EP1057558B1 - Vacuum die pressure casting machine - Google Patents

Vacuum die pressure casting machine Download PDF

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Publication number
EP1057558B1
EP1057558B1 EP00108213A EP00108213A EP1057558B1 EP 1057558 B1 EP1057558 B1 EP 1057558B1 EP 00108213 A EP00108213 A EP 00108213A EP 00108213 A EP00108213 A EP 00108213A EP 1057558 B1 EP1057558 B1 EP 1057558B1
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EP
European Patent Office
Prior art keywords
casting
casting machine
plunger
shielding gas
gas supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00108213A
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German (de)
French (fr)
Other versions
EP1057558A1 (en
Inventor
Friedrich Georg Dipl.-Ing. Stummer
Wilfried Schwab
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.)
Mueller Weingarten AG
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Mueller Weingarten AG
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Filing date
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Publication of EP1057558A1 publication Critical patent/EP1057558A1/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
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/30—Accessories for supplying molten metal, e.g. in rations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14—Machines with evacuated die cavity
    • 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
    • B22D18/06—Vacuum casting, i.e. making use of vacuum to fill the mould

Definitions

  • the invention relates to a die casting machine in the using vacuum the metal dosage over a Suction pipe takes place and the sucked metal from easily oxidizable alloys.
  • the procedure is thereby characterized in that the melt dosage by applying a vacuum via a suction pipe in the melt pool in the filling chamber takes place. After dosing in the The casting piston pushes the melt towards the casting chamber Die. Due to the movement of the casting piston through the resulting free annulus air from the Ambient atmosphere sucked in and also penetrates into the intake manifold on. The oxygen in the air leads to Oxidation of the melt, especially when processing Magnesium or other easily oxidizable melts.
  • antioxidant gases are used. So is from the EP 0 462 218 B1 known protective gas in the suction box of the Initiate die casting machine. For this purpose in addition to the vacuum line, another line for Shielding gas introduction, installed. This chosen The arrangement requires a very precise coordination of the Switching times for the termination of the vacuum control and the Introduction of the protective gas. If this is not guaranteed and the pressurized protective gas would e.g. too early switched on, there is a risk that this of the still controlled evacuation device is sucked. For this The reason for EP 0 462 218 is a special control device provided, including the required Signal generators of this control circuit are complex must be designed.
  • the invention has for its object in a die casting machine using the Vacuum die casting process and especially during processing of easily oxidizable melts an antioxidant gas like that to supply that with the simplest cultivation and low High functionality is guaranteed.
  • the task is based on a die casting machine with a protective gas supply the preamble of claim 1, by the characterizing Features of claim 1 solved.
  • the object is achieved in that a Inlet for the protective gas at the rear end of the casting chamber or the suction box is attached and the protective gas immediately before the start of the piston movement, during or after passing the metering opening in the casting chamber the annular gap between the casting chamber and the casting piston rod is blown in.
  • a protective gas which is specifically heavier than air, e.g. SF6. This protective gas is exploited by the suction effect the decreasing vacuum and the falling of the Melting level is sucked into the suction pipe and fills the desired area. Oxidation in the intake manifold and / or the This reliably prevents the melt surface.
  • Another advantage of the invention is that proposed arrangement of the inflow of protective gas is striking is verifiable.
  • Figure 1 shows the injection system 1 of a vacuum die casting machine which via anchor 2 with the fixed Platen 3 is connected. Between firmer Platen 3 and stand part 4 of the injection system 1 the holding furnace 5 is arranged for the liquid melt. The below the melting surface in the holding furnace 5 immersed suction pipe is designated 6. The top end of suction tube 6 is connected to the casting chamber 7. In the Casting chamber 7 is casting piston 8, which with Casting piston rod 9 is connected. Casting piston rod 9 is with the actual casting unit 10 connected.
  • FIG. 2 An enlarged illustration of a detail of the die casting machine according to the invention in two different embodiments shows the Figures 2 and 3.
  • a casting piston 8 in a position corresponding to the passage of the suction opening 11 of the Intake pipe 6 corresponds.
  • a free annular gap 13 between Piston rod 9 and suction box 12 were created.
  • About the Lead 14 can the antioxidant gas to the intake manifold 6 and so that the melt can be fed.
  • a valve not shown is opened and depending on the desired duration can be closed using a timer.
  • the start of the gas supply is freely selectable and can e.g. by starting the movement of the casting piston 8 to be triggered. Because at this point the diameter of the pouring piston still in the sealing position in the suction box 12 is an undesirable air access locked out.
  • Figure 3 differs from Figure 2 only in that that no suction box is attached.
  • the antioxidant gas is directly via feed line 14 in the filling chamber 7 and thus introduced into the intake manifold 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Details (AREA)
  • Vacuum Packaging (AREA)

Description

Die Erfindung bezieht sich auf eine Druckgießmaschine bei der unter Verwendung von Vakuum die Metalldosierung über ein Saugrohr stattfindet und das angesaugte Metall aus leicht oxidierbaren Legierungen besteht.The invention relates to a die casting machine in the using vacuum the metal dosage over a Suction pipe takes place and the sucked metal from easily oxidizable alloys.

