EP1827735A1 - Method and device for continuous casting of metals - Google Patents

Method and device for continuous casting of metals

Info

Publication number
EP1827735A1
EP1827735A1 EP05850286A EP05850286A EP1827735A1 EP 1827735 A1 EP1827735 A1 EP 1827735A1 EP 05850286 A EP05850286 A EP 05850286A EP 05850286 A EP05850286 A EP 05850286A EP 1827735 A1 EP1827735 A1 EP 1827735A1
Authority
EP
European Patent Office
Prior art keywords
segments
nozzle
conveyor belt
nozzles
cooling
Prior art date
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.)
Granted
Application number
EP05850286A
Other languages
German (de)
French (fr)
Other versions
EP1827735B1 (en
Inventor
Jörg BAUSCH
Udo Falkenreck
Hans-Jürgen SCHEMEIT
Walter Weischedel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
SMS Demag AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SMS Demag AG filed Critical SMS Demag AG
Priority to PL05850286T priority Critical patent/PL1827735T3/en
Publication of EP1827735A1 publication Critical patent/EP1827735A1/en
Application granted granted Critical
Publication of EP1827735B1 publication Critical patent/EP1827735B1/en
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Anticipated expiration legal-status Critical

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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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0637—Accessories therefor
    • B22D11/068—Accessories therefor for cooling the cast product during its passage through the mould surfaces
    • B22D11/0685—Accessories therefor for cooling the cast product during its passage through the mould surfaces by cooling the casting belts
    • 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
    • B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
    • B22D11/0631—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars formed by a travelling straight surface, e.g. through-like moulds, a belt

