EP1177058B1 - Sealing of suction casing on the piston side during a vacuum die-casting method - Google Patents

Sealing of suction casing on the piston side during a vacuum die-casting method Download PDF

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Publication number
EP1177058B1
EP1177058B1 EP00916814A EP00916814A EP1177058B1 EP 1177058 B1 EP1177058 B1 EP 1177058B1 EP 00916814 A EP00916814 A EP 00916814A EP 00916814 A EP00916814 A EP 00916814A EP 1177058 B1 EP1177058 B1 EP 1177058B1
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EP
European Patent Office
Prior art keywords
seal
casting
plunger
piston
diameter
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 - Lifetime
Application number
EP00916814A
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German (de)
French (fr)
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EP1177058A1 (en
Inventor
Friedrich Stummer
Tobias Schwarz
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Mueller Weingarten AG
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Mueller Weingarten AG
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Filing date
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Publication of EP1177058A1 publication Critical patent/EP1177058A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/14Machines with evacuated die cavity

Definitions

  • the invention relates to a piston-side seal in die-casting machines which are subjected to a vacuum process, especially after the Vacural process, work and with an extraction gap or suction box are equipped.
  • the dosage of the melt takes place in the filling chamber via a in the molten bath befindliches Intake manifold.
  • This melt dosage is caused by the Applying a vacuum, which after closing the mold is opened by opening a vacuum valve.
  • this mold vacuum is also for the better and regulated vacuum effect an additional casting chamber vacuum possible, as described by the applicant in DE 30 41 340 C 2 as Vacural Die Casting described.
  • a sealed area is the rear side the piston or the piston rod with the casting unit is coupled.
  • a seal on a casting piston is in the US PS 3,009,218 discloses, proposed is a casting piston with a constant piston diameter over its entire Length. Due to the casting process occur in the casting chamber Damage like flushing or scoring on, this Mechanical damage also leads to damage of the casting piston. In the proposed embodiment, the Piston seal then also come to harm and the Sealing effect is not guaranteed in continuous operation.
  • the invention is based on the object when using the Vacuum die casting a sealing system for a To propose casting piston, which has a long service life guaranteed and significantly reduces the risk of accidents.
  • the object is achieved in that a extended casting piston via at least one paragraph, i. smaller diameter, has at its rear end and attached in the suction box seal retracted piston is in sealing connection with this.
  • the seal installation is intended to be a force or positive connection made and the sealing ring can via a separation point which have its installation or Replacement without major installation measures possible.
  • the selected casting piston design ensures on the one hand that mechanical piston damage not at the smaller one Seal diameter occur because this diameter no Contact with the bore of the casting chamber and is to the other by the simple manufacturing process concentricity of the G mankolben preparer given. Furthermore, after a G mankolbenabriß, which is usually in the range of advanced casting position would take place, the cooling water exit through the now open to the rear annulus.
  • FIG. 1 shows the injection system 1 of a Vacural die casting machine which via anchor 2 with the fixed Clamping plate 3 is connected. Between solid Clamping plate 3 and stator part 4 of the injection system 1 is arranged the holding furnace 5 for the liquid melt. The below the melt surface in the holding furnace. 5 submerged suction pipe is designated 6. The upper end of suction pipe 6 is connected to the casting chamber 7. In the Casting 7 is casting piston 8 with the Casting piston rod 9 is connected. Casting piston rod 9 is with the actual G cordaggragat 10 connected.
  • FIG. 1 An enlarged view of the inventive concept is shown in FIG.
  • Casting 8 of different diameter D1 and D2 features The smaller diameter D2 is through Seal 11 in shown retracted position sealed, with the retracted position the Operating state corresponds in which the melt on the Vacuum build-up is sucked through suction tube 6, while in the Forward movement of the casting piston 8 is no longer a seal is required. It may even occur in the situation which is a flow of air or targeted use a protective gas, the sinking of the residual melt and thus the prevent a "freezing" of the melt in the intake manifold required.
  • Seal 11 is by means of a clamping ring 12 frictionally connected with suction box 13.
  • a T-profile can also choose a positive connection become. Preference is given to a one-sided or two-sided split seal 11 used, causing an exchange of the Sealing ring only by removal of clamping or retaining ring 12th allows.
  • the part of the sealing ring can e.g. in shape an oblique stroke, whereby an optimal Sealing effect is achieved.
  • the invention is not limited to that described and illustrated Embodiment limited. It also includes all professional designs within the framework of the applicable Claim 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Description

