EP0221331A1 - Casting head for a liquid metal metering apparatus, and method for using it - Google Patents

Casting head for a liquid metal metering apparatus, and method for using it Download PDF

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Publication number
EP0221331A1
EP0221331A1 EP86113281A EP86113281A EP0221331A1 EP 0221331 A1 EP0221331 A1 EP 0221331A1 EP 86113281 A EP86113281 A EP 86113281A EP 86113281 A EP86113281 A EP 86113281A EP 0221331 A1 EP0221331 A1 EP 0221331A1
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EP
European Patent Office
Prior art keywords
liquid metal
outlet chamber
casting head
protective gas
level
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EP86113281A
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German (de)
French (fr)
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EP0221331B1 (en
Inventor
Bruno Berg
Theodor Dipl.-Ing. Lauhoff
Joachim Barzantny
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Interatom Internationale Atomreaktorbau GmbH
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Interatom Internationale Atomreaktorbau GmbH
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Priority to AT86113281T priority Critical patent/ATE41341T1/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
    • B22D39/00—Equipment for supplying molten metal in rations

Definitions

  • the present invention relates to a casting head for a liquid metal dosing device according to the preamble of claim 1 and a method for its use.
  • a casting head according to the preamble of claim 1 is already known from a brochure from Norsk Hydro Magnesiumgesellschaft mbH "Automatically pouring magnesium with NORMAGIC® dosing device".
  • this pouring head has a prechamber with a kind of check valve with a ball as a closing element, and is controlled pneumatically.
  • EP-A-0 095 620 it is also known to mount a fill level sensor at the end of a feed pipe of a liquid metal conveying device and thus to keep the liquid metal fill level at a certain level in the feed pipe during breaks in delivery.
  • the object of the present invention is a casting head which enables particularly precise dosing of liquid metal, in particular aggressive liquid metal such as magnesium, and a method for its use.
  • a level measuring device preferably an inductive level meter
  • a level measuring device should be arranged in the prechamber of the casting head.
  • the attachment of a level measuring device inside the prechamber, d. H. in the area flooded by the liquid metal, has decisive advantages in the measuring accuracy compared to arrangements in which the liquid metal sensor is arranged outside the feed pipe.
  • the level sensor does not hinder the installation of trace heating outside the pouring head.
  • the liquid metal level can be adjusted to a precisely defined height in the prechamber during conveying breaks, which is necessary for precise dosing.
  • a throttle point is present in the overflow section or the outlet chamber of the casting head. While without the presence of a throttling point any deposit in the area of the conveyor pipe would lead to a significant reduction in the delivery rate, a defined throttling point means that even with deposits in the area of the conveyor system an almost constant delivery rate is still achieved during the delivery times. This enables dosing by means of purely time control with sufficient precision.
  • the throttle point the cross section of the conveyor by about a factor of 3 to 10. should preferably reduce about 5. This dimensioning of the throttling points has proven to be favorable for a constant delivery rate over longer operating periods.
  • the outlet chamber of the casting head should have a closure slide at its end.
