[go: up one dir, main page]

EP0037125B1 - Arrangement for die casting metals and alloys - Google Patents

Arrangement for die casting metals and alloys Download PDF

Info

Publication number
EP0037125B1
EP0037125B1 EP81102472A EP81102472A EP0037125B1 EP 0037125 B1 EP0037125 B1 EP 0037125B1 EP 81102472 A EP81102472 A EP 81102472A EP 81102472 A EP81102472 A EP 81102472A EP 0037125 B1 EP0037125 B1 EP 0037125B1
Authority
EP
European Patent Office
Prior art keywords
gas
press
chamber
die
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP81102472A
Other languages
German (de)
French (fr)
Other versions
EP0037125A1 (en
Inventor
Stantscho Christov Dipl.-Ing. Vutov
Raschko Rajkov Dipl.-Ing. Slavov
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.)
INSTITUT PO METALOSNANIE I TECHNOLOGIA NA METALITE
Original Assignee
INSTITUT PO METALOSNANIE I TECHNOLOGIA NA METALITE
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 INSTITUT PO METALOSNANIE I TECHNOLOGIA NA METALITE filed Critical INSTITUT PO METALOSNANIE I TECHNOLOGIA NA METALITE
Priority to AT81102472T priority Critical patent/ATE4967T1/en
Publication of EP0037125A1 publication Critical patent/EP0037125A1/en
Application granted granted Critical
Publication of EP0037125B1 publication Critical patent/EP0037125B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
    • 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
    • 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
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging

Definitions

  • the invention relates to a device for the press casting of metals and alloys using an increased gas pressure above the solidifying melt, consisting of a hydraulic press with a press cylinder, a piston which divides the cylinder into two spaces which are connected to the hydraulic system of the press , and with a piston rod to which a press plate and a press mold are fastened, at least one gas collection cavity being formed in the press mold and connected to a gas container by shut-off elements.
  • the press mold is connected to a press piston by means of a pneumatic piston which is arranged in a pneumatic cylinder, the compression space in front of the pneumatic piston being connected to the press mold cavities, to which compressed gas is supplied by gas lines and at least one adjustable check valve is supplied, which opens in the direction from the compression space in front of the pneumatic piston to the mold cavities (Bulg. Pat. No. 21 077).
  • This device has the disadvantage that the usable stroke is shortened due to the installation of an additional element, namely a pneumatic cylinder with piston between the plunger and the die, that the die is unsafe during operation due to its movable connection with the plunger and that the mold must first be closed before the gas can be compressed.
  • an additional element namely a pneumatic cylinder with piston between the plunger and the die
  • Another known device for press casting using an increased gas pressure has a specialized hydraulic press with separate devices for closing the press mold and for pressing.
  • the device is provided with an independent hydro-pneumatic multiplier, which is arranged in the press piston and is connected to a gas container and to the press mold cavity by means of corresponding shut-off elements. After the mold has been closed, the multiplier is operated at a special command to increase the pressure of the gas in the mold cavity to the required value.
  • This device has the disadvantage that it has a very complicated construction and does not allow the use of a high gas pressure immediately after the mold has been closed.
  • the invention has for its object to design the device of the type mentioned so that the compression of the gas take place automatically during the idle stroke (free stroke of the piston during its working stroke) of the press and a high gas pressure on the solidifying melt immediately after closing the Press mold can be exercised.
  • a chamber is formed in the piston rod which is filled to a certain level with operating fluid from the hydraulic system of the press.
  • the lower part of this chamber is connected to the space of the press cylinder below the piston. This space is in turn connected to the hydraulic system of the press via a shut-off element.
  • the upper part of the chamber is simultaneously connected to the gas container via a check valve and to the mold cavity via a shut-off valve.
  • the mold cavity is in turn connected to the atmosphere via another shut-off valve.
  • the device according to the invention has the advantage that the development of systems for compressing the gas in each mold is eliminated and a maximum gas pressure can be exerted immediately after the mold is closed.
  • a movable partition can advantageously be arranged in the chamber between the operating liquid and the gas.
  • the device consists of a press cylinder 1 with a press piston 2 arranged therein, which has a piston rod 3.
  • a press plate 14 and a press mold 15 are fastened to the piston rod 3.
  • the piston 2 and the cylinder 1 are sealed from one another by means of ring-shaped sealing elements 6.
  • the piston rod 3 and the cylinder 1 are sealed by sealing elements 12.
  • the space 4 above the piston 2 is connected to the hydraulic system of the press by means of a pipeline 5.
  • the space 8 of the press cylinder 1 below the piston 2 is connected to the hydraulic system of the press via a shut-off element 10.
  • a chamber 9 is formed in the piston rod 3, which is filled up to a certain level with operating fluid 13 from the hydraulic system of the press. The rest of the chamber 9 is filled with gas 24.
  • the lower part of the chamber 9 is connected via a pipe 11 and a channel 7 to the space 8 below the piston 2.
  • the upper part of the chamber 9 is connected via a pipe 23 at the same time via a check valve 21 to the gas container 22, via a shut-off valve 18 to the cavity 16 of the mold 15 and via an adjustable check valve 19 to the atmosphere.
  • the cavity 16 of the mold 15 is in turn connected to the atmosphere via a shut-off valve 17.
  • the chamber 9 is connected to a manometer 20 for checking the gas pressure.
  • the valve 18 is closed.
  • the valve 17 for releasing the gas remaining in the die into the atmosphere is opened.
  • a command is given for the plunger reverse stroke, i.e. the pressure in room 4 is reduced by connecting pipeline 5 to the press container.
  • the piston, together with the die 15 moves upwards under the action of the pressure of the gas in the chamber 9, the operating liquid 13 running back into the space 8 below the piston.
  • the piston 2 moves further downward, with an additional quantity of gas flowing from the gas container 22 through the check valve 21 into the chamber 9, as a result of which the device returns to the starting position.
  • the device according to the invention operates as a normal hydraulic press.
  • a movable partition 25 is arranged in the chamber 9 between the operating liquid 13 and the gas 24, which is designed as a floating piston, which is sealed to the wall of the chamber 9 by means of annular sealing elements 26. In this way, direct contact between gas and operating fluid is avoided and the risk of possible interaction is eliminated.
  • the movable partition is designed as an elastic membrane 27 which is fixedly attached to the chamber 9.

