EP0867247B1 - Process and apparatus for making composite cast pieces - Google Patents

Process and apparatus for making composite cast pieces Download PDF

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Publication number
EP0867247B1
EP0867247B1 EP19980890059 EP98890059A EP0867247B1 EP 0867247 B1 EP0867247 B1 EP 0867247B1 EP 19980890059 EP19980890059 EP 19980890059 EP 98890059 A EP98890059 A EP 98890059A EP 0867247 B1 EP0867247 B1 EP 0867247B1
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EP
European Patent Office
Prior art keywords
insert
projection
mould
tip
supporting
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EP19980890059
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German (de)
French (fr)
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EP0867247A1 (en
Inventor
Gerhard Ing. Mühlberger
Viktor Dipl.-Ing. Polasek
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TCG Unitech AG
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TCG Unitech AG
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00Casting in, on, or around objects which form part of the product

Definitions

  • the invention relates to a method and a mold arrangement according to claims 1 and 4 for the production of hybrid parts, in which an insert of metal is inserted into a mold consisting of at least two mold halves, and after closing the mold halves is held in a precisely determined position, whereupon liquid metal is poured into the mold, and the position of the insert through Two opposing support surfaces are defined, which are in different mold halves are formed (DE-B-1110371).
  • inserts are often fiber-reinforced.
  • the insert which is in one first process step is prefabricated, inserted into the mold and from the actual casting material cast around.
  • Such a method allows the production of hybrid parts from different Materials, each with optimized and coordinated properties.
  • workpieces can be made from a magnesium alloy exist and have an insert made of a different material. Therefore it enables such a process, a workpiece at highly stressed areas with fiber reinforcement to be provided, while parts with lower loads are not reinforced for cost reasons are.
  • DE 39 32 562 A relates to a device for producing light metal pistons for Internal combustion engines.
  • An insert is provided between a mold half and a salt core is arranged.
  • To prevent the salt core from floating, is supported on the opposite half of the mold with pin-like approaches. A play-free storage of salt core and insert is difficult with this device reachable.
  • DE 40 17 955 A and DE 41 32 091 A also describe processes for the production of Cast workpieces made of different materials.
  • EP 0 356 768 A and DE 36 20 510 A describe processes for the production known from castings, which are partially fiber-reinforced.
  • the object of the present invention is to provide a method in which an accurate and secure positioning of inserts is guaranteed even if certain tolerances occur in the dimensions of the shape or insert, with a global Deformation of the inserts is avoided.
  • this is achieved in that at least one with a support surface protrudes a tip provided, and that with closed mold halves, the distance the tip of the projection to the opposite support surface is smaller than the minimum Extension of the insert in this direction and that the distance between the two support surfaces is greater than the corresponding maximum extent of the insert in this direction whereby the insertion part is deformed only when the mold halves are closed in the area of penetration of the protruding locus provided with a tip.
  • the material of the tip of the projection is significantly harder than that of the insert.
  • the method according to the invention is fundamentally suitable for all casting methods which are associated with work two or more mold halves, at least one of which is movable, such as that Diecast.
  • the invention is particularly suitable for the so-called SC (shot control) processes, in which the piston stroke is controlled during the casting process.
  • the shape of the support surfaces basically depends on the shape of the workpiece to be manufactured. Is it the insert, for example around a ring, at least three tips are required. In those described here Examples are based on parallel support surfaces, but not absolutely must be the case.
  • the inventive method ensures that the Insert in a mold half rests securely on a support surface, creating a precisely defined one Position of the insert is reached. The tip presses against the other support surface of the projection in the insert, as far as is necessary.
  • the dimensions of the individual components are chosen so that when using an insert with a dimension at the lower tolerance limit the tip of the projection in the Insert penetrates so far that a secure hold is guaranteed. Is the Dimension of the insert at the upper tolerance limit, then the protrusion continues one, the corresponding support surface being very close to the insert, or at most lightly touched.
  • Another advantage of the invention is that the force is defined with which the Insert is clamped between the support surfaces. This tension cannot Only a safe concern can be achieved, for example, with a thermocouple, it can also be one Overloading of the component and the molding can be prevented.
  • the insert is preheated to a predetermined temperature. In this way a metallic connection of the materials can be achieved, which improves the strength properties improved.
  • the invention further relates to a mold arrangement for producing hybrid parts, with at least two mold halves, with support surfaces for different mold halves Holding an insert are formed.
  • This shape arrangement is according to the invention characterized in that from a support surface at least one with a tip Projection protrudes, and wherein the distance of the tip of the projection to the opposite Support area is smaller than the minimum extent of the insert in this direction and that the distance between the two support surfaces is greater than the corresponding one maximum extension of the insert part in this direction, the deformation of the insert part remaining locally limited to the area around the tip of the projection.
  • the Tip be conical or pyramid-shaped.
  • the protrusion also be designed as a cutting edge.
  • the mold 1 and 2 consists of two mold halves 1 and 2, in which one Mold cavity 3 is arranged.
  • a cylindrical insert 4 is inserted into the mold half 2.
  • the mold half 2 In the area of an end face 5 of the insert 4, the mold half 2 has a support surface 6, which is provided with a projection 7, which ends in a tip 8.
  • the mold half 1 has a support surface 9, which is intended to lie against the insert 4. Furthermore is in the mold half 1, a temperature sensor 10 is provided, which in the region of the support surface 9 on Insert 4 is present.
  • the tip 8 penetrates into the insert 4 and presses the insert 4 against the opposite support surface 9. Then the mold cavity 3 is then filled with the casting alloy.
  • a sleeve-like component for example a connecting rod, is produced, which is reinforced on its inner circumference by an insert 4.
  • Appropriate Parts are designated in FIG. 4 with the same reference symbols.
  • the mold half 2 are in At regular intervals three projections 7 are formed, which insert part 4 to an opposite one Press support surface 9 of mold half 1.
  • a precise seat of the Insert reached.
  • the depth e of the mold cavity of the mold half 2 to the support surface 6 must be greater than b, that is e> b.
  • the present invention enables high quality hybrid parts to be made with simple means to manufacture.
  • the particular advantage of the present invention is that it is not necessary is to manufacture the inserts with high precision in order to achieve the smallest possible tolerances to reach.

