EP0881018B1 - Watercooled mould for continuous casting - Google Patents
Watercooled mould for continuous casting Download PDFInfo
- Publication number
- EP0881018B1 EP0881018B1 EP98109430A EP98109430A EP0881018B1 EP 0881018 B1 EP0881018 B1 EP 0881018B1 EP 98109430 A EP98109430 A EP 98109430A EP 98109430 A EP98109430 A EP 98109430A EP 0881018 B1 EP0881018 B1 EP 0881018B1
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- EP
- European Patent Office
- Prior art keywords
- mold
- water
- chill mould
- cooling water
- outlet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009749 continuous casting Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000498 cooling water Substances 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 17
- 239000010949 copper Substances 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000005266 casting Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims 1
- 239000010703 silicon Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000012546 transfer Methods 0.000 description 7
- 230000009189 diving Effects 0.000 description 4
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 description 4
- 238000009529 body temperature measurement Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 239000000314 lubricant Substances 0.000 description 3
- 239000000155 melt Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001879 copper Chemical class 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000161 steel melt Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
Definitions
- the invention relates to a liquid-cooled continuous casting mold with each other independent mold walls made of copper plates.
- Your education depends on a number of interacting factors such as casting speed, steel temperature, material, strand geometry, Immersion mold, taper of the mold and the type and composition of a slag-forming lubricant that, when applied to the mold level, reduce the inevitable friction between the strand shell and the mold should. It is particularly important that the lubricant is evenly distributed in the area of the mold walls, this in the form of a so-called Casting powder applied to the mold level, thereby melting and by oscillating movements of the molten steel between these and the mold walls arrives. The lubricant should spread as evenly as possible between the strand shell that forms and the mold walls is related with the heat transfer conditions between the strand shell and the mold wall of particular importance.
- a plate mold for is from DE 24 15 224 C3 Slabs known, the mold walls have cooling chambers, each delimited Include cooling areas.
- the broad side walls are measuring elements for determining the amount of heat dissipated or the cooling capacities arranged. With the help of these measuring elements a Average value of the cooling capacity of the cooling chambers, which one Average generator is fed in, with which the conicity of the narrow sides is controlled becomes.
- the disadvantage here is that differentiated information in the molds mentioned about the partial heat flows along the mold width are not made. This is also disadvantageous because for the safe casting of slabs and especially of thin slabs at comparatively high casting speeds a determination of differentiated specific heat transfers in the area of the broadsides and especially not in the middle of the slab in the area of the dip tube becomes. Only with knowledge of these specific heat transfers can a regulation of the heat flows over the entire broadside of the mold and so that over the entire slab side can be reached in order to disturbances in particular to avoid by uneven formation of the strand shell.
- the broad side walls have at least three side by side and mutually independent cooling segments, these being symmetrical are divided to the center axis and separate in the area of the mold outlet Have connections for the independent supply of a liquid cooling medium.
- the cooling water temperature of a mold wall is at a point in the area of the drain openings of a copper plate and the associated water tank measured.
- the temperature readings of the The mold wall and the cooling water are a controller for changing the Taper of the mold narrow sides or to change the mold oscillation switched.
- the object of the invention based on specifying an improved continuous casting mold, which is suitable in Inside the mold, heat flows are formed in the melt by means of sensitive, differentiated measurements of the heat flows corresponding to these of the cooling water flowing through the mold walls without any time delay to capture in time control impulses to regulate unwanted Heat exchange conditions, especially with regard to training derive the strand shell in the area of the mold walls.
- the task is solved with a continuous casting mold with independent of each other Mold walls made of copper plates, the lower part of the Broad side wall of the mold the inlet of cooling water and in the upper area of the Broad side wall of the drainage of cooling water is arranged, in close succession and each in a vertical plane cooling channels with inlet bores and outlet bores are arranged, the inlet holes cooperating the Form water inlet of the cooling water flow into the cooling channels of the mold wall, while the sum of the drain holes combined the water drain form, and in the cooling water inlet at least one temperature sensor and one Dispenser is arranged for the inflow amount per unit of time and also in Water drainage area between a copper plate and the cooling water drainage openings of the water tank, in particular at least per broad side plate Two places temperature sensors are arranged, the signal lines together with the signal lines of the temperature sensors of the water inlet to a computer, preferably with an online screen.
- the mold according to the invention enables a differentiated statement about the Distribution of partial heat flows along the mold width and thus a simple one and safe temperature control of the heat flows close to the wall of the melt inside the mold including the middle of the broadside in the area of the dip tube or the diving spout.
- it is possible along the width of a Chill mold and especially in the area of the diving spout compared to the other areas of the broad sides and to the narrow sides an extreme sensitive and uniform cooling performance and thus disturbances Avoid, for example, the flow shadow caused by the diving spout non-uniform lubricating film thickness, high membrane effect of the strand shell in the Slab center and due to turbulence of the casting level across the slab width can be caused.
- the water drain openings are between Copper plate and water box are evenly distributed in the mold width and each designed for the passage of a constant, equal amount of water.
- the continuous casting mold according to the invention is both for the production of thin slabs made of steel with strand thicknesses between preferably 40 and 150 mm comparatively high casting speeds as well as for billet molds for Continuous casting of rectangular or round-shaped continuous casting profiles provided.
