EP0186002A1 - Apparatus for preventing pressure peaks in a pressure device of a die-casting machine - Google Patents

Apparatus for preventing pressure peaks in a pressure device of a die-casting machine Download PDF

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Publication number
EP0186002A1
EP0186002A1 EP85115502A EP85115502A EP0186002A1 EP 0186002 A1 EP0186002 A1 EP 0186002A1 EP 85115502 A EP85115502 A EP 85115502A EP 85115502 A EP85115502 A EP 85115502A EP 0186002 A1 EP0186002 A1 EP 0186002A1
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Prior art keywords
pressure
phase
press
plunger
piston
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EP85115502A
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German (de)
French (fr)
Inventor
Friedrich Georg Stummer
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Mahle GmbH
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Mahle GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/20—Accessories: Details
    • B22D17/32—Controlling equipment

Definitions

  • the invention relates to a device for preventing pressure peaks in the press unit of a die casting machine according to the preamble of claim 1.
  • Such devices are e.g. B. from EP 0 068 147 B1 or DE-OS 30 14 868 known.
  • the object of the invention is to create a pressure-limiting device which is simple and uncomplicated in terms of structure and which directly adjoins the pressure space in front of the plunger and which responds with almost no inertia and as little mass as possible.
  • this device is only intended to briefly relieve the pressure peaks exceeding the desired holding pressure during the transition to the holding pressure phase (third phase), while the desired one Reprint should be maintained even by an independent pressure relief device, as are known in the prior art.
  • Press cylinder and plunger of the casting machine are designated 1 and 4.
  • the valves 2, 3, 5 and 6 and the lines leading to the press cylinder 1 are used essentially only for carrying out the first working phase, as well as for returning the press piston and emptying a compensating cylinder 8b.
  • Only the valve 5 also performs a function in the mold filling phase (working phase 2) and holding pressure phase (third working phase) in that it ensures a rapid drain of the hydraulic fluid from the press cylinder.
  • the valve 3, on the other hand, only ensures at the end of the mold filling phase and the holding pressure phase that the line opening from the pressure side of the plunger 4 is closed.
  • a high-pressure accumulator 7a, 7b and an equalizing accumulator 8a, 8b open into a common supply line to the press cylinder 1 and can be separated from one another in this line by a valve 9.
  • the high-pressure accumulator 7a, 7b and the Ausal.eich notes 8a, 8b each consist of a cylinder (high-pressure cylinder 7b or compensating cylinder 8b), each with a displaceable piston 10 or 11 and downstream pressure vessels (high-pressure container 7a or compensating container 8a) .
  • the volume of the pressure vessels 7a, 8a is designed such that the pressure level of the stored gas remains approximately constant over the entire displacement paths of the pistons 10 and 11, or changes slightly progressively in the compensating cylinder 8b.
  • the final pressure in the high-pressure accumulator 7a, 7b is built up by pushing back the piston 10 under the pressure of hydraulic fluid introduced into the high-pressure cylinder 7b.
  • the pressure in the compensating accumulator 8a, 8b is predetermined as a function of the desired holding pressure of the holding pressure phase and is below the final pressure in the high-pressure accumulator 7a, 7b.
  • the pressure setting in the expansion tank 8a is carried out by the amount of hydraulic fluid that is introduced via the individual pressure valve 12.
  • the operation of the pressurizing device is as follows.
  • the lead-up phase (first work phase) takes place with valve 9 closed and valves 2 and 3 actuated in an officially known manner.
  • the transition to the mold filling phase is initiated by opening the valve 9 provided with an adjustable throttle.
  • the piston 11 of the compensating cylinder 8b is in the position shown in the drawing.
  • the piston 10 of the high-pressure cylinder 7b now presses the hydraulic fluid under the full pressure of the high-pressure container 7a into the press cylinder 4 at the beginning of the mold-filling phase.
  • the displacement of the press piston 4 in the mold-filling phase results in the line between the press cylinder 1 and the high-pressure accumulator 7a, 7b a lower pressure than that set in the expansion tank 8a.
  • the piston 11 does not change its position during the mold filling phase.
  • the piston 11 then evades under the pressure that builds up in the press cylinder and thereby has a pressure-damping or reducing effect.
  • auxiliary piston 14 additionally inserted in the plunger.
  • This auxiliary piston 14 is mounted in a cylindrical guide 15 which is open towards the end face of the plunger 4.
  • a stop is of course provided in the region of the end face of the plunger 4 to prevent the auxiliary plunger 14 from escaping from the plunger 4.
  • the cylindrical guide 1 is closed 5 and connected via a line 16 to the compensating cylinder 8b at a location behind the piston 11 position.
  • This line 16 is movable at least in a partial area in order to be able to follow the movement of the plunger 4 to which it is connected.
  • the space of the cylindrical guide 15 closed off by the auxiliary piston 14, like the connecting line 16, is filled with the gas of the compensating cylinder 8b.
  • the line can also be filled with hydraulic fluid. Then it is only necessary to ensure that mechanical separation from the compressed gas is provided in the compensating cylinder 8b in any way known per se.
  • the movable part of the connecting line 16 can, for. B. be a dip tube.
  • the function of the auxiliary piston 14, which has a very low mass of its own, is to absorb pressure peaks occurring during the transition to the holding pressure phase immediately when they occur by giving in in the cylindrical guide 15 with respect to the gas pressure set in the compensating cylinder 8b.
  • only an extremely small displacement path of the piston 14 is required, which is in its end position which is minimally removed from the end face of the press piston until the pressure peak is inserted.
  • the auxiliary piston 14 is only intended to absorb the pressure peaks, the piston 11 arranged in the compensating cylinder 8b then ensures, through its displacement, that the desired holding pressure is maintained in the holding pressure phase.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Press Drives And Press Lines (AREA)
  • Presses And Accessory Devices Thereof (AREA)

