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EP0045365B1 - Means for introducing molten metal into a continuous-casting mould having travelling walls - Google Patents

Means for introducing molten metal into a continuous-casting mould having travelling walls Download PDF

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Publication number
EP0045365B1
EP0045365B1 EP81104544A EP81104544A EP0045365B1 EP 0045365 B1 EP0045365 B1 EP 0045365B1 EP 81104544 A EP81104544 A EP 81104544A EP 81104544 A EP81104544 A EP 81104544A EP 0045365 B1 EP0045365 B1 EP 0045365B1
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EP
European Patent Office
Prior art keywords
gap
pouring body
walls
guide rails
mould
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.)
Expired
Application number
EP81104544A
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German (de)
French (fr)
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EP0045365A1 (en
Inventor
Dieter Dipl.-Ing. Figge
Jürgen Dr.-Ing. Hartwig
Dieter Dr.-Ing. Neuschütz
Jürgen Dr.-Ing. Pötschke
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Fried Krupp AG
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Fried Krupp AG
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Publication date
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Priority to AT81104544T priority Critical patent/ATE6215T1/en
Publication of EP0045365A1 publication Critical patent/EP0045365A1/en
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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
    • B22D11/064—Accessories therefor for supplying molten metal

Definitions

  • the invention relates to a metal inlet in continuous casting devices, according to the preamble of claim 1 CH-A-508 433.
  • Such known continuous casting devices can be operated with good results, in particular when the metal inlet is closed to the outside, since the access of air to the liquid metal can be prevented and the regulation of the amount of metal supplied can be controlled, in particular at high casting speeds. Difficulties arise in the area of the fixed casting body in that it has to be sealed against the mold walls moving in the casting direction in order to avoid the escape of liquid metal to the outside.
  • a nozzle for supplying molten metal during strip casting in caterpillar molds is known, the part of which comes into contact with the casting metal consists of a heat-resistant and chemically resistant material with poor thermal conductivity.
  • the nozzle mouthpiece is all-round, i.e. around its entire circumference with inserts made of a self-lubricating material These protrude from the surface of the mouthpiece just enough to prevent any direct contact between the nozzle surface and the mold halves, and on the other hand to prevent casting metal from penetrating into the play between the mouthpiece and the mold halves.
  • the order of magnitude for the play between the mouthpiece and the mold halves is in the range between 0.2 to 0.3 mm, the dimension of 0.3 mm being at the upper limit in terms of preventing the penetration of molten metal.
  • the FR-PS 1 094517 describes a generic metal inlet, the cast body - apart from a metallic jacket, if necessary - consist of a refractory material with low thermal conductivity and is supported by several guide rails on the walls of the mold, which is designed as a rigid body.
  • the mold walls are optionally covered with graphite in the area of the casting body, i.e. with a good heat-conducting material, lined.
  • the technical problem on which the invention is based is that the forces acting between the molten metal and the mold material or cast-in body necessitate very small gap dimensions for a purely mechanical seal; at the high casting temperatures, particularly for copper and steel and their high aggressiveness for refractory materials, these cannot be maintained over the necessary period of a few hours.
  • the liquid metal entering the gap between the mold walls and the casting body could have a sealing effect when it solidified completely; however, this solidification process is undesirable and disadvantageous, since the metal which has just solidified is continuously torn out of the gap or else grinds on the moving mold walls and would thus damage their surface. This would result in destruction of the metal skin just created, a poor surface of the cast product and possibly damage to the continuous casting device.
  • the invention then includes the finding that a continuous casting process under stationary conditions is only possible if no bridge of solidified metal is formed in the gap between the facing surfaces of the mold walls and the casting body. It is therefore important to prevent the metal from solidifying on the casting body, since otherwise there is a risk of bridging to the mold. So that the onset of solidification does not reach the casting body, i.e.
  • the mold walls are equipped with a suitable heat-insulating coating and move so quickly relative to the casting body that the gap area filled with liquid metal only as much metal flows as is consumed by solidification and is removed by the movement of the mold walls: between the mold walls and at least the outlet area of the casting body, there is always a two-phase area in which the metal flowing into the gap is just consumed by solidification in the solidification area.
  • the invention thus conveys the teaching that the gap between the casting body and the moving mold walls can be automatically sealed by solidifying metal, provided that the material properties and the geometric relationships of the components to be sealed against one another, depending on the speed of the mold walls, caused by the setting of the gap are coordinated with one another such that the amount of metal flowing into the gap corresponds to the amount of solidified metal conveyed out of the gap with the mold walls.
  • the subject of the invention therefore requires a movement of the mold walls which is coordinated with the gap dimension, since only then does the liquid region in the gap remain by maintaining a balance between the quantity of liquid metal supplied and the quantity of solidifying metal discharged. Since liquid metal is allowed to flow into the gap, this shows considerably, depending on the speed of the mold walls, among other things larger dimensions than the previously known comparable devices.
  • Powder and alcoholic suspensions based on glass, slag, graphite, ceramic-graphite are used in particular as coating materials for the mold walls; however, the coating can also be produced using suitable salts, fats and oils.
  • the gap in the subject of the invention is set so that it is more than 0.3 mm and at most up to 2 mm.
  • Preferred embodiments are characterized in that the gap is not larger than 1.5 or 1 mm (claims 2 and 3).
  • the mutually facing walls of the mold and the casting body are advantageously designed and arranged in such a way that they run parallel to one another at least in the outlet region of the casting body.
  • the gap between the casting body and the moving mold walls is preferably set to a value between 0.5 and 1 mm, the speed of the mold walls being between 10 and 20 meters per minute (claim 4).
  • Such an embodiment is particularly suitable for casting steel.
  • the guide rails can in particular also be movably guided in the casting body using spring elements.
  • the guide rails can be height-adjustable within the cast body, in particular by adjusting wedges or similar remote-controlled lifting devices.
  • the guide rails are expediently designed to be relatively narrow on the side facing the mold walls; their width transverse to the longitudinal direction of the cast body is preferably not more than five millimeters (claim 7).
  • the outlet region of the casting body is equipped with a bore which widens in the shape of a funnel; the wall of the bore advantageously has a convex curvature, but under certain circumstances also a straight line or concave curvature.
  • the curvature of the outlet area which is tailored to the casting problem, optimally achieves the following goals: high mechanical stability of the pouring area of the pouring body, sufficiently high heat capacity and heat conduction to the outside, i.e. in the direction of the mold, and extensive calming of the turbulent flow.
  • the outlet area and the remaining area of the casting body are expediently connected to one another in a manner which permits thermally induced dimensional changes (claim 13); in particular, the two areas of the casting body can be fastened to one another by plug connections.
  • Si 3 N 4 , BN or cermet are used in particular as suitable materials for the exit area; the rest of the casting body can be made in particular of refractory high-alumina ceramic, such as silimanite stone.
  • the above-mentioned connection which allows displacements is particularly advantageous if the outlet region of the cast-in body - in contrast to its remaining region - consists of a material with good thermal conductivity (claim 16).
  • the gap in the outlet region of the casting body is advantageously filled with inert gas; the inert gas pressure is chosen so that its size is slightly below that of the metallostatic pressure of the melt in the outlet area (claim 14). Since the inert gas pressure is always lower than the already mentioned metallostatic pressure of the melt, the inert gas cannot get into the liquid metal and into the casting line.
  • An embodiment of the subject matter of the invention with an inert gas seal preferably additionally has the features of claim 15.
  • the metal inlet according to the invention has, as essential components, band-shaped mold walls 2 moved in the direction of arrow 1 and a fixed casting body 3, which in turn is composed of an outlet area 4 and a rear remaining area 5.
  • the areas 4 and 5 consist of a material with good (area 4) or with low (area 5) thermal conductivity.
  • the liquid metal to be cast is introduced in the direction of arrow 6 through a bore 7 in the casting body 3 between the moving mold walls 2; the solidification range emanating from this is denoted by 8.
  • the operating conditions prevailing during the casting process are therefore selected such that just as much liquid metal flows in through the gap-shaped liquid region 8 'as there is after the solidification of the mold walls 2 by their movement to the right (arrow 1).
  • the casting body 3 on the side facing the mold walls 2 (that is to say in the area of the outer surfaces 4 'and 5' in FIG. 1) is equipped with guide rails 10 on which support the mold walls 2 with a low preload (see Fig. 2).
  • the width b of these guide rails is preferably not more than five millimeters, their mutual distance a transverse to the longitudinal direction of the cast body 3 is not more than two hundred millimeters.
  • the guide rails 10 In order to be able to change the guiding effect of the guide rails 10, if necessary, they can be held in an adjustable manner in the casting body 3, in a modification of the embodiment shown in FIG. 2; In addition, it is possible to arrange the guide rails 10 movably in the casting body 3 with the interposition of spring elements.
  • the guide rails 10 - viewed in the direction of the longitudinal axis 7 '(or in the direction of the arrows 1 and 6) - come as close as possible to the exit edge 4 "of the exit area 4; however, their distance from this exit edge must be such that that they are in any case outside the solidification area 8 indicated in FIG. 1 - which extends into the gap 9.
  • the distance c of the front edges of the guide rails 10 from the trailing edge 4 is therefore not less than thirty millimeters (cf. FIG. 1).
  • the outlet area 4 of the casting body 3 is equipped with an annular channel 11, through which inert gas is guided into the gap between the components 2 and 4.
  • the ring channel 11 is connected via a feed line 12 to an inert gas source, not shown.
  • the pressure of the inert gas is dimensioned such that it is constantly slightly below the value of the metallostatic pressure in the melt in the area of the exit edge 4 "of the exit area 4.
  • the inert gas present prevents the melt from penetrating too far into the gap between the components 2 and 4, without the risk of storing inert gas in the casting line.
  • the ring channel 11 On the rear side facing away from the trailing edge 4 ′′, the ring channel 11 is closed by a seal 13 which is in contact with the mold walls 2 at the same time.
  • the subject matter of the invention is not limited to use in connection with belt-shaped mold walls; it can also interact with mold walls of a different design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Catching Or Destruction (AREA)
  • Feeding And Watering For Cattle Raising And Animal Husbandry (AREA)
  • Dental Prosthetics (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

