EP0301928A1 - Method and device for chill casting using a gasifiable pattern in a binderless sand mould - Google Patents
Method and device for chill casting using a gasifiable pattern in a binderless sand mould Download PDFInfo
- Publication number
- EP0301928A1 EP0301928A1 EP88401706A EP88401706A EP0301928A1 EP 0301928 A1 EP0301928 A1 EP 0301928A1 EP 88401706 A EP88401706 A EP 88401706A EP 88401706 A EP88401706 A EP 88401706A EP 0301928 A1 EP0301928 A1 EP 0301928A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mold
- models
- casting
- false
- gasifiable
- 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.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D15/00—Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
-
- 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 present invention relates to the foundry manufacture of castings of cast iron and other ferrous alloys which use the principle of casting on a cooler to obtain zones with a white structure, called "hardened".
- EPS expanded polystyrene
- One of the aims of this invention is to eliminate all the deformations due to the PSE models.
- Another object of this invention is precisely to obtain, after casting of the parts which are surface and locally quenched but with gasifiable models surrounded by coolers, the whole packaged in a sand mold without binder.
- This invention relates to a false mold or conformator in two upper and lower parts, which may contain one or more impressions, that is to say one or more EPS models.
- the imprints of this false mold are formed solely by spans.
- these spans are cleared in order to allow a good distribution of the sand around and in the interstices of the PSE models for obtaining zones with normal structure.
- the assembly must be sufficiently rigid to avoid any deformation of the false mold, in particular during its closing and its cramping.
- the PSE models After closing and cramping the mold, the PSE models are perfectly positioned and held during the filling of the mold with sand without binder and remain immobilized during casting.
- this false mold comprises an upper part 1 assembled on a lower part 2.
- the number of cavities 3 can vary depending on the use and configuration of the box containing the mold; there are for example three in number in these figures.
- the number of active parts or coolers 4 depends on the part to be produced for each impression.
- the clearances 5 of the cooling zones 4 allow the circulation of the sand around and in the interstices of the PSE models during the packaging operation.
- Each imprint is made up of scopes 8.
- the PSE models 9 which are placed in the lower part 2 are based only on scopes 8.
- a casting system 10 made of EPS is connected to the models 9 for example and, as shown in FIG. 4, in the upper part.
- the previously described mold used under the known conditions of implementation of the "lost foam” process, allows: - to make up for the deformations of the PSE models by conforming, - to eliminate the deformations due to the clamping of the sand, - to block the models at the time of casting, - to obtain parts which are superficially and locally hardened directly after casting, without the need for coating, - reduce solidification times, - and to facilitate release operations and to automate them completely.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
Description
La présente invention se rapporte à la fabrication en fonderie de pièces moulées en fonte et autres alliages ferreux qui utilisent le principe de la coulée sur refroidisseur pour obtenir des zones à structure blanche, dites "trempées".The present invention relates to the foundry manufacture of castings of cast iron and other ferrous alloys which use the principle of casting on a cooler to obtain zones with a white structure, called "hardened".
Elle s'applique tout particulièrement aux procédés de moulage qui utilisent un modèle gazéifiable en mousse qui peut être du polystyrène expansé (PSE) et un moule en sable sans liant dont la rigidité s'obtient par compactage au moyen d'une vibration, ou d'une dépression, ou d'une combinaison des deux.It is particularly applicable to molding processes which use a gasifiable foam model which can be expanded polystyrene (EPS) and a sand mold without binder, the rigidity of which is obtained by compacting by means of a vibration, or d depression, or a combination of both.
Dans ces procédés connus sous le nom de "MOUSSE PERDUE", le modèle gazéifiable, qui n'est pas fixé rigidement par rapport au caisson contenant le moule, ne doit subir aucune déformation.In these processes known as "LOST FOAM", the gasifiable model, which is not rigidly fixed relative to the box containing the mold, must not undergo any deformation.
Un des buts de cette invention est de supprimer toutes les déformations dues aux modèles PSE.One of the aims of this invention is to eliminate all the deformations due to the PSE models.
