WO2006089442A1 - Casting chamber - Google Patents

Casting chamber Download PDF

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Publication number
WO2006089442A1
WO2006089442A1 PCT/CH2006/000104 CH2006000104W WO2006089442A1 WO 2006089442 A1 WO2006089442 A1 WO 2006089442A1 CH 2006000104 W CH2006000104 W CH 2006000104W WO 2006089442 A1 WO2006089442 A1 WO 2006089442A1
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WO
WIPO (PCT)
Prior art keywords
casting chamber
casting
inner tube
filling opening
chamber
Prior art date
Application number
PCT/CH2006/000104
Other languages
German (de)
French (fr)
Inventor
Bernhard Fritsche
Bernd Watzinger
Original Assignee
Bühler Druckguss AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bühler Druckguss AG filed Critical Bühler Druckguss AG
Priority to US11/884,429 priority Critical patent/US20080277088A1/en
Priority to EP06705344A priority patent/EP1853398A1/en
Priority to JP2007557305A priority patent/JP2008531290A/en
Publication of WO2006089442A1 publication Critical patent/WO2006089442A1/en

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Classifications

    • 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
    • B22D17/2015—Means for forcing the molten metal into the die
    • B22D17/2023—Nozzles or shot sleeves
    • 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
    • B22D17/14—Machines with evacuated die cavity

Definitions

  • the invention relates to a casting chamber for pressure casting of metallic materials in a die casting machine.
  • a die casting machine has at least one movable and a stationary mold part, which are divided along a parting plane, and a mold cavity enclosed by these mold parts.
  • This mold cavity to be cast metal is injected via a runner of the mold by means of a casting piston.
  • the casting piston is displaceable in a casting chamber, into which the metal to be cast is insertable, by means of a drive along the longitudinal axis of the casting chamber.
  • Such die casting machine is z.
  • the production cost of such a highly loaded casting chamber is correspondingly high.
  • the filling opening opposite surface of the casting chamber is affected and at a dosage from below, especially the transition region of the filling itself. A consequence are surface erosion, clamping the casting piston and changing the casting chamber.
  • EP-A-477119 It is also known in sand molds to provide a sprue with a heavy-duty, replaceable insert (EP-A-477119). The same describes EP-A-703027.
  • the invention has the object of providing a generic casting chamber in such a way that in comparison to the prior art, a better thermal insulation of the casting chamber is achieved.
  • the invention is based on the recognition that a heat-optimized casting chamber can be achieved by passive measures.
  • the casting chamber consists of an inner tube, on the outer surface of which an insulating layer is applied.
  • the coated inner tube is covered by a steel jacket.
  • the inner tube preferably with a wall thickness of only a few millimeters of a wear and heat-resistant steel and the outer steel shell of a cheaper tempered steel.
  • the inner tube is preferably coated with a thin ceramic layer, for example made of ZrO 2, and is preferably shrunk into the steel jacket.
  • the layer is applied by thermal spraying, eg plasma spraying.
  • a ceramic wear protection arrangement is provided in the inner tube below the filling opening for the molten metal to be cast, which is intended to prevent "washing out” of the inner wall of the inner tube
  • the wear protection arrangement can be designed as a plate or disk, for example, and closes flush with the surface of the inner tube.
  • the casting piston To the thermal benefits of a heated casting chamber, d. H. To use less pre-solidification in the casting chamber and the resulting higher component quality and lower rejects share, the casting piston must be moved at a higher temperature in the casting chamber. The temperature is adjusted so that, although a sufficiently thick ring of the melt solidifies (seal) but on the other hand, the lowest possible pre-solidification is ensured in the casting chamber. This requires the most accurate possible adjustment of the temperature of the casting piston at high cooling capacity, respectively. an intensive surface contact of the cooling medium with the casting piston.
  • the casting piston is cooled from the inside, preferably a water mist, wherein the evaporation enthalpy of the drops is used for the cooling.
  • Preference is given to a temperature below 400 0 C, so that the casting flask is maintained at a temperature below 400 0 C.
  • the temperature of the casting piston in a range of about 15O 0 C moves below 400 ° C.
  • the invention will be described below in an embodiment with reference to a drawing.
  • the drawing shows a casting chamber in section (schematized).
  • a stationary mold carrier is provided with a mold half attached thereto in a conventional manner.
  • a casting chamber 1 is arranged, in a known manner by means of a casting piston a not shown but familiar to those skilled drive and control device along the longitudinal axis of the casting chamber 1 is displaceable.
  • the metal to be cast passes via a filling opening 2 into the casting chamber 1.
  • the casting chamber 1 consists of three layers.
  • the inner layer forms an inner tube 3 with a wall thickness of a few millimeters, z. B. 5 mm, made of a high-strength steel, on the outer surface of which a thin, thermal insulation layer 4 of z. B. ZrO2 is applied.
  • the insulation layer 4 is applied by plasma spraying.
  • a ceramic wear protection ring 6 is embedded in the inner tube 3 on its opposite side.
  • the coated inner tube 3 is shrunk into a cylindrical, outer steel shell 5 made of a tempering steel.
  • the temperature of the casting chamber 1 is set to a value between 400 0 C and 700 0 C depending on the material to be cast.
  • Superheated water mist in which the temperature of the casting piston is also dependent on the material adjusted to a value between 150 ° C and 400 0 C is fed with pressure into the interior of the casting piston through a carburetor.
  • the casting piston is made of steel in combination with copper and / or titanium alloys.