1. A metal inlet of a continuous casting apparatus, comprising a stationary fire resistant pouring body (3) partially surrounded by a mould havign walls (2) movable in the castin direction, whereby a gap (9) is provided between the facing surfaces of the mould walls and the pouring body at least at the outlet portion (4) of the latter, characterized in that the mould walls (2) have a thermally insulating layer, the gap (9) amounts to more than 0,3 mm to 2 mm and the speed of the mould walls is such that a zone (8') filled with liquid metal is present in the gap between the solidification range (8) formed from the mould walls (2) and the pouring body (3).

Description

Die Erfindung bezieht sich auf einen Metalleinlauf in Stranggiessvorrichtungen, nach dem Oberbegriff des Anspruchs 1 CH-A-508 433.The invention relates to a metal inlet in continuous casting devices, according to the preamble of claim 1 CH-A-508 433.

Derartige bekannte Stranggiessvorrichtungen lassen sich insbesondere bei nach aussen hin abgeschlossenem Metalleinlauf mit gutem Ergebnis betreiben, da der Zutritt von Luft zum flüssigen Metall verhinderbar und die Regelung der zugeführten Metallmenge insbesondere bei hohen Giessgeschwindigkeiten beherrschbar ist. Schwierigkeiten entstehen im Bereich des feststehenden Eingusskörpers dadurch, dass dieser gegen die in Giessrichtung bewegten Kokillenwände abgedichtet sein muss, um das Austreten flüssigen Metalls nach aussen zu vermeiden.Such known continuous casting devices can be operated with good results, in particular when the metal inlet is closed to the outside, since the access of air to the liquid metal can be prevented and the regulation of the amount of metal supplied can be controlled, in particular at high casting speeds. Difficulties arise in the area of the fixed casting body in that it has to be sealed against the mold walls moving in the casting direction in order to avoid the escape of liquid metal to the outside.

