EP0386384A1 - Process for the lost foam casting under pressure of metal pieces - Google Patents
Process for the lost foam casting under pressure of metal pieces Download PDFInfo
- Publication number
- EP0386384A1 EP0386384A1 EP89420215A EP89420215A EP0386384A1 EP 0386384 A1 EP0386384 A1 EP 0386384A1 EP 89420215 A EP89420215 A EP 89420215A EP 89420215 A EP89420215 A EP 89420215A EP 0386384 A1 EP0386384 A1 EP 0386384A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressure
- sand
- overpressure
- model
- metal
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mold Materials And Core Materials (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
- Casting Devices For Molds (AREA)
- Powder Metallurgy (AREA)
- Pens And Brushes (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
La présente invention est relative à un procédé de moulage à mousse perdue et sous pression de pièces métalliques notamment en aluminium et en ses alliages.The present invention relates to a lost foam and pressure molding process for metal parts, in particular aluminum and its alloys.
Il est connu de l'homme de l'art, par exemple par l'enseignement de l'USP N° 3 157 924, d'utiliser pour le moulage des métaux des modèles en mousse de matière organique telle que le polystyrène que l'on plonge dans un moule constitué par du sable sec ne contenant aucun agent de liaison. Industriellement, ces modèles sont généralement revêtus d'un film de matériau réfractaire destiné à améliorer la qualité des pièces moulées. Dans un tel procédé, le métal à mouler, qui a été préalablement fondu, est amené au contact du modèle par l'intermédiaire d'un orifice d'alimentation et de canaux traversant le sable, et se substitue progressivement audit modèle en le brûlant et en le transformant principalement en vapeurs qui s'échappent entre les grains de sable.It is known to those skilled in the art, for example from the teaching of USP No. 3,157,924, to use for molding metals foam models of organic material such as polystyrene as immersed in a mold consisting of dry sand containing no binding agent. Industrially, these models are generally coated with a film of refractory material intended to improve the quality of the molded parts. In such a process, the metal to be molded, which has been previously melted, is brought into contact with the model via a feed orifice and channels passing through the sand, and gradually replaces said model by burning it and mainly by transforming it into vapors which escape between the grains of sand.
Par rapport au moulage classique en moule non permanent, cette technique évite la fabrication préalable, par compactage et agglomération de matériaux réfractaires pulvérulents, de moules rigides associés de façon plus ou moins compliquée à des noyaux et permet une récupération facile des pièces moulées ainsi qu'un recyclage aisé des matériaux de moulage.
Elle est donc plus simple et plus économique que la technique classique. Par ailleurs, elle offre aux concepteurs de pièces moulées une plus grande liberté en ce qui concerne la forme desdites pièces. C'est pourquoi cette technique s'avère de plus en plus séduisante du point de vue industriel.
Cependant, elle est handicapée par plusieurs inconvénients dont deux d'entre eux résultent de mécanismes métallurgiques classiques, à savoir:
- la relative lenteur de la solidification qui favorise la formation de piqûres de gazage provenant de l'hydrogène dissous dans l'alliage d'aluminium liquide.
- la relative faiblesse des gradients thermiques qui favorise la formation de microretassures.Compared to conventional molding in a non-permanent mold, this technique avoids the prior manufacture, by compacting and agglomeration of powdery refractory materials, of rigid molds associated in a more or less complicated way with cores and allows easy recovery of the molded parts as well as easy recycling of molding materials.
It is therefore simpler and more economical than the conventional technique. Furthermore, it offers designers of molded parts greater freedom as regards the shape of said parts. This is why this technique is proving more and more attractive from an industrial point of view.
However, it is handicapped by several drawbacks, two of which result from conventional metallurgical mechanisms, namely:
- The relative slowness of solidification which favors the formation of gassing pits from the hydrogen dissolved in the liquid aluminum alloy.
- the relative weakness of the thermal gradients which favors the formation of microretasures.