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Presses And Accessory Devices Thereof (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Lead Frames For Integrated Circuits (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Steroid Compounds (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

The invention relates to an apparatus for pressure die casting of metals and alloys involving the action of increased gas pressure on the solidifying melt. In this apparatus, the gas is pressurized automatically during the stroke of the press and pressurized gas at elevated pressure is applied to molten metal in the die cavity immediately after the closing of the die. For this purpose, the apparatus comprises a hydraulic press including a cylinder and a piston slidably mounted therein, which piston divides the cylinder into a first and second chamber. The first chamber is in communication with a source of pressurized liquid and the second chamber is in communication with a gas retaining cavity disposed in the piston rod of the piston. A press plate and die having at least one die cavity is rigidly mounted on the piston rod. The cavity of the die is connected by means of corresponding valves to a supply reservoir with gas under low pressure. The gas retaining cavity within the piston rod is filled up to a fixed level with working liquid from the hydraulic system of the press. The bottom part of this cavity is connected to the second chamber of the pressing cylinder below the piston. This second chamber is connected to the hydraulic system of the press by means of a valve. The upper part of the gas retaining cavity is connected simultaneously by means of a check valve to a supply reservoir for gas and by means of a shut-off valve to the die cavity. The die cavity is connected by means of another shut-off valve to the atmosphere.

Description

Die Erfindung betrifft eine Vorrichtung zum Pressgiessen von Metallen und Legierungen unter Anwendung eines erhöhten Gasdrucks über der erstarrenden Schmelze, bestehend aus einer hydraulischen Presse mit einem Presszylinder, einem Kolben, der den Zylinder in zwei Räume teilt, die mit dem hydraulischen System der Presse verbunden sind, und mit einer Kolbenstange, an der eine Pressplatte und eine Pressform befestigt sind, wobei in der Pressform mindestens ein Gassammelhohlraum ausgebildet ist, der durch Absperrelemente mit einem Gasbehälter verbunden ist.The invention relates to a device for the press casting of metals and alloys using an increased gas pressure above the solidifying melt, consisting of a hydraulic press with a press cylinder, a piston which divides the cylinder into two spaces which are connected to the hydraulic system of the press , and with a piston rod to which a press plate and a press mold are fastened, at least one gas collection cavity being formed in the press mold and connected to a gas container by shut-off elements.

