath level (M) detects thermocouples arranged at defined intervals become.
Eine weitere Ausgestaltung des Verfahrens nach der Erfindung sieht vor, daß Thermoelemente jeweils in unterschiedlichen Tiefen (X1, X2) der Kokillenwand angeordnet werden, und dass aus der Temperaturdifferenz wenigstens zweier in annähemd gleichem Höhenbereich (Yi, bspw. y1, y2) gelegener Thermoelemente die zugehörige lokale Wärmestromdichte errechnet wird.A further embodiment of the method according to the invention provides that thermocouples are each arranged at different depths (X 1 , X 2 ) of the mold wall, and that from the temperature difference at least two in approximately the same height range (Yi, e.g. y 1 , y 2 ) local thermocouples the associated local heat flow density is calculated.
Die hierbei gewonnenen Erkenntnisse über den Verlauf der Wärmestromdichte machen es möglich, Abweichungen von einem vorgegebenen Verlauf mit den hierfür vorgesehenen Betriebsparametern online zu korrigieren. The knowledge gained here about the course of the heat flow density make it possible to deviate from a given course with the correct the intended operating parameters online.
Weiterhin sieht eine Ausgestaltung des erfindungsgemäßen Verfahrens vor, daß durch Ermittlung des Temperatur- bzw. Wärmestromverlaufs über die Höhe einer Kokillenwand mittels Näherungsfunktionen der maximale Temperaturverlauf an der im Kontakt mit der Schmelze befindlichen Wandfläche berechnet wird. Dabei sieht eine weitere Ausgestaltung des Verfahrens vor, daß bei Erfassung einer Wärmestromdichte-Änderung in der Kokillenhöhe (y) infolge zweidimensionaler Wärmeausbreitung im Badspiegelbereich (M) durch Annahme eines Wärmestromdichteverlaufs an einer Kokillenoberfläche und mit Kenntnis der Wärmestromdichte in der Tiefe (x) einer Kokillenwand die Lage des Badspiegels (M) online ermittelt wird.Furthermore, an embodiment of the method according to the invention provides that by determining the temperature or heat flow curve over the height of a The mold wall uses approximation functions to determine the maximum temperature profile the wall area in contact with the melt is calculated. there A further embodiment of the method provides that when a Heat flow density change in the mold height (y) due to two-dimensional Heat spread in the area of the bathroom mirror (M) by assuming a heat flow density curve on a mold surface and with knowledge of the heat flow density in the depth (x) of a mold wall the position of the bath level (M) is determined online.
Und schließlich sieht eine weitere Ausgestaltung des Verfahrens nach der Erfindung vor, daß bei Kenntnis der optimalen Wärmestromdichte oder der maximalen Oberflächentemperatur der Kokille die für eine optimale Brammenoberflächenausbildung bestgeeignete Kokillen-Wärmebelastung durch Einstellen von Kühlwassermenge und/oder von Gießgeschwindigkeit und/oder des Gießpulvers angesteuert wird.And finally see a further embodiment of the method according to the invention before that with knowledge of the optimal heat flow density or the maximum Surface temperature of the mold for optimal slab surface formation Most suitable mold heat load by adjusting the amount of cooling water and / or controlled by the casting speed and / or the casting powder becomes.
Eine zur Durchführung des Verfahrens vorgesehene Vorrichtung zur Erfassung von lokalen Temperaturen und/oder Wärmestromdichten an einer wassergekühlten Kokille beim Stranggießen von Blöcken, Knüppeln, Brammen, insbesondere von Dünnbrammen, besteht erfindungsgemäß darin, daß in den Breitseitenwänden der Kokille in einem Bereich über und unter dem Badspiegel sowie in jeweils etwa gleichen Abständen von deren Kontaktfläche mit dem schmelzflüssigen Metall in paarweiser Anordnung Thermoelemente eingelassen sind, die über Signalleitungen mit einer Recheneinheit verbunden sind, welche nach Maßgabe der ermittelten Temperatur bzw. Wärmestromdichte die Oberflächentemperatur der Kokille im Meniskusbereich errechnet und welche zur Steuerung einer bevorzugten Arbeitstemperatur der Kokillenwand innerhalb eines vorgegebenen Temperaturbereichs (Δ T) die Betriebsparameter Kühlwassermenge, Gießgeschwindigkeit sowie Gießpulver anpaßt..A detection device provided for carrying out the method of local temperatures and / or heat flow densities on a water-cooled Mold in the continuous casting of blocks, billets, slabs, in particular of thin slabs, according to the invention is that in the broad side walls the mold in an area above and below the bathroom mirror as well as in each approximately equal distances from their contact surface with the molten metal Thermocouples are inserted in pairs, via signal lines are connected to a computing unit, which according to the determined Temperature or heat flow density is the surface temperature of the mold calculated in the meniscus area and which to control a preferred one Working temperature of the mold wall within a given temperature range (Δ T) the operating parameters of cooling water quantity, pouring speed and Mold powder adjusts ..