C'est dans le but d'éviter de tels inconvénients que la demanderesse a proposé dans la demande de brevet français publiée sous le n° 2 606 688 une invention consistant à appliquer sur le moule après remplissage et avant que la fraction solidifiée du métal ne dépasse 40% en poids une pression gazeuse isostatique de valeur maximale comprise entre 0,5 et 1,5 MPa.It is with the aim of avoiding such disadvantages that the applicant proposed in the French patent application published under No. 2,606,688 an invention consisting in applying to the mold after filling and before the solidified fraction of the metal does not exceeds 40% by weight an isostatic gas pressure of maximum value between 0.5 and 1.5 MPa.
Ainsi le procédé selon ladite invention comprenait les étapes classiques du moulage à mousse perdue, à savoir:
- mettre en oeuvre un modèle de la pièce à mouler formé d'une mousse en matière organique revêtue d'un film de matériau réfractaire;
- immerger ledit modèle dans un moule formé de sable sec sans liant;
- remplir le moule avec le métal à l'état fondu pour brûler ledit modèle, ce remplissage s'effectuant par l'intermédiaire d'un orifice d'alimentation mettant en relation le modèle avec l'extérieur du moule.
- évacuer les vapeurs et résidus liquides émis par ledit modèle pendant sa combustion;
- permettre au métal fondu de se solifier pour obtenir la pièce.Thus, the method according to said invention included the conventional stages of lost foam molding, namely:
- implementing a model of the part to be molded formed from an organic material foam coated with a film of refractory material;
- immerse said model in a mold made of dry sand without binder;
- Fill the mold with the metal in the molten state to burn the said model, this filling being effected by means of a supply orifice connecting the model with the outside of the mold.
- evacuate the vapors and liquid residues emitted by said model during its combustion;
- allow the molten metal to solidify to obtain the part.
Mais la demanderesse l'avait amélioré en ce sens que lorsque le moule avait été rempli complètement, c'est-à-dire quand le métal s'était substitué entièrement au modèle et que la majeure partie des vapeurs avait été évacuée, elle appliquait une pression gazeuse sur le moule; cette opération pouvant être réalisée en plaçant le moule dans une enceinte apte à tenir à la pression et reliée à une source de gaz sous pression.
Cette opération pouvait être faite immédiatement après le remplissage alors que le métal était encore entièrement liquide, mais elle pouvait encore avoir lieu plus tard pour autant que la fraction solidifiée de métal dans le moule ne dépassat pas 40%, valeur au-delà de laquelle la pression aurait eu un effet négligeable.
De préférence, la valeur de la pression appliquée était au maximum comprise entre 0,5 et 1,5 MPa: une valeur inférieure à 0,5 MPa étant d'un effet insuffisant et une valeur supérieure à 1,5 MPa entraînant des coûts d'exploitation élevés.
On constatait alors qu'on augmentait considérablement la compacité des pièces en éliminant ou tout au moins en réduisant les piqûres de gazage et les microretassures et améliorait ainsi leurs caractéristiques mécaniques. Toutefois, cela provoquait l'apparition d'un nouvel inconvénient appelé "l'abreuvage".
En effet, quand on établit une pression sur un moule de moulage à mousse perdue sans plus de précautions, ladite pression s'exerce d'une part directement sur l'orifice d'alimentation en métal où elle est transmise pratiquement instantanément à toute la masse de métal liquide, d'autre part à la surface du sable où elle est transmise avec une intensité progressivement atténuée par l'effet de perte de charge à travers les grains de sable. Il s'établit donc un déséquilibre de pression entraînant une surpression Δ P du métal par rapport au sable au niveau de leur interface c'est-à-dire à l'endroit où le modèle était en contact avec le sable. Ce déséquilibre est temporaire et se produit peu après l'application de la pression pour se résorber ensuite.But the Applicant had improved it in the sense that when the mold had been completely filled, that is to say when the metal had entirely replaced the model and the major part of the vapors had been evacuated, it applied a gas pressure on the mold; this operation can be carried out by placing the mold in an enclosure capable of withstanding the pressure and connected to a source of pressurized gas.
This operation could be done immediately after filling while the metal was still completely liquid, but it could still take place later as long as the solidified fraction of metal in the mold did not exceed 40%, value beyond which the pressure would have had a negligible effect.