Bei einer bekannten Vorrichtung zum Pressgiessen von Metallen und Legierungen ist die Pressform mit einem Presskolben mittels eines pneumatischen Kolbens verbunden, welcher in einem pneumatischen Zylinder angeordnet ist, wobei der Kompressionsraum vor dem pneumatischen Kolben mit den Pressformhohlräumen verbunden ist, denen Druckgas durch Gasleitungen und mindestens ein regulierbares Rückschlagventil zugeführt wird, das sich in Richtung von dem Kompressionsraum vor dem pneumatischen Kolben zu den Pressformhohlräumen hin öffnet (Bulg. Pat. Nr. 21 077).In a known device for the press-casting of metals and alloys, the press mold is connected to a press piston by means of a pneumatic piston which is arranged in a pneumatic cylinder, the compression space in front of the pneumatic piston being connected to the press mold cavities, to which compressed gas is supplied by gas lines and at least one adjustable check valve is supplied, which opens in the direction from the compression space in front of the pneumatic piston to the mold cavities (Bulg. Pat. No. 21 077).

Diese Vorrichtung hat den Nachteil, dass der nutzbare Hub infolge des Einbaus eines zusätzlichen Elements, nämlich eines pneumatischen Zylinders mit Kolben zwischen dem Presskolben und der Pressform, verkürzt wird, dass die Pressform während des Betriebs infolge ihrer beweglichen Verbindung mit dem Presskolben unsicher geführt ist und dass die Pressform zuerst geschlossen werden muss, ehe das Gas komprimiert werden kann.This device has the disadvantage that the usable stroke is shortened due to the installation of an additional element, namely a pneumatic cylinder with piston between the plunger and the die, that the die is unsafe during operation due to its movable connection with the plunger and that the mold must first be closed before the gas can be compressed.

Eine andere bekannte Vorrichtung zum Pressgiessen unter Anwendung eines erhöhten Gasdrucks hat eine spezialisierte hydraulische Presse mit separaten Einrichtungen für das Schliessen der Pressform und für das Pressen. Die Vorrichtung ist mit einem unabhängigen hydro-pneumatischen Multiplikator versehen, der im Presskolben angeordnet ist und mittels entsprechender Absperrelemente mit einem Gasbehälter und mit dem Pressformhohlraum verbunden ist. Nach dem Schliessen der Pressform erfolgt auf besonderen Befehl das Betätigen des Multiplikators zur Erhöhung des Drucks des Gases im Pressformhohlraum bis auf den erforderlichen Wert.Another known device for press casting using an increased gas pressure has a specialized hydraulic press with separate devices for closing the press mold and for pressing. The device is provided with an independent hydro-pneumatic multiplier, which is arranged in the press piston and is connected to a gas container and to the press mold cavity by means of corresponding shut-off elements. After the mold has been closed, the multiplier is operated at a special command to increase the pressure of the gas in the mold cavity to the required value.

Diese Vorrichtung hat den Nachteil, dass sie sehr kompliziert gebaut ist und die Anwendung eines hohen Gasdrucks unmittelbar nach dem Schliessen der Pressform nicht zulässt.This device has the disadvantage that it has a very complicated construction and does not allow the use of a high gas pressure immediately after the mold has been closed.

Der Erfindung liegt die Aufgabe zugrunde, die Vorrichtung der eingangs genannten Art so auszubilden, dass das Komprimieren des Gases automatisch während des Leerhubs (freies Hub des Kolbens während seines Arbeitshubs) der Presse erfolgen und ein hoher Gasdruck auf die erstarrende Schmelze unmittelbar nach dem Schliessen der Pressform ausgeübt werden kann.The invention has for its object to design the device of the type mentioned so that the compression of the gas take place automatically during the idle stroke (free stroke of the piston during its working stroke) of the press and a high gas pressure on the solidifying melt immediately after closing the Press mold can be exercised.

