EP0307287B1 - Mould and method for creating a foundy pattern - Google Patents

Mould and method for creating a foundy pattern Download PDF

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Publication number
EP0307287B1
EP0307287B1 EP88402208A EP88402208A EP0307287B1 EP 0307287 B1 EP0307287 B1 EP 0307287B1 EP 88402208 A EP88402208 A EP 88402208A EP 88402208 A EP88402208 A EP 88402208A EP 0307287 B1 EP0307287 B1 EP 0307287B1
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EP
European Patent Office
Prior art keywords
moulding
mould
segment
pattern
cylinders
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.)
Expired - Lifetime
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EP88402208A
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German (de)
French (fr)
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EP0307287A1 (en
Inventor
Denis Jouguelet
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Automobiles Peugeot SA
Automobiles Citroen SA
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Automobiles Peugeot SA
Automobiles Citroen SA
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Publication of EP0307287A1 publication Critical patent/EP0307287A1/en
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Publication of EP0307287B1 publication Critical patent/EP0307287B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/02—Lost patterns
    • B22C7/023—Patterns made from expanded plastic materials

Definitions

  • the subject of the present invention is a mold for molding a foundry model of an engine cylinder block comprising several cylinders aligned with parallel axes, several bearings for mounting a crankshaft whose axis is perpendicular to the axis of the cylinders, cavities formed around the cylinders and recesses between the bearings and the cylinders.
  • the invention more particularly aims to allow the production of an expanded polystyrene model, used in the molding technique from lost foam medels, known as LOST FOAM or lost foam molding process.
  • the lost models of internal combustion engine cylinder blocks are currently obtained by assembling and gluing different parts of models produced separately as described and shown in document US-A-4632169.
  • the assembly of the various elements has the drawback of causing leaks and cracks, especially in the engine water chamber.
  • This technique also requires precision assembly of the different parts of the model, which can cause numerous faults in the connection area of the different parts.
  • the object of the invention is to propose a mold making it possible to produce a model of cylinder block in a single piece, in particular made of expanded polystyrene.
  • the invention provides a mold of the type comprising three sections of molds superimposed in the direction of the axis of the cylinders, characterized in that it comprises an upper section making it possible to carry out the prior molding of the upper part of the model comprising the cylinders and at least a portion of the cavities, a lower section allowing the prior molding of the lower part of the model comprising the bearings and at least a portion of the recesses, and a central section allowing the molding of the central part of the model comprising the complementary portions of said portions of the cavities and recesses, between said upper and lower parts.
  • the mold comprises an upper removable mold element which cooperates with the upper section, during the prior molding operation of the upper part of the model, to delimit the portions of the cavities and close the opening. of the molding imprint of the upper section which opens to the underside of the latter.
  • the lower and upper faces can be produced in the form of flat faces, perpendicular to the axis of the cylinders, with which cooperate two parallel and opposite plane faces of the central section of the mold.
  • the two preliminary molding steps can be carried out simultaneously.
  • the foundry model 10 made of expanded polystyrene and shown in FIG. 1 has the exact shape of an internal combustion engine cylinder block comprising several aligned cylinders 12, with parallel axes XX, and several bearings 14 for mounting a crankshaft, not shown, the axis YY of which is perpendicular to the axis XX of the cylinders 12.
  • the cylinder block also comprises cavities 16 formed around the cylinders 12 and recesses 18 between the bearings 14 and the cylinders 12.
  • the mold according to the invention comprises three sections of mold 20, 22 and 24 superimposed along the direction of the axis X-X of the cylinders.
  • the upper section 20 makes it possible to pre-mold the upper part 20 ′ of the model in which the cylinders 12 are formed and at least a portion of the cavities 16.
  • the upper section 20 comprises lateral mold elements 26 and 28 as well as a fixed upper element 30 which delimits an imprint 32 in which the prior molding operation of the upper part 20 ′ of the model is carried out.
  • the cavity 32 opens at the lower face 34 of the upper section 20 through an opening 36.
  • the cavity 32 and the corresponding portions of the cavities 16 are also delimited, during the operation of prior molding of the upper part 20 ′ of the model, by an upper removable mold element 38 which cooperates with the mold elements 26, 28 and 30 and which closes the opening 36.
  • the upper section 20, provided with the upper removable mold element 38 constitutes a self-contained mold allowing the upper part 20 'of the foundry model to be produced.
  • the lower mold section 24 is constituted by lateral mold elements 40 and 42 which cooperate with a fixed lower mold element 44 to allow the prior molding of the lower part 24 'of the model comprising the bearings. 14 and at least a portion of the recesses 18 inside a molding cavity 46 which opens at the upper face 48 of the lower section 24.
  • the lower section 24 is provided with a lower removable mold element 50 which cooperates, during the preliminary molding operation of the lower part 24 ′ of the model, with the mold elements 40, 42 and 44 to delimit the molding impression 46 and the portions of the recesses 18 and close the opening 52 of the impression 46.
  • the lower section 24 When equipped with the lower removable mold element 50, the lower section 24 constitutes an autonomous mold, shown in FIG. 5, in which the operation of pre-molding the lower part 24 ′ of the model can be carried out. foundry.
  • the central section 22 of the mold according to the invention also consists of lateral mold elements 54 and 56 which cooperate with removable mold elements 58 to delimit the molding imprint of the central part 22 'of the foundry model.
  • the central section 22 is bounded upwards and downwards by two parallel flat faces 60 and 62 respectively. These opposite flat faces 60 and 62 cooperate respectively with the lower face 34 of the upper section 20 and the upper face 48 of the lower section 24, the latter being planar faces perpendicular to the axis X-X of the cylinders.
  • the mold in three sections according to the invention makes it possible to carry out the molding of a foundry model in one piece according to a process which will now be described.
  • the two preliminary molding operations of the upper 20 ′ and lower 24 ′ parts of the foundry model can be carried out simultaneously.
  • the upper 38 and lower 50 removable mold elements are dismantled.
  • the upper 20 and lower 24 mold sections then appear as shown in FIGS. 6 and 7.
  • the complete mold according to the invention is then produced by interposing the central section 22 between the lower face 34 of the upper section 20 and the upper face 48 of the lower section 24.
  • the three mold sections 20, 22 and 24 having been thus previously positioned and assembled, it only remains to carry out the molding operation of the central part 22 ′ of the model so as to obtain a one-piece foundry model as shown in FIG. 8 which does not require any operation of complementary assembly.
  • Each of the sections 20, 22 and 24 of the mold is conventionally made up of several parts which can, for example, slide and fit together so that they can be dismantled after the final molding operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Description

