EP0790090A2 - Machine de coulée à dépression - Google Patents

Machine de coulée à dépression Download PDF

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Publication number
EP0790090A2
EP0790090A2 EP97102390A EP97102390A EP0790090A2 EP 0790090 A2 EP0790090 A2 EP 0790090A2 EP 97102390 A EP97102390 A EP 97102390A EP 97102390 A EP97102390 A EP 97102390A EP 0790090 A2 EP0790090 A2 EP 0790090A2
Authority
EP
European Patent Office
Prior art keywords
casting
mold
die
casting machine
holding furnace
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.)
Granted
Application number
EP97102390A
Other languages
German (de)
English (en)
Other versions
EP0790090A3 (fr
EP0790090B1 (fr
Inventor
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 EP0790090A2 publication Critical patent/EP0790090A2/fr
Publication of EP0790090A3 publication Critical patent/EP0790090A3/fr
Application granted granted Critical
Publication of EP0790090B1 publication Critical patent/EP0790090B1/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
    • B22D17/14—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
    • 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
    • B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
    • B22D17/2227—Die seals
    • 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 vacuum die casting machine according to the preamble of claim 1.
  • a die casting machine which works according to the so-called vacuum die casting method.
  • the molten metal is drawn from a holding furnace through a suction pipe into the casting chamber by means of negative pressure, the negative pressure being applied to the mold engraving of the mold via a vacuum system.
  • This patent also addresses the problem of sufficient degassing of the melt during the casting process.
  • the aim of the vacuum pressure casting method is to obtain an improvement in the casting quality by evacuating the die and extracting the reaction gases from the mold and the casting chamber.
  • the negative pressure also serves to transport the melt from the holding furnace into the casting chamber.
  • the casting mold consists of a movable and stationary mold half, the latter being generally connected to the casting chamber with casting pistons and the holding furnace leading via a suction pipe to the part of the casting chamber facing away from the casting mold.
  • the movable mold half is moved against the fixed mold half for a casting process, an elastic and temperature-resistant seal surrounding the mold cavity and sealing the mold halves against one another.
  • Such a sealing arrangement is shown for example in EP-A1-0 230 660, Fig. 1 with reference numeral 64.
  • the seal When the mold halves are moved together, the seal protrudes with a small distance of the order of 2 mm, for example, from the contact surfaces of the mold halves in order to act as a seal when the mold halves are pressed together.
  • the circumferential seal encompasses a surface area which, in conjunction with the protruding height of the seal, leads to a remarkable cavity for the inclusion of air. For example, if you take a medium-sized mold with a rectangular arrangement of seals of 700 x 900 mm and a protrusion of the seal over the flat surface of, for example, 2 mm, this leads to an air trap with a volume of 1.26 liters.
  • the invention has for its object to avoid the disadvantages described above and in particular to prevent an additional air supply to the holding oven by this effect.
  • the invention has the advantage over the known prior art that the air enclosed when the mold halves are moved together by the sealing arrangement cannot pass through the suction pipe into the holding furnace.
  • the gas recoil through this air cushion is kept away from the holding furnace at least until a pressure reduction in the casting mold or the casting chamber leads to a pressure equalization which prevents the gas or the enclosed air from flowing into the holding furnace.
  • This pressure reduction takes place e.g. through the evacuation valve connected to the atmosphere. In this way it is avoided that an additional gas application to the melt in the holding furnace and the associated disadvantages occur.
  • the conclusion or the closing of the holding furnace is achieved in a particularly simple manner in that the suction pipe for Holding furnace is separated from the mold cavity, which can preferably be done by means of the casting piston itself.
  • the casting piston is arranged in the casting chamber during the moving together of the mold halves in such a way that it is positioned in front of the mouth of the suction pipe, ie between the mold cavity and the mouth of the suction pipe.
  • the gas recoil cannot lead to air being applied to the melt in the holding furnace.
  • Casting sets have become known from various literature references which, after a casting process has been carried out, carry out an idle stroke of the casting piston within the casting chamber, for example in order to expel tinsel from the inside of the casting chamber and / or to apply spray oil lubrication to the inside wall of the casting chamber (see, for example, DE 43 16 927 A1).
  • This additional stroke during the return stroke can, according to the invention, serve to position the casting piston between the mouth of the suction pipe into the casting chamber and the mold cavity during the mold closing. In this case, the gas recoil cannot affect the holding furnace.
  • the pouring plunger is only finally retracted when the closing process has ended and, if appropriate, the pressure has been released via the evacuation device still connected to the atmosphere.
  • the suction pipe can also be used with other means, e.g. Cut off the gate valve or the like opposite the casting chamber so that this gas recoil does not affect the melt in the holding furnace when the mold halves are moved together.
  • other means e.g. Cut off the gate valve or the like opposite the casting chamber so that this gas recoil does not affect the melt in the holding furnace when the mold halves are moved together.
  • the casting piston By arranging the casting piston in the front position when the mold halves are brought together, the interior of the casting chamber is closed off from the mold cavity. After the mold halves have been brought together, the casting piston is pulled backwards in the direction of the intake pipe, which is a kind of additional evacuation or
  • Fig. 1 of a die casting machine 1 is only indicated, the fixed platen 2 with attached fixed mold half 3, which cooperates with the movable mold half 4.
  • the mold engraving or the mold cavity 5, which is to be filled with molten metal, is located between the fixed 3 and the movable mold half 4.
  • a casting chamber 6 with a casting piston 7 is provided, into which the molten metal 8 is drawn in from a holding furnace 10 via an intake pipe 9.
  • the molten metal is sucked out of the holding furnace 10 or a holding device by applying a vacuum.
  • a vacuum valve 12 with a vacuum connection line 13, which leads to an evacuation device 11, not shown.
  • the mold cavity 5 is connected to the evacuation device 11 via a suction channel 14, the negative pressure being applied in the mold engraving 15 of the casting mold consisting of the mold halves 3, 4.
  • the two mold halves 3, 4 are sealed by a circumferential elastic and temperature-resistant seal 16 which can be designed, for example, as a silicone cord.
  • the sealing arrangement 16 spans, for example, the mold cavity 5 in a rectangular or square shape, the surface sealed thereby being formed by the height h 1 and the width b 1 , not shown, leading into the plane of the drawing in FIG. 1.
  • a surface H 1 xb 1 700 x 900 mm be.
  • the seal 16 is inserted in a groove 17 of the fixed mold half 3 and it has a diameter d 1 in the unloaded state.
  • the seal 16 projects in the unloaded state by an amount l 1 relative to the end face 18 of the mold half 3.
  • the seal 16 just touches the end face 19 of the mold half 4 when the two mold halves 3, 4 move together.
  • the increased volume V 1 from the gap with the width l 1 can be compensated for by increasing the volume of the casting chamber 6 and / or by suction using the evacuation device 11 or by releasing the vacuum valve to the atmosphere.
  • the chamber volume 22 of the casting chamber increases.
  • the pressure can be reduced and an underpressure can be generated in the casting chamber and / or in the mold cavity 5.
  • the starting position of the casting piston 7 in its forward position is therefore optimized as a function of the other parameters and in particular also the volume of the mold cavity 5. If the volume V 2 of the mold cavity 5 is very small due to the cast part to be produced, the casting piston must rather be arranged in a rear position (to the right in FIG.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP97102390A 1996-02-16 1997-02-14 Machine de coulée à dépression Expired - Lifetime EP0790090B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19605727A DE19605727A1 (de) 1996-02-16 1996-02-16 Vakuum-Druckgießmaschine
DE19605727 1996-02-16