Diese Aufgabe wird bei der Vorrichtung der eingangs genannten Art erfindungsgemäss dadurch gelöst, dass in der Kolbenstange eine Kammer ausgebildet ist, die bis zu einem bestimmten Niveau mit Betriebsflüssigkeit vom hydraulischen System der Presse gefüllt ist. Der untere Teil dieser Kammer ist mit dem Raum des Presszylinders unterhalb des Kolbens verbunden. Dieser Raum ist seinerseits mit dem hydraulischen System der Presse über ein Absperrelement verbunden. Der obere Teil der Kammer ist gleichzeitig über ein Rückschlagventil mit dem Gasbehälter und über ein Absperrventil mit dem Pressformhohlraum verbunden. Der Pressformhohlraum ist seinerseits über ein anderes Absperrventil mit der Atmosphäre verbunden.This object is achieved according to the invention in the device of the type mentioned at the outset in that a chamber is formed in the piston rod which is filled to a certain level with operating fluid from the hydraulic system of the press. The lower part of this chamber is connected to the space of the press cylinder below the piston. This space is in turn connected to the hydraulic system of the press via a shut-off element. The upper part of the chamber is simultaneously connected to the gas container via a check valve and to the mold cavity via a shut-off valve. The mold cavity is in turn connected to the atmosphere via another shut-off valve.

Die erfindungsgemässe Vorrichtung hat den Vorteil, dass die Entwicklung von Systemen für das Komprimieren des Gases in jeder Pressform entfällt und ein maximaler Gasdruck unmittelbar nach dem Schliessen der Pressform ausgeübt werden kann.The device according to the invention has the advantage that the development of systems for compressing the gas in each mold is eliminated and a maximum gas pressure can be exerted immediately after the mold is closed.

Vorteilhafterweise kann zwischen der Betriebsflüssigkeit und dem Gas in der Kammer eine bewegliche Trennwand angeordnet sein.A movable partition can advantageously be arranged in the chamber between the operating liquid and the gas.

Anhand der Zeichnungen wird die Erfindung beispielsweise näher erläutert. Es zeigen:

  • Fig. 1 eine erste Ausführungsform der Vorrichtung im Längsschnitt;
  • Fig. 2 und
  • Fig. 3 in Längsschnitten eine zweite und dritte Ausführungsform der Vorrichtung.
The invention is explained in more detail, for example, with reference to the drawings. Show it:
  • Figure 1 shows a first embodiment of the device in longitudinal section.
  • Fig. 2 and
  • Fig. 3 in longitudinal sections a second and third embodiment of the device.

