EP2060340A1 - Device and method for low pressure die casting of metal melts - Google Patents

Device and method for low pressure die casting of metal melts Download PDF

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Publication number
EP2060340A1
EP2060340A1 EP07120039A EP07120039A EP2060340A1 EP 2060340 A1 EP2060340 A1 EP 2060340A1 EP 07120039 A EP07120039 A EP 07120039A EP 07120039 A EP07120039 A EP 07120039A EP 2060340 A1 EP2060340 A1 EP 2060340A1
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EP
European Patent Office
Prior art keywords
intermediate container
mold
casting
inoculant
channel
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.)
Withdrawn
Application number
EP07120039A
Other languages
German (de)
French (fr)
Inventor
Wilhelm Hauke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Fischer Automotive AG
Original Assignee
Georg Fischer Automotive AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Georg Fischer Automotive AG filed Critical Georg Fischer Automotive AG
Priority to EP07120039A priority Critical patent/EP2060340A1/en
Priority to JP2010531542A priority patent/JP2011502787A/en
Priority to PCT/EP2008/064895 priority patent/WO2009059952A1/en
Priority to US12/741,127 priority patent/US20100230066A1/en
Publication of EP2060340A1 publication Critical patent/EP2060340A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/007—Treatment of the fused masses in the supply runners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould

Definitions

  • the invention relates to a device for low pressure casting of metal melts with a Vergiessofen, a feed channel for the melt, a channel in the direction of the mold and a supply to the gaseous pressurization.
  • the melt In low-pressure casting, the melt is conveyed through a riser against gravity into a casting cavity by gaseous pressurization of the metallic melt in an oven.
  • Melting which receives aggregates or inoculants for reasons of nucleation before casting, are treated by gravity prior to entry into the mold in the pouring stream, in the ladle and / or in the mold itself by gravity.
  • lumpy Impfmiftel can be inserted in the region of the mold inlet during low pressure casting to go into solution during mold filling.
  • the disadvantage often associated with this is in particular that there is no satisfactory distribution of the inoculant in the molten metal in the casting mold. Different concentrations of the inoculant in the melt can lead to significant variations in the desired properties of the castings.
  • This known technique requires careful adjustment of the composition and solution behavior of the inoculant.
  • the object of the invention is to apply a device and a method for low-pressure casting so that the melt in an intermediate container, before the actual mold filling, already present with a uniformly distributed Impfstoffitzmenge.
  • the object is achieved in that an intermediate container is arranged between the casting mold and the channel, wherein an access for the addition of an inoculating agent is provided in the intermediate container.
  • the intermediate container has an overflow wall in the interior.
  • an optimal distribution of the inoculant in the melt is achieved, in particular by the flow.
  • the Fig. 1 shows a sectional view of a furnace.
  • the casting furnace 1 has a feed channel 2 for filling with molten metal 3.
  • the feed channel 2 can be closed with a cover 14.
  • a supply 6 is provided to pressurize the melt with gas pressure.
  • a channel 4 is attached to the Vergiessofen 1, where directly the intermediate container 7 connects.
  • the mold 5 is arranged, which is connected to the riser 13 via the opening 11 with the intermediate container 7.
  • a tubular extension 15 for adding the inoculant 9 is attached.
  • an overflow wall 10 is provided for the melt 3, which is arranged just behind the end of the channel 4.
  • the casting process is as follows:
  • the Vergiessofen 1 is filled via the feed channel 2 with molten metal 3. After filling the Vergiessofens 1 of the feed channel 2 is closed by a gas-tight cover 14.
  • the pressures p1, p2 and p3 correspond to the atmospheric pressure.
  • the chamber 16 is pressurized with a gaseous medium.
  • the pressure p1 is greater than the pressures p2 and p3.
  • the melt begins to flow via the channel 4 and the overflow wall 10 in the intermediate container 7.
  • the tubular Approach 15 the inoculant 9 added.
  • the addition opening between the overflow wall 10 and the mold 5 is arranged.

Abstract

Low-pressure metal casting apparatus has an intermediate tank (7) between the casting furnace (1) and the mold (5). Inoculant (9) is added to the melt (3) in this tank. An independent claim is included for a low-pressure metal casting method using the apparatus.

Description

Die Erfindung betrifft eine Vorrichtung zum Niederdruckgiessen von Metallschmelzen mit einem Vergiessofen, einem Zuführkanal für die Schmelze, einem Kanal in Richtung zur Giessform und einer Zuführung zur gasförmigen Druckbeaufschlagung.The invention relates to a device for low pressure casting of metal melts with a Vergiessofen, a feed channel for the melt, a channel in the direction of the mold and a supply to the gaseous pressurization.