Definitions

  • the invention relates to a method for the close - to - net casting of strands of metal, in particular rectangular strands, wherein liquid metal is poured onto a revolving conveyor belt, with subsequent inline rolling and an associated device.
  • liquid metal is poured through an opening in the wall of a horizontally movable supply hopper on the top of a horizontally circulating belt to solidify there. After solidification, the cast strip is passed directly to a rolling stand or rolling mill.
  • EP 1 077 782 B1 describes a method for casting rectangular rectangular strands of metal, in particular steel, and then inline rolling out of the strand, with a material supply container via whose outlet nozzle the liquid metal is applied to the upper strand of a conveyor belt, on which it solidifies and is passed on to a rolling stand for deformation, with the following steps: a) before the start of casting: aa) the delivery point of the liquid metal onto the conveyor belt is roughly specified) the conveying speed of the conveyor belt becomes dependent on the desired rolling thickness and Rolling speed of the rolling mill set.
  • a device for near-net shape casting of rectangular metal strands is known, in particular of steel, and then inline - rolling out of the strand, with an outlet nozzle having Metallzu 1500 actuallyer, a horizontally disposed conveyor belt and at least one subordinate mill, wherein the Materialzu 1500 suiter is connected to moving elements, with which this in horizontal, coaxial with the main axis of the conveyor belt in or against the conveying direction of the strand is movable and the Materialzu- supply container connected to an actuator, which is technically connected to a control device, to the measuring elements for detecting the position of the solidification of the strand and measuring elements for detecting the temperature of the rolling stock are connected.
  • the prior art thus includes a method or a device in which the point of delivery of the metal to the conveyor belt is locally fixed or locally variable.
  • the disadvantage of a locally fixed feed point is that the production spectrum is subject to a severe limitation. Only products with small changes in dimensions or material qualities can be manufactured. An improvement was achieved by a variable delivery point of the liquid metal on the conveyor belt. In such a method or such a device, however, there is the disadvantage that the cooling is not adapted to the variable conditions. It was recognized that the type of cooling and the position or spatial arrangement The cooling during strip casting, for example, influences the heat dissipation in such a way that there is a local overheating of the conveyor belt, which results in its failure. Furthermore, the effective heat transfer can be so low that sufficient solidification of the cast strip is achieved.
  • the invention is therefore based on the object of specifying a method and a device in which or in which the production window or the production spectrum is extended. This involves casting different metals and grades, casting different product thicknesses and widths, and a wide casting speed variance to avoid the above drawbacks.
  • the invention also relates to a device for carrying out the method according to the invention.
  • the decisive advantage of the method according to the invention is that the intensity of the cooling corresponding to the largest heat transfer is designed so that the greatest cooling effect is achieved at the point of the first contact of the liquid metal with the conveyor belt and decreases downstream.
  • the local variation of the feed point of the liquid metal on the conveyor belt in conjunction with an optimally adapted cooling or cooling arrangement a flexibilization of the production spectrum is achieved.
  • the point at which the liquid metal comes into contact with the conveyor belt must be changed under certain boundary conditions such as different metal qualities, mass flow rates and the like in the casting direction.
  • the intensity of the cooling is set by a local change of the cooling zone, seen in the transport direction.
  • the zone of the conveyor belt which has the greatest cooling intensity is therefore correlated with the location of the exit of the liquid metal from the feed tank.
  • a flexibilization of the effective cooling section or of the heat removal for expanding the production window is achieved. It can be poured more or less strongly to be cooled materials in various flow rates.
  • a first embodiment provides that the nozzles are combined in several independent units.
  • Each nozzle unit is assigned a separate pressure regulated water supply.
  • the pressure in the following nozzle units is gradually reduced. The highest pressure at the point of application of the liquid metal ensures that the greatest cooling effect is achieved here.
  • the pressure in the individual nozzle units is changed.
  • the pressure with which the cooling medium is injected at the individual nozzle units on the underside of the upper run of the conveyor belt remains constant.
  • the individual nozzle units are arranged so that the nozzle unit with the greatest cooling effect, ie the largest coolant flow, is always located where the liquid metal is applied to the conveyor belt. For this, the nozzle units are displaced or displaced locally.
  • the parameters conveyor belt speed and metal quantity / time are also changed.
  • the effective cooling length necessary for solidification is adapted to the metallurgical length.
  • This process is carried out in various situations as follows, assuming a uniform supply of the liquid metal to the conveyor belt.
  • V ⁇ r new Vir old + unit Z / l
  • Vj r is the speed of the conveyor belt and V E in h ei t z / i is the speed of the unit Z / 1.
  • the mass flow rate m is kept constant - on reaching the end position of the unit Z / 1, the conveyor belt speed v Tr is reduced again to the original value.
  • m is the mass flow rate
  • d is the thickness of the strand
  • b is the width of the strand
  • rho is the density of the liquid metal
  • v is the velocity of the Z / 1 unit.
  • V Tr new V Tr old V unit Z / 1
  • the mass flow rate m is kept constant. Upon reaching the end position of the unit Z / 1, the conveyor belt speed v Tr is increased again to the original value.
  • Type throughput of the plant e.g. Type throughput of the plant:
  • a metal feed container 1 for liquid metal 2 is arranged above a conveyor belt 3.
  • the conveyor belt 3 is deflected over two rollers 4 and 5. From an opening 6 in the metal feed container 1, liquid metal 2 reaches the upper side 7 of the upper run 8 of the conveyor belt 3. By a rotary movement of the rollers 4 and 5, the liquid metal 2 is led in the transport direction 9 to a rolling device (not shown).
  • the liquid metal 2 must have formed a strand shell of sufficient strength when it leaves the conveyor belt 3 in the region of the roller 5.
  • nozzles 11 are arranged in the region of the underside 10 of the upper run 8 of the conveyor belt 3. From the nozzles 11, a cooling medium such as water or the like is injected onto the underside 10 of the upper run 8.
  • the nozzles 11 are arranged, for example, in four nozzles - segments 12, 13, 14, 15.
  • Each nozzle segment 12, 13, 14, 15 has a separate pressure regulated water supply (not shown). This makes it possible that each nozzle segment 12, 13, 14, 15 can be subjected to different pressure.
  • the highest pressure of the cooling water or the cooling medium is provided where the largest amount of heat has to be dissipated. This location corresponds to the point at which the liquid metal 2 impinges on the top 7. In Figure 1a, this location is on the left side. Therefore, the nozzle segment 12 is for example subjected to a pressure of 8 bar. As seen in the transport direction 8, the amount of heat to be dissipated becomes smaller, the nozzle segment 13 is reduced Pressure of for example 6 bar, the nozzle segment 14 with 4 bar and the nozzle segment 15 applied with 3 bar.
  • the nozzles segment (in FIG. 1 b the nozzle segment and in FIG. 1 c the nozzle segments) which are located in front of the point at which the liquid metal 2 impinges on the top side 7 are also subjected to a reduced pressure.
  • the pressures are individually adjustable at any time and are influenced by the above-mentioned boundary conditions such as metal quality, mass flow rate, etc.
  • the cooling water or the cooling medium is supplied to the individual nozzle segments 16, 17, 18, 19, 20 under constant pressure.
  • the supply can be done centrally for all nozzles - segments 16, 17, 18, 19, 20 or decentralized for each individual.
  • the nozzles of the nozzle segments 16, 17, 18, 19, 20 are designed so that the cooling effect of the nozzle segments 16, 17, 18, 19, 20 is different. This can be achieved for example by different flow rates of the cooling medium.
  • the nozzle segment 16, 17, 18, 19, 20 with the highest cooling effect is arranged where the liquid metal 2 reaches the conveyor belt 3. Since this location varies, the nozzle segments 16, 17, 18, 19, 20 can be interchanged or offset. In Figure 2a, the highest cooling effect in the left nozzle segment 16 is reached. As seen in the transport direction 9, the cooling effect in the following nozzle segments 17, 18, 19, 20 decreases.
  • FIG. 2b the feeding point for the liquid metal 2 is shifted in the transport direction 9.
  • the nozzle segment 16 known from FIG. 2 a is likewise displaced in the transport direction 9.
  • the subsequent nozzle segments 17, 18, 19, 20 are each shifted by one parking space to the right.
  • FIG. 2c shows a shift around a further parking space.
  • the effective cooling length is adjusted to the metallurgical length.

Abstract

The invention relates to a method for close-to-final-dimension casting of billets made of metal, particularly rectangular billets, wherein molten metal ( 2 ) is cast onto a circulating transport belt ( 3 ), followed by in-line rolling and cooling of said transport belt ( 3 ). The invention also relates to a device for carrying out the inventive method.