Die Vorrichtung besteht aus einem Presszylinder 1 mit einem darin angeordneten Presskolben 2, der eine Kolbenstange 3 hat. An der Kolbenstange 3 sind eine Pressplatte 14 und eine Pressform 15 befestigt. Der Kolben 2 und der Zylinder 1 sind untereinander mittels ringförmiger Dichtungselemente 6 abgedichtet. Die Kolbenstange 3 und der Zylinder 1 sind durch Dichtungselemente 12 abgedichtet. Der Raum 4 oberhalb des Kolbens 2 ist mittels einer Rohrleitung 5 mit dem hydraulischen System der Presse verbunden. Der Raum 8 des Presszylinders 1 unterhalb des Kolbens 2 ist über ein Absperrelement 10 mit dem hydraulischen System der Presse verbunden. In der Kolbenstange 3 ist eine Kammer 9 ausgebildet, die bis zu einem bestimmten Niveau mit Betriebsflüssigkeit 13 aus dem hydraulischen System der Presse gefüllt ist. Der übrige Teil der Kammer 9 ist mit Gas 24 gefüllt. Der untere Teil der Kammer 9 ist über ein Rohr 11 und einen Kanal 7 mit dem Raum 8 unterhalb des Kolbens 2 verbunden. Der obere Teil der Kammer 9 ist über ein Rohr 23 gleichzeitig über ein Rückschlagventil 21 mit dem Gasgbehälter 22, über ein Absperrventil 18 mit dem Hohlraum 16 der Pressform 15 und über ein regulierbares Rückschlagventil 19 mit der Atmosphäre verbunden. Der Hohlraum 16 der Pressform 15 ist seinerseits über ein Absperrventil 17 mit der Atmosphäre verbunden. Die Kammer 9 ist mit einem Manometer 20 für die Kontrolle des Gasdrucks verbunden.The device consists of a press cylinder 1 with a press piston 2 arranged therein, which has a piston rod 3. A press plate 14 and a press mold 15 are fastened to the piston rod 3. The piston 2 and the cylinder 1 are sealed from one another by means of ring-shaped sealing elements 6. The piston rod 3 and the cylinder 1 are sealed by sealing elements 12. The space 4 above the piston 2 is connected to the hydraulic system of the press by means of a pipeline 5. The space 8 of the press cylinder 1 below the piston 2 is connected to the hydraulic system of the press via a shut-off element 10. A chamber 9 is formed in the piston rod 3, which is filled up to a certain level with operating fluid 13 from the hydraulic system of the press. The rest of the chamber 9 is filled with gas 24. The lower part of the chamber 9 is connected via a pipe 11 and a channel 7 to the space 8 below the piston 2. The upper part of the chamber 9 is connected via a pipe 23 at the same time via a check valve 21 to the gas container 22, via a shut-off valve 18 to the cavity 16 of the mold 15 and via an adjustable check valve 19 to the atmosphere. The cavity 16 of the mold 15 is in turn connected to the atmosphere via a shut-off valve 17. The chamber 9 is connected to a manometer 20 for checking the gas pressure.

Die Vorrichtung arbeitet folgendermassen:

  • In der Ausgangsstellung sind das Absperrelement 10 und die Absperrventile 17 und 18 geschlossen. Nach dem Erzeugen eines Drucks im Raum 4 des Zylinders 1 beginnt die Abwärtsbewegung des Kolbens 2, wobei die Betriebsflüssigkeit von Raum 8 unterhalb des Kolbens durch den Kanal 7 und das Rohr 11 in die Kammer 9 gefördert wird, wodurch eine Verminderung des Volumens bzw. eine Erhöhung des Drucks des dort befindlichen Gases 24 hervorgerufen wird. Dieser Vorgang dauert fort, bis der Druck in der Kammer 9 und im Raum 8 unterhalb des Kolbens den durch die Einstellung des regulierbaren Rückschlagventils 19 bestimmten Wert erreicht. Bei der weiteren Abwärtsbewegung des Kolbens 2 wird der Druck nicht erhöht, da ein Teil des Gases 24 durch das Sicherheitsventil 19 in die Atmosphäre ausgelassen wird. Nach dem Schliessen der Pressform wird durch Öffnen des Absperrventils 18 Druckgas in den Hohlraum 16 eingeführt.
The device works as follows:
  • In the starting position, the shut-off element 10 and the shut-off valves 17 and 18 are closed. After a pressure has been generated in the chamber 4 of the cylinder 1, the piston 2 begins to move downwards, the operating fluid being conveyed from the chamber 8 below the piston through the channel 7 and the pipe 11 into the chamber 9, thereby reducing the volume or Increasing the pressure of the gas 24 located there is caused. This process continues until the pressure in the chamber 9 and in the space 8 below the piston reaches the value determined by the adjustment of the adjustable check valve 19. During the further downward movement of the piston 2, the pressure is not increased, since part of the gas 24 is released into the atmosphere through the safety valve 19. After the mold has been closed, compressed gas is introduced into the cavity 16 by opening the shut-off valve 18.