On connaît, en fonderie, un procédé de moulage classique dit "en sable à vert" donnant des empreintes très précises dans lesquelles on peut disposer de petites masses en fonte appelées "refroidisseurs" pour obtenir, après coulée, des pièces trempées superficiellement et localement. C'est ainsi, par exemple, que les cames et l'excentrique de certains arbres à cames peuvent être trempés.We know, in foundry, a conventional molding process called "green sand" giving very precise imprints in which we can have small masses of cast iron called "coolers" to obtain, after casting, parts quenched superficially and locally. Thus, for example, the cams and the eccentric of certain camshafts can be hardened.
Un autre but de cette invention est précisément d'obtenir, après coulée des pièces trempées superficiellement et localement mais avec des modèles gazéifiables entourés de refroidisseurs, le tout emballé dans un moule en sable sans liant.Another object of this invention is precisely to obtain, after casting of the parts which are surface and locally quenched but with gasifiable models surrounded by coolers, the whole packaged in a sand mold without binder.
Cette invention a pour objet un faux-moule ou conformateur en deux parties supérieure et inférieure, pouvant contenir une ou plusieurs empreintes, c'est-à-dire un ou plusieurs modèles PSE.This invention relates to a false mold or conformator in two upper and lower parts, which may contain one or more impressions, that is to say one or more EPS models.
Suivant une particularité essentielle, les empreintes de ce faux-moule sont constituées uniquement par des portées.According to an essential characteristic, the imprints of this false mold are formed solely by spans.
Ces parties actives correspondent très précisément aux zones à structure blanche que l'on désire obtenir sur la pièce.These active parts correspond very precisely to the zones with a white structure which it is desired to obtain on the part.
Suivant une autre particularité de l'invention, ces portées sont dégagées afin de permettre une bonne répartition du sable autour et dans les interstices des modèles PSE pour l'obtention des zones à structure normale.According to another particular feature of the invention, these spans are cleared in order to allow a good distribution of the sand around and in the interstices of the PSE models for obtaining zones with normal structure.
L'ensemble doit être suffisamment rigide pour éviter toute déformation du faux-moule, notamment lors de sa fermeture et de son crampage.The assembly must be sufficiently rigid to avoid any deformation of the false mold, in particular during its closing and its cramping.
Après mise en place des modèles PSE dans l'une des deux parties, inférieure par exemple, la fermeture par coiffage de l'autre partie supérieure permet de rattraper les éventuelles déformations des modèles. Ce conformage des modèles est un des avantages de la présente invention.After installation of the EPS models in one of the two parts, lower for example, the closure by capping of the other upper part makes it possible to catch any possible deformations of the models. This conforming of the models is one of the advantages of the present invention.
Après fermeture et crampage du faux-moule, les modèles PSE sont parfaitement positionnés et tenus pendant le remplissage du moule en sable sans liant et restent immobilisés pendant la coulée.After closing and cramping the mold, the PSE models are perfectly positioned and held during the filling of the mold with sand without binder and remain immobilized during casting.
Ces particularités montrent qu'il est possible avec ce faux-moule double fonction :
- de conformer puis de bloquer les modèles,
- et d'accéléréer la solidification en utilisant les masses métalliques que sont les portées comme les refroidisseurs.These features show that it is possible with this dual-function false mold:
- to conform then to block the models,
- and to accelerate solidification by using the metallic masses that are the surfaces such as the coolers.
D'autres particularités et avantages de l'invention ressortiront plus clairement de la description qui suit d'un mode préféré de réalisation, donné à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels :
- - la figure 1 représente une vue schématique de dessus d'un faux-moule, en position verticale de coulée ;
- - la figure 2 représente une vue schématique de face de ce faux-moule montrant le joint de fermeture de ses parties inférieure et supérieure ;
- - la figure 3 représente une vue schématique de dessus de la partie inférieure de ce faux-moule dans laquelle s'effectue le remmoulage ;
- - et la figure 4 représente une vue schématique et simplifiée d'un moule terminé, prêt à la coulée et pourvu de ce faux-moule.