Preferably, the value of the pressure applied was at most between 0.5 and 1.5 MPa: a value less than 0.5 MPa being of insufficient effect and a value greater than 1.5 MPa resulting high operating costs.
It was then observed that the compactness of the parts was considerably increased by eliminating or at least reducing gassing pits and micro-shrinkage and thus improving their mechanical characteristics. However, this caused the appearance of a new drawback called "watering".
In fact, when a pressure is established on a lost foam molding mold without more precautions, said pressure is exerted on the one hand directly on the metal supply orifice where it is transmitted practically instantaneously to the whole mass liquid metal, on the other hand to the surface of the sand where it is transmitted with an intensity gradually attenuated by the pressure drop effect through the grains of sand. It therefore establishes a pressure imbalance causing an overpressure Δ P of the metal relative to the sand at their interface, that is to say at the place where the model was in contact with the sand. This imbalance is temporary and occurs soon after the pressure is applied and then subsides.
Si cette surpression est trop grande, elle provoque une pénétration du métal entre les grains de sable et entraîne une déformation de la surface de la pièce. C'est en cela que consiste le phénomène dit d "abreuvage". Pour y parer, il fallait donc chercher à diminuer le plus possible cette surpression et la demanderesse y était parvenue dans la demande principale en procédant à l'application d'une pression qui croît progressivement dans le temps de la valeur O jusqu'à la valeur maximum souhaitée après quoi on maintenait cette pression jusqu'à solidification complète du métal. En effet, plus la pression est faible au début de son application, plus le déséquilibre est faible. On est ainsi amené à définir une vitesse d'accroissement de la pression suffisamment faible pour avoir une surpression réduite.
Mais outre ce phénomène d'abreuvage et les inconvénients résultant des mécanismes métallurgiques classiques évoqués ci-dessus auxquels une solution avait été apportée, la demanderesse s'est aperçue de deux autres inconvénients résultant ceux-là de mécanismes absolument spécifiques au procédé à mousse perdue et qui sont:
- la formation de soufflures due à des résidus gazéfiés de la mousse
- la formation d'inclusions de carbone associées à des oxydes et consé cutive au contact de l'alliage d'aluminium liquide avec des résidus carbonés de la mousse.If this overpressure is too great, it causes metal to penetrate between the grains of sand and results in deformation of the surface of the part. This is what the phenomenon known as "watering" consists of. To counter this, it was therefore necessary to seek to reduce this overpressure as much as possible and the plaintiff had achieved this in the main request by applying a pressure which gradually increases in time from the value O to the value maximum desired after which this pressure was maintained until complete solidification of the metal. In fact, the lower the pressure at the start of its application, the lower the imbalance. It is thus necessary to define a rate of increase in the pressure low enough to have a reduced overpressure.
But in addition to this watering phenomenon and the drawbacks resulting from the conventional metallurgical mechanisms mentioned above to which a solution had been provided, the Applicant has noticed two other drawbacks resulting therefrom from mechanisms absolutely specific to the lost foam process and which are:
- the formation of blisters due to gasified residues of the foam
- the formation of carbon inclusions associated with oxides and conserved cutive in contact with the liquid aluminum alloy with carbonaceous residues of the foam.
D'où des recherches complémentaires qui ont abouti aux conclusions suivantes.
Comme on l'a vu plus haut, la pratique industrielle du moulage à modèle perdu consiste à revêtir les modèles d'un film de matériau réfractaire généralement formé de particules de céramique agglomérées par un liant. Ce film agit comme suit: au moment de la coulée du métal liquide, la mousse fabriquée le plus souvent à partir de polystyrène est éliminée à la fois sous la forme gazeuse et liquide. La couche réfractaire est chargée de réguler l'élimination de la forme gazeuse par sa perméabilité et d'absorber la forme liquide. D'une façon générale, la perméabilité doit être adaptée à la pièce afin d'assurer le maintien d'un matelas de gaz entre métal liquide et mousse et le pouvoir absorbant doit être maximum pour éliminer les résidus liquides.