Description

Verfahren und Vorrichtung zum Bandgießen von MetallenMethod and device for strip casting of metals
Die Erfindung betrifft ein Verfahren zum endabmessungsnahen Gießen von Strängen aus Metall, insbesondere rechteckigen Strängen, wobei flüssiges Metall auf ein umlaufendes Transportband gegossen wird, mit anschließendem Inline - Walzen sowie eine zugehörende Vorrichtung.The invention relates to a method for the close - to - net casting of strands of metal, in particular rectangular strands, wherein liquid metal is poured onto a revolving conveyor belt, with subsequent inline rolling and an associated device.
Beim Bandgießen wird flüssiges Metall durch eine Öffnung in der Wand eines horizontal beweglich angeordneten Zuführbehälters auf die Oberseite eines horizontal umlaufenden Bandes gegossen, um dort zu erstarren. Nach dem Erstarren wird das so gegossene Band direkt zu einem Walzgerüst oder einer Walzstraße geleitet.In strip casting, liquid metal is poured through an opening in the wall of a horizontally movable supply hopper on the top of a horizontally circulating belt to solidify there. After solidification, the cast strip is passed directly to a rolling stand or rolling mill.
In der EP 1 077 782 B1 wird ein Verfahren zum endabmessungsnahen Gießen von rechteckigen Strängen aus Metall beschrieben, insbesondere von Stahl, und anschließendem Inline - Auswalzen des Stranges, mit einem Materialzuführbehälter, über dessen Auslassdüse das flüssige Metall auf den Obertrum eines Förderbandes aufgegeben wird, auf dem es erstarrt und zur Verformung an ein Walzgerüst weitergegeben wird, mit den Schritten: a) vor Beginn des Gießens: aa) der Aufgabepunkt des flüssigen Metalls auf das Förderband wird grob vorgegeben ab) die Fördergeschwindigkeit des Förderbandes wird in Abhängigkeit der gewünschten Walzdicke und Walzgeschwindigkeit des Walzgerüstes eingestellt.EP 1 077 782 B1 describes a method for casting rectangular rectangular strands of metal, in particular steel, and then inline rolling out of the strand, with a material supply container via whose outlet nozzle the liquid metal is applied to the upper strand of a conveyor belt, on which it solidifies and is passed on to a rolling stand for deformation, with the following steps: a) before the start of casting: aa) the delivery point of the liquid metal onto the conveyor belt is roughly specified) the conveying speed of the conveyor belt becomes dependent on the desired rolling thickness and Rolling speed of the rolling mill set.
b) während des Gießens: ba) die Position der Durcherstarrung des auf dem Förderband befindlichenb) during casting: ba) the position of solidification on the conveyor belt
Metallstranges wird erfasst, bb) die Temperatur des Walzgutes wird im Bereich des Walzgerüstes er- fasst, und bc) die Position der Durcherstarrung und die Temperatur des Walzgutes werden als Steuergröße für die aktuelle Position des Aufgabepunktes des den Materialzuführbehälter verlassenden flüssigen Metalls auf das Förder- band verwendet.Metal strand is detected, bb) the temperature of the rolling stock is recorded in the area of the roll stand, and bc) the position of the solidification and the temperature of the rolling stock are used as a control variable for the current position of the delivery point of the liquid metal leaving the material supply container on the conveyor belt.
Aus diesem Dokument ist weiterhin eine Einrichtung zum endabmessungsna- hen Gießen von rechteckigen Strängen aus Metall bekannt, insbesondere von Stahl, und anschließendem Inline - Auswalzen des Stranges, mit einem eine Auslassdüse aufweisenden Metallzuführbehälter, einem horizontal angeordneten Förderband und mindestens einem diesem nachgeordneten Walzgerüst, wobei der Materialszuführbehälter mit Bewegungselementen verbunden ist, mit denen dieser in horizontaler, koaxial zur Hauptachse des Förderbandes in oder entgegen der Förderrichtung des Stranges bewegbar ist und der Materialzu- führbehälter an einen Aktuator angeschlossen, der regeltechnisch mit einer Regeleinrichtung verbunden ist, an die Messelemente zum Erfassen der Position der Durcherstarrung des Stranges und Messelemente zum Erfassen der Temperatur des Walzgutes angeschlossen sind.From this document, a device for near-net shape casting of rectangular metal strands is known, in particular of steel, and then inline - rolling out of the strand, with an outlet nozzle having Metallzuführbehälter, a horizontally disposed conveyor belt and at least one subordinate mill, wherein the Materialzuführbehälter is connected to moving elements, with which this in horizontal, coaxial with the main axis of the conveyor belt in or against the conveying direction of the strand is movable and the Materialzu- supply container connected to an actuator, which is technically connected to a control device, to the measuring elements for detecting the position of the solidification of the strand and measuring elements for detecting the temperature of the rolling stock are connected.
Zum Stand der Technik gehört somit ein Verfahren bzw. eine Vorrichtung, bei der die Aufgabestelle des Metalls auf das Transportband örtlich fest bzw. örtlich variabel ist.The prior art thus includes a method or a device in which the point of delivery of the metal to the conveyor belt is locally fixed or locally variable.