Die beigefügte Figur 1 zeigt ein Temperaturprofil bzw. einen Wärmestromverlauf über die Höhe (y) einer Kokillenwand sowie in wenigstens zwei Abstandsbereichen (x1, x2) der Kokillenwand vom Schmelzbad (M). Der Verlauf der stark ausgezogenen Kurve (y1, y3, Y5, Y7, Y9, Y11) zeigt ein ausgesprochenes Temperaturmaximum (Tmax) im Bereich eines vorgegebenen Temperaturbereichs (Δ T). Die weiter im inneren der Kokillenwand gelegenen Messpunkte (y2, y4, y6, y8. y10, y12) zeigen einen ähnlichen Kurvenverlauf mit Temperaturmaximum (Tmax) im Meniskusbereich (M). Aus den gemessenen Temperaturprofilen wird das Temperaturprofil der Kokillenoberfläche berechnet.The attached FIG. 1 shows a temperature profile or a heat flow curve over the height (y) of a mold wall and in at least two spacing areas (x 1 , x 2 ) of the mold wall from the molten bath (M). The course of the strongly drawn curve (y 1 , y 3 , Y 5 , Y 7 , Y 9 , Y 11 ) shows a pronounced temperature maximum (T max ) in the range of a predetermined temperature range (Δ T). The measuring points located further inside the mold wall (y 2 , y 4 , y 6 , y 8, y 10 , y 12 ) show a similar curve with a maximum temperature (T max ) in the meniscus area (M). The temperature profile of the mold surface is calculated from the measured temperature profiles.
Die Temperaturkurven können über eine elektronische Messeinrichtung in einem Display online aufgezeichnet und sichtbar gemacht werden. Sie können dazu verwendet werden, die Temperatur im vorgegebenen Temperaturfenster (Δ T) durch selbsttätige Regelung der maßgebenden Betriebsparameter konstant zu halten, um eine optimale Oberflächenausbildung bspw. bei einer Dünnbramme zu erzielen.The temperature curves can be measured in an electronic measuring device Display can be recorded online and made visible. You can use it for this the temperature in the specified temperature window (Δ T) to keep the automatic control of the decisive operating parameters constant, to achieve an optimal surface formation, for example with a thin slab.
Claims (7)
dadurch gekennzeichnet,
characterized,
dadurch gekennzeichnet,
daß Arbeitstemperaturen der Kokillenplatten durch in jeweils einem Höhenbereich (Yi) (i = 1 bis n) über- und unter dem Badspiegel (M) in definierten Abständen angeordnete Thermoelemente erfasst werden. Method according to claim 1,
characterized,
that working temperatures of the mold plates are detected by thermocouples arranged in a height range (Yi) (i = 1 to n) above and below the bath level (M) at defined intervals.
dadurch gekennzeichnet,
dass Thermoelemente jeweils in unterschiedlichen Tiefen (X1, X2) der Kokillenwand angeordnet werden, und dass aus der Temperaturdifferenz wenigstens zweier in annähernd gleichem Höhenbereich (Yi) gelegener Thermoelemente die zugehörige lokale Wärmestromdichte errechnet wird.Method according to one of claims 1 or 2,
characterized,
that thermocouples are each arranged at different depths (X 1 , X 2 ) of the mold wall, and that the associated local heat flow density is calculated from the temperature difference of at least two thermocouples located in approximately the same height range (Yi).
dadurch gekennzeichnet,
dass durch Ermittlung des Temperatur- bzw. Wärmestromverlaufs über die Höhe einer Kokillenwand mittels Näherungsfunktionen der maximale Temperaturverlauf an der im Kontakt mit der Schmelze befindlichen Wandfläche berechnet wird.Method according to one or more of claims 1 to 3,
characterized,
that the maximum temperature profile on the wall surface in contact with the melt is calculated by determining the temperature or heat flow profile over the height of a mold wall by means of approximation functions.
dadurch gekennzeichnet,
dass bei Erfassung einer Wärmestromdichte-Änderung in der Kokillenhöhe (y) infolge zweidimensionaler Wärmeausbreitung im Badspiegelbereich (M) durch Annahme eines Wärmestromdichteverlaufs an einer Kokillenoberfläche und mit Kenntnis der Wärmestromdichte in der Tiefe (x) einer Kokillenwand die Lage des Badspiegels (M) ermittelt wird.Method according to one or more of claims 1 to 4,
characterized,
that when detecting a change in heat flux density in the mold height (y) as a result of two-dimensional heat propagation in the bath level area (M), the position of the bath level (M) is determined by assuming a heat flow density profile on a mold surface and knowing the heat flow density in the depth (x) of a mold wall .