Publications (3)

Publication Number Publication Date
EP0790090A2 true EP0790090A2 (fr) 1997-08-20
EP0790090A3 EP0790090A3 (fr) 1998-07-08
EP0790090B1 EP0790090B1 (fr) 2000-06-28

Family

ID=7785557

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97102390A Expired - Lifetime EP0790090B1 (fr) 1996-02-16 1997-02-14 Machine de coulée à dépression

Country Status (2)

Country Link
EP (1) EP0790090B1 (fr)
DE (2) DE19605727A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901853A1 (fr) * 1997-09-12 1999-03-17 Howmet Research Corporation Coulée sous pression à vide poussé
EP0985473A1 (fr) * 1998-09-09 2000-03-15 Alusuisse Bayrisches Druckguss-Werk GmbH & Co. KG Machine à couler sous pression et procédé pour la fabrication de pièces coulées sous pression
EP1057558A1 (fr) * 1999-06-02 2000-12-06 Müller Weingarten AG Prévention de l'oxydation du métal liquide dans une machine de coulée à dépression
EP1358957A3 (fr) * 2002-04-17 2004-03-03 Toshihara Kanagata Kogyo Co., Ltd. Dispositif de moulage
EP2239070A1 (fr) * 2009-04-06 2010-10-13 Fondarex S.A. Dispositif de coulée
WO2012100789A1 (fr) * 2011-01-28 2012-08-02 Idra S.R.L. Machine à coulée sous pression sous vide

