EP1057558B1 - Machine à coulée sous vide sous pression - Google Patents

Machine à coulée sous vide sous pression 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
Authority
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
Other languages
German (de)
English (en)
Other versions
EP1057558A1 (fr
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
Original Assignee
Mueller Weingarten 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 Mueller Weingarten AG filed Critical Mueller Weingarten AG
Publication of EP1057558A1 publication Critical patent/EP1057558A1/fr
Application granted granted Critical
Publication of EP1057558B1 publication Critical patent/EP1057558B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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.

Landscapes

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

Claims (5)

  1. Machine de coulée sous pression comportant un dispositif d'introduction de gaz protecteur, dans laquelle le dosage de la masse fondue a lieu par vide d'air depuis un four d'attente (5) vers une chambre de coulée (7) avec piston d'injection (8) en passant par une conduite d'aspiration (6), le piston d'injection (8) étant actionné par un groupe d'injection ou d'entraínement (10) par l'intermédiaire d'une tige de piston d'injection (9) et la conduite d'arrivée de gaz (14) pour le gaz protecteur étant agencée à l'extérieur de la chambre de coulée (7), et la conduite d'arrivée de gaz (14) pour le gaz protecteur étant agencée directement sur la zone d'extrémité, orientée vers le groupe d'injection (10), de la chambre de coulée (7) ou bien par l'intermédiaire d'un caisson d'aspiration (12) prévu à cet endroit,
    caractérisée en ce que, entre la tige de piston (9) du piston d'injection (8) et la chambre de coulée (7) ou entre la tige de piston (9) et le caisson d'aspiration (12), il est prévu un passage annulaire (13) d'extrémité, lequel s'ouvre lors de l'actionnement du piston de coulée (8) et établit une communication entre l'air environnant et la conduite d'aspiration (6), le gaz protecteur pouvant être aspiré depuis la conduite d'arrivée de gaz (14) à travers le passage annulaire (13).
  2. Machine de coulée sous pression selon la revendication 1,
    caractérisée en ce que la conduite d'arrivée de gaz (14) est constituée d'un tube ou de plusieurs tubes comportant des éléments d'extrémité en forme de buse ou d'un canal annulaire.
  3. Machine de coulée sous pression selon la revendication 1 ou 2,
    caractérisée en ce que la conduite d'arrivée de gaz (14) est constituée d'une seule conduite d'amenée.
  4. Machine de coulée sous pression selon la revendication 1,
    caractérisée en ce que l'introduction de gaz protecteur peut être commandée au moyen d'un système de temporisation.
  5. Machine de coulée sous pression selon la revendication 1,
    caractérisée en ce que l'instant et la durée de l'introduction de gaz protecteur peuvent être choisis librement.
EP00108213A 1999-06-02 2000-04-14 Machine à coulée sous vide sous pression Expired - Lifetime EP1057558B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19925148A DE19925148A1 (de) 1999-06-02 1999-06-02 Verhinderung der Oxidation der Schmelze bei einer nach einem Vakuumverfahren arbeitenden Druckgießmaschine
DE19925148 1999-06-02

Publications (2)

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

Family

ID=7909927

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00108213A Expired - Lifetime EP1057558B1 (fr) 1999-06-02 2000-04-14 Machine à coulée sous vide sous pression

Country Status (2)

Country Link
EP (1) EP1057558B1 (fr)
DE (2) DE19925148A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004057324A1 (de) * 2004-11-27 2006-06-01 Pfeiffer Vacuum Gmbh Vakuumdruckgussverfahren
DE102010046041A1 (de) 2009-09-22 2011-04-21 Ksm Castings Gmbh Vakuumdruckgussanlage und Verfahren zum Betrieb einer Vakuumdruckgussanlage
DE102019107325A1 (de) * 2019-03-21 2020-09-24 Engel Austria Gmbh Aufschmelzeinheit für eine Formgebungsmaschine und Formgebungsmaschine mit einer solchen

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 (de) * 1996-02-16 1997-08-21 Mueller Weingarten Maschf Vakuum-Druckgießmaschine

Also Published As

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

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