EP0283425B1 - Method and apparatus for casting metal strips, particularly steel ones - Google Patents

Method and apparatus for casting metal strips, particularly steel ones Download PDF

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Publication number
EP0283425B1
EP0283425B1 EP88730032A EP88730032A EP0283425B1 EP 0283425 B1 EP0283425 B1 EP 0283425B1 EP 88730032 A EP88730032 A EP 88730032A EP 88730032 A EP88730032 A EP 88730032A EP 0283425 B1 EP0283425 B1 EP 0283425B1
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EP
European Patent Office
Prior art keywords
casting
transportation belt
casting apparatus
cooled
conveyor belt
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EP88730032A
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German (de)
French (fr)
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EP0283425A1 (en
Inventor
Wolfgang Prof. Dr.-Ing. Reichelt
Matthias Scheulen
Klaus Prof. Dr.-Ing. Schwerdtfeger
Peter Dr.-Ing. Voss-Spilker
Ewald Dipl.-Ing. Feuerstacke
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Vodafone GmbH
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Mannesmann AG
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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
    • B22D11/0631—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 device for casting strips of metal, in particular steel, consisting of a storage vessel with a pouring nozzle and a shaping device for the casting belt, the storage vessel and shaping device being mounted on a frame which is adjustable in inclination to the horizontal.
  • Such a device with a frame adjustable in inclination, is described in DE-AS 21 16 870. It is used for casting non-ferrous metals with metal strip thicknesses of a few millimeters. A practically advantageously applicable embodiment for steel as molten metal is not known.
  • Such a method requires an instantaneous acceleration of the molten metal from the exit direction of the molten metal, starting from the pouring nozzle in the direction of movement of the cooled conveyor belt.
  • the occurring differences in speed cause an unsafe flow, so that the desired thickness is difficult to control and differences in thickness cannot be excluded.
  • the invention has for its object to improve the casting and continuous casting dynamically and fluidically.
  • the casting device With the casting device according to the invention, only a weak deflection of the individual sub-layer flows is achieved with layer-dependent acceleration in the direction of movement of the conveyor belt, so that a largely laminar flow is achieved on the cooled conveyor belt.
  • the discharge speed at the end of the pouring nozzle is almost equal to the conveyor belt speed.
  • the parameters to be observed are in particular the metal strip thickness, the superheating temperature and the properties of the respective steel grades.
  • the casting process is initiated in that the conveyor belt is gradually tilted from an approximately horizontal starting position of the impact surface for the molten metal into the inclined operating position for starting.
  • the design of the pouring device has the advantage of being able to set a common inclination of the storage vessel and the conveyor belt level as well as a separate setting between the storage vessel and the conveyor belt level, the height distance being taken into account in addition to the inclination.
  • a further improvement provides that a slide guide for an adjustable slide is provided on the frame, on which the storage container and at least lifting devices for the storage container are arranged.
  • the storage vessel can be set on the one hand to the conveyor belt and on the other hand can be completely removed from the area of the conveyor belt so that the conveyor belt is accessible.
  • a support for the cooled conveyor belt is arranged between the drums, that the support has a continuous contour that runs over a tangent to the drum circumference and that at least in the area of Pouring nozzle of the storage vessel is provided with a height that corresponds at least to the thickness of the cooled conveyor belt together with the thickness of the cast belt and is adapted to the course of the continuous contour of the support or the cooled conveyor belt and is arranged laterally.
  • a suitable base for guiding the conveyor belt and for weight absorption also created the cast belt and on the other hand created a basis for a basis connected with the inclination adjustment for setting the most favorable flow conditions by the continuous contour. Then the moving seal solves the problem of lateral leakage of the casting material or lateral thickness differences across the cross section of the cast strip.
  • a cooled smoothing roll is arranged on the conveyor belt plane of the cooled conveyor belt at a distance from the thickness of the cast belt. An improved surface quality is thus achieved on the surface of the cast belt facing away from the conveyor belt.
  • the cooled smoothing roller is arranged in the region of the pouring nozzle of the storage container.
  • the smoothing is still carried out in a certain warm area, in which an influence on the surface is advantageous.
  • An advantageous measure to protect the conveyor belt is that a cooling medium can be introduced under pressure between the curved support and the cooled conveyor belt. This increases the cooling for the conveyor belt, which means that a considerable amount of heat has to be dissipated when the casting belt cools down.
  • a further embodiment of the invention consists in that a guide for the cooled conveyor belt is assigned to the drum on the casting side, which is arranged in the region of the pouring nozzle.
  • a guide for the cooled conveyor belt is assigned to the drum on the casting side, which is arranged in the region of the pouring nozzle.
  • a further improvement is that the drum on the casting side is assigned a cleaning or spraying device for applying size. This advantageously favors the loosening of the cast belt from the conveyor belt.
  • the lateral, rotating seal consists of metallic elements forming a flat surface in the operating position.