Description

Die Erfindung betrifft ein Verfahren und eine Formanordnung gemäß dem Ansprüchen 1 und 4 zur Herstellung von Hybridteilen, bei dem ein Einlegeteil aus Metall in eine aus mindestens zwei Formhälften bestehende Form eingelegt wird, und nach dem Schließen der Formhälften in einer genau bestimmten Stellung gehalten wird, worauf flüssiges Metall in die Form gegossen wird, und wobei die Lage des Einlegeteiles durch zwei einander gegenüberliegende Stützflächen definiert wird, die in unterschiedlichen Formhälften gebildet sind (DE-B-1110371).The invention relates to a method and a mold arrangement according to claims 1 and 4 for the production of hybrid parts, in which an insert of metal is inserted into a mold consisting of at least two mold halves, and after closing the mold halves is held in a precisely determined position, whereupon liquid metal is poured into the mold, and the position of the insert through Two opposing support surfaces are defined, which are in different mold halves are formed (DE-B-1110371).

Es ist bekannt, die mechanischen Eigenschaften von Teilen, die beispielsweise durch Druckguß hergestellt werden, dadurch zu verbessern, daß sogenannte Einlegeteile verwendet werden. Diese Einlegeteile sind häufig faserverstärkt. Dabei wird der Einlegeteil, der in einem ersten Verfahrensschritt vorgefertigt wird, in die Form eingelegt und vom eigentlichen Gußmaterial umgossen. Ein solches Verfahren erlaubt die Herstellung von Hybridteilen aus unterschiedlichen Materialien, mit jeweils optimierten und aufeinander abgestimmten Eigenschaften. So können etwa Werkstücke hergestellt werden, die aus einer Magnesiumlegierung bestehen und einen Einlegeteil aus einem anderen Werkstoff aufweisen. Daher ermöglicht es ein solches Verfahren, ein Werkstück an hochbelasteten Stellen gezielt mit einer Faserverstärkung zu versehen, während geringer belastete Teile aus Kostengründen unverstärkt ausgebildet sind.It is known the mechanical properties of parts, for example, by die casting be made to improve by using so-called inserts. These inserts are often fiber-reinforced. The insert, which is in one first process step is prefabricated, inserted into the mold and from the actual casting material cast around. Such a method allows the production of hybrid parts from different Materials, each with optimized and coordinated properties. For example, workpieces can be made from a magnesium alloy exist and have an insert made of a different material. Therefore it enables such a process, a workpiece at highly stressed areas with fiber reinforcement to be provided, while parts with lower loads are not reinforced for cost reasons are.