Aus der CH-A 508 433 ist eine Düse für die Zuführung geschmolzenen Metalls beim Bandgiessen in Raupenkokillen bekannt, deren mit dem Giessmetall in Berührung kommender Teil aus einem hitzebeständigen und chemisch widerstandsfähigen Werkstoff schlechter Wärmeleitfähigkeit besteht. Das Mundstück der Düse ist allseitig, d.h. um seinen ganzen Umfang, mit Einlagen aus einem selbstschmierenden Werkstoff versehen; diese stehen aus der Oberfläche des Mundstücks gerade so weit hervor, dass einerseits jede direkte Berührung der Düsenoberfläche mit den Kokillenhälften und andererseits ein Eindringen von Giessmetall in das Spiel zwischen Mundstück und Kokillenhälften verhindert ist. Die Grössenordnung für das Spiel zwischen Mundstück und Kokillenhälften liegt in dem Bereich zwischen 0,2 bis 0,3 mm, wobei das Mass von 0,3 mm sich hinsichtlich der Verhinderung des Eindringens von Metallschmelze an der oberen Grenze befindet.From CH-A 508 433 a nozzle for supplying molten metal during strip casting in caterpillar molds is known, the part of which comes into contact with the casting metal consists of a heat-resistant and chemically resistant material with poor thermal conductivity. The nozzle mouthpiece is all-round, i.e. around its entire circumference with inserts made of a self-lubricating material These protrude from the surface of the mouthpiece just enough to prevent any direct contact between the nozzle surface and the mold halves, and on the other hand to prevent casting metal from penetrating into the play between the mouthpiece and the mold halves. The order of magnitude for the play between the mouthpiece and the mold halves is in the range between 0.2 to 0.3 mm, the dimension of 0.3 mm being at the upper limit in terms of preventing the penetration of molten metal.

Die FR-PS 1 094517 beschreibt einen gattungsgemässen Metalleinlauf, dessen Eingusskörper - abgesehen ggf. von einem metallischen Mantel - durchgehend aus einem feuerfesten Werkstoff mit geringer Wärmeleitfähigkeit besteht und sich über mehrere Führungsschienen an den Wänden der als in sich starrer Körper ausgebildeten Kokille abstützt. Die Kokillenwände sind im Bereich des Eingusskörpers gegebenenfalls mit Graphit, d.h. mit einem gut wärmeleitenden Werkstoff, ausgekleidet.The FR-PS 1 094517 describes a generic metal inlet, the cast body - apart from a metallic jacket, if necessary - consist of a refractory material with low thermal conductivity and is supported by several guide rails on the walls of the mold, which is designed as a rigid body. The mold walls are optionally covered with graphite in the area of the casting body, i.e. with a good heat-conducting material, lined.

Wie der oben erläuterte Stand der Technik erkennen lässt, besteht das der Erfindung zugrunde liegende technische Problem darin, dass die zwischen Metallschmelze und Kokillenwerkstoff bzw. Eingusskörper werkstoffwirkenden Kräfte für eine rein mechanische Abdichtung sehr kleine Spaltabmessungen erforderlich machen; diese lassen sich bei den hohen Giesstemperaturen insbesondere für Kupfer und Stahl und deren hohe Aggressivität für feuerfeste Werkstoffe nicht über den notwendigen Zeitraum von einigen Stunden aufrechterhalten. Das in den Spalt zwischen Kokillenwänden und dem Eingusskörper gelangende flüssige Metall könnte zwar bei seiner vollständigen Erstarrung abdichtend wirken; dieser Erstarrungsvorgang ist jedoch unerwünscht und nachteilig, da das gerade erstarrte Metall fortlaufend aus dem Spalt herausgerissen oder aber auf den bewegten Kokillenwänden schleifen und somit deren Oberfläche beschädigen würde. Dies hätte eine Zerstörung der gerade entstandenen Metallhaut, eine schlechte Oberfläche des Giesserzeugnisses sowie gegebenenfalls eine Beschädigung der Stranggiessvorrichtung zur Folge.As can be seen from the prior art explained above, the technical problem on which the invention is based is that the forces acting between the molten metal and the mold material or cast-in body necessitate very small gap dimensions for a purely mechanical seal; at the high casting temperatures, particularly for copper and steel and their high aggressiveness for refractory materials, these cannot be maintained over the necessary period of a few hours. The liquid metal entering the gap between the mold walls and the casting body could have a sealing effect when it solidified completely; however, this solidification process is undesirable and disadvantageous, since the metal which has just solidified is continuously torn out of the gap or else grinds on the moving mold walls and would thus damage their surface. This would result in destruction of the metal skin just created, a poor surface of the cast product and possibly damage to the continuous casting device.

Die gestellte Aufgabe wird durch einen Metalleinlauf der eingangs genannten Gattung gelöst, der im wesentlichen zumindest die Merkmale des Anspruchs 1 aufweist.The stated object is achieved by a metal inlet of the type mentioned at the outset, which essentially has at least the features of claim 1.

Die Erfindung beinhaltet danach die Erkenntnis, dass ein kontinuierlicher Giessprozess unter stationären Bedingungen nur dann möglich ist, wenn in dem Spalt zwischen den einander zugewandten Flächen der Kokillenwände und des Eingusskörpers keine Brücke aus erstarrtem Metall gebildet wird. Es kommt daher darauf an, die Erstarrung des Metalls am Eingusskörper zu verhindern, da andernfalls die Gefahr einer Brückenbildung zur Kokille besteht. Damit die beginnende Erstarrung nicht den Eingusskörper erreicht, also zwischen diesem und den Kokillenwänden ein mit flüssigem Metall angefüllter Flüssigbereich aufrechterhalten bleibt, sind die Kokillenwände mit einer geeigneten wärmedämmenden Beschichtung ausgestattet und bewegen sich relativ zum Eingusskörper so schnell, dass in den mit flüssigem Metall angefüllten Spaltbereich nur soviel Metall fliesst, wie durch Erstarren verbraucht und durch die Bewegung der Kokillenwände abgeführt wird: Zwischen den Kokillenwänden und zumindest dem Austrittsbereich des Eingusskörpers ist also stets ein Zweiphasenbereich vorhanden, in dem das in den Spalt einströmende Metall durch Erstarrung im Erstarrungsbereich gerade aufgezehrt wird.The invention then includes the finding that a continuous casting process under stationary conditions is only possible if no bridge of solidified metal is formed in the gap between the facing surfaces of the mold walls and the casting body. It is therefore important to prevent the metal from solidifying on the casting body, since otherwise there is a risk of bridging to the mold. So that the onset of solidification does not reach the casting body, i.e. a liquid area filled with liquid metal is maintained between it and the mold walls, the mold walls are equipped with a suitable heat-insulating coating and move so quickly relative to the casting body that the gap area filled with liquid metal only as much metal flows as is consumed by solidification and is removed by the movement of the mold walls: between the mold walls and at least the outlet area of the casting body, there is always a two-phase area in which the metal flowing into the gap is just consumed by solidification in the solidification area.