dadurch gekennzeichnet,
dass bei Kenntnis der optimalen Wärmestromdichte oder der maximalen Oberflächentemperatur die für eine optimale Brammenoberflächenausbildung bestgeeignete Kokillenbelastung durch Einstellen von Kühlwassermenge und/oder von Gießgeschwindigkeit und/oder des Gießpulvers angesteuert wird. Method according to one or more of claims 1 to 5,
characterized,
that with knowledge of the optimal heat flow density or the maximum surface temperature, the mold load that is best suited for optimal slab surface formation is controlled by adjusting the amount of cooling water and / or the casting speed and / or the casting powder.
dadurch gekennzeichnet,
dass in den Breitseitenwänden der Kokille in einem Bereich über und unter dem Badspiegel (M) sowie in jeweils etwa gleichen Abständen von deren Kontaktfläche mit dem schmelzflüssigen Metall in paarweiser Anordnung Thermoelemente (ym, Yn) eingelassen sind, die über Signalleitungen mit einer Recheneinheit verbunden sind, welche nach Maßgabe der ermittelten Temperatur bzw. Wärmestromdichte die Oberflächentemperatur der Kokille im Meniskusbereich (M) errechnet und welche zur Steuerung einer bevorzugten Arbeitstemperatur der Kokillenwand innerhalb eines vorgegebenen Temperaturbereichs (Δ T) die Betriebsparameter Kühlwassermenge, Gießgeschwindigkeit sowie Gießpulver anpaßt.Device for recording local temperatures and / or heat flow densities on a water-cooled mold during the continuous casting of blocks, billets, slabs, in particular thin slabs, for the purpose of carrying out the method according to the invention,
characterized,
that thermocouples (y m , Y n ) are inserted in pairs in the broad side walls of the mold in an area above and below the bath level (M) and at roughly equal distances from their contact surface with the molten metal, which are connected via signal lines to a computing unit are connected, which calculates the surface temperature of the mold in the meniscus area (M) in accordance with the determined temperature or heat flow density and which adjusts the operating parameters of cooling water quantity, casting speed and casting powder to control a preferred working temperature of the mold wall within a predetermined temperature range (Δ T).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19956577 | 1999-11-25 | ||
| DE19956577A DE19956577A1 (en) | 1999-11-25 | 1999-11-25 | Process for the continuous casting of slabs, in particular thin slabs, and a device for carrying them out |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1103322A1 true EP1103322A1 (en) | 2001-05-30 |
| EP1103322B1 EP1103322B1 (en) | 2005-03-30 |
Family
ID=7930201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00123615A Expired - Lifetime EP1103322B1 (en) | 1999-11-25 | 2000-10-28 | Process for continuous casting slabs, especially thin slabs, and device for carrying out the process |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6776217B1 (en) |
| EP (1) | EP1103322B1 (en) |
| JP (1) | JP2001334354A (en) |
| AT (1) | ATE291980T1 (en) |
| DE (2) | DE19956577A1 (en) |
Cited By (10)
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|---|---|---|---|---|
| WO2003028921A2 (en) * | 2001-09-28 | 2003-04-10 | Sms Demag Aktiengesellschaft | Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel |
| WO2008052689A1 (en) * | 2006-11-02 | 2008-05-08 | Sms Demag Ag | Method and control device for controlling the heat removal from a side plate of a mould |
| CN102059332A (en) * | 2009-11-12 | 2011-05-18 | 上海宝信软件股份有限公司 | System for realizing life cycle model of plate blank in basic automation |
| CN102397999A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Ladle slag thickness and clearance measurement method |
| US8162030B2 (en) | 2008-06-25 | 2012-04-24 | Sms Siemag Aktiengesellschaft | Mold for casting metal |
| CN103745095A (en) * | 2013-12-25 | 2014-04-23 | 冶金自动化研究设计院 | General informationized expressive method for continuous casting blanks |
| WO2014095137A1 (en) | 2012-12-21 | 2014-06-26 | Siemens Vai Metals Technologies Gmbh | Monitoring method for a continuous casting mould involving building up a database |
| CN104399928A (en) * | 2014-11-24 | 2015-03-11 | 南京钢铁股份有限公司 | Continuous casting production process for producing wide-section 9Ni steel slab |
| WO2016029901A1 (en) * | 2014-08-26 | 2016-03-03 | Peter Valentin | Method for extruding a metal, in particular a steel, and extrusion device |