- Fig. 1 shows an existing copper mold side wall 1 with a Metal melt bath 2 'facing surface part 3.
- a Metal melt bath 2 'facing surface part 3 In the solid wall made of copper are arranged in close succession of coolant holes 4, the bottom of are forced to flow above with cooling water. These open on the upper side in a collecting channel 10, which by means of drain holes 5 in a water tank 7 transfers. This is with the plate-shaped elements 6 and 11 of the water tank 7 trained.
- thermal coupling 8 in the form of a copper longitudinal bar with channels to accommodate the individual Thermal sensors 20 (Fig. 2) leading signal lines 9.
- the thermal coupling can For example, be an independent assembly that the individual thermal sensors 20th records with their signal lines 9. It can be used with TP 100 silicone in Corner area of the wall part 6 can be fastened in such a way that it has at least two Surfaces in the flow area of the coolant. Also per measuring point a hole is drilled through the water box in the upper area, which can then be provided with a sensor from the outside.
- Fig. 2 shows the surface part 3 of a plate mold with an inventive Plenty of cooling water drain holes 5 in the upper area of the broad side wall 1 in a horizontal projection on both sides of the dip tube 21.
- In the lower Area of the broad side wall 1 are in for the supply of cooling water close sequence and each in a vertical plane with the drain holes 5 Inlet bores 15, also on both sides of the mold wall center plane v-v.
- the bores 15 cooperatively form the water inlet 24 of the cooling water flow into the cooling channels 4 of the mold wall 1, while the sum of the drain holes 5 taken together form the water drain 25.
- On the right and to the left of the median plane v-v are the side closure of the Broad side wall 1 forming narrow side walls 22 and 23.
- the thermal sensor 20 is installed between each two water drain holes 5, the thermal sensor 20 is installed. In doing so in each case two water drain holes 5 arranged next to one another with two in the same vertical plane arranged water inlet holes 15 each Flow field A, B, C, D or A ', B'
- FIG. 3 shows a three-dimensional diagram with the representation of temperature profiles, measured across the width A 'to D of a slab mold plate with, for example, four that are separated in time and can be compared Corresponding temperature profiles at intervals of ten time units the time axis Z.
- the width of the mold plate is on the abscissa x-x and the value of the measured heat transport is plotted on the ordinate Y.
- the representation corresponds, for example, to a diagram on the computer screen and enables immediate evaluation or correction in the event of a deviation from a given temperature profile.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft eine flüssigkeitsgekühlte Stranggießkokille mit von einander unabhängigen Kokillenwänden aus Kupferplatten.The invention relates to a liquid-cooled continuous casting mold with each other independent mold walls made of copper plates.
Beim Stranggießen von Stahl in flüssigkeitsgekühlten Plattenkokillen, insbesondere zur Erzeugung von Dünnbrammen aus Stahl mit Strangdicken zwischen 150 und 40 mm bei vergleichsweise hohen Gießgeschwindigkeiten unter Einsatz von mindestens einem Tauchrohr wird innerhalb der Kokille im Bereich der Kokillenmündung aufgrund der vergleichsweise geringen Wärmeleitfähigkeit des Stahls zunächst nur eine dünne, aus erstarrter Schmelze bestehende und infolge ihrer noch sehr hohen Temperatur relativ nachgiebige Strangschale gebildet. Weil diese innerhalb der Kokille und nach Austritt aus der Kokille dem ferrostatischen Druck der in ihrem Innern noch flüssigen Schmelze standhalten muß, ist es erforderlich, daß die entstehende Strangschale über den Umfang eine möglichst gleichmäßige Dicke besitzt. Ihre Ausbildung hängt von einer Reihe zusammenwirkender Faktoren ab, wie bspw. Gießgeschwindigkeit, Stahltemperatur, Werkstoff, Stranggeometrie, Tauchausgußform, Konizität der Kokille sowie von der Art und Zusammensetzung eines schlackenbildenden Schmiermittels, das, auf den Gießspiegel aufgebracht, die unvermeidliche Reibung zwischen Strangschale und Kokille reduzieren soll. Besonders wichtig ist hierbei eine gleichmäßige Verteilung des Schmiermittels im Bereich der Kokillenwände, wobei dieses in Form eines sogenannten Gießpulvers auf den Gießspiegel aufgebracht, dabei geschmolzen und durch Oszillationsbewegungen des flüssigen Stahls zwischen diesen und die Kokillenwände gelangt. Eine möglichst gleichmäßige Ausbreitung des Schmiermittels zwischen der sich bildenden Strangschale und den Kokillenwänden ist im Zusammenhang mit den Wärmeübergangsverhältnissen zwischen der Strangschale und der Kokillenwand von besonderer Bedeutung. Durch sorgfältige Temperaturmessungen im Bereich der Kokillenwände lassen sich Rückschlüsse über die Verteilung der Wärmeströme, insbesondere über die Kokillenbreite ziehen. Dies ist wichtig, weil für ein sicheres Gießen von Brammen und speziell von Dünnbrammen der eingangs genannten Art die Kenntnis spezifischer Wärmeübergänge der Kokillenbreitseiten und insbesondere in der Brammenmitte im Bereich des Tauchrohres von besonderer Bedeutung ist. Damit können Störungen rechtzeitig vermieden oder ihnen entgegengewirkt werden, welche bspw. durch vom Tauchausguß verursachte Strömungsanomalitäten, ungleiche Dicke des Schmierfilms von Gießschlacke, hohe Membranwirkung der Strangschale insbesondere in der Brammenmitte, Turbulenzen des Gießspiegels über die Brammenbreite hervorgerufen werden. Ebenso lassen sich Folgen