La présente invention a pour objet un moule pour le moulage d'un modèle de fonderie d'un bloc-cylindres de moteur comportant plusieurs cylindres alignés d'axes parallèles, plusieurs paliers pour le montage d'un vilebrequin dont l'axe est perpendiculaire à l'axe des cylindres, des cavités formées autour des cylindres et des évidements entre les paliers et les cylindres.The subject of the present invention is a mold for molding a foundry model of an engine cylinder block comprising several cylinders aligned with parallel axes, several bearings for mounting a crankshaft whose axis is perpendicular to the axis of the cylinders, cavities formed around the cylinders and recesses between the bearings and the cylinders.

L'invention a plus particulièrement pour but de permettre la réalisation d'un modèle en polystyrène expansé, utilisé dans la technique du moulage à partir de medèles en mousse perdue, connue sous la nom de LOST FOAM ou procédé de moulage à mousse perdue.The invention more particularly aims to allow the production of an expanded polystyrene model, used in the molding technique from lost foam medels, known as LOST FOAM or lost foam molding process.

Dans cette technique, un modèle en matériau en mousse, présentant la forme exacte de la pièce à obtenir, est noyé dans du sable contenu dans un moule, puis le métal liquide est versé dans le moule et prend la place de la mousse qui se volatilise.In this technique, a model made of foam material, having the exact shape of the part to be obtained, is embedded in sand contained in a mold, then the liquid metal is poured into the mold and takes the place of the foam which volatilizes. .

