EP0714331B1 - Operation of a hot-chamber die-casting machine, and a die-casting machine operated in this way - Google Patents

Operation of a hot-chamber die-casting machine, and a die-casting machine operated in this way Download PDF

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Publication number
EP0714331B1
EP0714331B1 EP95920872A EP95920872A EP0714331B1 EP 0714331 B1 EP0714331 B1 EP 0714331B1 EP 95920872 A EP95920872 A EP 95920872A EP 95920872 A EP95920872 A EP 95920872A EP 0714331 B1 EP0714331 B1 EP 0714331B1
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Prior art keywords
casting machine
hot
chamber die
die casting
control device
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EP95920872A
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German (de)
French (fr)
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EP0714331A1 (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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    • 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 hot chamber die casting machine according to the preamble of claim 1.
  • Hot chamber die casting machines of this type are known (DE-AS 21 43 937). In these machines, the one that is immersed in the melt Casting container with a casting cylinder with a riser hole and provided with a mouthpiece body attached to it, which can be led up to the shape.
  • the bath level is one with these hot chamber die casting machines of the main disturbances.
  • a different bathroom level can be too different filling processes in the printing form. Is the bathroom mirror e.g. too high, then the mold cavity already becomes filled during the first phase. If it is too low, then come the start of the second phase already in the casting container or in the mouthpiece body and there is an empty shot that leads to high pressure peaks can lead.
  • the object of the invention is to overcome these disadvantages avoid.
  • To solve this problem are in a hot chamber die casting machine of the type mentioned at the outset Features of claim 1 provided.
  • the position of the metal front can be grasped exactly, so that from this point on the further material flow via sprue pins and sprue channels can be clearly determined.
  • the press-in process via - known per se - highly dynamic continuous valves can be controlled with switching times between 1 to 5ms operated by the control device and one to the product allow adapted speed and pressure control.
  • This configuration can in particular if the Control device designed as digital control electronics digital speed and pressure control is achieved that allows it to be used throughout the filling process Approach different points at different speeds.
  • the reprint is also freely selectable.
  • the form can also be an evacuation device with a vacuum pump and with one of these upstream Be assigned to the valve by the control device is additionally operated. It can also be provided that the nozzle tip can be inserted into a receptacle of the mouthpiece body is, so that the metal sensor then in this recording space the mouthpiece body is inserted. Then it stays the possibility of providing different nozzle tips without need to change the arrangement of the metal sensor.
  • those provided as metal sensors that are non-contact work, such as corresponding to the metal front Magnetic field sensors or ultrasonic sensors then exist at Installation also no sealing problems, as with sensors that triggered when touching the metal front because of the high pressures and temperatures can occur.
  • the casting container (2) has a riser hole (4), the upper end of which is conical Has a receiving opening for inserting a mouthpiece body (5), which can be heated in a known manner and which on his a conical end facing away from the insertion opening (6) Has receptacle (7) for a nozzle tip (8) in the shape (9) protrudes, the sprue channels (10) in the actual Pass over the molding space (11).
  • a metal sensor (13) which is connected via a connecting cable (14) is connected to a control device (15) which consists of the Fig. 2 can be seen.
  • the metal beam reaches the metal sensor during the casting process (13) at the tip of the mouthpiece body (5), then in the exact course of the mold filling process is sensitive to be controlled. Uncertainties where the metal beam does not exist.
  • the touch metal sensor shown could also be non-contact sensors be provided, which does not lead into the metal beam and must be sealed against it, but in Insert blind holes that are closed to the metal flow.
  • Such sensors could e.g. Magnetic field sensors or also Be ultrasonic sensors.
  • Fig. 2 shows that the piston rod (3) of the casting piston of a press cylinder (16) is guided, on the outflow side Valve (17) is arranged, which is known as a highly dynamic Continuous valve is formed.
  • This valve (17) is operated via a two-stage pilot valve (18) if A corresponding pulse comes from the control device (15).
  • the control device (15) is designed as digital control electronics trained and in it e.g. the setpoints for six Phases of the press-in process are saved for generation of a certain product.
  • the control device (15) enables real-time control and maintains it Start impulses for this time control on the one hand from the metal sensor (13), but it can also be from a path-dependent one Obtained scanner (19) which e.g.
  • a suitable device (20) is connected to the plunger of the press cylinder (16), so that whose position within the press cylinder (16) can be detected. It there is also the possibility of increasing the pressure at the nozzle tip by a sensor in the hydraulics and thus initiate the signal for the start of the second phase, in which increases the pressure significantly.
  • Both the path dependent Values as well as the signals from the metal sensor (13) can be found in known manner also additionally a screen (21) are supplied with a graphic display of the respective Casting parameters enabled.
  • the control device (15) can also be connected to a valve (22), which is one not shown, the form (11) downstream vacuum device is connected upstream and can prevent that from the evacuated metal flowing into the ventilation ducts Vacuum pump arrives.
  • the control valve (17) on the drain side of the casting cylinder is attached, works in the filling phase as a speed control valve.
  • the speed is a function programmed the pouring plunger position and the corresponding actual values can via the device (19) on the screen and be given to the control device.
  • the continuous valve is a pressure control valve.
  • the corresponding Setpoints for distance, speed and pressure are given to the control device entered. With those received from the metal sensor
  • the control device (15) can signal exact real-time control cause the press-in process, which is independent of the bath level inside the tub (1).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
  • Casting Devices For Molds (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