  • This slide valve is not primarily used to interrupt the liquid metal flow, since this is done by regulating the feed pump.
  • the closure slide prevents dripping on the one hand and on the other hand excessive oxidation in the interior of the casting head, in particular in connection with a protective gas supply device, as will be explained in more detail with reference to the drawing.
  • the outlet chamber of the casting head should be connected to a protective gas supply device which enables controlled, intermittent supply of protective gas, preferably argon.
  • a protective gas supply device which enables controlled, intermittent supply of protective gas, preferably argon.
  • a corresponding method for metering liquid metal by means of a feed pump using a casting head according to the invention is described in claim 6.
  • the pump power is increased by a predeterminable amount and for a predefinable time.
  • the pump power is suddenly reduced again and at the same time a surge of protective gas is fed through the protective gas feed into the outlet chamber of the casting head.
  • the outlet chamber is closed by a slide or the like during the pauses in delivery, a small flow of shielding gas to compensate for losses due to leaks also being supplied.
  • the drawing shows a schematic representation of a metering system for liquid metal with its associated control devices.
  • the casting head 1 which can be filled with liquid metal by a liquid metal feed pump 2 via a feed pipe 3, is particularly emphasized in scale.
  • the liquid metal comes from a conventional melt container or the like, not shown here.
  • the casting head 1 has a prechamber 4, an overflow section 7 and an outlet chamber 8.
  • a fill level measuring arrangement 5 is arranged in the antechamber 4, and preferably an inductive fill level meter, which can be inserted from below into a corresponding sack tube. By means of this fill level meter 5, the liquid metal level 6 in the antechamber 4 can be measured precisely and precisely adjusted to a specific target value in the delivery pauses.
  • the overflow portion 7 or, as shown here, the outlet chamber S has a throttle point 9, g a defined conveying cross-section for the metal diessi forms. Furthermore, the outlet chamber 8, preferably behind the throttle point 9, has a protective gas feed 10 through which protective gas can be supplied. A slide valve 11 at the lower end 12 of the outlet chamber 8 enables the outlet chamber to be closed during breaks in delivery. A controllable valve 13 enables protective gas to be supplied in gushes from a storage container 14. Central control electronics 16 control the entire metering process. For this purpose, the electronics are first subjected to the level values measured in a level measuring electronics 15 in the prechamber 4.
  • the control electronics 16 determines the delivery rate of the delivery pump 2 during the delivery breaks, so that a precise fill level 6 can be maintained.
  • the control circuit 16 increases the delivery rate for a certain time by a certain amount, so that the desired amount of liquid metal promoted wiid.
  • the delivery rate is then reduced again to the initial value and the liquid metal level 6 of the prechamber is brought to the previous setpoint.
  • the valve 13 is opened at the end of the conveying process and a surge of protective gas is let into the outlet chamber 8. This prevents the entry of oxygen into the casting head 1.
  • the proposed pouring head is particularly suitable for conveying liquid metal in connection with electromagnetic feed pumps, since these have good controllability and fast response times.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)