Nach dem Erstarren des Pressteils in der Pressform wird das Ventil 18 geschlossen. Das Ventil 17 für das Auslassen des in der Pressform übriggebliebenen Gases in die Atmosphäre wird geöffnet. Es wird ein Befehl für den Rückwärtshub des Presskolbens gegeben, d.h. der Druck im Raum 4 wird abgebaut, indem die Rohrleitung 5 mit dem Behälter der Presse verbunden wird. Zuerst bewegt sich der Kolben zusammen mit der Pressform 15 aufwärts unter der Wirkung des Drucks des Gases in der Kammer 9, wobei die Betriebsflüssigkeit 13 zurück in den Raum 8 unterhalb des Kolbens läuft. Nach dem Ausgleich des Drucks in der Kammer 9 und im Gasbehälter 22 erfolgt die weitere Abwärtsbewegung des Kolbens 2, wobei eine zusätzliche Gasmenge vom Gasbehälter 22 durch das Rückschlagventil 21 in die Kammer 9 strömt, wodurch die Vorrichtung in die Ausgangsstellung zurückkommt.After the press part has solidified in the press mold, the valve 18 is closed. The valve 17 for releasing the gas remaining in the die into the atmosphere is opened. A command is given for the plunger reverse stroke, i.e. the pressure in room 4 is reduced by connecting pipeline 5 to the press container. First, the piston, together with the die 15, moves upwards under the action of the pressure of the gas in the chamber 9, the operating liquid 13 running back into the space 8 below the piston. After the pressure in the chamber 9 and in the gas container 22 has been equalized, the piston 2 moves further downward, with an additional quantity of gas flowing from the gas container 22 through the check valve 21 into the chamber 9, as a result of which the device returns to the starting position.

Wenn das Absperrelement 10 geöffnet und die Verbindung zwischen der Kammer 9 und dem Gasbehälter 22 unterbrochen wird, arbeitet die erfindungsgemässe Vorrichtung als normale hydraulische Presse.When the shut-off element 10 is opened and the connection between the chamber 9 and the gas container 22 is interrupted, the device according to the invention operates as a normal hydraulic press.

Bei der zweiten Ausführungsform von Fig. 2 ist in der Kammer 9 zwischen der Betriebsflüssigkeit 13 und dem Gas 24 eine bewegliche Trennwand 25 angeordnet, die als schwebender Kolben ausgeführt ist, der an der Wand der Kammer 9 mittels ringförmiger Dichtungselemente 26 abgedichtet ist. Auf diese Weise wird der direkte Kontakt zwischen Gas und Betriebsflüssigkeit vermieden und die Gefahr einer eventuellen Wechselwirkung beseitigt.In the second embodiment of FIG. 2, a movable partition 25 is arranged in the chamber 9 between the operating liquid 13 and the gas 24, which is designed as a floating piston, which is sealed to the wall of the chamber 9 by means of annular sealing elements 26. In this way, direct contact between gas and operating fluid is avoided and the risk of possible interaction is eliminated.

In der dritten Ausführungsform von Fig. 3 ist die bewegliche Trennwand als eine elastische Membrane 27 ausgeführt, die fest an der Kammer 9 befestigt ist.In the third embodiment of Fig. 3, the movable partition is designed as an elastic membrane 27 which is fixedly attached to the chamber 9.

Claims (2)

1. An apparatus for squeeze casting of metals and alloys involving the use of increased gas pressure on the solidifying melt, comprising a hydraulic press with pressing cylinder (1) with piston (2), dividing the cylinder in two spaces connected to the hydraulic system of the press, and a piston rod (3) to which a press plate (14) and a die (15) are fastened, the latter comprising at least one gas-collecting cavity (16), connected by means of respective valves (18) to a supply reservoir for gas (22), wherein inside the piston rod (3) there is formed a chamber (9), which is filled up to a fixed level with working liquid (13), and the bottom part of the chamber is connected to the hydraulic system of the press by means of a valve (10), while the upper part of chamber (9) is connected simultaneously by means of a check valve (21) to the gas supply reservoir (22) and by means of valve (18) - to the cavity (16) of the die (15), and this cavity (16) is connected by means of a valve (17) to the atmosphere.
2. An apparatus according to claim 1, wherein between the working liquid (13) and the gas (24) within the chamber (9) there is provided a movable partition (25).
EP81102472A 1980-04-02 1981-04-01 Arrangement for die casting metals and alloys Expired EP0037125B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81102472T ATE4967T1 (en) 1980-04-02 1981-04-01 DEVICE FOR PRESSURE CASTING OF METALS AND ALLOYS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BG47207/80 1980-04-02
BG8047207A BG31832A1 (en) 1980-04-02 1980-04-02 Method for liquid or semi- liquid stamping

