EP1284168B1 - Method for operating a hot chamber die casting machine and die casting machine - Google Patents

Method for operating a hot chamber die casting machine and die casting machine Download PDF

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Publication number
EP1284168B1
EP1284168B1 EP01118778A EP01118778A EP1284168B1 EP 1284168 B1 EP1284168 B1 EP 1284168B1 EP 01118778 A EP01118778 A EP 01118778A EP 01118778 A EP01118778 A EP 01118778A EP 1284168 B1 EP1284168 B1 EP 1284168B1
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EP
European Patent Office
Prior art keywords
casting
metal
die
hot
chamber
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EP01118778A
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German (de)
French (fr)
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EP1284168A1 (en
Inventor
Roland Fink
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Oskar Frech GmbH and Co KG
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Oskar Frech GmbH and Co KG
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Application filed by Oskar Frech GmbH and Co KG filed Critical Oskar Frech GmbH and Co KG
Priority to AT01118778T priority Critical patent/ATE314169T1/en
Priority to DE50108552T priority patent/DE50108552D1/en
Priority to EP01118778A priority patent/EP1284168B1/en
Priority to ES01118778T priority patent/ES2253309T3/en
Priority to CZ20022631A priority patent/CZ298982B6/en
Priority to JP2002231057A priority patent/JP4307806B2/en
Priority to PL355407A priority patent/PL202883B1/en
Priority to US10/214,182 priority patent/US6761209B2/en
Publication of EP1284168A1 publication Critical patent/EP1284168A1/en
Priority to HK03104236A priority patent/HK1051983A1/en
Publication of EP1284168B1 publication Critical patent/EP1284168B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • 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
    • B22D17/04—Plunger machines
    • 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 method for operating a hot-chamber die casting machine, in the liquid metal shot by a back and forth movable plunger from a dipping into a metal bath Casting through the riser to a mouthpiece body and a nozzle tip conveyed into a mold and placed there under pressure becomes.
  • the invention also relates to a hot-chamber die casting machine for Implementation of such a procedure.
  • the object of the present invention is to remedy this situation and to provide a method of operating a hot chamber die casting machine and a correspondingly designed die casting machine to propose, with which relatively safe the air out of the mold and can be removed from the casting system.
  • a hot chamber die casting machine is suitable for carrying out the new method.
  • the one with the riser to the nozzle tip rising channel in the mouthpiece body and with one in the area of Nozzle tip arranged metal sensor is provided, however, the Metal sensor deviating from the proposal according to WO 95/33588 to the Bottom of the mouthpiece body is attached.
  • the metal sensor of the in the Vorphilllphase the casting system slowly filling liquid metal flooded and it can be a sensitive regulation take place.
  • have mouthpiece body common hot-chamber die casting machines have a slope of about 5 °, which can be exploited to the metal in this inclined mouthpiece channel slowly by the forward movement of the casting piston to rise to the metal sensor.
  • Fig. 1 shows first that the total number 1 provided casting system from a furnace 2, not shown in detail a tempered extraction chamber 3 is in the up to the level 4 liquid metal 5 is located.
  • a tempered extraction chamber 3 is in the up to the level 4 liquid metal 5 is located.
  • Metal bath immersed a casting container 6, which has a cylindrical casting chamber 7 and a movable up and down casting piston 8 and a with the casting chamber 7 has associated riser channel 9.
  • the Rising channel 9 opens into a mouthpiece body 10, which in the end the riser 9 provided connection piece 11 of the casting container. 6 used and as well as this is heated, but not shown in detail is.
  • the casting chamber 7 is also provided with a connection opening 12 for Metal bath 5 provided, which in the position shown retracted the casting piston 8 is released.
  • the casting piston 8 in turn is about a piston rod 13 controlled driven, the intended Casting piston drive is not shown.
  • the mouthpiece body 10 is provided with a nozzle tip 14 inserted in it provided, which is apparent from Fig. 2.
  • Fig. 2 is also around the Mouthpiece body 10 arranged around heater 15 indicated.
  • a metal sensor 16 which from the bottom in the Mouthpiece body 10 is inserted and via a connecting cable 17 with a control device 18 is in communication, which in turn is not closer shown manner is connected to the drive for the casting piston 8.
  • Fig. 1 To Fig. 1 is still to be noted that the mouthpiece with the nozzle tip 14 is attached to the feed system 19 for the mold 20, which consists of a on the fixed mold clamping plate 21 of the die casting machine not shown further clamped solid mold half 22 and from the not shown on the attached to the die-casting movable platen movable mold half 23 is constructed.
  • This form 20 is known in the art Way provided with ventilation channels and it is in Fig. 1 in the closed Condition drawn.
  • the closed mold according to FIG. 1 is now opened according to the new method for removing the workpiece which is still in the mold.
  • This mold opening occurs according to FIG. 3 at time zero on the time axis t extending to the right.
  • the casting piston 8 is now moved downwards by its drive from the position shown in FIG. He closes the connection opening 12 to the metal bath 5 and pushes the present in the casting chamber 7 and in the adjacent riser channel 9 to the level 4 liquid melt material through the riser channel upwards into the slightly rising to the mold 20 channel 24 of the mouthpiece 10.
  • the liquid Metal melt 5 reaches, as indicated in FIG.
  • the metal sensor 16 which is inserted from below into the channel 24 of the mouthpiece 10 and flooded at a horizontally extending level 25, so that a signal can be emitted when the liquid melt 5 at the metal sensor 16 or - after a further short period of time to be determined empirically - at the nozzle tip 14 to the horizontally extending maximum level 25a is present.
  • This time, or the time at which the molten metal 5 reaches the metal sensor 16, is now utilized together with "mold closed" as a start signal for the rapid mold filling. In the embodiment of FIG. 3, this is the case at time t after two seconds.
  • the mold itself is closed at time t F , so that afterwards - at the time of the lapse of three seconds - the mold filling process can be used at high speed in the manner already known.