eines ungleichförmigen Wärmedurchgangs bedingt bspw. durch Turbulenzen des Stahls in der Kokille durch eine Temperaturmessung rechtzeitig erkennen. Dies ist von besonderer Bedeutung, weil durch die genannten Anomalitäten im Gießprozeß, insbesondere eine mögliche Abweichung der Strangschalenbildung von der Kokillenmitte Längsrisse in der Strangoberfläche bis hin zu Durchbrüchen, sogenannten Klebern, zur Folge haben können. Zugleich mit solchen Störungen an der Strangschale treten entsprechende thermische partielle Belastungen der Kupferplatten auf, die zur Verringerung der Standzeit der Kokille führen.When continuously casting steel in liquid-cooled plate molds, in particular for the production of thin slabs from steel with strand thicknesses between 150 and 40 mm at comparatively high casting speeds using at least one dip tube is located in the mold in the area of the mold mouth due to the comparatively low thermal conductivity of the steel initially only a thin, solidified melt and as a result of their still very high temperature relatively flexible strand shell formed. Because this inside the mold and after leaving the mold the ferrostatic pressure which still has to withstand liquid melt inside, it is necessary that the resulting strand shell is as uniform as possible over the circumference Has thickness. Your education depends on a number of interacting factors such as casting speed, steel temperature, material, strand geometry, Immersion mold, taper of the mold and the type and composition of a slag-forming lubricant that, when applied to the mold level, reduce the inevitable friction between the strand shell and the mold should. It is particularly important that the lubricant is evenly distributed in the area of the mold walls, this in the form of a so-called Casting powder applied to the mold level, thereby melting and by oscillating movements of the molten steel between these and the mold walls arrives. The lubricant should spread as evenly as possible between the strand shell that forms and the mold walls is related with the heat transfer conditions between the strand shell and the mold wall of particular importance. Through careful temperature measurements In the area of the mold walls, conclusions can be drawn about the Distribution of the heat flows, especially across the mold width. This is important because for the safe casting of slabs and especially thin slabs knowledge of specific heat transfers of the type mentioned at the outset Chill broad sides and especially in the middle of the slab in the area of the dip tube is of particular importance. This way, malfunctions can be avoided in good time or counteracted them, for example by the diving spout caused flow anomalies, uneven thickness of the lubricating film from Pouring slag, high membrane effect of the strand shell especially in the Slab center, turbulence of the mold level caused by the slab width become. There are also consequences of non-uniform heat transfer caused, for example, by turbulence of the steel in the mold by a temperature measurement recognize in time. This is particularly important because due to the anomalies mentioned in the casting process, in particular a possible one Deviation of the strand shell formation from the mold center longitudinal cracks in the Strand surface up to breakthroughs, so-called adhesives can. Corresponding disturbances occur at the strand shell at the same time thermal partial loads on the copper plates, leading to the reduction the service life of the mold.
Beim Stand der Technik ist aus der DE 24 15 224 C3 eine Plattenkokille für Brammen bekannt, deren Kokillenwände Kühlkammern aufweisen, die jeweils abgegrenzte Kühlbereiche umfassen. An die Zu- und Abflußleitungen für Kühlwasser der Breitseitenwände sind Meßglieder zur Bestimmung der abgeführten Wärmemenge bzw. der Kühlleistungen angeordnet. Mit Hilfe dieser Meßglieder wird ein Durchschnittswert der Kühlleistung der Kühlkammern errechnet, welcher einem Durchschnittsbildner zugeleitet wird, mit dem die Konizität der Schmalseiten gesteuert wird.In the prior art, a plate mold for is from DE 24 15 224 C3 Slabs known, the mold walls have cooling chambers, each delimited Include cooling areas. To the inlet and outlet pipes for cooling water the broad side walls are measuring elements for determining the amount of heat dissipated or the cooling capacities arranged. With the help of these measuring elements a Average value of the cooling capacity of the cooling chambers, which one Average generator is fed in, with which the conicity of the narrow sides is controlled becomes.
Aus der DE 41 17 073 C2 ist es bekannt, mit Hilfe von kalorimetrischen Messungen an einer rechteckigen oder bombierten Dünnbrammenkokille den integralen und spezifischen Wärmetransport an jeder einzelnen Kupferplatte zu bestimmen. Ein Online-Vergleich der spezifischen Wärmeströme von der dem Stahl zugewandten Kupferplattenseite zur wassergekühlten Seite speziell der Schmalseiten, mit denen der zwei Breitseiten, ermöglicht eine Regelung der Schmalseitenkonizität unabhängig von den im einzelnen gewählten Gießparametern.From DE 41 17 073 C2 it is known with the help of calorimetric measurements the integral on a rectangular or convex thin slab mold and determine specific heat transfer on each individual copper plate. An online comparison of the specific heat flows from the one facing the steel Copper plate side to the water-cooled side especially the narrow sides, with those of the two broad sides, allows regulation of the narrow side conicity regardless of the individually selected casting parameters.
