WO2002038309A1 - Device and method for continuously casting a metal strip in the casting gap between a pair of rollers which can move in a rotating manner and which can form a mould - Google Patents
Device and method for continuously casting a metal strip in the casting gap between a pair of rollers which can move in a rotating manner and which can form a mould Download PDFInfo
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- WO2002038309A1 WO2002038309A1 PCT/EP2001/012851 EP0112851W WO0238309A1 WO 2002038309 A1 WO2002038309 A1 WO 2002038309A1 EP 0112851 W EP0112851 W EP 0112851W WO 0238309 A1 WO0238309 A1 WO 0238309A1
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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
- B22D11/06—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
- B22D11/0648—Casting surfaces
- B22D11/066—Side dams
Definitions
- the invention relates to a device for the continuous casting of a metal strip, preferably in the thickness range between 1 and 10 mm, in particular a steel strip, between two in the casting direction with one another to form the wide side walls of the metal strip in the manner of a circumferentially movable mold with radially spaced coolable rollers, which are between them Limit the casting gap, the end faces of the casting gap and the rollers having adjustable and / or adjustable sealing elements.
- Document WO 00/40355 describes plates made of refractory material for the end face sealing of casting machines in continuous operation, comprising two counter-rotating rollers with two or more overlapping layers made of ceramic and / or refractory material.
- the first layer consists of a material which is comparatively easily worn during operation of the rollers, in particular during start-up operation, whereas the second layer underlaid with the first layer consists of ceramic and / or heat-resistant and / or carbon material has high resistance to heat and abrasion and has self-lubricating properties.
- Document EP 0 714 716 B1 discloses a device for the continuous casting of molten steel between two counter-rotating rolls with parallel axes, which define a casting space between them, and comprises a cover which is arranged above the casting space and has two longitudinal walls, each along the Extend the surface of each roller and are provided with gas supply lines which have openings which open to these surfaces.
- Each wall has means for sealing by pressure loss in order to prevent pressure loss in a zone between the wall and the surface of the corresponding roller and between two of the lines, so that the gas stream which is supplied from the line which is upstream with respect to the direction of rotation of the roller is directed to the outside of the cover, and the gas stream which is supplied from the line, which is downstream, is deflected to the casting room.
- the means for sealing by pressure loss are formed by a projection of the wall which extends between the lines in the immediate vicinity of the surface of the roller.
- the means for sealing by pressure loss can have longitudinal grooves which are arranged parallel to the lines.
- Document WO 99/48 635 describes a process for the continuous casting of a thin strip, in particular a steel strip, preferably with a thickness of less than 10 mm, in the two-roll process, metal melt in a casting gap formed by two casting rolls in the thickness of the strip to be cast is poured to form a melt pool and the surfaces of the casting rolls above the melt pool are flushed with an inert gas or an inert gas mixture.
- the gas purging of the surfaces of the casting rolls is carried out locally differently over the longitudinal extent of the casting rolls.
- the local differences can be gas compositions, gas quantities or gas pressures. Locally different states of the surface roughness of the casting rolls or the surface reflection properties of the casting rolls or locally different discoloration of the surfaces of the casting rolls can also be observed.
- the surfaces of the casting rolls are divided into zones arranged one behind the other in the direction of their longitudinal extent. Each zone is observed for the condition of the surfaces.
- the locally different gas purging is carried out zone by zone, ie with uniform and uniform gas purging within each zone.
- WO 93/22 087 describes a continuous caster with steam extraction.
- a pair of suction scoops create a negative pressure above the surface of the cast room.
- the suction hoods are provided with closing elements that close off a space above the melting bath.
- Cleaning gas for example argon, is introduced into the closed space through nozzles, in two streams, which flow down over the surfaces of the casting rolls towards the surface of the molten bath.
- the invention has for its object to provide a device for the continuous casting of a metal strip with two radially spaced coolable rollers which delimit a casting gap between them, the end faces of the casting gap and the rollers adjustable and / or adjustable
- sealing elements that provide a reliable seal, causing only very little wear on the end faces of the casting rollers and the sealing elements, reliably prevent melt from sticking to the sealing elements or parts thereof, and in particular result in an uncomplicated design of the sealing elements and their positioning devices.
- each sealing element each has an essentially parallel front and rear wall with each other firmly connected edge areas between them in the manner of a Pocket form a gas-pressurized cavity, which can be connected to a supply line for inert compressed gas, and that the front wall of each sealing element, which can be placed on the end faces of the rollers as an end face seal of the casting gap, consists of a refractory, gas-permeable material.
- an ascending gas cushion builds up on the side of the end sealing element that comes into direct contact with the melt due to the porosity of the material of the front wall, with which the rotating end face of the adjacent casters contacts with reduced contact pressure and thus both sticking of the melt the front wall of the sealing element prevents as well as an optimal sealing of the casting space between the rollers is made possible without disadvantageous abrasion.
- the cavity can be formed by the porous, fire-proof side seal on the roller side and by the supporting and adjustable support elements.