- - Figure 1 shows a schematic top view of a false mold, in the vertical casting position;
- - Figure 2 shows a schematic front view of this false mold showing the seal of its lower and upper parts;
- - Figure 3 shows a schematic top view of the lower part of this false mold in which the remolding takes place;
- - And Figure 4 shows a schematic and simplified view of a finished mold, ready for casting and provided with this false mold.
Conformément aux figures 1 et 2, ce faux-moule comprend une partie supérieure 1 assemblée sur une partie inférieure 2.In accordance with FIGS. 1 and 2, this false mold comprises an
Le nombre d'empreintes 3 peut varier suivant l'utilisation et la configuration du caisson contenant le moule ; elles sont par exemple au nombre de trois sur ces figures.The number of
Le nombre de parties actives ou refroidisseurs 4 est fonction de la pièce à réaliser pour chaque empreinte.The number of active parts or
Les dégagements 5 des zones refroidissantes 4 permettent la circulation du sable autour et dans les interstices des modèles PSE pendant l'opération d'emballage.The
L'assemblage des deux parties nécessite un centrage 6.The assembly of the two parts requires centering 6.
Le faux-moule après remmoulage des modèles PSE est maintenu fermé par un crampage 7.The mold after re-molding of the PSE models is kept closed by cramping 7.
Chaque empreinte est constituée par des portées 8. Les modèles PSE 9 qui sont placés dans la partie inférieure 2 reposent uniquement sur les portées 8.Each imprint is made up of
Après coiffage de la partie supérieure 1 et crampage 7, les modèles sont conformés et bloqués dans le faux-moule de façon précise.After styling the
Un système de coulée 10 en PSE est raccordé aux modèles 9 par exemple et, comme indiqué par la figure 4, en partie supérieure.A
Les différentes opérations bien connues de la mise en oeuvre du procédé "mousse perdue" demeurent inchangées :
- enduction des modèles 9 et du système de coulée 10,
- séchage de l'enduit,
- remmoulage de l'ensemble faux-moule dans un caisson 11 contenant le moule,
- remplissage et compactage du sable 12,
- mise en place éventuelle d'un godet de coulée 13.The various well-known operations for implementing the "lost foam" process remain unchanged:
- coating of
- plaster drying,
- remolding of the false mold assembly in a
- filling and compacting of
- possible installation of a
Après coulée et refroidissement, la sortie des pièces et le décochage se trouvent simplifiés grâce à la rigidité du faux-moule.After casting and cooling, the removal of the parts and the release are simplified thanks to the rigidity of the faux mold.
Le faux-moule précédemment décrit, utilisé dans les conditions de mise en oeuvre connues du procédé "mousse perdue", permet :
- de rattraper les déformations des modèles PSE par un conformage,
- de supprimer les déformations dues au serrage du sable,
- de bloquer les modèles au moment de la coulée,
- d'obtenir des pièces trempées superficiellement et localement directement après coulée, sans enduisage indispensable,
- de réduire les temps de solidification,
- et de faciliter les opérations de décochage et de les automatiser complètement.The previously described mold, used under the known conditions of implementation of the "lost foam" process, allows:
- to make up for the deformations of the PSE models by conforming,
- to eliminate the deformations due to the clamping of the sand,
- to block the models at the time of casting,
- to obtain parts which are superficially and locally hardened directly after casting, without the need for coating,
- reduce solidification times,
- and to facilitate release operations and to automate them completely.
Le problème de la déformation étant résolu, il est alors possible d'utiliser des modèles PSE de plus faible densité qui produiront moins de gaz à la coulée.The problem of the deformation being solved, it is then possible to use PSE models of lower density which will produce less gas at the casting.
