EP1103322B1 - 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
- Publication number
- EP1103322B1 EP1103322B1 EP00123615A EP00123615A EP1103322B1 EP 1103322 B1 EP1103322 B1 EP 1103322B1 EP 00123615 A EP00123615 A EP 00123615A EP 00123615 A EP00123615 A EP 00123615A EP 1103322 B1 EP1103322 B1 EP 1103322B1
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- Prior art keywords
- casting
- casting mould
- temperature
- heat flux
- slabs
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009749 continuous casting Methods 0.000 title claims description 9
- 238000005266 casting Methods 0.000 claims abstract description 41
- 239000000498 cooling water Substances 0.000 claims abstract description 16
- 230000005499 meniscus Effects 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000002893 slag Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims 1
- 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 3
- 239000000155 melt Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009189 diving Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000001105 regulatory effect Effects 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, in particular of thin slabs, in the size range of approximately 20 up to 150 mm thick and approximately 600 to 3500 mm wide, by means of an oscillatable water-cooled mold used in conjunction with a diving spout of casting powder for the formation of foundry slag, the local working temperatures and heat flux densities in the surface quality of a slab detected critical meniscus area and the measurement signals forwarded to a computer become.
- the invention also relates to a device for implementation of the procedure.
- the cooling water temperature of a mold wall becomes at least two Make in the region of the drain holes of a copper plate and the associated Water box is measured and measured from across the width of the copper plate Values a temperature profile is created and obtained in time intervals Temperature profiles are compared.
- the inlet temperature measured the cooling water, the difference between inlet and outlet temperature determined and from the cooling water quantity per unit time the partial integral Heat removal from a mold wall or from a Kokillenband Scheme determined and partial inequalities due to partial quantity corrections of the cooling water compensated.
- the liquid-cooled mold for carrying out 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 per broadside plate Temperature sensors are arranged at least at two points and their signal lines connected to a computer, preferably with an online screen are.
- the present invention seeks to provide a method and apparatus for continuously casting blocks, billets, slabs, especially of thin slabs, which are suitable, local temperatures and / or heat flux along the height of mold walls and at to calculate several points of its broadside extent at respectively different depths (X 1 , X 2 ) of the mold wall in the meniscus area.
- operating parameters such as the amount of cooling water, casting speed and casting powder are to be controlled in such a way that, given a preferred working temperature of the mold walls in the meniscus region, optimal surface formation of the slabs is possible with the mold being available as long as possible.
- a method according to the characterizing part of claim 1 is proposed in a method referred to in the preamble of claim 1 with the working temperatures along the height of the mold walls at several points of their Breitumbleerstreckung in each case different depths (X 1 , X 2 ), in the meniscus area by adjusting the relevant operating parameters such as the amount of cooling water or flow rate of the cooling water through the mold, casting speed and casting powder to be used in a predetermined temperature range (.DELTA.T) are maintained.
- a further embodiment of the method according to the invention provides that the associated local heat flow density is calculated from the temperature difference of at least two thermoelements located in approximately the same height range (Yi, eg y 1 , y 2 ).
- an embodiment of the method according to the invention provides that by determining the temperature or heat flow over the height of a Kokillenwand by means of approximation functions of the maximum temperature profile the wall surface in contact with the melt is calculated.
- there provides a further embodiment of the method, that upon detection of a Heat flux density change in mold height (y) due to two-dimensional Heat propagation in the bath level range (M) by assuming a heat flow density curve on a mold surface and with knowledge of the heat flux density in the depth (x) of a mold wall the position of the bath mirror (M) is determined online.
- Another embodiment of the method according to the invention provides that knowing the optimum heat flux 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 driven by casting speed and / or the casting powder becomes.