  • a pouring space is formed between the pouring nozzle of the storage container, the cooled conveyor belt guided on the support, the smoothing roller and the lateral, rotating seal, which is filled with inert gas.
  • the consumption of inert gas can also be limited in that a hood protecting against oxidation is arranged after the smoothing roll in the casting direction.
  • the cast strip 1 to be cast is made of molten metal 2 (molten steel), which flows from a storage vessel 3 through a pouring nozzle 4 and arrives at a conveyor belt 5, to which the nozzle mouth 6 with its plane extending over the width 1a has a thickness of 7 mm Casting belt 1 is set at an acute angle to the conveyor belt plane 5a of the conveyor belt 5. An angle adjustment is made in such a way that the nozzle mouth 6 is sealed at its rear part 6a in the direction of movement 8 by the surface tension of the molten metal 2 (meniscus) and at its front part 6b in the direction of movement 8 is at the acute angle, which is the thickness 7 to Conveyor belt level 5a results.
  • molten metal 2 molten steel
  • the conveyor belt plane 5a forms an acute angle 11 to the horizontal 9 in the casting direction 10, which is formed by a corresponding curvature or curvature of the course of the conveyor belt plane 5a.
  • the inclination of the conveyor belt 5 to the horizontal 9 in the casting direction 10 is set as a function of the casting speed and the material parameters of the molten metal (e.g. metal belt thickness 7, superheating temperature, type of steel and the like), so that the outflow speed 12 within the pouring nozzle 4 is equal to the conveyor belt speed 15 .
  • the conveyor belt speed 15 can also be regulated to the specified dimensions of the pouring nozzle 4 and the discharge speed 12 in order to bring the discharge speed into line with the conveyor belt speed 15.
  • the thickness 7 of the cast strip 1 is drawn greatly enlarged in FIGS. 2 and 3 in order to make the speed profile 14 more visible.
  • the speed profile 14 in the front part 6b of the nozzle mouth 6 is advantageously influenced by a tear-off ring 18, which roughly corresponds to the crushing rings usual in horizontal continuous casting within a horizontal continuous casting mold, i.e. e.g. is made of boron nitride, but causes the metal melt to tear off continuously.
  • the casting device for cast strips 1 with a thickness 7 of a few millimeters has a storage vessel 3 (FIG. 4) which is provided with a lining 19, an intermediate wall 20, a cover 21 and the pouring nozzle 4.
  • the pouring nozzle 4 is mounted in a pouring stone 22 and held by a sealing ring 24 by means of a retaining ring 23 fastened to the vessel jacket 3a.
  • the pouring nozzle 4 is therefore easy to replace.
  • Either a cooling device 25 or a heating device 26 is arranged around the front area 4a, both of which can also be combined and can be switched on or off depending on the temperature of the molten metal 2.
  • an adjustable, cooled smoothing roll 27 Behind the pouring nozzle 4 in the casting direction 10 there is an adjustable, cooled smoothing roll 27, the length of which is dimensioned in accordance with the width of the casting belt 1, above the conveyor belt level 5a at a distance of the thickness 7 of the casting belt 1.
  • the smoothing roller 27 is also rotatably supported in a pivot bearing 28 (FIG. 5) which is supported on a pair of articulated arms 29 and a pair of columns 30.
  • a (hydraulic) pair of lifting units 31 is used for setting and adjusting the smoothing roller 27.
  • the storage vessel 3 for the molten metal 2 and the drums 5b and 5c with the conveyor belt 5 are arranged on a frame 32.
  • the frame 32 consists of two parallel beams 32a and 32b (Fig. 6).
  • the frame 32 can be pivoted about the horizontal axis 33 of the bearing block pair 34 by a piston-cylinder engine 36 which is supported on the corridor 35 and is articulated and articulated on the frame 32.
  • the storage vessel 3 is on the frame 32 adjustable in height and inclination to the conveyor belt level 5a.
  • a slide guide 37 for an adjustable slide 38 is also provided on the frame 32.
  • the carriage 38 carries the storage vessel 3 and a lifting device 39 for the storage vessel 3.
  • the carriage 38 is designed here as a carriage 38a with wheels 40 and can be moved horizontally.
  • the slide 38 has a drive in the form of a displacement cylinder 41, the cylinder housing 42 of which is articulated on the slide guide 43 at 43a.
  • a support 44 is arranged between the drums 5b and 5c (FIG. 4), which is provided with a special contour 45 opposite the smoothing roller 27.
  • the contour 45 has a continuous course which runs continuously but arched above a tangent 46 placed on the drum circumferences (FIG. 2).
  • a moving seal 47 which is adapted to the course of the continuous contour 45 and which projects beyond the thickness 7 of the cast strip 1 and is flexible and is guided in each case via pairs of rollers 48 and 49.
  • the axes 50 of the pairs of rollers 48 and 49 accordingly run perpendicular or obliquely to the horizontal 9.
  • the flexible seal 47 consists of metallic elements 52 forming a flat surface 51 in the operating position.
  • a cooling medium 53 is introduced under pressure between the arched support 44 and the conveyor belt 5.
  • the conveyor belt 5 is also guided laterally in the region of the pouring nozzle 4 by a guide 54 (FIG. 7) in order to keep wear to the flexible seal 47 low.
  • a cleaning device 55 and a spray device 56 are also assigned to the casting-side drum 5b.
  • a pouring chamber 57 (FIG. 4) is formed between the pouring nozzle 4 of the storage container 3, the cooled conveyor belt 5 guided on the support 44, the smoothing roller 27 and the lateral, rotating seal 47, which is formed by an inert gas, e.g. Argon or nitrogen, is fulfilled and is therefore surrounded by a hood 58 (FIG. 5), into which the inert gas enters through a pipeline 59 and flows out through a gap 60 and thus keeps the atmospheric oxygen away from the cast strip 1 during solidification.
  • an inert gas e.g. Argon or nitrogen

