EP0754514A1 - Foundry mould and process for making such a mould - Google Patents

Foundry mould and process for making such a mould Download PDF

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Publication number
EP0754514A1
EP0754514A1 EP96401620A EP96401620A EP0754514A1 EP 0754514 A1 EP0754514 A1 EP 0754514A1 EP 96401620 A EP96401620 A EP 96401620A EP 96401620 A EP96401620 A EP 96401620A EP 0754514 A1 EP0754514 A1 EP 0754514A1
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EP
European Patent Office
Prior art keywords
substrate
texture
foundry mold
mold according
foundry
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EP96401620A
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German (de)
French (fr)
Inventor
Jean-Christophe Nicol
Michel Frainais
Rolf-Jürgen Ahlers
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Filing date
Publication date
Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0754514A1 publication Critical patent/EP0754514A1/en
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a foundry mold comprising a substrate, the internal surface of which is coated with a permanent protective layer of refractory material inert with respect to the cast metal, in particular aluminum or an aluminum-based alloy. .
  • It also relates to a process for producing such a foundry mold.
  • Shell molding (that is to say by means of a metal mold) constitutes a proven and technologically advanced process, in particular for the molding of aluminum-silicon alloys.
  • said walls are coated with a layer of refractory material .
  • This coating combines binders and various mineral fillers, more or less conductive and inert with respect to the cast metal.
  • Patent FR-A-1 257 063 for example describes a coating for foundry molds prepared on a model plate in the form of a detachable crust, said coating being formed of one or more layers, which may be successively an oxide, a cermet , a metal or an alloy. The crust is then transported in the mold where it is fixed thanks to an intermediate layer. The thickness of said crust may not be less than 1 mm.
  • This coating is currently produced by “poteyage”, that is to say by depositing (with a brush or using a spray gun) a suspension or solution, the mold thus coated then being baked at around 300 ° C. to remove the solvents.
  • This refractory layer ideally has a rough texture, is brittle and fulfills several functions.
  • this refractory coating protects the mold and thus prevents its premature destruction.
  • this coating constitutes an interface between the mold and the liquid alloy, which minimizes the interactions.
  • such a coating ensures certain heat exchanges and participates in the control of directed solidification.
  • the poteyage technique is therefore expensive. It requires in particular the regular immobilization and disassembly of the molds.
  • the coating therefore has a significant impact on the cost price of the parts.
  • a foundry mold is subjected to large thermal differences. Before the casting operation, it is heated by burners so as to be maintained at a temperature of the order of 350 ° C. Then, the alloy is poured into it at a temperature which is of the order of 680 ° C. in the case of aluminum alloys.
  • the temperatures of the mold walls therefore vary between 350 ° C. and 680 ° C. each time a part is cast, the rates of casting being able to reach the rhythm of a casting every five minutes.
  • EP-A-0 543 444 has also proposed a foundry mold, the surface of which is provided with indentations and on which the protective coating consisting of a material resistant to corrosion and erosion is deposited. , such as titanium nitride, titanium carbide, silicon carbide and aluminum oxide.
  • the coating is deposited in a thin layer.
  • the imprints present on the substrate are parallel lines or cavities forming a regular pattern: it is not a question of "roughness" within the meaning of the present application which designates an irregular surface (for example that of a conventional coating. ).
  • An object of the invention is to provide a foundry mold which has a permanent refractory coating, that is to say one whose lifetime is increased substantially compared to that of the coatings obtained by coating.
  • the foundry mold is characterized in that the internal surface of the substrate has a rough texture and the protective layer is a thin layer matching the rough texture of the internal surface of the substrate.
  • the foundry mold and the method of producing this mold according to the invention avoids this difficulty.
  • foundry mold a mold-forming substrate on which a protective coating is deposited.
  • the texture of the internal surface of the substrate reproduces that of a conventional coating.
  • the texture of a classic poteyage is not constant and changes slightly as the casts are poured.
  • the texture corresponds to the texture obtained after a few flows.
  • the mold according to the invention is particularly suitable for the casting of aluminum or aluminum-based alloy parts.
  • the nature of the material that can be deposited is very broad: metallic, ceramic type carbides, nitrides, borides, stoichiometric composition or not.
  • TiCNO titanium oxycarbonitride
  • thin layer a layer whose thickness commonly varies between 20 and 300 ⁇ m. However, this thin layer can have a much smaller thickness of between 2 and 20 ⁇ m, preferably 2 to 6 ⁇ m.
  • part of a metallic substrate 2 is subjected to removal of material by the use known per se of a laser beam 4 so as to obtain a roughness 3 corresponding to that of a coating obtained by conventional coating.
  • the prior memorization of the desired texture by laser reading and image analysis allows milling to be controlled by means of a computer in order to faithfully reproduce the structure.
  • the structure produced can also be the result of a digital creation of a rough texture ensuring the same functionality on the surface. This type of milling is essential because of the fineness of the structures observed or their complexity.
  • This first step is followed by the deposition under vacuum (FIG. 2) of a thin layer 5 of refractory material of the chemical or physical vapor deposition type known per se.
  • the bond with the substrate is excellent because it is both mechanical (attachment) and physicochemical (thanks to diffusion phenomena).
  • the invention is more particularly described for the foundry of aluminum alloys in shell by gravity. It is of course generally applicable to any shell molding, without restriction as regards the cast alloy, and in particular to high pressure or low pressure shell molding.
  • An advantageous application of the invention is the manufacture of parts for motor vehicles, and in particular the manufacture of engine parts treated according to the process which is the subject of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