Zur Vermeidung der Oxidation wird die Zuführung von Schutzgas in einfachster und funktionssicherer Form vorgeschlagen.To avoid oxidation, the supply of protective gas proposed in the simplest and functionally reliable form.

Stand der Technik:State of the art:

Im Vakuum-Druckgießverfahren werden insbesondere hochwertige Bauteile hergestellt. An die Qualität dieser Teile werden hohe Ansprüche gestellt, unter anderem sind Oxide und Verunreinigung zu vermeiden. Das Verfahren ist dadurch gekennzeichnet, daß die Schmelzdosierung durch das Anlegen eines Vakuums über ein im Schmelzbad befindliches Saugrohr in die Füllkammer erfolgt. Nach erfolgter Dosierung in der Gießkammer schiebt der Gießkolben die Schmelze in Richtung Druckgießform. Aufgrund der Bewegung des Gießkolben wird durch den entstehenden freien Ringraum Luft aus der Umgebungsatmosphäre angesaugt und dringt auch in das Saugrohr ein. Der in der Luft enthaltene Sauerstoff führt zur Oxidation der Schmelze, insbesondere bei Verarbeitung von Magnesium oder anderen leicht oxidierbaren Schmelzen. In dem Saugrohr bilden sich Oxide, sog. "Krätze", die bei jedem Gießzyklus anwachsen und sich im Saugrohr aufbauen. Der Gießprozeß wird negativ beeinflußt und als Folge wird die Gußteilqualität durch Oxideinschlüsse erheblich gemindert und auch eine exakte Dosierung ist nicht mehr möglich.In the vacuum die casting process in particular high quality Components manufactured. The quality of these parts will be high demands, among others are oxides and To avoid contamination. The procedure is thereby characterized in that the melt dosage by applying a vacuum via a suction pipe in the melt pool in the filling chamber takes place. After dosing in the The casting piston pushes the melt towards the casting chamber Die. Due to the movement of the casting piston through the resulting free annulus air from the Ambient atmosphere sucked in and also penetrates into the intake manifold on. The oxygen in the air leads to Oxidation of the melt, especially when processing Magnesium or other easily oxidizable melts. By doing Intake pipe form oxides, so-called "scabies", with each Grow the casting cycle and build up in the intake manifold. The Casting process is adversely affected and as a result the Cast part quality significantly reduced by oxide inclusions and exact dosing is also no longer possible.

Zur Vermeidung der Oxidation durch unerwünschten Lufteintritt werden Antioxidationsgase verwendet. So ist aus der EP 0 462 218 B1 bekannt Schutzgas in den Absaugkasten der Druckgießmaschine einzuleiten. Zu diesem Zweck wird zusätzlich zu der Vakuumleitung eine weitere Leitung, zur Einleitung des Schutzgases, installiert. Diese gewählte Anordnung erfordert eine sehr exakte Abstimmung der Schaltzeiten für die Beendigung der Vakuumansteuerung und der Einleitung des Schutzgases. Ist dieses nicht gewährleistet und das unter Druck stehende Schutzgas würde z.B. zu früh zugeschaltet, so besteht die Gefahr, daß dieses von der noch angesteuerten Evakuiereinrichtung angesaugt wird. Aus diesem Grunde ist bei der EP 0 462 218 ein spezielles Steuergerät vorgesehen, wodurch einschließlich der erforderlichen Signalgeber dieser Steuer- bzw. Regelkreis aufwendig gestaltet werden muß. Ein weiterer Nachteil besteht in der Tatsache, daß diese Lösung nur im Falle eines angebauten Ansaugkasten realisiert werden kann. Ist aus räumlichen oder funktionellen Gründen der Einsatz eines Ansaugkastens nicht möglich, so bietet die EP 0 462 218 keine Lösung an. Auch eine Sichtkontrolle der Schutzgasfunktion ist bei der vorgeschlagenen Anordnung nicht möglich.To avoid oxidation due to undesired air entry antioxidant gases are used. So is from the EP 0 462 218 B1 known protective gas in the suction box of the Initiate die casting machine. For this purpose in addition to the vacuum line, another line for Shielding gas introduction, installed. This chosen The arrangement requires a very precise coordination of the Switching times for the termination of the vacuum control and the Introduction of the protective gas. If this is not guaranteed and the pressurized protective gas would e.g. too early switched on, there is a risk that this of the still controlled evacuation device is sucked. For this The reason for EP 0 462 218 is a special control device provided, including the required Signal generators of this control circuit are complex must be designed. Another disadvantage is that The fact that this solution is only in the case of an attached Intake box can be realized. Is from spatial or functional reasons the use of a suction box is not possible, EP 0 462 218 offers no solution. Also a visual inspection of the protective gas function is at the proposed arrangement not possible.