Von Nachteil ist hierbei, daß bei den genannten Kokillen differenzierte Angaben über die partiellen Wärmeströme entlang der Kokillenbreite nicht gemacht werden. Dies ist auch deshalb nachteilig, weil für ein sicheres Gießen von Brammen und speziell von Dünnbrammen bei vergleichsweise hohen Gießgeschwindigkeiten eine Ermittlung differenzierter spezifischer Wärmeübergänge im Bereich der Breitseiten und besonders in der Brammenmitte im Bereich des Tauchrohres nicht vorgenommen wird. Nur bei Kenntnis dieser spezifischen Wärmeübergänge kann eine Einregulierung der Wärmeströme über die gesamte Kokillenbreitseite und damit über die gesamte Brammenseite erreicht werden, um Störungen insbesondere durch ungleichförmige Ausbildung der Strangschale zu vermeiden.The disadvantage here is that differentiated information in the molds mentioned about the partial heat flows along the mold width are not made. This is also disadvantageous because for the safe casting of slabs and especially of thin slabs at comparatively high casting speeds a determination of differentiated specific heat transfers in the area of the broadsides and especially not in the middle of the slab in the area of the dip tube becomes. Only with knowledge of these specific heat transfers can a regulation of the heat flows over the entire broadside of the mold and so that over the entire slab side can be reached in order to disturbances in particular to avoid by uneven formation of the strand shell.
Um günstige Voraussetzungen für das Gießen von Dünnbrammen zu schaffen, wurde aus dem Dokument WO 97/04 900 eine Plattenkokille mit wassergekühlten, zwischen Breitseitenwänden einklemmbaren Schmalseitenwänden bekannt, mit Einrichtungen zum Verstellen des formgebenden Hohlraums an verschiedene Strangabmessungen sowie des Gießkonus, mit einer Oszillationseinrichtung. Bei dieser Kokille weisen die Breitseitenwände mindestens drei nebeneinanderliegende und voneinander unabhängige Kühlsegmente auf, wobei diese symmetrisch zur Mittenachse aufgeteilt sind und im Bereich der Kokillenausmündüng gesonderte Anschlüsse zur unabhängigen Zufuhr eines flüssigen Kühlmediums besitzen. In der dem Strang zugewandten Wandung der Kammern sind Temperaturfühler vorgesehen, mit denen die Temperaturdifferenz zwischen einzelnen Kammern bzw. Zonen erfaßt werden können. Die Kühlwassertemperatur einer Kokillenwand wird an einer Stelle im Bereich der Ablauföffnungen einer Kupferplatte und dem zugeordneten Wasserkasten gemessen. Die Temperaturmeßwerte der Kokillenwand und des Kühlwassers werden einem Regler zur Veränderung der Konizität der Kokillenschmalseiten bzw. zur Veränderung der Kokillenoszillation aufgeschaltet.To create favorable conditions for casting thin slabs, a plate mold with water-cooled, known narrow side walls clampable between broad side walls, with Means for adjusting the shaping cavity to different Strand dimensions and the casting cone, with an oscillation device. at In this mold, the broad side walls have at least three side by side and mutually independent cooling segments, these being symmetrical are divided to the center axis and separate in the area of the mold outlet Have connections for the independent supply of a liquid cooling medium. There are temperature sensors in the wall of the chambers facing the strand provided with which the temperature difference between individual chambers or zones can be detected. The cooling water temperature of a mold wall is at a point in the area of the drain openings of a copper plate and the associated water tank measured. The temperature readings of the The mold wall and the cooling water are a controller for changing the Taper of the mold narrow sides or to change the mold oscillation switched.
Diese Aufteilung in separate Kammern oder Zonen hat aber auch den Nachteil, daß sich beiderseits von Trennstegen benachbarter Kammern oder Zonen erheblich unterschiedliche Temperaturströmungen ausbilden können, die nur mit vergleichsweise längerer Zeitverzögerung einander angeglichen werden können. Eine feinfühlige Erfassung partieller Wärmeströme bzw. Wärmestromdifferenzen bspw. über die Gesamtbreite einer Kokillenseitenwand ist bei der bekannten Ausbildung der Kühlsegmente nicht zufriedenstellend möglich.However, this division into separate chambers or zones also has the disadvantage that that on both sides of dividers of adjacent chambers or zones considerably can form different temperature flows that only with comparative longer time delay can be adjusted. A sensitive detection of partial heat flows or heat flow differences For example, over the entire width of a mold side wall is in the known design of the cooling segments is not satisfactorily possible.