| EP4091737A1 (en) | 2021-05-17 | 2022-11-23 | Primetals Technologies Austria GmbH | Conversion of measured temperature values of a continuous casting mould |
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| KR20040038224A (en) * | 2002-10-31 | 2004-05-08 | 주식회사 포스코 | Apparatus for detecting height of melten steel in continuous casting process |
| GB0623755D0 (en) * | 2006-11-28 | 2007-01-10 | Sarclad Ltd | Measuring system for continuous casting machines |
| DE102009060548B4 (en) | 2009-12-23 | 2020-06-04 | Vdeh-Betriebsforschungsinstitut Gmbh | Mold for a continuous caster and use of such a mold |
| CH702754A2 (en) * | 2010-02-19 | 2011-08-31 | Stopinc Ag | Monitoring device for a sliding closure, a Giessrohrwechsler or the like on a metallurgical vessel. |
| DE102011114556A1 (en) * | 2011-09-30 | 2013-04-04 | Egon Evertz Kg (Gmbh & Co.) | Copper mold or copper mold plate useful for continuous casting of metals or metal alloys, comprises a coating made of electrolytically deposited copper on mold inner wall or mold plate side, and thermocouple for measuring temperature |
| WO2016060164A1 (en) * | 2014-10-15 | 2016-04-21 | 新日鐵住金株式会社 | Device, method, and program for detecting molten-metal surface level in continuous casting mold |
| CN109789476B (en) * | 2016-05-25 | 2021-10-12 | Ald真空技术有限公司 | Method for electroslag remelting and melting vessel |
| CN105798253B (en) * | 2016-06-06 | 2017-08-04 | 重庆大学 | A kind of chilling roller of casting for shaped blank continuous two stitches method of adjustment |
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- 2000-10-28 EP EP00123615A patent/EP1103322B1/en not_active Expired - Lifetime
- 2000-10-28 AT AT00123615T patent/ATE291980T1/en active
- 2000-11-17 US US09/715,933 patent/US6776217B1/en not_active Expired - Fee Related
- 2000-11-21 JP JP2000354312A patent/JP2001334354A/en not_active Withdrawn
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003028921A2 (en) * | 2001-09-28 | 2003-04-10 | Sms Demag Aktiengesellschaft | Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel |
| WO2003028921A3 (en) * | 2001-09-28 | 2003-10-23 | Sms Demag Ag | Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel |
| WO2008052689A1 (en) * | 2006-11-02 | 2008-05-08 | Sms Demag Ag | Method and control device for controlling the heat removal from a side plate of a mould |
| US8162030B2 (en) | 2008-06-25 | 2012-04-24 | Sms Siemag Aktiengesellschaft | Mold for casting metal |
| CN102059332A (en) * | 2009-11-12 | 2011-05-18 | 上海宝信软件股份有限公司 | System for realizing life cycle model of plate blank in basic automation |
| CN102059332B (en) * | 2009-11-12 | 2014-08-20 | 上海宝信软件股份有限公司 | System for realizing life cycle model of plate blank in basic automation |
| CN102397999A (en) * | 2010-09-16 | 2012-04-04 | 鞍钢股份有限公司 | Ladle slag thickness and clearance measurement method |
| CN102397999B (en) * | 2010-09-16 | 2013-05-29 | 鞍钢股份有限公司 | Ladle slag thickness and clearance measurement method |
| WO2014095137A1 (en) | 2012-12-21 | 2014-06-26 | Siemens Vai Metals Technologies Gmbh | Monitoring method for a continuous casting mould involving building up a database |
| US10052684B2 (en) | 2012-12-21 | 2018-08-21 | Primetals Technologies Austria GmbH | Monitoring method for a continuous casting mould including building up a database |
| CN103745095A (en) * | 2013-12-25 | 2014-04-23 | 冶金自动化研究设计院 | General informationized expressive method for continuous casting blanks |
| CN103745095B (en) * | 2013-12-25 | 2016-08-17 | 冶金自动化研究设计院 | A kind of continuous casting billet general information method for expressing |
| WO2016029901A1 (en) * | 2014-08-26 | 2016-03-03 | Peter Valentin | Method for extruding a metal, in particular a steel, and extrusion device |
| CN104399928A (en) * | 2014-11-24 | 2015-03-11 | 南京钢铁股份有限公司 | Continuous casting production process for producing wide-section 9Ni steel slab |
| CN104399928B (en) * | 2014-11-24 | 2016-07-06 | 南京钢铁股份有限公司 | A kind of continuous casting manufacturing technique producing Wide Band Oxygen Sensors 9Ni steel strand |
| EP4091737A1 (en) | 2021-05-17 | 2022-11-23 | Primetals Technologies Austria GmbH | Conversion of measured temperature values of a continuous casting mould |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19956577A1 (en) | 2001-05-31 |
| ATE291980T1 (en) | 2005-04-15 |
| DE50009907D1 (en) | 2005-05-04 |
| EP1103322B1 (en) | 2005-03-30 |
| JP2001334354A (en) | 2001-12-04 |
| US6776217B1 (en) | 2004-08-17 |
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