EP1050358A1 - Moulding method using a precursor - Google Patents

Moulding method using a precursor Download PDF

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Publication number
EP1050358A1
EP1050358A1 EP00105510A EP00105510A EP1050358A1 EP 1050358 A1 EP1050358 A1 EP 1050358A1 EP 00105510 A EP00105510 A EP 00105510A EP 00105510 A EP00105510 A EP 00105510A EP 1050358 A1 EP1050358 A1 EP 1050358A1
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EP
European Patent Office
Prior art keywords
casting
mold surface
precursor body
precursor
additional
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP00105510A
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German (de)
French (fr)
Inventor
Otto Dr.-Ing. Stenzel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KS Huayu Alutech GmbH
Original Assignee
KS Aluminium Technologie GmbH
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 KS Aluminium Technologie GmbH filed Critical KS Aluminium Technologie GmbH
Publication of EP1050358A1 publication Critical patent/EP1050358A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B22D19/14—Casting in, on, or around objects which form part of the product the objects being filamentary or particulate in form
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C22C1/1057—Reactive infiltration

Definitions

  • the invention relates to a method for producing a Alloy casting in one die casting processes, e.g. on Die casting or medium pressure casting process or a squeeze casting process, using one or more reaction-infiltrable precursor body.
  • a casting process in which the melt during solidification under a pressure of more than 10 bar stands.
  • metal-ceramic composites in which a light metal alloy, for example an aluminum melt, is pressed into a porous precursor body during the casting process.
  • the melt reacts with the substances of the precursor body, which are mostly metal oxides.
  • the metal oxides are reduced by the metal of the melt.
  • aluminum oxide (Al 2 O 3 ) forms, and the metal forms an alloy or an intermetallic phase, for example an aluminide, with the light metal of the remaining infiltrated melt.
  • Al 2 O 3 aluminum oxide
  • the metal forms an alloy or an intermetallic phase, for example an aluminide
  • the one for pressurized Casting process used metallic permanent molds, e.g. made of steel or copper, with regard to the Reaction of the infiltrable precursor body needed Time is an undesirable heat sink.
  • metallic permanent molds e.g. made of steel or copper
  • the temperature of the Melt due to the outflow of heat to the Mold surface very quickly lowered, so that none sufficient time for the complete chemical reaction of the precursor substances with the light metal melt Available.
  • the present invention is the Task based on the casting process of the aforementioned Kind of improve that one in terms of the precursor reaction to rapid cooling of the Light metal melt does not take place, i.e. that one too rapid cooling is counteracted.
  • This task is carried out in a method of the type mentioned solved according to the invention in that in front of a respective Casting process between the precursor body and one A heat insulation is provided on the mold surface.
  • the thermal insulation means the invention in the form of a regionally coating the Mold surface are introduced.
  • the area by area In such a case, the coating must be opposite the material the mold preferably much worse Have thermal conductivity.
  • Resin or water glass bonded sand materials such as they are used, for example, when using sand cores become. This can infiltrate sand core materials or non-infiltrable, die-cast resistant Sand core materials are used. The latter have that Advantage that they can be easily removed by shaking can.
  • the Thermal insulation from an additional precursor body are formed, its exothermic reduction reaction lower temperature is exothermic, and the this gives rise to heat of reaction released into the melt partial heat flow to the mold surface compensated.
  • an additional precursor body might be from an infiltrable quartz sand core be formed, partially with the Light metal melt reacts and additional heat generated.
  • the resulting composite is very good hard and therefore difficult to remove. In this respect, would only superficial infiltration is advantageous prove, especially since the rest of the case does not infiltrated core area more effective heat dissipation could delay.
  • the additional advantageously comprises Precursor body metal oxides, such as copper oxide, lead oxide or Iron oxide. That is in this additional precursor area forming structure can (and should) be low Have strength properties.
  • Precursor body metal oxides such as copper oxide, lead oxide or Iron oxide. That is in this additional precursor area forming structure can (and should) be low Have strength properties.
  • the exothermic Reaction can be caused by additional other oxygen donations Agents (e.g. nitrates) like those used in the explosives industry be used, supported or initiated.
  • the reinforcing precursor body can, for example, in the form a reinforcement part in the area of the storage chair for one Crankshaft or serve.
  • the precursor body at the required Disruption of the casting is proposed To arrange the precursor body in or on the mold, that it can be removed from the casting afterwards. This means that it is outside the target contour of the to produce the casting, so to speak in the wall of the mold to be reset for this purpose is used.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mold Materials And Core Materials (AREA)