Abstract

The liquid metal in the mouthpiece (10) is pressed into mold, after closing the mold. An Independent claim is also included for hot-chamber pressure die-casting machine.

Description

Die Erfindung betrifft ein Verfahren zum Betrieb einer Warmkammer-Druckgießmaschine, bei dem flüssiges Metall schußweise von einem hin-und her bewegbaren Gießkolben aus einem in ein Metallbad tauchenden Gießbehälter durch dessen Steigkanal zu einem Mundstückskörper und einer Düsenspitze bis in eine Form gefördert und dort unter Druck gesetzt wird.The invention relates to a method for operating a hot-chamber die casting machine, in the liquid metal shot by a back and forth movable plunger from a dipping into a metal bath Casting through the riser to a mouthpiece body and a nozzle tip conveyed into a mold and placed there under pressure becomes.

Die Erfindung betrifft auch eine Warmkammer-Druckgießmaschine zur Durchführung eines solchen Verfahrens.The invention also relates to a hot-chamber die casting machine for Implementation of such a procedure.

Metalldruckgussteile werden in immer größeren Umfang auf allen Gebieten der Technik verwendet, wobei es jeweils auf möglichst hohe Produktqualität ankommt. Bekannt ist es hierzu (DE-PS 29 22 914), wegabhängige Signale zur Steuerung des Einpressvorganges zu verwerten oder Signale, die vom Einpressdruck abhängig sind und aus denen auf die jeweilige Stellung des Gießkolbens und damit auf den Füllungsgrad der Form geschlossen werden kann. Aus der WO 95/33588 ist es darüber hinaus auch bekannt, im Endbereich des Mundstückes, also kurz vor der Düsenspitze, einen von oben in das Mundstück hereinragenden Metallsensor vorzusehen, um exakte tatsächliche Werte über die Lage der Metallfront beim Schuß zu erhalten und daraus dann entsprechende Regelsignale für die Formfüllung und den Einpressdruckverlauf abzuleiten. Diese Maßnahme dient zusammen mit der Verwendung hochdynamischer Stetigventile mit sehr geringen Schaltzeiten dazu bessere Produkte bei dünnwandigem Guß zu erreichen.Metal die castings are becoming more widespread in all fields The technique used, while maintaining the highest possible product quality arrives. It is known this purpose (DE-PS 29 22 914), path-dependent To use signals to control the press-fit process or signals, which are dependent on the injection pressure and from which to the respective position the casting piston and thus closed on the degree of filling of the mold can be. Moreover, it is also known from WO 95/33588 in the end of the mouthpiece, just before the nozzle tip, a provide a metal sensor projecting from above into the mouthpiece, to get accurate actual values about the position of the metal front at the shot receive and then appropriate control signals for the mold filling and derive the Einpressdruckverlauf. This measure serves together with the use of highly dynamic proportional valves with very low Switching times to achieve better products with thin-walled casting.