Nachteilig bei einer örtlich festen Aufgabestelle ist, dass hierbei das Produkti- onsspektrum einer starken Einschränkung unterliegt. Es können nur Produkte mit geringen Veränderungen in den Abmessungen oder Materialqualitäten gefertigt werden. Eine Verbesserung wurde durch einen variablen Aufgabepunkt des flüssigen Metalls auf das Transportband erreicht. Bei einem derartigen Verfahren bzw. einer derartigen Vorrichtung besteht aber der Nachteil, dass die Kühlung nicht an die variablen Rahmenbedingungen angepasst wird. Es wurde erkannt, dass die Art der Kühlung und die Position bzw. räumliche Anordnung der Kühlung beim Bandgießen die Wärmeabfuhr beispielsweise derart beein- flusst, dass es zu einer örtlichen Überhitzung des Transportbandes kommt, welche dessen Ausfall zur Folge hat. Weiterhin kann der effektive Wärmetransfer so gering sein, dass keine ausreichende Erstarrung des gegossenen Bandes erzielt wird.The disadvantage of a locally fixed feed point is that the production spectrum is subject to a severe limitation. Only products with small changes in dimensions or material qualities can be manufactured. An improvement was achieved by a variable delivery point of the liquid metal on the conveyor belt. In such a method or such a device, however, there is the disadvantage that the cooling is not adapted to the variable conditions. It was recognized that the type of cooling and the position or spatial arrangement The cooling during strip casting, for example, influences the heat dissipation in such a way that there is a local overheating of the conveyor belt, which results in its failure. Furthermore, the effective heat transfer can be so low that sufficient solidification of the cast strip is achieved.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren und eine Vorrichtung vorzugeben, bei dem bzw. bei der das Produktionsfenster bzw. das Herstellungsspektrum erweitert wird. Dieses beinhaltet das Gießen unterschiedlicher Metalle und Qualitäten, das Gießen unterschiedlicher Produktdicken und - breiten sowie eine breite Varianz der Gießgeschwindigkeit, um die oben angeführten Nachteile zu vermeiden.The invention is therefore based on the object of specifying a method and a device in which or in which the production window or the production spectrum is extended. This involves casting different metals and grades, casting different product thicknesses and widths, and a wide casting speed variance to avoid the above drawbacks.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass bei einem Verfahren gemäß dem Oberbegriff von Anspruch 1 das Transportband gekühlt wird.This object is achieved in that in a method according to the preamble of claim 1, the conveyor belt is cooled.
Weitere Ausgestaltungen des Verfahrens ergeben sich aus den diesbezüglichen Unteransprüchen.Further embodiments of the method will become apparent from the relevant subclaims.
Die Erfindung betrifft außerdem eine Vorrichtung zur Durchführung des erfin- dungsgemäßen Verfahrens.The invention also relates to a device for carrying out the method according to the invention.
Weitere Ausgestaltungen der Vorrichtung ergeben sich aus den diesbezüglichen Unteransprüchen.Further embodiments of the device will become apparent from the relevant subclaims.
Der entscheidende Vorteil des erfindungsgemäßen Verfahrens liegt darin, dass die Intensität der Kühlung entsprechend des größten Wärmetransports so ausgelegt ist, dass die größte Kühlwirkung an der Stelle des ersten Kontaktes des flüssigen Metalls mit dem Transportband erzielt wird und flussabwärts abnimmt. Durch die örtliche Variation der Aufgabestelle des flüssigen Metalls auf das Transportband in Verbindung mit einer optimal angepassten Kühlung bzw. Kühl -Anordnung wird eine Flexibilisierung des Produktionsspektrums erzielt. Die Stelle, an der das flüssige Metall in Kontakt mit dem Transportband kommt, muss unter bestimmten Randbedingungen wie unterschiedliche Metall - Qualitäten, Massendurchsätze und dergleichen in Gießrichtung verändert werden. Dazu wird die Intensität der Kühlung durch eine örtliche Veränderung der Kühl- zone, in Transportrichtung gesehen, eingestellt. Die Zone des Transportbandes, welche die größte Kühlintensivität aufweist, wird deshalb mit dem Ort des Austritts des flüssigen Metalls aus dem Zuführbehälter korreliert.The decisive advantage of the method according to the invention is that the intensity of the cooling corresponding to the largest heat transfer is designed so that the greatest cooling effect is achieved at the point of the first contact of the liquid metal with the conveyor belt and decreases downstream. The local variation of the feed point of the liquid metal on the conveyor belt in conjunction with an optimally adapted cooling or cooling arrangement, a flexibilization of the production spectrum is achieved. The point at which the liquid metal comes into contact with the conveyor belt must be changed under certain boundary conditions such as different metal qualities, mass flow rates and the like in the casting direction. For this purpose, the intensity of the cooling is set by a local change of the cooling zone, seen in the transport direction. The zone of the conveyor belt which has the greatest cooling intensity is therefore correlated with the location of the exit of the liquid metal from the feed tank.
Durch das erfindungsgemäße Verfahren und die erfindungsgemäße Vorrichtung wird eine Flexibilisierung der effektiven Kühlstrecke bzw. der Wärmeabfuhr zur Erweiterung des Produktionsfensters erreicht. Es können so mehr oder weniger stark zu kühlende Materialien in verschiedensten Durchsätzen vergossen werden.By means of the method according to the invention and the device according to the invention, a flexibilization of the effective cooling section or of the heat removal for expanding the production window is achieved. It can be poured more or less strongly to be cooled materials in various flow rates.
