EP0599680A1 - Process for producing metal parts by lost pattern moulding, pattern with incorporated hollow insert obtained by said process and metal part obtained using said pattern - Google Patents

Process for producing metal parts by lost pattern moulding, pattern with incorporated hollow insert obtained by said process and metal part obtained using said pattern Download PDF

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Publication number
EP0599680A1
EP0599680A1 EP93402679A EP93402679A EP0599680A1 EP 0599680 A1 EP0599680 A1 EP 0599680A1 EP 93402679 A EP93402679 A EP 93402679A EP 93402679 A EP93402679 A EP 93402679A EP 0599680 A1 EP0599680 A1 EP 0599680A1
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EP
European Patent Office
Prior art keywords
model
hollow
pattern
insert
metal part
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Withdrawn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
EP93402679A
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German (de)
French (fr)
Inventor
Eric Lenoir
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0599680A1 publication Critical patent/EP0599680A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/02—Sand moulds or like moulds for shaped castings
    • B22C9/04—Use of lost patterns
    • B22C9/046—Use of patterns which are eliminated by the liquid metal in the mould

Definitions

  • the invention relates to a manufacturing method by molding in a lost model of metal parts which must include at least one hollow, from models made of expandable polymer.
  • the invention also relates to the model with hollow insert obtained according to this method, as well as the metal part obtained using this model.
  • the lost model molding process consists in making an expandable polymer model having the shape of the metal part to be obtained, introducing this model into a sandbox and pouring liquid metal which follows the shape of the model during that the polymer model vaporizes and disappears.
  • One of these methods consists in first manufacturing model parts comprising recesses, in assembling or gluing these model parts so that the faces comprising the recesses are joined to form a model comprising a hollow having the desired shape.
  • a model is obtained comprising the beads of glue which cause irregularities, on the internal surface of the conduits of the final metal part obtained by casting the metal on this model. These irregularities disturb the flow of fluid inside these conduits. Furthermore, a lack of glue at one or more points of these beads can cause liquid metal to leak during the molding of the metal part in the sandbox.
  • the object of the invention is to remedy these drawbacks by proposing a method of manufacturing metal parts comprising a recess without surface irregularities, from a one-piece expandable polymer model comprising a recess.
  • the subject of the invention is a method of manufacturing metal parts by molding in a lost model from an expandable polymer model, characterized in that it consists in introducing a hollow polymer insert into the manufacturing mold. of the model, to carry out the molding of the model in said mold, to unmold the model with the hollow insert associated therewith and, to carry out using the model the molding of said metal part which will include a hollow in the form from the hollow of the insert.
  • the hollow polymer insert disappears with the model during the casting of the metal part.
  • the hollow of the polymer insert is filled with a material before being introduced into the mold for manufacturing the model.
  • the hollow of the polymer insert is filled with sand or connected to a water circuit, for filling it with water and cooling it during the manufacture of the model.
  • the mold for manufacturing the model has recesses to hold the hollow insert in place in the mold.
  • the filling material of the hollow polymer insert is removed after demolding the model in order to obtain a finished model comprising said hollow insert.
  • the model obtained by the method according to the invention comprises a hollow insert incorporated.
  • the metal part molded from this model has a hollow like the hollow of the insert.
  • Figure 1 is a sectional view of a mold for the manufacture of a model for use in the lost model molding process according to the invention.
  • Figure 2 is a sectional view of a model out of its manufacturing mold.
  • the method according to the invention consists first of all in producing, by extrusion blow-molding or by another technique making it possible to shape plastics of small thickness, a hollow shape which will serve as insert 1.
  • This hollow insert 1 is placed in a mold 2 which has the shape of the model M of expandable polymer which it is desired to obtain.
  • Balls 3 of expandable polymer are injected at 6 into the mold 2, and steam is sent through the walls of the mold. Steam circulates in these expandable polymer beads 3 and sets these beads solid.
  • the steam is then stabilized in order to obtain homogeneous cooking of the model, then the assembly is cooled.
  • a first solution consists in filling the hollow insert 1 with a material 4 such as by example of sand.
  • the mold 2 consisting for example of two half-shells 2a, 2b, has recesses 5 formed in the internal wall of each half-shell of the mold.
  • a second solution consists in connecting the hollow insert 1 to a water circuit (not shown), to fill the insert with water and cool it during the manufacturing operations of the model.
  • the M model with its incorporated insert is then removed from the mold and the filling product is removed from the insert.
  • the polymer insert 1 is therefore part of the model M which then has a hollow.
  • This model M consequently forms a single block which therefore has no roughness at the level of its hollow part visible at 7 in FIG. 2 and delimited by the hollow polymer insert 1.
  • the M model is then placed in a sandbox (not shown) and liquid metal is poured on this M model.
  • the metal takes the form of the M model while the M model itself vaporizes on contact with the molten metal. .
  • the insert 1 disappears at the same time as the rest of the model M and the metal part obtained (not shown) has a recess having the shape of the recess 7 of the insert 1 of the model M.
  • This method of manufacturing metal parts can be implemented for the manufacture of all parts comprising various hollow shapes, such as for example water circuits, oil circuits, intake pipes, exhaust pipes or cylinder heads.
  • the filling material of the hollow insert can be of any suitable nature.