- thermocouples are arranged in the mold walls in the bathroom mirror area and below, the signal lines switched to a computer are according to the invention is that the thermocouples y m , y n in the broad side walls of the mold in an area above and below the bath level (M) and at different depths (X 1 , X 2 ) of the mold wall are arranged, and that the thermocouples y m , y n along the height of the mold walls at several points of their Breit conveyorerstreckung at equal distances from the contact surface with the molten metal in paired arrangement are embedded, wherein the arithmetic unit, which in accordance with the determined temperature or heat flux density, theeckntempe Calculating the temperature of the mold in the meniscus region (M), with actuator for the operating parametersdewassenge, casting speed and casting powder
- FIG. 1 shows a temperature profile or a heat flow profile over the height (y) of a mold wall and in at least two spacing regions (x 1 , x 2 ) of the mold wall from the molten bath (M).
- the curve of the strongly drawn curve (y 1 , y 3 , y 5 , y 7 , y 9 , y 11 ) shows a pronounced ternary maximum (T max ) in the range of a predetermined temperature range ( ⁇ T).
- the located further inside of the mold wall measuring points (y 2, y 4, y 6, y 8, y 10, y 12) show a similar curve with 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 via an electronic measuring device in a Display be recorded online and made visible. You can use this , the temperature in the specified temperature window ( ⁇ T) to keep the automatic control of the relevant operating parameters constant, in order to achieve an optimal surface formation, for example, in 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 bis 3500 mm Breite, mittels einer oszillierbaren, wasserkühlbaren Kokille im Zusammenwirken mit einem Tauchausguss unter Einsatz von Gießpulver zur Bildung von Gießschlacke, wobei die lokalen Arbeitstemperaturen und Wärmestromdichten im für die Oberflächenqualität einer Bramme kritischen Meniskusbereich erfasst und die Messsignale an einem Rechner weitergeleitet werden. Die Erfindung betrifft auch eine Vorrichtung zur Durchführung des Verfahrens.The invention relates to a method for the continuous casting of blocks, billets, Slabs, in particular of thin slabs, in the size range of approximately 20 up to 150 mm thick and approximately 600 to 3500 mm wide, by means of an oscillatable water-cooled mold used in conjunction with a diving spout of casting powder for the formation of foundry slag, the local working temperatures and heat flux densities in the surface quality of a slab detected critical meniscus area and the measurement signals forwarded to a computer become. The invention also relates to a device for implementation of the procedure.
Verfahren und Vorrichtungen zum Stranggießen, insbesondere von Dünnbrammen, sind bekannt und wurden im Laufe der zurückliegenden Entwicklungsperioden stetig verbessert.Methods and apparatus for continuous casting, in particular of thin slabs, are known and have been over the past development periods 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 of involved in continuous casting different media and the resulting Resistance to heat conduction and heat transfer the formation of a emerging strand shell of a cast strand and especially its Surface texture is variable within relatively wide limits. Especially plays in the thermal contact between the molten bath and mold wall, the thickness the liquid slag of molten casting powder because of their specific extremely low conductivity with about 1 W / K x m a significant role, because they the heat transfer between the melt and mold plates a considerable Resists resistance. Unlike liquid slag, it has copper an extremely high thermal conductivity of 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, which have a significant influence on the solidification behavior exercise 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 published in this context prior art is, for example, in the DE 41 17 073 C2, DE 195 29 931 A1 and DE 198 10 672 A1.
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 over the mold width and in principle, no amount of water for cooling changed.
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 a slab mold is described which consists of at least consists of three independent cooling chamber segments that in the area the Kokillenausgangs separate connections for the independent supply of mold cooling water exhibit. With this arrangement, asymmetries of the specific Heat flows between the immersion spout area and the rest Kokillenbereiche be recognized and conicity adjustment of the narrow sides the mold and cooling water control are compensated.
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.DE 198 10 672 A1 describes a method for measuring and regulating Temperature and amount of water-cooled per unit time, in particular from each other independent mold walls made of copper plates flowing through cooling water a continuous casting mold.