Abstract

Disclosed is a casting chamber (1) of a die casting machine, comprising an inlet (2) and a casting plunger which is arranged so as to be movable along the longitudinal axis of the casting chamber (1). The casting chamber (1) is composed of an inner tube (3) which is coated with a thermally insulating layer and is shrunk into a steel jacket (5).

Description

Giesskammer casting chamber
Die Erfindung betrifft eine Giesskammer zum Druckgiessen metallischer Werkstoffe in einer Druckgiessmaschine.The invention relates to a casting chamber for pressure casting of metallic materials in a die casting machine.
Eine Druckgiessmaschine weist wenigstens einen beweglichen und einen stationären Formteil auf, die entlang einer Trennebene geteilt sind, und einen, von diesen Formteilen umschlossenen Formhohlraum. In diesen Formhohlraum wird ein zu vergiessendes Metall über einen Angusskanal der Form mittels eines Giesskolbens eingeschossen. Der Giesskolben ist in einer Giesskammer, in die das zu vergiessende Metall einführbar ist, mit Hilfe eines Antriebes entlang der Längsachse der Giesskammer verschiebbar. Eine solche Druckgiessmaschine ist z. B. der CH-A-689156 entnehmbar.A die casting machine has at least one movable and a stationary mold part, which are divided along a parting plane, and a mold cavity enclosed by these mold parts. In this mold cavity to be cast metal is injected via a runner of the mold by means of a casting piston. The casting piston is displaceable in a casting chamber, into which the metal to be cast is insertable, by means of a drive along the longitudinal axis of the casting chamber. Such die casting machine is z. Example, the CH-A-689156 removable.
Die Einführung des zu vergiessenden Metalls in die Giesskammer erfolgt über muldenförmige Öffnungen der Giesskammer, schräg bis senkrecht zur Längsachse der Giesskammer. Der Herstellungsaufwand einer solchen hochbelasteten Giesskammer ist entsprechend hoch. Die hohe Beanspruchung des Teiles der Giesskammer, der die Einfüllöffnung des vergiessenden Metalls enthält, ergibt sich vor allem aus spezifischen Auswaschungen in Abhängigkeit von der Art der Dosierung. Bei einer Dosierung von oben ist die der Einfüllöffnung gegenüberliegende Fläche der Giesskammer betroffen und bei einer Dosierung von unten vor allem der Übergangsbereich der Einfüllöffnung selbst. Eine Folge sind Abtragungen der Oberfläche, Klemmen des Giesskolbens und Wechsel der Giesskammer.The introduction of the metal to be cast in the casting chamber via trough-shaped openings of the casting chamber, obliquely to perpendicular to the longitudinal axis of the casting chamber. The production cost of such a highly loaded casting chamber is correspondingly high. The high stress of the part of the casting chamber, which contains the filling opening of the pouring metal, results mainly from specific washouts depending on the type of dosage. In a metering from above, the filling opening opposite surface of the casting chamber is affected and at a dosage from below, especially the transition region of the filling itself. A consequence are surface erosion, clamping the casting piston and changing the casting chamber.