A foundry mould is claimed comprising a substrate (2) of which the inner surface is coated with a permanent protective layer (5) of refractory material inert w.r.t. the metal to be cast. The inner surface of the substrate has a rough texture (3) and the protective layer is a thin coating taking up the rough texture of the inner surface of the substrate. The method used to produce this foundry mould is also claimed and consists of the following steps: (a) prepn. of the inner surface of the substrate in such a manner so as to give it the appropriate roughness; and (b) depositing a thin layer of refractory material on the prepd. surface and recovering the mould.

Description

La présente invention est relative à un moule de fonderie comprenant un substrat dont la surface interne est revêtue d'une couche protectrice permanente en matériau réfractaire inerte vis-à-vis du métal coulé, notamment l'aluminium ou un alliage à base d'aluminium.The present invention relates to a foundry mold comprising a substrate, the internal surface of which is coated with a permanent protective layer of refractory material inert with respect to the cast metal, in particular aluminum or an aluminum-based alloy. .

Elle concerne également un procédé de réalisation d'un tel moule de fonderie.It also relates to a process for producing such a foundry mold.

Le moulage en coquille (c'est-à-dire au moyen d'un moule métallique) constitue un procédé éprouvé et au point sur le plan technologique, notamment pour le moulage d'alliages d'aluminium-silicium.Shell molding (that is to say by means of a metal mold) constitutes a proven and technologically advanced process, in particular for the molding of aluminum-silicon alloys.

Classiquement, pour protéger les parois du moule des interactions entre, d'une part, l'alliage liquide et, d'autre part, l'acier ou la fonte qui constituent le moule, on revêt lesdites parois d'une couche de matériau réfractaire. Ce revêtement associe des liants et diverses charges minérales, plus ou moins conductrices et inertes vis-à-vis du métal coulé.Conventionally, to protect the walls of the mold from the interactions between, on the one hand, the liquid alloy and, on the other hand, the steel or the cast iron which constitute the mold, said walls are coated with a layer of refractory material . This coating combines binders and various mineral fillers, more or less conductive and inert with respect to the cast metal.

Le brevet FR-A-1 257 063 par exemple décrit un revêtement pour moules de fonderie préparé sur une plaque modèle sous forme d'une croûte détachable, ledit revêtement étant formé d'une ou plusieurs couches, pouvant être successivement un oxyde, un cermet, un métal ou un alliage. La croûte est ensuite transportée dans le moule où on la fixe grâce à une couche intermédiaire. L'épaisseur de ladite croûte ne peut être inférieure à 1 mm.Patent FR-A-1 257 063 for example describes a coating for foundry molds prepared on a model plate in the form of a detachable crust, said coating being formed of one or more layers, which may be successively an oxide, a cermet , a metal or an alloy. The crust is then transported in the mold where it is fixed thanks to an intermediate layer. The thickness of said crust may not be less than 1 mm.