Die Erfindung vermittelt also die Lehre, dass der Spalt zwischen dem Eingusskörper und den bewegten Kokillenwänden selbsttätig durch erstarrendes Metall abdichtbar ist, sofern die Materialeigenschaften und die durch die Einstellung des Spalts bedingten geometrischen Verhältnisse der gegeneinander abzudichtenden Bestandteile in Abhängigkeit von der Geschwindigkeit der Kokillenwände gerade so aufeinander abgestimmt sind, dass die in den Spalt einströmende Metallmenge der mit den Kokillenwänden aus dem Spalt herausgeförderten erstarrten Metallmenge entspricht.The invention thus conveys the teaching that the gap between the casting body and the moving mold walls can be automatically sealed by solidifying metal, provided that the material properties and the geometric relationships of the components to be sealed against one another, depending on the speed of the mold walls, caused by the setting of the gap are coordinated with one another such that the amount of metal flowing into the gap corresponds to the amount of solidified metal conveyed out of the gap with the mold walls.

Der Erfindungsgegenstand setzt also, im Gegensatz zum Stand der Technik, eine mit der Spaltabmessung abgestimmte Bewegung der Kokillenwände voraus, da nur dann der in dem Spalt befindliche Flüssigbereich durch Aufrechterhalten eines Gleichgewichts zwischen der Zuführmenge an flüssigem Metall und der Abführmenge an erstarrendem Metall bestehen bleibt. Da das Einfliessen flüssigen Metalls in den Spalt zugelassen wird, weist dieser-abhängig u.a. von der Geschwindigkeit der Kokillenwände - erheblich grössere Abmessungen auf als die bisher bekannten vergleichbaren Einrichtungen.In contrast to the prior art, the subject of the invention therefore requires a movement of the mold walls which is coordinated with the gap dimension, since only then does the liquid region in the gap remain by maintaining a balance between the quantity of liquid metal supplied and the quantity of solidifying metal discharged. Since liquid metal is allowed to flow into the gap, this shows considerably, depending on the speed of the mold walls, among other things larger dimensions than the previously known comparable devices.

Als Beschichtungswerkstoffe für die Kokillenwände kommen insbesondere Pulver und alkohotische Suspensionen auf Glas-, Schlacke-, Graphit-, Keramik-Graphit-Basis zur Anwendung; die Beschichtung kann jedoch auch unter Verwendung geeigneter Salze, Fette und Öle hergestellt sein.Powder and alcoholic suspensions based on glass, slag, graphite, ceramic-graphite are used in particular as coating materials for the mold walls; however, the coating can also be produced using suitable salts, fats and oils.

Der Spalt ist beim Erfindungsgegenstand so eingestellt, dass er mehr als 0,3 mm und allenfalls bis 2 mm beträgt. Bevorzugte Ausführungsformen sind dadurch gekennzeichnet, dass der Spalt nicht grösser ist als 1,5 bzw. 1 mm (Anspruch 2 bzw. 3).The gap in the subject of the invention is set so that it is more than 0.3 mm and at most up to 2 mm. Preferred embodiments are characterized in that the gap is not larger than 1.5 or 1 mm (claims 2 and 3).

Die einander zugewandten Wände der Kokille und des Eingusskörpers sind vorteilhafterweise so ausgebildet und angeordnet, dass sie zumindest im Austrittsbereich des Eingusskörpers parallel zueinander verlaufen.The mutually facing walls of the mold and the casting body are advantageously designed and arranged in such a way that they run parallel to one another at least in the outlet region of the casting body.

Vorzugsweise ist der Spalt zwischen dem Eingusskörper und den bewegten Kokillenwänden auf einen Wert zwischen 0,5 bis 1 mm eingestellt, wobei die Geschwindigkeit der Kokillenwände zwischen 10 bis 20 Meter pro Minute beträgt (Anspruch 4). Eine derartig ausgebildete Ausführungsform ist insbesondere zum Vergiessen von Stahl geeignet.The gap between the casting body and the moving mold walls is preferably set to a value between 0.5 and 1 mm, the speed of the mold walls being between 10 and 20 meters per minute (claim 4). Such an embodiment is particularly suitable for casting steel.

Infolge der hohen Wärmebelastung der Kokillenwände stellt deren Verwerfung, durch welche der Abstand zum Eingusskörper verändert wird, ein besonderes Problem dar. Um diesen Abstand, das heisst die Spaltbreite, möglichst konstant auf dem gewünschten Wert zu halten, ist es zweckmässig, Führungsschienen vorzusehen, an denen sich die Kokillenwände mit geringer Vorspannung abstützen (Anspruch 5). Die vorteilhaft aus dem Werkstoff des Eingusskörpers bestehenden Führungsschienen (Anspruch 11 ) können fest mit dem Eingusskörper verbunden sein, sind aber zweckmässigerweise derart beweglich (Anspruch 10) in diesem gehalten, dass entweder ein gewünschter Abstand zwischen Kokille und Eingusskörper während des Giessvorgangs erhalten bleibt oder dass der Abstand zwischen den beiden genannten Bestandteilen in dem gewünschten Umfang verändert werden kann.As a result of the high thermal load on the mold walls, their warping, by means of which the distance to the casting body is changed, is a particular problem. In order to keep this distance, ie the gap width, as constant as possible at the desired value, it is advisable to provide guide rails which the mold walls are supported with low pretension (claim 5). The advantageously made of the material of the casting body guide rails (claim 11) can be firmly connected to the casting body, but are expediently movable (claim 10) in this that either a desired distance between the mold and the casting body is maintained during the casting process or that the distance between the two components mentioned can be changed to the desired extent.

