EP0071802A2 - Process and device to close the gap between devices moving relatively with respect to one another - Google Patents

Process and device to close the gap between devices moving relatively with respect to one another Download PDF

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Publication number
EP0071802A2
EP0071802A2 EP82106412A EP82106412A EP0071802A2 EP 0071802 A2 EP0071802 A2 EP 0071802A2 EP 82106412 A EP82106412 A EP 82106412A EP 82106412 A EP82106412 A EP 82106412A EP 0071802 A2 EP0071802 A2 EP 0071802A2
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Prior art keywords
gap
pressure
liquid
currents
electromagnetic forces
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EP82106412A
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German (de)
French (fr)
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EP0071802A3 (en
Inventor
Franz Rudolf Dr. Block
Jürgen Dr. Pötschke
Dieter Figge
Gerd Artz
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Fried Krupp AG
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Fried Krupp 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
    • B22D11/0637—Accessories therefor
    • B22D11/064—Accessories therefor for supplying molten metal
    • B22D11/0645—Sealing means for the nozzle between the travelling surfaces

Definitions

  • the invention relates to a method and a device for sealing the gap between relatively moving devices of a system for pouring liquid metals, the gap being created, for example, by the transition from a casting vessel to a casting and rolling system and preventing melt from flowing out through the gap and is lost for the strand formation.
  • the invention has for its object to provide a method for sealing the gap between relatively moving devices of a system for pouring liquid metals, with which it is possible to stabilize vertically extending interfaces between liquids and gases.
  • the invention proposes to proceed in such a way that a part of the liquid pressure which does not exceed the minimum liquid pressure at the gap cross section is compensated pneumatically, while the variable rest of the liquid pressure is absorbed by electromagnetic forces which result from the interaction of a magnetic induction with currents result in the liquid.
  • the method according to the invention allows pressure differences in the liquid to be compensated for by the electromagnetic forces additionally used.
  • the electromagnetic forces used according to the invention can easily be adapted to the local requirements, the inherent one Disadvantage of not being sufficiently strong, as a rule, is eliminated by the pneumatic pressure additionally applied according to the invention.
  • the electromagnetic forces are only used to compensate for the pressure components above a minimum value, while the minimum pressure is compensated pneumatically.
  • the walls delimiting the gap can be given a shape which creates a circumferential, endless gap in which the liquid forms a closed conductor in which currents are induced.
  • Walls delimiting the gap can also have a shape hold, which creates a gap of finite length, current being supplied at the ends of the gap via electrodes.
  • the gas pressure is regulated just below the minimum liquid pressure along the gap, for which purpose the pressure is determined by measuring the fill level in the inlet or by changes in the power loss of an inductor.
  • the primary magnetic induction can be generated by a coil, the distance between which is selected at the gap to be sealed such that the magnetic induction changes to the same extent as the pressure of the liquid along the gap.
  • An embodiment of the device according to the invention provides that porous stones are used as internals.
  • an embodiment of the device according to the invention provides that the spreading of large currents in conductors adjacent to the inductors is prevented by mutually insulated sections.
  • the sealing takes place along a rectangular gap. Its edges are formed by a refractory infeed 13 advanced over a refractory infeed 2 of a storage vessel 1, the steel strips 5 rotating over support rollers and brass blocks 9 on the side.
  • the liquid metal forms a closed rectangular conductor 14 in front of the gap.
  • a rectangular, current-carrying coil is arranged in front of the gap and is supplied with alternating current.
  • the time-varying magnetic fields induce currents in the liquid rectangular conductor 14.
  • the conductor loops formed by the coil 6 and the rectangular conductor 14 repel each other.
  • the coil is brought closer to the gap there, as shown in FIG. 3.
  • the main compensation of the ferrostatic pressure is pneumatic.
  • a suitable gas pressure is maintained via a gas supply line 3.
  • the gas pressure is readjusted in accordance with the level in the storage vessel 1, so that only a small constant part of the ferrostatic pressure has to be compensated electromagnetically at the upper edge.
  • the fill level is monitored with a measuring device, not shown.
  • the mean pressure can also be measured via changes in the power loss of the primary coil.
  • Inert gases are preferably considered as gases, but air is also suitable in many cases if it is only ensured that the gas flow near the surface of the liquid is as small as possible.
  • the pressure chamber is sealed externally using conventional technology. It is chosen according to the existing thermal and mechanical conditions. It will often be possible to move the seal to less hot areas or to cool it yourself.
  • the materials are selected or adapted to the special conditions.
  • Electrically highly conductive materials are cut and the section surfaces insulated from each other, e.g. B. by intermediate layers, oxide layers or plasma spraying, so that no undesirable large-scale currents can form.
  • Which frequency is expediently used in the primary coil depends on the conductivity of the liquid and also depends on how quickly the force density should drop from the surface to the inside of the liquid.
  • the penetration depth ⁇ of the electromagnetic fields in a conductor can be determined using the formula estimate.
  • the invention is of course not limited to the examples given here. Rather, it allows you to pay rich casting techniques, as they are described in the literature for low-melting metals, especially for aluminum - see German Offenlegungsschrift 28 30 284 and the processes mentioned there - can now also be used with higher-melting metals.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