Ce revêtement est actuellement réalisé par "poteyage", c'est-à-dire par dépôt (au pinceau ou en utilisant un pistolet de projection) d'une suspension ou solution, le moule ainsi revêtu étant ensuite étuvé aux alentours de 300°C pour évacuer les solvants.This coating is currently produced by "poteyage", that is to say by depositing (with a brush or using a spray gun) a suspension or solution, the mold thus coated then being baked at around 300 ° C. to remove the solvents.

Cette couche réfractaire présente idéalement une texture rugueuse, est friable et répond à plusieurs fonctions.This refractory layer ideally has a rough texture, is brittle and fulfills several functions.

Elle permet d'éviter l'étamage, c'est-à-dire le collage de l'alliage liquide sur les parois du moule. Elle assure la lubrification du moule.It avoids tinning, that is to say the sticking of the liquid alloy on the walls of the mold. It provides lubrication of the mold.

En outre, de par sa "friabilité", elle facilite le démoulage : quelques grains à la surface du moule de fonderie sont arrachés à chaque extraction de pièce coulée, sans pour autant altérer notablement cette surface.In addition, due to its "friability", it facilitates demoulding: a few grains on the surface of the foundry mold are torn off at each extraction of the casting, without however significantly altering this surface.

Egalement, ce revêtement réfractaire protège le moule et évite ainsi sa destruction prématurée.Also, this refractory coating protects the mold and thus prevents its premature destruction.

En particulier, ce revêtement constitue une interface entre le moule et l'alliage liquide, qui minimise les interactions.In particular, this coating constitutes an interface between the mold and the liquid alloy, which minimizes the interactions.

Il constitue également une barrière thermique qui abaisse la température maximale atteinte à la surface de la coquille et prolonge ainsi la durée de vie du moule.It also constitutes a thermal barrier which lowers the maximum temperature reached on the surface of the shell and thus prolongs the life of the mold.

En outre, un tel revêtement assure certains échanges thermiques et participe à la maîtrise de la solidification dirigée.In addition, such a coating ensures certain heat exchanges and participates in the control of directed solidification.

Cependant, la faible résistance mécanique du dépôt réalisé par poteyage entraîne une destruction progressive du revêtement lors des cycles de fabrication des pièces de fonderie. Cela amène à retoucher localement ce revêtement en cours de production et à régulièrement nettoyer complètement l'outil par grenaillage pour refaire alors l'opération dite de poteyage.However, the low mechanical strength of the deposit produced by coating results in a progressive destruction of the coating during the manufacturing cycles of the foundry parts. This leads to locally touching up this coating during production and to regularly completely cleaning the tool by shot blasting to then redo the so-called poteyage operation.

La technique de poteyage est de ce fait coûteuse. Elle nécessite en particulier l'immobilisation et le démontage réguliers des moules. Le poteyage a donc une incidence non négligeable sur le prix de revient des pièces.The poteyage technique is therefore expensive. It requires in particular the regular immobilization and disassembly of the molds. The coating therefore has a significant impact on the cost price of the parts.

Afin de pallier les inconvénients précédemment discutés, on a déjà proposé de remplacer les revêtements classiquement réalisés par poteyage par d'autres revêtements de protection. On pourra avantageusement se référer à cet égard à la demande de brevet EP-252 862 qui met en oeuvre des couches de protection à base de Y2O3.In order to overcome the drawbacks previously discussed, it has already been proposed to replace the coatings conventionally produced by coating with other protective coatings. Advantageously, reference may be made in this regard to patent application EP-252 862 which uses protective layers based on Y 2 O 3 .

Ces couches de protection sont déposées directement sur l'acier du moule et s'avèrent d'une tenue dans le temps peu satisfaisante. Elles se détériorent rapidement du fait de la différence importante entre leur coefficient de dilatation thermique et celui du substrat sur lequel elles sont déposées.These protective layers are deposited directly on the steel of the mold and prove to be unsatisfactory over time. They deteriorate rapidly due to the significant difference between their coefficient of thermal expansion and that of the substrate on which they are deposited.

