EP1832362B1 - Installation de coulée sous pression à vide et procédé de de mise en oeuvre - Google Patents

Installation de coulée sous pression à vide et procédé de de mise en oeuvre Download PDF

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Publication number
EP1832362B1
EP1832362B1 EP07004292A EP07004292A EP1832362B1 EP 1832362 B1 EP1832362 B1 EP 1832362B1 EP 07004292 A EP07004292 A EP 07004292A EP 07004292 A EP07004292 A EP 07004292A EP 1832362 B1 EP1832362 B1 EP 1832362B1
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EP
European Patent Office
Prior art keywords
vacuum
casting
chamber
pressure
mold
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.)
Active
Application number
EP07004292A
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German (de)
English (en)
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EP1832362A1 (fr
Inventor
Hedwig Lismont
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.)
Pfeiffer Vacuum GmbH
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Pfeiffer Vacuum GmbH
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Application filed by Pfeiffer Vacuum GmbH filed Critical Pfeiffer Vacuum GmbH
Priority to PL07004292T priority Critical patent/PL1832362T3/pl
Publication of EP1832362A1 publication Critical patent/EP1832362A1/fr
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Publication of EP1832362B1 publication Critical patent/EP1832362B1/fr
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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
    • B22D17/14—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
    • B22D17/32—Controlling equipment