When casting liquid metals, the task arises with modern methods of sealing the gap between stationary and moving systems in order that no melt flows out via the gap. In melts at high temperatures and having the tendency to form alloys, there is a lack of materials with the aid of which the slots can be permanently sealed. Through the combined use of pneumatic and electromagnetic forces, a gap can be sealed in a particularly advantageous way when the electromagnetic forces are employed for the purpose of homogenising the liquid pressure, i.e. of lowering the surface pressure to a constant value. The lowered pressure can be compensated pneumatically. In accordance with the process according to the invention, a proportion of the liquid pressure that does not exceed the minimum liquid pressure on the gap cross-section is compensated pneumatically (3), and the remainder of the liquid pressure is compensated by electromagnetic forces (6, 14). The electromagnetic forces result from the interaction of a magnetic induction (6) with currents in the liquid (14). <IMAGE>

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Abdichten des Spaltes zwischen relativ zueinander bewegten Einrichtungen einer Anlage zum Vergießen flüssiger Metalle, wobei der Spalt beispielsweise durch den übergang von einem Gießgefäß zu einer Gießwalzanlage entsteht und verhindert werden muß, daß Schmelze durch den Spalt ausfließt und für die Strangbildung verloren geht.The invention relates to a method and a device for sealing the gap between relatively moving devices of a system for pouring liquid metals, the gap being created, for example, by the transition from a casting vessel to a casting and rolling system and preventing melt from flowing out through the gap and is lost for the strand formation.

Bei Schmelzen mit hohen Temperaturen und der Neigung, Legierungen zu bilden, fehlt es an Materialien, mit deren Hilfe ein derartiger Spalt dauerhaft abgedichtet werden kann.In the case of melts with high temperatures and the tendency to form alloys, there is a lack of materials with which such a gap can be permanently sealed.

Mit Hilfe von magnetischen Feldern und Strömen im fließenden Metall lassen sich Kräfte auf das Metall ausüben, die jedoch in der Regel nicht ausreichen, den aus der Höhe des Flüssigkeitsspiegels der Schmelze resultierenden, im Spaltbereich auftretenden Druck zu kompensieren. Auch ist eine pneumatische Kompensation mit ruhenden Gasen nicht möglich, da diese - bis auf vernachlässigbar kleine Druckänderungen durch das Eigengewicht - in technischen Anlagen überall denselben Druck aufweisen, während selbst bei ruhenden Flüssigkeiten durch das Eigengewicht der flüssigen Säule über die Höhe der technischen Anlagen erhebliche Druckunterschiede auftreten können, so daß es unmöglich ist, über größere Höhen pneumatisch einen Kräfteausgleich aufrechtzuerhalten.With the help of magnetic fields and currents in the flowing metal, forces can be exerted on the metal which, however, are generally not sufficient to compensate for the pressure occurring in the gap area, which results from the level of the liquid in the melt. Pneumatic compensation with stationary gases is also not possible, because - with the exception of negligibly small changes in pressure due to their own weight - they have the same pressure everywhere in technical systems, while even with stationary liquids, due to the own weight of the liquid column, the level of the technical column Plants considerable pressure differences can occur, so that it is impossible to maintain a force balance pneumatically over greater heights.