- FIG. 1 shows a device according to the invention for the continuous casting of a comparatively narrow metal strip in a front view of the casting rolls;
- Figure 2 shows the device of FIG. 1 in side view.
- Figure 1 shows a device for the continuous casting of a metal strip 13, in particular a steel strip, with two coolable rollers 6 arranged in the casting direction with one another to form the broad side of the metal strip in the manner of a circumferentially movable mold, which delimit a casting gap 7 between them, the End faces of the casting gap 7 and the rollers 6 adjustable and / or adjustable sealing elements 5 on sen.
- the roll casting machine preferably produces steel strips in the thickness range between 1 and 10 mm.
- Each sealing element 5 has a front wall 10 or rear wall 11, which is essentially parallel to one another at a distance from one another, with edge regions 14 which are firmly connected to one another and which form a gas-pressurized cavity 8 between them in the manner of a pocket.
- the cavity 8 can be connected to a feed line 9 for inert compressed gas.
- the front wall 10 of each sealing element 5, which can be placed on the end faces 12 of the rollers 6 as the end face seal 5 of the casting gap 7, consists of a refractory, gas-permeable material.
- the gas-permeable refractory material forms a porous front wall 10 with an essentially uniform arrangement of pores over its surface.
- the size and / or the number of gas-permeable pores is adapted to the casting parameters via the height of the side seal in accordance with the ferrostatic pressure, taking into account the volume expansion due to the temperature increase of the inert gas.
- the gas-permeable, refractory wall 10 consists of a pile of refractory material particles which are connected to one another by sintering under high pressure and high temperature to form a solid shaped structure which has a multiplicity of fine pores.
- the porous, refractory material can preferably be a sintered metal, in particular a sintered steel.
- a sintered metal has, in particular, self-lubricating, friction-reducing sliding properties. It can consist of sintered stainless steel particles.
- the porosity of the front wall 10 is approximately limited to the area wetted by liquid melt and the contact area to the end face of the casting roll.
- the number and size of the pores in the contact area to the end face of the casting roll is preferably greater than in the pouring area.
- the boundary between the front wall 10 and the non-porous part of the sealing element 5 is shown in FIG. 1 by a line 10 indicated in points.
- an area-related volume flow and the working pressure of the inert gas are set in accordance with the casting parameters such as steel quality, cross-sectional area of the casting, casting speed and casting temperature.
- the continuous casting plant has, in a manner known per se, a ladle 1 with a pouring tube 2 for the controlled transfer of melt into the rewinder 3, from which melt is introduced in a controlled flow into the pouring gap 7 between the rollers 6 with the aid of at least one dip tube 4 ,
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Abstract
The invention relates to a device for continuously casting a metal strip (13), preferably having a thickness of between 1 and 10 mm, especially a steel strip. Said device comprises two coolable, radially interspaced rollers (6) which are arranged together in the casting direction in order to form the broad side of the metal strip, like a mould which can be moved in a rotating manner. The rollers (6) define a casting gap (7) between each other, the front sides of the casting gap (7) and the rollers (6) comprising adjustable sealing elements (5). In order to improve the seal, each sealing element (5) respectively comprises a front wall (10) and a rear wall (11) which are essentially parallel and arranged at a distance from each other, having edge areas (14) which are connected to each other in a fixed manner and which form a cavity (8) between each other in the shape of a pouch. Said cavity (8) is subjected to gas pressure and can be connected to a supply line (9) for an inert pressurised gas. The front wall (10) of each sealing element (5) which can be applied to the front sides (12) of the rollers (6), for sealing the front sides of the casting gap (7), consists of a fire-proof, gas-permeable material.
Description
Vorrichtung und Verfahren zum Stranggießen eines Metallbandes im Gießspalt zwischen einem Paar umlaufend bewegbaren, eine Kokille ausbildbaren RollenDevice and method for the continuous casting of a metal strip in the casting gap between a pair of rollers which can be rotated in a rotating manner and form a mold
Die Erfindung betrifft eine Vorrichtung zum Stranggießen eines Metallbandes vorzugsweise im Dickenbereich zwischen 1 und 10 mm, insbesondere eines Stahlbandes, zwischen zwei in Gießrichtung miteinander zur Ausbildung der Breitseitenwände des Metallbandes nach Art einer umlaufend bewegbaren Kokille im radialen Abstand angeordneten kühlbaren Rollen, welche zwischen sich einen Gießspalt begrenzen, wobei die Stirnseiten des Gießspaltes und der Rollen anstellbare und/oder einstellbare Abdichtungselemente aufweisen.The invention relates to a device for the continuous casting of a metal strip, preferably in the thickness range between 1 and 10 mm, in particular a steel strip, between two in the casting direction with one another to form the wide side walls of the metal strip in the manner of a circumferentially movable mold with radially spaced coolable rollers, which are between them Limit the casting gap, the end faces of the casting gap and the rollers having adjustable and / or adjustable sealing elements.