Lors d'un cycle de moulage, en effet, un moule de fonderie est soumis à de forts écarts thermiques. Avant l'opération de coulée, il est chauffé par des brûleurs de façon à être maintenu à une température de l'ordre de 350°C. Puis, l'alliage y est coulé à une température qui est de l'ordre de 680°C dans le cas des alliages d'aluminium. Les températures des parois du moule varient donc entre 350°C et 680°C à chaque fois qu'une pièce est coulée, les cadences de coulée pouvant atteindre le rythme d'une coulée toutes les cinq minutes. Ces écarts thermiques entre le substrat et son revêtement induisent des différences de dilatation qui par leur répétition détruisent ledit revêtement.During a molding cycle, in fact, a foundry mold is subjected to large thermal differences. Before the casting operation, it is heated by burners so as to be maintained at a temperature of the order of 350 ° C. Then, the alloy is poured into it at a temperature which is of the order of 680 ° C. in the case of aluminum alloys. The temperatures of the mold walls therefore vary between 350 ° C. and 680 ° C. each time a part is cast, the rates of casting being able to reach the rhythm of a casting every five minutes. These thermal differences between the substrate and its coating induce differences in expansion which by their repetition destroy said coating.

Diverses améliorations ont également été proposées :Various improvements have also been proposed:

Le document FR-A-2 721 240, non publié à la date de dépôt de priorité de la présente demande, décrit un revêtement déposé directement sur la paroi d'un moule de fonderie, ladite paroi étant rugueuse. Cependant, on constate à la lecture de la figure 2 que la rugosité du revêtement (qui est de l'ordre de 8 micromètres) est très différente de celle du substrat qui est de l'ordre de 4 micromètres (page 7, lignes 17-18) : le revêtement n'épouse donc pas la texture rugueuse du substrat.Document FR-A-2 721 240, not published on the priority filing date of this application, describes a coating deposited directly on the wall of a foundry mold, said wall being rough. However, it can be seen from reading FIG. 2 that the roughness of the coating (which is the order of 8 micrometers) is very different from that of the substrate which is of the order of 4 micrometers (page 7, lines 17-18): the coating therefore does not match the rough texture of the substrate.

Le document EP-A-670 190, non publié à la date de dépôt de priorité de la présente demande et déposé par la demanderesse, décrit un revêtement fixé grâce à une sous-couche d'accrochage. Il ne s'agit pas d'un substrat rugueux sur lequel est déposé un revêtement épousant cette texture rugueuse.Document EP-A-670,190, not published on the priority filing date of this application and filed by the applicant, describes a coating fixed by virtue of a bonding sub-layer. It is not a rough substrate on which a coating conforming to this rough texture is deposited.

On a également proposé dans le document EP-A-0 543 444 un moule de fonderie dont la surface est pourvue d'empreintes en creux et sur laquelle on dépose le revêtement protecteur constitué d'un matériau résistant à la corrosion et à l'érosion, tel que le nitrure de titane, le carbure de titane, le carbure de silicium et l'oxyde d'aluminium. Le revêtement est déposé en couche mince. Cependant, les empreintes présentes sur le substrat sont des lignes parallèles ou des cavités formant un dessin régulier : il ne s'agit pas de "rugosité" au sens de la présente demande qui désigne une surface irrégulière (par exemple celle d'un poteyage classique).EP-A-0 543 444 has also proposed a foundry mold, the surface of which is provided with indentations and on which the protective coating consisting of a material resistant to corrosion and erosion is deposited. , such as titanium nitride, titanium carbide, silicon carbide and aluminum oxide. The coating is deposited in a thin layer. However, the imprints present on the substrate are parallel lines or cavities forming a regular pattern: it is not a question of "roughness" within the meaning of the present application which designates an irregular surface (for example that of a conventional coating. ).

Un but de l'invention est de proposer un moule de fonderie qui présente un revêtement réfractaire permanent, c'est-à-dire dont la durée de vie est augmentée de façon substantielle par rapport à celle des revêtements obtenus par poteyage.An object of the invention is to provide a foundry mold which has a permanent refractory coating, that is to say one whose lifetime is increased substantially compared to that of the coatings obtained by coating.

Selon l'invention, le moule de fonderie est caractérisé en ce que la surface interne du substrat présente une texture rugueuse et la couche de protection est une couche mince épousant la texture rugueuse de la surface interne du substrat.According to the invention, the foundry mold is characterized in that the internal surface of the substrate has a rough texture and the protective layer is a thin layer matching the rough texture of the internal surface of the substrate.