PCT No. PCT/EP95/01963 Sec. 371 Date Feb. 7, 1996 Sec. 102(e) Date Feb. 7, 1996 PCT Filed May 23, 1995 PCT Pub. No. WO95/33588 PCT Pub. Date Dec. 14, 1995In order to improve the compression operation and to produce better products with thin-walled castings, the invention calls for the compression operation to be divided into three phases and controlled by high-dynamic continuous-operation valves which have very short switching times and are actuated by a control device. Fitted in the hot-chamber die-casting machine for this purpose is a metal sensor which is disposed in a die relief leading from the rising bore in the casting container into the mould.

Description

Die Erfindung betrifft eine Warmkammer-Druckgießmaschine nach dem Oberbegriff des Patentanspruches 1.The invention relates to a hot chamber die casting machine according to the preamble of claim 1.

Warmkammer-Druckgießmaschinen dieser Art sind bekannt (DE-AS 21 43 937). Bei diesen Maschinen ist der in die Schmelze eintauchende Gießbehälter mit einem Gießzylinder mit einer Steigbohrung und mit einem daran angesetzten Mundstückskörper versehen, der bis zur Form geführt werden kann.Hot chamber die casting machines of this type are known (DE-AS 21 43 937). In these machines, the one that is immersed in the melt Casting container with a casting cylinder with a riser hole and provided with a mouthpiece body attached to it, which can be led up to the shape.

Es ist bekannt, daß der Druckgießvorgang zu den wirtschaftlichsten Fertigungsverfahren in der Gießereiindustrie zählt. Er wird mit Druckgießmaschinen durchgeführt, die den Einpreßvorgang in drei Phasen durchführen, um zu möglichst hohen Produktqualitäten zu kommen. Dabei ist es bekannt (DE-PS 29 22 914), zur Steuerung des Einpreßvorganges entweder wegabhängige Signale zu verwerten oder vom Einpreßdruck abhängige Signale, aus denen wiederum auf die jeweilige Stellung des Gießkolbens und auf den Füllungsgrad der Form geschlossen werden kann.It is known that the die casting process is the most economical Manufacturing processes in the foundry industry count. He is carried out with die casting machines, the pressing process perform in three phases to achieve the highest possible product quality get. It is known (DE-PS 29 22 914) to control the press-in process either path-dependent signals to utilize or signals dependent on the injection pressure which in turn on the respective position of the casting piston and the degree of filling of the mold can be concluded.