Da nur an einer horizontalen Grenzfläche überall derselbe Druck herrscht, ist es nicht möglich, die Grenzfläche in einem vertikalen Spalt durch Gasdruck abzudichten: Entweder wird im unteren Bereich des Spaltes Flüssigkeit ausfließen, oder es wird sich im oberen Teil Gas durchdrücken.Since the same pressure prevails everywhere only at a horizontal interface, it is not possible to seal the interface in a vertical gap with gas pressure: either liquid will flow out in the lower area of the gap or gas will push through in the upper part.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Abdichten des Spaltes zwischen relativ zueinander bewegten Einrichtungen einer Anlage zum Vergießen flüssiger Metalle vorzuschlagen, mit dem es möglich ist, sich in vertikaler Richtung erstreckende Grenzflächen zwischen Flüssigkeiten und Gasen zu stabilisieren.The invention has for its object to provide a method for sealing the gap between relatively moving devices of a system for pouring liquid metals, with which it is possible to stabilize vertically extending interfaces between liquids and gases.

Zur Lösung der gestellten Aufgabe wird erfindungsgemäß vorgeschlagen, so zu verfahren, daß ein den minimalen Flüssigkeitsdruck am Spaltquerschnitt nicht überschreitender Teil des Flüssigkeitsdruckes pneumatisch kompensiert wird, während der variable Rest des Flüssigkeitsdruckes durch elektromagnetische Kräfte aufgefangen wird, die aus der Wechselwirkung einer magnetischen Induktion mit Strömen in der Flüssigkeit resultieren.To achieve the object, the invention proposes to proceed in such a way that a part of the liquid pressure which does not exceed the minimum liquid pressure at the gap cross section is compensated pneumatically, while the variable rest of the liquid pressure is absorbed by electromagnetic forces which result from the interaction of a magnetic induction with currents result in the liquid.

Durch das erfindungsgemäße Verfahren lassen sich Druckunterschiede in der Flüssigkeit durch die zusätzlich zur Anwendung kommenden elektromagnetischen Kräfte ausgleichen. Die erfindungsgemäß benutzten elektromagnetischen Kräfte lassen sich, im Gegensatz zum Gasdruck - der bis auf das meist vernachlässigbare Eigengewicht der Gassäule überall gleich ist - leicht den lokalen Erfordernissen anpassen, wobei der ihnen anhaftende Nachteil, in der Regel allein nicht ausreichend stark zu sein, durch den erfindungsgemäß zusätzlich aufgebrachten pneumatischen Druck behoben ist. Die elektromagnetischen Kräfte werden nämlich nur dazu verwendet, die über einem Minimalwert liegenden Druckanteile zu kompensieren, während der minimale Druck pneumatisch kompensiert wird.The method according to the invention allows pressure differences in the liquid to be compensated for by the electromagnetic forces additionally used. In contrast to the gas pressure - which is the same everywhere except for the mostly negligible weight of the gas column - the electromagnetic forces used according to the invention can easily be adapted to the local requirements, the inherent one Disadvantage of not being sufficiently strong, as a rule, is eliminated by the pneumatic pressure additionally applied according to the invention. The electromagnetic forces are only used to compensate for the pressure components above a minimum value, while the minimum pressure is compensated pneumatically.

Die Kraftdichte aus den elektromagnetischen Kräften kann auf verschiedene, an sich bekannte Arten variiert werden:

  • a) können die Ströme in der Flüssigkeit verändert werden;
  • b) können die Felder der magnetischen Induktion verändert werden und
  • c) können beide Maßnahmen gleichzeitig durchgeführt werden.
The force density from the electromagnetic forces can be varied in various ways known per se:
  • a) the currents in the liquid can be changed;
  • b) the fields of magnetic induction can be changed and
  • c) both measures can be carried out simultaneously.