On a constaté que l'utilisation directe d'une couche mince d'un revêtement réfractaire déposée par tout moyen approprié sur une surface interne lisse du substrat génère lors de la coulée des défauts de par la non adhérence de la pellicule d'oxyde en surface du moule. Par ailleurs, il s'est avéré qu'il n'était pas possible de "texturer" ce revêtement.It has been found that the direct use of a thin layer of a refractory coating deposited by any suitable means on a smooth internal surface of the substrate generates during casting defects due to the non-adhesion of the oxide film on the surface. of the mold. Furthermore, it turned out that it was not possible to "texturize" this coating.

De façon inattendue, le moule de fonderie et le procédé de réalisation de ce moule selon l'invention évite cette difficulté.Unexpectedly, the foundry mold and the method of producing this mold according to the invention avoids this difficulty.

Par l'expression "moule de fonderie", on entend un substrat formant moule sur lequel est déposé un revêtement de protection.By the expression "foundry mold" is meant a mold-forming substrate on which a protective coating is deposited.

Selon une variante avantageuse, la texture de la surface interne du substrat reproduit celle d'un poteyage classique.According to an advantageous variant, the texture of the internal surface of the substrate reproduces that of a conventional coating.

On doit noter que la texture d'un poteyage classique n'est pas constante et se modifie légèrement au fur et à mesure des coulées. De préférence, la texture correspond à la texture obtenue après quelques coulées.It should be noted that the texture of a classic poteyage is not constant and changes slightly as the casts are poured. Preferably, the texture corresponds to the texture obtained after a few flows.

Le moule selon l'invention est particulièrement approprié pour la coulée de pièces en aluminium ou en alliage à base d'aluminium.The mold according to the invention is particularly suitable for the casting of aluminum or aluminum-based alloy parts.

La nature du matériau pouvant être déposé est très large : métallique, céramiques de type carbures, nitrures, borures, de composition stoechiométrique ou non.The nature of the material that can be deposited is very broad: metallic, ceramic type carbides, nitrides, borides, stoichiometric composition or not.

Parmi les matériaux testés, le TiCNO (oxycarbonitrure de titane) est celui ayant montré la meilleure inertie chimique et thermique vis-à-vis de l'aluminium liquide. Par "couche mince", on entend une couche dont l'épaisseur varie communément entre 20 et 300 µm. Néanmoins, cette couche mince peut avoir une épaisseur beaucoup plus faible comprise entre 2 et 20 µm, de préférence 2 à 6 µm.Among the materials tested, TiCNO (titanium oxycarbonitride) is the one that has shown the best chemical and thermal inertia vis-à-vis liquid aluminum. By "thin layer" is meant a layer whose thickness commonly varies between 20 and 300 μm. However, this thin layer can have a much smaller thickness of between 2 and 20 μm, preferably 2 to 6 μm.

L'invention propose également un procédé pour la réalisation d'un moule de fonderie selon l'invention. Il comprend les étapes suivantes :

  • a) préparation de la surface interne du substrat de façon à lui donner la texture rugueuse appropriée,
  • b) suivie du dépôt en couche mince du matériau réfractaire sur la surface préparée et récupération du moule.
The invention also provides a method for producing a foundry mold according to the invention. It includes the following steps:
  • a) preparation of the internal surface of the substrate so as to give it the appropriate rough texture,
  • b) followed by the deposition in a thin layer of the refractory material on the prepared surface and recovery of the mold.

D'autres caractéristiques et avantages de l'invention ressortiront encore de la description du procédé de réalisation qui suit. Cette description est purement illustrative et non limitative. Elle doit être lue en regard des figures 1 et 2 annexées sur lesquelles on a représenté schématiquement, en vue en coupe, un détail avec arraché d'un substrat de texture appropriée (figure 1) et d'un moule de fonderie 1 selon l'invention (figure 2).Other characteristics and advantages of the invention will emerge from the description of the production method which follows. This description is purely illustrative and not limiting. It should be read with reference to Figures 1 and 2 annexed in which there is shown schematically, in sectional view, a detail with cutaway of a substrate of appropriate texture (Figure 1) and of a foundry mold 1 according to invention (Figure 2).

Selon la figure 1, une partie d'un substrat 2 métallique est soumis à un enlèvement de matière par utilisation connue en soi d'un faisceau laser 4 de façon à obtenir une rugosité 3 correspondant à celle d'un revêtement obtenu par poteyage classique.According to FIG. 1, part of a metallic substrate 2 is subjected to removal of material by the use known per se of a laser beam 4 so as to obtain a roughness 3 corresponding to that of a coating obtained by conventional coating.