Es ist bei einer Kaltkammer-Druckgießmaschine (DE 42 16 773 A1) bekannt geworden, der Gießform einen Metallsensor zuzuordnen, der dort allerdings ausschließlich dazu dient, einer der Form nachgeschalteten Evakuiereinrichtung rechtzeitig ein Signal geben zu können, durch das ein vor der Vakuumpumpe sitzendes Ventil geschlossen wird, ehe Metallschmelze zur Vakuumpumpe gelangt. Andere Sensoren, die mit Temperaturfühlern arbeiten, sind bei solchen Kaltkammer-Druckgießmaschinen auch dem Gießzylinder zugeordnet worden, um über zwei Auswertekreise an einer Stelle wenigstens zwei Parameter abfühlen und auswerten zu können. Man hat für die Steuerung des Einpreßvorganges bei Kaltkammer-Druckgießmaschinen schließlich auch sogenannte Stetigventile eingesetzt, mit deren Hilfe die Bewegung des Gießkolbens und eines Multiplikatorkolbens über Weg, Geschwindigkeits-Meßeinrichtungen steuerbar ist, wobei ein Rechner zur Steuerung der Stetigventile verwendet wird (DE 42 18 556 A1).It is in a cold chamber die casting machine (DE 42 16 773 A1) become known to assign a metal sensor to the mold, which, however, only serves to form one give a signal to the downstream evacuation device in good time through the valve in front of the vacuum pump is closed before molten metal reaches the vacuum pump. Other sensors that work with temperature sensors are also the casting cylinder in such cold chamber die casting machines assigned to two evaluation circles on one Be able to sense and evaluate at least two parameters. One has for the control of the press-in process in cold chamber die casting machines finally also so-called continuous valves used, with the help of the movement of the casting piston and a multiplier piston over travel, speed measuring devices is controllable, with a computer for control the continuous valve is used (DE 42 18 556 A1).

Bei Warmkammer-Druckgießmaschinen der eingangs genannten Art liegen ganz andere Einbauverhältnisse vor. Es kann wesentlich weniger Platz zur Verfügung gestellt werden und die Temperaturen am Mundstück sind sehr hoch (ca. 400°C).In hot chamber die casting machines of the type mentioned there are completely different installation conditions. It can be essential less space will be made available and temperatures on the mouthpiece are very high (approx. 400 ° C).

Bei diesen Warmkammer-Druckgießmaschinen ist das Badniveau eine der Hauptstörgrößen. Ein unterschiedliches Badniveau kann zu unterschiedlichen Füllvorgängen in der Druckform führen. Ist der Badspiegel z.B. zu hoch, dann wird der Formhohlraum bereits während der ersten Phase gefüllt. Ist er zu niedrig, dann kommt der Start der zweiten Phase schon im Gießbehälter oder im Mundstückskörper und es entsteht ein Leerschuß, der zu hohen Druckspitzen führen kann.The bath level is one with these hot chamber die casting machines of the main disturbances. A different bathroom level can be too different filling processes in the printing form. Is the bathroom mirror e.g. too high, then the mold cavity already becomes filled during the first phase. If it is too low, then come the start of the second phase already in the casting container or in the mouthpiece body and there is an empty shot that leads to high pressure peaks can lead.