Besonders einfache Lösungen können sich dadurch ergeben, daß den felderzeugenden, stromdurchflossenen Leitern geeignete Formen gegeben werden, d. h. zum Beispiel, daß sie in den unteren Bereichen, in denen ein höherer Flüssigkeitsdruck herrscht, näher an die Grenzfläche herangebracht werden.Particularly simple solutions can result from the fact that the field-generating, current-carrying conductors are given suitable shapes, i. H. for example, that they are brought closer to the interface in the lower areas where there is a higher fluid pressure.

Nach einer Ausgestaltung des erfindungsgemäßen Verfahrens können den Spalt begrenzende Wandungen eine Form erhalten, die einen umlaufenden endlosen Spalt entstehen läßt, in dem die Flüssigkeit einen geschlossenen Leiter bildet, worin Ströme induziert werden. Den Spalt begrenzende Wandungen können aber auch eine Form erhalten, die einen Spalt mit endlicher Länge entstehen läßt, wobei an den Enden des Spaltes über Elektroden Strom zugeführt wird.According to an embodiment of the method according to the invention, the walls delimiting the gap can be given a shape which creates a circumferential, endless gap in which the liquid forms a closed conductor in which currents are induced. Walls delimiting the gap can also have a shape hold, which creates a gap of finite length, current being supplied at the ends of the gap via electrodes.

Nach einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird der Gasdruck jeweils knapp unter dem minimalen Flüssigkeitsdruck längs des Spaltes eingeregelt, wozu der Druck durch eine Füllstandsmessung im Einlauf oder aus Änderungen der Verlustleistung eines Induktors bestimmt wird.According to a further embodiment of the method according to the invention, the gas pressure is regulated just below the minimum liquid pressure along the gap, for which purpose the pressure is determined by measuring the fill level in the inlet or by changes in the power loss of an inductor.

Die primärmagnetische Induktion kann erfindungsgemäß durch eine Spule erzeugt werden, deren Abstand am abzudichtenden Spalt so gewählt wird, daß die magnetische Induktion sich im gleichen Maße ändert wie der Druck der Flüssigkeit längs des Spaltes.According to the invention, the primary magnetic induction can be generated by a coil, the distance between which is selected at the gap to be sealed such that the magnetic induction changes to the same extent as the pressure of the liquid along the gap.

Bei einer Vorrichtung zur Durchführung des Verfahrens wird erfindungsgemäß vorgeschlagen, daß zwischen nach außen hin abgedichteten Druckkammern, in die das Gas gedrückt wird, und der Umgebung des Spaltes Einbauten vorgesehen sind, die einen Druckausgleich ermöglichen, die Ausbildung konvektiver Ströme aber behindern.In a device for carrying out the method, it is proposed according to the invention that internals are provided between pressure chambers sealed into the outside, into which the gas is pressed, and the vicinity of the gap, which allow pressure equalization, but hinder the formation of convective currents.

Eine Ausgestaltung der erfindungsgemäßen Vorrichtung sieht vor, daß als Einbauten poröse Steine verwendet werden.An embodiment of the device according to the invention provides that porous stones are used as internals.

Schließlich sieht eine Ausgestaltung der erfindungsgemäßen Vorrichtung noch vor, daß durch gegeneinander isolierte Abschnitte die Ausbreitung großräumiger Ströme in zu den Induktoren benachbarten Leitern verhindert wird.Finally, an embodiment of the device according to the invention provides that the spreading of large currents in conductors adjacent to the inductors is prevented by mutually insulated sections.

In der Zeichnung ist schematisch ein Ausführungsbeispiel einer Vorrichtung zum Abdichten des Spaltes beim Walzgießen dargestellt. Es zeigen:

  • Fig. 1 den vertikalen Querschnitt einer Gießwalzanlage im abzudichtenden Bereich;
  • Fig. 2 einen Schnitt nach der Linie II - II der Fig. 1 und
  • Fig. 3 einen Ausschnitt des vertikalen Querschnitts.
In the drawing, an embodiment of a device for sealing the gap during roll casting is shown schematically. Show it:
  • 1 shows the vertical cross section of a casting and rolling system in the area to be sealed;
  • Fig. 2 shows a section along the line II - II of Fig. 1 and
  • Fig. 3 shows a section of the vertical cross section.