Abstract

1. Casting head (1) for a liquid metal dosing arrangement with a pre-chamber (4), an overflow section (7) and an outlet chamber (8) and, if applicable, a protective gas infeed (10), characterised in that a level-measuring device (5) for continuously measuring the level in the pre-chamber, preferably an inductive level-meter, is arranged in the pre-chamber (4).

Description

Die vorliegende Erfindung betrifft einen Gießkopf für eine Flüssigmetalldosiervorrichtung nach dem Oberbegriff des Anspruchs 1 sowie ein Verfahren zu seiner Benutzung. Die genaue Dosierung von Flüssigmetall, insbesondere von aggressivem Flüssigmetall, wie beispielsweise Magnesium und dessen Legierungen, stellt hohe Anforderungen an die Förder- und Dosiereinrichtungen.The present invention relates to a casting head for a liquid metal dosing device according to the preamble of claim 1 and a method for its use. The exact metering of liquid metal, especially aggressive liquid metal, such as magnesium and its alloys, places high demands on the conveying and metering devices.

Aus einem Prospekt der Norsk Hydro Magnesiumgesellschaft mbH "Magnesium automatisch gießen mit NORMAGIC®-Dosiereinrichtung" ist bereits ein Gießkopf nach dem Oberbegriff des Anspruchs 1 bekannt. Dieser Gießkopf weist allerdings eine Vorkammer mit einer Art Rückschlagventil mit einer Kugel als Schließorgan auf, und wird pneumatisch gesteuert.A casting head according to the preamble of claim 1 is already known from a brochure from Norsk Hydro Magnesiumgesellschaft mbH "Automatically pouring magnesium with NORMAGIC® dosing device". However, this pouring head has a prechamber with a kind of check valve with a ball as a closing element, and is controlled pneumatically.

Aus der EP-A-O 095 620 ist außerdem bekannt, einen Füllstandsfühler am Ende eines Zustellrohres einer Flüssigmetallfördereinrichtung anzubringen und damit den Flüssigmetallfüllstand in Förderpausen auf einem bestimmten Niveau im Zustellrohr zu halten.From EP-A-0 095 620 it is also known to mount a fill level sensor at the end of a feed pipe of a liquid metal conveying device and thus to keep the liquid metal fill level at a certain level in the feed pipe during breaks in delivery.