Die Erfindung bezieht sich auf eine kolbenseitige Abdichtung bei Druckgußmaschinen die nach einem Vakuum-Verfahren, insbesondere nach dem Vacural-Verfahren, arbeiten und mit einem Absaugspalt oder Absaugkasten ausgerüstet sind.The invention relates to a piston-side seal in die-casting machines which are subjected to a vacuum process, especially after the Vacural process, work and with an extraction gap or suction box are equipped.

Zur Erhöhung der Funktionssicherheit und der Dichtungsstandzeit wird eine Abdichtung auf einem im Durchmesser abgesetzten Gießkolben vorgeschlagen.To increase the reliability and the Seal life becomes a seal on an im Diameter stepped casting piston proposed.

Stand der TechnikState of the art

Die Produktion von Leichtmetallteilen erfolgt in erheblichen Mengen im Druckgießverfahren. Eine dominierende Stellung nehmen dabei Bauteile aus Aluminium und seiner Legierungen ein, jedoch wird auch Magnesium als Konstruktionswerkstoff immer attraktiver.The production of light metal parts takes place in considerable Quantities in die casting. A dominant position take components from aluminum and its alloys However, magnesium is also used as a construction material always attractive.

Traditionell finden die bekannten Druckgießverfahren nach dem Kaltkammer- oder, insbesondere für kleinere Bauteile, nach dem Warmkammerverfahren statt. Für eine Vielfalt von Teilen haben sich diese Verfahren bewährt. Sind jedoch hochwertige Bauteile mit minimalen Oxide- und Verunreinigungseinschlüssen gefordert die höhere dynamische Festigkeitswerte gewährleisten und/oder einer nachfolgenden Wärmebehandlung unterzogen werden, so findet bevorzugt ein Vakuumdruckgießverfahren Anwendung.Traditionally, the known die casting methods find after Cold chamber or, especially for smaller components, after the hot chamber method instead. For a variety of parts These methods have proven themselves. But are high quality Components with minimal oxide and contaminant inclusions demanded the higher dynamic strength values ensure and / or a subsequent heat treatment be subjected, so is preferred Vacuum die casting application.

Bei einem dieser Verfahren erfolgt die Dosierung der Schmelze in die Füllkammer über ein im Schmelzbad befindliches Saugrohr. Veranlaßt wird diese Schmelzdosierung durch das Anlegen eines Vakuums, welches nach dem Schließen der Form durch Öffnen eines Vakuumventils zugeschaltet wird. Zusätzlich zu diesem Formvakuum ist auch zur besseren und geregelteren Vakuumwirkung ein zusätzliches Gießkammervakuum möglich, wie vom Anmelder in der DE 30 41 340 C 2 als Vacural-Druckgießverfahren beschrieben.In one of these methods, the dosage of the melt takes place in the filling chamber via a in the molten bath befindliches Intake manifold. This melt dosage is caused by the Applying a vacuum, which after closing the mold is opened by opening a vacuum valve. In addition to this mold vacuum is also for the better and regulated vacuum effect an additional casting chamber vacuum possible, as described by the applicant in DE 30 41 340 C 2 as Vacural Die Casting described.

Zur Erzielung einer entsprechenden Prozeßsicherheit und um eine optimale Vakuumwirkung zu gewährleisten muß das gesamte Verfahren möglichst in einem geschlossenen Kreislauf ablaufen und somit nach außen entsprechend abgedichtet sein.To achieve appropriate process security and order to ensure an optimal vacuum effect must the entire If possible proceed in a closed cycle and thus be sealed according to the outside.

Ein abzudichtender Bereich ist dabei die rückwärtige Seite des Kolbens- bzw. der Kolbenstange die mit dem Gießaggregat gekuppelt ist. Als Dichtungsträger hat sich der Absaugkasten der zur Abführung der an der Gießkolbenrückseite austretenden dünnen Leichtmetallresten, dem sog. Flitter, bewährt.A sealed area is the rear side the piston or the piston rod with the casting unit is coupled. As a seal carrier, the suction box for discharging the exiting at the back of the casting piston thin light metal residues, the so-called tinsel, proven.