Wie insbesondere Fig. 2 erkennen läßt, erfolgt die Abdichtung längs eines rechteckigen Spaltes. Seine Ränder werden von einer über eine feuerfeste Zustellung 2 eines Vorratsgefäßes 1 vorgezogene feuerfeste Zustellung 13, den über Stützrollen umlaufenden Stahlbändern 5 und seitlichen Messingklötzen 9 gebildet.As can be seen in particular in FIG. 2, the sealing takes place along a rectangular gap. Its edges are formed by a refractory infeed 13 advanced over a refractory infeed 2 of a storage vessel 1, the steel strips 5 rotating over support rollers and brass blocks 9 on the side.

Dadurch, daß die feuerfeste Zustellung 13 hinreichend weit zwischen die Stahlbänder 5 vorgezogen wurde, bildet das flüssige Metall in dem Spalt einen geschlossenen Rechteckleiter 14. Vor dem Spalt ist eine rechteckige, stromdurchflossene Spule angeordnet, die mit Wechselstrom beaufschlagt wird. Die zeitlich veränderlichen magnetischen Felder induzieren in den flüssigen Rechteckleiter 14 Ströme. Die durch die Spule 6 und den Rechteckleiter 14 gebildeten Leiterschleifen stoßen sich ab.Because the refractory lining 13 has been advanced far enough between the steel strips 5, the liquid metal forms a closed rectangular conductor 14 in front of the gap. A rectangular, current-carrying coil is arranged in front of the gap and is supplied with alternating current. The time-varying magnetic fields induce currents in the liquid rectangular conductor 14. The conductor loops formed by the coil 6 and the rectangular conductor 14 repel each other.

Damit im unteren Bereich die abstoßende Kraft entsprechend dem höheren Druck größer ist, wird dort die Spule, wie Fig. 3 zeigt, näher vor den Spalt gebracht. Die wesentliche Kompensation des ferrostatischen Druckes erfolgt pneumatisch. über eine Gaszufuhrleitung 3 wird ein geeigneter Gasdruck aufrechterhalten. Der Gasdruck wird entsprechend dem Füllstand im Vorratsgefäß 1 nachgeregelt, so daß am oberen Rand nur noch ein kleiner konstanter Teil des ferrostatischen Druckes elektromagnetisch kompensiert werden muß. Der Füllstand wird hierzu mit einer nicht dargestellten Meßeinrichtung überwacht. Erfindungsgemäß kann der mittlere Druck auch über Änderungen der Verlustleistung der Primärspule gemessen werden.So that the repulsive force corresponding to the higher pressure is greater in the lower region, the coil is brought closer to the gap there, as shown in FIG. 3. The main compensation of the ferrostatic pressure is pneumatic. A suitable gas pressure is maintained via a gas supply line 3. The gas pressure is readjusted in accordance with the level in the storage vessel 1, so that only a small constant part of the ferrostatic pressure has to be compensated electromagnetically at the upper edge. For this purpose, the fill level is monitored with a measuring device, not shown. According to the invention, the mean pressure can also be measured via changes in the power loss of the primary coil.

Als Gase kommen vorzugsweise Inertgase in Betracht, aber auch Luft ist in vielen Fällen geignet, wenn nur dafür gesorgt wird, daß nahe der Oberfläche der Flüssigkeit die Gasströmung möglichst klein ist.Inert gases are preferably considered as gases, but air is also suitable in many cases if it is only ensured that the gas flow near the surface of the liquid is as small as possible.

Die äußere Abdichtung der Druckkammer erfolgt in konventioneller Technik. Sie wird entsprechend den vorliegenden thermischen und mechanischen Bedingungen gewählt. Oft wird es möglich sein, die Dichtung in weniger heiße Bereiche zu verlegen oder selbst zu kühlen.The pressure chamber is sealed externally using conventional technology. It is chosen according to the existing thermal and mechanical conditions. It will often be possible to move the seal to less hot areas or to cool it yourself.

In der Nähe der felderzeugenden Spulen werden die Materialien erfindungsgemäß im Hinblick auf die speziellen Bedingungen gewählt oder diesen angepaßt.According to the invention, in the vicinity of the field-generating coils, the materials are selected or adapted to the special conditions.