Neben einteiligen Giesskammem wurden auch zweiteilig ausgeführte Giesskammem vorgeschlagen, um Werkstoffeinsatz und Hersteilungsaufwand zu optimieren, insbesondere im Hinblick auf den höherbelasteten Teil der Giesskammer, der die Einfüllöffnung enthält. Dies ermöglicht eine Auswechslung des früher verschleissenden Teiles der Giesskammer. Der Nachteil einer solchen zweiteiligen Ausführung ist in erhöhtem Montageaufwand und einer grosseren Teilezahl zu sehen. Dem Stand der Technik sind Giessbehälter für Druckgiessmaschinen (DE-C-4439871 ) entnehmbar, die einen Kanal mit einem Überleitungsstück aufweisen, wobei das Überleitungsstück als Büchse ausgebildet ist und auswechselbar in einer Aufnahme des Giessbehälters gehalten ist.In addition to one-piece Giesskammem also two-piece Giesskammem were proposed to optimize material usage and Hersteilungsaufwand, especially with regard to the higher loaded part of the casting chamber containing the filling opening. This allows a replacement of the formerly wearing part of the casting chamber. The disadvantage of such a two-part design can be seen in increased assembly costs and a larger number of parts. The prior art, casting containers for die casting machines (DE-C-4439871) can be removed, which have a channel with a transfer piece, wherein the transfer piece is designed as a sleeve and is interchangeable held in a receptacle of the casting container.
Ebenso ist es bei Sand-Giessformen bekannt, einen Eingusskanal mit einem hochbelastbaren, auswechselbaren Einsatzteil zu versehen (EP-A-477119). Ähnliches beschreibt die EP-A-703027.It is also known in sand molds to provide a sprue with a heavy-duty, replaceable insert (EP-A-477119). The same describes EP-A-703027.
Es ist weiterhin bekannt, Giesskammem oder Förderstränge mit dicken, thermischen Isolationsschichten zu versehen, sowohl in Sandwichausführung als auch als äussere Umhüllung, wobei die Isolation möglichst durchgängig angebracht ist. Einfüllöffnungen bilden dabei aufwändige Unterbrüche.It is also known to provide Giesskammem or conveyor strands with thick, thermal insulation layers, both in sandwich execution as well as an outer envelope, the insulation is as consistently as possible. Filling openings form time-consuming interruptions.
Der Erfindung liegt die Aufgabe zugrunde, eine gattungsgemässe Giesskammer so auszubilden, dass im Vergleich zum Stand der Technik eine bessere thermische Isolation der Giesskammer erreicht wird.The invention has the object of providing a generic casting chamber in such a way that in comparison to the prior art, a better thermal insulation of the casting chamber is achieved.
Die Aufgabe ist durch die kennzeichnenden Merkmale des Patentanspruches gelöst.The problem is solved by the characterizing features of claim.
Die Erfindung geht von der Erkenntnis aus, dass eine wärmeoptimierte Giesskammer durch passive Massnahmen erreichbar ist. Die Giesskammer besteht aus einem Innenrohr, auf dessen äussere Mantelfläche eine Isolationsschicht aufgetragen ist. Das beschichtete Innenrohr ist von einem Stahlmantel umhüllt.The invention is based on the recognition that a heat-optimized casting chamber can be achieved by passive measures. The casting chamber consists of an inner tube, on the outer surface of which an insulating layer is applied. The coated inner tube is covered by a steel jacket.
Besonders vorteilhafte Ausgestaltungen sind mit den Merkmalen der nachgeordneten Ansprüche gelöst.Particularly advantageous embodiments are achieved with the features of the subordinate claims.