So ist z.B. in der EP 0 462 218 in einer am Ende des Absaugkasten befestigten Flanschbuchse eine Dichtung angebracht, die die Gießkolbenstange im Austrittsbereich aus dem Absaugkasten abdichtet. Ein wesentlicher Nachteil dieser Dichtungsanordnung ist, daß bei einem Abriß des Kolben am Verbindungsgewinde zwischen Kolben und Kolbenstange die Dichtwirkung an der Kolbenstange bestehen bleibt. Üblicherweise befinden sich die zur Kolbenkühlung erforderlichen Kühlwasserbohrungen in der Kolbenstange, so daß nach Kolbenabriß dann das Kühlwasser aus der Gießkolbenstange austritt. Durch die sich dann ergebende Situation kann das Kühlwasser im wesentlichen nur über das Ansaugrohr in das Schmelzebad des Warmhalteofen zurücklaufen. Neben der Störung des Gießprozeßes und der Beeinträchtigung der Schmelze besteht dann bei Vergießung von Magnesium oder Aluminium eine hohe Unfallgefahr. Möglichkeiten der Gefährdung entstehen durch eine explosionsartige Reaktion oder durch die erhebliche Volumenvergrößerung und damit Druckerhöhung des im Saugrohr mit der heißen Schmelze zusammentreffenden Kühlwassers in dem sich ergebenden abgeschlossenen Raum. Ein weiterer Nachteil dieser Dichtungsanordnung ist der erhöhte Dichtungsverschleiß, wenn Kolben und Kolbenstange nicht symmetrisch zueinander sind, d.h. einen Versatz aufweisen.For example, e.g. in EP 0 462 218 in one at the end of Suction box attached flange bushing a seal attached, the casting piston rod in the exit area seals the suction box. A major disadvantage of this Sealing arrangement is that at a demolition of the piston on Connecting thread between piston and piston rod the Sealing effect remains on the piston rod. Usually they are for the piston cooling required cooling water holes in the piston rod, so that after piston separation then the cooling water from the Casting piston rod emerges. By then resulting Situation, the cooling water substantially only over the Inlet pipe run back into the melt bath of the holding furnace. Besides the disturbance of the casting process and the impairment the melt then exists when casting magnesium or Aluminum a high risk of accidents. Possibilities of Danger due to an explosive reaction or by the considerable increase in volume and thus Pressure increase in the intake manifold with the hot melt coincident cooling water in the resulting enclosed space. Another disadvantage of this Seal arrangement is the increased seal wear when Piston and piston rod are not symmetrical to each other, i.e. have an offset.

Eine Abdichtung auf einem Gießkolben ist in der US PS 3,009,218 offenbart, vorgeschlagen wird ein Gießkolben mit einem gleichbleibenden Kolbendurchmesser über seine gesamte Länge. Bedingt durch den Gießprozeß treten in der Gießkammer Beschädigungen wie Ausschwemmungen oder Riefen auf, diese mechanischen Beeinträchtigungen führen auch zur Beschädigung des Gießkolben. Bei der vorgeschlagenen Ausführung kann die Kolbendichtung dann ebenfalls zu Schaden kommen und die Dichtwirkung ist im Dauerbetrieb nicht gewährleistet.A seal on a casting piston is in the US PS 3,009,218 discloses, proposed is a casting piston with a constant piston diameter over its entire Length. Due to the casting process occur in the casting chamber Damage like flushing or scoring on, this Mechanical damage also leads to damage of the casting piston. In the proposed embodiment, the Piston seal then also come to harm and the Sealing effect is not guaranteed in continuous operation.

Aufgabe und Vorteil der ErfindungTask and advantage of the invention

Der Erfindung liegt die Aufgabe zugrunde, bei Anwendung des Vakuumdruckgießverfahren ein Dichtungssystem für einen Gießkolben vorzuschlagen, welches eine hohe Standzeit gewährleistet und eine Unfallgefahr wesentlich herabsetzt.The invention is based on the object when using the Vacuum die casting a sealing system for a To propose casting piston, which has a long service life guaranteed and significantly reduces the risk of accidents.