Les modèles perdus de bloc-cylindres de moteur à explosion sont actuellement obtenus par assemblage et collage de différentes parties de modèles réalisées séparément comme décrit et représenté dans le document US-A-4632169. L'assemblage des divers éléments a pour inconvénient d'entraîner des fuites et des criques, notamment dans la chambre d'eau du moteur. Cette technique nécessite également de réaliser avec précision un assemblage délicat des différentes parties du modèle, ce qui peut provoquer de nombreux défauts dans la zone de liaison des différentes parties.The lost models of internal combustion engine cylinder blocks are currently obtained by assembling and gluing different parts of models produced separately as described and shown in document US-A-4632169. The assembly of the various elements has the drawback of causing leaks and cracks, especially in the engine water chamber. This technique also requires precision assembly of the different parts of the model, which can cause numerous faults in the connection area of the different parts.

L'invention a pour but de proposer un moule permettant de réaliser un modèle de bloc-cylindres en une seule pièce, notamment en polystyrène expansé.The object of the invention is to propose a mold making it possible to produce a model of cylinder block in a single piece, in particular made of expanded polystyrene.

Dans ce but l'invention propose un moule du type comportant trois tronçons de moules superposés selon la direction de l'axe des cylindres, caractérisé en ce qu'il comporte un tronçon supérieur permettant de réaliser le moulage préalable de la partie supérieure du modèle comportant les cylindres et au moins une portion des cavités, un tronçon inférieur permettant de réaliser le moulage préalable de la partie inférieure du modèle comportant les paliers et au moins une portion des évidements, et un tronçon central permettant de réaliser le moulage de la partie centrale du modèle comportant les portions complémentaires desdites portions des cavités et des évidements, entre lesdites parties supérieure et inférieure.To this end, the invention provides a mold of the type comprising three sections of molds superimposed in the direction of the axis of the cylinders, characterized in that it comprises an upper section making it possible to carry out the prior molding of the upper part of the model comprising the cylinders and at least a portion of the cavities, a lower section allowing the prior molding of the lower part of the model comprising the bearings and at least a portion of the recesses, and a central section allowing the molding of the central part of the model comprising the complementary portions of said portions of the cavities and recesses, between said upper and lower parts.

Grâce à cette conception de moule dans laquelle un tronçon central est interposé entre deux tronçons extrêmes dans lesquels les parties supérieure et inférieure du modèle ont été préalablement moulées, il est possible de réaliser l'opération de moulage de la partie centrale du modèle tout en assurant une parfaite continuité de la mousse en polystyrène expansé et d'obtenir ainsi un modèle monobloc de bloc-cylindres.Thanks to this mold design in which a central section is interposed between two end sections in which the upper and lower parts of the model have been previously molded, it is possible to carry out the molding operation of the central part of the model while ensuring perfect continuity of the expanded polystyrene foam and thus obtain a monobloc model of cylinder block.

Selon une autre caractéristique de l'invention le moule comporte un élément de moule amovible supérieur qui coopère avec le tronçon supérieur, lors de l'opération de moulage préalable de la partie supérieure du modèle, pour délimiter les portions des cavités et obturer l'ouverture de l'empreinte de moulage du tronçon supérieur qui débouche à la face inférieure de ce dernier.According to another characteristic of the invention, the mold comprises an upper removable mold element which cooperates with the upper section, during the prior molding operation of the upper part of the model, to delimit the portions of the cavities and close the opening. of the molding imprint of the upper section which opens to the underside of the latter.