Abstract

In a die-casting machine in which the injection part comprises a squeezing cylinder (1) with a press plunger (4) and in which the squeezing pressure required to fill the mould is provided from a high- pressure accumulator under gas pressure, damaging pressure peaks are to be avoided at the beginning of the squeezing pressure. Provided for this purpose in the press plunger (4) is an auxiliary plunger (14) which can be displaced in the axial direction of the press plunger (4) and opens freely into that front face of the press plunger (4) which faces the pressure medium. The pressure desired for the squeezing pressure is applied at that end of the auxiliary plunger (14) which faces away from the pressure medium for the press plunger (4). <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung zur Druckspitzenverhinderung in dem Preßaggregat einer Druckgießmaschine nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a device for preventing pressure peaks in the press unit of a die casting machine according to the preamble of claim 1.

Derartige Einrichtungen sind z. B. aus EP 0 068 147 B1 oder DE-OS 30 14 868 bekannt.Such devices are e.g. B. from EP 0 068 147 B1 or DE-OS 30 14 868 known.

In beiden Fällen ist die Druckspitzenbegrenzung nicht absolut befriedigend gelöst. Während bei der Einrichtung nach der DE-OS 30 14 868 ein erheblicher apparativer Aufwand mit langen Hydraulikleitungen erforderlich ist, weist die Druckspitzenbegrenzungseinrichtung nach EP 0 068 147 B1 eine gewisse Ansprechträgheit auf, die sich einerseits aus einer Anordnung entfernt von dem Preßkolben und andererseits durch große in Bewegung zu setzende Massen ergibt.In both cases the pressure peak limitation has not been solved absolutely satisfactorily. While in the device according to DE-OS 30 14 868 a considerable expenditure on equipment with long hydraulic lines is required, the pressure peak limiting device according to EP 0 068 147 B1 has a certain responsiveness, which is removed from an arrangement on the one hand by the plunger and on the other hand by large masses to be set in motion.