Die DE 39 32 562 A betrifft eine Vorrichtung zur Herstellung von Leichtmetallkolben für Verbrennungskraftmaschinen. Dabei ist ein Einlegeteil vorgesehen, der zwischen einer Formhälfte und einem Salzkern angeordnet ist. Um das Aufschwimmen des Salzkerns zu verhindern, ist dieser an der gegenüberliegenden Formhälfte mit stiftartigen Ansätzen abgestützt. Eine spielfreie Lagerung von Salzkern und Einlegeteil ist bei dieser Vorrichtung nur schwer erreichbar.DE 39 32 562 A relates to a device for producing light metal pistons for Internal combustion engines. An insert is provided between a mold half and a salt core is arranged. To prevent the salt core from floating, is supported on the opposite half of the mold with pin-like approaches. A play-free storage of salt core and insert is difficult with this device reachable.

Aus der DE 38 07 347 A ist ein Verfahren zur Herstellung von Formkörpern bekannt, die aus mehreren Metallschichten bestehen.From DE 38 07 347 A a process for the production of moldings is known which consists of consist of several metal layers.

In der DE 40 17 955 A und der DE 41 32 091 A sind ebenfalls Verfahren zur Herstellung von Gußwerkstücken aus unterschiedlichen Materialien vorbeschrieben.DE 40 17 955 A and DE 41 32 091 A also describe processes for the production of Cast workpieces made of different materials.

Weiters sind aus der EP 0 356 768 A und aus der DE 36 20 510 A Verfahren zur Herstellung von Gußteilen bekannt, die teilweise faserverstärkt sind.Furthermore, EP 0 356 768 A and DE 36 20 510 A describe processes for the production known from castings, which are partially fiber-reinforced.

Um das Werkstück reproduzierbar fertigen zu können, ist es erforderlich, den Einlegeteil spielfrei in der Form zu halten, um eine Bewegung des Einlegeteils zu verhindern. Andererseits ist es in vielen Fällen notwendig, den Einlegeteil auf eine vorbestimmte Temperatur, beispielsweise zwischen 200 und 300° C vorzuwärmen, um eine metallurgische Verbindung zwischen Einlegeteil und Gußwerkstoff zu erzielen. Durch die thermisch bedingten Änderungen der Abmessungen des Einlageteiles ist es jedoch äußerst schwierig, zu erreichen, daß der Einlegeteil sicher und spielfrei zwischen den Formhälften aufgenommen wird. Ist der Einlegeteil zu groß, dann entstehen beim Schließen der Formhälften große Kräfte, die zur Zerstörung von Bauteilen führen können. Bei einem zu kleinen Einlegeteil ist nicht gewährleistet, daß dieser die vorbestimmte Lage in der Form einnimmt.In order to be able to produce the workpiece reproducibly, it is necessary to insert the part to keep free of play in the form to prevent movement of the insert. On the other hand in many cases it is necessary to bring the insert to a predetermined temperature, For example, preheat between 200 and 300 ° C to create a metallurgical bond to achieve between insert and casting material. Due to the thermal changes the dimensions of the insert part, it is extremely difficult to achieve that the insert is securely and free of play between the mold halves. Is the Insert too large, then large forces arise when closing the mold halves Destruction of components can result. If the insert is too small, it is not guaranteed that this assumes the predetermined position in the form.