Dabei wird 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 gewonnene 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.At this time, the cooling water temperature of a mold wall becomes at least two Make in the region of the drain holes of a copper plate and the associated Water box is measured and measured from across the width of the copper plate Values a temperature profile is created and obtained in time intervals Temperature profiles are compared. In this case, the inlet temperature measured the cooling water, the difference between inlet and outlet temperature determined and from the cooling water quantity per unit time the partial integral Heat removal from a mold wall or from a Kokillenbandbereich determined and partial inequalities due to partial quantity corrections of the cooling water compensated. The liquid-cooled mold for carrying out 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 per broadside plate Temperature sensors are arranged at least at two points and their signal lines connected to a computer, preferably with an online screen are.
Der dem Anmeldungsgegenstand am nächsten kommende Stand der Technik
dürfte in der Zusammenfassung der Dokumente JP-63 104 745 (D1) bzw. in DE-A-34
23 475 (2) beschrieben sein.
Diese Dokumente betreffen Verfahren zum Stranggießen mit einer Erfassung und
Regelung der Temperatur der Kokillenwände. Als Regelungsgröße wird die Kühlintensität
bzw. Menge des Kühlmittels vorgeschlagen. In beiden Dokumenten
werden Thermoelemente im Badspiegelbereich und darunter angeordnet und die
Messsignale werden an einen Rechner weitergeleitet. The closest prior art to the subject of the application may be described in the abstract of documents JP-63 104 745 (D1) and in DE-A-34 23 475 (2).
These documents relate to methods of continuous casting with detection and control of the temperature of the mold walls. As a control variable, the cooling intensity or amount of the coolant is proposed. In both documents, thermocouples are placed in the bath level area and below and the measurement signals are forwarded to a computer.
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 in jeweils unterschiedlichen Tiefen (X1, X2) der Kokillenwand 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.Based on the aforementioned prior art, the present invention seeks to provide a method and apparatus for continuously casting blocks, billets, slabs, especially of thin slabs, which are suitable, local temperatures and / or heat flux along the height of mold walls and at to calculate several points of its broadside extent at respectively different depths (X 1 , X 2 ) of the mold wall in the meniscus area. By means of the measured values, operating parameters such as the amount of cooling water, casting speed and casting powder are to be controlled in such a way that, given a preferred working temperature of the mold walls in the meniscus region, optimal surface formation of the slabs is possible with the mold being available as long as possible.
Zur Lösung der Aufgabe wird bei einem Verfahren der im Oberbegriff von Anspruch 1 bezeichneten Art mit der Erfindung eine Vorgehensweise entsprechend dem Kennzeichnungsteil von Anspruch 1 vorgeschlagen, wobei die Arbeitstemperaturen entlang der Höhe der Kokillenwände an mehreren Stellen ihrer Breitseitenerstreckung in jeweils unterschiedlichen Tiefen (X1, X2), im Meniskusbereich durch Anpassung der hierfür maßgebenden Betriebsparameter wie Kühlwassermenge bzw. Durchlaufgeschwindigkeit des Kühlwassers durch die Kokille, Gießgeschwindigkeit und zu verwendendes Gießpulver, in einem vorgegebenen Temperaturbereich (Δ T) gehalten werden.To solve the problem, a method according to the characterizing part of claim 1 is proposed in a method referred to in the preamble of claim 1 with the working temperatures along the height of the mold walls at several points of their Breitseitenerstreckung in each case different depths (X 1 , X 2 ), in the meniscus area by adjusting the relevant operating parameters such as the amount of cooling water or flow rate of the cooling water through the mold, casting speed and casting powder to be used in a predetermined temperature range (.DELTA.T) are maintained.
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. 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 fasst werden.As a result, temperature profiles over the height of the mold plates are detected and by their course, the maximum temperatures and thus the position of the Meniscusbereiches the melt in the mold captured. With knowledge of the optimal Heat flux density makes it possible to increase the surface quality of continuous casting produced products, in particular of thin slabs to improve. An embodiment of the method provides that working temperatures of the mold plates through in each case a height range (Yi, i = 1 to n) over and under the bath level (M) arranged at defined intervals thermocouples be grasped.