Hiervon ausgehend liegt der Erfindung die Aufgabe zugrunde, eine im Aufbau einfache und unkomplizierte Druckbegrenzungseinrichtung zu schaffen, die direkt an den Druckraum vor dem Preßkolben angrenzt und bei möglichst geringer eigener Masse nahezu trägheitsfrei anspricht. Dabei soll diese Einrichtung am Ende der zweiten Arbeitsphase, d. h. der Formfüllphase, beim Übergang zur Nachdruckphase (dritte Phase) lediglich die über den gewünschten Nachdruck hinausgehenden Druckspitzen kurzfristig abbauen, während der gewünschte Nachdruck selbst durch eine hiervon unabhängige Druckbegrenzungsvorrichtung, wie sie im Stand der Technik bekannt sind, aufrechterhalten werden soll.Proceeding from this, the object of the invention is to create a pressure-limiting device which is simple and uncomplicated in terms of structure and which directly adjoins the pressure space in front of the plunger and which responds with almost no inertia and as little mass as possible. At the end of the second working phase, ie the mold filling phase, this device is only intended to briefly relieve the pressure peaks exceeding the desired holding pressure during the transition to the holding pressure phase (third phase), while the desired one Reprint should be maintained even by an independent pressure relief device, as are known in the prior art.

Gelöst wird diese Aufgabe durch eine Ausbildung der Druckbegrenzungseinrichtung nach den kennzeichnenden Merkmalen des Patentanspruchs 1.This object is achieved by designing the pressure limiting device according to the characterizing features of patent claim 1.

Zweckmäßige Ausgestaltungen sind Gegenstand der Unteransprüche.Appropriate configurations are the subject of the subclaims.

Ein Ausführungsbeispiel ist in der Zeichnung in einem Fließschema dargestellt.An embodiment is shown in the drawing in a flow diagram.

Preßzylinder und Preßkolben der im übrigen nicht dargestellten Gießmaschine sind mit 1 und 4 bezeichnet. Die Ventile 2, 3, 5 und 6 sowie die damit in Verbindung stehenden zu dem Preßzylinder 1 führenden Leitungen dienen im wesentlichen nur zur Durchführung der ersten Arbeitsphase, sowie der Rückführung des Preßkolbens und dem Entleeren eines.Ausgleichzylinders 8b. Lediglich das Ventil 5 übt auch in der Formfüllphase (Arbeitsphase 2) und Nachdruckphase (dritte Arbeitsphase) ein Funktion dahingehend aus, daß es für einen schnellen Abfluß der Hydraulikflüssigkeit aus dem Preßzylinder sorgt. Das Ventil 3 sorgt dagegen bei Ablauf der Formfüllphase und der Nachdruckphase lediglich dafür, daß die von der Druckseite des Preßkolbens 4 einmündende Leitung verschlossen ist. Ein Hochdruckspeicher 7a, 7b sowie ein Ausgleichspeicher 8a, 8b münden in eine gemeinsame Zuleitung zu dem Preßzylinder 1 und sind in dieser Leitung durch ein Ventil 9 voneinander trennbar. Der Hochdruckspeicher 7a, 7b sowie der Ausal.eichspeicher 8a, 8b bestehen jeweils aus einem Zylinder (Hochdruckzylinder 7b bzw. Ausgleichzylinder 8b) mit jeweils einem darin verschiebbaren Kolben 10 bzw. 11 und nachgeschalteten Druckgefäßen (Hochdruckbehälter 7a bzw. Ausgleichsbehälter 8a).. Das Volumen der Druckbehälter 7a, 8a ist derart ausgelegt, daß das Druckniveau des gespeicherten Gases über die gesamten Verschiebewege der Kolben 10 und 11 etwa konstant bleibt, bzw. sich im Ausgleichzylinder 8b gering progressiv ändert. Der Enddruck in dem Hochdruckspeicher 7a, 7b wird durch Rückschieben des Kolbens 10 unter dem Druck von in den Hochdruckzylinder 7b eingebrachter Hydraulikflüssigkeit aufgebaut. Der Druck in dem Ausgleichsspeicher 8a, 8b wird abhängig vom gewünschten Nachdruck der Nachdruckphase vorgegeben und liegt unter dem Enddruck in dem Hochdruckspeicher 7a, 7b. Die Druckeinstellung in dem Ausgleichsbehälter 8a erfolgt durch die Hydraulikflüssigkeitsmenge, die über das Druckeinzelventil 12 eingebracht wird.Press cylinder and plunger of the casting machine, not shown in the rest, are designated 1 and 4. The valves 2, 3, 5 and 6 and the lines leading to the press cylinder 1 are used essentially only for carrying out the first working phase, as well as for returning the press piston and emptying a compensating cylinder 8b. Only the valve 5 also performs a function in the mold filling phase (working phase 2) and holding pressure phase (third working phase) in that it ensures a rapid drain of the hydraulic fluid from the press cylinder. The valve 3, on the other hand, only ensures at the end of the mold filling phase and the holding pressure phase that the line opening from the pressure side of the plunger 4 is closed. A high-pressure accumulator 7a, 7b and an equalizing accumulator 8a, 8b open into a common supply line to the press cylinder 1 and can be separated from one another in this line by a valve 9. The high-pressure accumulator 7a, 7b and the Ausal.eichspeicher 8a, 8b each consist of a cylinder (high-pressure cylinder 7b or compensating cylinder 8b), each with a displaceable piston 10 or 11 and downstream pressure vessels (high-pressure container 7a or compensating container 8a) .. The volume of the pressure vessels 7a, 8a is designed such that the pressure level of the stored gas remains approximately constant over the entire displacement paths of the pistons 10 and 11, or changes slightly progressively in the compensating cylinder 8b. The final pressure in the high-pressure accumulator 7a, 7b is built up by pushing back the piston 10 under the pressure of hydraulic fluid introduced into the high-pressure cylinder 7b. The pressure in the compensating accumulator 8a, 8b is predetermined as a function of the desired holding pressure of the holding pressure phase and is below the final pressure in the high-pressure accumulator 7a, 7b. The pressure setting in the expansion tank 8a is carried out by the amount of hydraulic fluid that is introduced via the individual pressure valve 12.

