EP0609196A1 - Double chamber furnace for the charging of casting machines with molten metal - Google Patents

Double chamber furnace for the charging of casting machines with molten metal Download PDF

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Publication number
EP0609196A1
EP0609196A1 EP94890018A EP94890018A EP0609196A1 EP 0609196 A1 EP0609196 A1 EP 0609196A1 EP 94890018 A EP94890018 A EP 94890018A EP 94890018 A EP94890018 A EP 94890018A EP 0609196 A1 EP0609196 A1 EP 0609196A1
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EP
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Prior art keywords
chamber
melt
removal
storage chamber
storage
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EP94890018A
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German (de)
French (fr)
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EP0609196B1 (en
Inventor
Erich Rauch
Josef Rapp
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RAUCH FERTIGUNGSTECH GmbH
Ing Rauch Fertigungstechnik GmbH
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RAUCH FERTIGUNGSTECH GmbH
Ing Rauch Fertigungstechnik GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/04—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces of multiple-hearth type; of multiple-chamber type; Combinations of hearth-type furnaces

Definitions

  • the invention relates to a two-chamber furnace for the melt loading of casting machines, with a storage chamber having a material feed device, a removal chamber having a melt removal device and a melt pump for transferring the melt from the storage chamber into the removal chamber, comprising a control device for the melt fill level in the removal chamber.
  • melt is pumped directly from the storage chamber into the removal chamber, an overflow being able to prevent overfilling of the removal chamber.
  • This level control device is therefore relatively complex, it leads to the melt bath in the removal chamber being disturbed by the amount of melt that flows in and, moreover, the two chambers remain in contact with one another at least with regard to their atmosphere, which inevitably leads to undesirable oxidation phenomena in the melt due to the air admission when the material is refilled.
  • the invention is therefore based on the object of eliminating these deficiencies and of rationally improving a two-chamber furnace of the type described above with regard to its function and effect.
  • the invention solves this problem in that an intermediate chamber is provided between the removal chamber and storage chamber, which communicates with the removal chamber on the one hand communicating via a compensating opening and on the other hand communicates with the storage chamber via an overflow, and in that the melt pump transfers the melt from the storage chamber into the Intermediate chamber promotes.
  • This intermediate chamber creates a lock located upstream of the removal chamber, which allows a complete separation between the store and the removal chamber. Since the melt is not fed directly into the removal chamber, but rather into the storage chamber for refilling the amount of feed removed, and the intermediate chamber with the storage chamber merely gives a communicating container, the melt can also be refilled in the removal chamber without causing an undesired bath movement. Apart from this, it is possible, due to the overflow of the intermediate chamber, by correspondingly overdosing the melt refill quantity, to adhere very precisely to the fill level in the removal container determined by the overflow height, without the need for expensive control devices and sensors.
  • the removal chamber, the intermediate chamber and the storage chamber are tightly covered and gas lines open into the chambers to build up a protective gas atmosphere, the risk of oxidation for the melt can be easily eliminated Air access can be secured and a protective gas atmosphere can be applied, and the intermediate and storage chamber are also protected from air access by a suitable cover and protective gas. If the material feed device is also equipped with a suitable closure and preferably its own protective gas purging device, the protective gas atmosphere is retained even when the material is refilled.
  • a two-chamber furnace 1 with its insulating housing 2 and corresponding heating devices 3, 4 has a furnace insert 5 which forms two chambers, a storage chamber 6 and a removal chamber 7.
  • a tubular material feed device 8 leads into the storage chamber 6 and a melt removal device 9 projects into the removal chamber 7 for the actual loading of the casting machine.
  • an intermediate chamber 10 is provided which communicatively connects to the removal chamber 7 via a compensating opening 11 and is connected to the storage chamber 6 via an overflow pipe 12.
  • covers 14, 15 are provided and gas lines 16, 17 opening into the removal and storage chamber 7, 6 allow a protective gas atmosphere to be built up inside the chambers.
  • the material supply device 8 is provided with a suitable closure 18 and can be flushed with protective gas via a gas supply line 19.
  • the material to be cast is melted or kept warm in the storage chamber 6 and comes ready for pouring into the removal chamber 7, with a complete separation between the removal and storage chambers taking place through the intermediate chamber 10 and therefore the preparation measures in the storage chamber without a harmful reaction to the removal conditions the removal chamber 7 can be performed.
  • the melt pump 13 conveys processed melt from the storage chamber 6 into the intermediate chamber 10, so that the bath level in the removal chamber 7 is kept constant without unwanted bath movement.
  • the overflow 12 allows a fill level height determination in a simple manner by suitable overfilling of the intermediate chamber 10, the excess amount flowing back into the storage chamber through the overflow 12. Therefore, if the pump running time and thus the delivery rate are adapted to the time required for the casting machine to melt, there is an exact control of the filling level in the removal chamber 7 without expensive melt level sensors or the like.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Casting Devices For Molds (AREA)