Eine erste Ausführungsform sieht vor, dass die Düsen in mehreren unabhängigen Einheiten zusammengefasst werden. Jeder Düsen - Einheit ist eine separate Druck geregelte Wasserzufuhr zugeordnet. Bei einer derartigen Vorrichtung ist der Druck, mit dem das Kühlmedium gegen die Unterseite des Obertrums des Transportbandes gespritzt wird, jeweils an der Stelle am Höchsten, an der das flüssige Metall auf die Oberseite des Obertrums des Transportbandes aufgegeben wird. In Transportrichtung gesehen wird der Druck in den nachfolgenden Düsen - Einheiten beispielsweise schrittweise verringert. Durch den höchsten Druck an der Aufgabestelle des flüssigen Metalls wird erreicht, dass hier die größte Kühlwirkung erzielt wird.A first embodiment provides that the nozzles are combined in several independent units. Each nozzle unit is assigned a separate pressure regulated water supply. In such a device, the pressure with which the cooling medium is injected against the underside of the upper strand of the conveyor belt, respectively at the highest point at which the liquid metal is placed on top of the upper strand of the conveyor belt. In the transport direction, for example, the pressure in the following nozzle units is gradually reduced. The highest pressure at the point of application of the liquid metal ensures that the greatest cooling effect is achieved here.
Bei der ersten Ausführungsform wird der Druck in den einzelnen Düsen - Einheiten verändert.In the first embodiment, the pressure in the individual nozzle units is changed.
Bei einer zweiten Ausführungsform bleibt der Druck, mit dem das Kühlmedium bei den einzelnen Düsen - Einheiten auf die Unterseite des Obertrums des Transportbandes gespritzt wird, konstant. Die einzelnen Düsen - Einheiten werden dabei so angeordnet, dass die Düsen - Einheit mit der größten Kühlwirkung, also dem größten Kühlmitteldurchfluss, immer dort angeordnet ist, wo das flüssige Metall auf das Transportband aufgegeben wird. Hierzu werden die Düsen - Einheiten örtlich versetzt bzw. verschoben.In a second embodiment, the pressure with which the cooling medium is injected at the individual nozzle units on the underside of the upper run of the conveyor belt, remains constant. The individual nozzle units are arranged so that the nozzle unit with the greatest cooling effect, ie the largest coolant flow, is always located where the liquid metal is applied to the conveyor belt. For this, the nozzle units are displaced or displaced locally.
Um am Ende des Transportbandes ein erstarrtes Band zu erhalten, werden weiterhin die Parameter Transportbandgeschwindigkeit und Metallmenge / Zeit verändert. Die zur Erstarrung notwendige effektive Kühllänge wird der metallurgischen Länge angepasst.In order to obtain a solidified belt at the end of the conveyor belt, the parameters conveyor belt speed and metal quantity / time are also changed. The effective cooling length necessary for solidification is adapted to the metallurgical length.
Dieser Vorgang wird in verschiedenen Situationen wie folgt ausgeführt, wobei eine gleichmäßige Zuführung des flüssigen Metalls zum Transportband vorausgesetzt wird.This process is carried out in various situations as follows, assuming a uniform supply of the liquid metal to the conveyor belt.
Verkürzung der effektiven Kühllänge während des GießprozessesShortening the effective cooling length during the casting process
Fall 1 : Die Relativ - Geschwindigkeit zwischen der Einheit Z / 1 und dem Transportband wird konstant gehalten. Die Geschwindigkeit des Transportbandes vTr muss um den Betrag der horizontalen Geschwindigkeit der Einheit Z / 1 angehoben werden:Case 1: The relative speed between the unit Z / 1 and the conveyor belt is kept constant. The speed of the conveyor belt v Tr must be increased by the amount of the horizontal speed of the unit Z / 1:
Vτr neu = Vir alt + VeinheitZ/ lVτr new = Vir old + unit Z / l
Dabei bedeuten Vjr die Geschwindigkeit des Transportbandes und VEinheitz/i die Geschwindigkeit der Einheit Z / 1.Where Vj r is the speed of the conveyor belt and V E in h ei t z / i is the speed of the unit Z / 1.
Der Massendurchsatz m wird konstant gehalten - bei Erreichen der Endposition der Einheit Z / 1 wird die Transportbandgeschwindigkeit vTr wieder auf den ursprünglichen Wert verringert.The mass flow rate m is kept constant - on reaching the end position of the unit Z / 1, the conveyor belt speed v Tr is reduced again to the original value.
Fall 2: Die Transportbandgeschwindigkeit vTr wird konstant gehalten. Die Metallzuführung muss um den Betrag m = d * b * rho * v Einheitz/ 1 in ( t/min)Case 2: The conveyor belt speed v Tr is kept constant. The metal feed must be around the amount m = d * b * rho * v one hour / 1 in (t / min)
gedrosselt werden. Dabei bedeuten m den Massendurchsatz, d die Dicke des Stranges, b die Breite des Stranges, rho die Dichte des flüssigen Metalls und v die Geschwindigkeit der Einheit Z / 1.be throttled. Where m is the mass flow rate, d is the thickness of the strand, b is the width of the strand, rho is the density of the liquid metal, and v is the velocity of the Z / 1 unit.
Bei Erreichen der Endposition der Einheit Z / 1 wird der Durchsatz m wieder auf den ursprünglichen Wert erhöht.When the end position of the unit Z / 1 is reached, the throughput m is increased again to the original value.
Verlängern der effektiven Kühllänge während des GießprozessesExtend the effective cooling length during the casting process