In allen Fällen aber muß dafür gesorgt werden, dass die in der Form vor dem Einschießen des Metalls vorhandene Luft und die Luft, die sich im Steigkanal und im Mundstückskörper befindet, möglichst vollständig entweichen kann, um Lunkerbildung innerhalb des Druckgussstückes möglichst zu vermeiden. Bekanntlich arbeiten alle Warmkammer-Druckgießmaschinen so, dass nach jedem Schuß der Gießkolben wieder in seine ursprüngliche Stellung zurückgefahren wird, in der eine Verbindungsöffnung zwischen dem im Ofen temperierten Metallbad und dem Gießzylinder freigegeben wird, um den beim Gießvorgang zunächst entleerten Gießzylinder wieder zu füllen. Bei dieser Rückbewegung des Gießkolbens entsteht ein gewisser Unterdruck im Steigkanal und im Mundstückskörper. Da der Mundstückskörper im übrigen auch zur Düsenspitze und zur Form hin leicht ansteigt, fließt nach dem Druckgießvorgang dort noch vorhandenes Metall wieder in den Gießbehälter zurück bis zu dem Niveau, welches vom Metallbadpegel bestimmt wird. Steigkanal und Mundstückskörper sind daher vor jedem Schuß mit Luft gefüllt und es muß dafür gesorgt werden, dass auch diese Luft, die von der Metallfront beim Formfüllvorgang vor sich hergetrieben wird, durch die Form entweichen kann. Dies führt dazu, dass der Formfüllvorgang nicht mit einer, für die Metallfüllung der Form an sich möglichen hohen Geschwindigkeit erfolgen kann. Dazu kommt, dass der Fördervorgang der Metallschmelze und damit die Vorwärtsbewegung des Gießkolbens erst einsetzen kann, wenn die nach dem vorhergehenden Schuß zunächst zur Entnahme des Werkstückes geöffnete Form wieder geschlossen ist. Die Zykluszeit zwischen jedem Schuß wird dadurch, insbesondere durch den in der ersten Füllphase mit sehr geringer Geschwindigkeit bewegten Gießkolben verlängert. Dazu kommt, dass es dennoch nicht möglich ist, die gesamte Luft durch die der Form zugeordneten Lüftungskanäle entweichen zu lassen, so dass im Gussteil Luftporen entstehen können.In all cases, however, care must be taken that in the form above air present in the metal and the air in the air Rising channel and located in the mouthpiece body, as completely escape can be to voids formation within the die cast as possible to avoid. As is known, all hot chamber die casting machines work so that after each shot of the casting piston again is returned to its original position, in which a connection opening between the tempered in the oven metal bath and the Casting cylinder is released to the first emptied during the casting process To fill the casting cylinder again. In this return movement of the casting piston creates a certain negative pressure in the riser and mouthpiece body. As the mouthpiece body incidentally also to the nozzle tip and slightly increases in shape, flows there after Diegießvorgang metal still present back into the casting container back to the Level determined by the metal bath level. Riser channel and Mouthpiece bodies are therefore filled with air before each shot and it must Care should be taken to ensure that this air from the metal front Mold filling is driven in front of him, escape through the mold can. This results in the mold filling process not having one, for the metal filling the form itself possible high speed can. In addition, the conveying process of the molten metal and thus the forward movement of the casting piston can only begin when the after the previous shot, first to remove the workpiece opened form is closed again. The cycle time between each Shot is characterized, in particular by the in the first filling phase extended with very low speed moving plunger. To comes that it is still not possible, the entire air through the To let escape form associated ventilation ducts, so that in Casting air pores can arise.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, hier Abhilfe zu schaffen und ein Verfahren zum Betrieb einer Warmkammer-Druckgießmaschine und eine entsprechend ausgestaltete Druckgießmaschine vorzuschlagen, mit denen relativ sicher die Luft aus der Form und dem Gießsystem abgeführt werden kann.The object of the present invention is to remedy this situation and to provide a method of operating a hot chamber die casting machine and a correspondingly designed die casting machine to propose, with which relatively safe the air out of the mold and can be removed from the casting system.

Zur Lösung dieser Aufgabe wird bei dem erfindungsgemäßen Verfahren der eingangs genannten Art vorgesehen, dass nach jedem Schuß bei offener Form der Gießkolben aus seiner zurückgezogenen Stellung, in der er einen Zulauf aus dem Metallbad in den Gießzylinder des Gießbehälters freigibt, in eine vorgeschobene Stellung bewegt wird, in welcher der Steigkanal und Mundstückskörper mit flüssigem Metall gefüllt sind, dass dann die Form geschlossen und erst danach Metall in die Form gedrückt wird.To solve this problem is in the inventive method of the aforementioned type provided that after each shot at open Shape of the plunger from its retracted position, in which he an inlet from the metal bath in the casting cylinder of the casting container is released, is moved to an advanced position, in which the riser and mouthpiece bodies are filled with liquid metal, that then the mold is closed and only then metal is pressed into the mold.

Durch diese Maßnahme kann der Zeitraum, während dem die Form ohnehin zur Entnahme des Werkstückes geöffnet ist, für einen Teil des Fördervorganges der Metallschmelze für den neuen Schuß ausgenützt werden. Gleichzeitig wird dabei dafür gesorgt, dass die im Steigkanal und im Mundstückskörper befindliche Luft aus dem Gießsystem herausgedrückt wird, wobei sie wegen der noch offenen Form keine Schwierigkeiten zum Entweichen hat. Nach dem dann erfolgten Schließen der Form kann daher der eigentliche Druckgießvorgang eingeleitet werden, bei dem lediglich die in der Form noch vorhandene Luft durch die entsprechenden Entlüftungskanäle aus der Form herausgedrückt werden muß, ehe der Druck auf die Metallschmelze erhöht und der Einpressvorgang vollständig durchgeführt wird. Die Luftmenge jedenfalls, die beim Stand der Technik aus Steigkanal und Mundstückskörper, d.h. aus dem Gießsystem selbst bei jedem Schuß herausgedrückt werden muß, kann in einfacher Weise entweichen, und zwar in einer Zeitspanne, die ohnehin für die Entnahme des Gußteiles zwischen jedem Schuß vorgesehen sein muß.By this measure, the period during which the mold can anyway is open for removal of the workpiece, for a part of the conveying process the molten metal be used for the new shot. At the same time it is ensured that in the riser and in the mouthpiece body air is expelled from the casting system, they have no difficulty escaping due to the still open shape Has. After then closing the mold can therefore the actual Druckgießvorgang be initiated, in which only the in the form still existing air through the corresponding ventilation channels must be pushed out of the mold before the pressure on the molten metal increased and the press-fitting completed becomes. The amount of air in any case, in the prior art from riser and mouthpiece bodies, i. from the casting system itself at each shot must be able to escape, and easily Although in a period of time, anyway for the removal of the casting between every shot must be provided.