La mémorisation préalable de la texture souhaitée par lecture laser et analyse d'image permet de commander au moyen d'un ordinateur le fraisage afin de reproduire fidèlement la structure. La structure réalisée peut également être issue d'une création numérique d'une texture rugueuse assurant la même fonctionnalité à la surface. Ce type de fraisage s'impose de par la finesse des structures constatées ou leur complexité.The prior memorization of the desired texture by laser reading and image analysis allows milling to be controlled by means of a computer in order to faithfully reproduce the structure. The structure produced can also be the result of a digital creation of a rough texture ensuring the same functionality on the surface. This type of milling is essential because of the fineness of the structures observed or their complexity.

Cette première étape est suivie du dépôt sous vide (figure 2) d'une couche mince 5 de matériau réfractaire de type dépôt chimique ou physique en phase vapeur connu en soi.This first step is followed by the deposition under vacuum (FIG. 2) of a thin layer 5 of refractory material of the chemical or physical vapor deposition type known per se.

La liaison avec le substrat s'avère excellente car elle est à la fois mécanique (accrochage) et physico-chimique (grâce à des phénomènes de diffusion).The bond with the substrate is excellent because it is both mechanical (attachment) and physicochemical (thanks to diffusion phenomena).

L'invention est plus particulièrement décrite pour la fonderie des alliages d'aluminium en coquille par gravité. Elle s'applique bien entendu de façon générale à tout moulage en coquille, sans restriction quant à l'alliage coulé, et notamment au moulage en coquille sous haute pression ou sous basse pression.The invention is more particularly described for the foundry of aluminum alloys in shell by gravity. It is of course generally applicable to any shell molding, without restriction as regards the cast alloy, and in particular to high pressure or low pressure shell molding.

En outre, indépendamment du problème technique relatif aux moules de fonderie, précédemment évoqué, il a été constaté que, de façon générale, les pièces métalliques texturées selon le procédé décrit et recouvertes d'un revêtement du type de ceux qui viennent d'être décrits, présentent une résistance thermomécanique et une adhérence de leur revêtement élevées.In addition, independently of the technical problem relating to foundry molds, previously mentioned, it has been found that, in general, the metal parts textured according to the method described and covered with a coating of the type of those which have just been described. , have a high thermomechanical resistance and adhesion of their coating.

Une application avantageuse de l'invention est la fabrication de pièces pour véhicules automobiles, et en particulier la fabrication de pièces de moteurs traitées selon le procédé objet de l'invention.An advantageous application of the invention is the manufacture of parts for motor vehicles, and in particular the manufacture of engine parts treated according to the process which is the subject of the invention.

Claims (13)