Aufgabe der vorliegenden Erfindung ist es, ein Verfahren anzugeben, bei dem eine genaue und sichere Positionierung von Einlegeteilen auch dann gewährleistet ist, wenn gewisse Toleranzen in den Abmessungen von Form oder Einlegeteil auftreten, wobei eine globale Verformung der Einlegeteile vermieden wird.The object of the present invention is to provide a method in which an accurate and secure positioning of inserts is guaranteed even if certain tolerances occur in the dimensions of the shape or insert, with a global Deformation of the inserts is avoided.

Erfindungsgemäß wird dies dadurch erreicht, daß aus einer Stützfläche mindestens ein mit einer Spitze versehener Vorsprung vorragt, und daß bei geschlossenen Formhälften der Abstand der Spitze des Vorsprunges zur gegenüberliegenden Stützfläche kleiner ist als die minimale Erstreckung des Einlegeteiles in dieser Richtung und daß der Abstand zwischen den beiden Stützflächen größer ist als die entsprechende maximale Erstreckung des Einlegeteiles in dieser Richtung wodurch der Einlegteil beim Schließen der Formhälften ausschließlich im Bereich des Eindringens des mit einer Spitze versehenen vorsprungs Lokal verformt wird. Um die Funktion des Formwerkzeuges zu erhalten, ist es klarerweise erforderlich, daß der Werkstoff der Spitze des Vorsprunges deutlich härter ist, als der des Einlegeteils.According to the invention this is achieved in that at least one with a support surface protrudes a tip provided, and that with closed mold halves, the distance the tip of the projection to the opposite support surface is smaller than the minimum Extension of the insert in this direction and that the distance between the two support surfaces is greater than the corresponding maximum extent of the insert in this direction whereby the insertion part is deformed only when the mold halves are closed in the area of penetration of the protruding locus provided with a tip. In order to maintain the function of the molding tool, it is clearly necessary that the material of the tip of the projection is significantly harder than that of the insert.

Das erfindungsgemäße Verfahren ist grundsätzlich für alle Gießverfahren geeignet, die mit zwei oder mehr Formhälften arbeiten, von denen mindestens eine beweglich ist, wie etwa den Druckguß. Besonders geeignet ist die Erfindung für die sogenannten SC (shot control) Verfahren, bei denen der Kolbenhub während des Gießvorganges gesteuert wird.The method according to the invention is fundamentally suitable for all casting methods which are associated with work two or more mold halves, at least one of which is movable, such as that Diecast. The invention is particularly suitable for the so-called SC (shot control) processes, in which the piston stroke is controlled during the casting process.

Wesentlich an der Erfindung ist, daß die Lage des Einlegeteils durch zwei einander gegenüberliegende Stützflächen definiert wird. Die Form der Stützflächen hängt grundsätzlich von der Form des zu fertigenden Werkstückes ab. Handelt es sich bei dem Einlegeteil beispielsweise um einen Ring, so sind mindestens drei Spitzen erforderlich. In den hier beschriebenen Beispielen wird von zueinander parallelen Stützflächen ausgegangen, was jedoch nicht unbedingt der Fall sein muß. Durch das erfindungsgemäße Verfahren wird erreicht, daß der Einlegeteil in einer Formhälfte sicher an einer Stützfläche anliegt, wodurch eine genau definierte Lage des Einlegeteils erreicht wird. An der anderen Stützfläche drückt sich die Spitze des Vorsprunges in den Einlegeteil ein, und zwar so weit, wie dies erforderlich ist. Die Abmessungen der einzelnen Bauteile sind dabei so gewählt, daß bei Verwendung eines Einlegeteils mit einer Abmessung an der unteren Toleranzgrenze die Spitze des Vorsprunges in den Einlegeteil eindringt, und zwar so weit, daß ein sicherer Halt gewährleistet ist. Ist die Abmessung des Einlegeteils an der oberen Toleranzgrenze, dann dringt der Vorsprung weiter ein, wobei die entsprechende Stützfläche dem Einlegeteil sehr nahe kommt, oder ihn maximal leicht berührt.It is essential to the invention that the position of the insert by two opposite one another Support surfaces is defined. The shape of the support surfaces basically depends on the shape of the workpiece to be manufactured. Is it the insert, for example around a ring, at least three tips are required. In those described here Examples are based on parallel support surfaces, but not absolutely must be the case. The inventive method ensures that the Insert in a mold half rests securely on a support surface, creating a precisely defined one Position of the insert is reached. The tip presses against the other support surface of the projection in the insert, as far as is necessary. The dimensions of the individual components are chosen so that when using an insert with a dimension at the lower tolerance limit the tip of the projection in the Insert penetrates so far that a secure hold is guaranteed. Is the Dimension of the insert at the upper tolerance limit, then the protrusion continues one, the corresponding support surface being very close to the insert, or at most lightly touched.