Das Dokument WO 00/40355 beschreibt Platten aus Feuerfest-Material für die Stirnseiten-Abdichtung von Gießmaschinen im Dauerbetrieb, umfassend zwei gegenläufig rotierende Rollen mit zwei oder mehr sich überlappenden Lagen aus keramischem und/oder Feuerfest-Material. Die erste Lage besteht aus einem Material, welches beim Betrieb der Rollen, insbesondere beim Startbetrieb, vergleichsweise leicht abgenützt wird, wogegen die zweite, der ersten Lage unterlegte Lage, aus keramischem und/oder hitzebeständigem und/oder Carbon-Material besteht, dabei eine sehr hohe Resistenz gegen Hitze und Abrieb aufweist und selbstschmierende Eigenschaften besitzt.Document WO 00/40355 describes plates made of refractory material for the end face sealing of casting machines in continuous operation, comprising two counter-rotating rollers with two or more overlapping layers made of ceramic and / or refractory material. The first layer consists of a material which is comparatively easily worn during operation of the rollers, in particular during start-up operation, whereas the second layer underlaid with the first layer consists of ceramic and / or heat-resistant and / or carbon material has high resistance to heat and abrasion and has self-lubricating properties.
Das Dokument EP 0 714 716 B1 offenbart eine Vorrichtung zum Strangguß von Stahlschmelze zwischen zwei gegenläufigen Walzen mit parallelen Achsen, welche zwischen sich einen Gießraum definieren, und eine Abdeckung umfaßt, die über dem Gießraum angeordnet ist und zwei Längswände aufweist, die sich jeweils entlang der Oberfläche jeder Walze erstrecken und mit Gaszuleitungen versehen sind, welche Öffnungen aufweisen, die zu diesen Oberflächen hin münden, Jede Wand weist Mittel zur Abdichtung durch Druckverlust auf, um einen Druckverlust in einer Zone zwischen der Wand und der Oberfläche der
entsprechenden Walze und zwischen zwei der Leitungen zu erzeugen, so dass der Gasstrom, welcher von der Leitung zugeführt wird, die sich bezüglich der Drehrichtung der Walze stromaufwärts befindet, zur Außenseite der Abdeckung gelenkt wird, und der Gasstrom, der von der Leitung zugeführt wird, die sich stromabwärts befindet, zum Gießraum abgelenkt wird.Document EP 0 714 716 B1 discloses a device for the continuous casting of molten steel between two counter-rotating rolls with parallel axes, which define a casting space between them, and comprises a cover which is arranged above the casting space and has two longitudinal walls, each along the Extend the surface of each roller and are provided with gas supply lines which have openings which open to these surfaces. Each wall has means for sealing by pressure loss in order to prevent pressure loss in a zone between the wall and the surface of the corresponding roller and between two of the lines, so that the gas stream which is supplied from the line which is upstream with respect to the direction of rotation of the roller is directed to the outside of the cover, and the gas stream which is supplied from the line, which is downstream, is deflected to the casting room.
Die Mittel zur Abdichtung durch Druckverlust werden von einem Vorsprung der Wand gebildet, der sich zwischen den Leitungen bis in unmittelbare Nähe der Oberfläche der Walze erstreckt. Die Mittel zur Abdichtung durch Druckverlust können Längsrillen aufweisen, die parallel zu den Leitungen angeordnet sind.The means for sealing by pressure loss are formed by a projection of the wall which extends between the lines in the immediate vicinity of the surface of the roller. The means for sealing by pressure loss can have longitudinal grooves which are arranged parallel to the lines.
Das Dokument WO 99/48 635 beschreibt ein Verfahren zum Stranggießen eines dünnen Bandes, insbesondere eines Stahlbandes, vorzugsweise mit einer Dicke geringer als 10 mm, im Zweiwalzen-Verfahren, wobei Metallschmelze in einen von zwei Gießwalzen in der Dicke des zu gießenden Bandes gebildeten Gießspalt unter Bildung eines Schmelzbades gegossen wird und die Oberflächen der Gießwalzen wird oberhalb des Schmelzbades mit einem Inertgas oder einem Inertgasgemisch bespült werden. Die Gasbespülung der Oberflächen der Gießwalzen wird über die Längserstreckung der Gießwalzen örtlich unterschiedlich durchgeführt.Document WO 99/48 635 describes a process for the continuous casting of a thin strip, in particular a steel strip, preferably with a thickness of less than 10 mm, in the two-roll process, metal melt in a casting gap formed by two casting rolls in the thickness of the strip to be cast is poured to form a melt pool and the surfaces of the casting rolls above the melt pool are flushed with an inert gas or an inert gas mixture. The gas purging of the surfaces of the casting rolls is carried out locally differently over the longitudinal extent of the casting rolls.
Die örtlichen Unterschiede können Gaszusammensetzungen, Gasmengen oder Gasdrücke sein. Auch können örtlich unterschiedliche Zustände der Oberflächenrauhigkeit der Gießwalzen oder der Oberflächenreflektionseigenschaften der Gießwalzen bzw. örtlich unterschiedliche Verfärbungen der Oberflächen der Gießwalzen beobachtet werden.The local differences can be gas compositions, gas quantities or gas pressures. Locally different states of the surface roughness of the casting rolls or the surface reflection properties of the casting rolls or locally different discoloration of the surfaces of the casting rolls can also be observed.