Aus der DE 34 23 475 A1 ist eine Strangießkokille mit Breitseitenwänden und verstellbaren Schmalseitenwänden aus Kupferplatten bekannt, bei der Thermoelemente ausschließlich in den Schmalseitenwänden über deren Höhe angeordnet sein sollen und die Temperatur-Meßwerte zur Steuerung der Gießparameter wie Oszillation, Hubhöhe, Frequenz und Gießpulvereigenschaften verwendet wurden.From DE 34 23 475 A1 is a continuous casting mold with wide side walls and adjustable Narrow side walls made of copper plates are known in the case of thermocouples arranged exclusively in the narrow side walls above their height should be and the temperature measurement values for controlling the casting parameters such as Oscillation, lifting height, frequency and mold powder properties were used.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine verbesserte Stranggießkokille anzugeben, welche geeignet ist, im Innern der Kokille in der Schmelze sich ausbildende Wärmeströme mittels feinfühliger, differenzierter Messungen der mit diesen korrespondierenden Wärmeströme des die Kokillenwände durchströmenden Kühlwasser möglichst zeitverzögerungslos zu erfassen, um daraus rechtzeitig Regelimpulse zur Ausregelung unerwünschter Wärmeaustauschverhältnisse, insbesondere hinsichtlich der Ausbildung der Strangschale im Bereich der Kokillenwände abzuleiten.Starting from the aforementioned prior art, the object of the invention based on specifying an improved continuous casting mold, which is suitable in Inside the mold, heat flows are formed in the melt by means of sensitive, differentiated measurements of the heat flows corresponding to these of the cooling water flowing through the mold walls without any time delay to capture in time control impulses to regulate unwanted Heat exchange conditions, especially with regard to training derive the strand shell in the area of the mold walls.
Die Lösung der Aufgabe erfolgt mit einer Stranggießkokille mit von einander unabhängigen Kokillenwänden aus Kupferplatten, wobei im unteren Bereich der Breitseitenwand der Kokille der Zulauf von Kühlwasser und im oberen Bereich der Breitseitenwand der Ablauf von Kühlwasser angeordnet ist, wobei in dichter Folge und jeweils in einer vertikalen Ebene Kühlkanäle mit Zulaufbohrungen und Ablaufbohrungen angeordnet sind, wobei die Zulaufbohrungen zusammenwirkend den Wasserzulauf des Kühlwasserstromes in die Kühlkanäle der Kokillenwand bilden, während die Summe der Ablaufbohrungen zusammengenommen den Wasserablauf bilden, und im Kühlwasserzulauf wenigstens ein Temperaturfühler und ein Geber für die Zulaufmenge pro Zeiteinheit angeordnet ist und wobei ferner im Wasserablaufbereich zwischen einer Kupferplatte und den Kühlwasserablauföffnungen des Wasserkastens insbesondere pro Breitseitenplatte mindestens an zwei Stellen Temperaturfühler angeordnet sind, deren Signalleitungen zusammen mit den Signalleitungen der Temperaturfühler des Wasserzulaufs an einen Rechner, bevorzugt mit einem Online-Bildschirm, angeschlossen sind.The task is solved with a continuous casting mold with independent of each other Mold walls made of copper plates, the lower part of the Broad side wall of the mold the inlet of cooling water and in the upper area of the Broad side wall of the drainage of cooling water is arranged, in close succession and each in a vertical plane cooling channels with inlet bores and outlet bores are arranged, the inlet holes cooperating the Form water inlet of the cooling water flow into the cooling channels of the mold wall, while the sum of the drain holes combined the water drain form, and in the cooling water inlet at least one temperature sensor and one Dispenser is arranged for the inflow amount per unit of time and also in Water drainage area between a copper plate and the cooling water drainage openings of the water tank, in particular at least per broad side plate Two places temperature sensors are arranged, the signal lines together with the signal lines of the temperature sensors of the water inlet to a computer, preferably with an online screen.
Die erfindungsgemäße Kokille ermöglicht eine differenzierte Aussage über die Verteilung partieller Wärmeströme entlang der Kokillenbreite und somit eine einfache und sichere Temperaturführung der wandnahen Wärmeströme der Schmelze innerhalb der Kokille einschließlich der Breitseitenmitte im Bereich des Tauchrohres bzw. des Tauchausgusses. Zugleich wird ermöglicht, entlang der Breite einer Kokille und insbesondere im Bereich des Tauchausgusses im Vergleich zu den übrigen Flächenteilen der Breitseiten sowie zu den Schmalseiten eine äußerst feinfühlige und gleichförmige Kühlleistung einzustellen und damit Störungen zu vermeiden, die bspw. strömungsschattenbedingt durch den Tauchausguß, durch ungleichförmige Schmierfilmdicke, hohe Membranwirkung der Strangschale in der Brammenmitte und durch Turbulenzen des Gießspiegels über die Brammenbreite hervorgerufen werden können.The mold according to the invention enables a differentiated statement about the Distribution of partial heat flows along the mold width and thus a simple one and safe temperature control of the heat flows close to the wall of the melt inside the mold including the middle of the broadside in the area of the dip tube or the diving spout. At the same time, it is possible along the width of a Chill mold and especially in the area of the diving spout compared to the other areas of the broad sides and to the narrow sides an extreme sensitive and uniform cooling performance and thus disturbances Avoid, for example, the flow shadow caused by the diving spout non-uniform lubricating film thickness, high membrane effect of the strand shell in the Slab center and due to turbulence of the casting level across the slab width can be caused.