Ainsi à la fin du remplissage du moule, la couche réfractaire se trouve saturée en résidus, l'excès par rapport à la saturation s'étant échappé dans le sable. On a donc dans le moule le métal ayant une température de 600 à 800°C en contact avec cette couche saturée en matière organique d'où peut résulter une gazéification du liquide qui génère alors une pression telle que du gaz pénètre dans le métal et y forme des soufflures tout en provoquant l'apparition d'inclusions de carbone provenant d'une combustion incomplète des résidus de mousse.Hence additional research which led to the following conclusions.
As seen above, the industrial practice of lost-model molding consists in coating the models with a film of refractory material generally formed of ceramic particles agglomerated by a binder. This film acts as follows: at the time of the pouring of the liquid metal, the foam produced most often from polystyrene is eliminated in both gaseous and liquid form. The refractory layer is responsible for regulating the elimination of the gaseous form by its permeability and for absorbing the liquid form. In general, the permeability must be adapted to the room in order to ensure the maintenance of a gas blanket between liquid metal and foam and the absorbency must be maximum to eliminate the liquid residues.
Thus at the end of the filling of the mold, the refractory layer is saturated with residues, the excess relative to the saturation having escaped into the sand. There is therefore in the mold the metal having a temperature of 600 to 800 ° C. in contact with this layer saturated with organic matter from which may result a gasification of the liquid which then generates a pressure such that gas penetrates into the metal and there forms puffs while causing carbon inclusions from incomplete combustion of foam residues.
Pour éviter cet inconvénient, il faut donc créer une surpression suffisante dans le métal liquide par rapport à l'espace situé dans le sable derrière le film afin de provoquer l'évacuation des résidus gazeux et liquides vers le sable et d'empêcher ainsi leur entrée dans le métal.
Mais, cela va à l'encontre de la solution adoptée pour éviter l'abreuvage qui consistait à réduire le plus possible la vitesse d'accroissement de la pression pour diminuer le plus possible cette surpression.
La demanderesse a ainsi trouvé qu'il était impératif pour éviter l'abreuvage et la pénétration des résidus dans le métal de se situer dans une fourchette de surpression d'où le perfectionnement selon l'invention qui consiste à utiliser une vitesse d'accroissement de la pression. telle qu'en fonction de la granulométrie du sable et de la profondeur d'immersion du modèle elle génère rapidement et temporairement par perte de charge à travers le sable une surpression du métal fondu par rapport au sable au niveau de leur interface, cette surpression atteignant une valeur comprise entre deux limites et décroissant ensuite à mesure que ladite pression augmente puis à maintenir ladite pression constante jusqu 'à solidification complète.To avoid this drawback, it is therefore necessary to create a sufficient overpressure in the liquid metal relative to the space located in the sand behind the film in order to cause the evacuation of gaseous and liquid residues towards the sand and thus prevent their entry. in metal.
However, this goes against the solution adopted to avoid watering which consisted in reducing as much as possible the rate of increase in pressure to reduce this overpressure as much as possible.
The Applicant has thus found it imperative to avoid watering and the penetration of residues in the metal to be located in an overpressure range hence the improvement according to the invention which consists in using a speed of increase of pressure. such that depending on the granulometry of the sand and the depth of immersion of the model it generates quickly and temporarily by pressure drop across the sand an overpressure of the molten metal with respect to the sand at their interface, this overpressure reaching a value between two limits and then decreasing as said pressure increases and then maintaining said constant pressure until solidification complete.
De préférence, la valeur de cette vitesse se situe entre 0,003 et 0,3 MPa par seconde et est d'autant plus petite que l'épaisseur de la pièce est grande, des valeurs de vitesse extérieures à cette fourchette faisant prédominer l'un ou l'autre des deux inconvénients.Preferably, the value of this speed is between 0.003 and 0.3 MPa per second and the smaller the thickness of the part, the greater the speed values outside this range, making one or more the other of the two drawbacks.
Cette vitesse doit évidemment tenir compte de la perte de charge à travers le moule c'est-à-dire de la granulométrie du sable et aussi de la profondeur d'immersion du modèle dans le sable.