Elektrisch gut leitende Materialien werden zerschnitten und die Abschnittflächen gegeneinander isoliert, z. B. durch Zwischenlagen, Oxidschichten oder Plasmaspritzen, so daß sich keine unerwünschten großräumigen Ströme ausbilden können.Electrically highly conductive materials are cut and the section surfaces insulated from each other, e.g. B. by intermediate layers, oxide layers or plasma spraying, so that no undesirable large-scale currents can form.

Auch Werkstoffe mit hoher magnetischer Permeabilität sind nur so zu verwenden, daß sie die Ausbildung der gewünschten Felder begünstigen.Even materials with high magnetic permeability can only be used in such a way that they favor the formation of the desired fields.

Welche Frequenz in der Primärspule zweckmäßig verwendet wird, hängt von der Leitfähigkeit der Flüssigkeit ab und richtet sich auch danach, wie schnell die Kraftdichte von der Oberfläche zum Inneren der Flüssigkeit hin abfallen soll.Which frequency is expediently used in the primary coil depends on the conductivity of the liquid and also depends on how quickly the force density should drop from the surface to the inside of the liquid.

Die Eindringtiefe δ der elektromagnetischen Felder in einem Leiter läßt sich mit der Formel

Figure imgb0001
abschätzen.The penetration depth δ of the electromagnetic fields in a conductor can be determined using the formula
Figure imgb0001
 estimate.

Hierbei sindµ= 0,4 π 10-6 Vs/Am die magnetische Permeabilität und σ die Leitfähigkeit des flüssigen Metalles. Da die Kraftdichte F bilinear in der magnetischen Induktion B und in der Stromdichte S ist

Figure imgb0002
beträgt ihre Eindringtiefe nur die Hälfte derjenigen der elektromagnetischen Felder. Für flüssigen Stahl mit K = 0,7 MS/m und δ = 20 mm oder δ 2 = 10 mm ergibt sich z. B. die Frequenz f zu:
Figure imgb0003
 Here µ = 0.4 π 10 -6 Vs / Am the magnetic permeability and σ the conductivity of the liquid metal. Because the force density F bilinear in magnetic induction B and in current density S is
Figure imgb0002
 their penetration depth is only half that of the electromagnetic fields. For liquid steel with K = 0.7 MS / m and δ = 20 mm or δ 2 = 10 mm there is z. B. the frequency f to:
Figure imgb0003

Die Erfindung beschränkt sich natürlich nicht nur auf die hier gegebenen Beispiele. Sie erlaubt es vielmehr, zahlreiche Gießtechniken, wie sie in der Literatur für niedrigschmelzende Metalle, insbesondere für Aluminium, beschrieben werden - siehe die Deutsche Offenlegungschrift 28 30 284 und die dort genannten Verfahren - nunmehr auch bei höherschmelzenden Metallen zu verwenden.The invention is of course not limited to the examples given here. Rather, it allows you to pay rich casting techniques, as they are described in the literature for low-melting metals, especially for aluminum - see German Offenlegungsschrift 28 30 284 and the processes mentioned there - can now also be used with higher-melting metals.

Claims (8)