Eine weitere Ausgestaltung des Verfahrens nach der Erfindung sieht vor, 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 the associated local heat flow density is calculated from the temperature difference of at least two thermoelements located in approximately the same height range (Yi, eg y 1 , y 2 ).
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 on the course of the heat flux density make it possible to deviate from a given course with the Correct this online operating parameters.
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 over the height of a Kokillenwand by means of approximation functions of the maximum temperature profile the wall surface in contact with the melt is calculated. there provides a further embodiment of the method, that upon detection of a Heat flux density change in mold height (y) due to two-dimensional Heat propagation in the bath level range (M) by assuming a heat flow density curve on a mold surface and with knowledge of the heat flux density in the depth (x) of a mold wall the position of the bath mirror (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, another embodiment of the method according to the invention provides that knowing the optimum heat flux 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 driven by 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, wobei Thermoelemente in den Kokillenwänden im Badspiegelbereich und darunter angeordnet sind, deren Signalleitungen einem Rechner aufgeschaltet sind, besteht erfindungsgemäß darin, dass die Thermoelemente ym, yn in den Breitseitenwänden der Kokille in einem Bereich über und unter dem Badspiegel (M) sowie in unterschiedlichen Tiefen (X1, X2) der Kokillenwand angeordnet sind, und dass die Thermoelemente ym, yn entlang der Höhe der Kokillenwände an mehreren Stellen ihrer Breitseitenerstreckung in gleichen Abständen von deren Kontaktfläche mit dem schmelzflüssigen Metall in paarweiser Anordnung eingelassen sind, wobei die Recheneinheit, welche nach Maßgabe der ermittelten Temperatur bzw. Wärmestromdichte die Oberflächentemperatur der Kokille im Meniskusbereich (M) errechnet, mit Stellgliedem für die Betriebsparameter Kühlwassemnenge, Gießgeschwindigkeit sowie Gießpulver in Verbindung steht, zur Steuerung einer bevorzugten Arbeitstemperatur der Kokillenwand innerhalb eines vorgegebenen Temperaturbereichs (Δ T).A device provided for carrying out the method for detecting local temperatures and / or heat fluxes on a water-cooled mold during continuous casting of blocks, billets, slabs, in particular of thin slabs, wherein thermocouples are arranged in the mold walls in the bathroom mirror area and below, the signal lines switched to a computer are according to the invention is that the thermocouples y m , y n in the broad side walls of the mold in an area above and below the bath level (M) and at different depths (X 1 , X 2 ) of the mold wall are arranged, and that the thermocouples y m , y n along the height of the mold walls at several points of their Breitseitenerstreckung at equal distances from the contact surface with the molten metal in paired arrangement are embedded, wherein the arithmetic unit, which in accordance with the determined temperature or heat flux density, the Oberflächentempe Calculating the temperature of the mold in the meniscus region (M), with actuator for the operating parameters Kühlwassemnenge, casting speed and casting powder is in communication, for controlling a preferred operating temperature of the mold wall within a predetermined temperature range (.DELTA.T).
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 Ternperatumiaximum (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 profile over the height (y) of a mold wall and in at least two spacing regions (x 1 , x 2 ) of the mold wall from the molten bath (M). The curve of the strongly drawn curve (y 1 , y 3 , y 5 , y 7 , y 9 , y 11 ) shows a pronounced ternary maximum (T max ) in the range of a predetermined temperature range (Δ T). The located further inside of the mold wall measuring points (y 2, y 4, y 6, y 8, y 10, y 12) show a similar curve with 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 via an electronic measuring device in a Display be recorded online and made visible. You can use this , the temperature in the specified temperature window (Δ T) to keep the automatic control of the relevant operating parameters constant, in order to achieve an optimal surface formation, for example, in a thin slab.