C'est pourquoi, on la choisit en fonction de ces paramètres et de manière à obtenir des valeurs de surpression comprises entre 0,001 et 0,030 MPa et de préférence entre 0,002 et 0,010 MPa.
Cette surpression est nécessaire seulement pendant une période critique qui suit immédiatement le remplissage de pièce et où le film est encore saturé de produits non totalement vaporisés. De préférence, cette surpression est atteinte en moins de 2 secondes après application de la pression, moment où le phénomène d'abreuvage est le plus important.This speed must obviously take into account the pressure drop across the mold, that is to say the grain size of the sand and also the depth of immersion of the model in the sand.
This is why it is chosen as a function of these parameters and so as to obtain overpressure values of between 0.001 and 0.030 MPa and preferably between 0.002 and 0.010 MPa.
This overpressure is necessary only during a critical period immediately following the filling of the room and when the film is still saturated with products which are not completely vaporized. Preferably, this overpressure is reached in less than 2 seconds after application of the pressure, when the watering phenomenon is most significant.
L'invention peut être illustrée à l'aide des exemples d'application suivants qui portent sur le moulage de collecteur et de culasse de moteur à combustion interne dans des conditions qui tiennent compte de la granulométrie du sable et de la profondeur d'immersion du modèle afin de se situer dans les fourchettes de surpression revendiquées.
Ces conditions et les paramètres des moules utilisés figurent dans le tableau 1 suivant:
These conditions and the parameters of the molds used are shown in Table 1 below:
Les pièces ainsi moulées présentaient très peu de soufflures et aucune incrustation de carbone, ce qui montre l'efficacité du perfectionnement selon l'invention.The parts thus molded had very little blowing and no carbon encrustation, which shows the effectiveness of the improvement according to the invention.
Claims (5)
- mettre en oeuvre un modèle de la pièce à mouler formé d'une mousse en matière organique revêtue d'un film de réfractaire;
- immerger ledit modèle dans un moule formé de sable sec sans liant;
- remplir le moule avec le métal à l'état fondu pour brûler ledit modèle;
- évacuer les vapeurs et résidus liquides émis par le modèle;
- permettre au métal fondu de se solifier pour obtenir ladite pièce;
- appliquer sur le moule avant que la fraction solidifiée de métal dépasse 40% en poids, une pression isostatique de valeur maximale comprise entre 0,5 et 1,5 MPa caractérisé en ce que ladite pression s'accroît avec une vitesse telle qu'en fonction de la granulométrie du sable, de la profondeur d'immersion du modèle elle génère rapidement et temporairement par perte de charge à travers le sable une surpression du métal fondu par rapport au sable au niveau de leur interface, cette surpression atteignant une valeur comprise entre deux limites et décroissant ensuite à mesure que ladite pression augmente puis à maintenir ladite pression constante jusqu'à solidification complète.1. A process for molding lost foam and under pressure of metal parts comprising the following steps:
- implementing a model of the part to be molded formed of an organic material foam coated with a refractory film;
- immerse said model in a mold made of dry sand without binder;
- Fill the mold with the metal in the molten state to burn said model;
- evacuate the vapors and liquid residues emitted by the model;
- allow the molten metal to solidify to obtain said part;
- Apply to the mold before the solidified fraction of metal exceeds 40% by weight, an isostatic pressure of maximum value between 0.5 and 1.5 MPa characterized in that said pressure increases with a speed such that depending on the granulometry of the sand, the depth of immersion of the model, it quickly and temporarily generates an overpressure of the molten metal relative to the sand at the level of their interface by pressure drop across the sand, this overpressure reaching a value between two limits and then decreasing as said pressure increases then maintaining said pressure constant until complete solidification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT89420215T ATE81044T1 (en) | 1989-03-07 | 1989-06-13 | PROCESS FOR FULL MOLD CASTING OF METALLIC OBJECTS UNDER PRESSURE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR898903706A FR2644087B2 (en) | 1986-11-17 | 1989-03-07 | IMPROVEMENT IN THE LOSS FOAM MOLDING PROCESS OF METAL PARTS |