1. Verfahren zum Abdichten des Spaltes zwischen relativ zueinander bewegten Einrichtungen einer Anlage zum Vergießen flüssiger Metalle, dadurch gekennzeichnet, daß ein den minimalen Flüssigkeitsdruck am Spaltquerschnitt nicht überschreitender Teil des Flüssigkeitsdruckes pneumatisch kompensiert wird, während der variable Rest des Flüssigkeitsdruckes durch elektromagnetische Kräfte aufgefangen wird, die aus der Wechselwirkung einer magnetischen Induktion mit Strömen in der Flüssigkeit resultieren.1. A method for sealing the gap between relatively moving devices of a plant for pouring liquid metals, characterized in that a part of the liquid pressure not exceeding the minimum liquid pressure at the gap cross-section is compensated pneumatically, while the variable remainder of the liquid pressure is absorbed by electromagnetic forces, resulting from the interaction of magnetic induction with currents in the liquid. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß den Spalt begrenzende Wandungen eine Form erhalten, die einen umlaufenden endlosen Spalt entstehen läßt, in dem die Flüssigkeit einen geschlossenen Leiter bildet, worin Ströme induziert werden.2. The method according to claim 1, characterized in that the gap delimiting walls receive a shape which allows a circumferential endless gap to arise, in which the liquid forms a closed conductor, in which currents are induced. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß den Spalt begrenzende Wandungen eine Form erhalten, die einen Spalt mit endlicher Länge entstehen läßt, und daß an den Enden des Spaltes über Elektroden Strom zugeführt wird.3. The method according to claim 1, characterized in that the gap delimiting walls receive a shape that allows a gap with finite length to arise, and that current is supplied to the ends of the gap via electrodes. 4. Verfahren nach den Ansprüchen 1 und 2 oder 3, dadurch gekennzeichnet, daß der Gasdruck jeweils knapp unter dem minimalen Flüssigkeitsdruck längs des Spaltes eingeregelt wird, wozu der Druck durch eine Füllstandsmessung im Einlauf oder aus Änderungen der Verlustleistung eines Induktors bestimmt wird.4. The method according to claims 1 and 2 or 3, characterized in that the gas pressure is adjusted just below the minimum liquid pressure along the gap, for which the pressure is determined by a level measurement in the inlet or from changes in the power loss of an inductor. 5. Vorrichtung nach einem oder mehreren der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die primäre magnetische Induktion durch eine Spule erzeugt wird, deren Abstand am abzudichtenden Spalt so gewählt wird, daß die magnetische Induktion sich im gleichen Maße ändert wie der Druck der Flüssigkeit längs des Spaltes.5. The device according to one or more of claims 1 to 4, characterized in that the primary magnetic induction is generated by a coil whose distance at the gap to be sealed is chosen so that the magnetic induction changes to the same extent as the pressure of the liquid along the gap. 6. Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß zwischen nach außen hin abgedichteten Druckkammern, in die das Gas gedrückt wird, und der Umgebung des Spaltes Einbauten vorgesehen sind, die einen Druckausgleich ermöglichen, die Ausbildung konvektiver Ströme aber behindern.6. Apparatus for performing the method according to claim 1, characterized in that internally sealed pressure chambers into which the gas is pressed, and the vicinity of the gap internals are provided which allow pressure equalization, but hinder the formation of convective currents. 7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß als Einbauten poröse Steine verwendet werden.7. The device according to claim 6, characterized in that porous stones are used as internals. 8. Vorrichtung nach den Ansprüchen 6 und 7, dadurch gekennzeichnet, daß durch gegeneinander isolierte Abschnitte die Ausbreitung großräumiger Ströme in zu den Induktoren benachbarten Leitern verhindert wird.8. Device according to claims 6 and 7, characterized in that the spread of large currents in adjacent conductors to the inductors is prevented by mutually insulated sections.
EP82106412A 1981-08-07 1982-07-16 Process and device to close the gap between devices moving relatively with respect to one another Withdrawn EP0071802A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813131353 DE3131353A1 (en) 1981-08-07 1981-08-07 "METHOD AND DEVICE FOR SEALING THE GAP BETWEEN RELATIVELY MOVING DEVICES"
DE3131353 1981-08-07

Publications (2)

Publication Number Publication Date
EP0071802A2 true EP0071802A2 (en) 1983-02-16
EP0071802A3 EP0071802A3 (en) 1983-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82106412A Withdrawn EP0071802A3 (en) 1981-08-07 1982-07-16 Process and device to close the gap between devices moving relatively with respect to one another