Abstract

A double chamber furnace (1) for the charging of casting machines forms a storage chamber (6), having a material feed device (8), and a withdrawal chamber (7), having a molten-metal withdrawal device (9), and is equipped with a regulating device for the molten-metal filling height in the withdrawal chamber (7), which regulating device comprises a molten-metal pump (13) for transferring the molten metal from the storage chamber (6) to the withdrawal chamber (7). In order to improve the action and functioning of the double chamber furnace, an intermediate chamber (10) is provided between withdrawal chamber (7) and storage chamber (6), the intermediate chamber, on the one hand, being linked to the withdrawal chamber (7) in communicating fashion via an equalising opening (11) and, on the other hand, being connected to the storage chamber (6) via an overflow (12), and the molten-metal pump (13) conveys the molten metal from the storage chamber (6) into the intermediate chamber (10). <IMAGE>

Description

Die Erfindung bezieht sich auf einen Zweikammerofen zur Schmelzenbeschickung von Gießmaschinen, mit einer eine Materialzufuhreinrichtung aufweisenden Speicherkammer, einer eine Schmelzenentnahmeeinrichtung aufweisenden Entnahmekammer und einer eine Schmelzenpumpe zum Umfüllen der Schmelze aus der Speicherkammer in die Entnahmekammer umfassenden Regelungseinrichtung für die Schmelzenfüllhöhe in der Entnahmekammer.The invention relates to a two-chamber furnace for the melt loading of casting machines, with a storage chamber having a material feed device, a removal chamber having a melt removal device and a melt pump for transferring the melt from the storage chamber into the removal chamber, comprising a control device for the melt fill level in the removal chamber.

Solche Zweikammerofen haben sich bereits durchaus bewährt, da in der Speicherkammer das zu verarbeitende Material getrennt von der Entnahmekammer aufbereitet werden kann und sich daher die zur Gießmaschinenbeschickung aus der Entnahmekammer entnommene Schmelzenmenge gleich durch gießfertiges Schmelzenmaterial ersetzen läßt, was größere Schwankungen hinsichtlich der qualitätsentscheidenden Schmelzen-Entnahmebedingungen vermeidet. Bei den bekannten Zweikammeröfen wird allerdings zur Konstanthaltung der Schmelzenfüllhöhe in der Entnahmekammer in Abhängigkeit vom jeweils über Sensoren od. dgl. erfaßbaren Schmelzenspiegel Schmelze aus der Speicherkammer direkt in die Entnahmekammer gepumpt, wobei ein Überlauf zur Verhinderung eines Überfüllens der Entnahmekammer vorgesehen sein kann. Diese Füllstandshöhenregelungseinrichtung ist somit relativ aufwendig, sie führt zu einer Beunruhigung des Schmelzenbades in der Entnahmekammer durch die nachfließende Schmelzenmenge und außerdem bleiben die beiden Kammern zumindest hinsichtlich ihrer Atmosphäre miteinander in Verbindung, was wegen des Luftzutritts beim Nachfüllen des Materials zwangsweise zu unerwünschten Oxydationserscheinungen bei der Schmelze führt.Such two-chamber furnaces have already proven themselves, since the material to be processed can be processed separately from the removal chamber in the storage chamber and therefore the amount of melt removed from the removal chamber for casting machine loading can be replaced immediately by cast-ready melt material, which leads to greater fluctuations in terms of the quality-determining melt removal conditions avoids. In the known two-chamber furnaces, however, in order to keep the melt filling level in the removal chamber constant, depending on the melt level detectable by sensors or the like in each case, melt is pumped directly from the storage chamber into the removal chamber, an overflow being able to prevent overfilling of the removal chamber. This level control device is therefore relatively complex, it leads to the melt bath in the removal chamber being disturbed by the amount of melt that flows in and, moreover, the two chambers remain in contact with one another at least with regard to their atmosphere, which inevitably leads to undesirable oxidation phenomena in the melt due to the air admission when the material is refilled.