So besteht nur das Innenrohr, bevorzugt mit einer Wandstärke von nur wenigen Millimetern aus einem verschleiss- und hitzebeständigen Stahl und der äussere Stahlmantel aus einem günstigeren Vergütungsstahl. Das Innenrohr ist bevorzugt mit einer dünnen Keramikschicht, zum Beispiel aus ZrO2 beschichtet und ist bevorzugt in den Stahlmantel eingeschrumpft. Der Schichtauftrag erfolgt durch thermisches Spritzen, z.B. Plasmasprühen.Thus, only the inner tube, preferably with a wall thickness of only a few millimeters of a wear and heat-resistant steel and the outer steel shell of a cheaper tempered steel. The inner tube is preferably coated with a thin ceramic layer, for example made of ZrO 2, and is preferably shrunk into the steel jacket. The layer is applied by thermal spraying, eg plasma spraying.
Unter der Einfüllöffnung für die zu vergiessende Metallschmelze ist im Innenrohr eine keramische Verschleissschutzanordnung vorgesehen, die ein „Auswaschen" der Innenwand des Innenrohres verhindern soll. Die Verschleissschutzanordnung kann zum Beispiel als Platte oder Scheibe ausgebildet sein und schliesst bündig mit der Oberfläche des Innenrohres ab.A ceramic wear protection arrangement is provided in the inner tube below the filling opening for the molten metal to be cast, which is intended to prevent "washing out" of the inner wall of the inner tube The wear protection arrangement can be designed as a plate or disk, for example, and closes flush with the surface of the inner tube.
Um die thermischen Vorteile einer beheizten Giesskammer, d. h. weniger Vorerstarrung in der Giesskammer und daraus resultierend höhere Bauteilqualität und geringerer Ausschussanteil, nutzen zu können, muss der Giesskolben mit höherer Temperatur in der Giesskammer verfahren werden. Die Temperatur ist so einzustellen, dass zwar ein ausreichend dicker Ring aus der Schmelze erstarrt (Dichtung) aber andererseits eine möglichst geringe Vorerstarrung in der Giesskammer gewährleistet ist. Dies erfordert eine möglichst genaue Einstellung der Temperatur des Giesskolbens bei hoher Kühlleistung resp. einen intensiven Oberflächenkontakt des Kühlmediums mit dem Giesskolben.To the thermal benefits of a heated casting chamber, d. H. To use less pre-solidification in the casting chamber and the resulting higher component quality and lower rejects share, the casting piston must be moved at a higher temperature in the casting chamber. The temperature is adjusted so that, although a sufficiently thick ring of the melt solidifies (seal) but on the other hand, the lowest possible pre-solidification is ensured in the casting chamber. This requires the most accurate possible adjustment of the temperature of the casting piston at high cooling capacity, respectively. an intensive surface contact of the cooling medium with the casting piston.
Erfindungsgemäss wird der Giesskolben von innen gekühlt, bevorzugt ist ein Wassernebel, wobei die Verdampfungsenthalpie der Tropfen für die Kühlung verwendet wird. Bevorzugt wird eine Temperatur unterhalb 4000C, so dass der Giesskolben auf einer Temperatur unterhalb 4000C gehalten wird. Bevorzugt bewegt sich die Temperatur des Giesskolbens in einem Bereich von ca. 15O0C bis unterhalb 400°C.According to the invention, the casting piston is cooled from the inside, preferably a water mist, wherein the evaporation enthalpy of the drops is used for the cooling. Preference is given to a temperature below 400 0 C, so that the casting flask is maintained at a temperature below 400 0 C. Preferably, the temperature of the casting piston in a range of about 15O 0 C moves below 400 ° C.
Alternativ ist es auch denkbar anstelle der Isolationsschicht eine Heizung vorzusehen.Alternatively, it is also conceivable to provide a heater instead of the insulating layer.