Die Führungsschienen können insbesondere auch unter Verwendung von Federelementen beweglich im Eingusskörper geführt sein. Bei einer besonders bevorzugten Ausführungsform des Erfindungsgegenstandes ist es möglich, die Lage der Führungsschienen bezüglich der Kokillenwände von aussen zu verstellen; zu diesem Zweck können die Führungsschienen insbesondere durch Verstellkeile oder ähnliche fernbedienbare Hubeinrichtungen innerhalb des Eingusskörpers höhenverstellbar sein.The guide rails can in particular also be movably guided in the casting body using spring elements. In a particularly preferred embodiment of the subject matter of the invention, it is possible to adjust the position of the guide rails with respect to the mold walls from the outside; For this purpose, the guide rails can be height-adjustable within the cast body, in particular by adjusting wedges or similar remote-controlled lifting devices.

Zweckmässigerweise sind die Führungsschienen auf der den Kokillenwänden zugewandten Seite verhältnismässig schmal ausgebildet; ihre Breite quer zur Längsrichtung des Eingusskörpers beträgt vorzugsweise nicht mehr als fünf Millimeter (Anspruch 7).The guide rails are expediently designed to be relatively narrow on the side facing the mold walls; their width transverse to the longitudinal direction of the cast body is preferably not more than five millimeters (claim 7).

Es hat sich weiterhin als vorteilhaft erwiesen, die Führungsschienen so anzuordnen, dass ihr Grösstabstand voneinander quer zur Längsrichtung des Eingusskörpers zweihundert Millimeter beträgt (Anspruch 6). Um eine Brückenbildung zwischen den Kokillenwänden und dem Eingusskörper zu vermeiden, nähern sich die Führungsschienen der Austrittkante des Eingusskörpers allenfalls bis auf dreissig (Anspruch 8) bzw. bis auf fünfzig Millimeter (Anspruch 9).It has also proven to be advantageous to arrange the guide rails in such a way that their size bar spacing from one another transversely to the longitudinal direction of the cast body is two hundred millimeters (claim 6). In order to avoid bridging between the mold walls and the casting body, the guide rails approach the trailing edge of the casting body at most up to thirty (claim 8) or up to fifty millimeters (claim 9).

Bei einer besonders bevorzugten Ausgestaltung des Erfindungsgegenstandes ist der Austrittsbereich des Eingusskörpers mit einer sich in Giessrichtung trichterförmig erweiternden Bohrung ausgestattet; die Bohrungswandung verläuft vorteilhaft konvex-gekrümmt, unter Umständen jedoch auch geradlinig oder konkav-gekrümmt. Durch die auf das Giessproblem abgestimmte Krümmung des Austrittsbereiches werden die folgenden Ziele optimal erreicht: Hohe mechanische Stabilität des Eingussbereiches des Eingusskörpers, ausreichend hohe Wärmekapazität und Wärmeleitung nach aussen, das heisst in Richtung Kokille, und weitgehende Beruhigung der turbulenten Strömung.In a particularly preferred embodiment of the subject matter of the invention, the outlet region of the casting body is equipped with a bore which widens in the shape of a funnel; the wall of the bore advantageously has a convex curvature, but under certain circumstances also a straight line or concave curvature. The curvature of the outlet area, which is tailored to the casting problem, optimally achieves the following goals: high mechanical stability of the pouring area of the pouring body, sufficiently high heat capacity and heat conduction to the outside, i.e. in the direction of the mold, and extensive calming of the turbulent flow.

Der Austrittsbereich und der Restbereich des Eingusskörpers sind zweckmässig in einer Weise miteinander verbunden, die thermisch bedingte Abmessungsänderungen zulässt (Anspruch 13); insbesondere können die beiden Bereiche des Eingusskörpers durch Steckverbindungen aneinander befestigt sein. Als geeignete Werkstoffe für den Austrittsbereich kommen insbesondere Si3N4, BN oder Cermet zur Anwendung; der Restbereich des Eingusskörpers kann insbesondere aus feuerfester hochtonerdehaltiger Keramik hergestellt sein, wie beispielsweise Silimanitstein. Die erwähnte, Verschiebungen zulassende Verbindung ist insbesondere dann von Vorteil, wenn der Austrittsbereich des Eingusskörpers - im Gegensatz zu dessen Restbereich - aus einem Werkstoff mit guter Wärmeleitfähigkeit besteht (Anspruch 16).The outlet area and the remaining area of the casting body are expediently connected to one another in a manner which permits thermally induced dimensional changes (claim 13); in particular, the two areas of the casting body can be fastened to one another by plug connections. Si 3 N 4 , BN or cermet are used in particular as suitable materials for the exit area; the rest of the casting body can be made in particular of refractory high-alumina ceramic, such as silimanite stone. The above-mentioned connection which allows displacements is particularly advantageous if the outlet region of the cast-in body - in contrast to its remaining region - consists of a material with good thermal conductivity (claim 16).