Definitions

  • the invention relates to a vacuum die casting system with a mold, a casting chamber, a piston, a vent valve, a casting plant control and a vacuum system. It also relates to a method of operating a vacuum die casting machine, in particular for vacuum die casting of metals and their alloys, the vacuum die casting machine having a mold, a casting chamber and a piston.
  • Die casting under vacuum has been used for some time in the production of moldings of metals and metal alloys, especially for alloys of metals Al, Mg, Zn and Cu.
  • die casting under vacuum a higher material quality of the parts is achieved because less air and gases are trapped in the material.
  • vacuum can hardly be dispensed with.
  • die casting under vacuum is not only possible with the use of liquid metal alloys, but can also be used in derived special processes.
  • Processes in which partially liquid or doughy material is used as casting material (commonly referred to as Thixo- or Rheo-casting), processes in which the casting material from a combination of materials (composite) of liquid or semi-liquid metals and non-metallic Inclusions (MMC), processes in which a preform is infiltrated with liquid material, and processes in which non-metallic materials are similarly cast.
  • vacuum die casting can be combined with the use of protective or reaction gases.
  • evacuation takes place during the metal dosing process, as is the case with the process, for example EP-OS 0 051 310 ,
  • connection between the vacuum vessel or the vacuum system and the vacuum mold is mainly made through a mold-installed vent valve.
  • the EP-A1-0 600 324 relates to a die casting plant, is sucked in the molten metal by means of negative pressure in the casting chamber.
  • a control unit is supplied with pressure values determined by a pressure sensor.
  • the measuring points are located on the vacuum tank and the mold.
  • the casting chamber is not included in the consideration.
  • the JP 57 072766 A relates to a die casting plant in which molten metal is poured through an opening in the casting chamber and therefore first exposed to air at atmospheric pressure. In a single-stage vacuum process, the air is extracted via the casting chamber and mold. The necessary valves are controlled by switches whose switching state is determined by the piston position. A measurement of the pressure values is not described.
  • the object of the invention is therefore to improve the process for the production of Vakuumdruckgusstcilcn, so that the quality of the parts increases.
  • the vacuum die casting plant according to the first claim makes it possible to determine important vacuum technical parameters of the vacuum pressure casting plant.
  • vacuum meters are provided on the buffer tank and on the supply line between the vent valve and buffer tank, which with the Vacuum system control related. This makes it possible to monitor the parameters in the vacuum system control before and during the casting process and to obtain a measure of the component quality by the values determined.
  • An advantage of the method according to claim 2 is that with the simple method of pressure rise measurement in a buffer tank a vacuum technical Parameter of the system can be determined.
  • the knowledge of the parameters allows to determine the vacuum reached in the mold cavity.
  • Advantages are achieved if the leak rate and the conductivity of the system are determined as vacuum parameters.
  • the leak rate allows conclusions to be drawn as to how quickly a vacuum reached in the mold rises due to the penetration of gas.
  • the conductance is a measure of the amount of gas that can be moved per unit of time through the shape and feed line, thus allowing the conclusion to be drawn about the achievable vacuum.
  • FIG. 1 shows a schematic diagram of a vacuum pressure casting system with vacuum system and control.
  • the vacuum die casting apparatus has a shape composed of two mold halves 1a and 1b.
  • the interior of the mold is connected to the casting chamber 2, which is filled with molten metal for the casting process. This is filled through the filling opening 23 and pressed by the piston 3 in the mold cavity.
  • the gas present in the mold cavity is sucked off via the venting valve 4.
  • the solidifying metal rises up to this vent valve.
  • the piston 3 is moved by a piston moving device, i. moved in the casting chamber 2.
  • the control is carried out by the casting plant control 8, which can also monitor other parameters. Conceivable here are the state of the mold, i. the position of the two mold halves.
  • the vacuum pressure casting plant has a vacuum system 12, in which in this example a first buffer tank 13 and a second buffer tank 14 are provided.
  • the first buffer tank is connected via a chamber vacuum line 21 to the casting chamber and forms the chamber circle.
  • a valve 6 is provided, so that the gas flow between the buffer tank and the casting chamber can be interrupted.
  • a chamber inlet measuring head 11 allows the measurement of the pressure in the chamber vacuum line.
  • the pressure in the buffer tank 13 is determined via a first container measuring head 15.
  • the second buffer tank 14 is connected via a mold vacuum line 22 to the vent valve 4 and above with the mold 1a, 1b and forms the mold circle.
  • a Mold supply valve 5 is provided, which allows an interruption of the gas flow.
  • a mold supply measuring head 10 allows the measurement of the pressure in the line 22.
  • a vacuum pump 20 serves to evacuate the buffer container. Between the buffer tanks and the vacuum pump valves 17 and 18 are provided so that the buffer tank can be individually connected to the vacuum pump.
  • a vacuum system controller 7 records the measured values of the measuring heads 10, 11, 15 and 16 and sets the state of the valves 5, 6, 17 and 18. It receives from the casting machine control 8 a signal which depicts the status of the casting process.
  • This signal may be, for example, a simple trigger pulse that states that the casting process is starting. Alternatively, it is possible to transmit the position of the piston to the vacuum system controller. The signal allows the controller to run the two-stage vacuum generation process suitable for the casting operation in this example.
  • the mold feed measuring head 10 is arranged in the vent valve or between it and the mold inlet valve 5.
  • the next measuring point is a second container measuring head 16 on the buffer tank 14.
  • the pressure can be measured via an additional built-in valve, which is not used for venting purposes and only the measurement is useful.
  • the third measuring point is located in the chamber circle on the chamber vacuum line 21 zwisczhen chamber inlet valve and casting chamber. The fourth measuring point is given via the first container measuring head 15.
  • the following process parameters can be derived from these pressure measurements: the final pressure in the first buffer tank 13, the final pressure in the second buffer tank 14, the volumes extracted in the molding circle and in the chamber circle, respectively, and extracted total volume. From the final and initial pressure of a container and its volume, the amount of extracted gases can be determined and expressed as normal volume. Furthermore, the ratio of the extracted volumes of the two circuits and the achieved vacuum in the mold cavity as process parameters are accessible and monitorable. Based on the pressure curves and the tracking of the conductivity and leakage values, the achieved vacuum or the residual air quantity in the mold cavity can be determined. This parameter is directly related to the quality of the castings.
  • the conductivity of the vacuum die casting plant is determined.
  • the piston 3 is left in its starting position, ie it stands on the end of the casting chamber facing away from the mold and releases the filling opening 23.
  • the air can flow freely through the filling opening 23, through the casting chamber 2, mold 1a, 1b, vent valve 4 and mold vacuum feed line 22.
  • the shape geometry, channels and vent valve form the main resistors against this gas flow.
  • the mold feed valve 5 is closed and the second buffer tank valve 18 is open.
  • the second buffer tank 14 is evacuated by the vacuum pump 20. Then, with the piston still in the initial position, the buffer container valve 18 is closed and the mold supply valve 5 is opened.
  • the pressure rise in the second buffer tank can be monitored.
  • the total conductance can be determined.
  • this test may be conducted in open form. In this way, the conductance is determined from the part of the vent valve in the movable mold half.
  • the leakage rate of the vacuum pressure casting plant is determined.
  • the piston is moved past the filling opening. It is thus in a position between the filling opening 23 and the mold 1a, 1b, that the chamber vacuum supply line 21 is in communication with the mold.
  • the chamber feed valve 6 and the mold feed valve 5 are closed, and the first buffer tank valve 17 is opened, so that the vacuum pump 20 evacuates the first buffer tank 13.
  • the piston 3 is moved to the position described above and set there for further measurement.
  • the chamber inlet valve 6 is opened, the mold inlet valve 5 remains closed.
  • a pressure equalization takes place.
  • the length of time for this process depends on the volumes. From this balancing pressure, the pressure continues to rise. Temporally spaced, two pressure measurements are now made on the first container measuring head 15 and the pressure increase in the first buffer container 13 is measured. From the volume of this buffer tank and the measured pressure increase results in the total leakage rate of the mold, casting chamber and vacuum system. It would also be possible to perform this measurement with the circle. Due to the poorer conductance in this circle, however, this measurement would be less accurate, so that it is advantageous to run the measurement over the chamber circle.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Measuring Fluid Pressure (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Claims (6)

