EP0061532B1 - Device for pressure casting - Google Patents

Device for pressure casting Download PDF

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Publication number
EP0061532B1
EP0061532B1 EP81110378A EP81110378A EP0061532B1 EP 0061532 B1 EP0061532 B1 EP 0061532B1 EP 81110378 A EP81110378 A EP 81110378A EP 81110378 A EP81110378 A EP 81110378A EP 0061532 B1 EP0061532 B1 EP 0061532B1
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EP
European Patent Office
Prior art keywords
casting
space
pressure
pipe
valve
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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
Application number
EP81110378A
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German (de)
French (fr)
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EP0061532A1 (en
Inventor
Ivan Dimov Dipl.-Ing. Nikolov
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INSTITUT PO METALOSNANIE I TECHNOLOGIA NA METALITE
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INSTITUT PO METALOSNANIE I TECHNOLOGIA NA METALITE
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Priority to AT81110378T priority Critical patent/ATE19975T1/en
Publication of EP0061532A1 publication Critical patent/EP0061532A1/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
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/08—Controlling, supervising, e.g. for safety reasons
    • 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
    • B22D17/02—Hot chamber machines, i.e. with heated press chamber in which metal is melted
    • B22D17/06—Air injection machines
    • 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 die casting machine for carrying out a die casting process in which the melt is conveyed from a chamber hermetically closed by a lid in a container via a material line into a mold connected to it, fills it and in it, as a result of the effect of a pressure or a pressure difference solidifies, in which a gas pressure with the same gas phase as in the hermetically sealed chamber is generated via a first connecting line with a first valve immediately after the casting mold or after the solidification of the melt in the casting mold over the melt in the material line, and in which before the start of the next casting process, the space of the casting mold is flushed with the gas phase in the material line and in the hermetically sealed chamber, the material line and the casting mold being carried by an intermediate plate and a slide bed is provided in which a flat slide is provided is slidably arranged to open and close the material line.
  • the container holding the melt is located in a housing which is sealed on its upper side by the intermediate plate.
  • the one-piece material line which protrudes into the container for the melt, has a valve above the melt, but below the slide, with which the interior of the housing can be connected to or separated from the material line.
  • the housing and the intermediate plate as well as the jacket surrounding the casting mold and arranged on the intermediate plate have a permanent spatial assignment.
  • the known die casting machine requires a housing for the enclosure of the container that holds the melt, which means a great expenditure on equipment.
  • the arrangement and actuation of the slide in the slide bed is exposed to splashes of melt, so that the function of the slide in the bed is not guaranteed with certainty after several working cycles. Similar difficulties also arise with regard to the actuation of the valve on the material line.
  • the object underlying the invention is to design the die casting machine of the type mentioned in such a way that the disadvantages mentioned are avoided and a die casting machine is created in which, while maintaining the casting process in a protective atmosphere without an additional jacket for the container for the melt, a residue free of melt Separation of the mold and the melt container and a freeing of the associated functional parts of melt remnants is guaranteed.
  • the material line is formed by a main pouring tube and an additional pouring tube
  • the main pouring tube has an extension on the casting mold side in which the additional pouring tube is arranged, while the main pouring tube is closed by a flange cover through which it is connected to the intermediate plate, a neck being formed in the lid of the hermetically sealed chamber, to which a cylinder is attached, which is arranged in a jacket and to which the main pouring tube is fastened, the jacket on the intermediate plate is mounted and is provided with the slide bed, the flat slide is connected to a horizontal hydraulic cylinder.
  • the jacket is expediently connected to the outer surface of the cylinder via a sliding seal.
  • the space between the cylinder and the jacket can be connected to the space of the hermetically sealed chamber via a second pipeline with a second valve, a pressure measuring device being provided.
  • the mold is closed by a hermetically sealing lid which is mounted on the intermediate plate and is connected to a vertical cylinder, the space of the main pouring tube being the space of the hermetically sealed chamber and the space of the hermetically sealing lid being connected via a third pipe to a third Valve and a fourth valve is connected.
  • a differential pressure measuring device is provided.
  • the space of the hermetically sealing cover is additionally connected to the space between the jacket and the cylinder via a fifth pipeline with a fifth valve.
  • a lever mechanism which is connected to a third vertical hydraulic cylinder, can be mounted on the main pouring tube, a depression being formed in the bottom of the hermetically sealed chamber with the melt container.
  • the die casting machine has the advantage that a complete protection of the melt in the material line against the influence of the external environment or the gas in the casting mold is achieved, which ensures the production of high quality castings.
  • the mold can be flushed out before each pour, with the same gas that is supplied to the container for the melt.
  • the gas consumption for generating and maintaining a pressure in the container for the melt is reduced. This consumption includes only the gas that is expelled from the melt when the mold is filled, and the gas for purging or blowing through the mold.
  • the partial pressures of the gases that are in the gas phase in the container for the melt and in the material line are the same and practically do not change with each other following manufacture of castings. This allows an optimum amount of gas and other components dissolved in the melt to be achieved, especially if these components have a high vapor pressure or dissociation pressure at the casting temperature.
  • the partial pressure of a given active alloy gas can be increased or decreased simultaneously in the melt container, in the material line and in the mold. This affects the structure formation and ensures the formation of a solid solution of the alloying gas in the casting in accordance with the sudden change in its solubility in the phase transition between the solid and liquid state, which is the case with all successive castings of a melt batch in the melt container. There are no level fluctuations in the melt in the material line, which ensures complete control of the filling of the mold with the melt.
  • the machine shown in FIGS. 1 and 3 has a hermetically sealed chamber 1, in which a container 2 for the melt 3 is arranged.
  • the hermetically sealed chamber 1 is closed with a cover 4 on which a neck 41 is formed.
  • a cylinder 5 is mounted on the neck 41, and an inner flange 51 is formed at the upper end thereof.
  • the hermetically sealed chamber 1 is connected to the mold 13 by a material line.
  • the material line consists of two separate pouring tubes, namely a main pouring tube 6 and an additional pouring tube 18.
  • the main pouring tube 6 is provided with an extension 61 in which the additional pouring tube 18 is arranged.
  • the main pouring tube 6 is closed with a flange cover 7, via which it is connected to the intermediate plate 12.
  • the flange cover 7 is provided with an opening 71.
  • On the lower surface of the intermediate plate 12, a jacket 8 is mounted, in which the cylinder 5 is arranged.
  • the jacket 8 is connected to the outer surface of the cylinder 5 via a sliding seal 9.
  • the jacket 8 is provided with a slide bed 81, in which a flat slide 10 is arranged, which is connected to a horizontal hydraulic cylinder 11.
  • the casting mold 13 is arranged on the intermediate plate 12.
  • the additional pouring tube 18 is attached to the casting mold 13.
  • the mold 13 is closed by the hermetic cover 19, which is mounted on the intermediate plate 12 and is connected to a first vertical hydraulic cylinder 20.
  • the hermetic cover 19 consists of two parts, namely an upper part 191 and a lower cylindrical part 192.
  • the intermediate plate 12 is fastened via supporting columns 14 to a crossbeam 15 which is connected to the piston of a second vertical hydraulic cylinder 16.
  • the first vertical hydraulic cylinder 20 is fastened to the crossbar 15, while the second vertical hydraulic cylinder 16 is fastened to a support 17.
  • the space of the main pouring tube 6 is connected to the space of the hermetically sealed chamber 1 via a first pipeline with a first valve f.
  • the space between the cylinder 5 and the jacket 8 is connected to the space of the hermetically sealed chamber 1 by a second pipeline with a second valve f, a pressure measuring device M being provided.
  • the space of the hermetic cover 19 and the space of the hermetically sealed chamber 1 are connected via a third pipeline with a third valve g, a fourth valve g, a differential pressure measuring device M being provided.
  • the space of the hermetic cover 19 is connected via a fifth pipe with a fifth valve c to the space between the jacket 8 and the cylinder 5.
  • a lever mechanism 21 is mounted on the main pouring tube 6, which is provided for its movement in the vertical direction and is connected to a third vertical hydraulic cylinder 22.
  • a recess 23 is formed in the bottom of the container 2 for the melt 3.
  • the room in The hermetically sealed chamber 1 with the container 2 for the melt 3 is filled with sulfur dioxide or argon or a mixture of these gases at a desired pressure.
  • the valve f is open and the pressure of the gas in the space of the hermetically sealed chamber 1 and in the space of the main pouring tube 6 above the melt 3 is balanced, its value being read on the differential pressure measuring device M, namely with the valve g open and the valve g closed i .
  • the valves a, b, c, d, f 1 are closed.
  • the hermetic lid 19 is closed together with the upper part of the mold 13 by moving downwards, which is generated by the first vertical hydraulic cylinder 20, the closed space being hermetically sealed.
  • the valves b and c are opened, after which the space under the hermetic cover 19 is filled with nitrogen until the pressure in the hermetically sealed chamber 1 is equalized. This is indicated by the zero display of the differential pressure measuring device M.
  • valve b is closed. There follows a signal for the movement of the intermediate plate 12 in its upper end position, after which the flat slide 10 is opened while the second vertical hydraulic cylinder 16 moves the intermediate plate 12 downwards until it rests on the elastic seal on the flange cover 7 of the main pouring tube 6.
  • a signal follows for the closing of the valves c, and g and the opening of the valve a, which controls the desired pouring process, and the valves f, and g l .
  • the pressure in the hermetically sealed chamber 1 begins to rise.
  • the melt 3 begins to rise in the main pouring tube 6 and forces the sulfur dioxide or argon located there in front of it.
  • the differential pressure measuring device M shows a small overpressure due to the throttling action in the ventilation channels of the mold 13.
  • the melt 3 reaches the lower end of the additional pouring tube 18, it rises further into this tube, forcing the lighter nitrogen out of the casting mold 13 and replaces it with the sulfur dioxide or argon flowing in front of it, while the melt in the space between the two pouring tubes compresses the sulfur dioxide or argon enclosed in it.
  • the casting mold 13 is filled with melt which is in practically continuous contact with protective gas in the form of sulfur dioxide or argon.
  • the differential pressure measuring device M shows the increase in pressure as a function of time according to a law that is specific to the configuration of the mold cavity 13.
  • the pointer of the differential pressure measuring device M begins to deviate rapidly and, upon reaching a predetermined specific size for the displayed pressure difference, gives a signal for the closing of the valve a.
  • the valve f is opened at the same time as the valve a is closed, with a rapid equalization of the pressures occurring in the space of the main pouring tube 6 and in the space of the container 2.
  • the level of the melt in the space between the main pouring tube 6 and the additional pouring tube 18 drops.
  • the protective gas in the form of sulfur dioxide or argon which has the same composition as in the container 2 for the melt 3, enters the additional pouring tube 18 and the casting mold 13 and from there forces the melt out is below the level of the feed.
  • the horizontal hydraulic cylinder 11 for moving the flat slide 10 upwards can be actuated immediately, the additional pouring tube 18 being pulled out of the extension 61 of the main pouring tube 6.
  • valves c and C1 are opened, as a result of which the pressure in the space around the mold 13 and in the space between the cylinder 5 and the jacket 8 is reduced, the nitrogen escaping from the space of the mold 13 .
  • Sulfur dioxide or argon continues to act in the space between the cylinder 5 and the jacket 8, namely at a pressure which is balanced with the external atmospheric pressure.
  • the pressure gauges M and M 1 show zero display.
  • the valve g 1 is closed, the valve g is opened, the differential pressure measuring device M being switched on to display the pressure in the container 2 for the melt 3.
  • Valves c and C1 are normally closed.
  • the opening of the outlet pipeline after the valve C1 is raised above the level of the intermediate plate 12, which does not allow air to enter the space between the cylinder 5 and the jacket 8 during the opening of the mold 13. If necessary, the valve C1 can remain closed during the opening of the mold 13.
  • the layer of heavier protective gas in the room from the feed to the lower end of the additional pouring tube 18 also does not allow air to enter the room between the cylinder 5, the jacket 8 and the intermediate plate 12.
  • the upper part of the casting mold is opened and the finished casting is removed, after which the casting mold 13 is prepared for the next casting.
  • the exemplary embodiment described also applies to casting under low pressure or vacuum, the container 2 for the melt remaining under constant pressure, the same gas acting above the level of the melt 3 in the container 2 and in the main pouring tube 6.
  • the container 2 for the melt 3 can also be moved vertically with a view to pressing the flat slide 10 against the elastic seal of the flange 7 of the main pouring tube 6 and pulling out the additional pouring tube 18 from the extension 61 of the main pouring tube 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Dental Prosthetics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Description