Die Oberflächen der Gießwalzen werden in Richtung ihrer Längserstreckung in hintereinander angeordnete Zonen eingeteilt. Jede Zone wird hinsichtlich des Zustandes der Oberflächen beobachtet. Die örtlich unterschiedliche Gasbe- spülung wird zonenweise, d.h. mit innerhalb jeder Zone einheitlicher und gleichmäßiger Gasbespülung durchgeführt.
Die WO 93/22 087 beschreibt eine Stranggießanlage mit Dampfabsaugung. Zur Vermeidung von Metallablagerungen bzw. Metalloxidablagerungen aus der Atmosphäre oberhalb des Gießmetall-Schmelzbades im Zwischenraum zwischen den Rollen einer Zwei-Rollen-Strang-Gießmaschine wird über der Oberfläche des Gießraumes durch ein Paar von Saughutzen ein Unterdruck angelegt. Die Saughutzen sind mit Abschlußelementen versehen, die einen Raum oberhalb des Schmelzbades abschließen. Reinigungsgas, bspw. Argon, wird in den geschlossenen Raum durch Düsen eingeführt, und zwar in zwei Strömen, die über die Oberflächen der Gießwalzen in Richtung auf die Oberfläche des Schmelz- bades abwärts fließen.The surfaces of the casting rolls are divided into zones arranged one behind the other in the direction of their longitudinal extent. Each zone is observed for the condition of the surfaces. The locally different gas purging is carried out zone by zone, ie with uniform and uniform gas purging within each zone. WO 93/22 087 describes a continuous caster with steam extraction. In order to avoid metal deposits or metal oxide deposits from the atmosphere above the cast metal melting bath in the space between the rolls of a two-roll continuous casting machine, a pair of suction scoops create a negative pressure above the surface of the cast room. The suction hoods are provided with closing elements that close off a space above the melting bath. Cleaning gas, for example argon, is introduced into the closed space through nozzles, in two streams, which flow down over the surfaces of the casting rolls towards the surface of the molten bath.
Ausgehend vom vorgenannten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Vorrichtung zum Stranggießen eines Metallbandes mit zwei im radialen Abstand angeordneten kühlbaren Rollen, welche zwischen sich einen Gießspalt begrenzen, anzugeben, wobei die Stirnseiten des Gießspaltes und der Rollen anstellbare und/oder einstellbare Abdichtungselemente aufweisen, die eine zuverlässige Abdichtung bewirken, dabei nur eine sehr geringe Abnutzung der Stirnseiten der Gießrollen und der Abdichtungselemente verursachen, ein Ankleben von Schmelze an die Abdichtelemente oder Teilen davon sicher vermeiden und insbesondere eine unkomplizierte Ausbildung der Abdichtungselemente und ihrer Positionierungsvorrichtungen ergeben.Based on the aforementioned prior art, the invention has for its object to provide a device for the continuous casting of a metal strip with two radially spaced coolable rollers which delimit a casting gap between them, the end faces of the casting gap and the rollers adjustable and / or adjustable Have sealing elements that provide a reliable seal, causing only very little wear on the end faces of the casting rollers and the sealing elements, reliably prevent melt from sticking to the sealing elements or parts thereof, and in particular result in an uncomplicated design of the sealing elements and their positioning devices.
Zur Lösung der Aufgabe wird mit der Erfindung bei einer Vorrichtung entsprechend dem Oberbegriff von Anspruch 1 mit der Erfindung vorgeschlagen, dass jedes Abdichtungselement je eine im gegenseitigen Abstand im wesentlichen parallele Vorder- bzw. Rückwand miteinander fest verbundenen Randbereichen aufweist, die zwischen sich nach Art einer Tasche einen gasdruckbeaufschlagten Hohlraum ausbilden, der an eine Zuleitung für Inert-Druckgas anschließbar ist, und dass die als Stirnseitenabdichtung des Gießspaltes an die Stirnseiten der Rollen anlegbare Vorderwand eines jeden Abdichtungselementes aus einem feuerfesten, gasdurchlässigen Material besteht.
Mit großem Vorteil baut sich auf der mit der Schmelze in unmittelbaren Kontakt kommenden Seite des stirnseitigen Abdichtungselementes infolge der Porosität des Materials der Vorderwand ein aufsteigendes Gaspolster auf, mit dem die rotierende Stirnseite der anliegenden Gießrollen mit reduzierter Anpreßkraft kontaktiert und somit sowohl ein Ankleben von Schmelze an der Vorderwand des Abdichtungselementes verhindert als auch eine optimale Abdichtung des Gießraumes zwischen den Walzen ohne nachteiligen Abrieb ermöglicht wird.To achieve the object it is proposed with the invention in a device according to the preamble of claim 1 with the invention that each sealing element each has an essentially parallel front and rear wall with each other firmly connected edge areas between them in the manner of a Pocket form a gas-pressurized cavity, which can be connected to a supply line for inert compressed gas, and that the front wall of each sealing element, which can be placed on the end faces of the rollers as an end face seal of the casting gap, consists of a refractory, gas-permeable material. With great advantage, an ascending gas cushion builds up on the side of the end sealing element that comes into direct contact with the melt due to the porosity of the material of the front wall, with which the rotating end face of the adjacent casters contacts with reduced contact pressure and thus both sticking of the melt the front wall of the sealing element prevents as well as an optimal sealing of the casting space between the rollers is made possible without disadvantageous abrasion.