D'une manière symétrique il comporte également un élément de moule amovible inférieur qui coopère avec le tronçon inférieur, lors de l'opération de moulage préalable de la partie inférieure du modèle, pour délimiter les portions des évidements et obturer l'ouverture de l'empreinte de moulage du tronçon inférieur qui débouche à la face supérieure de ce dernier. Enfin les faces inférieure et supérieure peuvent être réalisées sous la forme de faces planes, perpendiculaires à l'axe des cylindres, avec lesquelles coopèrent deux faces planes parallèles et opposées du tronçon central du moule.In a symmetrical manner, it also includes a lower removable mold element which cooperates with the lower section, during the prior molding operation of the lower part of the model, to delimit the portions of the recesses and close the opening of the molding imprint of the lower section which opens to the upper face of the latter. Finally, the lower and upper faces can be produced in the form of flat faces, perpendicular to the axis of the cylinders, with which cooperate two parallel and opposite plane faces of the central section of the mold.

L'invention propose également un procédé de moulage d'un modèle de fonderie mettant en oeuvre un moule selon l'invention, caractérisé en ce qu'il comporte les étapes suivantes:

  • a1) moulage préalable de la partie supérieure du modèle à l'aide du tronçon supérieur du moule muni de l'élément de moule amovible supérieur;
  • a2) moulage préalable de la partie inférieure du modèle à l'aide du tronçon inférieur du moule muni de l'élément de moule amovible inférieur;
  • b) démontage des éléments de moule amovibles supérieur et inférieur;
  • c) réalisation du moule par interposition du tronçon central entre la face inférieure du tronçon supérieur et la face supérieure du tronçon inférieur, et assemblage des trois tronçons; et
  • d) moulage de la partie centrale du modèle.
The invention also provides a method of molding a foundry model using a mold according to the invention, characterized in that it comprises the following steps:
  • a1) preliminary molding of the upper part of the model using the upper section of the mold provided with the upper removable mold element;
  • a2) preliminary molding of the lower part of the model using the lower section of the mold provided with the lower removable mold element;
  • b) disassembly of the upper and lower removable mold elements;
  • c) making the mold by interposing the central section between the lower face of the upper section and the upper face of the lower section, and assembling the three sections; and
  • d) molding of the central part of the model.

Selon une autre caractéristique du procédé les deux étapes de moulage préalable peuvent être réalisées simultanément.According to another characteristic of the process, the two preliminary molding steps can be carried out simultaneously.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui va suivre pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels:

  • - La figure 1 est une vue schématique simplifiée, en section verticale selon la ligne 3-3 de la figure 2, d'un modèle de fonderie d'un bloc-cylindres de moteur à explosion;
  • - la figure 2 est une vue de dessus du modèle de la figure 1;
  • - la figure 3 est une vue à échelle agrandie et en section selon la ligne 3-3 de la figure 2, du tronçon supérieur d'un moule selon l'invention équipé de son élément de moule amovible supérieur;
  • - la figure 4 est une vue similaire à celle de la figure 3, prise en section selon la ligne 4-4 de la figure 2;
  • - la figure 5 est une vue à échelle agrandie et en section selon la ligne 4-4 de la figure 2, du tronçon inférieur du moule selon l'invention équipé de son élément de moule amovible inférieur;
  • - les figures 6 et 7 sont des vues similaires à celles des figures 4 et 5, après qu'aient été réalisées les opérations de moulage préalable des parties supérieure et inférieure du modèle, et que les éléments de moule amovibles aient été démontés; et
  • - la figure 8 est une vue en section selon la ligne 4-4 de la figure 2 du moule selon l'invention dans laquelle les trois tronçons de moule sont représentés dans leur position superposés et assemblés, et après que la partie centrale du modèle ait été moulée.
Other characteristics and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
  • - Figure 1 is a simplified schematic view, in vertical section along line 3-3 of Figure 2, of a foundry model of an internal combustion engine cylinder block;
  • - Figure 2 is a top view of the model of Figure 1;
  • - Figure 3 is an enlarged view in section along line 3-3 of Figure 2, of the upper section of a mold according to the invention equipped with its upper removable mold element;
  • - Figure 4 is a view similar to that of Figure 3, taken in section along line 4-4 of Figure 2;
  • - Figure 5 is an enlarged view in section along line 4-4 of Figure 2, of the lower section of the mold according to the invention equipped with its lower removable mold element;
  • - Figures 6 and 7 are views similar to those of FIGS. 4 and 5, after the previous molding operations have been carried out on the upper and lower parts of the model, and after the removable mold elements have been dismantled; and
  • - Figure 8 is a sectional view along line 4-4 of Figure 2 of the mold according to the invention in which the three mold sections are shown in their stacked and assembled position, and after the central part of the model has been molded.