Aufgabe der vorliegenden Erfindung ist ein Gießkopf, der ein besonders präzises Dosieren von Flüssigmetall, insbesondere aggressivem Flüssigmetall wie Magnesium, ermöglicht, sowie ein Verfahren zu seiner Benutzung.The object of the present invention is a casting head which enables particularly precise dosing of liquid metal, in particular aggressive liquid metal such as magnesium, and a method for its use.

Zur Losung dieser Aufgabe wird gemäß dem Anspruch 1 vorgeschlagen, daß in der Vorkammer des Gießkopfes eine Füllstandsmeßeinrichtung, vorzugsweise ein induktiver Füllstandsmesser angeordnet sein soll. Die Anbringung einer Füllstandsmeßeinrichtung im Inneren der Vorkammer, d. h. im vom Flüssigmetall durchfluteten Bereich, weist entscheidende Vorteile in der Meßgenauigkeit gegenüber Anordnungen, bei denen der Flüssigmetallfühler außerhalb des Zustellrohres angeordnet wird, auf. Außerdem behindert der Füllstandsfühler nicht die Anbringung einer Begleitheizung außerhalb des Gießkopfes. Mit Hilfe einer solchen Füllstandsmeßeinrichtung kann der Flüssigmetallspiegel in Förderpausen auf eine genau definierte Höhe in der Vorkammer eingeregelt werden, was für eine präzise Dosierung nötig ist.To solve this problem it is proposed according to claim 1 that a level measuring device, preferably an inductive level meter, should be arranged in the prechamber of the casting head. The attachment of a level measuring device inside the prechamber, d. H. in the area flooded by the liquid metal, has decisive advantages in the measuring accuracy compared to arrangements in which the liquid metal sensor is arranged outside the feed pipe. In addition, the level sensor does not hinder the installation of trace heating outside the pouring head. With the aid of such a fill level measuring device, the liquid metal level can be adjusted to a precisely defined height in the prechamber during conveying breaks, which is necessary for precise dosing.

In weiterer Ausgestaltung der Erfindung wird im Anspruch 2 vorgeschlagen, daß in dem Uberlaufabschnitt oder der Auslaßkammer des Gießkopfes eine Drosselstelle vorhanden ist. Während ohne das Vorhandensein einer Drosselstelle jedwede Ablagerung im Bereich des Förderrohres zu einer deutlichen Verringerung der Förderleistung führen würde, bewirkt eine definierte Drosselstelle, daß selbst bei Ablagerungen im Bereich des Fördersystems immer noch annähernd eine konstante Förderleistung während der Förderzeiten erbracht wird. Dadurch ist eine Dosierung durch rein zeitliche Steuerung mit genügender Präzision möglich.In a further embodiment of the invention it is proposed in claim 2 that a throttle point is present in the overflow section or the outlet chamber of the casting head. While without the presence of a throttling point any deposit in the area of the conveyor pipe would lead to a significant reduction in the delivery rate, a defined throttling point means that even with deposits in the area of the conveyor system an almost constant delivery rate is still achieved during the delivery times. This enables dosing by means of purely time control with sufficient precision.

In spezieller Ausgestaltung der Erfindung wird demgemäß im Anspruch 3 vorgeschlagen, daß die Drosselstelle den Förderquerschnitt um etwa einen Faktor 3 bis 10,. vorzugsweise etwa 5 reduzieren soll. Diese Dimensionierung der Drosselstellen hat sich für eine konstante Förderleistung über längere Betriebszeiträume als günstig erwiesen.In a special embodiment of the invention it is accordingly proposed in claim 3 that the throttle point the cross section of the conveyor by about a factor of 3 to 10. should preferably reduce about 5. This dimensioning of the throttling points has proven to be favorable for a constant delivery rate over longer operating periods.