Abstract

The present invention relates to a process for producing a metal part by lost-pattern moulding, using a pattern made of polymer, as well as to the pattern with incorporated insert obtained by this process and to the metal part obtained with this pattern. According to this production method, a hollow polymer insert (1) is introduced into the mould (2) for producing the pattern, the pattern is moulded in the mould (2), the pattern with the hollow insert (1) associated therewith is released from the mould and, using this pattern, the metal part which will include a hollow having the shape of the hollow of the insert (1) is moulded. This process makes it possible to produce any metal part including hollow shapes such as, for example, cylinder heads or fluid circuits. <IMAGE>

Description

L'invention concerne un procédé de fabrication par moulage en modèle perdu de pièces métalliques devant comporter au moins un creux, à partir de modèles en polymère expansible. L'invention vise également le modèle avec insert creux obtenu selon ce procédé, ainsi que la pièce métallique obtenue à l'aide de ce modèle.The invention relates to a manufacturing method by molding in a lost model of metal parts which must include at least one hollow, from models made of expandable polymer. The invention also relates to the model with hollow insert obtained according to this method, as well as the metal part obtained using this model.

On sait que le procédé de moulage en modèle perdu consiste à réaliser un modèle en polymère expansible ayant la forme de la pièce métallique à obtenir, à introduire ce modèle dans un bac à sable et à verser du métal liquide qui épouse la forme du modèle pendant que le modèle en polymère se vaporise et disparait.We know that the lost model molding process consists in making an expandable polymer model having the shape of the metal part to be obtained, introducing this model into a sandbox and pouring liquid metal which follows the shape of the model during that the polymer model vaporizes and disappears.

On connaît déjà des procédés de fabrication de pièces métalliques comportant un creux, par moulage en modèle perdu.Processes are already known for manufacturing metal parts comprising a hollow, by molding in a lost model.

L'un de ces procédés consiste à fabriquer d'abord des parties de modèle comprenant des évidements, à assembler ou à coller ces parties de modèle de façon à ce que les faces comportant les évidements soient jointes pour former un modèle comportant un creux ayant la forme désirée.One of these methods consists in first manufacturing model parts comprising recesses, in assembling or gluing these model parts so that the faces comprising the recesses are joined to form a model comprising a hollow having the desired shape.

Mais, selon ce procédé, on obtient un modèle comportant les bourrelets de colle qui entraînent des irrégularités, sur la surface interne des conduits de la pièce métallique finale obtenue par coulée du métal sur ce modèle. Ces irrégularités perturbent les écoulements de fluide à l'intérieur de ces conduits. Par ailleurs, un manque de colle en un ou plusieurs points de ces bourrelets peut entraîner des fuites du métal liquide lors du moulage de la pièce métallique dans le bac à sable.However, according to this method, a model is obtained comprising the beads of glue which cause irregularities, on the internal surface of the conduits of the final metal part obtained by casting the metal on this model. These irregularities disturb the flow of fluid inside these conduits. Furthermore, a lack of glue at one or more points of these beads can cause liquid metal to leak during the molding of the metal part in the sandbox.

L'invention a pour but de remédier à ces inconvénients en proposant un procédé de fabrication de pièces métalliques comportant un creux sans irrégularités de surface, à partir d'un modèle en polymère expansible monobloc comportant un creux.The object of the invention is to remedy these drawbacks by proposing a method of manufacturing metal parts comprising a recess without surface irregularities, from a one-piece expandable polymer model comprising a recess.