Le modèle de fonderie 10 réalisé en polystyrène expansé et représenté à la figure 1 présente la forme exacte d'un bloc-cylindres de moteur à explosion comportant plusieurs cylindres alignés 12, d'axes parallèles X-X, et plusieurs paliers 14 pour le montage d'un vilebrequin, non représenté, dont l'axe Y-Y est perpendiculaire à l'axe X-X des cylindres 12. Le bloc-cylindres comporte également des cavités 16 formées autour des cylindres 12 et des évidements 18 entre les paliers 14 et les cylindres 12.The foundry model 10 made of expanded polystyrene and shown in FIG. 1 has the exact shape of an internal combustion engine cylinder block comprising several aligned cylinders 12, with parallel axes XX, and several bearings 14 for mounting a crankshaft, not shown, the axis YY of which is perpendicular to the axis XX of the cylinders 12. The cylinder block also comprises cavities 16 formed around the cylinders 12 and recesses 18 between the bearings 14 and the cylinders 12.

Comme on peut le voir à la figure 8, le moule selon l'invention comporte trois tronçons de moule 20,22 et 24 superposés selon la direction de l'axe X-X des cylindres.As can be seen in FIG. 8, the mold according to the invention comprises three sections of mold 20, 22 and 24 superimposed along the direction of the axis X-X of the cylinders.

Le tronçon supérieur 20 permet de réaliser le moulage préalable de la partie supérieure 20' du modèle dans laquelle sont formés les cylindres 12 et au moins une portion des cavités 16. Le tronçon supérieur 20 comporte des éléments de moule latéraux 26 et 28 ainsi qu'un élément supérieur fixe 30 qui délimitent une empreinte 32 dans laquelle est réalisée l'opération de moulage préalable de la partie supérieure 20' du modèle. L'empreinte 32 débouche à la face inférieure 34 du tronçon supérieur 20 par une ouverture 36.The upper section 20 makes it possible to pre-mold the upper part 20 ′ of the model in which the cylinders 12 are formed and at least a portion of the cavities 16. The upper section 20 comprises lateral mold elements 26 and 28 as well as a fixed upper element 30 which delimits an imprint 32 in which the prior molding operation of the upper part 20 ′ of the model is carried out. The cavity 32 opens at the lower face 34 of the upper section 20 through an opening 36.

L'empreinte 32 et les portions correspondantes des cavités 16 sont également délimitées, lors de l'opération de moulage préalable de la partie supérieure 20' du modèle, par un élément de moule amovible supérieur 38 qui coopère avec les éléments de moule 26, 28 et 30 et qui obture l'ouverture 36.The cavity 32 and the corresponding portions of the cavities 16 are also delimited, during the operation of prior molding of the upper part 20 ′ of the model, by an upper removable mold element 38 which cooperates with the mold elements 26, 28 and 30 and which closes the opening 36.

Tel qu'il est représenté aux figures 3 et 4, le tronçon supérieur 20, muni de l'élément de moule amovible supérieur 38 constitue un moule autonome permettant la réalisation de la partie supérieure 20' du modèle de fonderie.As shown in Figures 3 and 4, the upper section 20, provided with the upper removable mold element 38 constitutes a self-contained mold allowing the upper part 20 'of the foundry model to be produced.

De la même manière, le tronçon de moule inférieur 24 est constitué par des éléments de moule latéraux 40 et 42 qui coopèrent avec un élément de moule inférieur fixe 44 pour permettre de réaliser le moulage préalable de la partie inférieure 24' du modèle comportant les paliers 14 et au moins une portion des évidements 18 à l'intérieur d'une empreinte de moulage 46 qui débouche à la face supérieure 48 du tronçon inférieur 24.In the same way, the lower mold section 24 is constituted by lateral mold elements 40 and 42 which cooperate with a fixed lower mold element 44 to allow the prior molding of the lower part 24 'of the model comprising the bearings. 14 and at least a portion of the recesses 18 inside a molding cavity 46 which opens at the upper face 48 of the lower section 24.