In Weiterbildung der Erfindung kann die Ankunft des flüssigen Metalls an der Mundstücksspitze erfasst, der Formschließvorgang eingeleitet und der Gießkolben festgehalten werden, bis die Form geschlossen ist. Durch diese Ausgestaltung kann im Vergleich zum Stand der Technik wegen der Vorfüllung des Gießsystems der eigentliche Formfüll- und Einpressvorgang wesentlich schneller und auch exakter durchgeführt werden, so dass es möglich ist, Produkte hoher Qualität ohne Lufteinschlüsse mit großer Effizienz herzustellen.In a further development of the invention, the arrival of the liquid metal the mouthpiece tip detected, the mold closing process initiated and the Gießkolben be held until the mold is closed. Through this Design can be compared to the prior art because of Pre-filling of the casting system, the actual mold filling and pressing process be done much faster and more accurate, so it possible, high quality products without air pockets with great efficiency manufacture.

Zur Durchführung des neuen Verfahrens eignet sich eine Warmkammer-Druckgießmaschine, die mit einem vom Steigkanal zur Düsenspitze hin ansteigenden Kanal im Mundstückskörper und mit einem im Bereich der Düsenspitze angeordneten Metallsensor versehen ist, wobei allerdings der Metallsensor abweichend vom Vorschlag nach der WO 95/33588 an der Unterseite des Mundstückskörpers angebracht ist. Durch diese Ausgestaltung nämlich wird der Metallsensor von dem in der Vorfüllphase das Gießsystem langsam auffüllenden flüssigen Metall überflutet und es kann eine feinfühlige Regelung stattfinden. Bekanntlich haben Mundstückskörper gängiger Warmkammer-Druckgießmaschinen eine Neigung von etwa 5°, die dazu ausgenützt werden kann, das Metall in diesem geneigten Mundstückskörperkanal langsam durch die Vorwärtsbewegung des Gießkolbens bis zum Metallsensor ansteigen zu lassen.A hot chamber die casting machine is suitable for carrying out the new method. the one with the riser to the nozzle tip rising channel in the mouthpiece body and with one in the area of Nozzle tip arranged metal sensor is provided, however, the Metal sensor deviating from the proposal according to WO 95/33588 to the Bottom of the mouthpiece body is attached. By this configuration namely, the metal sensor of the in the Vorfüllphase the casting system slowly filling liquid metal flooded and it can be a sensitive regulation take place. As you know, have mouthpiece body common hot-chamber die casting machines have a slope of about 5 °, which can be exploited to the metal in this inclined mouthpiece channel slowly by the forward movement of the casting piston to rise to the metal sensor.

Es kann nun eine entsprechende Steuerungseinrichtung vorgesehen werden, die jeweils vom Zeitpunkt des vom Metallsensor abgegebenen Signals, dass das Gießsystem vorgefüllt ist, die Steuerung des Einpressvorganges der Metallschmelze in die Form übernimmt.It can now be provided a corresponding control device, in each case from the time of the signal emitted by the metal sensor, that the casting system is prefilled, the control of the press-fitting process the molten metal takes over into the mold.

Wird dafür gesorgt - was an sich bekannt ist - dass das Badniveau der Metallschmelze im Ofen z.B. über einen Mehrkammerofen stets gleich hoch gehalten ist, dann wird es auch möglich, eine Gießsystemvorfüllkurve vorzugeben, die maschinenspezifisch und unabhängig von der Form ist. Danach arbeitet das Gießkolbenvorschub- und Druckbeaufschlagungssystem formabhängig und kann in bekannter Weise betrieben werden.Is provided - which is known in itself - that the bath level of the Molten metal in the furnace e.g. always the same over a multi-chamber oven high, then it will also be possible to have a casting system prefill curve which is machine-specific and independent of the form. Thereafter, the Gießschubschub- and pressurization system works shape-dependent and can be operated in a known manner.