A cet effet, l'invention a pour objet un procédé de fabrication de pièces métalliques par moulage en modèle perdu à partir d'un modèle en polymère expansible caractérisé en ce qu'il consiste à introduire un insert creux en polymère dans le moule de fabrication du modèle, à effectuer le moulage du modèle dans ledit moule, à démouler le modèle avec l'insert creux associé à celui-ci et, à effectuer à l'aide du modèle le moulage de ladite pièce métallique qui comportera un creux à la forme du creux de l'insert.To this end, the subject of the invention is a method of manufacturing metal parts by molding in a lost model from an expandable polymer model, characterized in that it consists in introducing a hollow polymer insert into the manufacturing mold. of the model, to carry out the molding of the model in said mold, to unmold the model with the hollow insert associated therewith and, to carry out using the model the molding of said metal part which will include a hollow in the form from the hollow of the insert.

Selon une caractéristique de l'invention, l'insert creux en polymère disparait avec le modèle pendant la coulée de la pièce métallique.According to a characteristic of the invention, the hollow polymer insert disappears with the model during the casting of the metal part.

Selon une autre caractéristique de l'invention, le creux de l'insert en polymère est rempli d'un matériau avant d'être introduit dans le moule de fabrication du modèle.According to another characteristic of the invention, the hollow of the polymer insert is filled with a material before being introduced into the mold for manufacturing the model.

Selon une variante de l'invention, le creux de l'insert en polymère est rempli de sable ou relié à un circuit d'eau, pour son remplissage en eau et son refroidissement lors de la fabrication du modèle.According to a variant of the invention, the hollow of the polymer insert is filled with sand or connected to a water circuit, for filling it with water and cooling it during the manufacture of the model.

Selon encore une autre caractéristique de l'invention, le moule de fabrication du modèle comporte des décrochements pour maintenir l'insert creux en place dans le moule.According to yet another characteristic of the invention, the mold for manufacturing the model has recesses to hold the hollow insert in place in the mold.

Selon une dernière caractéristique de l'invention, le matériau de remplissage de l'insert creux en polymère est évacué après démoulage du modèle afin d'obtenir un modèle fini comportant ledit insert creux.According to a last characteristic of the invention, the filling material of the hollow polymer insert is removed after demolding the model in order to obtain a finished model comprising said hollow insert.

Le modèle obtenu par le procédé selon l'invention comporte un insert creux incorporé.The model obtained by the method according to the invention comprises a hollow insert incorporated.

La pièce métallique moulée à partir de ce modèle comporte un creux à l'image du creux de l'insert.The metal part molded from this model has a hollow like the hollow of the insert.

L'invention sera mieux comprise et d'autres buts, caractéristiques, détails et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative qui va suivre faite en référence aux dessins schématiques annexés donnés uniquement à titre d'exemple illustrant un mode de réalisation de l'invention et dans lesquels.The invention will be better understood and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of example illustrating a mode of the invention and in which.

La figure 1 est une vue en coupe d'un moule servant à la fabrication d'un modèle destiné à être utilisé dans le procédé de moulage en modèle perdu selon l'invention.Figure 1 is a sectional view of a mold for the manufacture of a model for use in the lost model molding process according to the invention.

La figure 2 est une vue en coupe d'un modèle sorti de son moule de fabrication.Figure 2 is a sectional view of a model out of its manufacturing mold.

Le procédé selon l'invention consiste à réaliser tout d'abord, par extrusion-soufflage ou par une autre technique permettant de mettre en forme les plastiques de faible épaisseur, une forme creuse qui servira d'insert 1.The method according to the invention consists first of all in producing, by extrusion blow-molding or by another technique making it possible to shape plastics of small thickness, a hollow shape which will serve as insert 1.

Cet insert creux 1 est déposé dans un moule 2 qui a la forme du modèle M en polymère expansible que l'on souhaite obtenir.This hollow insert 1 is placed in a mold 2 which has the shape of the model M of expandable polymer which it is desired to obtain.

Des billes 3 de polymère expansible sont injectées en 6 dans le moule 2, et de la vapeur est envoyée à travers les parois du moule. La vapeur circule dans ces billes de polymère expansible 3 et réalise la prise en masse de ces billes.Balls 3 of expandable polymer are injected at 6 into the mold 2, and steam is sent through the walls of the mold. Steam circulates in these expandable polymer beads 3 and sets these beads solid.