Publications (2)

Publication Number Publication Date
EP0037125A1 EP0037125A1 (en) 1981-10-07
EP0037125B1 true EP0037125B1 (en) 1983-10-12

Family

ID=3907300

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81102472A Expired EP0037125B1 (en) 1980-04-02 1981-04-01 Arrangement for die casting metals and alloys

Country Status (10)

Country Link
US (1) US4393916A (en)
EP (1) EP0037125B1 (en)
JP (1) JPS5717365A (en)
AT (1) ATE4967T1 (en)
BG (1) BG31832A1 (en)
CS (1) CS231982B2 (en)
DD (1) DD160894A5 (en)
DE (1) DE3161158D1 (en)
IN (1) IN154994B (en)
SU (1) SU1150054A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2535231B1 (en) * 1982-10-27 1987-01-23 Inst Po Metalloznanie I Tekno PNEUMATIC PISTON PROCESS FOR THE CASTING OF METALS AND OTHER MATERIALS, AND EQUIPMENT FOR THE PRODUCTION THEREOF
JPS607211A (en) * 1983-06-24 1985-01-16 Nec Corp Differential amplifier circuit
JPS60160209A (en) * 1984-01-31 1985-08-21 Fujitsu Ltd Fet differential amplifier circuit
RU2221079C2 (en) * 2001-10-26 2004-01-10 Ульяновский государственный технический университет Cathode of electric-arc evaporator and method of production of such cathode
CN104942261A (en) * 2014-03-25 2015-09-30 苏州慧驰轻合金精密成型科技有限公司 Novel piston extrusion casting machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2010181B2 (en) * 1969-03-04 1971-06-09 PRESS MECHANISM IN DIE CASTING MACHINES WITH HYDRAULIC DRIVE
DE1583631B2 (en) * 1967-11-10 1975-03-20 Badische Maschinenfabrik Gmbh, 7500 Karlsruhe Press-in device for hydraulically operated die casting machines
DE2355594A1 (en) * 1973-11-07 1975-05-15 Valentin Emmerich Pressure casting machine control - has high pressure booster with stepped piston for finishing pressure phase accumulator
DE2450805B2 (en) * 1973-10-29 1976-12-30 Societe de Vente de T Aluminium Pechiney, Paris DIE CASTING PROCESS FOR NEON METALS AND NF ALLOYS AND DEVICE FOR ITS IMPLEMENTATION
DE2747066B1 (en) * 1977-10-20 1979-03-15 Weingarten Ag Maschf Device for setting the plunger speeds and pressures in die casting machines with a three-phase system, in particular in cold chamber die casting machines
DE2854075B1 (en) * 1978-12-14 1980-01-17 Weingarten Ag Maschf Die casting machine with a press piston which can be displaced in a press cylinder and a pressure multiplier for generating an increased pressure in the press cylinder work space towards the end of the working stroke of the press piston

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH607755A5 (en) * 1974-08-30 1978-10-31 Inst Po Metalloznanie I Tekno
US3960201A (en) * 1974-12-13 1976-06-01 Societe De Vente De L'aluminium Pechiney Injection device for molding machines
JPS5852743B2 (en) * 1976-02-04 1983-11-25 トヨタ自動車株式会社 Molten metal forging mold equipment
US4154288A (en) * 1977-11-02 1979-05-15 Arrow-Acme Corporation Injection molding machine having swivel shot tip assembly
CH635255A5 (en) * 1978-07-19 1983-03-31 Buehler Ag Geb DIE CASTING MACHINE.
US4334575A (en) * 1980-03-18 1982-06-15 Nippon Light Metal Co., Ltd. Method for cooling a plunger tip in a die casting machine of the cold chamber type and apparatus therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1583631B2 (en) * 1967-11-10 1975-03-20 Badische Maschinenfabrik Gmbh, 7500 Karlsruhe Press-in device for hydraulically operated die casting machines
DE2010181B2 (en) * 1969-03-04 1971-06-09 PRESS MECHANISM IN DIE CASTING MACHINES WITH HYDRAULIC DRIVE
DE2450805B2 (en) * 1973-10-29 1976-12-30 Societe de Vente de T Aluminium Pechiney, Paris DIE CASTING PROCESS FOR NEON METALS AND NF ALLOYS AND DEVICE FOR ITS IMPLEMENTATION
DE2355594A1 (en) * 1973-11-07 1975-05-15 Valentin Emmerich Pressure casting machine control - has high pressure booster with stepped piston for finishing pressure phase accumulator
DE2747066B1 (en) * 1977-10-20 1979-03-15 Weingarten Ag Maschf Device for setting the plunger speeds and pressures in die casting machines with a three-phase system, in particular in cold chamber die casting machines
DE2854075B1 (en) * 1978-12-14 1980-01-17 Weingarten Ag Maschf Die casting machine with a press piston which can be displaced in a press cylinder and a pressure multiplier for generating an increased pressure in the press cylinder work space towards the end of the working stroke of the press piston