Ein weiterer Vorteil der Erfindung besteht darin, daß auch die Kraft definiert ist, mit der der Einlegeteil zwischen den Stützflächen eingespannt ist. Durch diese Verspannung kann nicht nur ein sicheres Anliegen etwa an einem Thermofühler erreicht werden, es kann auch eine Überlastung des Bauteils und des Formen verhindert werden.Another advantage of the invention is that the force is defined with which the Insert is clamped between the support surfaces. This tension cannot Only a safe concern can be achieved, for example, with a thermocouple, it can also be one Overloading of the component and the molding can be prevented.

In einer bevorzugten Ausführungsvariante des erfindungsgemäßen Verfahrens ist vorgesehen, daß der Einlegeteil auf eine vorbestimmte Temperatur vorgewärmt wird. Auf diese Weise kann eine metallische Verbindung der Werkstoffe erreicht werden, was die Festigkeitseigenschaften verbessert.In a preferred embodiment variant of the method according to the invention, that the insert is preheated to a predetermined temperature. In this way a metallic connection of the materials can be achieved, which improves the strength properties improved.

Um eine genaue Kontrolle über das Verfahren zu ermöglichen, kann in bevorzugter Weise vorgesehen sein, daß vor und/oder während des Gußvorganges eine Temperaturmessung an einer Fläche des Einlegeteiles durchgeführt wird.In order to allow precise control over the process, it can be done in a preferred manner be provided that a temperature measurement before and / or during the casting process an area of the insert is carried out.

Weiters betrifft die Erfindung eine Formanordnung zur Herstellung von Hybridteilen, mit mindestens zwei Formhälften, wobei in unterschiedlichen Formhälften Stützflächen zum Halten eines Einlegeteiles ausgebildet sind. Diese Formanordnung ist erfindungsgemäß dadurch gekennzeichnet, daß aus einer Stützfläche mindestens ein mit einer Spitze versehener Vorsprung vorragt, und wobei der Abstand der Spitze des Vorsprunges zur gegenüberliegenden Stützfläche kleiner ist als die minimale Erstreckung des Einlegeteiles in dieser Richtung und daß der Abstand zwischen den beiden Stützflächen größer ist als die entsprechende maximale Erstreckung des Einlegeteiles in dieser Richtung wobei die Verformung des Einlegeteiles lokal auf die Umgebung der Spitze des Vorsprungs beschränkt bleibt. In bevorzugter Weise kann die Spitze kegelförmig oder pyramidenförmig ausgebildet sein. Alternativ dazu kann der Vorsprung auch als Schneide ausgebildet sein. Bei der konstruktiven Gestaltung des Vorsprunges wird man darauf Rücksicht nehmen, daß in dem hergestellten Werkstück ein Abdruck des Vorsprunges verbleibt. In vielen Fällen wird es möglich sein, den Vorsprung so anzuordnen, daß ein solcher Abdruck am fertigen Werkstück nicht störend ist. Wenn es nicht anders möglich ist, muß eine Nachbearbeitung des Werkstückes erfolgen.The invention further relates to a mold arrangement for producing hybrid parts, with at least two mold halves, with support surfaces for different mold halves Holding an insert are formed. This shape arrangement is according to the invention characterized in that from a support surface at least one with a tip Projection protrudes, and wherein the distance of the tip of the projection to the opposite Support area is smaller than the minimum extent of the insert in this direction and that the distance between the two support surfaces is greater than the corresponding one maximum extension of the insert part in this direction, the deformation of the insert part remaining locally limited to the area around the tip of the projection. In a preferred manner, the Tip be conical or pyramid-shaped. Alternatively, the protrusion also be designed as a cutting edge. When designing the lead will be taken into account that an imprint of the Advantage remains. In many cases it will be possible to arrange the ledge so that such an imprint on the finished workpiece is not disturbing. If not otherwise possible , the workpiece must be reworked.