La vapeur est alors stabilisée afin d'obtenir la cuisson homogène du modèle, puis l'ensemble est refroidi.The steam is then stabilized in order to obtain homogeneous cooking of the model, then the assembly is cooled.

Pour éviter la déformation de l'insert 1, lors de l'opération d'expansion des billes de polymère et lors de l'opération de refroidissement, une première solution consiste à remplir l'insert creux 1 d'un matériau 4 tel que par exemple du sable.To avoid deformation of the insert 1, during the expansion operation of the polymer beads and during the cooling operation, a first solution consists in filling the hollow insert 1 with a material 4 such as by example of sand.

Pour maintenir cet insert 1 en place le moule 2, se composant par exemple de deux demi-coquilles 2a, 2b, comporte des décrochements 5 pratiqués dans la paroi interne de chaque demi-coquille du moule.To keep this insert 1 in place the mold 2, consisting for example of two half-shells 2a, 2b, has recesses 5 formed in the internal wall of each half-shell of the mold.

Une deuxième solution consiste à relier l'insert creux 1 à un circuit d'eau (non représenté), pour remplir d'eau l'insert et le refroidir durant les opérations de fabrication du modèle.A second solution consists in connecting the hollow insert 1 to a water circuit (not shown), to fill the insert with water and cool it during the manufacturing operations of the model.

Le modèle M avec son insert incorporé est ensuite démoulé et on évacue le produit de remplissage de l'insert. L'insert 1 en polymère fait donc partie du modèle M qui comporte alors un creux.The M model with its incorporated insert is then removed from the mold and the filling product is removed from the insert. The polymer insert 1 is therefore part of the model M which then has a hollow.

Ce modèle M forme par conséquent un seul bloc qui ne présente donc aucune aspérité au niveau de sa partie en creux visible en 7 sur la figure 2 et délimitée par l'insert creux 1 en polymère.This model M consequently forms a single block which therefore has no roughness at the level of its hollow part visible at 7 in FIG. 2 and delimited by the hollow polymer insert 1.

Le modèle M est ensuite placé dans un bac à sable (non représenté) et du métal liquide est coulé sur ce modèle M. Le métal prend la forme du modèle M pendant que le modèle M lui-même se vaporise au contact du métal en fusion.The M model is then placed in a sandbox (not shown) and liquid metal is poured on this M model. The metal takes the form of the M model while the M model itself vaporizes on contact with the molten metal. .

L'insert 1 disparait en même temps que le reste du modèle M et la pièce métallique obtenue (non représentée) comporte un creux ayant la forme du creux 7 de l'insert 1 du modèle M.The insert 1 disappears at the same time as the rest of the model M and the metal part obtained (not shown) has a recess having the shape of the recess 7 of the insert 1 of the model M.

Ce procédé de fabrication de pièces métalliques peut être mis en oeuvre pour la fabrication de toutes les pièces comportant des formes en creux diverses, telles que par exemple des circuits d'eau, circuits d'huile, conduits d'admission, conduits d'échappement ou de culasses.This method of manufacturing metal parts can be implemented for the manufacture of all parts comprising various hollow shapes, such as for example water circuits, oil circuits, intake pipes, exhaust pipes or cylinder heads.

Bien entendu l'invention n'est nullement limitée aux modes de réalisation décrits et illustrés qui n'ont été donnés qu'à titre d'exemple.Of course, the invention is in no way limited to the embodiments described and illustrated which have been given only by way of example.

Ainsi, le matériau de remplissage de l'insert creux peut être d'une nature appropriée quelconque.Thus, the filling material of the hollow insert can be of any suitable nature.

Au contraire l'invention comprend tous les équivalents techniques des moyens décrits ainsi que leurs combinaisons si celles-ci sont effectuées suivant son esprit.On the contrary, the invention includes all the technical equivalents of the means described as well as their combinations if these are carried out according to the spirit.