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8710790A FR2618703B1 (en) | 1987-07-30 | 1987-07-30 | FOUNDRY MOLDING DEVICE AND METHOD FOR CASTING ON A COOLER, OF THE TYPE WITH GASIFIABLE MODEL AND BINDERLESS SAND MOLD |
FR8710790 | 1987-07-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0301928A1 true EP0301928A1 (en) | 1989-02-01 |
Family
ID=9353707
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88401706A Withdrawn EP0301928A1 (en) | 1987-07-30 | 1988-07-01 | Method and device for chill casting using a gasifiable pattern in a binderless sand mould |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0301928A1 (en) |
FR (1) | FR2618703B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2685229A1 (en) * | 1991-12-20 | 1993-06-25 | Peugeot | Method for consumable- (disposable-) pattern moulding and refrigerating element for implementing this method |
FR2955274A1 (en) * | 2010-01-19 | 2011-07-22 | Peugeot Citroen Automobiles Sa | LOST MOLD MOLDING PROCESS AND INSTALLATION FOR CARRYING OUT SAID METHOD |
FR2966066A1 (en) * | 2010-10-14 | 2012-04-20 | Peugeot Citroen Automobiles Sa | Lost model casting models made of sublimable material in container/tank, by embedding models in sand by leaving pouring opening and pouring liquid metal into opening, and positioning cooling element in support against surfaces of model |
US20150165520A1 (en) * | 2012-06-12 | 2015-06-18 | Bayerische Motoren Werke Aktiengesellschaft | Cooling Device and Method for Cooling a Component Produced in a Lost Foam Casting Method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4520858A (en) * | 1983-11-02 | 1985-06-04 | General Motors Corporation | Chill-enhanced lost foam casting process |
GB2175521A (en) * | 1985-05-31 | 1986-12-03 | Perkins Engines Group | Manufacture of metal castings having chill-hardened zones |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59191542A (en) * | 1983-04-15 | 1984-10-30 | Toyota Motor Corp | Investment casting method |
JPS6277148A (en) * | 1985-09-30 | 1987-04-09 | Toyota Motor Corp | Method and apparatus for full mold casting by quick solidification |
-
1987
- 1987-07-30 FR FR8710790A patent/FR2618703B1/en not_active Expired
-
1988
- 1988-07-01 EP EP88401706A patent/EP0301928A1/en not_active Withdrawn
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4520858A (en) * | 1983-11-02 | 1985-06-04 | General Motors Corporation | Chill-enhanced lost foam casting process |
GB2175521A (en) * | 1985-05-31 | 1986-12-03 | Perkins Engines Group | Manufacture of metal castings having chill-hardened zones |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 272 (M-622)[2719], 4 septembre 1987, page 166 M 622; & JP-A-62 77 148 (TOYOTA MOTOR CORP.) 09-04-1987 * |
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 57 (M-363)[1780], 13 mars 1985, page 22 M 363; & JP-A-59 191 542 (TOYOTA JIDOSHA K.K.) 30-10-1984 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2685229A1 (en) * | 1991-12-20 | 1993-06-25 | Peugeot | Method for consumable- (disposable-) pattern moulding and refrigerating element for implementing this method |
FR2955274A1 (en) * | 2010-01-19 | 2011-07-22 | Peugeot Citroen Automobiles Sa | LOST MOLD MOLDING PROCESS AND INSTALLATION FOR CARRYING OUT SAID METHOD |
EP2357049A1 (en) * | 2010-01-19 | 2011-08-17 | Peugeot Citroën Automobiles SA | Lost pattern casting process and apparatus for the execution of this process |
FR2966066A1 (en) * | 2010-10-14 | 2012-04-20 | Peugeot Citroen Automobiles Sa | Lost model casting models made of sublimable material in container/tank, by embedding models in sand by leaving pouring opening and pouring liquid metal into opening, and positioning cooling element in support against surfaces of model |
US20150165520A1 (en) * | 2012-06-12 | 2015-06-18 | Bayerische Motoren Werke Aktiengesellschaft | Cooling Device and Method for Cooling a Component Produced in a Lost Foam Casting Method |
Also Published As
Publication number | Publication date |
---|---|
FR2618703A1 (en) | 1989-02-03 |
FR2618703B1 (en) | 1989-12-22 |
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Effective date: 19900430 |
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Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
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Withdrawal date: 19910409 |
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R18W | Application withdrawn (corrected) |
Effective date: 19910409 |