Fall 3: Die Relativ - Geschwindigkeit zwischen der Einheit Z / 1 und dem Trans- portband wird konstant gehalten. Die Geschwindigkeit des Transportbandes muss um den Betrag der horizontalen Geschwindigkeit der Einheit Z / 1 verringert werden:Case 3: The relative speed between the unit Z / 1 and the conveyor belt is kept constant. The speed of the conveyor belt must be reduced by the amount of the horizontal speed of the unit Z / 1:
V Tr neu = V Tr alt " V Einheit Z/ 1V Tr new = V Tr old V unit Z / 1
Der Massendurchsatz m wird konstant gehalten. Bei Erreichen der Endposition der Einheit Z / 1 wird die Transportbandgeschwindigkeit vTr wieder auf den ursprünglichen Wert erhöht.The mass flow rate m is kept constant. Upon reaching the end position of the unit Z / 1, the conveyor belt speed v Tr is increased again to the original value.
Fall 4: Die Transportbandgeschwindigkeit Vτr wird konstant gehalten. Die Metallzuführung muss um den BetragCase 4: The conveyor belt speed Vτ r is kept constant. The metal feed must be around the amount
m = d * b * rho * v Einheit z/ι ( t/min )m = d * b * rho * v h eit z / ι (t / min)
vergrößert werden. Bei Erreichen der Endposition der Einheit Z / 1 wird der Durchsatz m wieder auf den ursprünglichen Wert verringert. Nachfolgend sind die erläuterten Vorgänge grafisch dargestelltbe enlarged. When the end position of the unit Z / 1 is reached, the throughput m is reduced again to the original value. The illustrated operations are shown graphically below
z.B. typ. Transportbandgeschwindigkeit vTr : 40 m / min VBnheitz/i : 10 m / mineg typ. conveyor belt speed v Tr : 40 m / min Vbnheitz / i: 10 m / min
Fall 1 : vTr = 50 m / minCase 1: v Tr = 50 m / min
Fall 3 : vTr = 30 m / minCase 3: v Tr = 30 m / min
z.B. typ. Durchsatz der Anlage:e.g. Type throughput of the plant:
m = 0,012 m * 1 ,3 m * 7,6 t/m3 * 40 m / min = 4,7 t/minm = 0.012 m * 1, 3 m * 7.6 t / m 3 * 40 m / min = 4.7 t / min
VEinheitz/i = 10 m/min → Δm = 1 ,2 t/minUnit / i = 10 m / min → Δm = 1, 2 t / min
Fall 2: m = 3,5 t/minCase 2: m = 3.5 t / min
Fall 4 : m = 5,9 t/minCase 4: m = 5.9 t / min
Ausführungsbeispiele der Erfindung werden anhand von sehr schematischen Zeichnungen näher beschrieben. Es zeigen:Embodiments of the invention will be described in more detail with reference to very schematic drawings. Show it:
Fig. 1 eine Bandgießanlage mit einer Druck - Regelung der Düsen -1 a strip caster with a pressure - control of the nozzles -
Segmente, wobei ein Metallzuführbehälter in unterschiedlichen Positionen ( 1a, 1 b, 1 c ) angeordnet ist und Fig. 2 eine Bandgießanlage mit auswechselbaren Düsen - Segmenten, wobei ein Metallzuführbehälter in unterschiedlichen Positionen ( 2a, 2b, 2c ) angeordnet ist.Segments, wherein a Metallzuführbehälter in different positions (1a, 1 b, 1 c) is arranged and 2 shows a strip casting plant with interchangeable nozzle segments, wherein a metal feed tank is arranged in different positions (2a, 2b, 2c).
In den Figuren 1a, 1 b, 1c ist ein Metallzuführbehälter 1 für flüssiges Metall 2 oberhalb eines Transportbandes 3 angeordnet. Das Transportband 3 wird über zwei Rollen 4 und 5 umgelenkt. Aus einer Öffnung 6 im Metallzuführbehälter 1 gelangt flüssiges Metall 2 auf die Oberseite 7 des oberen Trums 8 des Transportbandes 3. Durch eine Drehbewegung der Rollen 4 und 5 wird das flüssige Metall 2 in Transportrichtung 9 zu einer nicht dargestellten Walzvorrichtung ge- leitet.In FIGS. 1 a, 1 b, 1 c, a metal feed container 1 for liquid metal 2 is arranged above a conveyor belt 3. The conveyor belt 3 is deflected over two rollers 4 and 5. From an opening 6 in the metal feed container 1, liquid metal 2 reaches the upper side 7 of the upper run 8 of the conveyor belt 3. By a rotary movement of the rollers 4 and 5, the liquid metal 2 is led in the transport direction 9 to a rolling device (not shown).
Dabei muss das flüssige Metall 2 eine Strangschale ausreichender Festigkeit gebildet haben, wenn es das Transportband 3 im Bereich der Rolle 5 verlässt. Zur Abkühlung des Transportbandes 3 und somit auch zur Abkühlung des flüs- sigen Metalls 2 sind im Bereich der Unterseite 10 des oberen Trums 8 des Transportbandes 3 Düsen 11 angeordnet. Aus den Düsen 11 wird ein Kühlmedium wie Wasser oder dergleichen auf die Unterseite 10 des oberen Trums 8 gespritzt.In this case, the liquid metal 2 must have formed a strand shell of sufficient strength when it leaves the conveyor belt 3 in the region of the roller 5. For cooling the conveyor belt 3 and thus also for cooling the liquid metal 2, nozzles 11 are arranged in the region of the underside 10 of the upper run 8 of the conveyor belt 3. From the nozzles 11, a cooling medium such as water or the like is injected onto the underside 10 of the upper run 8.