Claims (7)
- A method for continuously casting bars, billets or slabs, particularly thin slabs, with a thickness in the range of approximately 20-150 mm and a width in the range of approximately 600-3500 mm by means of an oscillating, water-cooled casting mould in cooperation with a submerged-entry nozzle, wherein casting powder is utilized for the formation of casting slag, and wherein the operating temperatures and the heat flux densities are measured in the meniscus area that is critical for the surface quality of a slab and the measuring signals are forwarded to a computer,
characterized in that the local operating temperatures over the height of the casting mould walls are maintained within a predetermined temperature range (ΔT) in the meniscus area at several locations of the wide lateral mould sidewalls and at respectively different depths (X1, X2) by adjusting the operating parameters decisive therefor, e.g., the amount or flow rate of the cooling water through the casting mould, the casting speed and the casting powder to be used. - The method according to Claim 1,
characterized in that operating temperatures of the casting mould plates are measured by thermoelements arranged at a defined spacing and within a height level (Yi) (i = 1 through n) above and underneath the bath level (M), respectively. - The method according to Claim 1 or 2,
characterized in that the corresponding local heat flux density is calculated from the temperature difference of at least two thermoelements positioned approximately at the same height level (Yi). - The method according to at least one of Claims 1-3,
characterized in that the maximum temperature course of the wall surface in contact with the molten metal is calculated by determining the temperature course or the heat flux course over the height of a wall of the casting mould with the aid of approximation functions. - The method according to at least one of Claims 1-4,
characterized in that, when detecting a heat flux density change at the height (y) of the casting mould as a result of two-dimensional heat distribution in the bath level area (M), the position of the bath level (M) is determined by utilizing an assumed heat flux density course at one surface of the casting mould and the known heat flux density at the depth (x) of a casting mould wall. - The method according to at least one of Claims 1-5,
characterized in that, when the optimal heat flux density or the maximum surface temperature of the casting mould is known, the best suited casting mould load for an optimal slab surface formation is adjusted by controlling the cooling water quantity and/or the casting speed and/or the casting powder. - A device for carrying out the method according to Claims 1-6 for measuring local temperatures and/or heat flux densities on a water-cooled casting mould during the continuous casting of bars, billets, slabs, in particular, thin slabs, wherein thermoelements are arranged in the casting mould walls in the area of the bath level, as well as underneath thereof, and wherein the signaling lines of said thermoelements are connected to a computer,
characterized in that the thermoelements (ym, yn) are arranged in the wide lateral sidewalls of the casting mould in an area above and underneath the bath level (M), as well as at different depths (X1, X2) of the casting mould wall, and in that the thermoelements (ym, yn) are embedded over the height of the casting mould wall in a paired arrangement at several locations over the width of the casting mould such that they are spaced apart from the contact surface with the molten metal by approximately the same distance, wherein a computer unit that calculates the surface temperature of the casting mould in the meniscus area (M) based on the measured temperature or heat flux density is connected to actuators for the operating parameters cooling water quantity, casting speed and casting powder in order to adjust a preferred operating temperature of the casting mould wall within a predetermined temperature range (ΔT).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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 |
| DE19956577 | 1999-11-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1103322A1 EP1103322A1 (en) | 2001-05-30 |