Der Erfindung liegt die Aufgabe zugrunde, diese Nachteile zu vermeiden. Zur Lösung dieser Aufgabe werden bei einer Warmkammer-Druckgießmaschine der eingangs genannten Art die kennzeichnenden Merkmale des Anspruches 1 vorgesehen. Durch diese Maßnahme kann die Lage der Metallfront exakt erfaßt werden, so daß ab diesem Zeitpunkt der weitere Materialfluß über Angußzapfen und Angußkanäle klar bestimmbar ist. Gleichzeitig kann der Einpreßvorgang über - an sich bekannte - hochdynamische Stetigventile mit Schaltzeiten zwischen 1 bis 5ms gesteuert werden, die von der Steuereinrichtung betätigt werden und eine an das Produkt angepaßte Geschwindigkeits- und Druckregelung ermöglichen. Durch diese Ausgestaltung kann insbesondere dann, wenn die Steuereinrichtung als eine digitale Steuerelektronik ausgebildet ist, eine digitale Geschwindigkeits- und Druckregelung erreicht werden, die es erlaubt, über den gesamten Füllvorgang verschiedene Punkte mit unterschiedlichen Geschwindigkeiten anzufahren. Auch der Nachdruck ist frei wählbar. Man kann dabei in an sich bekannter Weise mit Bildschirmen arbeiten, um die Gießparameter (Druck, Geschwindigkeit und Weg) zu überwachen. Es besteht auch die Möglichkeit, mit Hilfe einer zusätzlichen flexiblen Zeit eine Abgleichung der unterschiedlichen Formen bzw. Angußgestaltungen vorzunehmen. So wird es z.B. möglich, daß dann, wenn der Sensor Material erfaßt, man über die Gießparameter auf dem Bildschirm erkennt, daß die erste Phase noch etwas verlängert werden muß, um eine optimale Entlüftung zu gewährleisten. Dabei besteht der große Vorteil, daß im Gegensatz zu der vorher erwähnten Anordnung eines Metall-Sensors in der Form, der Sensor nun der Maschine an einer Stelle zugeordnet ist, die nahe der Angußbuchse der Form liegt, so daß es nicht notwendig wird, verschiedene Formen in umständlicher Weise jeweils mit einem Sensor zu versehen. Die Ausbildung der verschiedenen Formen kann, wie angedeutet, durch Einstellung einer empirisch ermittelten flexiblen Zeit berücksichtigt werden.The object of the invention is to overcome these disadvantages avoid. To solve this problem are in a hot chamber die casting machine of the type mentioned at the outset Features of claim 1 provided. By this measure the position of the metal front can be grasped exactly, so that from this point on the further material flow via sprue pins and sprue channels can be clearly determined. At the same time, the press-in process via - known per se - highly dynamic continuous valves can be controlled with switching times between 1 to 5ms operated by the control device and one to the product allow adapted speed and pressure control. This configuration can in particular if the Control device designed as digital control electronics digital speed and pressure control is achieved that allows it to be used throughout the filling process Approach different points at different speeds. The reprint is also freely selectable. You can do it work with screens in a manner known per se in order to Monitor casting parameters (pressure, speed and path). There is also the option of using an additional one flexible time a comparison of the different forms or make sprue designs. So it becomes e.g. possible, that when the sensor detects material, the casting parameters on the screen recognizes that the first phase is still something needs to be extended to ensure optimal ventilation guarantee. The big advantage is that in contrast to the aforementioned arrangement of a metal sensor in the shape, the sensor is now assigned to the machine at one point which is close to the sprue bush of the mold, so that it not necessary, different forms in awkward Way to provide each with a sensor. Training the various forms can, as indicated, by adjustment an empirically determined flexible time become.

In Weiterbildung der Erfindung kann der Form auch eine Evakuiereinrichtung mit einer Vakuumpumpe und mit einem dieser vorgeschalteten Ventil zugeordnet sein, das von der Steuereinrichtung zusätzlich betätigt wird. Es kann auch vorgesehen werden, daß die Düsenspitze in eine Aufnahme des Mundstückkörpers einsetzbar ist, so daß der Metallsensor dann in diesem Aufnahmeraum des Mundstückkörpers eingesetzt ist. Es bleibt dann auch die Möglichkeit, verschiedene Düsenspitzen vorzusehen, ohne eine Änderung der Anordnung des Metallsensors vornehmen zu müssen. Werden als Metallsensoren solche vorgesehen, die berührungslos arbeiten, wie z.B. auf die Metallfront entsprechende Magnetfeldsensoren oder Ultraschallsensoren, dann bestehen beim Einbau auch keine Abdichtprobleme, wie sie bei Sensoren, die bei Berührung mit der Metallfront ausgelöst werden, wegen der hohen Drücke und Temperaturen auftreten können.In a further development of the invention, the form can also be an evacuation device with a vacuum pump and with one of these upstream Be assigned to the valve by the control device is additionally operated. It can also be provided that the nozzle tip can be inserted into a receptacle of the mouthpiece body is, so that the metal sensor then in this recording space the mouthpiece body is inserted. Then it stays the possibility of providing different nozzle tips without need to change the arrangement of the metal sensor. Are those provided as metal sensors that are non-contact work, such as corresponding to the metal front Magnetic field sensors or ultrasonic sensors, then exist at Installation also no sealing problems, as with sensors that triggered when touching the metal front because of the high pressures and temperatures can occur.