Die Düsen 11 sind beispielsweise in vier Düsen - Segmente 12, 13, 14, 15angeordnet. Jedes Düsen - Segment 12, 13, 14, 15 weist eine separate Druck geregelte Wasserzufuhr ( nicht dargestellt ) auf. Hierdurch wird ermöglicht, dass jedes Düsen - Segment 12, 13, 14, 15 mit unterschiedlichem Druck beaufschlagt werden kann. Der höchste Druck des Kühlwassers bzw. des Kühlmediums ist dort vorgesehen, wo die größte Wärmemenge abgeführt werden muss. Dieser Ort entspricht der Stelle, an dem das flüssige Metall 2 auf die Oberseite 7 auftrifft. In Figur 1a befindet sich dieser Ort an der linken Seite. Daher wird das Düsen - Segment 12 beispielsweise mit einem Druck von 8 bar beaufschlagt. Da in Transportrichtung 8 gesehen die abzuführende Wärme- menge kleiner wird, wird das Düsen - Segment 13 mit einem verminderten Druck von beispielsweise 6 bar, das Düsen - Segment 14 mit 4 bar und das Düsen - Segment 15 mit 3 bar beaufschlagt.The nozzles 11 are arranged, for example, in four nozzles - segments 12, 13, 14, 15. Each nozzle segment 12, 13, 14, 15 has a separate pressure regulated water supply (not shown). This makes it possible that each nozzle segment 12, 13, 14, 15 can be subjected to different pressure. The highest pressure of the cooling water or the cooling medium is provided where the largest amount of heat has to be dissipated. This location corresponds to the point at which the liquid metal 2 impinges on the top 7. In Figure 1a, this location is on the left side. Therefore, the nozzle segment 12 is for example subjected to a pressure of 8 bar. As seen in the transport direction 8, the amount of heat to be dissipated becomes smaller, the nozzle segment 13 is reduced Pressure of for example 6 bar, the nozzle segment 14 with 4 bar and the nozzle segment 15 applied with 3 bar.
Auch die vor der Stelle, an dem das flüssige Metall 2 auf die Oberseite 7 auftrifft, angeordneten Düsen - Segment ( in Figur 1 b das Düsen - Segment und in Figur 1c die Düsen - Segmente ) werden mit einem verminderten Druck beaufschlagt.The nozzles segment (in FIG. 1 b the nozzle segment and in FIG. 1 c the nozzle segments) which are located in front of the point at which the liquid metal 2 impinges on the top side 7 are also subjected to a reduced pressure.
Die Drücke sind jederzeit einzeln einstellbar und werden durch die oben genannten Randbedingungen wie Metall - Qualität, Massendurchsatz usw. beein- flusst.The pressures are individually adjustable at any time and are influenced by the above-mentioned boundary conditions such as metal quality, mass flow rate, etc.
Bei der in den Figuren 2a, 2b, 2c dargestellten erfindungsgemäßen Vorrichtung wird das Kühlwasser bzw. das Kühlmedium unter konstantem Druck den einzelnen Düsen - Segmenten 16, 17, 18, 19, 20 zugeführt. Die Zuführung kann dabei zentral für alle Düsen - Segmente 16, 17, 18, 19, 20 erfolgen oder dezentral für jede einzelne. Die Düsen der Düsen - Segmente 16, 17, 18, 19, 20 sind dabei so ausgelegt, dass die Kühlwirkung der Düsen - Segmente 16, 17, 18, 19, 20 unterschiedlich ist. Dieses kann beispielsweise durch unterschiedliche Durchsatzmengen des Kühlmediums erreicht werden.In the device according to the invention shown in FIGS. 2a, 2b, 2c, the cooling water or the cooling medium is supplied to the individual nozzle segments 16, 17, 18, 19, 20 under constant pressure. The supply can be done centrally for all nozzles - segments 16, 17, 18, 19, 20 or decentralized for each individual. The nozzles of the nozzle segments 16, 17, 18, 19, 20 are designed so that the cooling effect of the nozzle segments 16, 17, 18, 19, 20 is different. This can be achieved for example by different flow rates of the cooling medium.
Erfindungsgemäß wird das Düsen - Segment 16, 17, 18, 19, 20 mit der höchsten Kühlwirkung dort angeordnet, wo das flüssige Metall 2 auf das Transportband 3 gelangt. Da diese Stelle variiert, können die Düsen - Segmente 16, 17, 18, 19, 20 vertauscht bzw. versetzt werden. In Figur 2a wird die höchste Kühl- Wirkung im linken Düsen - Segment 16 erreicht. In Transportrichtung 9 gesehen verringert sich die Kühlwirkung in den nachfolgenden Düsen - Segmenten 17, 18, 19, 20.According to the invention, the nozzle segment 16, 17, 18, 19, 20 with the highest cooling effect is arranged where the liquid metal 2 reaches the conveyor belt 3. Since this location varies, the nozzle segments 16, 17, 18, 19, 20 can be interchanged or offset. In Figure 2a, the highest cooling effect in the left nozzle segment 16 is reached. As seen in the transport direction 9, the cooling effect in the following nozzle segments 17, 18, 19, 20 decreases.
In Figur 2b ist die Aufgabestelle für das flüssige Metall 2 in Transportrichtung 9 verschoben. Um hier die größte Kühlwirkung zu erzielen, wird das aus Figur 2 a bekannte Düsen - Segment 16 ebenfalls in Transportrichtung 9 verschoben. Um ein gleichmäßiges Gefälle bei der Kühlwirkung zu erreichen, werden die nachfolgenden Düsen - Segmente 17, 18, 19, 20 jeweils um einen Stellplatz nach rechts verschoben. In Figur 2c ist eine Verschiebung um einen weiteren Stellplatz dargestellt.In Figure 2b, the feeding point for the liquid metal 2 is shifted in the transport direction 9. In order to achieve the greatest cooling effect here, the nozzle segment 16 known from FIG. 2 a is likewise displaced in the transport direction 9. In order to achieve a uniform gradient in the cooling effect, the subsequent nozzle segments 17, 18, 19, 20 are each shifted by one parking space to the right. FIG. 2c shows a shift around a further parking space.
Bei Veränderung der Parameter Transportgeschwindigkeit und Metallmenge / Zeit, welche wie oben beschrieben durchgeführt wird, wird die effektive Kühllänge so an die metallurgische Länge angepasst. When changing the parameters transport speed and metal amount / time, which is carried out as described above, the effective cooling length is adjusted to the metallurgical length.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1. Metallzuführbehälter1. Metal feed tank
2. flüssiges Metall2. liquid metal
3. Transportband3. conveyor belt
4. Rolle4th role
5. Rolle5th role
6. Öffnung6. opening
7. Oberseite7. top
8. oberer Trum8th upper strand
9. Transportrichtung9. Transport direction
10. Unterseite10. Bottom
11. Düsen11. Nozzles
12. - 20. Düsen - Segment 12. - 20. Nozzle segment