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EP (1) EP0071802A3 (en)
JP (1) JPS5865550A (en)
DE (1) DE3131353A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103715A1 (en) * 1982-08-23 1984-03-28 Fried. Krupp Gesellschaft mit beschränkter Haftung Sealing between a pouring nozzle and a surrounding continuous casting mould for steel with a rectangular pouring cross section
GB2140720A (en) * 1983-06-01 1984-12-05 Alusuisse Feeding molten metal through a nozzle to a casting mould
US4685505A (en) * 1986-01-06 1987-08-11 Aluminum Company Of America Non-contacting side edge dam means for roll casting
US4735254A (en) * 1985-06-27 1988-04-05 Kawasaki Steel Corporation Method and apparatus for casting endless strip
EP0290866A2 (en) * 1987-05-15 1988-11-17 Westinghouse Electric Corporation Improved discrete excitation coil producing seal at continuous casting machine pouring tube outlet nozzle/mold inlet interface
EP0490463A1 (en) * 1990-12-10 1992-06-17 Inland Steel Company Method and apparatus for rheocasting
EP0531286A1 (en) † 1988-11-17 1993-03-17 ARCH DEVELOPMENT CORPORATION, The University of Chicago Sidewall containment of liquid metal with horizontal alternating magnetic fields
WO2006123023A1 (en) * 2005-05-13 2006-11-23 Fai Production Method and plant for transformation of a liquid-state metal into a fragmented solid-state metal

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015314A (en) * 1963-11-13 1965-12-31 Davy & United Eng Co Ltd Continuous casting
DE2548939A1 (en) * 1974-11-01 1976-05-06 Erik Allan Olsson PROCESS FOR MANUFACTURING METALLIC STRIP MATERIAL BY CASTING
DE2548940A1 (en) * 1974-11-01 1976-05-13 Erik Allan Olsson PROCEDURE FOR SEALING GAP JOINTS
EP0043987A1 (en) * 1980-07-11 1982-01-20 Concast Holding Ag Apparatus for the continuous casting of metal in a closed gating system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015314A (en) * 1963-11-13 1965-12-31 Davy & United Eng Co Ltd Continuous casting
DE2548939A1 (en) * 1974-11-01 1976-05-06 Erik Allan Olsson PROCESS FOR MANUFACTURING METALLIC STRIP MATERIAL BY CASTING
DE2548940A1 (en) * 1974-11-01 1976-05-13 Erik Allan Olsson PROCEDURE FOR SEALING GAP JOINTS
EP0043987A1 (en) * 1980-07-11 1982-01-20 Concast Holding Ag Apparatus for the continuous casting of metal in a closed gating system

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0103715A1 (en) * 1982-08-23 1984-03-28 Fried. Krupp Gesellschaft mit beschränkter Haftung Sealing between a pouring nozzle and a surrounding continuous casting mould for steel with a rectangular pouring cross section
US4502526A (en) * 1982-08-23 1985-03-05 Fried. Krupp Gesellschaft mit beschr/a/ nkter Haftung Seal for a continuous steel caster
GB2140720A (en) * 1983-06-01 1984-12-05 Alusuisse Feeding molten metal through a nozzle to a casting mould
US4735254A (en) * 1985-06-27 1988-04-05 Kawasaki Steel Corporation Method and apparatus for casting endless strip
US4817702A (en) * 1985-06-27 1989-04-04 Kawasaki Steel Corporation Apparatus for casting endless strip
US4685505A (en) * 1986-01-06 1987-08-11 Aluminum Company Of America Non-contacting side edge dam means for roll casting
EP0290866A2 (en) * 1987-05-15 1988-11-17 Westinghouse Electric Corporation Improved discrete excitation coil producing seal at continuous casting machine pouring tube outlet nozzle/mold inlet interface
EP0290866A3 (en) * 1987-05-15 1989-07-19 Westinghouse Electric Corporation Improved discrete excitation coil producing seal at continuous casting machine pouring tube outlet nozzle/mold inlet interface
EP0531286A1 (en) † 1988-11-17 1993-03-17 ARCH DEVELOPMENT CORPORATION, The University of Chicago Sidewall containment of liquid metal with horizontal alternating magnetic fields
EP0531286B2 (en) † 1988-11-17 2002-11-06 ARCH DEVELOPMENT CORPORATION, The University of Chicago Sidewall containment of liquid metal with horizontal alternating magnetic fields
EP0490463A1 (en) * 1990-12-10 1992-06-17 Inland Steel Company Method and apparatus for rheocasting
WO2006123023A1 (en) * 2005-05-13 2006-11-23 Fai Production Method and plant for transformation of a liquid-state metal into a fragmented solid-state metal

Also Published As

Publication number Publication date
DE3131353A1 (en) 1983-02-24
EP0071802A3 (en) 1983-06-01
JPS5865550A (en) 1983-04-19

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