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zum Gießen von Bändern aus Metall, insbesondere aus Stahl bestehend aus einem Vorratsgefäß mit Ausgußdüse und einer Formgebungseinrichtung für das Gießband, wobei Vorratsgefäß und Formgebungseinrichtung auf einem zur Horizontalen in der Neigung verstellbaren Rahmen gelagert sind.The invention relates to a device for casting strips of metal, in particular steel, consisting of a storage vessel with a pouring nozzle and a shaping device for the casting belt, the storage vessel and shaping device being mounted on a frame which is adjustable in inclination to the horizontal.

Eine derartige Vorrichtung, mit in der Neigung verstellbarem Rahmen ist in der DE-AS 21 16 870 beschrieben. Sie dient zum Gießen von NE-Metallen bei Metallbanddicken von einigen Millimetern. Eine praktisch vorteilhaft anwendbare Ausführungsform für Stahl als Metallschmelze ist nicht bekannt.Such a device, with a frame adjustable in inclination, is described in DE-AS 21 16 870. It is used for casting non-ferrous metals with metal strip thicknesses of a few millimeters. A practically advantageously applicable embodiment for steel as molten metal is not known.

Aus der DE-OS 35 21 778 bzw. der EP-A 0208890 ist es bekannt, auf ein horizontal angeordnetes, ebenes Transportband zu gießen, wobei das Ausgießen dahingehend erfolgt, daß unter Berücksichtigung der sich beim Angießen auf die bewegte Kühlfläche des Kühlkörpers (Transportband) im Bereich der Düse keilförmig aufbauenden Erstarrungsfront und unter Anpassung der Geschwindigkeit der Kühlfläche der freie Spalt zwischen der auslaufseitigen Düsenlippe und ggf. den seitlichen Düsenlippen von einem ein unkontrolliertes Ausfließen des schmelz flüssigen Metalls verhindernden kleinen Anfangswert allmählich auf den der gewünschten Strangdicke entsprechenden, ebenfalls ein unkontrolliertes Ausfließen verhindernden Endwert vergrößert wird. Ein solches Verfahren bedingt ein momentanes Beschleunigen der Metallschmelze aus der Austrittsrichtung der Metallschmelze, ausgehend von der Ausgießdüse in Bewegungsrichtung des gekühlten Transportbandes. Die auftretenden Geschwindigkeitsunterschiede bewirken einen unsicheren Strömungsverlauf, so daß die gewünschte Dicke sich schlecht kontrollieren läßt und Dickenunterschiede nicht ausgeschlossen werden können.From DE-OS 35 21 778 and EP-A 0208890 it is known to pour onto a horizontally arranged, flat conveyor belt, the pouring taking place in such a way that taking into account the fact that during casting onto the moving cooling surface of the heat sink (conveyor belt ) in the area of the wedge-shaped solidification front and adapting the speed of the cooling surface, the free gap between the outlet-side nozzle lip and possibly the lateral nozzle lips from a small initial value preventing an uncontrolled outflow of the molten metal gradually to the corresponding strand thickness, also corresponding uncontrolled leakage preventing final value is increased. Such a method requires an instantaneous acceleration of the molten metal from the exit direction of the molten metal, starting from the pouring nozzle in the direction of movement of the cooled conveyor belt. The occurring differences in speed cause an unsafe flow, so that the desired thickness is difficult to control and differences in thickness cannot be excluded.

Der Erfindung liegt die Aufgabe zugrunde, das Angießen und das kontinuierliche Gießen dynamisch und strömungstechnisch zu verbessern.The invention has for its object to improve the casting and continuous casting dynamically and fluidically.

Die gestellte Aufgabe wird mit den Merkmalen im Kennzeichen des Anspruchs 1 gelöst.The object is achieved with the features in the characterizing part of claim 1.

Mit der erfindungsgemäßen Gießvorrichtung wird eine nur schwache Umlenkung der einzelnen Teilschichtströme bei schichtabhängiger Beschleunigung in Bewegungsrichtung des Transportbandes erzielt, so daß eine weitestgehend laminare Strömung auf dem gekühlten Transportband erzielt wird. Die Abflußgeschwindigkeit am Ende der Ausgießdüse wird hierbei nahezu gleich der Transportbandgeschwindigkeit. Die zu beachtenden Parameter sind insbesondere die Metallbanddicke, die Überhitzungstemperatur und die Eigenschaften der jeweiligen Stahlsorten.With the casting device according to the invention, only a weak deflection of the individual sub-layer flows is achieved with layer-dependent acceleration in the direction of movement of the conveyor belt, so that a largely laminar flow is achieved on the cooled conveyor belt. The discharge speed at the end of the pouring nozzle is almost equal to the conveyor belt speed. The parameters to be observed are in particular the metal strip thickness, the superheating temperature and the properties of the respective steel grades.

Der Gießvorgang wird dadurch eingeleitet, daß zum Anfahren das Transportband von einer etwa horizontalen Ausgangslage der Auftrefffläche für die Metallschmelze allmählich in die geneigte Betriebsstellung gekippt wird. Die Gestaltung der Gießvorrichtung weist den Vorteil auf, eine gemeinsame Neigung des Vorratsgefäßes und der Transportbandebene genauso einstellen zu können, wie eine separate Einstellung zwischen dem Vorratsgefäß und der Transportbandebene, wobei noch außer der Neigung der Höhenabstand berücksichtigt wird.The casting process is initiated in that the conveyor belt is gradually tilted from an approximately horizontal starting position of the impact surface for the molten metal into the inclined operating position for starting. The design of the pouring device has the advantage of being able to set a common inclination of the storage vessel and the conveyor belt level as well as a separate setting between the storage vessel and the conveyor belt level, the height distance being taken into account in addition to the inclination.

Eine weitere Verbesserung sieht vor, daß auf dem Rahmen eine Schlittenführung für einen verstellbaren Schlitten vorgesehen ist, auf dem das Vorratsgefäß und zumindest Hubeinrichtungen für das Vorratsgefäß angeordnet sind. Damit kann das Vorratsgefäß zum einen zum Transportband eingestellt werden und andererseits gänzlich aus dem Bereich des Transportbandes weggestellt werden, so daß das Transportband zugänglich wird.A further improvement provides that a slide guide for an adjustable slide is provided on the frame, on which the storage container and at least lifting devices for the storage container are arranged. In this way, the storage vessel can be set on the one hand to the conveyor belt and on the other hand can be completely removed from the area of the conveyor belt so that the conveyor belt is accessible.