| FR8903706 | 1989-03-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0386384A1 true EP0386384A1 (en) | 1990-09-12 |
| EP0386384B1 EP0386384B1 (en) | 1992-09-30 |
Family
ID=9379922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89420215A Expired - Lifetime EP0386384B1 (en) | 1989-03-07 | 1989-06-13 | Process for the lost foam casting under pressure of metal pieces |
Country Status (19)
| Country | Link |
|---|---|
| EP (1) | EP0386384B1 (en) |
| JP (1) | JPH0626748B2 (en) |
| KR (1) | KR920003686B1 (en) |
| AR (1) | AR241761A1 (en) |
| AT (1) | ATE81044T1 (en) |
| AU (1) | AU600413B2 (en) |
| BR (1) | BR8903257A (en) |
| CA (1) | CA1335689C (en) |
| DE (1) | DE68903103T2 (en) |
| DK (1) | DK320189A (en) |
| ES (1) | ES2034726T3 (en) |
| FI (1) | FI93322C (en) |
| GR (1) | GR3005937T3 (en) |
| IE (1) | IE63394B1 (en) |
| MX (1) | MX172962B (en) |
| NO (1) | NO172968C (en) |
| PT (1) | PT91078B (en) |
| RU (1) | RU1836177C (en) |
| UA (1) | UA13214A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301739A (en) * | 1992-06-30 | 1994-04-12 | Cook Arnold J | Method for casting and densification |
| EP1375033A1 (en) * | 2002-06-27 | 2004-01-02 | Howmet Research Corporation | Investment casting under pressure |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2651453B2 (en) * | 1989-09-07 | 1994-03-25 | Pechiney Aluminium | IMPROVEMENT IN THE LOST FOAM AND PRESSURE MOLDING PROCESS OF METAL PARTS. |
| RU2312738C1 (en) * | 2006-02-09 | 2007-12-20 | Открытое акционерное общество "Новосибирский завод химконцентратов" | Investment casting method at pressure crystallization and apparatus for performing the same |
| CN103556011B (en) * | 2013-11-22 | 2015-10-21 | 山东蒙沃变速器有限公司 | A kind of lost foam casting aluminum alloy materials and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR887120A (en) * | 1941-11-19 | 1943-11-04 | Silumin Ges M B H | Molding process |
| EP0152754A1 (en) * | 1984-02-15 | 1985-08-28 | Pont-A-Mousson S.A. | Foundry moulding process and mould for low-pressure precision casting with a gasifiable model and binderless sand mould |
| GB2159445A (en) * | 1984-06-02 | 1985-12-04 | Cosworth Res & Dev Ltd | Low-pressure, upward casting of metal articles |
| FR2606688A1 (en) * | 1986-11-17 | 1988-05-20 | Pechiney Aluminium | PROCESS FOR LOST FOAM MOLDING OF METALLIC PARTS |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3420291A (en) * | 1965-12-29 | 1969-01-07 | Trw Inc | Method for reducing metal casting porosity |
| DE3760303D1 (en) * | 1986-04-11 | 1989-08-17 | Alusuisse | Process and plant for pressure casting |
| US4724889A (en) * | 1987-04-27 | 1988-02-16 | Ford Motor Company | Degating technique for clustered castings made by ECP |
-
1989
- 1989-06-13 AT AT89420215T patent/ATE81044T1/en not_active IP Right Cessation
- 1989-06-13 DE DE8989420215T patent/DE68903103T2/en not_active Expired - Lifetime
- 1989-06-13 EP EP89420215A patent/EP0386384B1/en not_active Expired - Lifetime
- 1989-06-13 ES ES198989420215T patent/ES2034726T3/en not_active Expired - Lifetime
- 1989-06-21 CA CA000603469A patent/CA1335689C/en not_active Expired - Fee Related
- 1989-06-27 NO NO892666A patent/NO172968C/en unknown
- 1989-06-28 IE IE209789A patent/IE63394B1/en not_active IP Right Cessation
- 1989-06-28 DK DK320189A patent/DK320189A/en not_active Application Discontinuation
- 1989-06-28 MX MX016629A patent/MX172962B/en unknown
- 1989-06-28 FI FI893154A patent/FI93322C/en not_active Application Discontinuation
- 1989-06-29 AR AR89314302A patent/AR241761A1/en active
- 1989-06-30 BR BR898903257A patent/BR8903257A/en not_active IP Right Cessation
- 1989-07-03 AU AU37804/89A patent/AU600413B2/en not_active Expired