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

Fig. 1
eine schematische Darstellung des Endes einer Steigbohrung eines Gießbehälters einer Warmkammer-Druckgießmaschine mit einem angesetzten Mundstückskörper, der bis in die Form reicht und an seinem mit einer Düsenspitze versehenen Ende einen Metallsensor aufweist und
Fig. 2
eine schematische Blockdarstellung der Regeleinrichtung für den Einpreßvorgang der Warmkammer-Druckgießmaschine der Fig. 1.
The invention is illustrated in the drawing using an exemplary embodiment and is explained below. Show it:
Fig. 1
is a schematic representation of the end of a riser bore of a casting tank of a hot chamber die casting machine with an attached mouthpiece body that extends into the shape and has a metal sensor at its end provided with a nozzle tip and
Fig. 2
2 shows a schematic block diagram of the control device for the press-in process of the hot chamber die casting machine of FIG. 1.

In der Fig. 1 ist das obere Ende eines in eine Gießwanne (1) eintauchenden Gießbehälters (2) gezeigt, der in nicht näher dargestellter Weise mit einem Gießkolben versehen ist, der über eine Antriebsstange (3) bewegbar ist. Der Gießbehälter (2) besitzt eine Steigbohrung (4), deren oberes Ende eine konische Aufnahmeöffnung zum Einsetzen eines Mundstückkörpers (5) besitzt, der in bekannter Weise beheizt sein kann und der an seinem von der Einsetzöffnung (6) abgewandten Ende eine konische Aufnahme (7) für eine Düsenspitze (8) aufweist, die in die Form (9) hereinragt, deren Angußkanäle (10) in den eigentlichen Formraum (11) übergehen. In den zwischen der konischen Aufnahme (7) und der Düsenspitze (8) gebildeten Aufnahmeraum (12) ragt ein Metallsensor (13) herein, der über ein Anschlußkabel (14) an eine Steuereinrichtung (15) angeschlossen ist, die aus der Fig. 2 erkennbar ist. 1 is the upper end of a in a tundish (1) immersed pouring container (2) shown, the in not closer illustrated manner is provided with a casting piston, which a drive rod (3) is movable. The casting container (2) has a riser hole (4), the upper end of which is conical Has a receiving opening for inserting a mouthpiece body (5), which can be heated in a known manner and which on his a conical end facing away from the insertion opening (6) Has receptacle (7) for a nozzle tip (8) in the shape (9) protrudes, the sprue channels (10) in the actual Pass over the molding space (11). In between the conical receptacle (7) and the nozzle tip (8) formed receiving space (12) protrudes a metal sensor (13) which is connected via a connecting cable (14) is connected to a control device (15) which consists of the Fig. 2 can be seen.

Erreicht daher der Metallstrahl beim Gießvorgang den Metallsensor (13) an der Spitze des Mundstückkörpers (5), dann kann in exakter Weise der weitere Verlauf des Formfüllvorganges feinfühlig gesteuert werden. Unsicherheiten, wo sich der Metallstrahl befindet, bestehen nicht. Anstelle des gezeigten Berührungs-Metallsensors könnten auch berührungslos arbeitende Sensoren vorgesehen sein, die nicht bis in den Metallstrahl hereingeführt und gegen diesen abgedichtet sein müssen, sondern in Sackbohrungen stecken, die zum Metallstrom geschlossen sind. Solche Sensoren könnten z.B. Magnetfeldsensoren oder auch Ultraschallsensoren sein.Therefore, the metal beam reaches the metal sensor during the casting process (13) at the tip of the mouthpiece body (5), then in the exact course of the mold filling process is sensitive to be controlled. Uncertainties where the metal beam does not exist. Instead of the touch metal sensor shown could also be non-contact sensors be provided, which does not lead into the metal beam and must be sealed against it, but in Insert blind holes that are closed to the metal flow. Such sensors could e.g. Magnetic field sensors or also Be ultrasonic sensors.