Die Arbeitsweise der Druckbeaufschlagungseinrichtung ist wie folgt.The operation of the pressurizing device is as follows.

Die Vorlaufphase (erste Arbeitsphase) erfolgt bei geschlossenem Ventil 9 und Betätigung der Ventile 2 und 3 in amtlich bekannter Weise. Der Übergang in die Formfüllphase wird durch öffnen des mit einer verstellbaren Drossel versehenen Ventils 9 eingeleitet. Zu diesem Zeitpunkt befindet sich der Kolben 11 des Ausgleichszylinders 8b in der in der Zeichnung dargestellten Lage. Der Kolben 10 des Hochdruckzylinders 7b drückt nun zu Beginn der Formfüllphase die Hydraulikflüssigkeit unter dem vollen Druck des Hochdruckbehälters 7a in den Preßzylinder auf den Preßkolben 4. Durch das Verschieben des Preßkolbens 4 in der Formfüllphase herrscht in der Leitung zwischen Preßzylinder 1 und Hochdruckspeicher 7a, 7b ein niedrigerer Druck als der in dem Ausgleichsbehälter 8a eingestellte. Dadurch verändert der Kolben 11 während der Formfüllphase seine Lage nicht. Bei einem Druckstoß am Rande der Formfüllphase bzw. während des Beginns der Nachdruckphase weicht der Kolben 11 dann unter dem sich verstärkt in dem Preßzylinder aufbauenden Druck aus und wirkt dadurch druckdämpfend bzw. abbbauend.The lead-up phase (first work phase) takes place with valve 9 closed and valves 2 and 3 actuated in an officially known manner. The transition to the mold filling phase is initiated by opening the valve 9 provided with an adjustable throttle. At this time, the piston 11 of the compensating cylinder 8b is in the position shown in the drawing. The piston 10 of the high-pressure cylinder 7b now presses the hydraulic fluid under the full pressure of the high-pressure container 7a into the press cylinder 4 at the beginning of the mold-filling phase. The displacement of the press piston 4 in the mold-filling phase results in the line between the press cylinder 1 and the high-pressure accumulator 7a, 7b a lower pressure than that set in the expansion tank 8a. As a result, the piston 11 does not change its position during the mold filling phase. In the event of a pressure surge at the edge of the mold filling phase or during the start of the After the holding pressure phase, the piston 11 then evades under the pressure that builds up in the press cylinder and thereby has a pressure-damping or reducing effect.