Weitere Verbesserungen im Sinne eines geneigten Transportbandes für verschiedene Betriebszustände werden dadurch erzielt, daß eine Auflage für das gekühlte Transportband zwischen den Trommeln angeordnet ist, daß die Auflage eine stetige Kontur aufweist, die über einer an die Trommelumfänge gelegten Tangente verläuft und daß zumindest im Bereich der Ausgießdüse des Vorratsgefäßes eine dem Verlauf der stetigen Kontur der Auflage bzw. des gekühlten Transportbandes angepaßte, jeweils seitlich angeordnete, mitlaufende Abdichtung mit einer Höhe vorgesehen ist, die zumindest der Dicke des gekühlten Transportbandes zusammen mit der Dicke des Gußbandes entspricht. Vorteilhafterweise wird damit eine geeignete Unterlage zur Führung des Transportbandes und zur Gewichtsaufnahme u.a. auch des Gußbandes geschaffen und zum anderen durch die stetige Kontur eine Grundlage für eine mit der Neigungsverstellung verbundene Basis zur Einstellung der günstigsten Strömungsverhältnisse geschaffen. Sodann löst die mitlaufende Abdichtung das Problem eines seitlichen Austretens des Gießmaterials bzw. seitlicher Dickenunterschiede über den Querschnitt des Gußbandes betrachtet.Further improvements in the sense of an inclined conveyor belt for different operating states are achieved in that a support for the cooled conveyor belt is arranged between the drums, that the support has a continuous contour that runs over a tangent to the drum circumference and that at least in the area of Pouring nozzle of the storage vessel is provided with a height that corresponds at least to the thickness of the cooled conveyor belt together with the thickness of the cast belt and is adapted to the course of the continuous contour of the support or the cooled conveyor belt and is arranged laterally. Advantageously, a suitable base for guiding the conveyor belt and for weight absorption, among other things. also created the cast belt and on the other hand created a basis for a basis connected with the inclination adjustment for setting the most favorable flow conditions by the continuous contour. Then the moving seal solves the problem of lateral leakage of the casting material or lateral thickness differences across the cross section of the cast strip.

Über die Breite des Gußbandes hinweg betrachtet, ist es außerdem vorteilhaft, daß an der Transportbandebene des gekühlten Transportbandes im Abstand der Dicke des Gußbandes eine gekühlte Glättrolle angeordnet ist. Somit wird eine verbesserte Oberflächenqualität an der dem Transportband abgewandten Oberfläche des Gußbandes erzielt.Viewed across the width of the cast belt, it is also advantageous that a cooled smoothing roll is arranged on the conveyor belt plane of the cooled conveyor belt at a distance from the thickness of the cast belt. An improved surface quality is thus achieved on the surface of the cast belt facing away from the conveyor belt.

In Ausgestaltung der Erfindung ist vorgesehen, daß die gekühlte Glättrolle im Bereich der Ausgießdüse des Vorratsbehälters angeordnet ist. Somit erfolgt das Glätten noch in einem gewissen Warmbereich, im dem eine Einwirkung auf die Oberfläche vorteilhaft ist.In an embodiment of the invention it is provided that the cooled smoothing roller is arranged in the region of the pouring nozzle of the storage container. Thus, the smoothing is still carried out in a certain warm area, in which an influence on the surface is advantageous.

Eine vorteilhafte Maßnahme zum Schutz des Transportbandes besteht darin, daß zwischen der gewölbten Auflage und dem gekühlten Transportband ein Kühlmedium unter Druck einführbar ist. Dadurch verstärkt sich die Kühlung für das Transportband, durch das eine erhebliche Wärmemenge beim Abkühlen des Gußbandes abzuführen ist.An advantageous measure to protect the conveyor belt is that a cooling medium can be introduced under pressure between the curved support and the cooled conveyor belt. This increases the cooling for the conveyor belt, which means that a considerable amount of heat has to be dissipated when the casting belt cools down.

Eine weitere Ausgestaltung der Erfindung besteht darin, daß der gießseitigen Trommel, die im Bereich der Ausgießdüse angeordnet ist, eine Führung für das gekühlte Transportband zugeordnet ist. Eine solche Führung vermindert einen möglichen Verschleiß zwischen den seitlich angeordneten, mitlaufenden Abdichtungen in der Höhe des Transportbandes.A further embodiment of the invention consists in that a guide for the cooled conveyor belt is assigned to the drum on the casting side, which is arranged in the region of the pouring nozzle. Such a guide reduces possible wear between the laterally arranged, rotating seals at the height of the Conveyor belt.

Eine weitere Verbesserung besteht darin, daß der gießseitigen Trommel eine Reinigungs- bzw. Sprüheinrichtung zum Aufbringen von Schlichte zugeordnet ist. Vorteilhafterweise wird dadurch das Lösen des Gußbandes vom Transportband begünstigt.A further improvement is that the drum on the casting side is assigned a cleaning or spraying device for applying size. This advantageously favors the loosening of the cast belt from the conveyor belt.

Weitere Merkmale der Erfindung sehen vor, daß die seitliche, mitlaufende Abdichtung aus metallischen, in Betriebsstellung eine ebene Fläche bildenden Elementen besteht.Further features of the invention provide that the lateral, rotating seal consists of metallic elements forming a flat surface in the operating position.

Zum Schutz vor Reoxidation der Gußbandoberfläche wird vorgeschlagen, daß zwischen der Ausgießdüse der Vorratsbehälters, dem auf der Auflage geführten gekühlten Transportband, der Glättrolle und der seitlichen mitlaufenden Abdichtung ein Gießraum gebildet ist, der mit inertem Gas gefüllt ist.To protect against reoxidation of the cast belt surface, it is proposed that a pouring space is formed between the pouring nozzle of the storage container, the cooled conveyor belt guided on the support, the smoothing roller and the lateral, rotating seal, which is filled with inert gas.