Der Erfindung liegt daher die Aufgabe zugrunde, diese Mängel zu beseitigen und einen Zweikammerofen der eingangs geschilderten Art auf rationelle Weise hinsichtlich seiner Funktion und Wirkung zu verbessern.The invention is therefore based on the object of eliminating these deficiencies and of rationally improving a two-chamber furnace of the type described above with regard to its function and effect.

Die Erfindung löst diese Aufgabe dadurch, daß zwischen Entnahmekammer und Speicherkammer eine Zwischenkammer vorgesehen ist, die einerseits über eine Ausgleichsöffnung kommunizierend an die Entnahmekammer anschließt und anderseits über einen Überlauf mit der Speicherkammer in Verbindung steht, und daß die Schmelzenpumpe die Schmelze aus der Speicherkammer in die Zwischenkammer fördert. Durch diese Zwischenkammer entsteht eine der Entnahmekammer vorgeordnete Schleuse, die eine vollständige Trennung zwischen Speicher und Entnahmekammer erlaubt. Da die Schmelze zum Nachfüllen der entnommenen Beschickungsmenge nicht direkt in die Entnahmekammer, sondern in die Speicherkammer gefördert wird und die Zwischenkammer mit der Speicherkammer lediglich einen kommunizierenden Behälter ergibt, kann Schmelze auch in der Entnahmekammer nachgefüllt werden, ohne daß es zu einer unerwünschten Badbewegung kommt. Abgesehen davon ist es möglich, aufgrund des Überlaufes der Zwischenkammer durch eine entsprechende Überdosierung der Schmelzennachfüllmenge die durch die Überlaufhöhe bestimmte Füllstandshöhe im Entnahmebehälter sehr exakt einzuhalten, ohne dazu aufwendige Regelungseinrichtungen und Sensoren zu benötigen.The invention solves this problem in that an intermediate chamber is provided between the removal chamber and storage chamber, which communicates with the removal chamber on the one hand communicating via a compensating opening and on the other hand communicates with the storage chamber via an overflow, and in that the melt pump transfers the melt from the storage chamber into the Intermediate chamber promotes. This intermediate chamber creates a lock located upstream of the removal chamber, which allows a complete separation between the store and the removal chamber. Since the melt is not fed directly into the removal chamber, but rather into the storage chamber for refilling the amount of feed removed, and the intermediate chamber with the storage chamber merely gives a communicating container, the melt can also be refilled in the removal chamber without causing an undesired bath movement. Apart from this, it is possible, due to the overflow of the intermediate chamber, by correspondingly overdosing the melt refill quantity, to adhere very precisely to the fill level in the removal container determined by the overflow height, without the need for expensive control devices and sensors.