Beim Niederdruckgiessen wird durch eine gasförmige Druckbeaufschlagung der metallischen Schmelze in einem Ofen die Schmelze über ein Steigrohr entgegen der Schwerkraft in einen Giesshohlraum gefördert.In low-pressure casting, the melt is conveyed through a riser against gravity into a casting cavity by gaseous pressurization of the metallic melt in an oven.

Schmelzen, die aus Gründen der Keimbildung vor dem Vergiessen Zuschlagstoffe oder Impfmittel erhalten, werden beim Giessen mittels Schwerkraft vor dem Eintritt in die Form im Giessstrahl, in der Giesspfanne und/oder in der Form selbst behandelt.Melting, which receives aggregates or inoculants for reasons of nucleation before casting, are treated by gravity prior to entry into the mold in the pouring stream, in the ladle and / or in the mold itself by gravity.

Nach dem Stand der Technik können beim Niederdruckgiessen stückige Impfmiftel im Bereich des Formeneingusses eingelegt werden, um während der Formfüllung in Lösung zu gehen. Der damit häufig verbundene Nachteil besteht insbesondere darin, dass keine zufriedenstellende Verteilung des Impfmittels in der Metallschmelze in der Giessform erfolgt. Unterschiedliche Konzentrationen des Impfmittels in der Schmelze können zu erheblichen Abweichungen der gewünschten Eigenschaften führen der Gussstücke führen. Diese bekannte Technik erfordert eine sorgfältige Einstellung der Zusammensetzung und des Lösungsverhaltens des Impfmittels.According to the prior art lumpy Impfmiftel can be inserted in the region of the mold inlet during low pressure casting to go into solution during mold filling. The disadvantage often associated with this is in particular that there is no satisfactory distribution of the inoculant in the molten metal in the casting mold. Different concentrations of the inoculant in the melt can lead to significant variations in the desired properties of the castings. This known technique requires careful adjustment of the composition and solution behavior of the inoculant.

Um diese Nachteile zu minimieren besteht die Aufgabe der Erfindung darin, eine Vorrichtung und ein Verfahren zum Niederdruckgiessen so anzuwenden, dass die Schmelze in einem Zwischenbehälter, vor der eigentlichen Formfüllung, bereits mit einer gleichmässig verteilten Impfmittelmenge vorliegt.To minimize these disadvantages, the object of the invention is to apply a device and a method for low-pressure casting so that the melt in an intermediate container, before the actual mold filling, already present with a uniformly distributed Impfmittelmenge.

Erfindungsgemäss wird die Aufgabe dadurch gelöst, dass zwischen der Giessform und dem Kanal ein Zwischenbehälter angeordnet ist, wobei in dem Zwischenbehälter ein Zugang für die Zugabe eines Impfmittels vorgesehen ist.According to the invention, the object is achieved in that an intermediate container is arranged between the casting mold and the channel, wherein an access for the addition of an inoculating agent is provided in the intermediate container.

Durch die Möglichkeit eines separaten Zugangs für die Zugabe eines Impfmittels in einen Zwischenbehälter zwischen dem Vergiessofen und der Giessform wird eine einfache Möglichkeit geboten, eine genau eingestellte Impfmittelmenge zum gewünschten Zeitpunkt zuzuführen.The possibility of a separate access for the addition of an inoculant in an intermediate container between the Vergiessofen and the mold is a offered a simple opportunity to deliver a precisely set amount of vaccine at the desired time.

Gemäss einer bevorzugten Ausführungsform weist der Zwischenbehälter im Innern eine Überlaufwand auf. In vorteilhafter Weise hat es sich gezeigt, dass bei Eingabe des Impfmittels vor der Zwischenwand eine optimale Verteilung des Impfmittels in der Schmelze insbesondere durch die Strömung erreicht wird.According to a preferred embodiment, the intermediate container has an overflow wall in the interior. Advantageously, it has been found that when the inoculant is introduced in front of the intermediate wall, an optimal distribution of the inoculant in the melt is achieved, in particular by the flow.

Weitere mögliche Ausführungsformen sind in den Unteransprüchen beschrieben.Further possible embodiments are described in the subclaims.

Ein Ausführungsbeispiel ist in der Zeichnung dargestellt.An embodiment is shown in the drawing.