Um zu verhindern, dass das flüssige Metall zu weit in den Spalt zwischen der Kokille und dem Eingusskörper eindringt, ist der Spalt im Austrittsbereich des Eingusskörpers vorteilhaft mit Inertgas gefüllt; der Inertgasdruck ist dabei so gewählt, dass seine Grösse geringfügig unterhalb derjenigen des metallostatischen Drucks der Schmelze im Austrittsbereich liegt (Anspruch 14). Da der Inertgasdruck stets kleiner ist als der bereits erwähnte metallostatische Druck der Schmelze, kann das Inertgas nicht in das flüssige Metall und in den Giessstrang gelangen. Eine Ausführungsform des Erfindungsgegenstandes mit Inertgas-Abdichtung weist vorzugsweise zusätzlich die Merkmale des Anspruchs 15 auf.In order to prevent the liquid metal from penetrating too far into the gap between the mold and the casting body, the gap in the outlet region of the casting body is advantageously filled with inert gas; the inert gas pressure is chosen so that its size is slightly below that of the metallostatic pressure of the melt in the outlet area (claim 14). Since the inert gas pressure is always lower than the already mentioned metallostatic pressure of the melt, the inert gas cannot get into the liquid metal and into the casting line. An embodiment of the subject matter of the invention with an inert gas seal preferably additionally has the features of claim 15.

Die Erfindung wird nachfolgend anhand zweier in der Zeichnung dargestellter bevorzugter Ausführungsbeispiele im einzelnen erläutert.

  • Fig. 1 schematisch einen Längs-Teilschnitt durch den erfindungsgemässen Metalleinlauf im Austrittsbereich des Eingusskörpers,
  • Fig. 2 in gegenüber Fig. 1 verkleinertem Massstab einen Teilschnitt durch den mit mehreren nebeneinander liegenden Führungsschienen ausgestatteten Eingusskörper quer zu dessen Längserstreckung und
  • Fig. 3 schematisch einen Längsschnitt durch einen erfindungsgemässen Metalleinlauf, dessen Eingusskörper im Austrittsbereich mit einem Inertgaskanal ausgestattet ist.
The invention is explained in detail below with reference to two preferred exemplary embodiments shown in the drawing.
  • 1 schematically shows a longitudinal partial section through the metal inlet according to the invention in the outlet area of the casting body,
  • Fig. 2 on a reduced scale compared to Fig. 1, a partial section through the cast body equipped with a plurality of guide rails lying side by side transversely to its longitudinal extent and
  • 3 schematically shows a longitudinal section through a metal inlet according to the invention, the casting body of which is equipped with an inert gas channel in the outlet area.

Der erfindungsgemässe Metalleinlauf weist als wesentliche Bestandteile in Richtung des Pfeiles 1 bewegte bandförmige Kokillenwände 2 und einen feststehenden Eingusskörper 3 auf, der seinerseits aus einem Austrittsbereich 4 und einem rückwärtigen Restbereich 5 zusammengesetzt ist. Die Bereiche 4 und 5 bestehen aus einem Werkstoff mit guter (Bereich 4) bzw. mit geringer (Bereich 5) Wärmeleitfähigkeit.The metal inlet according to the invention has, as essential components, band-shaped mold walls 2 moved in the direction of arrow 1 and a fixed casting body 3, which in turn is composed of an outlet area 4 and a rear remaining area 5. The areas 4 and 5 consist of a material with good (area 4) or with low (area 5) thermal conductivity.

Das zu vergiessende flüssige Metall wird in Richtung des Pfeiles 6 durch eine Bohrung 7 im Eingusskörper 3 zwischen die sich bewegenden Kokillenwände 2 eingeleitet; der von diesen ausgehende Erstarrungsbereich ist mit 8 bezeichnet. Die Bohrung 7 mit der Längsachse 7' erweitert sich im Austrittsbereich 4 mit der Aussenfläche 4' und derAustrittskante4" in Giessrichtung (Pfeil 6) trichterförmig.The liquid metal to be cast is introduced in the direction of arrow 6 through a bore 7 in the casting body 3 between the moving mold walls 2; the solidification range emanating from this is denoted by 8. The bore 7 with the longitudinal axis 7 'widens in the outlet area 4 with the outer surface 4' and the outlet edge 4 "in the pouring direction (arrow 6).

Zur Abdichtung des Spaltes 9 zwischen den Kokillenwänden 1 und der Aussenfläche 4' bzw. 5' der Bereiche 4 und 5 des Eingusskörpers 3 wird dafür Sorge getragen, dass der Abstand zwischen den Bestandteilen 2 und 3 stets etwa 0,7 Millimeter beträgt. Darüber hinaus sind die Kokillenwände 2 - die sich mit einer Geschwindigkeit von etwa 17 Meter pro Minute bewegen - so beschichtet, dass die beginnende Erstarrung (Erstarrungsbereich 8) nicht den Eingusskörper 3 bzw. dessen Austrittsbereich 4 erreicht, sondern ein mit flüssigem Metall angefüllter spaltförmiger Flüssigbereich 8' aufrechterhalten bleibt. Die Aufrechterhaltung dieses Flüssigbereiches 8' hat zur Folge, dass im Spalt 9 zwischen den Bestandteilen 2 und 3 keine Brücke aus erstarrtem Metall gebildet wird. Die während des Giessvorgangs herrschenden Betriebsbedingungen (Spaltbreite, Beschichtung der Kokillenwände, Geschwindigkeit der Kokillenwände) sind also derart gewählt, dass durch den spaltförmigen Flüssigbereich 8' immer gerade so viel flüssiges Metall nach links nachströmt, wie nach dem Erstarren an den Kokillenwänden 2 durch deren Bewegung nach rechts (Pfeil 1 ) abgeführt wird.To seal the gap 9 between the mold walls 1 and the outer surface 4 'or 5' of the areas 4 and 5 of the casting body 3, care is taken that the distance between the components 2 and 3 is always about 0.7 millimeters. In addition, the mold walls 2 - which move at a speed of about 17 meters per minute - are coated in such a way that the beginning solidification (solidification area 8) does not reach the casting body 3 or its exit area 4, but rather a gap-like liquid area filled with liquid metal 8 'is maintained. The maintenance of this liquid region 8 'has the consequence that no bridge of solidified metal is formed in the gap 9 between the components 2 and 3. The operating conditions prevailing during the casting process (gap width, coating of the mold walls, speed of the mold walls) are therefore selected such that just as much liquid metal flows in through the gap-shaped liquid region 8 'as there is after the solidification of the mold walls 2 by their movement to the right (arrow 1).