Sind die Entnahmekammer, die Zwischenkammer und die Speicherkammer dicht abgedeckt und münden Gasleitungen zum Aufbau einer Schutzgasatmosphäre in die Kammern, läßt sich auf einfache Weise die Oxydationsgefahr für die Schmelze bannen, a einerseits die von den übrigen Ofenkammern vollständig abgetrennte Entnahmekammer gut und sicher vor einem unerwünschten Luftzutritt gesichert und mit einer Schutzgasatmosphäre beaufschlagt werden kann und auch die Zwischen- und Speicherkammer durch eine geeignete Abdeckung und Schutzgasbeaufschlagung vor einem Luftzutritt geschützt sind. Wird die Materialzufuhreinrichtung ebenfalls mit einem geeigneten Verschluß und vorzugsweise einer eigenen Schutzgasspüleinrichtung ausgestattet,bleibt die Schutzgasatmosphäre auch bei einer Materialnachfüllung erhalten.If the removal chamber, the intermediate chamber and the storage chamber are tightly covered and gas lines open into the chambers to build up a protective gas atmosphere, the risk of oxidation for the melt can be easily eliminated Air access can be secured and a protective gas atmosphere can be applied, and the intermediate and storage chamber are also protected from air access by a suitable cover and protective gas. If the material feed device is also equipped with a suitable closure and preferably its own protective gas purging device, the protective gas atmosphere is retained even when the material is refilled.

In der Zeichnung ist ein erfindungsgemäßer Zweikammerofen beispielsweise an Hand einer rein schematischen Schnittdarstellung näher veranschaulicht.In the drawing, a two-chamber furnace according to the invention is illustrated in more detail, for example, using a purely schematic sectional illustration.

Ein Zweikammerofen 1 mit seinem Isoliergehäuse 2 und entsprechenden Heizeinrichtungen 3, 4 weist einen Ofeneinsatz 5 auf, der zwei Kammern, eine Speicherkammer 6 und eine Entnahmekammer 7, bildet. In die Speicherkammer 6 führt eine rohrförmige Materialzufuhreinrichtung 8 und in die Entnahmekammer 7 ragt eine Schmelzenentnahmeeinrichtung 9 zur eigentlichen Gießmaschinenbeschickung. Zwischen Speicherkammer 6 und Entnahmekammer 7 ist eine Zwischenkammer 10 vorgesehen, die einerseits über eine Ausgleichsöffnung 11 kommunizierend an die Entnahmekammer 7 anschließt und anderseits über ein Überlaufrohr 12 mit der Speicherkammer 6 in Verbindung steht. Eine Schmelzenpumpe 13 einer Regelungseinrichtung für die Schmelzenfüllhöhe in der Entnahmekammer 7 fördert bedarfsweise in der Speicherkammer aufbereitete Schmelze zum Nachfüllen der über die Entnahmeeinrichtung 9 aus der Entnahmekammer 7 entnommenen Schmelzenmenge in die Zwischenkammer 10.A two-chamber furnace 1 with its insulating housing 2 and corresponding heating devices 3, 4 has a furnace insert 5 which forms two chambers, a storage chamber 6 and a removal chamber 7. A tubular material feed device 8 leads into the storage chamber 6 and a melt removal device 9 projects into the removal chamber 7 for the actual loading of the casting machine. Between the storage chamber 6 and the removal chamber 7, an intermediate chamber 10 is provided which communicatively connects to the removal chamber 7 via a compensating opening 11 and is connected to the storage chamber 6 via an overflow pipe 12. A melt pump 13 of a control device for the melt filling level in the removal chamber 7, if necessary, conveys melt prepared in the storage chamber for refilling the amount of melt removed from the removal chamber 7 via the removal device 9 into the intermediate chamber 10.

Zum Abschluß der Kammern sind Abdeckungen 14, 15 vorgesehen und in die Entnahme- und Speicherkammer 7, 6 mündende Gasleitungen 16, 17 erlauben den Aufbau einer Schutzgasatmosphäre innerhalb der Kammern. Um diese Atmosphäre nicht durch eine Materialzufuhr in die Speicherkammer 6 zu gefährden, ist die Materialzufuhreinrichtung 8 mit einem geeigneten Verschluß 18 versehen und über eine Gaszuleitung 19 mit Schutzgas spülbar.At the end of the chambers, covers 14, 15 are provided and gas lines 16, 17 opening into the removal and storage chamber 7, 6 allow a protective gas atmosphere to be built up inside the chambers. In order not to endanger this atmosphere by supplying material to the storage chamber 6, the material supply device 8 is provided with a suitable closure 18 and can be flushed with protective gas via a gas supply line 19.