Diese Aufgabe wird ausgehend von einem Dichtungssystem nach dem Oberbegriff des Anspruch 1, durch die kennzeichnenden Merkmale des Anspruch 1 gelöst. In den Unteransprüchen werden vorteilhafte und zweckmäßige Weiterbildungen des Dichtungsystems vorgeschlagen.This task is based on a sealing system the preamble of claim 1, by the characterizing Characteristics of claim 1 solved. In the dependent claims are advantageous and expedient developments of Sealing system proposed.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß ein verlängerter Gießkolben über mindestens einen Absatz, d.h. kleineren Durchmesser, an seinem rückwärtigen Ende verfügt und die im Absaugkasten angebaute Dichtung bei zurückgefahrenem Kolben mit diesem in Dichtverbindung steht. Der Dichtungseinbau soll dabei über eine kraft- oder formschlüssige Verbindung erfolgen und der Dichtring kann über eine Trennstelle verfügen die seinen Einbau oder Austausch ohne wesentliche Montagemaßnahmen ermöglicht. Die gewählte Gießkolbenausführung gewährleistet zum einen, daß mechanische Kolbenbeschädigung nicht am kleineren Dichtungsdurchmesser auftreten, da dieser Durchmesser keinen Kontakt zu der Bohrung der Gießkammer hat und zum anderen ist durch das einfache Herstellverfahren eine Konzentrizität der Gießkolbendurchmesser gegeben. Weiterhin könnte nach einem Gießkolbenabriß, der im Regelfall im Bereich einer vorgefahrenen Gießstellung erfolgen würde, das Kühlwasser durch den nun nach hinten offenen Ringraum austreten.According to the invention the object is achieved in that a extended casting piston via at least one paragraph, i. smaller diameter, has at its rear end and attached in the suction box seal retracted piston is in sealing connection with this. The seal installation is intended to be a force or positive connection made and the sealing ring can via a separation point which have its installation or Replacement without major installation measures possible. The selected casting piston design ensures on the one hand that mechanical piston damage not at the smaller one Seal diameter occur because this diameter no Contact with the bore of the casting chamber and is to the other by the simple manufacturing process concentricity of the Gießkolbendurchmesser given. Furthermore, after a Gießkolbenabriß, which is usually in the range of advanced casting position would take place, the cooling water exit through the now open to the rear annulus.

Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels:Further details and advantages of the invention will become apparent from the following description of a Embodiment:

Die Figuren zeigen:

Figur 1
Einspritzsystem einer Vacural-Druckgießmaschine
Figur 2
Einzelheit des Gießkolben mit Absaugkasten und Abdichtung
The figures show:
FIG. 1
Injection system of a Vacural die casting machine
FIG. 2
Detail of the casting piston with suction box and seal

Beschreibung des AusführungsbeispielDescription of the embodiment

Figur 1 zeigt das Einspritzsystem 1 einer Vacural-Druckgießmaschine welches über Anker 2 mit der festen Aufspannplatte 3 verbunden ist. Zwischen fester Aufspannplatte 3 und Ständerteil 4 des Einspritzsystem 1 ist der Warmhalteofen 5 für die flüssige Schmelze angeordnet. Das unterhalb der Schmelzbadoberfläche in den Warmhalteofen 5 eintauchende Saugrohr ist mit 6 bezeichnet. Das obere Ende von Saugrohr 6 ist mit Gießkammer 7 verbunden. In der Gießkammer 7 befindet sich Gießkolben 8 der mit Gießkolbenstange 9 verbunden ist. Gießkolbenstange 9 ist mit dem eigentlichen Gießaggragat 10 verbunden.FIG. 1 shows the injection system 1 of a Vacural die casting machine which via anchor 2 with the fixed Clamping plate 3 is connected. Between solid Clamping plate 3 and stator part 4 of the injection system 1 is arranged the holding furnace 5 for the liquid melt. The below the melt surface in the holding furnace. 5 submerged suction pipe is designated 6. The upper end of suction pipe 6 is connected to the casting chamber 7. In the Casting 7 is casting piston 8 with the Casting piston rod 9 is connected. Casting piston rod 9 is with the actual Gießaggragat 10 connected.