Weiterhin wird im Anspruch 4 vorgeschlagen, daß die Auslaßkammer des Gießkopfes an ihrem Ende einen Verschlußschieber aufweisen soll. Dieser Verschlußschieber dient nicht primär zur Unterbrechung des Flüssigmetallstromes, da dieser durch eine Regelung der Förderpumpe erfclgt. Der Verschlußschieber verhindert jedoch einerseits ein Nachtropfen und andererseits eine zu starke Oxidation im Inneren des Gießkopfes, insbesondere in Verbindung mit einer Schutzgaszufuhreinrichtung, wie anhand der Zeichnung noch näher erläutert wird.It is further proposed in claim 4 that the outlet chamber of the casting head should have a closure slide at its end. This slide valve is not primarily used to interrupt the liquid metal flow, since this is done by regulating the feed pump. However, the closure slide prevents dripping on the one hand and on the other hand excessive oxidation in the interior of the casting head, in particular in connection with a protective gas supply device, as will be explained in more detail with reference to the drawing.

Im Anspruch 5 wird ferner vorgeschlagen, daß die Auslaßkammer des Gießkopfes mit einer Schutzgaszufuhreinrichtung verbunden sein soll, die ein gesteuertes stoßweises Zuführen von Schutzgas, vorzugsweise Argon, ermöglicht. Wie sich gezeigt hat, stellt die Oxidation von Flüssigmetall im Inneren des Gießkopfes während der Förderpausen durch die entstehenden Ablagerungen ein besonderes Problem für den Langzeitbetrieb dar. Bei manchen Flüssigmetallen, insbesondere auch bei Magnesium,muß daher der Zutritt von Sauerstoff durch Zuführen von Schutzgas verhindert werden. Es hat sich als günstig erwiesen, das Schutzgas unmittelbar bei Beendigung des Fördervorganges in einem Schwall zuzuführen, wodurch Umgebungsluft erst gar nicht in die Auslaßkammer eindringen kann. Wird außerdem noch ein Verschlußschieber am Ende der Auslaßkammer geschlossen, so ist auch der Verbrauch an Schutzgas nicht übermäßig hoch und ein Eindringen von Sauerstoff wird wirkungsvoll verhindert.In claim 5 it is further proposed that the outlet chamber of the casting head should be connected to a protective gas supply device which enables controlled, intermittent supply of protective gas, preferably argon. As has been shown, the oxidation of liquid metal in the interior of the casting head during the breaks in delivery is a particular problem for long-term operation due to the deposits formed. For some liquid metals, especially magnesium, the access of oxygen must therefore be prevented by adding protective gas . It has proven to be advantageous to supply the protective gas in a gush immediately at the end of the conveying process, as a result of which ambient air cannot even enter the outlet chamber. If a slide valve is also closed at the end of the outlet chamber, the consumption of protective gas is also not excessively high and an ingress of oxygen is effectively prevented.

Ein entsprechendes Verfahren zur Dosierung von Flüssigmetall mittels einer Förderpumpe unter Benutzung eines erfindungsgemäßen Gießkopfes wird in Anspruch 6 beschrieben. Danach wird in Förderpausen durch Regelung der Pumpleistung der Flüssigmetallspiegel mittels einer Füllstandsmessung möglichst genau auf einen Sollwert in der Vorkammer eingependelt. Zur Abgabe einer Portion Flüssigmetall wird die Pumpleistung um einen vorgebbaren Betrag und für eine vorgebbare Zeit erhöht. Nach Ablauf dieser Zeit wird die Pumpleistung wieder schlagartig herabgesetzt und gleichzeitig ein Schwall Schutzgas durch die Schutzgaseinspeisung der Auslaßkammer des Gießkopfes zugeführt. Die Auslaßkammer wird während der Förderpausen durch einen Schieber oder dergleichen verschlossen, wobei weiterhin ein geringer Schutzgasstrom zum Ausgleich von Verlusten durch Undichtigkeiten zugeführt wird. Das so beschriebene Verfahren ermöglicht eine sichere und präzise Portionierung von Flüssigmetall, insbesondere Magnesium, bei gleichzeitig langer Lebensdauer des Gießkopfes.A corresponding method for metering liquid metal by means of a feed pump using a casting head according to the invention is described in claim 6. After that, during pumping breaks by regulating the pump output the liquid metal level is leveled as precisely as possible to a target value in the antechamber by means of a level measurement. To dispense a portion of liquid metal, the pump power is increased by a predeterminable amount and for a predefinable time. After this time, the pump power is suddenly reduced again and at the same time a surge of protective gas is fed through the protective gas feed into the outlet chamber of the casting head. The outlet chamber is closed by a slide or the like during the pauses in delivery, a small flow of shielding gas to compensate for losses due to leaks also being supplied. The process described in this way enables safe and precise portioning of liquid metal, in particular magnesium, with a long service life of the casting head.