Also Published As

Publication number Publication date
CS231982B2 (en) 1985-01-16
BG31832A1 (en) 1982-04-15
US4393916A (en) 1983-07-19
ATE4967T1 (en) 1983-10-15
IN154994B (en) 1984-12-22
DD160894A5 (en) 1984-06-13
EP0037125A1 (en) 1981-10-07
CS239581A2 (en) 1984-01-16
SU1150054A1 (en) 1985-04-15
DE3161158D1 (en) 1983-11-17
JPS5717365A (en) 1982-01-29

Similar Documents

Publication Publication Date Title
DE2818337C2 (en) Hydropneumatic pressure intensifier
DE2851070B2 (en) Device for relieving the seal package of a piston rod of a hydraulic telescopic shock absorber
DE2146502C3 (en) Valve arrangement for setting hydraulic pit rams with high setting force
DE2107478A1 (en) Brake valve for a hydraulic brake system
EP0037125B1 (en) Arrangement for die casting metals and alloys
DE3218527C2 (en)
EP0203322B1 (en) Apparatus for compacting a foundry moulding material by means of compressed gas
DE2615627A1 (en) COMPRESSOR
EP0152573B1 (en) Apparatus for compacting foundry-moulding material using pressure gas
DE19853711C5 (en) Hydropneumatic pressure intensifier
DE1680818C3 (en) Brake pressure reducer for a hydraulic motor vehicle brake system
DE3039200C2 (en) Adjusting device for a power unit
DE909795C (en) Control for working pistons of hydraulic presses
DE2522800A1 (en) PROCESS AND DEVICE FOR LIMITING THE REPRINTING AFTER THE MOLD FILLING PHASE DURING THE DIE-CASTING OF METALS
DE81188C (en)
DE507867C (en) Hydraulic device for chuck
DE1021481B (en) Closure on the receiver of extrusion presses, especially those for the production of carbon electrodes
DE970492C (en) Pressure reducing valve for a hydraulically operated pit ram
DE19436C (en) Innovations in braking devices for railway wagons
DE2048281C3 (en) Device for compacting powdery material
DE3125598A1 (en) DEVICE FOR PRESSURIZING THE PRESSING CYLINDER OF A PRESSURE CASTING MACHINE
DE1605264C3 (en) Compressed air brake system for rail vehicles with a pressure booster, an anti-skid controller and a speed-dependent controller
DE1920181A1 (en) Hydraulic ram device
DE262013C (en) Brake accelerator on control valves
DE810768C (en) Hydraulic fluid braking system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT SE

17P Request for examination filed

Effective date: 19811006

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT CH DE FR GB IT LI SE

REF Corresponds to:

Ref document number: 4967

Country of ref document: AT

Date of ref document: 19831015

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3161158

Country of ref document: DE

Date of ref document: 19831117

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 19840224

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840331

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19840424

Year of fee payment: 4

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19840628

Year of fee payment: 4

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860217

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19880401

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19880430

Ref country code: CH

Effective date: 19880430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881118

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19890103

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19890402

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19891228

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

EUG Se: european patent has lapsed

Ref document number: 81102472.8

Effective date: 19900412