Aufgabe und Vorteil der Erfindung:Object and advantage of the invention:

Der Erfindung liegt die Aufgabe zugrunde, bei einer Druckgießmaschine unter Anwendung des Vakuum-Druckgießverfahrens und insbesondere bei Verarbeitung von leicht oxidierbaren Schmelzen ein Antioxidationsgas so zuzuführen, daß bei einfachstem Anbau und geringem Regelaufwand eine hohe Funktionalität gewährleistet ist. Die Aufgabe wird ausgehend von eine Druckgießmaschine mit einer Schutzgaszuführung nach dem Oberbegriff des Anspruch 1, durch die kennzeichnenden Merkmale des Anspruch 1 gelöst. In den Unteransprüchen werden vorteilhafte und zweckmäßige Weiterbildungen der Druckgießmaschine mit der Schutzgaszuführung vorgeschlagen.The invention has for its object in a die casting machine using the Vacuum die casting process and especially during processing of easily oxidizable melts an antioxidant gas like that to supply that with the simplest cultivation and low High functionality is guaranteed. The task is based on a die casting machine with a protective gas supply the preamble of claim 1, by the characterizing Features of claim 1 solved. In the subclaims advantageous and expedient developments of the die casting machine with the Shielding gas supply proposed.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß eine Zuleitung für das Schutzgas am hinteren Ende der Gießkammer oder des Absaugkastens angebracht wird und das Schutzgas unmittelbar vor dem Beginn der Kolbenbewegung, während oder nach dem Überfahren der Dosieröffnung in der Gießkammer über den Ringspalt zwischen Gießkammer und Gießkolbenstange eingeblasen wird. Dabei ist es vorteilhaft ein Schutzgas zu verwenden, welches spezifisch schwerer als Luft ist, wie z.B. SF6. Dieses Schutzgas wird unter Ausnutzung der Ansaugwirkung des sich abbauenden Vakuums und des Abfallens des Schmelzspiegels in das Saugrohr eingesaugt und füllt den gewünschten Bereich aus. Eine Oxidation im Saugrohr und/oder der Schmelzenoberfläche wird damit sicher verhindert. Zur Reduzierung des Schutzgasverbrauchs kann die Zuführung des Schutzgases kurz vor oder während des Beginns der Bewegung des Gießkolbens geöffnet und nach wenigen Sekunden, wenn genügend Schutzgas zugeführt ist, wieder geschlossen werden. Hierdurch ist der gesamte Ablauf über ein einfaches Zeitregelglied regelbar.According to the invention the object is achieved in that a Inlet for the protective gas at the rear end of the casting chamber or the suction box is attached and the protective gas immediately before the start of the piston movement, during or after passing the metering opening in the casting chamber the annular gap between the casting chamber and the casting piston rod is blown in. It is advantageous to use a protective gas which is specifically heavier than air, e.g. SF6. This protective gas is exploited by the suction effect the decreasing vacuum and the falling of the Melting level is sucked into the suction pipe and fills the desired area. Oxidation in the intake manifold and / or the This reliably prevents the melt surface. to Reduction of the protective gas consumption can lead to the supply of Shielding gas just before or during the start of the movement of the Pouring piston opened and after a few seconds if enough Shielding gas is supplied to be closed again. hereby is the entire process via a simple time control element adjustable.

Ein weiterer Vorteil der Erfindung ist, daß durch die vorgeschlagene Anordnung der Zufluß von Schutzgas augenfällig überprüfbar ist.Another advantage of the invention is that proposed arrangement of the inflow of protective gas is striking is verifiable.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung der 3 Figuren.Further details and advantages of the invention emerge from the following description of the 3 figures.