Die Erfindung betrifft eine Druckgießmaschine zur Durchführung eines Druckgießverfahrens, bei welchem.die Schmelze infolge der Wirkung eines Druck oder eines Druckunterschieds von einer von einem Deckel hermetisch geschlossenen Kammer in einem Behälter über eine Materialleitung in eine damit verbundene Gießform gefördert wird, diese ausfüllt und in ihr erstarrt, bei welchem unmittelbar nach dem Füllen der Gießform oder nach dem Erstarren der Schmelze in der Gießform über der Schmelze in der Materialleitung ein Gasdruck mit derselben Gasphase wie in der hermetisch geschlossenen Kammer über eine erste Verbindungsleitung mit einem ersten Ventil erzeugt wird, und bei welchem vor dem Beginn des nächstfolgenden Gießvorgangs der Raum der Gießform mit der Gasphase in der Materialleitung und in der hermetisch geschlossenen Kammer durchgespült wird, wobei die Materialleitung und die Giesform von einer Zwischenplatte getragen werden und ein Schieberbett vorgesehen ist, in dem ein flacher Schieber zum Öffnen und Schließen der Materialleitung verschiebbar angeordnet ist.The invention relates to a die casting machine for carrying out a die casting process in which the melt is conveyed from a chamber hermetically closed by a lid in a container via a material line into a mold connected to it, fills it and in it, as a result of the effect of a pressure or a pressure difference solidifies, in which a gas pressure with the same gas phase as in the hermetically sealed chamber is generated via a first connecting line with a first valve immediately after the casting mold or after the solidification of the melt in the casting mold over the melt in the material line, and in which before the start of the next casting process, the space of the casting mold is flushed with the gas phase in the material line and in the hermetically sealed chamber, the material line and the casting mold being carried by an intermediate plate and a slide bed is provided in which a flat slide is provided is slidably arranged to open and close the material line.