Wesentlich ist hierbei die Maßnahme, daß die partiellen oder integralen Wärmeströme des Kühlwassers oder der Schmelze über die Kokillenbreite in Form von Temperaturprofilen sichtbar gemacht werden. Diese Maßnahme gestattet dem Gießer einen unmittelbaren Überblick über die verschiedenen Wärmeströme und insbesondere deren zeitliche Änderung und ermöglicht einen sofortigen Eingriff bei offensichtlich erkennbaren Störungen. Außerdem können Grenzwerte erarbeitet werden, die für eine Durchbruchvermeidung genutzt werden können. Besonders vorteilhaft ist es, daß die Temperaturprofile von Kühlwasser oder Schmelze auf einem Online-Bildschirm sichtbar gemacht werden.What is essential here is the measure that the partial or integral heat flows of the cooling water or the melt across the mold width in the form made visible by temperature profiles. This measure allows the Pour an instant overview of the various heat flows and especially their change in time and enables immediate intervention obviously noticeable faults. Limit values can also be drawn up that can be used to prevent breakthroughs. Especially It is advantageous that the temperature profiles of cooling water or melt be made visible on an online screen.
Weitere Ausgestaltungen der Kokille sind entsprechend den Unteransprüchen vorgesehen.Further configurations of the mold are in accordance with the subclaims intended.
Nach einer bevorzugten Ausgestaltung sind die Wasserablauföffnungen zwischen Kupferplatte und Wasserkasten in der Kokillenbreite gleichmäßig verteilt angeordnet und jeweils für den Durchtritt einer konstanten, gleichen Wassermenge ausgebildet.According to a preferred embodiment, the water drain openings are between Copper plate and water box are evenly distributed in the mold width and each designed for the passage of a constant, equal amount of water.
Die Stranggießkokille nach der Erfindung ist sowohl für die Erzeugung von Dünnbrammen aus Stahl mit Strangdicken zwischen vorzugsweise 40 und 150 mm bei vergleichsweise hohen Gießgeschwindigkeiten als auch für Knüppelkokillen zum Stranggießen von rechteck- oder rundformatigen Stranggießprofilen vorgesehen.The continuous casting mold according to the invention is both for the production of thin slabs made of steel with strand thicknesses between preferably 40 and 150 mm comparatively high casting speeds as well as for billet molds for Continuous casting of rectangular or round-shaped continuous casting profiles provided.
Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in den Zeichnungen schematisch dargestellten Ausführungsbeispieles. Es zeigen:
Figur 1- im Querschnitt einen Teil einer Kokillen-Längswand mit zugeordnetem Wasserkasten und Anordnung einer Thermokupplung mit Wärmefühlern;
Figur 2- eine Ansicht einer Kokillen-Breitseitenwand mit Anordnung von Kühlwasser-Temperatur-Meßeinrichtungen im Bereich des Wasserzulaufs sowie im Bereich des Wasserablaufs, teilweise im Schnitt;
Figur 3- mehrere Temperaturprofile entlang einer Breitseite einer Kokille im Vergleich mit in Zeitintervallen gewonnen Temperaturprofilen.
- Figure 1
- in cross section part of a mold longitudinal wall with an associated water tank and arrangement of a thermal coupling with heat sensors;
- Figure 2
- a view of a mold broad side wall with arrangement of cooling water temperature measuring devices in the area of the water inlet and in the area of the water outlet, partly in section;
- Figure 3
- several temperature profiles along a broad side of a mold in comparison with temperature profiles obtained in time intervals.
Fig. 1 zeigt eine aus Kupfer bestehende Kokillen-Breitseitenwand 1 mit einem dem
Metallschmelzbad 2`zugewandten Flächenteil 3. In der massiven Wand aus Kupfer
sind in dichter Folge Kühlmittelbohrungen 4 angeordnet, die von unten nach
oben mit Kühlwasser zwangsdurchströmt sind. Diese münden an der oberen Seite
in einen Sammelkanal 10, welcher mittels Ablaufbohrungen 5 in einen Wasserkasten
7 überleitet. Dieser ist mit den plattenförmigen Elementen 6 und 11 des Wasserkastens
7 ausgebildet.Fig. 1 shows an existing copper
Im Bereich der Ablaufbohrung 5 befindet sich eine Thermokupplung 8 in Form eines
kupfernen Längssteges mit Kanälen zur Aufnahme der zu den einzelnen
Thermofühlern 20 (Fig. 2) führenden Signalleitungen 9. Die Thermokupplung kann
bspw. eine selbstständige Baugruppe sein, welche die einzelnen Thermofühler 20
mit ihren Signalleitungen 9 aufnimmt. Sie kann mit Silicone vom Typ TP 100 im
Eckbereich des Wandteils 6 in der Art befestigt sein, daß sie mit mindestens zwei
Flächen im Strömungsbereich der Kühlflüssigkeit liegt. Auch kann pro Meßstelle
eine Bohrung durch den Wasserkasten im oberen Bereich eingebracht werden,
die dann von außen mit einem Meßfühler versehen werden kann. In the area of the
Fig. 2 zeigt das Flächenteil 3 einer Plattenkokille mit einer erfindungsgemäßen
Vielzahl von Kühlwasserablaufbohrungen 5 im oberen Bereich der Breitseitenwand
1 in horizontaler Projektion zu beiden Seiten des Tauchrohres 21. Im unteren
Bereich der Breitseitenwand 1 befinden sich für den Zulauf von Kühlwasser in
dichter Folge und jeweils in einer vertikalen Ebene mit den Ablaufbohrungen 5
Zulaufbohrungen 15, ebenfalls zu beiden Seiten der Kokillenwand-Mittelebene v-v.