Bedingt durch die relativ große Masse des Kolbens 11 und seine Lage senkrecht zu der auf den Preßkolben 4 führenden Druckflüssigkeit lassen sich. beim Übergang zur Nachdruckphase auftretende Druckspitzen häufig nicht ausreichend sicher vermeiden.Due to the relatively large mass of the piston 11 and its position perpendicular to the pressure fluid leading to the plunger 4 can be. Avoiding pressure peaks occurring during the transition to the holding pressure phase is often not sufficiently safe.

Dies ist jedoch mit dem zusätzlich in den Preßkolben eingesetzten Hilfskolben 14 möglich. Dieser Hilfskolben 14 ist in einer zylindrischen Führung 15, die zur Stirnfläche des Preßkolbens 4 hin offen ist,gelagert. Im Bereich der Stirnfläche des Preßkolbens 4 ist zur Verhinderung eines Austritts des Hilfskolbens 14 aus dem Preßkolben 4 selbstverständlich ein Anschlag vorgesehen. An ihrem gegenüberliegenden Ende ist die zylindrische Führung 15 geschlossen und über eine Leitung 16 mit dem Ausgleichzylinder 8b an einer hinter dem Kolben 11 gelegenen Stelle verbunden. Zumindest in einem Teilbereich ist diese Leitung 16 beweglich, um der Bewegung des Preßkolbens 4, an die sie angeschlossen ist, folgen zu können.However, this is possible with the auxiliary piston 14 additionally inserted in the plunger. This auxiliary piston 14 is mounted in a cylindrical guide 15 which is open towards the end face of the plunger 4. A stop is of course provided in the region of the end face of the plunger 4 to prevent the auxiliary plunger 14 from escaping from the plunger 4. At its opposite end, the cylindrical guide 1 is closed 5 and connected via a line 16 to the compensating cylinder 8b at a location behind the piston 11 position. This line 16 is movable at least in a partial area in order to be able to follow the movement of the plunger 4 to which it is connected.

Der durch den Hilfskolben 14 abgeschlossene Raum der zylindrischen Führung 15 ist ebenso wie die Verbindungsleitung 16 mit dem Gas des Ausgleichszylinders 8b gefüllt. Selbstverständlich kann die Leitung auch mit Hydraulikflüssigkeit gefüllt sein. Dann muß lediglich dafür Sorge getragen werden, daß auf irgendeine an sich bekannte Weise eine mechanische Trennung gegenüber dem Druckgas in dem Ausgleichszylinder 8b vorgesehen ist. Der bewegliche Teil der Verbindungsleitung 16 kann z. B. ein Tauchrohr sein.The space of the cylindrical guide 15 closed off by the auxiliary piston 14, like the connecting line 16, is filled with the gas of the compensating cylinder 8b. Of course, the line can also be filled with hydraulic fluid. Then it is only necessary to ensure that mechanical separation from the compressed gas is provided in the compensating cylinder 8b in any way known per se. The movable part of the connecting line 16 can, for. B. be a dip tube.

Die Funktion des Hilfskolbens 14, der eine sehr geringe eigene Masse aufweist, besteht darin, beim Übergang zur Nachdruckphase auftretende Druckspitzen unmittelbar bei deren Auftreten durch Nachgeben in der zylindrischen Führung 15 gegenüber dem in dem Ausgleichszylinder 8b eingestellten Gasdruck abzufangen. Hierzu ist nur ein äußerst geringer Verschiebeweg des Kolbens 14 erforderlich, der bis zum Einsetzen der Druckspitze sich in seiner zu der Stirnfläche des Preßkolbens minimal entfernten Endstellung befindet.The function of the auxiliary piston 14, which has a very low mass of its own, is to absorb pressure peaks occurring during the transition to the holding pressure phase immediately when they occur by giving in in the cylindrical guide 15 with respect to the gas pressure set in the compensating cylinder 8b. For this purpose, only an extremely small displacement path of the piston 14 is required, which is in its end position which is minimally removed from the end face of the press piston until the pressure peak is inserted.