Die Fig. 1 zeigt eine Schnittansicht eines Ofens.The Fig. 1 shows a sectional view of a furnace.

Der Vergiessofen 1 weist einen Zuführkanal 2 für die Befüllung mit Metallschmelze 3 auf. Der Zuführkanal 2 ist mit einem Deckel 14 verschliessbar. Am Vergiessofen 1 ist zur Beaufschlagung der Schmelze mit Gasdruck eine Zuführung 6 vorgesehen. Weiterhin ist an dem Vergiessofen 1 ein Kanal 4 angebracht, an dem sich direkt der Zwischenbehälter 7 anschliesst. Oberhalb des Zwischenbehälters 7 ist die Giessform 5 angeordnet, die mit dem Steigrohr 13 über die Öffnung 11 mit dem Zwischenbehälter 7 verbunden ist. An den Zugang 8 im Zwischenbehälter 7 ist ein rohrförmiger Ansatz 15 zur Zugabe des Impfmittels 9 angebracht. Im Innern des Zwischenbehälters 7 ist eine Überlaufwand 10 für die Schmelze 3 vorgesehen, die kurz hinter dem Ende des Kanals 4 angeordnet ist.The casting furnace 1 has a feed channel 2 for filling with molten metal 3. The feed channel 2 can be closed with a cover 14. At Vergiessofen 1, a supply 6 is provided to pressurize the melt with gas pressure. Furthermore, a channel 4 is attached to the Vergiessofen 1, where directly the intermediate container 7 connects. Above the intermediate container 7, the mold 5 is arranged, which is connected to the riser 13 via the opening 11 with the intermediate container 7. At the access 8 in the intermediate container 7, a tubular extension 15 for adding the inoculant 9 is attached. In the interior of the intermediate container 7, an overflow wall 10 is provided for the melt 3, which is arranged just behind the end of the channel 4.

Der Giessvorgang läuft wie folgt ab:The casting process is as follows:

Zunächst wird der Vergiessofen 1 über den Zuführkanal 2 mit Metallschmelze 3 befüllt. Nach dem Befüllen des Vergiessofens 1 wird der Zuführkanal 2 mittels eines Deckels 14 gasdicht verschlossen. Die Drücke p1, p2 und p3 entsprechen dem Atmosphärendruck. Zum Eisentransport in den Zwischenbehälter wird die Kammer 16 mit einem gasförmigen Medium druckbeaufschlagt. Der Druck p1 ist grösser als die Drücke p2 und p3. Die Schmelze beginnt über den Kanal 4 und die Überlaufwand 10 in den Zwischenbehälter 7 zu fliessen. Gleichzeitig wird über den rohrförmigen Ansatz 15 das Impfmittel 9 zugegeben. In der Fig. 1 ist die Zugabeöffnung zwischen der Überlaufwand 10 und der Giessform 5 angeordnet. Ebenso denkbar ist es, das Impfmittel 9 im Bereich 17, d.h. vor der Überlaufwand 10 zuzugeben. Infolge der Strömung der Metallschmelze 3 wird das Impfmittel 9 homogen mit der Metallschmelze 3 vermischt. Um die Giessform 5 zu füllen, muss der zu der Höhe ΔH korrespondierende Druck p2 aufgebaut werden.First, the Vergiessofen 1 is filled via the feed channel 2 with molten metal 3. After filling the Vergiessofens 1 of the feed channel 2 is closed by a gas-tight cover 14. The pressures p1, p2 and p3 correspond to the atmospheric pressure. For iron transport into the intermediate container, the chamber 16 is pressurized with a gaseous medium. The pressure p1 is greater than the pressures p2 and p3. The melt begins to flow via the channel 4 and the overflow wall 10 in the intermediate container 7. At the same time, over the tubular Approach 15 the inoculant 9 added. In the Fig. 1 the addition opening between the overflow wall 10 and the mold 5 is arranged. It is also conceivable to add the inoculant 9 in the region 17, ie in front of the overflow wall 10. Due to the flow of the molten metal 3, the inoculant 9 is homogeneously mixed with the molten metal 3. In order to fill the mold 5, the pressure p2 corresponding to the height ΔH must be established.