Die Bohrungen 15 bilden zusammenwirkend den Wasserzulauf 24 des Kühlwasserstromes
in die Kühlkanäle 4 der Kokillenwand 1, während die Summe der Ablaufbohrungen
5 zusammen genommen den Wasserablauf 25 bilden. Je rechts
und links von der Mittelebene v-v befinden sich die den seitlichen Abschluß der
Breitseitenwand 1 bildenden Schmalseitenwände 22 und 23. Zwischen jeweils
zwei Wasserablaufbohrungen 5 ist der Thermofühler 20 installiert. Dabei bilden
jeweils zwei nebeneinander angeordnete Wasserablaufbohrungen 5 mit zwei in
gleicher vertikaler Ebene angeordneten Wasserzulaufbohrungen 15 jeweils ein
Strömungsfeld A, B, C, D bzw. A', B', C', D'.Fig. 2 shows the
Fig. 3 zeigt ein dreidimensionales Diagramm mit der Darstellung von Temperaturprofilen, gemessen jeweils über die Breite A' bis D einer Brammenkokillenplatte mit bspw. vier zeitlich auseinanderliegenden und miteinander zu vergleichenden Temperaturprofilen in zeitlichen Abständen von je zehn Zeiteinheiten entsprechend der Zeitachse Z. Die Breite der Kokillenplatte ist an der Abszisse x-x und der Wert des gemessenen Wärmetransportes auf der Ordinate Y aufgetragen. Die Darstellung entspricht bspw. einem Diagramm auf dem Bildschirm des Rechners und ermöglicht eine sofortige Auswertung bzw. Ausregelung im Falle eines Abweichens von einem vorgegebenen Temperaturprofil. 3 shows a three-dimensional diagram with the representation of temperature profiles, measured across the width A 'to D of a slab mold plate with, for example, four that are separated in time and can be compared Corresponding temperature profiles at intervals of ten time units the time axis Z. The width of the mold plate is on the abscissa x-x and the value of the measured heat transport is plotted on the ordinate Y. The The representation corresponds, for example, to a diagram on the computer screen and enables immediate evaluation or correction in the event of a deviation from a given temperature profile.
- 11
- BreitseitenwandWide side wall
- 22
- Stahl-SchmelzenbadSteel melt bath
- 33
- Wandseite/FlächenteilWall side / surface part
- 44
- Kühlwasser-BohrungCooling water bore
- 55
- Kühlwasser-AblaufbohrungCooling water drain hole
- 66
- Platten-ElementPlate member
- 77
- Wasserkastencistern
- 88th
- Thermokupplungthermocouple
- 99
- Signalleitungsignal line
- 1010
- Sammelkanalcollecting duct
- 1111
- Platten-ElementPlate member
- 1515
- Zulaufbohrungensupply boreholes
- 2020
- Thermofühlerthermocouple
- 2121
- Tauchrohrdip tube
- 2222
- SchmalseitenwändeNarrow side walls
- 2323
- SchmalseitenwändeNarrow side walls
- 2424
- Wasserzulaufwater supply
- 2525
- Wasserablaufwater drain
Claims (5)
- Liquid-cooled, continuous casting chill mould with mutually independent chill mould walls of copper plate, wherein the inlet (24) of cooling water is arranged in the lower region of the wide side wall of the chill mould and the outlet (25) of cooling water is arranged in the upper region of the wide side wall, wherein cooling channels (4) with inlet bores (15) and outlet bores (5) are arranged in close succession and each in a respective vertical plane, wherein the inlet bores co-operatively form the water inlet (24) of the cooling water flow in the cooling channels (4) of the chill mould wall, whilst the total of the outlet bores (5) together form the water outlet (25), and at least one temperature sensor and a transmitter for the feed quantity per unit time is arranged in the cooling water inlet (24), and wherein temperature sensors (20) are arranged in addition in the water outlet region between a copper plate (1) and the cooling water outlet openings (5) of the water tank (7) per wide side plate at at least two locations, the signal lines of which sensors together with the signal lines of the temperature sensor of the water inlet are connected to a computer with an on-line display screen.
- Chill mould according to claim 1, characterised in that a thermo-coupling element containing temperature sensors is arranged in the region of at least each second outlet opening (5) and preferably fastened by silicon of type TP100 or that for each thermosensor a respective bore, which can be provided from the outside with a thermosensor, is formed in the water tank in the region of the outlet bore (5).
- Chill mould according to claim 1 or 2, characterised in that the temperature sensors (9) are arranged symmetrically relative to the centre axis of each chill mould wide side (1) as well as in casting direction.
- Chill mould according to one of the preceding claims 1 to 3, characterised in that the cooling water outlet openings (5) are uniformly distributed over the width of the wide side walls (1) and a respective temperature sensor is installed between each two outlet openings (5).