Während der Hilfskolben 14 nur zum Abfangen der Druckspitzen dienen soll, sorgt der in dem Ausgleichszylinder 8b angeordnete Kolben 11 durch seine Verschiebung dann für eine Aufrechterhaltung des gewünschten Nachdruckes in der Nachdruckphase.While the auxiliary piston 14 is only intended to absorb the pressure peaks, the piston 11 arranged in the compensating cylinder 8b then ensures, through its displacement, that the desired holding pressure is maintained in the holding pressure phase.

Claims (3)

1. Einrichtung zur Druckspitzenverhinderung in dem Preßaggregat einer Druckgießmaschine, insbesondere Kaltkammerdruckgießmaschine mit 3-Phasen-Arbeitssystem, bei der das Einpreßteil aus einem Preßzylinder (1) mit einem Preßkolben (4) besteht und zumindest der für die Formfüllphase (zweite Phase) und Nachdruckphase (dritte Phase) erforderliche Füll-, End- und Nachdruck aus einem mit Flüssigkeit gefüllten unter Gasdruck stehenden Hochdruckspeicher (7a, 7b) aufgebracht wird und bei der eine Druckbegrenzungsvorrichtung zur Vermeidung von Druckstößen am Ende der Formfüllphase sowie zur Einstellung des End- und Nachdruckes in der Nachcruckphase vorgesehen ist, dadurch gekennzeichnet,
daß in dem Preßkolben (4) ein in Achsrichtung des Preßkolbens (4) verschiebbarer Hilfskolben (14) in einer zylindrischen in die dem Hochdruckmedium ausgesetzte Stirnfläche des Kolbens (4) frei mündenden Führung (15) angeordnet ist, die an ihrem gegenüberliegenden Ende mit einem dem gewünschten Nachdruck vorgespannten Gasbehälter (8b) verbunden ist.1. Device for preventing pressure peaks in the press unit of a die casting machine, in particular a cold chamber die casting machine with a 3-phase working system, in which the press-in part consists of a press cylinder (1) with a press piston (4) and at least that for the mold filling phase (second phase) and holding pressure phase ( third phase) the required filling, final and holding pressure is applied from a liquid-filled high-pressure accumulator (7a, 7b) and in which a pressure limiting device to avoid pressure surges at the end of the mold filling phase and to adjust the final and holding pressure in the Post-pressure phase is provided, characterized in that
that in the plunger (4) in the axial direction of the plunger (4) displaceable auxiliary piston (14) is arranged in a cylindrical into the exposed to the high pressure medium end face of the piston (4) freely opening guide (15) which at its opposite end with a the prestressed gas container (8b) is connected. 2. Einrichtung nach Anspruch 1, dadurch gekennzeichnet,
daß die Verbindung der zylindrischen Führung (15)
mit dem Gasbehälter (8b) über eine Verbindungsleitung (16) erfolgt, die ein bewegliches Teil aufweist, das ein in das Preßaggregat eingebautes internes, abgedichtetes Tauchrohr ist.2. Device according to claim 1, characterized in
that the connection of the cylindrical guide (15)
with the gas container (8b) via a connecting line (16) takes place, which has a movable part, which is an internal, sealed immersion tube installed in the press unit. 3. Einrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet,
daß das Medium zur Druckübertragung zwischen dem Hilfskolben (14) und dem Gasbehälter (8b) ein Hydraulikmedium oder ein inertes Gas ist.3. Device according to one of the preceding claims, characterized in
that the medium for pressure transmission between the auxiliary piston (14) and the gas container (8b) is a hydraulic medium or an inert gas.
EP85115502A 1984-12-21 1985-12-06 Apparatus for preventing pressure peaks in a pressure device of a die-casting machine Withdrawn EP0186002A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3446836 1984-12-21
DE19843446836 DE3446836A1 (en) 1984-12-21 1984-12-21 DEVICE FOR PRESSURE TIP PREVENTION IN THE PRESSING UNIT OF A DIE CASTING MACHINE