Die Fig. 2 zeigt, daß die Kolbenstange (3) des Gießkolbens von einem Preßzylinder (16) geführt wird, an dessen Abflußseite ein Ventil (17) angeordnet ist, das als ein an sich bekanntes hochdynamisches Stetigventil ausgebildet ist. Dieses Ventil (17) wird über ein zweistufiges Vorsteuerventil (18) betätigt, wenn von der Steuereinrichtung (15) ein entsprechender Impuls kommt. Die Steuereinrichtung (15) ist als eine digitale Steuerelektronik ausgebildet und in ihr können z.B. die Sollwerte für sechs Phasen des Einpreßvorganges gespeichert werden, die zur Erzeugung eines bestimmten Produktes vorgesehen werden. Die Steuereinrichtung (15) ermöglicht eine Echtzeitregelung und sie erhält Startimpulse für diese Zeitregelung zum einen von dem Metallsensor (13), kann sie aber auch von einer wegabhängig wirkenden Abtasteinrichtung (19) erhalten, die z.B. als Drehgeber ausgestaltet sein kann und über eine geeignete Einrichtung (20) mit dem Preßkolben des Preßzylinders (16) verbunden ist, so daß dessen Lage innerhalb des Preßzylinders (16) erfaßbar ist. Es besteht auch die Möglichkeit, den Druckanstieg an der Düsenspitze durch einen Sensor in der Hydraulik zu erfassen und damit das Signal für den Start der zweiten Phase einzuleiten, in der der Druck wesentlich erhöht wird. Sowohl die wegabhängigen Werte als auch die Signale des Metallsensors (13) können in an sich bekannter Weise auch noch zusätzlich einem Bildschirm (21) zugeführt werden, der eine graphische Anzeige der jeweiligen Gießparameter ermöglicht. Schließlich kann die Steuereinrichtung (15) auch mit einem Ventil (22) verbunden sein, das einer nicht gezeigten, der Form (11) nachgeschalteten Vakuumeinrichtung vorgeschaltet ist und verhindern kann, daß das aus der evakuierten Form in die Entlüftungskanäle strömende Metall zur Vakuumpumpe gelangt.Fig. 2 shows that the piston rod (3) of the casting piston of a press cylinder (16) is guided, on the outflow side Valve (17) is arranged, which is known as a highly dynamic Continuous valve is formed. This valve (17) is operated via a two-stage pilot valve (18) if A corresponding pulse comes from the control device (15). The control device (15) is designed as digital control electronics trained and in it e.g. the setpoints for six Phases of the press-in process are saved for generation of a certain product. The control device (15) enables real-time control and maintains it Start impulses for this time control on the one hand from the metal sensor (13), but it can also be from a path-dependent one Obtained scanner (19) which e.g. as an encoder can be configured and via a suitable device (20) is connected to the plunger of the press cylinder (16), so that whose position within the press cylinder (16) can be detected. It there is also the possibility of increasing the pressure at the nozzle tip by a sensor in the hydraulics and thus initiate the signal for the start of the second phase, in which increases the pressure significantly. Both the path dependent Values as well as the signals from the metal sensor (13) can be found in known manner also additionally a screen (21) are supplied with a graphic display of the respective Casting parameters enabled. Finally, the control device (15) can also be connected to a valve (22), which is one not shown, the form (11) downstream vacuum device is connected upstream and can prevent that from the evacuated metal flowing into the ventilation ducts Vacuum pump arrives.