Die Erfindung ist anhand eines Ausführungsbeispieles in der Zeichnung dargestellt und wird im folgenden erläutert. Es zeigen:

Fig. 1
eine schematische Schnittdarstellung durch das Gießsystem und die Form einer Warmkammer-Druckgießmaschine,
Fig. 2
die vergrößerte Darstellung des mit einer Düsenspitze ausgerüsteten Endes des Mundstückbereiches des Gießsystems und
Fig. 3
den zeitlichen Verlauf der Bewegungsgeschwindigkeit des Gießkolbens und der von ihm geförderten Metallschmelze im Gießsystem nach Fig. 1.
The invention is illustrated by means of an embodiment in the drawing and will be explained in the following. Show it:
Fig. 1
a schematic sectional view through the casting system and the shape of a hot chamber die casting machine,
Fig. 2
the enlarged view of the equipped with a nozzle tip end of the mouthpiece region of the casting system and
Fig. 3
the time course of the movement speed of the casting piston and the molten metal promoted by it in the casting system according to FIG. 1.

Die Fig. 1 läßt zunächst erkennen, dass das mit der Bezugszahl 1 insgesamt versehene Gießsystem aus einem nicht näher gezeigten Ofen 2 mit einer temperierten Entnahmekammer 3 besteht, in der sich bis zum Niveau 4 flüssiges Metall 5 befindet. In dieses vom flüssigen Metall 5 gebildete Metallbad taucht ein Gießbehälter 6 ein, der eine zylindrische Gießkammer 7 und einen darin auf- und abbeweglichen Gießkolben 8 sowie einen mit der Gießkammer 7 in Verbindung stehenden Steigkanal 9 aufweist. Der Steigkanal 9 mündet in einen Mundstückskörper 10 ein, der in das am Ende des Steigkanals 9 vorgesehene Anschlussstück 11 des Gießbehälters 6 eingesetzt und ebenso wie dieses beheizt ist, was aber nicht näher gezeigt ist.Fig. 1 shows first that the total number 1 provided casting system from a furnace 2, not shown in detail a tempered extraction chamber 3 is in the up to the level 4 liquid metal 5 is located. In this formed by the liquid metal 5 Metal bath immersed a casting container 6, which has a cylindrical casting chamber 7 and a movable up and down casting piston 8 and a with the casting chamber 7 has associated riser channel 9. Of the Rising channel 9 opens into a mouthpiece body 10, which in the end the riser 9 provided connection piece 11 of the casting container. 6 used and as well as this is heated, but not shown in detail is.

Die Gießkammer 7 ist außerdem mit einer Verbindungsöffnung 12 zum Metallbad 5 versehen, welche in der dargestellt zurückgezogenen Lage des Gießkolbens 8 freigegeben ist. Der Gießkolben 8 wiederum wird über eine Kolbenstange 13 gesteuert angetrieben, wobei der dazu vorgesehene Gießkolbenantrieb nicht gezeigt ist.The casting chamber 7 is also provided with a connection opening 12 for Metal bath 5 provided, which in the position shown retracted the casting piston 8 is released. The casting piston 8 in turn is about a piston rod 13 controlled driven, the intended Casting piston drive is not shown.

Der Mundstückskörper 10 ist mit einer in ihn eingesetzten Düsenspitze 14 versehen, die aus Fig. 2 erkennbar ist. In Fig. 2 ist auch die um den Mundstückskörper 10 herum angeordnete Heizung 15 angedeutet. Zu erkennen ist auch ein Metallsensor 16, der von der Unterseite her in den Mundstückskörper 10 eingesetzt ist und über ein Anschlusskabel 17 mit einer Steuereinrichtung 18 in Verbindung steht, die wiederum in nicht näher gezeigter Weise mit dem Antrieb für den Gießkolben 8 verbunden ist. The mouthpiece body 10 is provided with a nozzle tip 14 inserted in it provided, which is apparent from Fig. 2. In Fig. 2 is also around the Mouthpiece body 10 arranged around heater 15 indicated. To recognize is also a metal sensor 16, which from the bottom in the Mouthpiece body 10 is inserted and via a connecting cable 17 with a control device 18 is in communication, which in turn is not closer shown manner is connected to the drive for the casting piston 8.

Zu Fig. 1 ist noch zu bemerken, dass das Mundstück mit der Düsenspitze 14 am Zulaufsystem 19 für die Form 20 angesetzt ist, die aus einer an der festen Formenaufspannplatte 21 der nicht weiter gezeigten Druckgießmaschine aufgespannten festen Formhälfte 22 und aus der an der nicht gezeigten beweglichen Formenaufspannplatte der Druckgießmaschine befestigten beweglichen Formenhälfte 23 aufgebaut ist. Diese Form 20 ist in bekannter Weise mit Entlüftungskanälen versehen und sie ist in Fig. 1 im geschlossenen Zustand gezeichnet.To Fig. 1 is still to be noted that the mouthpiece with the nozzle tip 14 is attached to the feed system 19 for the mold 20, which consists of a on the fixed mold clamping plate 21 of the die casting machine not shown further clamped solid mold half 22 and from the not shown on the attached to the die-casting movable platen movable mold half 23 is constructed. This form 20 is known in the art Way provided with ventilation channels and it is in Fig. 1 in the closed Condition drawn.