- 1989-07-06 PT PT91078A patent/PT91078B/en not_active IP Right Cessation
- 1989-07-07 JP JP1176969A patent/JPH0626748B2/en not_active Expired - Lifetime
- 1989-07-12 UA UA4614509A patent/UA13214A/en unknown
- 1989-07-12 RU SU4614509A patent/RU1836177C/en active
- 1989-07-21 KR KR1019890010344A patent/KR920003686B1/en not_active IP Right Cessation
-
1992
- 1992-10-12 GR GR920402257T patent/GR3005937T3/el unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR887120A (en) * | 1941-11-19 | 1943-11-04 | Silumin Ges M B H | Molding process |
| EP0152754A1 (en) * | 1984-02-15 | 1985-08-28 | Pont-A-Mousson S.A. | Foundry moulding process and mould for low-pressure precision casting with a gasifiable model and binderless sand mould |
| GB2159445A (en) * | 1984-06-02 | 1985-12-04 | Cosworth Res & Dev Ltd | Low-pressure, upward casting of metal articles |
| FR2606688A1 (en) * | 1986-11-17 | 1988-05-20 | Pechiney Aluminium | PROCESS FOR LOST FOAM MOLDING OF METALLIC PARTS |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5301739A (en) * | 1992-06-30 | 1994-04-12 | Cook Arnold J | Method for casting and densification |
| EP1375033A1 (en) * | 2002-06-27 | 2004-01-02 | Howmet Research Corporation | Investment casting under pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| KR920003686B1 (en) | 1992-05-09 |
| AR241761A1 (en) | 1992-12-30 |
| FI93322B (en) | 1994-12-15 |
| ATE81044T1 (en) | 1992-10-15 |
| JPH0626748B2 (en) | 1994-04-13 |
| NO172968C (en) | 1993-10-06 |
| CA1335689C (en) | 1995-05-30 |
| DK320189A (en) | 1990-09-08 |
| DE68903103T2 (en) | 1993-04-15 |
| PT91078A (en) | 1990-11-07 |
| PT91078B (en) | 1995-07-03 |
| GR3005937T3 (en) | 1993-06-07 |
| MX172962B (en) | 1994-01-26 |
| FI893154A0 (en) | 1989-06-28 |
| UA13214A (en) | 1997-02-28 |
| KR900014059A (en) | 1990-10-22 |
| EP0386384B1 (en) | 1992-09-30 |
| RU1836177C (en) | 1993-08-23 |
| IE63394B1 (en) | 1995-04-19 |
| IE892097L (en) | 1990-09-07 |
| ES2034726T3 (en) | 1993-04-01 |
| FI93322C (en) | 1995-03-27 |
| DE68903103D1 (en) | 1992-11-05 |
| NO892666L (en) | 1990-09-10 |
| AU600413B2 (en) | 1990-08-09 |
| BR8903257A (en) | 1990-09-25 |
| DK320189D0 (en) | 1989-06-28 |
| NO172968B (en) | 1993-06-28 |
| AU3780489A (en) | 1989-10-19 |
| JPH02235546A (en) | 1990-09-18 |
| FI893154A (en) | 1990-09-08 |
| NO892666D0 (en) | 1989-06-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5058653A (en) | Process for lost foam casting of metal parts | |
| EP0296074B1 (en) | Method and apparatus for sand casting composite parts with a fibre insert in a light alloy matrix | |
| CH618361A5 (en) | ||
| FR2662071A1 (en) | CASTING MOLDING PROCESS FOR DENTAL METALS. | |
| EP0461052B1 (en) | Lost foam low-pressure casting of aluminium-alloy pieces | |
| EP0426581B1 (en) | Process for the lost foam casting of metal pieces under controlled pressure | |
| EP0386384B1 (en) | Process for the lost foam casting under pressure of metal pieces | |
| FR2490975A1 (en) | METHOD FOR PRODUCING SHAPED OBJECTS | |
| FR2662072A1 (en) | CASTING MOLDING PROCESS FOR DENTAL METALS. | |
| BE1001292A3 (en) | Method of compression mould materials granules. | |
| US5014764A (en) | Lost-foam casting of aluminum under pressure | |
| EP3645191B1 (en) | Foundry process with hot mold casting | |
| FR2644087A2 (en) | Improvement to the method for lost-foam moulding of metallic components | |
| FR2556996A1 (en) | Method for feeding foundry moulds with metal alloys under controlled differential pressure | |
| CA2016092C (en) | Process and device for supplying moulds with liquid metal | |
| IE893715A1 (en) | Improvement to the process for the lost-foam casting under¹pressure of metal articles | |
| FR2653692A2 (en) | Improvement to the method for moulding metal components, with lost foam and under controlled pressure | |
| CH516361A (en) | Protective steel ingot mould lining - of self-hardening refractory compsn | |
| FR2780964A1 (en) | Forming e.g. decorative objects from glass melt poured into porous plaster investment casting mold is accompanied by airflow through mold to prevent it from reaching decomposition temperature | |