Ein Ausführungsbeispiel der Erfindung und seine Einbindung in ein Fördersystem werden anhand der Zeichnung näher erläutert.An embodiment of the invention and its integration in a conveyor system are explained in more detail with reference to the drawing.

Die Zeichnung zeigt in schematischer Darstellung ein Dosiersystem für Flüssigmetall mit seinen zugehörigen Regeleinrichtungen. Besonders im Maßstab herausgestellt ist der Gießkopf 1, welcher von einer Flüssigmetallförderpumpe 2 über ein Zuführrohr 3 mit Flüssigmetall gefüllt werden kann. Das Flüssigmetall stammt aus einem hier nicht dargestellten üblichen Schmelzenbehälter oder dergleichen. Der Gießkopf 1 weist eine Vorkammer 4, einen Überlaufabschnitt 7 und eine Auslaßkammer 8 auf. In der Vorkammer 4 ist eine Füllstandsmeßanordnung 5 angeordnet, und zwar vorzugsweise ein induktiver Füllstandsmesser, welcher von unten in ein entsprechendes Sackrchr einführbar ist. Mittels dieses Füllstandsmessers 5 kann der Flüssigmetallspiegel 6 in der Vorkammer 4 genau gemessen und in den Förderpausen auf einen ganz bestimmten Sollwert präzise eingeregelt werden. Der Überlaufabschnitt 7 bzw., wie hier dargestellt die Auslaßkammer S weist eine Drosselstelle 9 auf, welche einen definierten Förderquerschnitt für das Flüssigmetall bildet. Ferner weist die Auslaßkammer 8, vorzugsweise hinter der Drosselstelle 9 eine Schutzgaseinspeisung 10 auf, durch welche Schutzgas zugeführt werden kann. Ein Verschlußschieber 11 am unteren Ende 12 der Auslaßkammer 8, ermöglicht ein Verschließen der Auslaßkammer in Förderpausen. Ein steuerbares Ventil 13 ermöglicht die schwallweise Zufuhr von Schutzgas aus einem Vorratsbehälter 14. Eine zentrale Steuerelektronik 16 steuert den gesamten Dosiervorgang. Dazu wird die Elektronik zunächst mit den in einer Füllstandsmeßelektronik 15 gemessenen Füllstandswerten in der Vorkammer 4 beaufschlagt. Daraus bestimmt die Steuerelektronik 16 die Förderleistung der Förderpumpe 2 in den Förderpausen, so daß ein präziser Füllstand 6 eingehalten werden kann. Während der Förderzeiten erhöht die Steuerschaltung 16 die Förderleistung für eine bestimmte Zeit um einen bestimmten Betrag, so daß die gewünschte Flüssigmetallmenge gefördert wiid. Anschließend wird die Förderleistung wieder auf den Ausgangswert reduziert und der Flüssigmetallspiegel 6 der Vorkammer auf den vorherigen Sollwert gebracht. Gleichzeitig wird bei Beendigung des Fördervorganges das Ventil 13 geöffnet und ein Schwall Schutzgas in die Auslaßkammer 8 eingelassen. Dadurch wird der Zutritt von Sauerstoff in den Gießkopf 1 verhindert. Durch Schließen des Verschlußschiebers 11 wird die sauerstofffreie Atmosphäre im Gießkopf 1 erhalten und ein Nachtropfen verhindert. Der vorgeschlagene Gießkopf eignet sich in besonderer Weise zur Förderung von Flüssigmetall in Verbindung mit elektromagnetischen Förderpumpen, da diese eine gute Regelbarkeit und schnelle Ansprechzeiten besitzen.The drawing shows a schematic representation of a metering system for liquid metal with its associated control devices. The casting head 1, which can be filled with liquid metal by a liquid metal feed pump 2 via a feed pipe 3, is particularly emphasized in scale. The liquid metal comes from a conventional melt container or the like, not shown here. The casting head 1 has a prechamber 4, an overflow section 7 and an outlet chamber 8. A fill level measuring arrangement 5 is arranged in the antechamber 4, and preferably an inductive fill level meter, which can be inserted from below into a corresponding sack tube. By means of this fill level meter 5, the liquid metal level 6 in the antechamber 4 can be measured precisely and precisely adjusted to a specific target value in the delivery pauses. The overflow portion 7 or, as shown here, the outlet chamber S has a throttle point 9, g a defined conveying cross-section for the metal Flüssi forms. Furthermore, the outlet chamber 8, preferably behind the throttle point 9, has a protective gas feed 10 through which protective gas can be supplied. A slide valve 11 at the lower end 12 of the outlet chamber 8 enables the outlet chamber to be closed during breaks in delivery. A controllable valve 13 enables protective gas to be supplied in gushes from a storage container 14. Central control electronics 16 control the entire metering process. For this purpose, the electronics are first subjected to the level values measured in a level measuring electronics 15 in the prechamber 4. From this, the control electronics 16 determines the delivery rate of the delivery pump 2 during the delivery breaks, so that a precise fill level 6 can be maintained. During the delivery times, the control circuit 16 increases the delivery rate for a certain time by a certain amount, so that the desired amount of liquid metal promoted wiid. The delivery rate is then reduced again to the initial value and the liquid metal level 6 of the prechamber is brought to the previous setpoint. At the same time, the valve 13 is opened at the end of the conveying process and a surge of protective gas is let into the outlet chamber 8. This prevents the entry of oxygen into the casting head 1. By closing the slide valve 11, the oxygen-free atmosphere in the casting head 1 is maintained and dripping is prevented. The proposed pouring head is particularly suitable for conveying liquid metal in connection with electromagnetic feed pumps, since these have good controllability and fast response times.