Bei einer solchen, aus der FR-A-20 20 237 bekannten Druckgießmaschine befindet sich der die Schmelze aufnehmende Behälter in einem Gehäuse, das auf seiner Oberseite durch die Zwischenplatte abdichtend abgeschlossen ist. Die aus einem Stück bestehende Materialleitung, die in den Behälter für die Schmelze ragt, hat oberhalb der Schmelze, jedoch unterhalb des Schiebers ein Ventil, mit welchem der Innenraum des Gehäuses mit der Materialleitung in Verbindung gesetzt oder davon getrennt werden kann. Das Gehäuse und die Zwischenplatte sowie der die Gießform umgebende, auf der Zwischenplatte angeordnete Mantel haben eine permanente räumliche Zuordnung.In such a die casting machine known from FR-A-20 20 237, the container holding the melt is located in a housing which is sealed on its upper side by the intermediate plate. The one-piece material line, which protrudes into the container for the melt, has a valve above the melt, but below the slide, with which the interior of the housing can be connected to or separated from the material line. The housing and the intermediate plate as well as the jacket surrounding the casting mold and arranged on the intermediate plate have a permanent spatial assignment.

Die bekannte Druckgießmaschine benötigt ein Gehäuse für die Umschließung des die Schmelze aufnehmenden Behälters, was einen großen apparativen Aufwand bedeutet. Die Anordnung und Betätigung des Schiebers im Schieberbett ist Spritzern von Schmelze ausgesetzt, so daß die Funktion des Schiebers im Bett nach mehreren Arbeitszyklen nicht mit Sicherheit gewährleistet ist. Ähnliche Schwierigkeiten stellen sich auch hinsichtlich der Betätigung des Ventils an der Materialleitung ein.The known die casting machine requires a housing for the enclosure of the container that holds the melt, which means a great expenditure on equipment. The arrangement and actuation of the slide in the slide bed is exposed to splashes of melt, so that the function of the slide in the bed is not guaranteed with certainty after several working cycles. Similar difficulties also arise with regard to the actuation of the valve on the material line.

Die der Erfindung zugrunde liegende Aufgabe besteht darin, die Druckgießmaschine der eingangs genannten Art so auszubilden, daß die erwähnten Nachteile vermieden werden und eine Druckgießmaschine geschaffen wird, bei welcher unter Beibehaltung des Gießvorgangs in einer Schutzatmosphäre ohne zusätzlichen Mantel für den Behälter für die Schmelze ein schmelzerestfreies Trennen von Gießform und Schmelzenbehälter und ein Freibleiben der dazugehörenden Funktionsteile von Schmelzenresten gewährleistet ist.The object underlying the invention is to design the die casting machine of the type mentioned in such a way that the disadvantages mentioned are avoided and a die casting machine is created in which, while maintaining the casting process in a protective atmosphere without an additional jacket for the container for the melt, a residue free of melt Separation of the mold and the melt container and a freeing of the associated functional parts of melt remnants is guaranteed.

Diese Aufgabe wird ausgehend von der Druckgießmaschine der eingangs genannten Art dadurch gelöst, daß die Materialleitung von einem Hauptgießrohr und einem zusätzlichen Gießrohr gebildet wird, daß das Hauptgießrohr eine gießformseitige Erweiterung aufweist, in der das zusätzliche Gießrohr angeordnet ist, während das Hauptgießrohr von einem Flanschdeckel geschlossen ist, durch den es mit der Zwischenplatte verbunden ist, wobei im Deckel der hermetisch geschlossenen Kammer ein Hals ausgebildet ist, an dem ein Zylinger angebracht ist, der in einem Mantel angeordnet ist und an dem das Hauptgießrohr befestigt ist, wobei der Mantel an der Zwischenplatte montiert ist und mit dem Schieberbett versehen ist, dessen flacher Schieber mit einem horizontalen hydraulischen Zylinder verbunden ist.This object is achieved on the basis of the die casting machine of the type mentioned at the outset in that the material line is formed by a main pouring tube and an additional pouring tube, in that the main pouring tube has an extension on the casting mold side in which the additional pouring tube is arranged, while the main pouring tube is closed by a flange cover through which it is connected to the intermediate plate, a neck being formed in the lid of the hermetically sealed chamber, to which a cylinder is attached, which is arranged in a jacket and to which the main pouring tube is fastened, the jacket on the intermediate plate is mounted and is provided with the slide bed, the flat slide is connected to a horizontal hydraulic cylinder.

Zweckmäßigerweise ist dabei der Mantel mit der äußeren Oberfläche des Zylinders über eine Gleitdichtung verbunden.The jacket is expediently connected to the outer surface of the cylinder via a sliding seal.

Der Raum zwischen dem Zylinder und dem Mantel kann mit dem Raum der hermetisch geschlossenen Kammer über eine zweite Rohrleitung mit einem zweiten Ventil verbunden werden, wobei ein Druckmeßgerät vorgesehen wird.The space between the cylinder and the jacket can be connected to the space of the hermetically sealed chamber via a second pipeline with a second valve, a pressure measuring device being provided.