Der Verbrauch inerten Gases kann außerdem dadurch beschränkt werden, indem in Gießrichtung an die Glättrolle anschließend eine vor Oxidation schützende Haube angeordnet ist.The consumption of inert gas can also be limited in that a hood protecting against oxidation is arranged after the smoothing roll in the casting direction.

Weitere Merkmale ergeben sich aus den beigefügten Zeichnungen.Further features emerge from the attached drawings.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

  • Fig. 1 eine das Verfahren erläuternde Querschnittsdarstellung durch die Ausgießdüse,
  • Fig. 2 eine Prinzipdarstellung des Transportbandes in der Phase des Angießens,
  • Fig. 3 die Prinzipdarstellung gemäß Fig. 2 in der Phase nach dem Angießen,
  • Fig. 4 einen senkrechten Querschnitt durch Vorratsgefäß und Ausgießdüse mit Transportband und Glättrolle,
  • Fig. 5 eine seitenansicht der gesamten Gießvorrichtung,
  • Fig. 6 eine Draufsicht auf die gesamte Gießvorrichtung gemäß Fig. 5 und
  • Fig. 7 eine Draufsicht auf die Partie der Gießvorrichtung mit der mitlaufenden seitlichen Abdichtung.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
  • 1 is a cross-sectional view explaining the method through the pouring nozzle,
  • 2 is a schematic diagram of the conveyor belt in the casting phase,
  • 3 shows the basic illustration according to FIG. 2 in the phase after casting,
  • 4 shows a vertical cross section through the storage vessel and pouring nozzle with conveyor belt and smoothing roll,
  • 5 is a side view of the entire casting device,
  • Fig. 6 is a plan view of the entire casting device according to FIGS. 5 and
  • Fig. 7 is a plan view of the lot of the casting device with the accompanying side seal.

Das zu gießende Gußband 1 wird aus Metallschmelze 2 (Stahlschmelze) hergestellt, die von einem Vorratsgefäß 3 durch eine Ausgießdüse 4 fließt und auf ein Transportband 5 gelangt, zu dem der Düsenmund 6 mit seiner sich über die Breite 1a erstreckenden Ebene auf die Dicke 7 des Gußbandes 1 durch einen spitzen Winkel zur Transportbandebene 5a des Transportbandes 5 eingestellt ist. Eine Winkeleinstellung erfolgt in der Art, daß der Düsenmund 6 an seinem in Bewegungsrichtung 8 hinteren Teil 6a durch die Oberflächenspannung der Metallschmelze 2 (Meniskus) abgedichtet wird und an seinem in Bewegungsrichtung 8 vorderen Teil 6b unter dem spitzen Winkel steht, der die Dicke 7 zur Transportbandebene 5a ergibt.The cast strip 1 to be cast is made of molten metal 2 (molten steel), which flows from a storage vessel 3 through a pouring nozzle 4 and arrives at a conveyor belt 5, to which the nozzle mouth 6 with its plane extending over the width 1a has a thickness of 7 mm Casting belt 1 is set at an acute angle to the conveyor belt plane 5a of the conveyor belt 5. An angle adjustment is made in such a way that the nozzle mouth 6 is sealed at its rear part 6a in the direction of movement 8 by the surface tension of the molten metal 2 (meniscus) and at its front part 6b in the direction of movement 8 is at the acute angle, which is the thickness 7 to Conveyor belt level 5a results.

Die Transportbandebene 5a bildet zur Horizontalen 9 in Gießrichtung 10 einen spitzen Winkel 11, der durch entsprechende Wölbung bzw. Krümmung des Verlaufs der Transportbandebene 5a zustandekommt.The conveyor belt plane 5a forms an acute angle 11 to the horizontal 9 in the casting direction 10, which is formed by a corresponding curvature or curvature of the course of the conveyor belt plane 5a.

Die Neigung des Transportbandes 5 zur Horizontalen 9 in Gießrichtung 10 wird in Abhängigkeit der Gießgeschwindigkeit und der Werkstoffparameter der Metallschmelze (z.B. Metallbanddicke 7, Überhitzungstemperatur, Stahlsorte u. dgl.) eingestellt, so daß die Abflußgeschwindigkeit 12 innerhalb der Ausgießdüse 4 gleich der Transportbandgeschwindigkeit 15 ist. Umgekehrt kann selbstverständlich die Transportbandgeschwindigkeit 15 auch zu den festgelegten Abmessungen der Ausgießdüse 4 und der Abflußgeschwindigkeit 12 geregelt werden, um die Abflußgeschwindigkeit in Einklang mit der Transportbandgeschwindigkeit 15 zu bringen.The inclination of the conveyor belt 5 to the horizontal 9 in the casting direction 10 is set as a function of the casting speed and the material parameters of the molten metal (e.g. metal belt thickness 7, superheating temperature, type of steel and the like), so that the outflow speed 12 within the pouring nozzle 4 is equal to the conveyor belt speed 15 . Conversely, of course, the conveyor belt speed 15 can also be regulated to the specified dimensions of the pouring nozzle 4 and the discharge speed 12 in order to bring the discharge speed into line with the conveyor belt speed 15.