Um sicherzustellen, dass die Spaltbreite in der gewünschten Grösse ständig erhalten bleibt, ist der Eingusskörper 3 auf der den Kokillenwänden 2 zugewandten Seite (das heisst im Bereich der Aussenflächen 4' und 5' in Fig. 1) mit Führungsschienen 10 ausgestattet, an denen sich die Kokillenwände 2 mit geringer Vorspannung abstützen (vgl. Fig. 2). Die Breite b dieser Führungsschienen beträgt vorzugsweise nicht mehr als fünf Millimeter, ihr gegenseitiger Abstand a quer zur Längsrichtung des Eingusskörpers 3 nicht mehr als zweihundert Millimeter.In order to ensure that the gap width of the desired size is maintained at all times, the casting body 3 on the side facing the mold walls 2 (that is to say in the area of the outer surfaces 4 'and 5' in FIG. 1) is equipped with guide rails 10 on which support the mold walls 2 with a low preload (see Fig. 2). The width b of these guide rails is preferably not more than five millimeters, their mutual distance a transverse to the longitudinal direction of the cast body 3 is not more than two hundred millimeters.

Um die Führungswirkung der Führungsschienen 10 gegebenenfalls verändern zu können, können diese - in Abänderung der in Fig. 2 dargestellten Ausführungsform - verstellbar im Eingusskörper 3 gehalten sein; darüber hinaus ist es möglich, die Führungsschienen 10 unter Zwischenschaltung von Federelementen beweglich im Eingusskörper 3 anzuordnen.In order to be able to change the guiding effect of the guide rails 10, if necessary, they can be held in an adjustable manner in the casting body 3, in a modification of the embodiment shown in FIG. 2; In addition, it is possible to arrange the guide rails 10 movably in the casting body 3 with the interposition of spring elements.

Die Mittelebene des Eingusskörpers 3 quer zur Längsachse 7' ist in Fig. 2 mit 7" bezeichnet.The center plane of the casting body 3 transversely to the longitudinal axis 7 'is designated by 7 "in FIG. 2.

Zweckmässigerweise reichen die Führungsschienen 10 - in Richtung der Längsachse 7' (bzw. in Richtung der Pfeile 1 und 6) gesehen - so nah wie möglich an die Austrittskante 4" des Austrittsbereichs 4 heran; ihr Abstand von dieser Austrittskante muss jedoch so bemessen sein, dass sie in jedem Falle ausserhalb des in Fig. 1 angedeuteten Erstarrungsbereiches 8 - der in den Spalt 9 hineinreicht- liegen.Advantageously, the guide rails 10 - viewed in the direction of the longitudinal axis 7 '(or in the direction of the arrows 1 and 6) - come as close as possible to the exit edge 4 "of the exit area 4; however, their distance from this exit edge must be such that that they are in any case outside the solidification area 8 indicated in FIG. 1 - which extends into the gap 9.

Der Abstand c der Vorderkanten der Führungsschienen 10 von der Austrittskante 4" ist daher nicht kleiner als dreissig Millimeter (vgl. Fig. 1).The distance c of the front edges of the guide rails 10 from the trailing edge 4 "is therefore not less than thirty millimeters (cf. FIG. 1).

Bei der in Fig. 3 dargestellten Ausführungsform ist der Austrittsbereich 4 des Eingusskörpers 3 mit einem Ringkanal 11 ausgestattet, durch welchen Inertgas in den Spalt zwischen den Bestandteilen 2 und 4 geführt wird. Der Ringkanal 11 steht über eine Zuführleitung 12 mit einer nicht dargestellten Inertgasquelle in Verbindung.In the embodiment shown in FIG. 3, the outlet area 4 of the casting body 3 is equipped with an annular channel 11, through which inert gas is guided into the gap between the components 2 and 4. The ring channel 11 is connected via a feed line 12 to an inert gas source, not shown.

Der Druck des Inertgases ist dabei so bemessen, dass er ständig geringfügig unter dem Wert des metallostatischen Druckes in der Schmelze im Bereich der Austrittskante 4" des Austrittsbereiches 4 liegt. Das vorhandene Inertgas verhindert das zu weite Eindringen von Schmelze in den Spalt zwischen den Bestandteilen 2 und 4, ohne dass die Gefahr des Einlagerns von Inertgas in den Giessstrang besteht.The pressure of the inert gas is dimensioned such that it is constantly slightly below the value of the metallostatic pressure in the melt in the area of the exit edge 4 "of the exit area 4. The inert gas present prevents the melt from penetrating too far into the gap between the components 2 and 4, without the risk of storing inert gas in the casting line.

Auf der von der Austrittskante 4" abgewandten rückwärtigen Seite ist der Ringkanal 11 durch eine gleichzeitig an den Kokillenwänden 2 anliegende Dichtung 13 verschlossen.On the rear side facing away from the trailing edge 4 ″, the ring channel 11 is closed by a seal 13 which is in contact with the mold walls 2 at the same time.

Der Erfindungsgegenstand ist nicht auf die Verwendung im Zusammenhang mit bandförmigen Kokillenwänden beschränkt; er kann auch mit andersartig aufgebauten Kokillenwänden zusammenwirken.The subject matter of the invention is not limited to use in connection with belt-shaped mold walls; it can also interact with mold walls of a different design.