Vorteilhafterweise ist die Gießform von einem hermetisch abdichtenden Deckel verschlossen, der an der Zwischenplatte montiert ist und mit einem vertikalen Zylinder verbunden ist, wobei der Raum des Hauptgießrohrs der Raum der hermetisch geschlossenen Kammer und der Raum des hermetisch abdichtenden Deckels über eine dritte Rohrleitung mit einem dritten Ventil und einem vierten Ventil verbunden ist. Dabei ist ein Differenzdruckmeßgerät vorgesehen. Der Raum des hermetisch abdichtenden Deckels ist zusätzlich über eine fünfte Rohrleitung mit einem fünften Ventil mit dem Raum zwischen dem Mantel und dem Zylinder verbunden.Advantageously, the mold is closed by a hermetically sealing lid which is mounted on the intermediate plate and is connected to a vertical cylinder, the space of the main pouring tube being the space of the hermetically sealed chamber and the space of the hermetically sealing lid being connected via a third pipe to a third Valve and a fourth valve is connected. A differential pressure measuring device is provided. The space of the hermetically sealing cover is additionally connected to the space between the jacket and the cylinder via a fifth pipeline with a fifth valve.

An dem Hauptgießrohr kann ein Kebelmechanismus montiert sein, der mit einem dritten vertikalen hydraulischen Zylinder verbunden ist, wobei im Boden der hermetisch geschlossenen Kammer mit dem Schmelzebehälter eine Vertiefung ausgebildet ist.A lever mechanism, which is connected to a third vertical hydraulic cylinder, can be mounted on the main pouring tube, a depression being formed in the bottom of the hermetically sealed chamber with the melt container.

Die erfindungsgemäße Druckgießmaschine hat den Vorteil, daß ein völliger Schutz der Schmelze in der Materialleitung gegenüber der Einwirkung der Außenumgebung oder des Gases in der Gießform erzielt wird, was die Herstellung von Gußstücken hoher Qualität gewährleistet. Die Gießform kann vor jedem Gießgang durchgespült werden, und zwar mit dem gleichen Gas, das dem Behälter für die Schmelze zugeführt ist. Der Gasverbrauch für die Erzeugung und Aufrechterhaltung eines Drucks im Behälter für die Schmelze wird reduziert. Dieser Verbrauch umfaßt nur das Gas, das bei dem Füllen der Gießform von der Schmelze hinausgedrängt wird, sowie das Gas für das Durchspülen oder Durchblasen der Gießform. Die Partialdrücke der Gase, die sich in der Gasphase im Behälter für die Schmelze und in der Materialleitung befinden, sind gleich groß und ändern sich praktisch nicht bei der aufeinanderfolgenden Herstellung von Gußstücken. Dadurch läßt sich eine optimale Menge an in der Schmelze gelöstem Gas und anderen Komponenten erreichen, vor allem wenn diese Komponenten einen hohen Dampfdruck oder Dissoziationsdruck bei der Gießtemperatur aufweisen.The die casting machine according to the invention has the advantage that a complete protection of the melt in the material line against the influence of the external environment or the gas in the casting mold is achieved, which ensures the production of high quality castings. The mold can be flushed out before each pour, with the same gas that is supplied to the container for the melt. The gas consumption for generating and maintaining a pressure in the container for the melt is reduced. This consumption includes only the gas that is expelled from the melt when the mold is filled, and the gas for purging or blowing through the mold. The partial pressures of the gases that are in the gas phase in the container for the melt and in the material line are the same and practically do not change with each other following manufacture of castings. This allows an optimum amount of gas and other components dissolved in the melt to be achieved, especially if these components have a high vapor pressure or dissociation pressure at the casting temperature.

Für kurze Zeit kann außerdem vor dem Füllen der Gießform der Partialdruck eines gegebenen aktiven legierenden Gases gleichzeitig im Behälter für die Schmelze, in der Materialleitung und in der Gießform erhöht oder gesenkt werden. Dies beeinflußt die Gefügebildung und gewährleistet die Bildung einer festen Lösung des legierenden Gases im Gußstück in Übereinstimmung mit der sprungartigen Änderung seiner Löslichkeit im Phasenübergang zwischen dem festen und flüssigen Zustand, was bei allen aufeinanderfolgenden Gußstücken einer Schmelzencharge im Schmelzebehälter der Fall ist. In der Materialleitung treten keine Niveauschwankungen der Schmelze auf, wodurch eine vollständige Kontrolle für das Füllen der Gießform mit Schmelze gewährleistet ist.In addition, for a short time, prior to filling the mold, the partial pressure of a given active alloy gas can be increased or decreased simultaneously in the melt container, in the material line and in the mold. This affects the structure formation and ensures the formation of a solid solution of the alloying gas in the casting in accordance with the sudden change in its solubility in the phase transition between the solid and liquid state, which is the case with all successive castings of a melt batch in the melt container. There are no level fluctuations in the melt in the material line, which ensures complete control of the filling of the mold with the melt.

Aufgrund der erfindungsgemäßen Anordnung wird eine einwandfreie Funktion und lange Lebensdauer der Druckgießmaschine gewährleistet, da die für das Trennen von Gießform und Behälter für die Schmelze eingesetzten Elemente nicht mit Resten erstarrender Schmelze in Kontakt kommen. Außerdem entfällt die aufwendige Ummantelung des Behälters für die Schmelze.Due to the arrangement according to the invention, proper functioning and a long service life of the die casting machine are ensured, since the elements used for separating the casting mold and the container for the melt do not come into contact with remnants of solidifying melt. In addition, the complex sheathing of the container for the melt is eliminated.

Anhand der Zeichnung wird die Erfindung beispielsweise nährer erläutert. Es zeigt:

  • Fig. 1 schematisch im Längsschnitt eine Maschine beim Gießen unter Gasgegendruck;
  • Fig. 2 im Längsschnitt die Materialleitung und die Gießform vor dem Verbinden des Hauptgießrohres mit der Gießform;
  • Fig. 3 schematisch eine Ausführungsform der Maschine, bei welcher die hermetisch geschlossene Kammer und das Hauptgießrohr beweglich sind und
  • Fig. 4 schematisch im Längsschnitt eine Ausführungsform der Maschine, bei der das Hauptgießrohr beweglich ist.
With the aid of the drawing, the invention is explained in more detail, for example. It shows:
  • Figure 1 shows schematically in longitudinal section a machine when casting under gas back pressure.
  • 2 shows in longitudinal section the material line and the casting mold before connecting the main pouring tube to the casting mold;
  • Fig. 3 schematically shows an embodiment of the machine in which the hermetically sealed chamber and the main pouring tube are movable and
  • Fig. 4 shows schematically in longitudinal section an embodiment of the machine in which the main pouring tube is movable.