Die Erfindung wird nachfolgend in einem Ausführungsbeispiel an Hand einer Zeichnung näher beschrieben. Die Zeichnung zeigt eine Giesskammer im Schnitt (schematisiert).The invention will be described below in an embodiment with reference to a drawing. The drawing shows a casting chamber in section (schematized).
An einer nicht dargestellten Druckgiessmaschine ist ein stationärer Formträger mit einer daran befestigten Formhälfte in an sich bekannter Weise vorgesehen. An diesen Teilen ist eine Giesskammer 1 angeordnet, in der in bekannter Weise ein Giesskolben mittels einer nicht dargestellten aber dem Fachmann geläufigen Antriebs- und Steuereinrichtung entlang der Längsachse der Giesskammer 1 verschiebbar ist. Das zu vergiessen- de Metall gelangt über eine Einfüllöffnung 2 in die Giesskammer 1.At a die casting machine, not shown, a stationary mold carrier is provided with a mold half attached thereto in a conventional manner. At these parts, a casting chamber 1 is arranged, in a known manner by means of a casting piston a not shown but familiar to those skilled drive and control device along the longitudinal axis of the casting chamber 1 is displaceable. The metal to be cast passes via a filling opening 2 into the casting chamber 1.
Die Giesskammer 1 besteht aus drei Schichten. Die innere Schicht bildet ein Innenrohr 3 mit einer Wandstärke von wenigen Millimetern, z. B. 5 mm, aus einem hochfesten Stahl, auf dessen äussere Mantelfläche eine dünne, thermische Isolationsschicht 4 aus z. B. ZrO2 aufgebracht ist. Die Isolationsschicht 4 ist mittels Plasmasprühen aufgebracht. Im Bereich der Einfüllö.ffnung 2 ist an deren gegenüberliegender Seite ein keramischer Verschleissschutzring 6 in das Innenrohr 3 eingelassen.The casting chamber 1 consists of three layers. The inner layer forms an inner tube 3 with a wall thickness of a few millimeters, z. B. 5 mm, made of a high-strength steel, on the outer surface of which a thin, thermal insulation layer 4 of z. B. ZrO2 is applied. The insulation layer 4 is applied by plasma spraying. In the region of the filling opening 2, a ceramic wear protection ring 6 is embedded in the inner tube 3 on its opposite side.
Das beschichtete Innenrohr 3 ist in einen zylindrischen, äusseren Stahlmantel 5 aus einem Vergütungsstahl eingeschrumpft.The coated inner tube 3 is shrunk into a cylindrical, outer steel shell 5 made of a tempering steel.
Die Temperatur der Giesskammer 1 wird in Abhängigkeit vom zu vergiessenden Werkstoff auf einen Wert zwischen 4000C und 7000C eingestellt.The temperature of the casting chamber 1 is set to a value between 400 0 C and 700 0 C depending on the material to be cast.
Über einen Vergaser wird überhitzter Wassernebel mit Druck in das Innere des Giess- kolbens geleitet, wobei die Temperatur des Giesskolbens ebenfalls werkstoffabhängig auf einen Wert zwischen 150°C und 4000C eingestellt wird. Der Giesskolben besteht aus Stahl in Kombination mit Kupfer- und/oder Titanlegierungen. Superheated water mist in which the temperature of the casting piston is also dependent on the material adjusted to a value between 150 ° C and 400 0 C is fed with pressure into the interior of the casting piston through a carburetor. The casting piston is made of steel in combination with copper and / or titanium alloys.
Bezugszeichenreference numeral
Giesskammer Einfüllöffnung Innenrohr Isolationsschicht Stahlmantel Verschleissschutzring Casting chamber Filling opening Inner tube Insulation layer Steel jacket Wear protection ring