Nach der Formfüllung wird p2 soweit abgesenkt, dass die ausserhalb der Giessform befindliche Schmelze zurück in den Zwischenbehälter 7 fliessen kann.After filling the mold, p2 is lowered so far that the melt located outside the casting mold can flow back into the intermediate container 7.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Vergiessofencasting furnace
22
Zuführkanalfeed
33
Metallschmelzemolten metal
44
Kanalchannel
55
Giessformmold
66
Zuführungfeed
77
ZwischenhehälterZwischenhehälter
88th
ZugangAccess
99
Impfmittelinoculants
1010
ÜberlaufwandOverflow wall
1111
Öffnungopening
1212
entfälltdeleted
1313
Steigrohrriser
1414
Deckelcover
1515
Ansatzapproach
1616
Kammerchamber
1717
BereichArea
p1p1
Fülldruckfilling pressure
p2p2
Druck p3 DruckPressure p3 pressure
ΔHAH
Höheheight

Claims (6)

Vorrichtung zum Niederdruckgiessen von Metallschmelzen mit einem Vergiessofen (1), einem Zuführkanal (2) für die Metallschmelze (3), einem Kanal (4) in Richtung zur Giessform (5) und einer Zuführung (6) zur gasförmigen Druckbeaufschlagung, dadurch gekennzeichnet, dass zwischen der Giessform (5) und dem Kanal (4) ein Zwischenbehälter (7) angeordnet ist, wobei in dem Zwischenbehälter (7) ein Zugang (8) für die Zugabe eines Impfmittels (9) vorgesehen ist.Apparatus for low-pressure casting of metal melts with a casting furnace (1), a feed channel (2) for the molten metal (3), a channel (4) in the direction of the casting mold (5) and a feed (6) for gaseous pressurization, characterized in that between the mold (5) and the channel (4) an intermediate container (7) is arranged, wherein in the intermediate container (7) an access (8) for the addition of an inoculating agent (9) is provided. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass in dem Zwischenbehälter (7) eine Überlaufwand (10) angeordnet ist.Apparatus according to claim 1, characterized in that in the intermediate container (7) an overflow wall (10) is arranged. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Zugang (8) für das Impfmittel (9) vor der Überlaufwand (10) angeordnet ist.Apparatus according to claim 1 or 2, characterized in that the access (8) for the inoculation means (9) in front of the overflow wall (10) is arranged. Vorrichtung nach mindestens einem der Ansprüche 1, 2 oder 3, dadurch gekennzeichnet, dass der Zwischenbehälter (7) eine Öffnung (11) aufweist, wobei im Inneren des Zwischenbehälters an der Öffnung (11) ein Steigrohr (13) angeordnet ist und oberhalb der Öffnung (11) mit dieser direkt die Giessform (5) verbunden ist.Device according to at least one of claims 1, 2 or 3, characterized in that the intermediate container (7) has an opening (11), wherein in the interior of the intermediate container at the opening (11) a riser pipe (13) is arranged and above the opening (11) with this directly the mold (5) is connected. Verfahren zum Niederdruckgiessen von Metallschmelzen nach mindestens einem der vorherigen Vorrichtungsansprüchen, dadurch gekennzeichnet, dass das Impfmittel (9) in die sich in dem zwischen dem Vergiessofen (1) und der Giessform (5) angeordneten Zwischenbehälter (7) befindliche Metallschmelze (3) zugegeben wird.Method for low-pressure casting of metal melts according to at least one of the preceding device claims, characterized in that the inoculant (9) is added to the metal melt (3) located in the intermediate container (7) arranged between the casting furnace (1) and the casting mold (5) , Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass das Impfmittel (9) als Granulat zugegeben wird.A method according to claim 6, characterized in that the inoculant (9) is added as granules.
EP07120039A 2007-11-06 2007-11-06 Device and method for low pressure die casting of metal melts Withdrawn EP2060340A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP07120039A EP2060340A1 (en) 2007-11-06 2007-11-06 Device and method for low pressure die casting of metal melts
JP2010531542A JP2011502787A (en) 2007-11-06 2008-11-04 Apparatus and method for low pressure casting of a metal melt
PCT/EP2008/064895 WO2009059952A1 (en) 2007-11-06 2008-11-04 Device and method for low-pressure casting of metal melts
US12/741,127 US20100230066A1 (en) 2007-11-06 2008-11-04 Device and method for low-pressure casting of metal melts

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07120039A EP2060340A1 (en) 2007-11-06 2007-11-06 Device and method for low pressure die casting of metal melts

Publications (1)

Publication Number Publication Date
EP2060340A1 true EP2060340A1 (en) 2009-05-20

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EP07120039A Withdrawn EP2060340A1 (en) 2007-11-06 2007-11-06 Device and method for low pressure die casting of metal melts