Die in Fig. 1, und 3 gezeigte Maschine hat eine hermetisch abgedichtete Kammer 1, in welcher ein Behälter 2 für die Schmelze 3 angeordnet ist. Die hermetisch abgedichtete Kammer 1 ist mit einem Deckel 4 geschlossen, an dem ein Hals 41 ausgebildet ist. An dem Hals 41 ist ein Zylinder 5 montiert, an dessen oberem Ende ein innerer Flansch 51 ausgebildet ist. Die hermetisch abgeschlossene Kammer 1 ist durch eine Materialleitung mit der Gießform 13 verbunden. Die Materialleitung besteht aus zwei separaten Gießrohren und zwar aus einem Hauptgießrohr 6 und einem zusätzlichen Gießrohr 18. Das Hauptgießrohr 6 ist mit einer Erweiterung 61 versehen, in der das zusätzliche Gießrohr 18 angeordnet ist. Das Hauptgießrohr 6 ist mit einem Flanschdeckel 7 geschlossen, über den es mit der Zwischenplatte 12 verbunden ist. Der Flanschdeckel 7 ist mit einer Öffnung 71 versehen. An der unteren Oberfläche der Zwischenplatte 12 ist ein Mantel 8 montiert, in dem des Zylinder 5 angeordnet ist.The machine shown in FIGS. 1 and 3 has a hermetically sealed chamber 1, in which a container 2 for the melt 3 is arranged. The hermetically sealed chamber 1 is closed with a cover 4 on which a neck 41 is formed. A cylinder 5 is mounted on the neck 41, and an inner flange 51 is formed at the upper end thereof. The hermetically sealed chamber 1 is connected to the mold 13 by a material line. The material line consists of two separate pouring tubes, namely a main pouring tube 6 and an additional pouring tube 18. The main pouring tube 6 is provided with an extension 61 in which the additional pouring tube 18 is arranged. The main pouring tube 6 is closed with a flange cover 7, via which it is connected to the intermediate plate 12. The flange cover 7 is provided with an opening 71. On the lower surface of the intermediate plate 12, a jacket 8 is mounted, in which the cylinder 5 is arranged.

Der Mantel 8 ist mit der äußeren Oberfläche des Zylinders 5 über eine Gleitdichtung 9 verbunden. Der Mantel 8 ist mit einem Schieberbett 81 versehen, in dem ein flacher Schieber 10 angeordnet ist, der mit einem horizontalen hydraulischen Zylinder 11 verbunden ist.The jacket 8 is connected to the outer surface of the cylinder 5 via a sliding seal 9. The jacket 8 is provided with a slide bed 81, in which a flat slide 10 is arranged, which is connected to a horizontal hydraulic cylinder 11.

Die Gießform 13 ist auf die Zwischenplatte 12 angeordnet. An der Gießform 13 ist das zusätzliche Gießrohr 18 angebracht. Die Gießform 13 ist durch den hermetischen Deckel 19 geschlossen, der auf der Zwischenplatte 12 montiert und mit einem ersten vertikalen hydraulischen Zylinder 20 verbunden ist. Der hermetische Dekkel 19 besteht aus zwei Teilen, nämlich aus einem oberen Teil 191 und einem unteren zylindrischen Teil 192.The casting mold 13 is arranged on the intermediate plate 12. The additional pouring tube 18 is attached to the casting mold 13. The mold 13 is closed by the hermetic cover 19, which is mounted on the intermediate plate 12 and is connected to a first vertical hydraulic cylinder 20. The hermetic cover 19 consists of two parts, namely an upper part 191 and a lower cylindrical part 192.

Die Zwischenplatte 12 ist über tragende Säulen 14 an einem Querbalken 15 befestigt, der mit dem Kolben eines zweiten vertikalen hydraulischen Zylinders 16 verbunden ist. Am Querbalken 15 ist der erste vertikale hydraulische Zylinder 20 befestigt, während der zweite vertikale hydraulische Zylinder 16 an einer Stütze 17 befestigt ist.The intermediate plate 12 is fastened via supporting columns 14 to a crossbeam 15 which is connected to the piston of a second vertical hydraulic cylinder 16. The first vertical hydraulic cylinder 20 is fastened to the crossbar 15, while the second vertical hydraulic cylinder 16 is fastened to a support 17.

Der Raum des Hauptgießrohrs 6 ist über eine erste Rohrleitung mit einem ersten Ventil f mit dem Raum der hermetisch abgedichteten Kammer 1 verbunden.The space of the main pouring tube 6 is connected to the space of the hermetically sealed chamber 1 via a first pipeline with a first valve f.

Der Raum zwischen dem Zylinder 5 und dem Mantel 8 ist mit dem Raum der hermetisch abgedichteten Kammer 1 durch eine zweite Rohrleitung mit einem zweiten Ventil f, verbunden, wobei ein Druckmeßgerät M, vorgesehen ist. Der Raum des hermetischen Deckels 19 und der Raum der hermetisch abgedichteten Kammer 1 sind über eine dritte Rohrleitung mit einem dritten Ventil g, einem vierten Ventil g angeschlossen, wobei ein Differendruckmeßgerät M vorgesehen ist. Der Raum des hermetischen Deckels 19 ist über eine fünfte Rohrleitung mit einem fünften Ventil c mit dem Raum zwischen dem Mantel 8 und dem Zylinder 5 verbunden.The space between the cylinder 5 and the jacket 8 is connected to the space of the hermetically sealed chamber 1 by a second pipeline with a second valve f, a pressure measuring device M being provided. The space of the hermetic cover 19 and the space of the hermetically sealed chamber 1 are connected via a third pipeline with a third valve g, a fourth valve g, a differential pressure measuring device M being provided. The space of the hermetic cover 19 is connected via a fifth pipe with a fifth valve c to the space between the jacket 8 and the cylinder 5.

Bei der in Fig. 4 gezeigten Ausführungsform ist an dem Hauptgießrohr 6 ein Hebelmechanismus 21 montiert, der für seine Bewegung in vertikaler Richtung vorgesehen und mit einem dritten vertikalen hydraulischen Zylinder 22 verbunden ist. Im Boden des Behälters 2 für die Schmelze 3 ist eine Vertiefung 23 ausgebildet.In the embodiment shown in FIG. 4, a lever mechanism 21 is mounted on the main pouring tube 6, which is provided for its movement in the vertical direction and is connected to a third vertical hydraulic cylinder 22. A recess 23 is formed in the bottom of the container 2 for the melt 3.