In der Folge wird die Erfindung anhand der in den Figuren dargestellten Ausführungsbeispiele näher erläutert.In the following, the invention is based on the exemplary embodiments shown in the figures explained in more detail.

Es zeigen schematisch:

Fig. 1
eine erfindungsgemäße Formanordnung mit einem Einlegeteil in geöffnetem Zustand,
Fig. 2
ist ein Detail von Fig. 1,
Fig. 3
die Formanordnung von Fig. 1 in geschlossenem Zustand, und
Fig. 4
ist eine weitere Ausführungsvariante der vorliegenden Erfindung.
They show schematically:
Fig. 1
a mold arrangement according to the invention with an insert in the open state,
Fig. 2
is a detail of Fig. 1,
Fig. 3
1 in the closed state, and
Fig. 4
is a further embodiment variant of the present invention.

Die Formanordnung der Fig. 1 und 2 besteht aus zwei Formhälften 1 und 2, in denen ein Formhohlraum 3 angeordnet ist. In die Formhälfte 2 ist ein zylindrischer Einlegeteil 4 eingelegt. Im Bereich einer Stirnfläche 5 des Einlegeteils 4 weist die Formhälfte 2 eine Stützfläche 6 auf, die mit einem Vorsprung 7 versehen ist, der in einer Spitze 8 endet. Die Formhälfte 1 besitzt eine Stützfläche 9, die dazu bestimmt ist, am Einlegeteil 4 anzuliegen. Weiters ist in der Formhälfte 1 ein Temperaturfühler 10 vorgesehen, der im Bereich der Stützfläche 9 am Einlegeteil 4 anliegt.1 and 2 consists of two mold halves 1 and 2, in which one Mold cavity 3 is arranged. A cylindrical insert 4 is inserted into the mold half 2. In the area of an end face 5 of the insert 4, the mold half 2 has a support surface 6, which is provided with a projection 7, which ends in a tip 8. The mold half 1 has a support surface 9, which is intended to lie against the insert 4. Furthermore is in the mold half 1, a temperature sensor 10 is provided, which in the region of the support surface 9 on Insert 4 is present.

Wenn die Formhälften 1 und 2 geschlossen werden, dann dringt die Spitze 8 in den Einlegeteil 4 ein und drückt den Einlegeteil 4 an die gegenüberliegende Stützfläche 9. Im Anschluß daran wird der Formhohlraum 3 mit der Gußlegierung gefüllt. When the mold halves 1 and 2 are closed, the tip 8 penetrates into the insert 4 and presses the insert 4 against the opposite support surface 9. Then the mold cavity 3 is then filled with the casting alloy.

Bei der Ausführungsvariante von Fig. 4 wird ein hülsenartiger Bauteil, etwa ein Pleuel hergestellt, die an ihrem inneren Umfang durch einen Einlegeteil 4 verstärkt ist. Entsprechende Teile sind in der Fig. 4 mit gleichen Bezugszeichen bezeichnet. In der Formhälfte 2 sind in regelmäßigen Anständen drei Vorsprünge 7 gebildet, die den Einlegeteil 4 an eine gegenüberliegende Stützfläche 9 der Formhälfte 1 drücken. Auch hier wird ein genauer Sitz des Einlegeteils erreicht.4, a sleeve-like component, for example a connecting rod, is produced, which is reinforced on its inner circumference by an insert 4. Appropriate Parts are designated in FIG. 4 with the same reference symbols. In the mold half 2 are in At regular intervals three projections 7 are formed, which insert part 4 to an opposite one Press support surface 9 of mold half 1. Here too, a precise seat of the Insert reached.