| FR2662961A2 (en) | Lost-foam and low-pressure method for moulding components made from aluminium alloy | |
| JPS60158971A (en) | Casting method of molten steel | |
| FR2647380A1 (en) | Method and device for casting metals using gasifiable patterns and a binderless casting material | |
| PL165322B1 (en) | Method for casting metal under pressure and employing the method of foam precipitates | |
| BE553514A (en) | ||
| BE563948A (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE ES GB GR IT LI LU NL SE |
|
| 17P | Request for examination filed |
Effective date: 19901004 |
|
| 17Q | First examination report despatched |
Effective date: 19920228 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE ES GB GR IT LI LU NL SE |
|
| REF | Corresponds to: |
Ref document number: 81044 Country of ref document: AT Date of ref document: 19921015 Kind code of ref document: T |
|
| ITF | It: translation for a ep patent filed |
Owner name: ING. A. GIAMBROCONO & C |
|
| REF | Corresponds to: |
Ref document number: 68903103 Country of ref document: DE Date of ref document: 19921105 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19921201 |
|
| REG | Reference to a national code |
Ref country code: GR Ref legal event code: FG4A Free format text: 3005937 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FG2A Ref document number: 2034726 Country of ref document: ES Kind code of ref document: T3 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GR Payment date: 19940427 Year of fee payment: 6 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: CH Payment date: 19940518 Year of fee payment: 6 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: SE Payment date: 19940524 Year of fee payment: 6 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: LU Payment date: 19940630 Year of fee payment: 6 Ref country code: NL Payment date: 19940630 Year of fee payment: 6 |
|
| EPTA | Lu: last paid annual fee | ||
| EAL | Se: european patent in force in sweden |
Ref document number: 89420215.9 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19950613 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19950614 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LI Effective date: 19950630 Ref country code: CH Effective date: 19950630 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19951231 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Effective date: 19960101 |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL Ref country code: GR Ref legal event code: MM2A Free format text: 3005937 |
|
| NLV4 | Nl: lapsed or anulled due to non-payment of the annual fee |
Effective date: 19960101 |
|
| EUG | Se: european patent has lapsed |
Ref document number: 89420215.9 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: AT Payment date: 20020517 Year of fee payment: 14 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: BE Payment date: 20020614 Year of fee payment: 14 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: ES Payment date: 20020621 Year of fee payment: 14 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: AT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030613 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: ES Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030614 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: BE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030630 |
|
| BERE | Be: lapsed |
Owner name: *ALUMINIUM PECHINEY Effective date: 20030630 |
|
| REG | Reference to a national code |
Ref country code: ES Ref legal event code: FD2A Effective date: 20030614 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 20050613 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20080731 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20080627 Year of fee payment: 20 |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20090612 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20090612 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20080626 Year of fee payment: 20 |
|
| PGRI | Patent reinstated in contracting state [announced from national office to epo] |
Ref country code: IT Effective date: 20091201 |