Alternativ kann der Hohlraum durch die rollenseitige poröse feuerfeste Seiten- abdichtung und dass tragende und anstellbare Trägerelemente gebildet werden.Alternatively, the cavity can be formed by the porous, fire-proof side seal on the roller side and by the supporting and adjustable support elements.
Weitere Ausgestaltungen der Vorrichtung sind entsprechend den Unteransprüchen vorgesehen.Further configurations of the device are provided in accordance with the subclaims.
Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus der nachstehenden Erläuterung eines in der Zeichnung schematisch dargestellten Ausführungsbeispieles. Es zeigen:Details, features and advantages of the invention emerge from the following explanation of an exemplary embodiment shown schematically in the drawing. Show it:
Figur 1 eine erfindungsgemäße Vorrichtung zum Stranggießen eines vergleichsweise schmalen Metallbandes in Frontansicht der Gießrollen;1 shows a device according to the invention for the continuous casting of a comparatively narrow metal strip in a front view of the casting rolls;
Figur 2 die Vorrichtung gemäß Fig. 1 in Seitenansicht.Figure 2 shows the device of FIG. 1 in side view.
Figur 1 zeigt eine Vorrichtung zum Stranggießen eines Metallbandes 13, insbesondere eines Stahlbandes, mit zwei in Gießrichtung miteinander zur Ausbildung der Breitseite des Metallbandes nach Art einer umlaufend bewegbaren Kokille im radialen Abstand angeordneten kühlbaren Rollen 6, welche zwischen sich einen Gießspalt 7 begrenzen, wobei die Stirnseiten des Gießspaltes 7 und der Rollen 6 anstellbare und/oder einstellbare Abdichtungselemente 5 aufwei-
sen. Mit der Rollengießmaschine werden bevorzugt Stahlbänder im Dickenbereich zwischen 1 und 10 mm erzeugt.Figure 1 shows a device for the continuous casting of a metal strip 13, in particular a steel strip, with two coolable rollers 6 arranged in the casting direction with one another to form the broad side of the metal strip in the manner of a circumferentially movable mold, which delimit a casting gap 7 between them, the End faces of the casting gap 7 and the rollers 6 adjustable and / or adjustable sealing elements 5 on sen. The roll casting machine preferably produces steel strips in the thickness range between 1 and 10 mm.
Jedes Abdichtungselement 5 weist je eine im gegenseitigen Abstand im wesentlichen parallele Vorderwand 10 bzw. Rückwand 11 mit einander fest ver- bundenen Randbereichen 14 auf, die zwischen sich nach Art einer Tasche einen gasdruckbeaufschlagten Hohlraum 8 ausbilden. Der Hohlraum 8 ist an eine Zuleitung 9 für Inert-Druckgas anschließbar. Die als Stirnseitenabdichtung 5 des Gießspaltes 7 an die Stirnseiten 12 der Rollen 6 anlegbare Vorderwand 10 eines jeden Abdichtungselementes 5 besteht aus einem feuerfesten, gas- durchlässigen Material.Each sealing element 5 has a front wall 10 or rear wall 11, which is essentially parallel to one another at a distance from one another, with edge regions 14 which are firmly connected to one another and which form a gas-pressurized cavity 8 between them in the manner of a pocket. The cavity 8 can be connected to a feed line 9 for inert compressed gas. The front wall 10 of each sealing element 5, which can be placed on the end faces 12 of the rollers 6 as the end face seal 5 of the casting gap 7, consists of a refractory, gas-permeable material.
Aus der Darstellung der Vorrichtung in den Figuren 1 und 2 geht hervor, dass das gasdurchlässige feuerfeste Material eine poröse Vorderwand 10 mit über ihre Fläche im wesentlichen gleichmäßiger Anordnung von Poren ausbildet.From the illustration of the device in FIGS. 1 and 2 it can be seen that the gas-permeable refractory material forms a porous front wall 10 with an essentially uniform arrangement of pores over its surface.
Die Größe und/oder die Anzahl der gasdurchlässigen Poren ist über die Höhe der Seitenabdichtung entsprechend des ferrostatischen Druckes unter Berücksichtigung der Volumenausdehnung infolge der Temperaturerhöhung des Inertgases an die Gießparameter angepaßt.The size and / or the number of gas-permeable pores is adapted to the casting parameters via the height of the side seal in accordance with the ferrostatic pressure, taking into account the volume expansion due to the temperature increase of the inert gas.