Claims (6)

1. Gießkopf (1) für eine Flüssigmetalldosiervorrichtung mit einer Vorkammer (4), einem Überlaufabschnitt (7) und einer Auslaßkammer (8), und gegebenenfalls einer Schutzgaseinspeisung (10),
dadurch gekennzeichnet ,
daß in der Vorkammer (4) eine Füllstandsmeßeinrichtung (5), vorzugsweise ein induktiver Füllstandsmesser, angeordnet ist.1. casting head (1) for a liquid metal metering device with a prechamber (4), an overflow section (7) and an outlet chamber (8), and optionally a protective gas feed (10),
characterized ,
that a level measuring device (5), preferably an inductive level meter, is arranged in the prechamber (4). 2. Gießkopf , insbesondere nach Anspruch 1, dadurch gekennzeichnet ,
daß in dem Überlaufabschnitt (7) oder der Auslaßkammer (8) eine Drosselstelle (9) vorhanden ist.2. Casting head, in particular according to claim 1, characterized in
that a throttle point (9) is present in the overflow section (7) or the outlet chamber (8). 3. Gießkopf nach Anspruch 2,
dadurch gekennzeichnet ,
daß die Drosselstelle (9) den Förderquerschnitt etwa um einen Faktor 3 bis 10, vorzugsweise etwa 5, reduziert.3. casting head according to claim 2,
characterized ,
that the throttle point (9) reduces the conveying cross section by a factor of 3 to 10, preferably about 5. 4. Gießkopf nach Anspruch 1, 2 oder 3,
dadurch gekennzeichnet,
daß die Auslaßkammer (8) an ihrem Ende (12) einen Verschlußschieber (11) aufweist.4. casting head according to claim 1, 2 or 3,
characterized,
that the outlet chamber (8) has a closure slide (11) at its end (12). 5. Gießkopf nach Anspruch 1, 2, 3 oder 4,
dadurch gekennzeichnet ,
daß die Auslaßkammer (8) mit einer Schutzgaszufuhreinrichtung (10, 13, 14) verbunden ist, die ein gesteuertes, stoßweises Zuführen von Schutzgas, vorzugsweise Argon, ermöglicht.5. casting head according to claim 1, 2, 3 or 4,
characterized ,
that the outlet chamber (8) is connected to a protective gas supply device (10, 13, 14) which enables controlled, intermittent supply of protective gas, preferably argon. 6. Verfahren zur Dosierung von Flüssigmetall mittels einer Förderpumpe (2) unter Benutzung eines Gießkopfes (1), der eine Vorkammer (4), einen überlaufabschnitt (7) und eine Auslaßkammer (8) sowie eine Schutzgaseinspeisung (10) aufweist,
gekennzeichnet durch
folgende Merkmale: a) In Förderpausen wird durch Regelung der Pumpleistung der Flüssigmetallspiegel (6) mittels einer Füllstandsmessung möglichst genau auf einen Sollwert in der Vorkammer (4) eingependelt. b) Zur Abgabe einer Portion Flüssigmetall wird die Pumpleistung um einen vorgebbaren Betrag und für eine vorgebbare Zeit erhöht. c) Nach Ablauf dieser Zeit wird die Pumpleistung wieder schlagartig herabgesetzt und gleichzeitig ein Schwall Schutzgas durch die Schutzgaseinspeisung (10) der Auslaßkammer (8) zugeführt. d) Die Auslaßkammer (8) wird während der Förderpausen durch einen Schieber (12) oder dergleichen verschlossen, wobei weiterhin ein geringer Schutzgasstrom zum Ausgleich von Verlusten durch Undichtigkeiten zugeführt wird. 6. Method for metering liquid metal by means of a feed pump (2) using a casting head (1) which has a prechamber (4), an overflow section (7) and an outlet chamber (8) and a protective gas feed (10),
marked by
following features: a) In pumping pauses, the liquid metal level (6) is leveled out as precisely as possible to a desired value in the antechamber (4) by regulating the pumping power by means of a level measurement. b) To dispense a portion of liquid metal, the pump power is increased by a predeterminable amount and for a predefinable time. c) After this time, the pump power is suddenly reduced again and at the same time a surge of protective gas is fed through the protective gas feed (10) to the outlet chamber (8). d) The outlet chamber (8) is closed during the breaks in delivery by a slide (12) or the like, with a small flow of inert gas to compensate for losses caused by leaks.
EP86113281A 1985-10-07 1986-09-26 Casting head for a liquid metal metering apparatus, and method for using it Expired EP0221331B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86113281T ATE41341T1 (en) 1985-10-07 1986-09-26 POURING HEAD FOR A LIQUID METAL DOSING DEVICE AND METHOD OF USE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3535780 1985-10-07
DE3535780 1985-10-07

Publications (2)

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EP0221331A1 true EP0221331A1 (en) 1987-05-13
EP0221331B1 EP0221331B1 (en) 1989-03-15

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AT (1) ATE41341T1 (en)
DE (1) DE3662341D1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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Cited By (3)

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Publication number Priority date Publication date Assignee Title
WO1991005625A1 (en) * 1989-10-20 1991-05-02 Tbs Engineering Limited Casting apparatus for connecting a battery plate to a metal strap
AU631940B2 (en) * 1989-10-20 1992-12-10 Tbs Engineering Limited Casting apparatus for connecting a battery plate to a metal strap
US5240063A (en) * 1989-10-20 1993-08-31 Hopwood Robert T Casting apparatus for connecting a battery plate to a metal strap

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EP0221331B1 (en) 1989-03-15
DE3662341D1 (en) 1989-04-20
ATE41341T1 (en) 1989-04-15

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