Bezeichnet man die Tiefe des Formenhohlraums 3 der Formhälfte 1 mit a und die Tiefe mit der der Einlegeteil 4 in die Formhälfte 2 bei geschlossener Form eindringt mit b, so daß die Länge 1 des Einlegeteils 4 die Summe aus a und b darstellt, so ergeben sich folgende Bedingungen für eine ordnungsgemäße Funktion der Erfindung. Die Tiefe e des Formhohlraums der Formhälfte 2 bis zur Stützfläche 6 muß größer sein als b, also e > b. Denoting the depth of the mold cavity 3 of the mold half 1 with a and the depth with which the insert 4 penetrates into the mold half 2 when the mold is closed with b, so that the length 1 of the insert 4 represents the sum of a and b following conditions for the proper functioning of the invention. The depth e of the mold cavity of the mold half 2 to the support surface 6 must be greater than b, that is e> b.

Dies ist die Voraussetzung dafür, daß der Einlegeteil 4 durch das Schließen der Formhälften 1, 2 nicht unzulässig gestaucht wird.This is the prerequisite for the insert 4 to be closed by closing the mold halves 1, 2 is not inadmissibly compressed.

Andererseits muß b > e - d wobei d die Höhe der Spitze 7 des Vorsprungs 7 darstellt. Die Eindringtiefe c des Vorsprungs 7 in den Einlegeteil 4 ist dabei durch folgende Gleichung gegeben: c = d - e + b. On the other hand, must b> e - d where d represents the height of the tip 7 of the projection 7. The depth of penetration c of the projection 7 into the insert 4 is given by the following equation: c = d - e + b.

Es muß somit eine minimale Eindringtiefe c gegeben sein, um den genau definierten Sitz des Einlegeteils 4 zu gewährleisten.There must therefore be a minimum depth of penetration c in order to ensure the precisely defined fit of the To ensure insert 4.

Die Länge 1 (= a + b) des Einlegeteils ist dabei die tatsächliche Länge während des Schusses. Diese tatsächliche Länge 1 unterscheidet sich von der nominellen Länge durch Herstellungstoleranzen und die Wärmeausdehnung. Es ist zwar an sich möglich, die Länge 1 zu berechnen oder durch Versuche zu bestimmen, eine Vielzahl von Einflußgrößen erschwert jedoch eine solche genaue Bestimmung, die ansonsten im zehntel Millimeterbereich erforderlich wäre.The length 1 (= a + b) of the insert is the actual length during the shot. This actual length 1 differs from the nominal length due to manufacturing tolerances and thermal expansion. It is possible in itself to calculate the length 1 or to determine by experiment, however, a large number of influencing variables complicates such an accurate determination that would otherwise be required in the tenths of a millimeter range would.

Die vorliegende Erfindung ermöglicht es, mit einfachen Mitteln Hybridteile hoher Qualität herzustellen. Der besondere Vorteil der vorliegenden Erfindung liegt darin, daß es nicht notwendig ist, die Einlegeteile hochgenau zu fertigen, um geringstmögliche Toleranzen zu erreichen.The present invention enables high quality hybrid parts to be made with simple means to manufacture. The particular advantage of the present invention is that it is not necessary is to manufacture the inserts with high precision in order to achieve the smallest possible tolerances to reach.

Claims (7)