| EP1103322B1 true 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012224132A1 (en) * | 2012-12-21 | 2014-06-26 | Siemens Vai Metals Technologies Gmbh | Monitoring process for a continuous casting mold with construction of a database |
Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040256078A1 (en) * | 2001-09-28 | 2004-12-23 | Fritz-Peter Pleschiutschnigg | Method and device for cooling the copper plates of a continuous casting ingot mould for liquid metals, especially liquid steel |
| KR20040038224A (en) * | 2002-10-31 | 2004-05-08 | 주식회사 포스코 | Apparatus for detecting height of melten steel in continuous casting process |
| DE102006060673A1 (en) * | 2006-11-02 | 2008-05-08 | Sms Demag Ag | Method and control device for controlling the heat dissipation of a side plate of a mold |
| GB0623755D0 (en) * | 2006-11-28 | 2007-01-10 | Sarclad Ltd | Measuring system for continuous casting machines |
| DE102008029742A1 (en) | 2008-06-25 | 2009-12-31 | Sms Siemag Aktiengesellschaft | Mold for casting metal |
| 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 |
| 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. |
| CN102397999B (en) * | 2010-09-16 | 2013-05-29 | 鞍钢股份有限公司 | Method for measuring slag thickness and headroom of steel ladle |
| 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 |
| 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 |
| DE102014112206A1 (en) * | 2014-08-26 | 2016-03-03 | Peter Valentin | Method for continuous casting of a metal, in particular a steel, and apparatus for continuous casting |
| BR112017006891A2 (en) * | 2014-10-15 | 2017-12-12 | Nippon Steel & Sumitomo Metal Corp | apparatus, method and program for detecting the surface level of cast metal in continuous casting |
| 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 |
| JP7018405B2 (en) * | 2016-05-25 | 2022-02-10 | アー エル デー ヴァキューム テクノロジーズ ゲゼルシャフト ミット ベシュレンクテル ハフツング | Electroslag remelting method and melting container |
| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1983002911A1 (en) * | 1982-02-24 | 1983-09-01 | Yaji, Motoyasu | Method of controlling continuous casting facility |
| JPS58151952A (en) * | 1982-03-02 | 1983-09-09 | Kobe Steel Ltd | Method for cooling casting mold using electromagnetic stirring |
| DE3244903A1 (en) * | 1982-12-04 | 1984-06-07 | László Dipl.-Phys. 4190 Kleve Körtvélyessy | FAST THERMOCOUPLE LEVEL REGULATION |
| DE3423475C2 (en) * | 1984-06-26 | 1986-07-17 | Mannesmann AG, 4000 Düsseldorf | Method and device for the continuous casting of liquid metals, in particular of liquid steel |
| JPS63104754A (en) * | 1986-10-20 | 1988-05-10 | Mitsubishi Heavy Ind Ltd | Method for controlling water volume of spray cooled mold |
| JPH01284470A (en) * | 1988-05-12 | 1989-11-15 | Kawasaki Steel Corp | Method of controlling continuous casting of round ingot |
| DE4117073A1 (en) | 1991-05-22 | 1992-11-26 | Mannesmann Ag | TEMPERATURE MEASUREMENT SLAM CHOCOLATE |
| JPH06304727A (en) * | 1993-04-23 | 1994-11-01 | Nippon Steel Corp | Device for controlling casting velocity |
| JPH06320245A (en) * | 1993-05-12 | 1994-11-22 | Nippon Steel Corp | Heat extraction control device in mold |
| DE19529931C1 (en) | 1995-08-02 | 1997-04-03 | Mannesmann Ag | Plate mold for the production of steel strands |
| DE19810672B4 (en) | 1998-03-12 | 2006-02-09 | Sms Demag Ag | Method and continuous casting mold for producing slab strands, in particular of steel |
-
1999
- 1999-11-25 DE DE19956577A patent/DE19956577A1/en not_active Withdrawn
-
2000
- 2000-10-28 DE DE50009907T patent/DE50009907D1/en not_active Expired - Lifetime
- 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
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012224132A1 (en) * | 2012-12-21 | 2014-06-26 | Siemens Vai Metals Technologies Gmbh | Monitoring process for a continuous casting mold with construction of a database |
| DE102012224132B4 (en) | 2012-12-21 | 2023-10-05 | Primetals Technologies Austria GmbH | Monitoring method for a continuous casting mold with construction of a database |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19956577A1 (en) | 2001-05-31 |
| JP2001334354A (en) | 2001-12-04 |
| US6776217B1 (en) | 2004-08-17 |
| DE50009907D1 (en) | 2005-05-04 |
| ATE291980T1 (en) | 2005-04-15 |
| EP1103322A1 (en) | 2001-05-30 |
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