Abstract

The casting process, using light metal alloys, uses one or more precursor bodies which can have a reaction infiltration. A h damping material is inserted between the precursor body and the mold surface before casting, to give an effective reaction betwe the precursor material and the molten light metal. The heat damper is a local coating of the mold surface with bonded sand.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen eines Gußstücks aus Leichtmetalllegierung in einem druckgussbeaufschlagten Giessverfahren, wie z.B. ein Druckguss- oder Mitteldruckgussverfahren oder ein Squeeze-Casting-Verfahren, unter Einsatz eines oder mehrerer reaktionsinfiltrierbarer Precursorkörper. In jedem Fall handelt es sich um ein Giessverfahren, bei dem die Schmelze während der Erstarrung unter einem Druck von mehr als 10 bar steht. The invention relates to a method for producing a Alloy casting in one die casting processes, e.g. on Die casting or medium pressure casting process or a squeeze casting process, using one or more reaction-infiltrable precursor body. In any case is a casting process in which the melt during solidification under a pressure of more than 10 bar stands.

Es ist bekannt, auf diese Weise Metallkeramik-Verbundwerkstoffe herzustellen, bei denen eine Leichtmetalllegierung, beispielsweise eine Aluminiumschmelze, in einen porösen Precursorköper während des Giessvorgangs hineingedrückt wird. Die Schmelze reagiert mit den Stoffen des Precursorkörpers, bei denen es sich zumeist um Metalloxide handelt. Die Metalloxide werden durch das Metall der Schmelze reduziert. Es bildet sich beispielsweise Aluminiumoxid (Al2O3), und das Metall bildet mit dem Leichtmetall der restlichen infiltrierten Schmelze eine Legierung oder eine intermetallische Phase, also beispielsweise ein Aluminid. Es findet also eine chemische Reaktion zwischen den Bestandteilen des porösen infiltrierbaren Precursorkörpers und der Leichtmetallschmelze statt, und es wird auf diese Weise ein metallkeramischer Verbundwerkstoff hergestellt.It is known in this way to produce metal-ceramic composites in which a light metal alloy, for example an aluminum melt, is pressed into a porous precursor body during the casting process. The melt reacts with the substances of the precursor body, which are mostly metal oxides. The metal oxides are reduced by the metal of the melt. For example, aluminum oxide (Al 2 O 3 ) forms, and the metal forms an alloy or an intermetallic phase, for example an aluminide, with the light metal of the remaining infiltrated melt. There is therefore a chemical reaction between the constituents of the porous infiltrable precursor body and the light metal melt, and a metal-ceramic composite material is produced in this way.

Für die vorstehend erwähnte chemische Reaktion wird eine hinreichende Temperatur, und zwar über eine hinreichend lange Zeit, benötigt. Die für druckbeaufschlagte Giessverfahren verwendeten metallischen Dauergiessformen, z.B. aus Stahl oder Kupfer, stellen im Hinblick auf die zur Reaktion des infiltrierbaren Precursorkörpers benötigte Zeit eine unerwünschte Wärmesenke dar. Insbesondere im Bereich dünnwandiger Gußstücke und in Bereichen, wo der infiltrierbare Precursor recht nahe an eine Giessformoberfläche angrenzt, wird die Temperatur der Schmelze infolge des Wärmeabflusses zu der Giessformoberfläche sehr rasch erniedrigt, so dass keine hinreichende Zeit für die vollständige chemische Reaktion der Precursorstoffe mit der Leichtmetallschmelze zur Verfügung steht.For the chemical reaction mentioned above, a sufficient temperature, and above a sufficient long time, needed. The one for pressurized Casting process used metallic permanent molds, e.g. made of steel or copper, with regard to the Reaction of the infiltrable precursor body needed Time is an undesirable heat sink. Especially in the Area of thin-walled castings and in areas where the infiltrable precursor quite close to one Mold surface adjacent, the temperature of the Melt due to the outflow of heat to the Mold surface very quickly lowered, so that none sufficient time for the complete chemical reaction of the precursor substances with the light metal melt Available.

Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, das Giessverfahren der eingangs genannten Art dahingehend zu verbessern, dass eine im Hinblick auf die Precursorreaktion zu rasche Abkühlung der Leichtmetallschmelze nicht stattfindet, d.h. dass einer zu raschen Abkühlung entgegengewirkt wird.Proceeding from this, the present invention is the Task based on the casting process of the aforementioned Kind of improve that one in terms of the precursor reaction to rapid cooling of the Light metal melt does not take place, i.e. that one too rapid cooling is counteracted.

Diese Aufgabe wird bei einem Verfahren der genannten Art erfindungsgemäss dadurch gelöst, dass vor einem jeweiligen Giessvorgang zwischen dem Precursorkörper und einer Giessformoberfläche ein Wärmedämmmittel vorgesehen wird.This task is carried out in a method of the type mentioned solved according to the invention in that in front of a respective Casting process between the precursor body and one A heat insulation is provided on the mold surface.