Das Steuerventil (17), das auf der Abflußseite des Gießzylinders angebaut ist, arbeitet in der Füllphase als Geschwindigkeitsregelventil. Dabei wird die Geschwindigkeit als Funktion der Gießkolbenposition programmiert und die entsprechenden Istwerte können über die Einrichtung (19) auf den Bildschirm und zur Steuereinrichtung gegeben werden. In der Nachdruckphase arbeitet das Stetigventil als Druckregelventil. Die entsprechende Sollwerte für Weg, Geschwindigkeit und Druck werden der Steuereinrichtung eingegeben. Mit den vom Metallsensor erhaltenen Signalen kann die Steuereinrichtung (15) eine exakte Echtzeitregelung des Einpreßvorganges bewirken, die unabhängig ist von dem Badniveau innerhalb der Wanne (1).The control valve (17) on the drain side of the casting cylinder is attached, works in the filling phase as a speed control valve. The speed is a function programmed the pouring plunger position and the corresponding actual values can via the device (19) on the screen and be given to the control device. Works in the reprint phase the continuous valve as a pressure control valve. The corresponding Setpoints for distance, speed and pressure are given to the control device entered. With those received from the metal sensor The control device (15) can signal exact real-time control cause the press-in process, which is independent of the bath level inside the tub (1).

Claims (6)

  1. Hot-chamber die casting machine, in which the injection process is influenced by means of an electronic control device to which input signals originating from the injection unit are directed, and which is provided with a casting receptacle (2), which dips into the melt, with a vertical drilled hole (4) and with a mouthpiece element (5) which is fixed thereto and which is guided up to the mould (9) with a nozzle tip (8), characterised in that, in the region of the tip of the mouthpiece element (5), a metal sensor (13) is provided and is connected to the control device (15) and also directs input signals thereto, and in that there are provided high-dynamic continuous valves (17) which have switching times of between 1 and 5 ms for influencing the injection process, which are actuated by the control device (15) and which allow a regulation of speed and pressure adapted to the product.
  2. Hot-chamber die casting machine according to claim 1, characterised in that a nozzle tip (8) is insertable into a receiving member (7) of the mouthpiece element (5), and in that the metal sensor (13) is inserted in the receiving space (12) of the mouthpiece element (5) for the nozzle tip (8).
  3. Hot-chamber die casting machine according to claim 1, characterised in that an evacuation device having a vacuum pump and a valve (22), which is connected upstream of the vacuum pump and which is actuatable by the control device (15), is associated with the mould (9).
  4. Hot-chamber die casting machine according to claim 1, characterised in that there are provided metal sensors of the type which react in a contact-free manner to the presence of the metal melt.
  5. Hot-chamber die casting machine according to claim 4, characterised in that a magnetic field sensor is provided as the metal sensor.
  6. Hot-chamber die casting machine according to claim 1, characterised in that an electrical sensor (13), which is guided into the mouthpiece element (5) at a contact face, is provided as the metal sensor.
EP95920872A 1994-06-07 1995-05-23 Operation of a hot-chamber die-casting machine, and a die-casting machine operated in this way Expired - Lifetime EP0714331B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4419848A DE4419848C1 (en) 1994-06-07 1994-06-07 Hot chamber die casting machine
DE4419848 1994-06-07
PCT/EP1995/001963 WO1995033588A1 (en) 1994-06-07 1995-05-23 Operation of a hot-chamber die-casting machine, and a die-casting machine operated in this way

Publications (2)

Publication Number Publication Date
EP0714331A1 EP0714331A1 (en) 1996-06-05
EP0714331B1 true EP0714331B1 (en) 2000-03-22

Family

ID=6519979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95920872A Expired - Lifetime EP0714331B1 (en) 1994-06-07 1995-05-23 Operation of a hot-chamber die-casting machine, and a die-casting machine operated in this way

Country Status (7)