Diese Figuren zeigen:

Figur 1:
Einspritzsystem einer Vakuum-Druckgießmaschine
Figur 2:
Einzelheit der Gießkammer mit Absaugkasten
Figur 3:
Einzelheit der Gießkammer ohne Absaugkasten
These figures show:
Figure 1:
Injection system of a vacuum die casting machine
Figure 2:
Detail of the casting chamber with suction box
Figure 3:
Detail of the casting chamber without suction box

Beschreibung:Description:

Figur 1 zeigt das Einspritzsystem 1 einer Vakuum-Druckgießmaschine welches über Anker 2 mit der festen Aufspannplatte 3 verbunden ist. Zwischen fester Aufspannplatte 3 und Ständerteil 4 des Einspritzsystem 1 ist der Warmhalteofen 5 für die flüssige Schmelze angeordnet. Das unterhalb der Schmelzoberfläche in den Warmhalteofen 5 eintauchende Saugrohr ist mit 6 bezeichnet. Das obere Ende von Saugrohr 6 ist mit Gießkammer 7 verbunden. In der Gießkammer 7 befindet sich Gießkolben 8, der mit Gießkolbenstange 9 verbunden ist. Gießkolbenstange 9 ist mit dem eigentlichen Gießaggregat 10 verbunden.Figure 1 shows the injection system 1 of a vacuum die casting machine which via anchor 2 with the fixed Platen 3 is connected. Between firmer Platen 3 and stand part 4 of the injection system 1 the holding furnace 5 is arranged for the liquid melt. The below the melting surface in the holding furnace 5 immersed suction pipe is designated 6. The top end of suction tube 6 is connected to the casting chamber 7. In the Casting chamber 7 is casting piston 8, which with Casting piston rod 9 is connected. Casting piston rod 9 is with the actual casting unit 10 connected.

Eine vergrößerte Darstellung eines Details der erfindungsgemäßen Druckgießmaschine in zwei verschiedenen Ausführungsformen zeigen die Figuren 2 und 3. In der Gießkammer 7 ist ein Gießkolben 8 in einer Position, die dem Überfahren der Ansaugöffnung 11 des Ansaugrohres 6 entspricht. Durch das Verfahren aus der Endlage ist somit ein freier Ringspalt 13 zwischen Kolbenstange 9 und Absaugkasten 12 entstanden. Über die Zuleitung 14 kann das Antioxidationsgas zum Saugrohr 6 und damit der Schmelze zugeführt werden. Zu diesem Zwecke muß nur ein nicht näher gezeigtes Ventil geöffnet und je nach gewünschter Zeitdauer über ein Zeitglied geschlossen werden. Der Beginn der Gaszuführung ist frei wählbar und kann z.B. durch den Start der Verfahrbewegung des Gießkolbens 8 ausgelöst werden. Da sich zu diesem Zeitpunkt der Durchmesser des Gießkolben noch in der Dichtungsposition im Absaugkasten 12 befindet, ist ein unerwünschter Luftzutritt ausgeschlossen. An enlarged illustration of a detail of the die casting machine according to the invention in two different embodiments shows the Figures 2 and 3. In the casting chamber 7 is a casting piston 8 in a position corresponding to the passage of the suction opening 11 of the Intake pipe 6 corresponds. By the procedure from the End position is thus a free annular gap 13 between Piston rod 9 and suction box 12 were created. About the Lead 14 can the antioxidant gas to the intake manifold 6 and so that the melt can be fed. For this purpose only a valve not shown is opened and depending on the desired duration can be closed using a timer. The start of the gas supply is freely selectable and can e.g. by starting the movement of the casting piston 8 to be triggered. Because at this point the diameter of the pouring piston still in the sealing position in the suction box 12 is an undesirable air access locked out.

Die Figur 3 unterscheidet sich von der Figur 2 nur dadurch, daß kein Absaugkasten angebaut ist. Das Antioxidationsgas wird direkt über Zuleitung 14 in die Füllkammer 7 und damit in das Saugrohr 6 eingeleitet.Figure 3 differs from Figure 2 only in that that no suction box is attached. The antioxidant gas is directly via feed line 14 in the filling chamber 7 and thus introduced into the intake manifold 6.

Die Erfindung ist nicht auf das beschriebene und dargestellte Ausführungsbeispiel beschränkt. Sie umfaßt auch alle fachmännischen Ausgestaltungen im Rahmen des geltenden Anspruches 1.The invention is not based on that described and illustrated embodiment limited. It also includes all professional designs within the scope of the applicable Claim 1.