Als Beispiel für die Durchführung des Verfahrens mit der Druckgießmaschine wird das Gießen von mit der Atmosphäre stark reaktionsfähigen Werkstoffen betrachtet, wie z.B. Magnesiumlegierungen, und zwar beim Gießen unter Gegendruck in eine Dauerform bei Verwendung von zwei Gasen, nämlich Schwefeldioxid oder Argon als Schutzgas in der hermetisch geschlossenen Kammer mit dem Schmelzebehälter und Argon zum Erzeugen des Gegendrucks in der Gießform.The casting of materials that are highly reactive with the atmosphere, such as e.g. Magnesium alloys, when casting under counter pressure in a permanent mold using two gases, namely sulfur dioxide or argon as protective gas in the hermetically sealed chamber with the melt container and argon for generating the counter pressure in the casting mold.

In der Ausgangsstellung ist der obere Teil der Gießform 13 weggenommen, wobei der hermetische Deckel 19 geöffnet ist und der Flanschdeckel 7 des Hauptgießrohrs 6 durch den flachen Schieber 10 geschlossen ist. Der Raum in der hermetisch geschlossenen Kammer 1 mit dem Behälter 2 für die Schmelze 3 ist mit Schwefeldioxid oder Argon oder einer Mischung dieser Gase bei einem gewünschten Druck gefüllt. Das Ventil f ist offen und der Druck des Gases im Raum der hermetisch geschlossenen Kammer 1 und im Raum des Hauptgießrohrs 6 über der Schmelze 3 ist ausgeglichen, wobei sein Wert an dem Differentialdruckmeßgerät M abgelesen werden kann und zwar bei geöffnetem Ventil g und geschlossenem Ventil gi. Die Ventile a, b, c, d, f1 sind geschlossen.In the initial position, the upper part of the mold 13 is removed, the hermetic cover 19 being open and the flange cover 7 of the main pouring tube 6 being closed by the flat slide 10. The room in The hermetically sealed chamber 1 with the container 2 for the melt 3 is filled with sulfur dioxide or argon or a mixture of these gases at a desired pressure. The valve f is open and the pressure of the gas in the space of the hermetically sealed chamber 1 and in the space of the main pouring tube 6 above the melt 3 is balanced, its value being read on the differential pressure measuring device M, namely with the valve g open and the valve g closed i . The valves a, b, c, d, f 1 are closed.

Für den Gießvorgang wird der hermetische Deckel 19 zusammen mit dem oberen Teil der Gießform 13 durch Abwärtsbewegen geschlossen, das durch den ersten vertikalen hydraulischen Zylinder 20 erzeugt wird, wobei der geschlossene Raum hermetisch abgedichtet wird. Die Ventile b und c, werden geöffnet, wonach der Raum unter dem hermetischen Deckel 19 mit Stickstoff bis zum Ausgleichen des Drucks mit dem in der hermetisch geschlossenen Kammer 1 gefüllt wird. Dies wird durch Nullanzeige des Differentialdruckmeßgeräts M angezeigt. Danach wird das Ventil b geschlossen. Es folgt ein Signal für die Bewegung der Zwischenplatte 12 in ihrer oberen Endposition, wonach der flache Schieber 10 geöffnet wird, während der zweite vertikale hydraulische Zylinder 16 die Zwischenplatte 12 bis zum Aufsitzen auf der elastischen Dichtung an dem Flanschdeckel 7 des Hauptgießrohrs 6 abwärts bewegt. In diesem Moment gelangt das zusätzliche Gießrohr 18 in die Erweiterung 61 des Hauptgießrohrs 6. Es folft ein Signal für das Schließen der Ventile c, und g und das Öffnen des Ventils a, das den gewünschten Gießvorgang steuert, sowie der Ventile f, und gl.For the casting process, the hermetic lid 19 is closed together with the upper part of the mold 13 by moving downwards, which is generated by the first vertical hydraulic cylinder 20, the closed space being hermetically sealed. The valves b and c are opened, after which the space under the hermetic cover 19 is filled with nitrogen until the pressure in the hermetically sealed chamber 1 is equalized. This is indicated by the zero display of the differential pressure measuring device M. Then valve b is closed. There follows a signal for the movement of the intermediate plate 12 in its upper end position, after which the flat slide 10 is opened while the second vertical hydraulic cylinder 16 moves the intermediate plate 12 downwards until it rests on the elastic seal on the flange cover 7 of the main pouring tube 6. At this moment, the additional pouring tube 18 arrives in the extension 61 of the main pouring tube 6. A signal follows for the closing of the valves c, and g and the opening of the valve a, which controls the desired pouring process, and the valves f, and g l .

Der Druck in der hermetisch geschlossenen Kammer 1 beginnt zu steigen. Die Schmelze 3 beginnt in dem Hauptgießrohr 6 zu steigen und drängt vor sich das sich dort befindende Schwefeldioxid oder Argon. Während dieser Zeit zeigt das Differentialdruckmeßgerät M einen kleinen Überdruck infolge der Drosselwirkung in den Entlüftungskanälen der Gießform 13. Wenn die Schmelze 3 das untere Ende des zusätzlichen Gießrohrs 18 erreicht, steigt sie weiter in dieses Rohr, drängt den leichteren Stickstoff aus der Gießform 13 heraus und ersetzt ihn durch das vor ihr strömende Schwefeldioxid oder Argon, während die Schmelze im Raum zwischen den beiden Gießrohren das darin eingeschlossene Schwefeldioxid oder Argon komprimiert.The pressure in the hermetically sealed chamber 1 begins to rise. The melt 3 begins to rise in the main pouring tube 6 and forces the sulfur dioxide or argon located there in front of it. During this time, the differential pressure measuring device M shows a small overpressure due to the throttling action in the ventilation channels of the mold 13. When the melt 3 reaches the lower end of the additional pouring tube 18, it rises further into this tube, forcing the lighter nitrogen out of the casting mold 13 and replaces it with the sulfur dioxide or argon flowing in front of it, while the melt in the space between the two pouring tubes compresses the sulfur dioxide or argon enclosed in it.

Die Gießform 13 wird mit Schmelze gefüllt, die praktisch ununterbrochen in Berührung mit Schutzgas in Form von Schwefeldioxid oder Argon steht. Bis zum vollständigen Füllen der Gießform 13 mit Schmelze zeigt das Differentialdruckmeßgerät M die Erhöhung des Drucks als Funktion der Zeit nach einem Gesetz, das spezifisch für die Konfiguration des Gießformhohlraums 13 ist. Nach dem vollständigen Füllen der Gießform 13 beginnt der Zeiger des Differentialdruckmeßgeräts M schnell abzuweichen und gibt bei Erreichen einer vorgegebenen bestimmten Größe für den angezeigten Druckunterschied ein Signal für das Schließen des Ventils a.The casting mold 13 is filled with melt which is in practically continuous contact with protective gas in the form of sulfur dioxide or argon. Until the mold 13 is completely filled with melt, the differential pressure measuring device M shows the increase in pressure as a function of time according to a law that is specific to the configuration of the mold cavity 13. After the mold 13 has been completely filled, the pointer of the differential pressure measuring device M begins to deviate rapidly and, upon reaching a predetermined specific size for the displayed pressure difference, gives a signal for the closing of the valve a.