Claims (16)

1. A metal inlet of a continuous casting apparatus, comprising a stationary fire resistant pouring body (3) partially surrounded by a mould having walls (2) movable in the casting direction, whereby a gap (9) is provided between the facing surfaces of the mould walls and the pouring body at least at the outlet portion (4) of the latter, characterised in that the mould walls (2) have a thermally insulating layer, the gap (9) amounts to more than 0,3 mm to 2 mm and the speed of the mould walls is such that a zone (8') filled with liquid metal is present in the gap between the solidification range (8) formed from the mould walls (2) and the pouring body (3).
2. Apparatus according to claim 1, characterised in that the gap (9) amounts to at least 1,5 mm.
3. Apparatus according to claim 1, characterised in that the gap (9) amounts to at least 1 mm.
4. Apparatus according to one of claims 1 to 3, characterised in that the gap (9) is set to a value between 0,5 and 1 mm and the speed of the mould walls (2) is between 10 and 20 m/min.
5. Apparatus according to one of claims 1 to 4, characterised in that the gap (9) between the mould walls (2) and the pouring body (3) is formed by guide rails (10) disposed between them which are supported under small pre-tension against the mould walls.
6. Apparatus according to one of claims 1 to 5, characterised in that the maximum spacing of the guide rails (10) from one another, seen transversely to the length of the casting body (3), is 200 mm.
7. Apparatus according to one of claims 1 to 6, characterised in that the width of the guide rails (10) transversely to the length of the pouring body (3) is at most 5 mm.
8. Apparatus according to one of claims 1 to 7, characterised in that the guide rails (10) extend to at least up to 30 mm from the outlet edge (4") of the pouring body (3), seen in the longitudinal direction of the latter.
9. Apparatus according to one of claims 1 to 8, characterised in that the guide rails (10) extend at least up to 50 mm from the outlet edge (4") of the pouring body (3), seen in the longitudinal direction of the latter.
10. Apparatus according to one of claims 1 to 9, characterised in that the guide rails (10) are movably mounted in the pouring body (3).
11. Apparatus according to one of claims 1 to 10, characterised in that the guide rails (10) consist of the material of the pouring body (3).
12. Apparatus according to one of claims 1 to 11, characterised in that the outlet portion (4) of the pouring body (3) has a funnel shaped bore (7) which diverges in the casting direction (arrow 6).
13. Apparatus according to one of claims 1 to 12, characterised in that the outlet portion (4) and the remainder (5) of the pouring body (3) are so connected as to allow different thermally induced changes of dimensions.
14. Apparatus according to one of claims 1 to 13, characterised in that the gap (9) contains in the region of the outlet (4) of the pouring body (3) inert gas at a pressure slightly lower than the metallostatic pressure of the melt in the outlet region (4).
15. Apparatus according to claim 14, characterised in that the pouring body (3) has in its outer surface facing the mould walls (2) an annular channel (11) which is connected outside the mould to a source of inert gas which is sealed in relation to the mould walls at the side remote from the outlet region (4).
16. Apparatus according to one of claims 1 to 15, characterised in that the outlet portion (4) of the pouring body (3), in contrast to the remainder (5) thereof, consists of a material of high thermal conductivity.
EP81104544A 1980-08-01 1981-06-12 Means for introducing molten metal into a continuous-casting mould having travelling walls Expired EP0045365B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81104544T ATE6215T1 (en) 1980-08-01 1981-06-12 METAL INLET IN CONTINUOUS CASTING DEVICES WITH MOVING MOLD WALLS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3029223 1980-08-01
DE3029223A DE3029223C2 (en) 1980-08-01 1980-08-01 Inlet for the molten metal in continuous casting devices

Publications (2)

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EP0045365A1 EP0045365A1 (en) 1982-02-10
EP0045365B1 true EP0045365B1 (en) 1984-02-15

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EP (1) EP0045365B1 (en)
JP (1) JPS5752549A (en)
AT (1) ATE6215T1 (en)
BR (1) BR8104956A (en)
CA (1) CA1182617A (en)
DD (1) DD201650A5 (en)
DE (2) DE3029223C2 (en)
ES (1) ES8205366A1 (en)
ZA (1) ZA815269B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3325716C2 (en) * 1983-07-16 1985-08-14 Fried. Krupp Gmbh, 4300 Essen Casting nozzle mouthpiece for continuous casting molds processing steel melt with mold walls moving in the casting direction
DE3345982C2 (en) * 1983-12-20 1985-11-14 Fried. Krupp Gmbh, 4300 Essen Inlet for the molten metal in continuous casting devices that have a fixed, refractory casting nozzle and a mold with mold walls that are only moved in the direction of casting
DE3401024C2 (en) * 1984-01-13 1986-01-16 Fried. Krupp Gmbh, 4300 Essen Casting nozzle consisting of several longitudinal sections for feeding molten metal into a continuous casting mold and method for producing the mouthpiece of such a casting nozzle
DE3403152C2 (en) * 1984-01-31 1986-02-20 Fried. Krupp Gmbh, 4300 Essen Method for feeding molten steel from an intermediate container into a double-band continuous casting mold and intermediate container for carrying out the method
ATE43264T1 (en) * 1986-03-10 1989-06-15 Larex Ag SEALING OF A CASTING NOZZLE AGAINST THE CASTING SPACE OF A CONTINUOUS CASTING DEVICE WITH AT LEAST ONE ROUNDING, FLEXIBLE MOLD STRIP.
CA2517447C (en) * 1994-07-19 2007-05-29 Alcan International Limited Process and apparatus for casting metal strip and injector used therefor
AT405254B (en) * 1996-02-20 1999-06-25 Hulek Anton TRACKED CHILLER FOR A CONTINUOUS CASTING SYSTEM

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1094517A (en) * 1953-11-25 1955-05-20 Casting plant for molten metals
US3598173A (en) * 1968-10-17 1971-08-10 Olin Mathieson Continuous casting machine having a variable mold length and adapted for casting in a variety of sizes at high speed
CH508433A (en) * 1970-06-24 1971-06-15 Prolizenz Ag C O Schweiz Kredi Nozzle for feeding the molten metal into the caterpillar mold during strip casting
FR2121418A1 (en) * 1971-01-12 1972-08-25 Technicon Instr Horizontal continuous casting
CH618366A5 (en) * 1977-05-05 1980-07-31 Prolizenz Ag

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CA1182617A (en) 1985-02-19
ZA815269B (en) 1982-10-27
JPS5752549A (en) 1982-03-29
DE3029223A1 (en) 1982-11-04
ES503761A0 (en) 1982-06-01
EP0045365A1 (en) 1982-02-10
ATE6215T1 (en) 1984-03-15
DE3162265D1 (en) 1984-03-22
ES8205366A1 (en) 1982-06-01
DD201650A5 (en) 1983-08-03
BR8104956A (en) 1982-04-20
DE3029223C2 (en) 1984-09-27

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