Das Wärmedämmmittel kann nach einer ersten Ausführungsform der Erfindung in Form einer bereichsweisen Beschichtung der Giessformoberfläche eingebracht werden. Die bereichsweise Beschichtung muss solchenfalls eine gegenüber dem Material der Giessform vorzugsweise sehr viel schlechtere Wärmeleitfähigkeit aufweisen. In Frage kommen in vorteilhafter Weiterbildung dieses Erfindungsgedankens kunstharz- oder wasserglasgebundene Sandmaterialien, wie sie beispielsweise beim Einsatz von Sandkernen verwendet werden. Hierbei können infiltrierbare Sandkernmaterialien oder nicht infiltrierbare, druckgussfeste Sandkernmaterialien verwendet werden. Letztere haben den Vorteil, dass sie durch Rütteln einfach entfernt werden können.According to a first embodiment, the thermal insulation means the invention in the form of a regionally coating the Mold surface are introduced. The area by area In such a case, the coating must be opposite the material the mold preferably much worse Have thermal conductivity. Come into question advantageous development of this inventive concept Resin or water glass bonded sand materials, such as they are used, for example, when using sand cores become. This can infiltrate sand core materials or non-infiltrable, die-cast resistant Sand core materials are used. The latter have that Advantage that they can be easily removed by shaking can.

Nach einer weiteren Ausführungsform der Erfindung kann das Wärmedämmmittel von einem zusätzlichen Precursorkörper gebildet werden, dessen exotherme Reduktionsreaktion bei niedrigerer Temperatur exotherm abläuft, und wobei die dabei entstehende in die Schmelze abgegebene Reaktionswärme den Wärmeabfluss zu der Giessformoberfläche teilweise kompensiert. Ein solcher zusätzlicher Precursorkörper könnte beispielsweise von einem infiltrierbaren QuarzSandkern gebildet sein, der partiell mit der Leichtmetallschmelze reagiert und dabei zusätzliche Wärme erzeugt. Der hierbei entstehende Verbundwerkstoff ist sehr hart und daher schwer zu entfernen. Insofern würde sich eine nur oberflächliche Infiltration als vorteilhaft erweisen, zumal solchenfalls der restliche nicht infiltrierte Kernbereich die Wärmeableitung wirksamer verzögern könnte. According to a further embodiment of the invention, the Thermal insulation from an additional precursor body are formed, its exothermic reduction reaction lower temperature is exothermic, and the this gives rise to heat of reaction released into the melt partial heat flow to the mold surface compensated. Such an additional precursor body might be from an infiltrable quartz sand core be formed, partially with the Light metal melt reacts and additional heat generated. The resulting composite is very good hard and therefore difficult to remove. In this respect, would only superficial infiltration is advantageous prove, especially since the rest of the case does not infiltrated core area more effective heat dissipation could delay.

In vorteilhafter Weise umfasst der zusätzliche Precursorkörper Metalloxide, wie Kupferoxid, Bleioxid oder Eisenoxid. Das sich in diesem zusätzlichen Precursorbereich bildende Gefüge kann (und sollte) niedriege Festigkeitseigenschaftne aufweisen. Durch die bei Infiltration mit der Leichtmetallschmelze entstehenden exothermen Reaktionen wird Wärme erzeugt, die der Wärmeableitung des an kritischer Stelle zur Verstärkung eingesetzten Precursorkörpers entgegenwirkt. Die exotherme Reaktion kann durch zusätzliche andere sauerstoffspendende Mittel (z.B. Nitrate) wie sie in der Sprengstoffindustrie eingesetzt werden, unterstützt bzw. initiiert werden. Der verstärkende Precursorkörper kann beispielsweise in Form eines Verstärkungsteil im Bereich des Lagerstuhls für eine Kurbelwelle oder dienen.The additional advantageously comprises Precursor body metal oxides, such as copper oxide, lead oxide or Iron oxide. That is in this additional precursor area forming structure can (and should) be low Have strength properties. By the at Infiltration with the light metal melt exothermic reactions generate heat that the Heat dissipation at the critical point for reinforcement counteracts used precursor body. The exothermic Reaction can be caused by additional other oxygen donations Agents (e.g. nitrates) like those used in the explosives industry be used, supported or initiated. The reinforcing precursor body can, for example, in the form a reinforcement part in the area of the storage chair for one Crankshaft or serve.

Wenn der zusätzliche Precursorkörper an der erforderlichen Stelle des Gußstücks stört, wird vorgeschlagen, den Precursorkörper so in oder an der Giessform anzuordnen, dass er nachträglich vom Gußstück entfernt werden kann. Dies bedeutet, dass er ausserhalb der Zielkontur des herzustellenden Gußstücks, also quasi in die Wand der zu diesem Zweck zurückzusetzenden Giessform, eingesetzt wird.If the additional precursor body at the required Disruption of the casting is proposed To arrange the precursor body in or on the mold, that it can be removed from the casting afterwards. This means that it is outside the target contour of the to produce the casting, so to speak in the wall of the mold to be reset for this purpose is used.