Die nach Fig. 1 geschlossene Form wird nun nach dem neuen Verfahren zur Entnahme des noch in der Form befindlichen Werkstückes geöffnet. Dieses Formöffnen geschieht nach Fig. 3 zum Zeitpunkt Null auf der nach rechts verlaufenden Zeitachse t. Nach dem neuen Verfahren wird nun bei geöffneter Form der Gießkolben 8 durch seinen Antrieb aus der in der Fig. 1 gezeigten Lage nach unten bewegt. Er verschließt dabei die Verbindungsöffnung 12 zum Metallbad 5 und drückt das in der Gießkammer 7 und in dem angrenzenden Steigkanal 9 bis zum Niveau 4 vorhandene flüssige Schmelzmaterial durch den Steigkanal nach oben in den leicht zur Form 20 hin ansteigenden Kanal 24 des Mundstückes 10. Die flüssige Metallschmelze 5 erreicht dabei, wie Fig. 2 andeutet, den Metallsensor 16, der von unten her in den Kanal 24 des Mundstückes 10 eingesetzt ist und überflutet diesen bei einem horizontal verlaufenden Niveau 25, so dass ein Signal abgegeben werden kann, wenn die flüssige Schmelze 5 am Metallsensor 16 bzw. - nach einer empirisch zu ermittelnden weiteren kurzen Zeitspanne - an der Düsenspitze 14 bis zu dem horizontal verlaufenden maximalen Niveau 25a ansteht. Dieser Zeitpunkt, bzw. der Zeitpunkt, zu dem die Metallschmelze 5 den Metallsensor 16 erreicht, wird nun zusammen mit "Form geschlossen" als Startsignal für die schnelle Formfüllung ausgenützt. Im Ausführungsbeispiel der Fig. 3 ist dies der Fall zum Zeitpunkt t nach zwei Sekunden. Die Form selber ist zum Zeitpunkt tF geschlossen, so dass danach - zum Zeitpunkt des Ablaufs von drei Sekunden - der Formfüllvorgang mit hoher Geschwindigkeit in der auch bisher schon bekannten Weise einsetzen kann.The closed mold according to FIG. 1 is now opened according to the new method for removing the workpiece which is still in the mold. This mold opening occurs according to FIG. 3 at time zero on the time axis t extending to the right. According to the new method, when the mold is open, the casting piston 8 is now moved downwards by its drive from the position shown in FIG. He closes the connection opening 12 to the metal bath 5 and pushes the present in the casting chamber 7 and in the adjacent riser channel 9 to the level 4 liquid melt material through the riser channel upwards into the slightly rising to the mold 20 channel 24 of the mouthpiece 10. The liquid Metal melt 5 reaches, as indicated in FIG. 2, the metal sensor 16, which is inserted from below into the channel 24 of the mouthpiece 10 and flooded at a horizontally extending level 25, so that a signal can be emitted when the liquid melt 5 at the metal sensor 16 or - after a further short period of time to be determined empirically - at the nozzle tip 14 to the horizontally extending maximum level 25a is present. This time, or the time at which the molten metal 5 reaches the metal sensor 16, is now utilized together with "mold closed" as a start signal for the rapid mold filling. In the embodiment of FIG. 3, this is the case at time t after two seconds. The mold itself is closed at time t F , so that afterwards - at the time of the lapse of three seconds - the mold filling process can be used at high speed in the manner already known.

Es wird ohne weiteres erkennbar, dass die von der Schmelze 5 vor dem Gießkolben 8 zu Beginn des in Fig. 3 geschilderten Vorganges vor der Metallfront hergeschobene Luft, die sich noch in dem oberhalb des Niveaus 4 liegenden Teil des Steigkanals 9 und im Kanal 24 des Mundstückkörpers befindet, ohne Probleme aus der noch offenen Form entweichen kann. Die Metallschmelze wird dabei sehr langsam und mit geringer Geschwindigkeit (beim Ausführungsbeispiel etwa 0,1 Meter pro Sekunde) in das Gießsystem eingefüllt, welches auf diese Weise beim Ausführungsbeispiel nach zwei Sekunden vorgefüllt ist. Aus diesem vorgefüllten Gießsystem, welches in Fig. 2 durch das Niveau 25 angedeutet ist, lässt sich nach dem Schließen der Form zum Zeitpunkt tF die Form selbst sehr schnell und fektiv ausschließlich in Abhängigkeit von dem durch die Form gegebenen Bedingungen füllen. Die in der Form vorhandene Luft und der geringe Luftanteil in der Düsenspitze 14 (Fig. 2) behindern das Entweichen dieser nur noch geringen Luftmenge nicht. Auf diese Weise wird es daher möglich, dass das erzeugte Druckgussteil nahezu ohne Lufteinschlüsse herstellbar ist. Es wird auch möglich, eine kürzere Zykluszeit einzuhalten, weil der Vorfüllvorgang für das Gießsystem, der in der Fig. 3 in der Zeit von Null bis zwei Sekunden erfolgt, in einer Zeitspanne vor sich geht, in der die Form ohnehin der Werkstückentnahme geöffnet sein muß.It will readily be appreciated that the air displaced by the melt 5 in front of the casting piston 8 at the beginning of the process described in FIG. 3 in front of the metal front, which is still in the part of the riser 9 located above the level 4 and in the channel 24 of the Mouthpiece body is located without problems can escape from the still open form. The molten metal is filled very slowly and at low speed (in the embodiment about 0.1 meters per second) in the casting system, which is pre-filled in this way in the embodiment after two seconds. From this pre-filled casting system, which is indicated in Fig. 2 by the level 25, after closing the mold at the time t F, the shape itself can be filled very quickly and fektiv exclusively depending on the conditions given by the mold. The air present in the mold and the small proportion of air in the nozzle tip 14 (FIG. 2) do not hinder the escape of this small amount of air. In this way it is therefore possible that the produced die-cast part can be produced almost without air inclusions. It also becomes possible to comply with a shorter cycle time, because the prefilling operation for the casting system, which takes place in the time from zero to two seconds in FIG. 3, takes place in a period in which the mold must be opened anyway the workpiece removal ,