Bei fallendem Gießen wird gleichzeitig mit dem Schließen des Ventils a das Ventil f geöffnet, wobei ein schneller Ausgleich der Drücke im Raum des Hauptgießrohrs 6 und im Raum des Behälters 2 eintritt. Das Niveau der Schmelze im Raum zwischen dem Hauptgießrohr 6 und dem zusätzlichen Gießrohr 18 fällt ab. Nach Öffnen der Öffnung des zusätzlichen Gießrohrs 18 gelangt das Schutzgas in Form von Schwefeldioxid oder Argon, das die gleiche Zusammensetzung wie im Behälter 2 für die Schmelze 3 aufweist, in das zusätzliche Gießrohr 18 und die Gießform 13 und drängt von dort die Schmelze aus, die unter dem Niveau der Einspeisung liegt. Nach diesem Schritt kann sofort der horizontale hydraulische Zylinder 11 für das Versetzen des flachen Schiebers 10 nach oben betätigt werden, wobei das zusätzliche Gießrohr 18 aus der Erweiterung 61 des Hauptgießrohrs 6 herausgezogen wird. In der oberen Endposition des flachen Schiebers 10 wird ein Signal für dessen Versetzung über den Flanschdeckel 7 gegeben. Durch eine kurze Abwärtsbewegung der Zwischenplatte 12, hervorgerufen durch den zweiten hydraulischen Zylinder 16, drückt der flache Schieber 10 auf die elastische Dichtung, die über dem Flanschdeckel 7 vorgesehen ist. Das Sicherheitsventil f1, das während des Gießens geöffnet war, wird nach dem Schliessen von Ventil f geschlossen, um einer mögliche Berührung der Schmelze 3 bei ihrem Steigen mit der elastischen Dichtung bei eventuell schleichtem Abdichten zwischen der Erweiterung 61 des Hauptgießrohrs 6 und der Zwischenplatte 12 vorzubeugen. Während des Füllens der Gießform 13 mit Schmelze 3 zeigt das Druckmeßgerät M1 den Gesamtdruck im Behälter 2 an.If the pouring falls, the valve f is opened at the same time as the valve a is closed, with a rapid equalization of the pressures occurring in the space of the main pouring tube 6 and in the space of the container 2. The level of the melt in the space between the main pouring tube 6 and the additional pouring tube 18 drops. After opening the opening of the additional pouring tube 18, the protective gas in the form of sulfur dioxide or argon, which has the same composition as in the container 2 for the melt 3, enters the additional pouring tube 18 and the casting mold 13 and from there forces the melt out is below the level of the feed. After this step, the horizontal hydraulic cylinder 11 for moving the flat slide 10 upwards can be actuated immediately, the additional pouring tube 18 being pulled out of the extension 61 of the main pouring tube 6. In the upper end position of the flat slide 10, a signal for its displacement is given via the flange cover 7. By a short downward movement of the intermediate plate 12, caused by the second hydraulic cylinder 16, the flat slide 10 presses on the elastic seal which is provided above the flange cover 7. The safety valve f 1 , which was open during casting, is closed after valve f is closed, in order to prevent the melt 3 from touching when it rises with the elastic seal and possibly a slight sealing between the extension 61 of the main pouring tube 6 and the intermediate plate 12 to prevent. While the mold 13 is being filled with melt 3, the pressure measuring device M 1 shows the total pressure in the container 2.

Nach dem Erstarren des Gußstücks in der Gießform 13 werden die Ventile c und C1 geöffnet, wodurch im Raum um die Gießform 13 und im Raum zwischen dem Zylinder 5 und dem Mantel 8 der Druck abgebaut wird, wobei der Stickstoff aus dem Raum der Gießform 13 entweicht. Im Raum zwischen dem Zylinder 5 und dem Mantel 8 wirkt weiter Schwefeldioxid oder Argon und zwar bei einem Druck, die mit dem äußeren Atmosphärendruck ausgeglichen ist. Die Druckmeßgeräte M und M1 zeigen Nullanzeige. Das Ventil g1 wird geschlossen, das Ventil g geöffnet, wobei das Differentialdruckmeßgerät M eingeschaltet wird zur Anzeige des Drucks im Behälter 2 für die Schmelze 3.After the casting has solidified in the mold 13, the valves c and C1 are opened, as a result of which the pressure in the space around the mold 13 and in the space between the cylinder 5 and the jacket 8 is reduced, the nitrogen escaping from the space of the mold 13 . Sulfur dioxide or argon continues to act in the space between the cylinder 5 and the jacket 8, namely at a pressure which is balanced with the external atmospheric pressure. The pressure gauges M and M 1 show zero display. The valve g 1 is closed, the valve g is opened, the differential pressure measuring device M being switched on to display the pressure in the container 2 for the melt 3.

Die Ventile c und C1 sind normal geschlossen. Die Öffnung der Auslaßrohrleitung nach dem Ventil C1 ist über das Niveau der Zwischenplatte 12 angehoben, was das Eindringen von Luft in den Raum zwischen dem Zylinder 5 und dem Mantel 8 während des Öffnens der Gießform 13 nicht erlaubt. Erforderlichenfalls kann das Ventil C1 während des Öffnens der Gießform 13 geschlossen bleiben. Die Schicht von schwererem Schutzgas im Raum von der Zuführung bis zum unteren Ende des zusätzlichen Gießrohrs 18 erlaubt ebenfalls keinen Luftzutritt in den Raum zwischen dem Zylinder 5, dem Mantel 8 und der Zwischenplatte 12.Valves c and C1 are normally closed. The opening of the outlet pipeline after the valve C1 is raised above the level of the intermediate plate 12, which does not allow air to enter the space between the cylinder 5 and the jacket 8 during the opening of the mold 13. If necessary, the valve C1 can remain closed during the opening of the mold 13. The layer of heavier protective gas in the room from the feed to the lower end of the additional pouring tube 18 also does not allow air to enter the room between the cylinder 5, the jacket 8 and the intermediate plate 12.

Nach dem Abkühlen des Gußstücks bis auf Entnahmetemperatur wird der obere Teil der Gießform geöffnet und das fertige Gußstück entnommen, wonach die Gießform 13 für das nächstfolgende Gießen vorbereitet wird.After the casting has cooled to the removal temperature, the upper part of the casting mold is opened and the finished casting is removed, after which the casting mold 13 is prepared for the next casting.