Country Link
US (1) US5699849A (en)
EP (1) EP0714331B1 (en)
JP (1) JP3824171B2 (en)
AT (1) ATE190880T1 (en)
DE (2) DE4419848C1 (en)
ES (1) ES2144612T3 (en)
WO (1) WO1995033588A1 (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19649621B4 (en) * 1996-11-29 2007-08-02 EWIKON Heißkanalsysteme GmbH & Co KG Connection arrangement for melt channel sections in hot runners
DE59906506D1 (en) * 1999-04-13 2003-09-11 Frech Oskar Gmbh & Co Hot chamber die casting machine
EP1097765A4 (en) * 1999-04-28 2005-02-09 Sumitomo Metal Ind Molten metal surface level control in mold in continuous casting
DE50009878D1 (en) * 2000-10-27 2005-04-28 Frech Oskar Gmbh & Co Kg Hot chamber die casting machine and method of operation therefor
JP4175602B2 (en) * 2001-07-02 2008-11-05 徹一 茂木 Casting pouring equipment
ATE314169T1 (en) 2001-08-09 2006-01-15 Frech Oskar Gmbh & Co Kg METHOD FOR OPERATING A HOT CHAMBER DIE CASTING MACHINE AND DIE CASTING MACHINE
CA2628504C (en) 2007-04-06 2015-05-26 Ashley Stone Device for casting
DE102011017610B3 (en) 2011-04-27 2012-06-21 Oskar Frech Gmbh + Co. Kg Casting piston and casting unit with shut-off valve
DE102015000738B3 (en) * 2015-01-21 2016-05-25 Audi Ag Hot chamber die casting plant

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Publication number Priority date Publication date Assignee Title
DE157168C (en) * 1903-05-23
DE2143937B2 (en) * 1971-09-02 1977-05-18 Oskar Frech, Werkzeugbau, 7061 Weiler CASTING CONTAINER FOR A HOT CHAMBER DIE CASTING MACHINE
DD157168A1 (en) * 1981-03-13 1982-10-20 Gerhard Losemann DEVICE FOR HYDRAULIC SPEED AND PRESSURE CONTROL IN INJECTION MOLDING MACHINES
DE3142811A1 (en) * 1981-10-28 1983-05-05 Idra Pressen GmbH, 7000 Stuttgart Method and apparatus for controlling the movement of a casting piston during the injection process on a die-casting machine
JPS6234659A (en) * 1985-08-09 1987-02-14 Hitachi Metals Ltd Method for changing over injection speed of die casting machine
JPS6340661A (en) * 1986-08-01 1988-02-22 Tanabe Kogyo Kk Supplying device for molten metal
DE3636936A1 (en) * 1986-10-30 1988-05-05 Buehler Ag Geb Sensor-controlled evaluation circuits for die casting machines - allows measurement of several parameters from one sensor probe improving control
DE3917487A1 (en) * 1989-05-30 1990-12-06 Frech Oskar Gmbh & Co CASTING CONTAINER FOR WARM CHAMBER DIE CASTING MACHINES
US5125450A (en) * 1990-05-07 1992-06-30 Electrovert Ltd. Method of and system for controlling flow of molten liquid to cast metal alloys
DE4216773A1 (en) * 1992-05-21 1993-11-25 Kurt Loeffler Druckgus Gmbh & Injection moulding appts. for metal vacuum injection moulding - comprises vent channel from mould cavity connected by valve to vacuum pump and metal sensor in injection channel and/or piston position switch to close vacuum valve
DE4218556A1 (en) * 1992-06-05 1993-12-09 Mueller Weingarten Maschf Method and device for carrying out the method for process control of a die casting machine

Also Published As

Publication number Publication date
JP3824171B2 (en) 2006-09-20
US5699849A (en) 1997-12-23
DE4419848C1 (en) 1995-12-21
ES2144612T3 (en) 2000-06-16
JPH09501360A (en) 1997-02-10
ATE190880T1 (en) 2000-04-15
WO1995033588A1 (en) 1995-12-14
DE59508044D1 (en) 2000-04-27
EP0714331A1 (en) 1996-06-05

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