Moule de fonderie (1) comprenant un substrat (2) dont la surface interne est revêtue d'une couche (5) protectrice permanente en matériau réfractaire inerte vis-à-vis du métal coulé, caractérisé en ce que ladite surface interne dudit substrat présente une texture rugueuse (3) et ladite couche protectrice est une couche mince épousant la texture rugueuse de la surface interne du substrat.Foundry mold (1) comprising a substrate (2) whose internal surface is coated with a permanent protective layer (5) of refractory material inert towards the cast metal, characterized in that said internal surface of said substrate has a rough texture (3) and said protective layer is a thin layer conforming to the rough texture of the internal surface of the substrate. Moule de fonderie selon la revendication 1, caractérisé en ce que la texture de la surface interne du substrat est celle d'un poteyage classique.Foundry mold according to claim 1, characterized in that the texture of the internal surface of the substrate is that of a conventional coating. Moule de fonderie selon la revendication 1 ou 2, caractérisé en ce que le matériau de la couche protectrice permanente est choisi dans le groupe constitué par les métaux ou les céramiques.Foundry mold according to claim 1 or 2, characterized in that the material of the permanent protective layer is chosen from the group consisting of metals or ceramics. Moule de fonderie selon la revendication 3, caractérisé en ce que les céramiques sont choisies dans le groupe constitué par les carbures, les nitrures, les borures, de composition stoechiométrique ou non.Foundry mold according to claim 3, characterized in that the ceramics are chosen from the group consisting of carbides, nitrides, borides, of stoichiometric composition or not. Moule de fonderie selon la revendication 4, caractérisé en ce que la céramique est l'oxycarbonitrure de titane (TiCNO) de composition stoechiométrique ou non.Foundry mold according to claim 4, characterized in that the ceramic is titanium oxycarbonitride (TiCNO) of stoichiometric composition or not. Moule de fonderie selon la revendication 1, caractérisé en ce que l'épaisseur de la couche mince varie entre 20 et 300 µm.Foundry mold according to claim 1, characterized in that the thickness of the thin layer varies between 20 and 300 µm. Moule de fonderie selon la revendication 1, caractérisé en ce que l'épaisseur de la couche mince est comprise entre 2 et 20 µm, de préférence entre 2 et 6 µm.Foundry mold according to claim 1, characterized in that the thickness of the thin layer is between 2 and 20 µm, preferably between 2 and 6 µm. Moule de fonderie selon la revendication 1, caractérisé en ce qu'il est destiné au moulage d'aluminium ou d'alliages à base d'aluminium.Foundry mold according to claim 1, characterized in that it is intended for the molding of aluminum or aluminum-based alloys. Procédé de réalisation d'un moule de fonderie selon l'une des revendications 1 à 8, caractérisé en ce qu'il comprend les étapes suivantes : a) préparation de la surface interne du substrat de façon à lui donner la texture rugueuse appropriée, b) suivie du dépôt en couche mince du matériau réfractaire sur la surface préparée et récupération du moule. Method for producing a foundry mold according to one of Claims 1 to 8, characterized in that it comprises the following steps: a) preparation of the internal surface of the substrate so as to give it the appropriate rough texture, b) followed by the deposition in a thin layer of the refractory material on the prepared surface and recovery of the mold. Procédé de réalisation selon la revendication 9, caractérisé en ce que l'étape a) est effectuée par fraisage laser.Production method according to claim 9, characterized in that step a) is carried out by laser milling. Procédé de réalisation selon la revendication 10, caractérisé en ce que le fraisage est commandé par un ordinateur ayant mémorisé la texture d'un poteyage par analyse préalable d'une telle texture.Production method according to claim 10, characterized in that the milling is controlled by a computer having memorized the texture of a coating by prior analysis of such a texture. Procédé de réalisation selon la revendication 10, caractérisé en ce que le fraisage est commandé par un ordinateur ayant mémorisé la texture d'un poteyage obtenue par création numérique.Production method according to claim 10, characterized in that the milling is controlled by a computer having memorized the texture of a poteyage obtained by digital creation. Procédé de réalisation selon la revendication 9, caractérisé en ce que l'étape b) est effectuée par dépôt sous vide de type dépôt chimique ou physique en phase vapeur.Production method according to claim 9, characterized in that step b) is carried out by vacuum deposition of the chemical or physical vapor deposition type.
EP96401620A 1995-07-19 1996-07-19 Foundry mould and process for making such a mould Withdrawn EP0754514A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9508721 1995-07-19
FR9508721A FR2736850B1 (en) 1995-07-19 1995-07-19 FOUNDRY MOLD AND METHOD OF MAKING SUCH A MOLD

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EP0754514A1 true EP0754514A1 (en) 1997-01-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257063A (en) * 1960-02-13 1961-03-31 Renault Foundry mold preparation process
EP0543444A1 (en) * 1991-11-22 1993-05-26 BORGO-NOVA SpA Die Coating
GB2273718A (en) * 1988-11-29 1994-06-29 Chromalloy Gas Turbine Corp Preparation and coating of composite surfaces
EP0670190A1 (en) * 1994-03-01 1995-09-06 Automobiles Peugeot Foundry mould and process for making it
FR2721240A1 (en) * 1994-06-21 1995-12-22 Renault Application of refractory coating on metallic mould internal surface

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1257063A (en) * 1960-02-13 1961-03-31 Renault Foundry mold preparation process
GB2273718A (en) * 1988-11-29 1994-06-29 Chromalloy Gas Turbine Corp Preparation and coating of composite surfaces
EP0543444A1 (en) * 1991-11-22 1993-05-26 BORGO-NOVA SpA Die Coating
EP0670190A1 (en) * 1994-03-01 1995-09-06 Automobiles Peugeot Foundry mould and process for making it
FR2721240A1 (en) * 1994-06-21 1995-12-22 Renault Application of refractory coating on metallic mould internal surface

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FR2736850B1 (en) 1997-10-10

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