Claims (6)

Procédé de fabrication de pièces métalliques par moulage en modèle perdu, consistant à : - introduire un insert en polymère creux (1) dans le moule (2) de fabrication du modèle (M), - effectuer le moulage du modèle (M) dans ledit moule (2), - démouler le modèle (M) avec l'insert creux (1) associé à celui-ci, et - effectuer à l'aide du modèle (M) le moulage de ladite pièce métallique qui comportera un creux ayant la forme du creux dudit insert (1), cet insert (1) creux en polymère disparaissant avec le modèle (M) pendant la coulée de la pièce métallique, caractérisé en ce que le creux de l'insert (1) en polymère est rempli d'un matériau (4), avant d'être introduit dans le moule (2) de fabrication du modèle (M). Method of manufacturing metal parts by molding in a lost model, comprising: - introduce a hollow polymer insert (1) into the mold (2) for manufacturing the model (M), - molding the model (M) in said mold (2), - unmold the model (M) with the hollow insert (1) associated with it, and - carry out using the model (M) the molding of said metal part which will include a hollow having the shape of the hollow of said insert (1), this hollow polymer insert (1) disappearing with the model (M) during casting of the metal part, characterized in that the hollow of the polymer insert (1) is filled with a material (4), before being introduced into the mold (2) for manufacturing the model (M). Procédé selon la revendication 1, caractérisé en ce que l'insert en polymère creux (1) est rempli de sable ou relié à un circuit d'eau pour son remplissage en eau et son refroidissement lors de la fabrication du modèle (M).Method according to claim 1, characterized in that the hollow polymer insert (1) is filled with sand or connected to a water circuit for filling it with water and cooling it during the manufacture of the model (M). Procédé selon l'une des revendications précédentes, caractérisé en ce que le moule (2) de fabrication du modèle comporte des décrochements (5) pour maintenir l'insert creux (1) en place dans le moule (2).Method according to one of the preceding claims, characterized in that the mold (2) for manufacturing the model comprises recesses (5) to hold the hollow insert (1) in place in the mold (2). Procédé selon l'une des revendications précédentes, caractérisé en ce que le matériau de remplissage de l'insert creux en polymère est évacué après démoulage du modèle (M) afin d'obtenir un modèle (M) fini comportant ledit insert creux.Method according to one of the preceding claims, characterized in that the filling material of the hollow polymer insert is removed after demolding of the model (M) in order to obtain a finished model (M) comprising said hollow insert. Modèle pour moulage en modèle perdu avec insert creux incorporé, obtenu par le procédé suivant l'une des revendications 1 à 4.Model for molding in lost model with incorporated hollow insert, obtained by the process according to one of claims 1 to 4. Pièce métallique moulée obtenue à l'aide du modèle suivant la revendication 5.Molded metal part obtained using the model according to claim 5.
EP93402679A 1992-11-23 1993-10-29 Process for producing metal parts by lost pattern moulding, pattern with incorporated hollow insert obtained by said process and metal part obtained using said pattern Withdrawn EP0599680A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9214045 1992-11-23
FR9214045A FR2698296B1 (en) 1992-11-23 1992-11-23 Method for manufacturing metal parts by molding in a lost model, model with incorporated hollow insert obtained by this method and metal part obtained using this model.

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EP0599680A1 true EP0599680A1 (en) 1994-06-01

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EP93402679A Withdrawn EP0599680A1 (en) 1992-11-23 1993-10-29 Process for producing metal parts by lost pattern moulding, pattern with incorporated hollow insert obtained by said process and metal part obtained using said pattern

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2109779A1 (en) * 1971-03-02 1972-09-07 Correcta-Werke GmbH, 3590 Bad WiIdungen Hollow lost wax foundry mould pattern - is pressurised during mould making
EP0305653A1 (en) * 1987-08-29 1989-03-08 EISENGIESSEREI MONFORTS GMBH &amp; CO Foundry model and process for manufacturing a hollow cast piece
JPH02169147A (en) * 1988-12-23 1990-06-29 Aisin Takaoka Ltd Method for forming lost forming pattern with core
EP0506123A1 (en) * 1991-03-29 1992-09-30 Asahi Tec Corporation Method of preparing disappearing model

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2109779A1 (en) * 1971-03-02 1972-09-07 Correcta-Werke GmbH, 3590 Bad WiIdungen Hollow lost wax foundry mould pattern - is pressurised during mould making
EP0305653A1 (en) * 1987-08-29 1989-03-08 EISENGIESSEREI MONFORTS GMBH &amp; CO Foundry model and process for manufacturing a hollow cast piece
JPH02169147A (en) * 1988-12-23 1990-06-29 Aisin Takaoka Ltd Method for forming lost forming pattern with core
EP0506123A1 (en) * 1991-03-29 1992-09-30 Asahi Tec Corporation Method of preparing disappearing model

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 428 (M - 1025)<4371> 14 September 1990 (1990-09-14) *

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FR2698296A1 (en) 1994-05-27
FR2698296B1 (en) 1994-12-30

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