Claims

Patentansprüche claims
1. Giesskammer, insbesondere eine Giesskammer (1) einer Druckgiessmasch mit einer Einfüllöffnung (2) für das zu vergiessende Metall sowie einem Giesskol- ben, der mittels einer Antriebs- und Steuereinrichtung entlang der Längsachse der Giesskammer (1). verschiebbar angeordnet ist, dadurch gekennzeichnet, dass die Giesskammer ein Innenrohr (3) aufweist, auf dessen äussere Mantelfläche eine thermische Isolationsschicht (4) aufgetragen ist, wobei das Innenrohr (3) von einem Stahlmantel (5) umhüllt ist.1. casting chamber, in particular a casting chamber (1) of a pressure casting machine with a filling opening (2) for the metal to be cast and a casting piston, which by means of a drive and control device along the longitudinal axis of the casting chamber (1) . slidably disposed, characterized in that the casting chamber has an inner tube (3), on the outer lateral surface of a thermal insulation layer (4) is applied, wherein the inner tube (3) by a steel shell (5) is enveloped.
2. Giesskammer nach Anspruch 1 , dadurch gekennzeichnet, dass das Innenrohr (3) und der Stahlmantel (5) aus unterschiedlichen metallischen Werkstoffen bestehen.2. casting chamber according to claim 1, characterized in that the inner tube (3) and the steel shell (5) consist of different metallic materials.
3. Giesskammer nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Isolationsschicht (4) ein keramischer Werkstoff ist, bevorzugt ZrO2.3. casting chamber according to claim 1 or 2, characterized in that the insulating layer (4) is a ceramic material, preferably ZrO2.
4. Giesskammer nach Anspruch 3, dadurch gekennzeichnet, dass im Innenrohr (3), der Einfüllöffnung (2) gegenüberliegend ein Verschleissschutzelement eingelassen ist.4. casting chamber according to claim 3, characterized in that in the inner tube (3), the filling opening (2) opposite a Verschleissschutzelement is inserted.
5. Verfahren zur Herstellung einer Giesskammer nach den Ansprüchen 1 bis 4, gekennzeichnet durch die Verfahrensschritte:5. A process for producing a casting chamber according to claims 1 to 4, characterized by the method steps:
> Beschichtung der äusseren Mantelfläche eines Innenrohres (3) mit einer thermischen Isolationsschicht (4) und> Coating of the outer surface of an inner tube (3) with a thermal insulation layer (4) and
> nachfolgendes Einschrumpfen des beschichteten Innenrohres (3) in einen Stahlmantel (5). Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass vor dem beschichten des Innenrohres (3) ein Verschleissschutzelement in die, einer Einfüllöffnung (2) gegenüberliegenden Seite des Innenrohres (3) angeordnet wird. > subsequent shrinking of the coated inner tube (3) in a steel jacket (5). A method according to claim 5, characterized in that before the coating of the inner tube (3) a wear protection element in the, a filling opening (2) opposite side of the inner tube (3) is arranged.
PCT/CH2006/000104 2005-02-28 2006-02-17 Casting chamber WO2006089442A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US11/884,429 US20080277088A1 (en) 2005-02-28 2006-02-17 Casting Chamber
EP06705344A EP1853398A1 (en) 2005-02-28 2006-02-17 Casting chamber
JP2007557305A JP2008531290A (en) 2005-02-28 2006-02-17 Pressurization chamber

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005009669A DE102005009669A1 (en) 2005-02-28 2005-02-28 Casting chamber, especially for a pressure casting machine with a charging opening for the metal and a casting piston, used in pressure casting of metals, has heat insulating layer on surface of its outer envelope
DE102005009669.7 2005-02-28

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WO2006089442A1 true WO2006089442A1 (en) 2006-08-31

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DE (1) DE102005009669A1 (en)
WO (1) WO2006089442A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102010041592A1 (en) * 2010-09-29 2012-03-29 Bayerische Motoren Werke Aktiengesellschaft Apparatus, useful for filling a liquid melt into a casting chamber of a die casting machine, comprises a wall having inner surface, whose edge region forms circumferential, closed contour of outlet opening, and outlet opening
EP2620238A1 (en) 2012-01-26 2013-07-31 Bühler AG Casting chamber for a die-casting machine
WO2013110485A1 (en) 2012-01-26 2013-08-01 Bühler AG Casting chamber for diecasting machine

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JP2008531290A (en) 2008-08-14
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US20080277088A1 (en) 2008-11-13

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