Comme on peut le voir à la figure 5, le tronçon inférieur 24 est muni d'un élément de moule amovible inférieur 50 qui coopère, lors de l'opération de moulage préalable de la partie inférieure 24' du modèle, avec les éléments de moule 40,42 et 44 pour délimiter l'empreinte de moulage 46 et les portions des évidements 18 et obturer l'ouverture 52 de l'empreinte 46.As can be seen in FIG. 5, the lower section 24 is provided with a lower removable mold element 50 which cooperates, during the preliminary molding operation of the lower part 24 ′ of the model, with the mold elements 40, 42 and 44 to delimit the molding impression 46 and the portions of the recesses 18 and close the opening 52 of the impression 46.

Lorsqu'il est équipé de l'élément de moule amovible inférieur 50, le tronçon inférieur 24 constitue un moule autonomme, représenté à la figure 5, dans lequel peut être réalisée l'opération de moulage préalable de la partie inférieure 24' du modèle de fonderie.When equipped with the lower removable mold element 50, the lower section 24 constitutes an autonomous mold, shown in FIG. 5, in which the operation of pre-molding the lower part 24 ′ of the model can be carried out. foundry.

Le tronçon central 22 du moule selon l'invention est également constitué d'éléments de moule latéraux 54 et 56 qui coopèrent avec des éléments de moule démontables 58 pour délimiter l'empreinte de moulage de la partie centrale 22' du modèle de fonderie.The central section 22 of the mold according to the invention also consists of lateral mold elements 54 and 56 which cooperate with removable mold elements 58 to delimit the molding imprint of the central part 22 'of the foundry model.

Des moyens d'assemblage et de fixation, qui n'ont pas été représentés à la figure 8, permettent de maintenir les trois tronçons de moule superposés. Le tronçon central 22 est délimité vers le haut, et vers le bas, par deux faces planes parallèles 60 et 62 respectivement. Ces faces planes opposées 60 et 62 coopèrent respectivement avec la face inférieure 34 du tronçon supérieur 20 et la face supérieure 48 du tronçon inférieur 24, ces dernières étant des faces planes perpendiculaires à l'axe X-X des cylindres.Assembly and fixing means, which have not been shown in FIG. 8, make it possible to maintain the three superimposed mold sections. The central section 22 is bounded upwards and downwards by two parallel flat faces 60 and 62 respectively. These opposite flat faces 60 and 62 cooperate respectively with the lower face 34 of the upper section 20 and the upper face 48 of the lower section 24, the latter being planar faces perpendicular to the axis X-X of the cylinders.

Comme on peut le constater à la figure 8, le moule en trois tronçons selon l'invention permet de réaliser le moulage d'un modèle de fonderie en une seule pièce selon un procédé que l'on décrira maintenant.As can be seen in FIG. 8, the mold in three sections according to the invention makes it possible to carry out the molding of a foundry model in one piece according to a process which will now be described.

Après avoir réalisé l'assemblage des différents éléments de moule constituant le tronçon supérieur 20, et après avoir équipé ce dernier de l'élément de moule supérieur amovible 38 (figures 3 et 4), on réalise l'opération de moulage préalable de la partie supérieure 20' du modèle de fonderie.After having assembled the different mold elements constituting the upper section 20, and after having equipped the latter with the removable upper mold element 38 (FIGS. 3 and 4), the operation of prior molding of the part is carried out. upper 20 'of the foundry model.

De la même manière, on assemble les différents éléments de moule constituant letronçon inférieur 24 et l'on équipe ce dernier de l'élément de moule amovible inférieur 50, puis l'on réalisé l'opération de moulage préalable de la partie inférieure 24' du modèle de fonderie.In the same way, the various mold elements constituting the lower section 24 are assembled and the latter is fitted with the lower removable mold element 50, then the operation of prior molding of the lower part 24 'is carried out. of the foundry model.