Das beschriebene Ausführungsbeispiel gilt auch für das Gießen unter Niederdruck oder Vakuum, wobei der Behälter 2 für die Schmelze dauernd unter Druck bleibt, wobei über dem Niveau der Schmelze 3 im Behälter 2 und im Hauptgießrohr 6 das gleiche Gas wirkt.The exemplary embodiment described also applies to casting under low pressure or vacuum, the container 2 for the melt remaining under constant pressure, the same gas acting above the level of the melt 3 in the container 2 and in the main pouring tube 6.

Der Behälter 2 für die Schmelze 3 kann auch im Hinblick auf das Andrücken des flachen Schiebers 10 an die elastische Dichtung des Fianschdeckefs 7 des Hauptgießrohrs 6 und auf das Herausziehen des zusätzlichen Gießrohrs 18 aus der Erweiterung 61 des Hauptgießrohrs 6 vertikal bewegt werden.The container 2 for the melt 3 can also be moved vertically with a view to pressing the flat slide 10 against the elastic seal of the flange 7 of the main pouring tube 6 and pulling out the additional pouring tube 18 from the extension 61 of the main pouring tube 6.

Claims (5)

1. Pressure casting machine for carrying out a pressure casting method, by which the melted mass (3) is conveyed as a result of the effect of a pressure or a pressure difference from a chamber (1), which is hermetically closed by a cover (4), in a container (2) via a material line (6, 18) into a casting mould (13) connected therewith, fills up the latter and solidifies in it, by which immediately after the casting mould (13) has been filled or after the melted mass has solidified in the casting mould (13) over the melted mass in the material line (6, 18) a gas pressure is generated with the same gas phase as in the hermetically closed chamber (1) by way of a first connecting line with a first valve (f) and by which before the next casting process begins the space of the casting mould (13) is scavenged with the gas phase in the material line (6, 18) and in the hermetically closed chamber (1), in which case the material line (6,18) and the casting mould (13) are supported by an intermediate plate (12) and provision is made for a slide bed (81) in which a flat slide (10) for opening and closing the material line (6, 18) is arranged in a displaceable manner, characterised in that the material line is formed by a main casting pipe (6) and an additional casting pipe (18), the main casting pipe (6) has, on the casting mould side, a widened area (61) in which the additional casting pipe (18) is arranged, while the main casting pipe (6) is closed by a flange cover (7) through which it is connected with the intermediate plate (12), in which case developed in the cover (4) of the hermetically closed chamber there is a neck (41), provided on which there is a cylinder (5) which is arranged in a casing (8) and to which the main casting pipe (6) is secured, said casing (8) being mounted on the intermediate plate (12) and being provided with the slide bed (81), the flat slide (10) of which is connected with a horizontal hydraulic cylinder (11).
2. Pressure casting machine according to claim 1, characterised in that the casing (8) is connected with the outer surface of the cylinder (5) by way of a gliding seal (9).
3. Pressure casting machine according to claim 1 or 2, characterised in that the space between the cylinder (5) and the casing (8) is connected with the space of the hermetically closed chamber (1) by way of a second pipe line with a second valve (fi), provision being made for a pressure meter (Mi).
4. Pressure casting machine according to one of the claims 1 to 3, characterised in that the casting mould (13) is closed by a hermetically sealing cover (19), which is mounted on the intermediate plate (12), and is connected with a vertical cylinder (20), the space of the main casting pipe (6), the space of the hermetically closed chamber (1) and the space of the hermetically sealing cover (19) being connected by way of a third pipe line with a third valve (g,) and a fourth valve (g), there is provision for a differential pressure meter (M) and the space of the hermetically sealing cover (19) is connected by way of a fifth pipe line with a fifth valve (c) with the space between the casing (8) and the cylinder (5).
5. Pressure casting machine according to one of the claims 1 to 4, characterised in that mounted on the main casing pipe (6) there is a lever mechanism (21), which is connected with a vertical hydraulic cylinder (22), and a deepened area (23) is developed in the base of the hermetically closed chamber (1) with the melted mass container (2).
EP81110378A 1980-12-11 1981-12-11 Device for pressure casting Expired EP0061532B1 (en)

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AT81110378T ATE19975T1 (en) 1980-12-11 1981-12-11 DIE CASTING MACHINE.

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BG8049948A BG33467A1 (en) 1980-12-11 1980-12-11 Method and machine for castind under presure
BG49948/80 1980-12-11

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EP0061532A1 EP0061532A1 (en) 1982-10-06
EP0061532B1 true EP0061532B1 (en) 1986-05-28

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SU616061A1 (en) * 1975-02-25 1978-07-25 Научно-Исследовательский Институт Специальных Способов Литья Plant for casting with counterpressure
FR2378591A1 (en) * 1977-01-28 1978-08-25 Buscher Kg ELEVATOR DUCT FOR THE CASTING OF METALS UNDER THE PRESSURE OF A GAS
DE2947602A1 (en) * 1979-10-30 1981-05-14 BBC AG Brown, Boveri & Cie., Baden, Aargau Low pressure casting plant for metals prone to oxidn. - where plant is filled with inert gas, which is also used to drive metal up stand pipe into mould

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NO814223L (en) 1982-06-14
BG33467A1 (en) 1983-03-15
NO157326B (en) 1987-11-23
NO157326C (en) 1988-03-02
AU550563B2 (en) 1986-03-27
EP0061532A1 (en) 1982-10-06
YU43907B (en) 1989-12-31
ES8307557A1 (en) 1983-07-01
CS271101B2 (en) 1990-08-14
JPS57127568A (en) 1982-08-07
PL234128A1 (en) 1982-08-02
CA1181923A (en) 1985-02-05
RO84863B (en) 1984-09-30
US4550763A (en) 1985-11-05
PL132008B1 (en) 1985-01-31
DD202253A5 (en) 1983-09-07
HU185073B (en) 1984-11-28
ATE19975T1 (en) 1986-06-15
YU282881A (en) 1984-08-31
BR8108037A (en) 1982-09-21
AR230012A1 (en) 1984-02-29
RO84863A (en) 1984-08-17
DK152178B (en) 1988-02-08
SU1287976A1 (en) 1987-02-07
ES507780A0 (en) 1983-07-01
IN156285B (en) 1985-06-15
DK152178C (en) 1988-06-27
JPH0238305B2 (en) 1990-08-29
AU7845581A (en) 1982-06-17
DK550981A (en) 1982-06-12
DE3174743D1 (en) 1986-07-03

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