Dementsprechend besteht die gasdurchlässige, feuerfeste Wand 10 aus einem Haufwerk feuerfester Materialpartikel, die durch Sintern unter hohem Druck und hoher Temperatur zu einem festen Formgebilde miteinander verbunden sind, welches eine Vielzahl feiner Poren aufweist.Accordingly, the gas-permeable, refractory wall 10 consists of a pile of refractory material particles which are connected to one another by sintering under high pressure and high temperature to form a solid shaped structure which has a multiplicity of fine pores.
Dadurch wird erreicht, dass das Inertgas aus dem Hohlraum 8 unter entsprechend angepaßtem Gasdruck die Vorderwand 10 durchdringt und zwischen dieser und der Stirnseite 12 der Rollen 6 ein aufsteigendes Polster aus Gas ausbildet.
Bevorzugt kann das poröse, feuerfeste Material ein Sintermetall, insbesondere ein Sinterstahl, sein. Ein derartiges Sintermetall hat insbesondere selbstschmierende, reibungsve mindemde Gleiteigenschaften. Es kann aus gesinterten Edelstahlpartikeln bestehen.It is thereby achieved that the inert gas from the cavity 8 penetrates the front wall 10 under a correspondingly adjusted gas pressure and forms an ascending cushion of gas between this and the end face 12 of the rollers 6. The porous, refractory material can preferably be a sintered metal, in particular a sintered steel. Such a sintered metal has, in particular, self-lubricating, friction-reducing sliding properties. It can consist of sintered stainless steel particles.
Die Porosität der Vorderwand 10 ist in etwa auf den von flüssiger Schmelze benetzten Bereich und die Kontaktfläche zur Stirnseite der Gießrolle begrenzt. Vorzugsweise ist die Anzahl und Größe der Poren im Kontaktbereich zur Stirnseite der Gießrolle größer als im Eingießbereich. Die Grenze zwischen der Vorderwand 10 und dem nicht porösen Teil des Abdichtungselementes 5 ist durch eine in Punkten angedeutete Linie 10 in Figur 1 eingezeichnet.The porosity of the front wall 10 is approximately limited to the area wetted by liquid melt and the contact area to the end face of the casting roll. The number and size of the pores in the contact area to the end face of the casting roll is preferably greater than in the pouring area. The boundary between the front wall 10 and the non-porous part of the sealing element 5 is shown in FIG. 1 by a line 10 indicated in points.
Infolge der Porosität des Abdichtungsmaterials kann erfindungsgemäß erreicht werden, dass ein flächenbezogener Volumenstrom und der Arbeitsdruck des Inertgases nach Maßgabe der Gießparameter wie Stahlqualität, Querschnitts- fläche des Gußstücks, Gießgeschwindigkeit und Gießtemperatur eingestellt wird.As a result of the porosity of the sealing material, it can be achieved according to the invention that an area-related volume flow and the working pressure of the inert gas are set in accordance with the casting parameters such as steel quality, cross-sectional area of the casting, casting speed and casting temperature.
Die Stranggießanlage verfügt in an sich bekannter Weise über eine Gießpfanne 1 mit einem Gießrohr 2 zur geregelten Überleitung von Schmelze in den Ver- teuer 3, woraus Schmelze in geregeltem Fluß mit Hilfe von mindestens einem Tauchrohr 4 in den Gießspalt 7 zwischen den Rollen 6 eingeleitet wird.
The continuous casting plant has, in a manner known per se, a ladle 1 with a pouring tube 2 for the controlled transfer of melt into the rewinder 3, from which melt is introduced in a controlled flow into the pouring gap 7 between the rollers 6 with the aid of at least one dip tube 4 ,
Liste der BezugszeichenList of reference numbers
1 Gießpfanne1 ladle
2 Gießrohr2 pouring tube
3 Verteiler3 distributors
4 Tauchrohr4 dip tube
5 Abdichtungselement5 sealing element
6 Rollen6 rolls
7 Gießspalt7 casting gap
8 Hohlraum8 cavity
9 Zuleitung Inertgas9 Inert gas supply
10 Vorderwand10 front wall
11 Rückwand11 rear wall
12 Stirnseite12 end face
13 Stranggießband/ Metallband13 continuous casting belt / metal belt
14 Randbereiche
14 marginal areas
Claims
1. Vorrichtung zum Stranggießen eines Metallbandes (13) vorzugsweise im Dickenbereich zwischen 1 bis 10 mm, insbesondere eines Stahlbandes, mit zwei in Gießrichtung miteinander zur Ausbildung der Breitseite des1. Device for the continuous casting of a metal strip (13) preferably in the thickness range between 1 to 10 mm, in particular a steel strip, with two in the casting direction to form the broad side of the