Selon une caractéristique du procédé, et afin d'accélérer les cadences de réalisation des modèles de fonderie, les deux opérations de moulage préalables des parties supérieure 20' et inférieure 24' du modèle de fonderie peuvent être réalisées simultanément.According to a characteristic of the method, and in order to speed up the production rates of the foundry models, the two preliminary molding operations of the upper 20 ′ and lower 24 ′ parts of the foundry model can be carried out simultaneously.

Après avoir réalisé les deux opérations de moulage préalables, on effectue le démontage des éléments de moule amovible supérieur 38 et inférieur 50. Les tronçons de moule supérieur 20 et inférieur 24 se présentent alors tels qu'ils sont illustrés aux figures 6 et 7.After having carried out the two preliminary molding operations, the upper 38 and lower 50 removable mold elements are dismantled. The upper 20 and lower 24 mold sections then appear as shown in FIGS. 6 and 7.

On réalise ensuite le moule complet selon l'invention en interposant le tronçon central 22 entre la face inférieure 34 du tronçon supérieur 20 et la face supérieure 48 du tronçon inférieur 24. Les trois tronçons de moule 20,22 et 24 ayant été ainsi préalablement positionnés et assemblés, il ne reste plus qu'à effectuer l'opération de moulage de la partie centrale 22' du modèle de façon à obtenir un modèle de fonderie monobloc tel qu'il est représenté à la figure 8 qui ne nécessite aucune opération d'assemblage complémentaire.The complete mold according to the invention is then produced by interposing the central section 22 between the lower face 34 of the upper section 20 and the upper face 48 of the lower section 24. The three mold sections 20, 22 and 24 having been thus previously positioned and assembled, it only remains to carry out the molding operation of the central part 22 ′ of the model so as to obtain a one-piece foundry model as shown in FIG. 8 which does not require any operation of complementary assembly.

Chacun des tronçons 20, 22 et 24 du moule est constitué, de façon classique, de plusieurs pièces qui peuvent par exemple coulisser et s'emboîter de manière à pouvoir être démontées après l'opération de moulage finale.Each of the sections 20, 22 and 24 of the mold is conventionally made up of several parts which can, for example, slide and fit together so that they can be dismantled after the final molding operation.

Claims (7)

1. Mould for the moulding of a foundry pattern, especially of expanded polystyrene, of an engine cylinder block (50) comprising several aligned cylinders (12) of parallel axes (X-X), several bearings (14) for the mounting of a crankshaft, the axis (Y-Y) of which is perpendicular to the axis of the cylinders, voids (16) formed round the cylinders and recesses (18) between the bearings and the cylinders, the mould having three mould segments (20, 22, 24) superposed in the direction of the axis of the cylinders, characterized in that it comprises an upper segment (20) making it possible to carry out the prior moulding of the upper part (20') of the pattern comprising the cylinders and at least one portion of the voids, a lower segment (24) making it possible to carry out the prior moulding of the lower part (24') of the pattern comprising the bearings and at least one portion of the recesses, and a central segment (22) making it possible to carry out the moulding of the central part (22') of the pattern comprising the matching portions of the said portions of the voids and of the recesses between the said upper and lower parts (20' and 24').
2. Mould according to Claim 1, characterized in that it possesses an upper removable mould element (38) which interacts with the upper segment (20) during the operation of the prior moulding of the upper part (20') of the pattern, in order to delimit the said portions of the voids and close the orifice (36) of the moulding cavity (32) of the upper segment (20) which opens onto the lower face (34) of the latter.
3. Mould according to Claim 1, characterized in that it possesses a lower removable mould element (50) which interacts with the lower segment (24) during the operation of the prior moulding of the lower part (24') of the pattern, in order to delimit the said portions of the recesses and close the orifice (52) of the moulding cavity (46) of the lower segment (24) which opens onto the upper face (48) of the latter.
4. Mould according to Claims 2 and 3, characterized in that the said lower and upper faces (34 and 48) are plane faces which are perpendicular to the axis of the cylinders with which two opposite parallel plane faces (60, 62) of the central segment (22) interact.
5. Process for the moulding of a foundry pattern, putting into practice a mould according to Claims 1 to 3, characterized in that it involves the following steps:
a1) The prior moulding of the upper part (20') of the pattern by means of the upper segment (20) of the mould equipped with the upper removable mould element (38);
a2) the prior moulding of the lower part (24') of the pattern by means of the lower segment (24) of the mould equipped with the lower removable mould element (50);
b) the removal of the upper and lower removable mould elements (38 and 50);
c) the production of the mould by interposing central segment (22) between the lower face (34) of the upper segment (20) and the upper face (48) of the lower segment (24) and assembling the three segments; and
d) the moulding of the central part (22) of the pattern.
6. Moulding process according to Claim 5, characterized in that the two prior moulding steps (a1) and (a2) are carried out simultaneously.
EP88402208A 1987-09-11 1988-09-01 Mould and method for creating a foundy pattern Expired - Lifetime EP0307287B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8712642A FR2620357B1 (en) 1987-09-11 1987-09-11 MOLD FOR MOLDING A FOUNDRY MODEL AND ITS IMPLEMENTING METHOD
FR8712642 1987-09-11