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US (1) US20100230066A1 (en)
EP (1) EP2060340A1 (en)
JP (1) JP2011502787A (en)
WO (1) WO2009059952A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104841894A (en) * 2015-04-27 2015-08-19 乔治费歇尔汽车产品(昆山)有限公司 Fast tempering process method for air-pressure pouring furnace

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016009522A1 (en) * 2014-07-17 2016-01-21 株式会社トウネツ Two chamber molten metal holding furnace for low-pressure casting
CN107661971B (en) * 2016-07-31 2023-02-28 浙江跃岭股份有限公司 Liquefying device for low-pressure casting aluminum alloy hub
CN106392040A (en) * 2016-11-26 2017-02-15 中信戴卡股份有限公司 Communicating vessel type low-pressure casting holding furnace suitable for mold filling using mechanical pump
KR101962871B1 (en) * 2017-11-02 2019-03-28 삼영기계(주) Inoculator

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Publication number Priority date Publication date Assignee Title
GB1527054A (en) * 1977-05-11 1978-10-04 British Cast Iron Res Ass Producing nodular graphite iron
WO1980002659A1 (en) * 1979-06-07 1980-12-11 Mezger Ag Maschf Giesserei Automatic adjusting servo-controlled device for injecting molten metal during a casting operation
GB2069898A (en) * 1980-02-26 1981-09-03 Metal Research Corp Inoculation to a molten cast iron during pouring
JPS57134241A (en) * 1981-02-13 1982-08-19 Jidosha Imono Kk Method for addition of inoculant
US4431046A (en) * 1979-12-15 1984-02-14 Russ-Elektroofen Produktiongsgesellschaft Mbh & Co. Automated low-pressure casting mechanism and method
US4527608A (en) 1983-05-30 1985-07-09 Pont-A-Mousson S.A. Method for inoculating liquid metal cast under low pressure
US5758706A (en) * 1993-12-30 1998-06-02 Sintercast Ab Process control of compacted graphite iron production in pouring furnaces
DE10039877A1 (en) * 2000-05-23 2001-11-29 Wagner Heinrich Sinto Masch Casting process for molten metal comprises adding a treatment agent and/or inoculant to the casting material in the form of a material block or encapsulated granulate
JP2005095921A (en) 2003-09-24 2005-04-14 Ariake Serako Kk Casting method and casting apparatus

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Publication number Priority date Publication date Assignee Title
FR2340156A2 (en) * 1976-02-03 1977-09-02 Pechiney Aluminium LOW PRESSURE MOLDING PROCESS AND DEVICE
GB9323248D0 (en) * 1993-11-11 1994-01-05 Hi Tec Metals R & D Ltd A casting apparatus and method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1527054A (en) * 1977-05-11 1978-10-04 British Cast Iron Res Ass Producing nodular graphite iron
WO1980002659A1 (en) * 1979-06-07 1980-12-11 Mezger Ag Maschf Giesserei Automatic adjusting servo-controlled device for injecting molten metal during a casting operation
US4431046A (en) * 1979-12-15 1984-02-14 Russ-Elektroofen Produktiongsgesellschaft Mbh & Co. Automated low-pressure casting mechanism and method
GB2069898A (en) * 1980-02-26 1981-09-03 Metal Research Corp Inoculation to a molten cast iron during pouring
JPS57134241A (en) * 1981-02-13 1982-08-19 Jidosha Imono Kk Method for addition of inoculant
US4527608A (en) 1983-05-30 1985-07-09 Pont-A-Mousson S.A. Method for inoculating liquid metal cast under low pressure
US5758706A (en) * 1993-12-30 1998-06-02 Sintercast Ab Process control of compacted graphite iron production in pouring furnaces
DE10039877A1 (en) * 2000-05-23 2001-11-29 Wagner Heinrich Sinto Masch Casting process for molten metal comprises adding a treatment agent and/or inoculant to the casting material in the form of a material block or encapsulated granulate
JP2005095921A (en) 2003-09-24 2005-04-14 Ariake Serako Kk Casting method and casting apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104841894A (en) * 2015-04-27 2015-08-19 乔治费歇尔汽车产品(昆山)有限公司 Fast tempering process method for air-pressure pouring furnace

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WO2009059952A1 (en) 2009-05-14
US20100230066A1 (en) 2010-09-16
JP2011502787A (en) 2011-01-27

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