Metallbandes nach Art einer umlaufend bewegbaren Kokille im radialen Abstand angeordneten kühlbaren Rollen (6), welche zwischen sich einen Gießspalt (7) begrenzen, wobei die Stirnseiten des Gießspaltes (7) und der Rollen (6) anstellbare und/oder einstellbare Abdichtungselemente (5) aufweisen, dadurch gekennzeichnet, dass jedes Abdichtungselement (5) je eine im gegenseitigen Abstand im wesentlichen parallele Vorder- (10) bzw. Rückwand (11) mit einander fest verbundenen Randbereichen (14) aufweist, die zwischen sich nach Art einer Tasche einen gasdruckbeaufschlagten Hohlraum (8) ausbilden, der an eine Zuleitung (9) für Inert-Druckgas anschließbar ist, und dass die als Stirnseitenabdichtung (5) des Gießspaltes (7) an die Stirnseiten (12) der Rollen (6) anlegbare Vorderwand (10) eines jeden Abdichtungselementes (5) aus einem feuerfesten, gasdurchlässigen Material besteht.Metal strip in the manner of a circumferentially movable mold with coolable rollers (6) arranged at a radial distance, which delimit a casting gap (7) between them, the end faces of the casting gap (7) and the rollers (6) adjustable and / or adjustable sealing elements (5) characterized in that each sealing element (5) has a front wall (10) or rear wall (11), which is essentially parallel to one another and has firmly connected edge regions (14), which between them, like a pocket, has a gas-pressurized cavity (8) form, which can be connected to a feed line (9) for inert compressed gas, and that the front wall (10) of each, which can be placed as an end face seal (5) of the casting gap (7) on the end faces (12) of the rollers (6) Sealing element (5) consists of a refractory, gas-permeable material.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass das gasdurchlässige, feuerfeste Material eine poröse Vorderwand (10) mit über ihre Fläche im wesentlichen gleichmäßiger Anordnung von Poren ausbildet.2. Device according to claim 1, characterized in that the gas-permeable, refractory material forms a porous front wall (10) with an essentially uniform arrangement of pores over its surface.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Vorderwand (10) aus einem feuerfesten, gasdurchlässigen Ma- terial besteht und der Hohlraum (8) durch das tragende und anstellbare3. Device according to claim 1 or 2, characterized in that the front wall (10) consists of a refractory, gas-permeable material and the cavity (8) by the load-bearing and adjustable
Trägerelement ausgebildet ist. Carrier element is formed.
4. Vorrichtung nach Anspruch 1 , 2 oder 3, dadurch gekennzeichnet, dass das gasdurchlässige, feuerfeste Material eine poröse Vorderwand (10) ausbildet, wobei die Anzahl und/oder die Größe der Poren über die Höhe der Seitenabdichtung entsprechend dem ferrostatischen Druck angepaßt ist.4. Apparatus according to claim 1, 2 or 3, characterized in that the gas-permeable, refractory material forms a porous front wall (10), the number and / or the size of the pores being adjusted via the height of the side seal in accordance with the ferrostatic pressure.
5. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Anzahl und/oder Größe der Poren unter Berücksichtigung der5. The device according to one or more of claims 1 to 4, characterized in that the number and / or size of the pores taking into account the
Volumenausdehnung infolge der Temperaturerhöhung des Inertgases an die Gießparameter angepaßt ist.Volume expansion due to the temperature increase of the inert gas is adapted to the casting parameters.
6. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Anzahl und/oder Größe der Poren in dem gasdurchlässigen, feuerfesten Material im Kontaktbereich zur Stirnseite der Gießrolle (6) größer als im Eingießbereich ist.6. The device according to one or more of claims 1 to 5, characterized in that the number and / or size of the pores in the gas-permeable, refractory material in the contact area to the end face of the casting roll (6) is greater than in the pouring area.
7. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die gasdurchlässige, feuerfeste Wand (10) aus einem Haufwerk feuerfester Materialpartikel besteht, die durch Sintern unter hohem Druck und hoher Temperatur zu einem festen Formgebilde miteinander ver- bunden sind, das eine Vielzahl feiner Poren aufweist.7. The device according to one or more of claims 1 to 6, characterized in that the gas-permeable, refractory wall (10) consists of a pile of refractory material particles, which are connected to one another by sintering under high pressure and high temperature to form a solid shape , which has a large number of fine pores.
8. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das poröse, feuerfeste Material ein Sintermetall, insbesondere Sin- terstahl ist. 8. The device according to one or more of claims 1 to 7, characterized in that the porous, refractory material is a sintered metal, in particular sintered steel.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass das Sintermetall aus gesinterten Edelstahlpartikeln besteht.9. The device according to claim 8, characterized in that the sintered metal consists of sintered stainless steel particles.
10. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass die Porosität der Vorderwand (10) in etwa auf den von flüssiger Schmelze benetzten Bereich derselben begrenzt ist.10. The device according to one or more of claims 1 to 9, characterized in that the porosity of the front wall (10) is approximately limited to the area thereof wetted by liquid melt.