Zum Anfahren des Transportbandes 5 (Fig. 2 und 3) wird von einer etwa horizontalen Ausgangslage der Auftreffstelle 13 für die Metallschmelze 2 ausgegangen. In dieser Lage des Transportbandes 5 zeigt das Geschwindigkeitsprofil 14 bei entsprechender Transportbandgeschwindigkeit 15 im oberen Bereich eine negative Geschwindikgeitskomponente 16, die letztlich auch zu einer insgesamt kleineren Geschwindigkeitsverteilung 17 führt. Hier treten Scherkräfte der Metallschmelze 2 innerhalb der Strömung auf, die nur deshalb überwunden werden können, weil bereits in der Auftreffstelle 13 eine Tendenz zur Neigung besteht. Beim Anfahren wird daher dieser Zustand schnell durch Kippen des Transportbandes 5 (Fig. 3) überwunden, so daß bei erhöhter Strömungsgeschwindigkeit das Geschwindigkeitsprofil 14 rasch ansteigt und die neue Geschwindigkeitsverteilung 17a bewirkt.To start the conveyor belt 5 (FIGS. 2 and 3), an approximately horizontal starting position of the impact point 13 for the molten metal 2 is assumed. In this position of the conveyor belt 5, with a corresponding conveyor belt speed 15, the speed profile 14 shows a negative speed component 16 in the upper region, which ultimately also leads to an overall smaller speed distribution 17. Here shear forces of the molten metal 2 occur within the flow, which can only be overcome because there is already a tendency to incline in the point of impact 13. When starting, this state is therefore quickly overcome by tilting the conveyor belt 5 (FIG. 3), so that the speed profile 14 increases rapidly with increased flow speed and causes the new speed distribution 17a.

Die Dicke 7 des Gußbandes 1 ist in den Fig. 2 und 3 stark vergrößert gezeichnet, um das Geschwindigkeitsprofil 14 besser sichtbar zu machen. Außerdem wird das Geschwindigkeitsprofil 14 im vorderen Teil 6b des Düsenmundes 6 vorteilhaft noch durch einen Abreißring 18 beeinflußt, der ungefähr den im Horizontalstrangguß üblichen Brechringen innerhalb einer Horizontalstranggießkokille entspricht, d.h. z.B. aus Bornitrit gefertigt ist, jedoch ein fortlaufendes Abreißen der Metallschmelze bewirkt.The thickness 7 of the cast strip 1 is drawn greatly enlarged in FIGS. 2 and 3 in order to make the speed profile 14 more visible. In addition, the speed profile 14 in the front part 6b of the nozzle mouth 6 is advantageously influenced by a tear-off ring 18, which roughly corresponds to the crushing rings usual in horizontal continuous casting within a horizontal continuous casting mold, i.e. e.g. is made of boron nitride, but causes the metal melt to tear off continuously.

Die Gießvorrichtung für Gußbänder 1 mit einer Dicke 7 von wenigen Millimetern, weist ein Vorratsgefäß 3 (Fig. 4) auf, das mit einer Ausmauerung 19, einer Zwischenwand 20, einer Abdeckung 21 und der Ausgießdüse 4 versehen ist. Die Ausgießdüse 4 ist in einem Ausgießstein 22 gelagert und mittels eines am Gefäßmantel 3a befestigten Halteringes 23 durch einen Dichtring 24 gehalten. Die Ausgießdüse 4 ist daher leicht auswechselbar. Um den vorderen Bereich 4a ist entweder eine Kühleinrichtung 25 oder eine Heizeinrichtung 26 angeordnet, die auch beide kombiniert sein können und je nach Temperatur der Metallschmelze 2 ein- oder ausgeschaltet werden. Hinter der Ausgießdüse 4 in Gießrichtung 10 befindet sich über der Transportbandebene 5a im Abstand der Dicke 7 des Gußbandes 1 eine einstellbare, gekühlte Glättrolle 27, deren Länge entsprechend der Breite des Gußbandes 1 bemessen ist. Die Glättrolle 27 ist außerdem in einem Drehlager 28 drehgelagert (Fig. 5), das auf einem Gelenkarmpaar 29 und einem Säulenpaar 30 abgestützt ist. Ein (hydraulisches) Hubwerkspaar 31 dient zur Ein- und Anstellung der Glättrolle 27.The casting device for cast strips 1 with a thickness 7 of a few millimeters has a storage vessel 3 (FIG. 4) which is provided with a lining 19, an intermediate wall 20, a cover 21 and the pouring nozzle 4. The pouring nozzle 4 is mounted in a pouring stone 22 and held by a sealing ring 24 by means of a retaining ring 23 fastened to the vessel jacket 3a. The pouring nozzle 4 is therefore easy to replace. Either a cooling device 25 or a heating device 26 is arranged around the front area 4a, both of which can also be combined and can be switched on or off depending on the temperature of the molten metal 2. Behind the pouring nozzle 4 in the casting direction 10 there is an adjustable, cooled smoothing roll 27, the length of which is dimensioned in accordance with the width of the casting belt 1, above the conveyor belt level 5a at a distance of the thickness 7 of the casting belt 1. The smoothing roller 27 is also rotatably supported in a pivot bearing 28 (FIG. 5) which is supported on a pair of articulated arms 29 and a pair of columns 30. A (hydraulic) pair of lifting units 31 is used for setting and adjusting the smoothing roller 27.