Publications (1)

Publication Number Publication Date
EP0186002A1 true EP0186002A1 (en) 1986-07-02

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Application Number Title Priority Date Filing Date
EP85115502A Withdrawn EP0186002A1 (en) 1984-12-21 1985-12-06 Apparatus for preventing pressure peaks in a pressure device of a die-casting machine

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EP (1) EP0186002A1 (en)
JP (1) JPS61154754A (en)
DE (1) DE3446836A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262519A2 (en) * 1986-09-27 1988-04-06 Maschinenfabrik Müller-Weingarten AG Method and apparatus for damping the pressure peak occurring at the end of the die filling phase in pressure die casting machines
DE102005032297A1 (en) * 2005-07-11 2007-01-25 Laeis Gmbh Piston-cylinder arrangement
CN111442001A (en) * 2020-03-20 2020-07-24 宁波海天金属成型设备有限公司 Oil circuit structure for double closed-loop control of injection speed and injection force and control mode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106424652B (en) * 2016-11-14 2018-08-24 苏州慧驰轻合金精密成型科技有限公司 A kind of mesohigh Casting Equipment control pressurer system and control method

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Publication number Priority date Publication date Assignee Title
FR1397882A (en) * 1963-06-24 1965-04-30 Gen Motors Corp Die casting process and machine
US3536128A (en) * 1967-02-03 1970-10-27 Corpet Louvet & Cie Injection assembly for a pressure moulding machine
DE3014868A1 (en) * 1979-06-18 1981-01-22 Buehler Ag Geb DIE CASTING MACHINE
EP0068147A1 (en) * 1981-06-30 1983-01-05 Mahle Gmbh Device for pressure admission at the squeeze cylinder in a pressure die casting machine

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Publication number Priority date Publication date Assignee Title
JPS5819383B2 (en) * 1977-02-15 1983-04-18 東芝機械株式会社 injection molding equipment
DE2949583A1 (en) * 1979-12-10 1981-04-30 Eisenwerk Hensel Bayreuth Dipl.-Ing. Burkhardt Gmbh, 8580 Bayreuth Pressure equalising system for hot chamber diecasting machine - uses relief valve inside piston, between pressure vessel and overflow tank

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1397882A (en) * 1963-06-24 1965-04-30 Gen Motors Corp Die casting process and machine
US3536128A (en) * 1967-02-03 1970-10-27 Corpet Louvet & Cie Injection assembly for a pressure moulding machine
DE3014868A1 (en) * 1979-06-18 1981-01-22 Buehler Ag Geb DIE CASTING MACHINE
EP0068147A1 (en) * 1981-06-30 1983-01-05 Mahle Gmbh Device for pressure admission at the squeeze cylinder in a pressure die casting machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0262519A2 (en) * 1986-09-27 1988-04-06 Maschinenfabrik Müller-Weingarten AG Method and apparatus for damping the pressure peak occurring at the end of the die filling phase in pressure die casting machines
EP0262519A3 (en) * 1986-09-27 1989-02-01 Maschinenfabrik Muller-Weingarten Ag Method and apparatus for damping the pressure peak occurring at the end of the die filling phase in pressure die casting machines
DE102005032297A1 (en) * 2005-07-11 2007-01-25 Laeis Gmbh Piston-cylinder arrangement
US7481161B2 (en) 2005-07-11 2009-01-27 Laeis Gmbh Plunger-cylinder assembly
DE102005032297B4 (en) * 2005-07-11 2018-02-01 Laeis Gmbh Hydraulic press with piston-cylinder arrangement
CN111442001A (en) * 2020-03-20 2020-07-24 宁波海天金属成型设备有限公司 Oil circuit structure for double closed-loop control of injection speed and injection force and control mode
CN111442001B (en) * 2020-03-20 2022-06-10 宁波海天金属成型设备有限公司 Oil circuit structure for double closed-loop control of injection speed and injection force and control mode

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JPS61154754A (en) 1986-07-14
DE3446836A1 (en) 1986-07-03

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