Eine vergrößerte Darstellung des erfindungsgemäßen Gedanken ist in Figur 2 gezeigt. In Gießkammer 7 befindet sich Gießkolben 8 der über unterschiedlich große Durchmesser D1 und D2 verfügt. Der kleinere Durchmesser D2 wird durch Dichtung 11 in gezeigter zurückgefahrenen Stellung abgedichtet, wobei die zurückgefahrene Stellung dem Betriebszustand entspricht in dem die Schmelze über den Vakuumaufbau durch Saugrohr 6 angesaugt wird, während in der Vorwärtsbewegung des Gießkolben 8 eine Abdichtung nicht mehr erforderlich ist. Es kann sogar die Situation eintreten in dem ein nachfließen der Luft oder die gezielte Verwendung eines Schutzgases das absinken der Restschmelze und damit das verhindern eines "einfrieren" der Schmelze im Saugrohr erforderlich macht. Dichtung 11 wird mittels eines Klemmring 12 mit Absaugkasten 13 reibschlüssig verbunden. Durch die entsprechende Formgestaltung des Dichtringes 11 z.B. ein T-Profil kann auch eine formschlüssige Verbindung gewählt werden. Bevorzugt wird ein einseitig oder beidseitig geteilter Dichtring 11 verwendet, was einen Austausch des Dichtringes nur durch Entfernung von Klemm- oder Haltering 12 ermöglicht. Die Teilstelle des Dichtringes kann z.B. in Form eines Schrägstoßes ausgeführt werden, wodurch eine optimale Dichtwirkung erzielt wird. Der Gießkolben 8 ist bevorzugt so ausgebildet, das der kleinere Durchmesser D2 (=Dichtdurchmesser) in seinem Endbereich sich kegelig verjüngent ausgebildet ist und die Übergänge mit entsprechend großzügigen Radien gestaltet werden. Durch diese Form ist ein funktionssicheres Ein- und Ausfahren aus der Dichtung 11 gewährleistet, was wiederum zur Schonung der Dichtung beiträgt.An enlarged view of the inventive concept is shown in FIG. In casting chamber 7 is located Casting 8 of different diameter D1 and D2 features. The smaller diameter D2 is through Seal 11 in shown retracted position sealed, with the retracted position the Operating state corresponds in which the melt on the Vacuum build-up is sucked through suction tube 6, while in the Forward movement of the casting piston 8 is no longer a seal is required. It may even occur in the situation which is a flow of air or targeted use a protective gas, the sinking of the residual melt and thus the prevent a "freezing" of the melt in the intake manifold required. Seal 11 is by means of a clamping ring 12 frictionally connected with suction box 13. By the corresponding shape of the sealing ring 11, e.g. a T-profile can also choose a positive connection become. Preference is given to a one-sided or two-sided split seal 11 used, causing an exchange of the Sealing ring only by removal of clamping or retaining ring 12th allows. The part of the sealing ring can e.g. in shape an oblique stroke, whereby an optimal Sealing effect is achieved. The casting piston 8 is preferably so formed, the smaller diameter D2 (= Sealing diameter) in its end region is tapered rejuvenated is formed and the transitions with accordingly generous radii are designed. This shape is a reliable insertion and removal from the seal 11 ensures, in turn, to protect the seal contributes.

Die Erfindung ist nicht auf das beschriebene und dargestellte Ausführungsbeispiel beschränkt. Sie umfaßt auch alle fachmännischen Ausgestaltungen im Rahmen des geltenden Anspruches 1. The invention is not limited to that described and illustrated Embodiment limited. It also includes all professional designs within the framework of the applicable Claim 1.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Einspritzsysteminjection
22
Ankeranchor
33
Feste AufspannplatteFixed platen
44
Ständerteilstand Body
55
WarmhalteofenHolding furnace
66
Saugrohrsuction tube
77
Gießkammercasting chamber
88th
Gießkolbencasting plunger
99
GießkolbenstangeGießkolbenstange
1010
Gießaggregatcasting unit
1111
Dichtungpoetry
1212
Klemmring, HalteringClamping ring, retaining ring
1313
Absaugkastensuction

Claims (4)