Publications (2)

Publication Number Publication Date
EP0307287A1 EP0307287A1 (en) 1989-03-15
EP0307287B1 true EP0307287B1 (en) 1991-02-06

Family

ID=9354829

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402208A Expired - Lifetime EP0307287B1 (en) 1987-09-11 1988-09-01 Mould and method for creating a foundy pattern

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US (1) US4884622A (en)
EP (1) EP0307287B1 (en)
JP (1) JPH01157741A (en)
DE (1) DE3861756D1 (en)
FR (1) FR2620357B1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2087763C (en) * 1992-02-11 2002-07-02 Jimmy Cochimin Stator frame for dynamoelectric machine and method for making same
US5681518A (en) * 1995-03-15 1997-10-28 Handy & Harman Automotive Group Process for molding a fuel rail assembly

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2824347A (en) * 1952-11-21 1958-02-25 Bohn Aluminium & Brass Corp Molding machine
US2965938A (en) * 1956-06-21 1960-12-27 Permanent Mold & Die Co Inc Apparatus for casting pistons and the like
DE1113726B (en) * 1958-03-26 1961-09-14 Siemens Ag Process for manufacturing high-voltage insulators from cast resin
US3897816A (en) * 1970-09-07 1975-08-05 Toyoda Automatic Loom Works Foundry pattern assembly
JPS6036930B2 (en) * 1978-04-10 1985-08-23 住友重機械工業株式会社 Molding mold equipment
FR2479044B1 (en) * 1980-03-26 1985-08-23 Rozier Guy FUSES FOR VERY HIGH PRECISION FOUNDRY PIECES, MANUFACTURING METHOD AND METALLURGICAL APPLICATIONS
SU935209A1 (en) * 1980-12-01 1982-06-15 Научно-Исследовательский Институт Специальных Способов Литья Chill mould
FR2509661A1 (en) * 1981-07-17 1983-01-21 Ouest Cie METHOD AND DEVICE FOR MOLDING COMPOSITE PIECES OF PLASTIC MATERIAL
US4533312A (en) * 1982-12-27 1985-08-06 Holdt J W Von Simplified collapsible mold core
US4576568A (en) * 1985-02-25 1986-03-18 E-W Mold & Tool Company, Inc. Injection mold with thin wall hole forming means
US4632169A (en) * 1985-05-01 1986-12-30 Outboard Marine Corporation Two cycle cylinder block foam pattern

Also Published As

Publication number Publication date
FR2620357B1 (en) 1990-01-26
US4884622A (en) 1989-12-05
JPH01157741A (en) 1989-06-21
EP0307287A1 (en) 1989-03-15
DE3861756D1 (en) 1991-03-14
FR2620357A1 (en) 1989-03-17

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