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952116B4 (de) * 1999-10-29 2006-09-28 Audi Ag Verwendung eines Metall-Druckgussstückes, hergestellt durch Vakuumgießen
DE10054870B4 (de) * 2000-11-06 2008-04-24 Bühler Druckguss AG Druckgiessmaschine
DE10135724B4 (de) * 2001-07-26 2005-07-21 Müller Weingarten AG Abdichtung von Formen
DE102004057324A1 (de) * 2004-11-27 2006-06-01 Pfeiffer Vacuum Gmbh Vakuumdruckgussverfahren
DE102016123495A1 (de) 2016-12-05 2018-06-07 Schuler Pressen Gmbh Werkzeug zum Gießen und/oder Umformen eines Bauteils, Gießvorrichtung, Presse und Verfahren zur Spaltkompensation
CN114603100B (zh) * 2022-02-17 2022-11-08 湖南大学 一种高强高韧铝合金减震塔高压真空压铸方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051310B1 (fr) 1980-11-03 1985-01-23 Maschinenfabrik Müller-Weingarten AG Appareil de moulage par injection pour la coulée de pièces
EP0230660A1 (fr) 1985-12-27 1987-08-05 Nippondenso Co., Ltd. Dispositif de moulage par injection
DE4316927A1 (de) 1993-05-19 1994-11-24 Mueller Weingarten Maschf Gießgarnitur für eine Druckgießmaschine

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6061158A (ja) * 1983-09-15 1985-04-08 Toyota Motor Corp 吸引鋳造装置
EP0241426B1 (fr) * 1986-04-11 1989-07-12 Schweizerische Aluminium Ag Procédé et dispositif de coulée sous pression
EP0559920B1 (fr) * 1991-10-25 1998-07-22 Toyota Jidosha Kabushiki Kaisha Dispositif de coulee sous vide
DE4310755C2 (de) * 1993-04-01 1996-04-25 Druckgusswerk Moessner Gmbh We Druckgießvorrichtung

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0051310B1 (fr) 1980-11-03 1985-01-23 Maschinenfabrik Müller-Weingarten AG Appareil de moulage par injection pour la coulée de pièces
EP0230660A1 (fr) 1985-12-27 1987-08-05 Nippondenso Co., Ltd. Dispositif de moulage par injection
DE4316927A1 (de) 1993-05-19 1994-11-24 Mueller Weingarten Maschf Gießgarnitur für eine Druckgießmaschine

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0901853A1 (fr) * 1997-09-12 1999-03-17 Howmet Research Corporation Coulée sous pression à vide poussé
US6070643A (en) * 1997-09-12 2000-06-06 Howmet Research Corporation High vacuum die casting
EP0985473A1 (fr) * 1998-09-09 2000-03-15 Alusuisse Bayrisches Druckguss-Werk GmbH & Co. KG Machine à couler sous pression et procédé pour la fabrication de pièces coulées sous pression
EP1057558A1 (fr) * 1999-06-02 2000-12-06 Müller Weingarten AG Prévention de l'oxydation du métal liquide dans une machine de coulée à dépression
EP1358957A3 (fr) * 2002-04-17 2004-03-03 Toshihara Kanagata Kogyo Co., Ltd. Dispositif de moulage
US7011137B2 (en) 2002-04-17 2006-03-14 Toshihara Kanagata Kogyo Co., Ltd Molding device
EP2239070A1 (fr) * 2009-04-06 2010-10-13 Fondarex S.A. Dispositif de coulée
CH700743A1 (de) * 2009-04-06 2010-10-15 Fondarex Sa Entlüftungseinrichtung für Giessvorrichtungen.
US8336600B2 (en) 2009-04-06 2012-12-25 Fondarex Sa Casting device
WO2012100789A1 (fr) * 2011-01-28 2012-08-02 Idra S.R.L. Machine à coulée sous pression sous vide
CN103547394A (zh) * 2011-01-28 2014-01-29 艾德拉有限公司 真空压铸机
CN103547394B (zh) * 2011-01-28 2015-11-25 艾德拉有限公司 真空压铸机
US9370822B2 (en) 2011-01-28 2016-06-21 Idra S.R.L. Vacuum die-casting machine

Also Published As

Publication number Publication date
EP0790090A3 (fr) 1998-07-08
DE19605727A1 (de) 1997-08-21
EP0790090B1 (fr) 2000-06-28
DE59701920D1 (de) 2000-08-03

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