Claims

Patentansprüche claims
1. Verfahren zum endabmessungsnahen Gießen von Strängen aus Metall, insbesondere rechteckigen Strängen, wobei flüssiges Metall (2) auf ein umlaufendes Transportband (3) gegossen wird, mit anschließendem Inline - Walzen, dadurch gekennzeichnet, dass das Transportband (3) gekühlt wird1. A method for close to final dimension casting of strands of metal, in particular rectangular strands, wherein liquid metal (2) is cast on a revolving conveyor belt (3), followed by inline rolling, characterized in that the conveyor belt (3) is cooled
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass das Transportband (3) an der Stelle, an der das flüssige Metall auf die Oberseite (7) des oberen Trums (8) aufgegeben wird, am stärksten gekühlt wird bzw. die größte Wärmemenge abgeführt wird.2. The method according to claim 1, characterized in that the conveyor belt (3) at the point at which the liquid metal on the top (7) of the upper run (8) is abandoned, is cooled most or dissipated the largest amount of heat becomes.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kühlung durch Aufspritzen von Kühlmedien bzw. Kühlwasser mittels Düsen (11) auf die Unterseite (10) eines oberen Trums (8) des Transportbandes (3) erfolgt.3. The method according to claim 1 or 2, characterized in that the cooling by spraying cooling media or cooling water by means of nozzles (11) on the underside (10) of an upper run (8) of the conveyor belt (3).
4. Verfahren nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass die Düsen (11) zu Düsen - Segmenten ( 12 - 20 ) zusammengefügt werden.4. The method of claim 1, 2 or 3, characterized in that the nozzles (11) to nozzle segments (12 - 20) are joined together.
5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Düsen (11) in den Düsen - Segmenten (12 - 15 ) unterschiedli- che Drücke aufweisen. 5. The method according to any one of claims 1 to 4, characterized in that the nozzles (11) in the nozzle - segments (12 - 15) have different pressures.
6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Düsen (11 ) in den Düsen - Segmenten (16 - 20) den gleichen Druck aufweisen.6. The method according to any one of claims 1 to 4, characterized in that the nozzles (11) in the nozzle - segments (16 - 20) have the same pressure.
7. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Durchflussmenge des Kühlmediums bzw. Kühlwassers in den einzelnen Düsen - Segmenten (12 - 20) verändert wird.7. The method according to any one of claims 1 to 4, characterized in that the flow rate of the cooling medium or cooling water in the individual nozzle - segments (12 - 20) is changed.
8. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet dass die Durchflussmenge des Kühlmediums bzw. des Kühlwassers in den einzelnen Düsen - Segmenten (12 - 20) konstant eingestellt wird.8. The method according to any one of claims 1 to 4, characterized in that the flow rate of the cooling medium or the cooling water in the individual nozzle - segments (12 - 20) is set constant.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass der Massendurchsatz m konstant gehalten wird.9. The method according to any one of claims 1 to 8, characterized in that the mass flow rate m is kept constant.
10. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Transportgeschwindigkeit vγr konstant gehalten wird.10. The method according to any one of claims 1 to 8, characterized in that the transport speed vγ r is kept constant.
11. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Metallzuführung gedrosselt oder vergrößert wird.11. The method according to any one of claims 1 to 8, characterized in that the metal supply is throttled or increased.
12. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass die Transportgeschwindigkeit vτr verringert oder angehoben wird. 12. The method according to any one of claims 1 to 8, characterized in that the transport speed vτ r is reduced or increased.
13. Vorrichtung zum endabmessungsnahen Gießen von Strängen aus Metall, insbesondere rechteckigen Strängen, wobei flüssiges Metall (2) auf ein umlaufendes Transportband (3) gegossen wird, welches um zwei Rollen (4, 5) läuft und einen oberen Trum (8) mit einer Oberseite (7) und einer Unterseite (10) aufweist und einer anschließenden Walzvorrich- tung, dadurch gekennzeichnet, dass unter der Unterseite (10) Düsen (11) angeordnet sind.13. Device for near-net-shape casting of strands of metal, in particular rectangular strands, wherein liquid metal (2) is poured onto a revolving conveyor belt (3) which runs around two rollers (4, 5) and an upper run (8) with a Having top (7) and a bottom (10) and a subsequent Walzvorrich- device, characterized in that below the bottom (10) nozzles (11) are arranged.
14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Düsen (11 ) in Düsen - Segmenten (12 - 20) angeordnet sind.14. The device according to claim 13, characterized in that the nozzles (11) in nozzle - segments (12 - 20) are arranged.
15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass die Düsen (11) in den einzelnen Düsen - Segmenten (12 - 20) unterschiedlich im Durchsatz sind.15. The apparatus according to claim 14, characterized in that the nozzles (11) in the individual nozzle - segments (12 - 20) are different in throughput.
16. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass die Düsen (11) in den einzelnen Düsen - Segmenten (12 - 20) i- dentisch sind.16. Device according to claim 13, characterized in that the nozzles (11) in the individual nozzle segments (12-20) are identical.
17. Vorrichtung nach einem der Anspruch 12 bis 16, dadurch gekennzeichnet, dass die Düsen - Segmente (12 - 15) jeweils eine separate Druck geregelte Kühlmedium bzw. Kühlwasser aufweisen.17. Device according to one of claims 12 to 16, characterized in that the nozzle segments (12-15) each have a separate pressure-controlled cooling medium or cooling water.
18. Vorrichtung nach einem der Ansprüche 12 bis 16, dadurch gekennzeichnet, dass die Düsen - Segmente (16 - 20) austauschbar angeordnet sind. 18. Device according to one of claims 12 to 16, characterized in that the nozzle - segments (16 - 20) are arranged exchangeably.
EP05850286A 2004-12-18 2005-12-16 Method and device for continuous casting of metals Not-in-force EP1827735B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (2)

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DE102004061080A DE102004061080A1 (en) 2004-12-18 2004-12-18 Method and device for strip casting of metals
PCT/EP2005/013571 WO2006063847A1 (en) 2004-12-18 2005-12-16 Method and device for continuous casting of metals

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EP1827735A1 true EP1827735A1 (en) 2007-09-05
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AT (1) ATE414579T1 (en)
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DE102017221095A1 (en) * 2016-11-29 2018-05-30 Sms Group Gmbh Caster casting machine and method for producing a cast metal from liquid metal

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DE102004061080A1 (en) 2006-06-22
JP2008531281A (en) 2008-08-14
ES2314751T3 (en) 2009-03-16
EP1827735B1 (en) 2008-11-19
DE502005006026D1 (en) 2009-01-02
ATE414579T1 (en) 2008-12-15
AU2005315789A1 (en) 2006-06-22
PL1827735T3 (en) 2009-04-30

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