So kann z.B. das Rohr 14 aus mehreren im Endbereich düsenartig ausgebildeten Rohrstücken mit gemeinsamer Versorgungsleitung bestehen, wobei eine ringförmige Anordnung eine vorteilhafte Ausführungsform darstellt. Weiterhin kann die Schutzgaszuführung über einen Ringkanal mit entsprechenden Austrittsöffnungen erfolgen, wobei der Ringkanal aus einem oder mehreren Segmentstücken bestehen kann.

1
Einspritzsystem
2
Anker
3
Aufspannplatte
4
Ständerteil
5
Warmhalteofen
6
Saugrohr
7
Gießkammer
8
Gießkolben
9
Gießkolbenstange
10
Gießaggregat
11
Ansaugöffnung
12
Absaugkasten
13
Ringspalt
14
Gaszuleitung
For example, the tube 14 can consist of a plurality of tube pieces with a common supply line, which are designed like nozzles in the end region, an annular arrangement being an advantageous embodiment. Furthermore, the protective gas can be supplied via an annular channel with corresponding outlet openings, wherein the annular channel can consist of one or more segment pieces.
1
injection
2
anchor
3
platen
4
stand Body
5
Holding furnace
6
suction tube
7
casting chamber
8th
casting plunger
9
Gießkolbenstange
10
casting unit
11
suction
12
suction
13
annular gap
14
gas supply

Claims (5)

  1. A pressure die-casting machine having a device for the introduction of shielding gas, with which the metering of the molten material takes place by means of evacuation from a holding furnace (5) via a suction pipe (6) to a casting chamber (7) with a casting plunger (8), wherein the plunger (8) is actuated via a plunger rod (9) of a casting or drive unit (10) and the gas supply pipe (14) for the shielding gas is disposed outside the casting chamber (7) and wherein the gas supply pipe (14) for the shielding gas is disposed either at the end region of the casting chamber (7) closer to the casting unit (10) directly or via a suction box (12) provided there,
    characterised in that an end annular gap (13) is provided between the plunger rod (9) of the plunger (8) and the casting chamber (7) or between the plunger rod (9) and the suction box (12) and opens upon the actuation of the plunger (8) and produces a connection between the ambient air and the suction pipe (6), whereby the shielding gas can be blown out of the gas supply pipe (14) through the annular gap (13).
  2. A pressure die-casting machine according to Claim 1,
    characterised in that the gas supply pipe (14) consists of a pipe or several pipes having nozzle-type end pieces or a ring channel.
  3. A pressure die-casting machine according to Claims 1 and 2,
    characterised in that the gas supply pipe (14) consists of just one feed pipe.
  4. A pressure die-casting machine according to Claim 1,
    characterised in that the introduction of shielding gas can be controlled by means of a timing element.
  5. A pressure die-casting machine according to Claim 1,
    characterised in that the time point and the time duration of the introduction of shielding gas can be freely chosen.
EP00108213A 1999-06-02 2000-04-14 Vacuum die pressure casting machine Expired - Lifetime EP1057558B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19925148A DE19925148A1 (en) 1999-06-02 1999-06-02 Prevention of melt oxidation in a vacuum die-casting machine
DE19925148 1999-06-02

Publications (2)

Publication Number Publication Date
EP1057558A1 EP1057558A1 (en) 2000-12-06
EP1057558B1 true EP1057558B1 (en) 2004-12-01

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Application Number Title Priority Date Filing Date
EP00108213A Expired - Lifetime EP1057558B1 (en) 1999-06-02 2000-04-14 Vacuum die pressure casting machine

Country Status (2)

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EP (1) EP1057558B1 (en)
DE (2) DE19925148A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004057324A1 (en) * 2004-11-27 2006-06-01 Pfeiffer Vacuum Gmbh Vacuum die casting process
EP2480357B1 (en) 2009-09-22 2020-04-15 KSM Castings Group GmbH Vacuum die casting device and method for oprating a vacuum die casting device
DE102019107325A1 (en) * 2019-03-21 2020-09-24 Engel Austria Gmbh Melting unit for a molding machine and molding machine with such

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076344A (en) * 1989-03-07 1991-12-31 Aluminum Company Of America Die-casting process and equipment
US5263531A (en) * 1991-09-23 1993-11-23 Gibbs Die Casting Aluminum Corporation Casting process using low melting point core material
DE19605727A1 (en) * 1996-02-16 1997-08-21 Mueller Weingarten Maschf Vacuum die casting machine

Also Published As

Publication number Publication date
DE19925148A1 (en) 2000-12-07
EP1057558A1 (en) 2000-12-06
DE50008799D1 (en) 2005-01-05

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