Das zu vergießende Material wird in der Speicherkammer 6 geschmolzen bzw. warmgehalten und kommt gießfertig in die Entnahmekammer 7, wobei durch die Zwischenkammer 10 eine vollständige Trennung zwischen Entnahme- und Speicherkammern erfolgt und daher die Aufbereitungsmaßnahmen in der Speicherkammer ohne eine schädliche Rückwirkung auf die Entnahmebedingungen in der Entnahmekammer 7 durchgeführt werden können. Zur Regelung der Füllstandshöhe in der Entnahmekammer 7 fördert die Schmelzenpumpe 13 aufbereitete Schmelze aus der Speicherkammer 6 in die Zwischenkammer 10, so daß ohne ungewollte Badbewegung ein Konstanthalten des Badspiegels in der Entnahmekammer 7 gewährleistet ist. Der Überlauf 12 erlaubt auf einfache Weise eine Füllstandshöhenbestimmung durch eine geeignete Überfüllung der Zwischenkammer 10, wobei die Überschußmenge durch den Überlauf 12 wieder in die Speicherkammer zurückfließt. Wird daher die Pumpenlaufzeit und damit die Fördermenge an den zeitlichen Schmelzenbedarf der Gießmaschine angepaßt, kommt es ohne aufwendige Schmelzspiegeltaster od. dgl. Sensoren zu einer exakten Füllhöhenregelung in der Entnahmekammer 7.The material to be cast is melted or kept warm in the storage chamber 6 and comes ready for pouring into the removal chamber 7, with a complete separation between the removal and storage chambers taking place through the intermediate chamber 10 and therefore the preparation measures in the storage chamber without a harmful reaction to the removal conditions the removal chamber 7 can be performed. In order to regulate the fill level in the removal chamber 7, the melt pump 13 conveys processed melt from the storage chamber 6 into the intermediate chamber 10, so that the bath level in the removal chamber 7 is kept constant without unwanted bath movement. The overflow 12 allows a fill level height determination in a simple manner by suitable overfilling of the intermediate chamber 10, the excess amount flowing back into the storage chamber through the overflow 12. Therefore, if the pump running time and thus the delivery rate are adapted to the time required for the casting machine to melt, there is an exact control of the filling level in the removal chamber 7 without expensive melt level sensors or the like.

Claims (2)

Zweikammerofen (1) zur Schmelzenbeschickung von Gießmaschinen, mit einer eine Materialzufuhreinrichtung (8) aufweisenden Speicherkammer (6), einer eine Schmelzenentnahmeeinrichtung (9) aufweisenden Entnahmekammer (7) und einer eine Schmelzenpumpe (13) zum Umfüllen der Schmelze aus der Speicherkammer (6) in die Entnahmekammer (7) umfassenden Regelungseinrichtung für die Schmelzenfüllhöhe in der Entnahmekammer (7), dadurch gekennzeichnet, daß zwischen Entnahmekammer (7) und Speicherkammer (6) eine Zwischenkammer (10) vorgesehen ist, die einerseits über eine Ausgleichsöffnung (11) kommunizierend an die Entnahmekammer (7) anschließt und anderseits über einen Überlauf (12) mit der Speicherkammer (6) in Verbindung steht, und daß die Schmelzenpumpe die Schmelze aus der Speicherkammer (6) in die Zwischenkammer (10) fördert.Two-chamber furnace (1) for the melt loading of casting machines, with a storage chamber (6) having a material feed device (8), a removal chamber (7) having a melt removal device (9) and a melt pump (13) for transferring the melt from the storage chamber (6) In the removal chamber (7) comprehensive control device for the melt fill level in the removal chamber (7), characterized in that an intermediate chamber (10) is provided between the removal chamber (7) and storage chamber (6), which communicates via a compensating opening (11) the removal chamber (7) connects and on the other hand is connected to the storage chamber (6) via an overflow (12), and that the melt pump conveys the melt from the storage chamber (6) into the intermediate chamber (10). Zweikammerofen nach Anspruch 1, dadurch gekennzeichnet, daß die Entnahmekammer (7), die Zwischenkammer (10) und die Speicherkammer (6) dicht abgedeckt sind und Gasleitungen (16, 17, 19) zum Aufbau einer Schutzgasatmosphäre in die Kammern (7, 6) münden.Two-chamber furnace according to claim 1, characterized in that the removal chamber (7), the intermediate chamber (10) and the storage chamber (6) are covered tightly and gas lines (16, 17, 19) for building up a protective gas atmosphere in the chambers (7, 6) flow out.
EP94890018A 1993-01-26 1994-01-24 Double chamber furnace for the charging of casting machines with molten metal Expired - Lifetime EP0609196B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0011593A AT401302B (en) 1993-01-26 1993-01-26 TWO-CHAMBER OVEN FOR MELTING OF MOLDED CASTING MACHINES
AT115/93 1993-01-26