  1. A method to produce hybrid parts in which an insert (4) made of metal is inserted into a mould consisting of at least two mould halves (1, 2) and is held following the closure of the mould halves (1, 2) in a precisely defined position, whereupon liquid metal is poured into the mould, with the position of the insert (4) being defined by two mutually opposite supporting areas (6,9) which are formed in different mould halves (1, 2), with at least one projection (7) provided with a tip protruding from one supporting area (6) and with the distance of the tip (8) of the projection to the opposite supporting area (9) being smaller when the mould halves are closed than the minimum extension of the insert (4) in this direction and the distance between the two supporting areas (6, 9) being higher than the respective maximum extension of the insert (4) in this direction, as a result of which the insert is deformed locally only in the zone of the penetration of the projection (7) provided with the tip during the closure of the mould halves (1, 2).
  2. A method as claimed in claim 1, characterized in that the insert (4) is preheated to a predetermined temperature prior to the insertion.
  3. A method as claimed in one of the claims 1 or 2, characterized in that a temperature measurement is performed on a surface area (9) of the insert prior to and/or during the casting process.
  4. A mould arrangement to produce hybrid parts, with at least two mould halves (1, 2), with supporting areas (6, 9) for holding an insert being arranged in different mould halves, with at least one projection (7) provided with a tip protruding from a supporting area (6) and with the distance of the tip (8) of the projection (7) to the opposite supporting surface (9) being smaller than the minimum extension of the insert (4) in this direction and with the distance between the two supporting areas (6, 9) being larger than the respective maximum extension of the insert (4) in this direction, with the deformation of the insert (4) being locally limited to the ambient area of the tip (8) of the projection (7).
  5. A mould arrangement as claimed in claim 4, characterized in that the projection (7) is provided with a conical or pyramidal arrangement.
  6. A mould arrangement as claimed in claim 4, characterized in that the projection is arranged as a cutting edge.
  7. A mould arrangement as claimed in one of the claims 4 to 6, characterized in that a temperature sensor (10) is arranged in the zone of the supporting area (9) which is disposed opposite of the supporting area (6) with the projection (7).
EP19980890059 1997-03-05 1998-03-05 Process and apparatus for making composite cast pieces Expired - Lifetime EP0867247B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT378/97 1997-03-05
AT37897A AT405622B (en) 1997-03-05 1997-03-05 METHOD FOR PRODUCING HYBRID PARTS
AT37897 1997-03-05

Publications (2)

Publication Number Publication Date
EP0867247A1 EP0867247A1 (en) 1998-09-30
EP0867247B1 true EP0867247B1 (en) 2000-05-10

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Application Number Title Priority Date Filing Date
EP19980890059 Expired - Lifetime EP0867247B1 (en) 1997-03-05 1998-03-05 Process and apparatus for making composite cast pieces

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EP (1) EP0867247B1 (en)
AT (1) AT405622B (en)
DE (1) DE59800144D1 (en)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1110371B (en) * 1958-03-03 1961-07-06 Licentia Gmbh Process for the production of a valve plate for motor compressors by injection molding
US3314118A (en) * 1964-11-10 1967-04-18 Stanworth George Moulding techniques
FR2216039B1 (en) * 1973-02-07 1975-03-07 Broux Roland
JPS61293649A (en) * 1985-06-20 1986-12-24 Akebono Brake Res & Dev Center Ltd Casting method for fiber-reinforced caliper
JPS62161456A (en) * 1986-01-10 1987-07-17 Yamaha Motor Co Ltd Device for preventing movement of insert of die for molding
DE3807347A1 (en) * 1988-03-05 1989-09-14 Werner Schatz Shaped body consisting of a plurality of metal layers and method for its production
EP0356768B1 (en) * 1988-09-02 1993-04-28 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Light metal castings piece, especially die casting piece
DE4017955A1 (en) * 1989-06-07 1990-12-13 Zahnradfabrik Friedrichshafen Actuating fork for change speed gearbox - is made from aluminium casting with cast-in brass shoes
DE3932562A1 (en) * 1989-09-29 1991-04-11 Kolbenschmidt Ag DEVICE FOR PRODUCING LIGHT METAL PISTON FOR INTERNAL COMBUSTION ENGINES
DE4132091A1 (en) * 1990-09-22 1992-04-30 Hoessle Sibylle Iron@-magnesium@ composite casting - useful as sacrificial anode
JPH0557417A (en) * 1991-08-30 1993-03-09 Toyoda Gosei Co Ltd Method for casting metal
JPH06238395A (en) * 1992-11-13 1994-08-30 Ryobi Ltd Device for holding sand core

Also Published As

Publication number Publication date
ATA37897A (en) 1999-02-15
DE59800144D1 (en) 2000-06-15
EP0867247A1 (en) 1998-09-30
AT405622B (en) 1999-10-25

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