Mit dem neuen Verfahren können auch Druckgussteile mit geringerem Gewicht prozesssicher hergestellt werden.With the new process can also die castings with less Weight can be produced reliably.

Claims (6)

  1. A method of operating a hot-chamber diecasting machine, wherein molten metal is fed chargewise by a reciprocating casting plunger (8) from a casting vessel (6) immersed in a metal bath (5), through the gooseneck (9) of the casting vessel (6) to a mouthpiece body (10) and a nozzle tip (14) and into a die (20), where it is placed under pressure, characterised in that, after each charge and with the die open, the casting plunger (8) is moved from a retracted position, in which it opens an inlet (12) from the metal bath (5) into the casting chamber (7) of the casting vessel (6), into an advanced position in which the gooseneck (9) and the mouthpiece body (10) are filled with molten metal, in that the die (20) is then closed and only after that is metal forced into the die.
  2. A method according to claim 1, characterised in that the arrival of the molten metal (5) at the nozzle tip is detected, the die-closing process is initiated and the casting plunger (8) is held stationary until the die is closed.
  3. A hot-chamber diecasting machine for carrying out the method according to claim 1, having a channel (24) provided in the mouthpiece body (10) and rising from the gooseneck (9) to the nozzle tip (14), and having a metal sensor arranged in the region of the nozzle tip (14), characterised in that the metal sensor (16) is mounted on the underside of the channel (24) of the mouthpiece body (10).
  4. A hot-chamber diecasting machine according to claim 3, characterised in that a control device (18) for detecting and evaluating the signal emitted by the metal sensor (16) is provided, which signal can be used as a starting signal for the commencement of the process of forcing metal into the die.
  5. A hot-chamber diecasting machine according to claim 4, characterised in that a casting-system prefilling curve is predetermined via the control device (18) and a process control means and, in a machine-specific manner, determines the prefilling time and the casting-plunger speed, including the braking process of the casting plunger.
  6. A hot-chamber diecasting machine according to any one of claims 3 to 5, characterised by the use of a multichamber furnace which ensures the same bath level in a discharge chamber.
EP01118778A 2001-08-09 2001-08-09 Method for operating a hot chamber die casting machine and die casting machine Expired - Lifetime EP1284168B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
AT01118778T ATE314169T1 (en) 2001-08-09 2001-08-09 METHOD FOR OPERATING A HOT CHAMBER DIE CASTING MACHINE AND DIE CASTING MACHINE
DE50108552T DE50108552D1 (en) 2001-08-09 2001-08-09 Method for operating a hot-chamber die casting machine and die casting machine
EP01118778A EP1284168B1 (en) 2001-08-09 2001-08-09 Method for operating a hot chamber die casting machine and die casting machine
ES01118778T ES2253309T3 (en) 2001-08-09 2001-08-09 PROCEDURE FOR THE OPERATION OF A HOT CAMERA PRESSURE MOLDER AND PRESSURE MOLDER.
CZ20022631A CZ298982B6 (en) 2001-08-09 2002-07-30 Method of operating a pressure die casting machine with a hot chamber and a pressure die casting machine for making the same
PL355407A PL202883B1 (en) 2001-08-09 2002-08-08 Hot-chamber die-casting machine operation process and a hot-chamber die-casting machine as such
JP2002231057A JP4307806B2 (en) 2001-08-09 2002-08-08 Driving method of hot chamber pressure casting machine and hot chamber pressure casting machine
US10/214,182 US6761209B2 (en) 2001-08-09 2002-08-08 Method of operating a hot-chamber pressure diecasting machine and a pressure diecasting machine
HK03104236A HK1051983A1 (en) 2001-08-09 2003-06-13 Method for operating a hot chamber die casting machine and die casting machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01118778A EP1284168B1 (en) 2001-08-09 2001-08-09 Method for operating a hot chamber die casting machine and die casting machine