Das Vorratsgefäß 3 für die Metallschmelze 2 und die Trommeln 5b und 5c mit dem Transportband 5 sind auf einem Rahmen 32 angeordnet. Der Rahmen 32 besteht aus zwei parallelen Trägern 32a und 32b (Fig. 6). Der Rahmen 32 ist um die horizontale Achse 33 des Lagerbockpaares 34 schwenkbar durch ein auf dem Flur 35 aufgestütztes, angelenktes und am Rahmen 32 angelenktes Kolben-Zylinder-Triebwerk 36. Das Vorratsgefäß 3 ist, wie nachfolgend noch genauer beschrieben ist, auf dem Rahmen 32 in der Höhe und in der Neigung zur Transportbandebene 5a einstellbar. Auf dem Rahmen 32 ist ferner eine Schlittenführung 37 für einen verstellbaren Schlitten 38 vorgesehen. Der Schlitten 38 trägt das Vorratsgefäß 3 und eine Hubeinrichtung 39 für das Vorratsgefäß 3. Der Schlitten 38 ist hier als Wagen 38a mit Rädern 40 ausgeführt und horizontal verfahrbar. Der Schlitten 38 weist hierzu einen Antrieb in Form eines Verschiebezylinders 41 auf, dessen Zylindergehäuse 42 an der Schlittenführung 43 bei 43a angelenkt ist.The storage vessel 3 for the molten metal 2 and the drums 5b and 5c with the conveyor belt 5 are arranged on a frame 32. The frame 32 consists of two parallel beams 32a and 32b (Fig. 6). The frame 32 can be pivoted about the horizontal axis 33 of the bearing block pair 34 by a piston-cylinder engine 36 which is supported on the corridor 35 and is articulated and articulated on the frame 32. As is described in more detail below, the storage vessel 3 is on the frame 32 adjustable in height and inclination to the conveyor belt level 5a. A slide guide 37 for an adjustable slide 38 is also provided on the frame 32. The carriage 38 carries the storage vessel 3 and a lifting device 39 for the storage vessel 3. The carriage 38 is designed here as a carriage 38a with wheels 40 and can be moved horizontally. For this purpose, the slide 38 has a drive in the form of a displacement cylinder 41, the cylinder housing 42 of which is articulated on the slide guide 43 at 43a.

Für das gekühlte Transportband 5 ist zwischen den Trommeln 5b und 5c eine Auflage 44 angeordnet (Fig. 4), die der Glättrolle 27 gegenüberliegend mit einer besonderen Kontur 45 versehen ist. Die Kontur 45 besitzt einen stetigen Verlauf, der oberhalb einer an die Trommelumfänge (Fig. 2) gelegten Tangente 46 stetig aber gewölbt verläuft. Im Bereich der Ausgießdüse 4 des Vorratsgefäßes 3 ist eine dem Verlauf der stetigen Kontur 45 angepaßte, die Dicke 7 des Gußbandes 1 überragende, mitlaufende Abdichtung 47 angeordnet, die flexibel ist und jeweils über Rollenpaare 48 und 49 geführt ist. Die Achsen 50 der Rollenpaare 48 und 49 verlaufen dementsprechend senkrecht oder schräg zur Horizontalen 9. Die flexible Abdichtung 47 besteht aus metallischen, in Betriebsstellung eine ebene Fläche 51 bildenden Elementen 52.For the cooled conveyor belt 5, a support 44 is arranged between the drums 5b and 5c (FIG. 4), which is provided with a special contour 45 opposite the smoothing roller 27. The contour 45 has a continuous course which runs continuously but arched above a tangent 46 placed on the drum circumferences (FIG. 2). In the area of the pouring nozzle 4 of the storage vessel 3 there is a moving seal 47 which is adapted to the course of the continuous contour 45 and which projects beyond the thickness 7 of the cast strip 1 and is flexible and is guided in each case via pairs of rollers 48 and 49. The axes 50 of the pairs of rollers 48 and 49 accordingly run perpendicular or obliquely to the horizontal 9. The flexible seal 47 consists of metallic elements 52 forming a flat surface 51 in the operating position.

Zwischen der gewölbten Auflage 44 und dem Transportband 5 wird ein Kühlmedium 53 unter Druck eingeführt. Das Transportband 5 wird außerdem im Bereich der Ausgießdüse 4 durch eine Führung 54 (Fig. 7) seitlich geführt, um Verschleiß zu der flexiblen Abdichtung 47 gering zu halten. Der gießseitigen Trommel 5b ist außerdem eine Reinigungseinrichtung 55 und eine Sprüheinrichtung 56 (Fig. 4) zugeordnet.A cooling medium 53 is introduced under pressure between the arched support 44 and the conveyor belt 5. The conveyor belt 5 is also guided laterally in the region of the pouring nozzle 4 by a guide 54 (FIG. 7) in order to keep wear to the flexible seal 47 low. A cleaning device 55 and a spray device 56 (FIG. 4) are also assigned to the casting-side drum 5b.

Zwischen der Ausgießdüse 4 des Vorratsbehälters 3, dem auf der Auflage 44 geführten, gekühlten Transportband 5, der Glättrolle 27 und der seitlichen, mitlaufenden Abdichtung 47 ist ein Gießraum 57 (Fig. 4) gebildet, der von einem inerten Gas, wie z.B. Argon oder Stickstoff, erfüllt ist und deshalb von einer Haube 58 (Fig. 5) umgeben ist, in die das inerte Gas durch eine Rohrleitung 59 eintritt und durch einen Spalt 60 ausströmt und somit den Luftsauerstoff von dem Gußband 1 während des Erstarrens fernhält.A pouring chamber 57 (FIG. 4) is formed between the pouring nozzle 4 of the storage container 3, the cooled conveyor belt 5 guided on the support 44, the smoothing roller 27 and the lateral, rotating seal 47, which is formed by an inert gas, e.g. Argon or nitrogen, is fulfilled and is therefore surrounded by a hood 58 (FIG. 5), into which the inert gas enters through a pipeline 59 and flows out through a gap 60 and thus keeps the atmospheric oxygen away from the cast strip 1 during solidification.