11. Verfahren zum Stranggießen eines schmalen Metallbandes mittels einer Vorrichtung entsprechend den Ansprüchen 1 bis 10, dadurch gekennzeichnet, dass ein flächenbezogener Volumenstrom und der Arbeitsdruck des Inertgases nach Maßgabe der Gießparameter wie Stahlqualität, Querschnittsfläche des Gußstücks, Gießgeschwindigkeit und Gießtemperatur eingestellt wird. 11. A process for the continuous casting of a narrow metal strip by means of a device according to claims 1 to 10, characterized in that an area-related volume flow and the working pressure of the inert gas are set in accordance with the casting parameters such as steel quality, cross-sectional area of the casting, casting speed and casting temperature.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01993517A EP1337363A1 (en) | 2000-11-09 | 2001-11-07 | Device and method for continuously casting a metal strip in the casting gap between a pair of rollers which can move in a rotating manner and which can form a mould |
| AU2002223669A AU2002223669A1 (en) | 2000-11-09 | 2001-11-07 | Device and method for continuously casting a metal strip in the casting gap between a pair of rollers which can move in a rotating manner and which can form a mould |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10055410.5 | 2000-11-09 | ||
| DE2000155410 DE10055410A1 (en) | 2000-11-09 | 2000-11-09 | Device, for continuously casting steel strip, comprises coolable radially interspersed rollers defining casting gap and having adjustable sealing elements with front and rear walls parallel to each other |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002038309A1 true WO2002038309A1 (en) | 2002-05-16 |
Family
ID=7662617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2001/012851 WO2002038309A1 (en) | 2000-11-09 | 2001-11-07 | Device and method for continuously casting a metal strip in the casting gap between a pair of rollers which can move in a rotating manner and which can form a mould |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1337363A1 (en) |
| CN (1) | CN1484557A (en) |
| AU (1) | AU2002223669A1 (en) |
| DE (1) | DE10055410A1 (en) |
| WO (1) | WO2002038309A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337820B (en) * | 2008-08-15 | 2012-07-04 | 上海宝明耐火材料有限公司 | Locked coil rope fire-resistant material for continuous casting tundish crystallizer dummy ingot head and method for preparing same |
| IT202100003029A1 (en) * | 2021-02-11 | 2022-08-11 | Danieli Off Mecc | CONTAINMENT SYSTEM OF METALLIC MATERIAL IN A CASTING OF METALLIC PRODUCTS |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS579566A (en) * | 1980-06-23 | 1982-01-19 | Mitsubishi Heavy Ind Ltd | Direct rolling type continuous casting method of metallic sheet |
| EP0447940A1 (en) * | 1990-03-14 | 1991-09-25 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Sintered product for making sheath used for continuous thin plate molding apparatus and sheath using the same |
| JPH04224050A (en) * | 1990-12-21 | 1992-08-13 | Kobe Steel Ltd | Method for preventing solidification of end parts in strip casting |
| DE4321478A1 (en) * | 1992-07-03 | 1994-01-05 | Usinor Sacilor Puteaux | Continuous casting assembly - has a plate of fireproof fibres at one fixed wall of the casting zone to prevent premature setting of molten metal by gas blown through |
| EP0588743A1 (en) * | 1992-09-14 | 1994-03-23 | USINOR SACILOR Société Anonyme | Installation for continuous casting of thin metallic products between rolls |
-
2000
- 2000-11-09 DE DE2000155410 patent/DE10055410A1/en not_active Withdrawn
-
2001
- 2001-11-07 WO PCT/EP2001/012851 patent/WO2002038309A1/en not_active Application Discontinuation
- 2001-11-07 AU AU2002223669A patent/AU2002223669A1/en not_active Abandoned
- 2001-11-07 EP EP01993517A patent/EP1337363A1/en not_active Withdrawn
- 2001-11-07 CN CNA018185150A patent/CN1484557A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS579566A (en) * | 1980-06-23 | 1982-01-19 | Mitsubishi Heavy Ind Ltd | Direct rolling type continuous casting method of metallic sheet |
| EP0447940A1 (en) * | 1990-03-14 | 1991-09-25 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Sintered product for making sheath used for continuous thin plate molding apparatus and sheath using the same |
| JPH04224050A (en) * | 1990-12-21 | 1992-08-13 | Kobe Steel Ltd | Method for preventing solidification of end parts in strip casting |
| DE4321478A1 (en) * | 1992-07-03 | 1994-01-05 | Usinor Sacilor Puteaux | Continuous casting assembly - has a plate of fireproof fibres at one fixed wall of the casting zone to prevent premature setting of molten metal by gas blown through |
| EP0588743A1 (en) * | 1992-09-14 | 1994-03-23 | USINOR SACILOR Société Anonyme | Installation for continuous casting of thin metallic products between rolls |
Non-Patent Citations (2)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 006, no. 069 (M - 125) 30 April 1982 (1982-04-30) * |
| PATENT ABSTRACTS OF JAPAN vol. 016, no. 576 (M - 1345) 16 December 1992 (1992-12-16) * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1484557A (en) | 2004-03-24 |
| AU2002223669A1 (en) | 2002-05-21 |
| DE10055410A1 (en) | 2002-05-23 |
| EP1337363A1 (en) | 2003-08-27 |
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