- Chill mould according to one of the preceding claims 1 to 4, characterised in that the water outlet openings (5) are arranged to be uniformly distributed between copper plate (1) and water tank (7) in the chill mould width and are each formed for the passage of a constant, equal water quantity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19722877 | 1997-05-31 | ||
| DE19722877A DE19722877C2 (en) | 1997-05-31 | 1997-05-31 | Liquid-cooled continuous casting mold |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0881018A2 EP0881018A2 (en) | 1998-12-02 |
| EP0881018A3 EP0881018A3 (en) | 1999-01-07 |
| EP0881018B1 true EP0881018B1 (en) | 2002-01-02 |
Family
ID=7831056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98109430A Expired - Lifetime EP0881018B1 (en) | 1997-05-31 | 1998-05-25 | Watercooled mould for continuous casting |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6152209A (en) |
| EP (1) | EP0881018B1 (en) |
| AT (1) | ATE211417T1 (en) |
| DE (2) | DE19722877C2 (en) |
| ES (1) | ES2170980T3 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19810672B4 (en) * | 1998-03-12 | 2006-02-09 | Sms Demag Ag | Method and continuous casting mold for producing slab strands, in particular of steel |
| DE59907176D1 (en) * | 1998-08-24 | 2003-11-06 | Sms Demag Ag | Method for measuring and regulating the temperature and quantity of cooling water for water-cooled mold walls of a continuous casting mold |
| EP1013362B1 (en) * | 1998-12-22 | 2003-06-25 | SMS Demag AG | Process and plant for continuous casting slabs |
| DE19916190C2 (en) * | 1998-12-22 | 2001-03-29 | Sms Demag Ag | Slab continuous casting method and apparatus |
| EP1070560B1 (en) * | 1999-07-17 | 2004-12-01 | SMS Demag AG | Process for regulating the cooling water flow rate through the broad side walls of a continuous casting mould |
| EP1149648B1 (en) * | 2000-04-25 | 2005-07-20 | SMS Demag AG | Process and device for the thermal control of a continuous casting mould |
| EP1193493A1 (en) * | 2000-09-29 | 2002-04-03 | Infineon Technologies SC300 GmbH & Co. KG | Method and apparatus for measuring and controlling the water content of a water containing liquid mixture |
| DE10329033A1 (en) * | 2003-06-27 | 2005-01-13 | Sms Demag Ag | Method and measuring arrangement for detecting nucleate boiling in the cooling channels of a continuous casting mold |
| 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 |
| DE102012224132B4 (en) * | 2012-12-21 | 2023-10-05 | Primetals Technologies Austria GmbH | Monitoring method for a continuous casting mold with construction of a database |
| 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 |
| CN113710031B (en) * | 2021-08-30 | 2023-08-11 | 无锡格林沃科技有限公司 | Main board control box outer body device and preparation method thereof |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH558687A (en) * | 1973-03-30 | 1975-02-14 | Concast Ag | PROCESS FOR CONTROLLING THE COOLING CAPACITY OF NARROW SIDE WALLS IN PLATE CHILLES DURING CONTINUOUS CASTING AND PLATE CHILLES FOR CARRYING OUT THE PROCESS. |
| AT337381B (en) * | 1973-04-17 | 1977-06-27 | Mannesmann Ag | METHOD FOR DETERMINING AND MONITORING THE SHELL THICKNESS AND SHELL GROWTH OF A STRAND |
| IT1021775B (en) * | 1974-10-11 | 1978-02-20 | Centro Speriment Metallurg | PROCESS AND DEVICE FOR THE CONTROL OF METAL MELTING UNDER ELECTROFUSED SLAG |
| JPS5653853A (en) * | 1979-10-05 | 1981-05-13 | Hitachi Ltd | Production of sheet and its apparatus |
| 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 |
| 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 |
| JPH0787976B2 (en) * | 1988-11-30 | 1995-09-27 | 川崎製鉄株式会社 | Online slab surface defect detection method |
| JPH02179344A (en) * | 1988-12-28 | 1990-07-12 | Hitachi Ltd | Belt type continuous casting machine and controlling method thereof |
| DE4117073A1 (en) * | 1991-05-22 | 1992-11-26 | Mannesmann Ag | TEMPERATURE MEASUREMENT SLAM CHOCOLATE |
| DE4323475C2 (en) * | 1993-07-14 | 1997-07-31 | Eisenmann Kg Maschbau | Monitoring procedure and monitoring device for its implementation |
| DE19529931C1 (en) * | 1995-08-02 | 1997-04-03 | Mannesmann Ag | Plate mold for the production of steel strands |
-
1997
- 1997-05-31 DE DE19722877A patent/DE19722877C2/en not_active Expired - Fee Related
-
1998
- 1998-05-21 US US09/082,884 patent/US6152209A/en not_active Expired - Fee Related
- 1998-05-25 EP EP98109430A patent/EP0881018B1/en not_active Expired - Lifetime
- 1998-05-25 DE DE59802779T patent/DE59802779D1/en not_active Expired - Lifetime
- 1998-05-25 AT AT98109430T patent/ATE211417T1/en not_active IP Right Cessation
- 1998-05-25 ES ES98109430T patent/ES2170980T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE19722877A1 (en) | 1998-12-03 |
| ATE211417T1 (en) | 2002-01-15 |
| EP0881018A3 (en) | 1999-01-07 |
| EP0881018A2 (en) | 1998-12-02 |
| US6152209A (en) | 2000-11-28 |
| DE59802779D1 (en) | 2002-02-28 |
| ES2170980T3 (en) | 2002-08-16 |
| DE19722877C2 (en) | 1999-09-09 |
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