  1. Installation de coulée sous pression à vide comprenant un moule (1a, 1b), une chambre de coulée (2), un piston (3), une soupape d'évacuation d'air (4), un dispositif de commande d'installation de coulée (8) et un système de vide (12), dans laquelle il est agencé sur une conduite de vide (22) desservant le moule, une tête manométrique de conduite au moule (10) et, sur un réservoir tampon (14), une tête manométrique de réservoir (16) destinées à mesurer la pression, chacune desdites têtes manométriques étant connectée à un dispositif de commande (7) du système de vide (12), caractérisée en ce qu'il est prévu une conduite de vide (21) desservant la chambre de coulée (2), en ce qu'il est agencé, entre une soupape située sur ladite conduite de vide (21) et la chambre de coulée (2), une tête manométrique de chambre (11) connectée au dispositif de commande (7) du système de vide (12) et en ce que ledit système de vide (12) comporte un premier réservoir tampon (13) doté d'une première tête manométrique de réservoir (15) et un second réservoir tampon (14) doté d'une seconde tête manométrique de réservoir (16), de sorte qu'il est possible de déterminer sur l'installation de coulée sous pression à vide certains paramètres du vide produit.
  2. Procédé de mise en oeuvre d'une installation de coulée sous pression à vide (1) selon la revendication 1, dans lequel ladite installation de coulée comprend un moule (1a, 1b), une chambre de coulée (2) et un piston (3), caractérisé en ce que l'on détermine, avant le début de la coulée, un paramètre du vide produit dans l'installation de coulée, en mesurant la montée en pression dans un réservoir tampon (13, 14).
  3. Procédé selon la revendication 2, caractérisé en ce que le paramètre de vide retenu est le taux de fuite, le piston (3) étant dans ce cas positionné, pendant la mesure de la montée en pression, entre une ouverture d'admission (23) et le moule (1a, 1b), de telle sorte que la conduite de vide (21) desservant la chambre (2) est en liaison avec le moule.
  4. Procédé selon la revendication 2, caractérisé en ce que le paramètre de vide retenu est le débit de gaz, le piston (3) étant dans ce cas placé, pendant la mesure de la montée en pression, dans une position permettant le passage d'un flux de gaz entre l'ouverture d'admission (23) et le moule (1a, 1b).
  5. Procédé selon la revendication 2, caractérisé en ce que l'on détermine comme paramètres du vide produit, à la fois le débit de gaz et le taux de fuite.
  6. Procédé selon la revendication 2, caractérisé en ce que la détermination d'un paramètre du vide produit dans l'installation de coulée sous pression à vide est renouvelée après plusieurs coulées.
EP07004292A 2006-03-06 2007-03-02 Installation de coulée sous pression à vide et procédé de de mise en oeuvre Active EP1832362B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07004292T PL1832362T3 (pl) 2006-03-06 2007-03-02 Urządzenie do odlewania ciśnieniowo-próżniowego i sposób jego eksploatacji