Um den Einlegevorgang der Eingussstücke in die Gießform vor der Infiltration zu vereinfachen, wird vorgeschlagen, den eigentlichen verstärkenden Precursor und die wärmedämmende Isolation oder den wärmeabgebenden Reaktionskörper vorher zu verbinden, z.B. durch Kleben oder Verklammern. Eine integrierte Herstellung von beiden Vorkörpern in einem Arbeitsgang könnte unter Kostengesichtspunkten sinnvoll erscheinen.The process of inserting the castings into the mold To simplify infiltration, it is proposed that actual reinforcing precursor and the heat insulating Isolation or the heat emitting reaction body beforehand to connect, e.g. by gluing or clipping. A integrated production of both preforms in one Operation could make sense from a cost perspective appear.

Claims (7)

Verfahren zum Herstellen eines Gußstücks aus Leichtmetalllegierung in einem druckbeaufschlagten Giessverfahren, wie z.B. Druckguss- oder Mitteldruckgussverfahren oder Squeeze-Casting-Verfahren, unter Einsatz eines oder mehrerer reaktionsinfiltrierbarer Precursorkörper,
dadurch gekennzeichnet,
dass vor einem jeweiligen Giessvorgang zwischen dem Precursorkärper und einer Giessformoberfläche ein Wärmedämmmittel vorgesehen wird.Process for producing a casting from light metal alloy in a pressurized casting process, such as die casting or medium pressure casting or squeeze casting, using one or more reaction-infiltrable precursor bodies,
characterized by
that a thermal insulation is provided before a respective casting process between the precursor body and a casting mold surface. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Wärmedämmmittel in Form einer bereichsweisen Beschichtung der Giessformoberfläche eingebracht wird.A method according to claim 1, characterized in that the heat insulation is introduced in the form of a region-by-layer coating of the mold surface. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass das Wärmedämmmittel, insbesondere als bereichsweise Beschichtung der Giessformoberfläche, aus gebundenem Sand gebildet wird.A method according to claim 1 or 2, characterized in that the heat insulation is formed from bonded sand, in particular as a partial coating of the mold surface. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass das Wärmdämmmittel von einem zusätzlichen Precursorkörper gebildet wird, dessen Reduktionsreaktion exotherm abläuft, und die dabei entstehende in die Schmelze abgegebene Reaktionswärme den Wärmeabfluss zu der Giessformoberfläche teilweise kompensiert.The method of claim 1, 2 or 3, characterized in that the Wärmdämmmittel is formed by an additional Precursorkörper, the reduction reaction proceeds exothermically, and the resulting output in the melt reaction heat partially compensates for the heat loss to the mold surface. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass der zusätzliche Precursorkörper Kupferoxid, Bleioxid oder Eisenoxid umfasst.A method according to claim 4, characterized in that the additional precursor body comprises copper oxide, lead oxide or iron oxide. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass der zusätzliche Precursorkörper so in oder an der Giessform angeordnet wird, dass er nachträglich vom Gußstück entfernt werden kann.Method according to claim 4 or 5, characterized in that the additional precursor body is arranged in or on the casting mold in such a way that it can be removed from the casting subsequently. Verfahren nach Anspruch 4, 5 oder 6, dadurch gekennzeichnet, dass der zusätzliche Precursorkörper sauerstoffabspaltende Stoffe enthältA method according to claim 4, 5 or 6, characterized in that the additional precursor body contains oxygen-releasing substances
EP00105510A 1999-05-06 2000-03-15 Moulding method using a precursor Withdrawn EP1050358A1 (en)

Applications Claiming Priority (2)

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DE19920802A DE19920802A1 (en) 1999-05-06 1999-05-06 Casting process using a precursor body
DE19920802 1999-05-06

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2823916A1 (en) * 2013-07-10 2015-01-14 Georg Fischer GmbH Composite casting
US10105755B2 (en) 2014-07-14 2018-10-23 Gf Casting Solutions Mettmann Gmbh Composite casting part

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Publication number Priority date Publication date Assignee Title
CN107971454B (en) * 2017-12-14 2019-12-06 沈阳铸造研究所有限公司 anti-permeation coating for large complex aluminum alloy casting

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2823916A1 (en) * 2013-07-10 2015-01-14 Georg Fischer GmbH Composite casting
US10105755B2 (en) 2014-07-14 2018-10-23 Gf Casting Solutions Mettmann Gmbh Composite casting part

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