Publications (2)

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EP0609196A1 true EP0609196A1 (en) 1994-08-03
EP0609196B1 EP0609196B1 (en) 1996-03-20

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EP94890018A Expired - Lifetime EP0609196B1 (en) 1993-01-26 1994-01-24 Double chamber furnace for the charging of casting machines with molten metal

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US (1) US5411240A (en)
EP (1) EP0609196B1 (en)
JP (1) JPH074850A (en)
AT (1) AT401302B (en)
DE (1) DE59400160D1 (en)
ES (1) ES2085184T3 (en)
NO (1) NO301998B1 (en)

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DE1508560B2 (en) * 1966-11-21 1970-08-06 Brown, Boveri & Cie Ag, 6800 Mannheim Method and device for emptying melting or holding furnaces
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DE2050933B2 (en) * 1969-11-18 1977-03-31 Georg Fischer Ag, Schaffhausen (Schweiz) CONTAINER FOR ACCEPTING AND DISPENSING LIQUID METAL

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DE1508560B2 (en) * 1966-11-21 1970-08-06 Brown, Boveri & Cie Ag, 6800 Mannheim Method and device for emptying melting or holding furnaces
DE2050933B2 (en) * 1969-11-18 1977-03-31 Georg Fischer Ag, Schaffhausen (Schweiz) CONTAINER FOR ACCEPTING AND DISPENSING LIQUID METAL
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DE4439214A1 (en) * 1994-11-03 1996-05-09 Schmitz & Apelt Loi Industrieo Magnesium melting furnace and method for melting magnesium
DE19747002A1 (en) * 1997-10-24 1999-04-29 Audi Ag Three-chamber magnesium melting furnace
DE19747002C2 (en) * 1997-10-24 2000-09-21 Audi Ag Process for operating a magnesium melting furnace
DE19807003C2 (en) * 1997-12-26 2002-07-18 Ye Long Su Thermal container for molten metal and associated manufacturing process
WO1999048637A1 (en) * 1998-03-26 1999-09-30 Universität Hannover Method and device for handling molten metal baths, notably of magnesium and magnesium alloys
EP1997572A2 (en) 2007-05-24 2008-12-03 Meltec Industrieofenbau GmbH Melting pot with overflow for a casting machine
EP1997572A3 (en) * 2007-05-24 2009-11-04 Meltec Industrieofenbau GmbH Melting pot with overflow for a casting machine
DE102016123595A1 (en) 2016-12-06 2018-06-07 Carsten Speckmann Casting furnace for low pressure casting
DE102016123595B4 (en) 2016-12-06 2018-10-31 Carsten Speckmann Casting furnace for low pressure casting

Also Published As

Publication number Publication date
EP0609196B1 (en) 1996-03-20
NO940254D0 (en) 1994-01-25
ES2085184T3 (en) 1996-05-16
ATA11593A (en) 1995-12-15
NO301998B1 (en) 1998-01-05
DE59400160D1 (en) 1996-04-25
US5411240A (en) 1995-05-02
JPH074850A (en) 1995-01-10
NO940254L (en) 1994-07-27
AT401302B (en) 1996-08-26

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