Publications (2)

Publication Number Publication Date
EP1284168A1 EP1284168A1 (en) 2003-02-19
EP1284168B1 true EP1284168B1 (en) 2005-12-28

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EP01118778A Expired - Lifetime EP1284168B1 (en) 2001-08-09 2001-08-09 Method for operating a hot chamber die casting machine and die casting machine

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US (1) US6761209B2 (en)
EP (1) EP1284168B1 (en)
JP (1) JP4307806B2 (en)
AT (1) ATE314169T1 (en)
CZ (1) CZ298982B6 (en)
DE (1) DE50108552D1 (en)
ES (1) ES2253309T3 (en)
HK (1) HK1051983A1 (en)
PL (1) PL202883B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3919204A1 (en) 2020-06-04 2021-12-08 Oskar Frech GmbH + Co. KG Casting unit for a diecasting machine
DE102020207704A1 (en) 2020-06-22 2021-12-23 Oskar Frech Gmbh + Co. Kg Die casting machine and operating method
DE102020215665A1 (en) 2020-12-10 2022-06-15 Oskar Frech Gmbh + Co. Kg Die casting machine with shut-off valve in the melt inlet channel and method of operation

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JP2005329419A (en) * 2004-05-18 2005-12-02 Moriyama Giken:Kk Apparatus and method for forming metal with die casting
CN101277774A (en) * 2005-09-16 2008-10-01 乌尔佩马克有限公司 Injecting machine, adapter apparatus and injecting technique for mold injecting machine
JP4753099B2 (en) * 2008-09-01 2011-08-17 グンダイ株式会社 Hot chamber die casting machine
ITRE20130093A1 (en) * 2013-12-16 2015-06-17 Eurofusioni Nironi S R L METHOD AND DIE-CASTING PLANT
CN104259448A (en) * 2014-10-14 2015-01-07 重庆大学 Casting method and device of magnesium alloy
ES2631502B1 (en) * 2016-09-06 2018-06-05 Comercial Nicem-Exinte, S.A - Coniex METAL INJECTION EQUIPMENT IN POLYMER MOLD, POLYMER MOLD USED AND ASSEMBLY OPERATING PROCEDURE

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US3270378A (en) * 1964-01-16 1966-09-06 Automatic Casting Corp Die casting apparatus
DE2922914A1 (en) 1979-06-06 1980-12-11 Oskar Frech Werkzeugbau Gmbh & METHOD AND ARRANGEMENT FOR CONTROLLING THE INPRESSION PROCESS IN COLD CHAMBER DIE CASTING MACHINES
DE4419848C1 (en) * 1994-06-07 1995-12-21 Frech Oskar Gmbh & Co Hot chamber die casting machine
JPH10235463A (en) * 1997-02-25 1998-09-08 Ykk Corp Injection molding machine and injection molding method
JP3770688B2 (en) * 1997-02-25 2006-04-26 Ｙｋｋ株式会社 Injection molding machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3919204A1 (en) 2020-06-04 2021-12-08 Oskar Frech GmbH + Co. KG Casting unit for a diecasting machine
DE102020207016A1 (en) 2020-06-04 2021-12-09 Oskar Frech Gmbh + Co. Kg Casting unit for a die casting machine
US11376656B2 (en) 2020-06-04 2022-07-05 Oskar Frech Gmbh + Co. Kg Casting unit for a die casting machine
DE102020207704A1 (en) 2020-06-22 2021-12-23 Oskar Frech Gmbh + Co. Kg Die casting machine and operating method
EP3928889A1 (en) 2020-06-22 2021-12-29 Oskar Frech GmbH + Co. KG Pressure die casting machine and method of operation
US11819911B2 (en) 2020-06-22 2023-11-21 Oskar Frech Gmbh + Co. Kg Die-casting machine and operating method
DE102020215665A1 (en) 2020-12-10 2022-06-15 Oskar Frech Gmbh + Co. Kg Die casting machine with shut-off valve in the melt inlet channel and method of operation
WO2022122496A1 (en) 2020-12-10 2022-06-16 Oskar Frech Gmbh + Co. Kg Pressure die-casting machine having a shut-off valve in the melt inlet channel, and operating method

Also Published As

Publication number Publication date
US6761209B2 (en) 2004-07-13
CZ20022631A3 (en) 2003-03-12
CZ298982B6 (en) 2008-03-26
PL355407A1 (en) 2003-02-10
PL202883B1 (en) 2009-07-31
HK1051983A1 (en) 2003-08-29
JP2003053507A (en) 2003-02-26
DE50108552D1 (en) 2006-02-02
EP1284168A1 (en) 2003-02-19
JP4307806B2 (en) 2009-08-05
ATE314169T1 (en) 2006-01-15
ES2253309T3 (en) 2006-06-01
US20030029596A1 (en) 2003-02-13

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