Claims (11)

1. Casting apparatus for casting strips of metal, In particular steel, comprising a supply vessel with a casting nozzle and a shaping device for the cast strip, with the supply vessel and the shaping device being mounted on a frame which is adjustable in its inclination to the horizontal, characterised in that the shaping device consists of a transportation belt (5) which passes across two spaced-apart rotationally drivable drums (5b, 5c) and which is cooled on one side, the nozzle mouth (6), the casting nozzle (4) and a concurrently running sealing means (47) which is laterally disposed at least in the vicinity of the casting nozzle (4), that the transportation belt (5) is supported on a support surface (44) between the drums (5b, 5c) and that a cooled smoothing roll (27) is located in the vicinity of the casting nozzle (4) at a distance from the plane (5a) of the transportation belt equal to the thickness (7) of the cast strip (1
2. Casting apparatus according to Claim 1, characterised in that the supply vessel (3) is adjustable in height and inclination to the plane (5a) of the transportation belt on the frame (32).
3. Casting apparatus according to Claim 1, characterised in that a carriage guide (37) for an adjustable carriage (38) is provided on the frame (32), on which carriage are disposed the supply vessel (3) and at least lifting means (39) for the supply vessel (3).
4. Casting apparatus according to Claims 1 to 3, characterised in that the support surface (44) has a constant profile (45) which runs above a tangent (46) laid on the peripheries of the drums.
5. Casting apparatus according to Claim 1, characterised in that the sealing means (4) is adapted to the path of the constant profile (45) of the support surface (44) or of the transportation belt (5) and has a height which is at least the thickness of the cooled transportation belt (5) together with the thickness (7) of the cast strip (1).
6. Casting apparatus according to one or more of Claims 1 to 5, characterised in that a cooling medium (53) can be introduced under pressure between the curved support surface (44) and the cooled transportation belt (5).
7. Casting apparatus according to Claims 1 to 6, characterised in that the casting-side drum (5b), which is disposed in the vicinity of the casting nozzle (4), is allocated a guide (54) for the cooled transportation belt (5).
8. Casting apparatus according to Claims 1 to 7, characterised in that the casting-side drum (5b) is allocated a cleaning or spray apparatus (55, 56) for applying black wash.
9. Casting apparatus according to Claims 1 to 8, characterised in that the lateral concurrently running sealing means (47) consists of metal elements (52) which form a plane surface (51) in the operating position.
10. Casting apparatus according to Claims 1 to 9, characterised in that a casting space (57) which is filled with inert gas is formed between the casting nozzle (4) of the supply vessel (3), the cooled transportation belt (5) which is guided on the support surface (44), the smoothing roll (27) and the lateral, concurrently running sealing means (47).
11. Casting apparatus according to Claims 1 to 10, characterised in that a cowling (58) which protects against oxidation is disposed in the direction of casting (10) adjoining the smoothing roller (27).
EP88730032A 1987-03-12 1988-02-11 Method and apparatus for casting metal strips, particularly steel ones Expired - Lifetime EP0283425B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873707897 DE3707897A1 (en) 1987-03-12 1987-03-12 METHOD AND CASTING DEVICE FOR CASTING METAL STRIPS, ESPECIALLY STEEL
DE3707897 1987-03-12

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EP0283425A1 EP0283425A1 (en) 1988-09-21
EP0283425B1 true EP0283425B1 (en) 1990-08-08

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US (1) US4836271A (en)
EP (1) EP0283425B1 (en)
JP (1) JPH0761527B2 (en)
AU (1) AU607970B2 (en)
BR (1) BR8801084A (en)
DE (1) DE3707897A1 (en)

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DE3810302A1 (en) * 1988-03-24 1989-10-12 Mannesmann Ag CASTING DEVICE FOR THE CONTINUOUS PRODUCTION OF METAL STRIP
DE4039959C1 (en) * 1990-12-14 1992-01-23 Wieland-Werke Ag, 7900 Ulm, De
CA2096365A1 (en) * 1992-06-23 1993-12-24 Donald G. Harrington Method and apparatus for continuous casting of metals
SE508311C2 (en) * 1995-08-16 1998-09-21 Mannesmann Ag Method and apparatus for directly casting thin metal strips
DE19636697C1 (en) * 1996-06-07 1997-08-14 Preussag Stahl Ag Casting nozzle used in plant for continuous casting of thin steel bands
US6112954A (en) * 1996-06-07 2000-09-05 Mannesmann Ag Casting nozzle for thin strip casting plants
DE19823440C1 (en) * 1998-05-19 1999-12-09 Mannesmann Ag Method and device for the near-dimensional casting of metal
KR20030085641A (en) * 2002-04-29 2003-11-07 김학배 A moulding device for nonferrous metal plate
KR20040023119A (en) * 2002-09-10 2004-03-18 김학배 A moulding device for nonferrous metal plate
DE102009031236B3 (en) * 2009-06-26 2010-12-02 Salzgitter Flachstahl Gmbh Producing steel strip by strip casting, comprises placing metal melt from feed vessel to rotating casting strip of horizontal strip casting system by casting groove and siphon-like outlet area formed as casting nozzle under protective gas
CN103286291B (en) * 2013-05-27 2015-04-29 平湖东创新材料科技有限公司 Plate forming device
CN112843860A (en) * 2020-12-23 2021-05-28 沧州华润化工有限公司 Environment-friendly and energy-saving galvanized plate finishing liquid mixing and spraying system
CN112893789B (en) * 2021-01-15 2022-08-30 台州学院 Device and method for producing semiconductor material foil

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US4646812A (en) * 1985-09-20 1987-03-03 Battelle Development Corporation Flow casting

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EP0283425A1 (en) 1988-09-21
DE3707897C2 (en) 1990-07-05
JPH01241358A (en) 1989-09-26
AU1217188A (en) 1988-09-15
BR8801084A (en) 1988-10-18
JPH0761527B2 (en) 1995-07-05
US4836271A (en) 1989-06-06
AU607970B2 (en) 1991-03-21
DE3707897A1 (en) 1988-09-22

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