  1. Seal for the plunger (8) of a die casting machine with attached suction box (13), the metal being conveyed from a melting or holding furnace (5) into the casting chamber (7) by means of evacuation via a suction pipe (6), the diameter of the plunger (8) being greater than the diameter of the plunger rod (9), characterised in that the plunger (8) has at least two different diameters D1 and D2, the smaller diameter D2 being arranged on the trailing end of the plunger (8) in the direction of the plunger rod (9), and a seal (11) corresponding to the diameter D2 being arranged in the suction box (13) provided in the direction of the casting unit (10) on the front end of the casting chamber (7).
  2. Seal according to claim 1, characterised in that the seal (11) is non-positively or positively connected to the suction box (13) by means of a clamping or holding ring (12).
  3. Seal according to claim 1 or 2, characterised in that the seal (11) has at least one divided point.
  4. Seal according to claim 1, characterised in that the plunger (8) is constructed to adjoin the plunger diameter D2 with a conical end and transition radii.
EP00916814A 1999-05-08 2000-03-10 Sealing of suction casing on the piston side during a vacuum die-casting method Expired - Lifetime EP1177058B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19921496 1999-05-08
DE19921496A DE19921496A1 (en) 1999-05-08 1999-05-08 Piston-side suction seal when using the vacuum pressure casting process
PCT/DE2000/000764 WO2000067935A1 (en) 1999-05-08 2000-03-10 Sealing of suction casing on the piston side during a vacuum die-casting method

Publications (2)

Publication Number Publication Date
EP1177058A1 EP1177058A1 (en) 2002-02-06
EP1177058B1 true EP1177058B1 (en) 2003-02-19

Family

ID=7907580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00916814A Expired - Lifetime EP1177058B1 (en) 1999-05-08 2000-03-10 Sealing of suction casing on the piston side during a vacuum die-casting method

Country Status (5)

Country Link
US (1) US6749005B1 (en)
EP (1) EP1177058B1 (en)
JP (1) JP2002543982A (en)
DE (2) DE19921496A1 (en)
WO (1) WO2000067935A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3921513B2 (en) 2002-04-17 2007-05-30 株式会社木村工業 Molding apparatus and mold unit used therefor
DE202006011541U1 (en) * 2006-07-27 2007-12-06 Bdw Technologies Gmbh & Co. Kg casting plunger
KR20090126224A (en) * 2009-11-02 2009-12-08 (주)엔티티 Die casting apparatus
DE102019107325A1 (en) * 2019-03-21 2020-09-24 Engel Austria Gmbh Melting unit for a molding machine and molding machine with such

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009218A (en) * 1958-10-22 1961-11-21 David M Morgenstern Apparatus for vacuum feeding a die casting machine
US3254377A (en) * 1963-04-22 1966-06-07 Glenn R Morton Fluid cooled, lubricated and sealed piston means for casting devices
DE3041340A1 (en) * 1980-11-03 1982-05-13 Maschinenfabrik Weingarten Ag, 7987 Weingarten DIE CASTING METHOD FOR THE PRODUCTION OF LOW-GAS, LOW-PORENOUS AND LOW-OXYDOW CASTING PIECES, AND DIE CASTING MACHINE FOR IMPLEMENTING THE METHOD
DE3401715C2 (en) * 1984-01-19 1986-02-27 Maschinenfabrik Müller-Weingarten AG, 7987 Weingarten Die-casting process for the production of low-gas, low-pore and low-oxide castings
US4886107A (en) * 1986-02-28 1989-12-12 Zecman Kenneth P Piston for cold chamber
US5076344A (en) * 1989-03-07 1991-12-31 Aluminum Company Of America Die-casting process and equipment
DE4101592A1 (en) * 1991-01-21 1992-07-23 Mueller Weingarten Maschf DIE CASTING MACHINE
DE19754532C1 (en) * 1997-12-09 1999-04-01 Kunz Konstruktion Und Druckgie Coupling unit for the piston rod of a die casting piston
US6237672B1 (en) 1998-12-30 2001-05-29 Dbm Industries, Ltd. Self lubricating and cleaning injection piston for cold chamber injection unit

Also Published As

Publication number Publication date
DE19921496A1 (en) 2000-11-09
DE50001278D1 (en) 2003-03-27
US6749005B1 (en) 2004-06-15
WO2000067935A1 (en) 2000-11-16
EP1177058A1 (en) 2002-02-06
JP2002543982A (en) 2002-12-24

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