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006010560A DE102006010560A1 (de) 2006-03-06 2006-03-06 Vakuumdruckgussanlage und Verfahren zum Betrieb

Publications (2)

Publication Number Publication Date
EP1832362A1 EP1832362A1 (fr) 2007-09-12
EP1832362B1 true EP1832362B1 (fr) 2009-09-30

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EP07004292A Active EP1832362B1 (fr) 2006-03-06 2007-03-02 Installation de coulée sous pression à vide et procédé de de mise en oeuvre

Country Status (4)

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EP (1) EP1832362B1 (fr)
AT (1) ATE444131T1 (fr)
DE (2) DE102006010560A1 (fr)
PL (1) PL1832362T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8967232B2 (en) 2009-09-22 2015-03-03 Ksm Castings Group Gmbh Vacuum die-casting system and method for operation of such a vacuum die-casting system

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008016919B3 (de) * 2008-03-27 2009-11-05 Electronics Gmbh Vertrieb Elektronischer Geräte Verfahren zum Entlüften des Formhohlraums einer Gießvorrichtung sowie Vakuumanlage und Gießvorrichtung zur Durchführung des Verfahrens
CN106457373A (zh) * 2014-05-06 2017-02-22 布勒股份公司 用于操作真空压铸机的方法
DE102015104120B3 (de) * 2015-03-19 2016-07-28 Vogel Moulds And Machines Ag Vakuumdruckgiessanlage mit einer Gießvorrichtung
US11738388B2 (en) * 2018-09-21 2023-08-29 Honda Motor Co., Ltd. Casting mold for die casting, and method for setting decompression path conductance thereof
DE102019100282B4 (de) 2019-01-08 2020-07-30 InterGuss Gießereiprodukte GmbH Vakuumdruckgussanlage und Strömungsventil zur Verwendung in einer Vakuumdruckgussanlage
DE102019107325A1 (de) * 2019-03-21 2020-09-24 Engel Austria Gmbh Aufschmelzeinheit für eine Formgebungsmaschine und Formgebungsmaschine mit einer solchen
DE102024121519A1 (de) * 2024-07-29 2026-01-29 InterGuss Gießereiprodukte GmbH Entlüftungsvorrichtung, Gießvorrichtung mit Entlüftungsvorrichtung, Vakuumdruckgussanlage und Verfahren zum Betreiben der Vakuumdruckgussanlage

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
JPS602948B2 (ja) 1980-10-27 1985-01-24 彪 荒井 真空ダイカスト成型装置
AU581966B2 (en) * 1985-02-20 1989-03-09 Ube Industries, Ltd. Vertical injection apparatus for die casting machine
DE4239558A1 (de) * 1992-11-25 1994-05-26 Mueller Weingarten Maschf Verfahren zur Unterdruck-Herstellung bei einer Druckgießmaschine
DE19628870A1 (de) * 1996-07-17 1998-01-22 Alusuisse Bayrisches Druckgus Vorrichtung und Verfahren zur Herstellung von Druckgußteilen
DE19645104B4 (de) * 1996-10-31 2007-12-20 Pfeiffer Vacuum Gmbh Verfahren zur Durchführung eines Prozesses in einem mit Unterdruck beaufschlagten Prozessraum
DE10140657C1 (de) * 2001-08-24 2002-11-07 Mueller Weingarten Maschf Messung des Druckes in einer Form während des Füllvorgangs

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8967232B2 (en) 2009-09-22 2015-03-03 Ksm Castings Group Gmbh Vacuum die-casting system and method for operation of such a vacuum die-casting system

Also Published As

Publication number Publication date
DE502007001603D1 (de) 2009-11-12
ATE444131T1 (de) 2009-10-15
PL1832362T3 (pl) 2010-02-26
DE102006010560A1 (de) 2007-09-13
EP1832362A1 (fr) 2007-09-12

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