EP0901850B1 - Glue-based method for bonding synthetic pyrolysable materials used in lost pattern casting - Google Patents
Glue-based method for bonding synthetic pyrolysable materials used in lost pattern casting Download PDFInfo
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- EP0901850B1 EP0901850B1 EP19980402219 EP98402219A EP0901850B1 EP 0901850 B1 EP0901850 B1 EP 0901850B1 EP 19980402219 EP19980402219 EP 19980402219 EP 98402219 A EP98402219 A EP 98402219A EP 0901850 B1 EP0901850 B1 EP 0901850B1
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- European Patent Office
- Prior art keywords
- glue
- parts
- approximately
- aqueous emulsion
- weight
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- 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
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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
- B22C7/026—Patterns made from expanded plastic materials by assembling preformed parts
Definitions
- the present invention relates to a method of assembly by bonding of pyrolyzable plastic parts, especially expanded polystyrene, to form an imprint serving as a model lost during metal casting, of the lost pattern type.
- a glue is used for gluing the parts of polystyrene hot-melt, e.g. phenolic resins, emulsions self-adhesive acrylics. These hot melt adhesives are applied to tempered. However, these hot melt adhesives have disadvantages.
- the collage leaves traces along the joint on the model thus assembled. These traces, which are often thicker, form beads. The surfaces to be bonded must be substantially flat to limit the flow of hot-melt adhesives.
- the thickness of the glue deposited constitutes a brake on the advance of the metal front by its volume gas generated hot during its pyrolysis. In addition, the thickness of glue deposited creates metallurgical defects by inclusions of condensates carbon generated during its pyrolysis.
- the present invention therefore aims to overcome these drawbacks.
- An object of the invention is to provide a method of assembling pieces of expanded polystyrene to form an imprint serving as lost model during casting of metals of the lost model type, this process being such that during the pyrolysis of polystyrene, it is released as little gas as possible and as little condensate as possible is formed.
- Another object of the invention is to provide a process mentioned above which makes it possible to obtain metal parts whose surface of the joints has no bead or defect such as lips, chamfer.
- Yet another object of the invention is to provide a method mentioned above which allows the bonding of curved or broken joints to reduce the cutting and decrease the number of parts of the model.
- a fourth object of the invention is to provide a method mentioned above which allows a bonding temperature range very large.
- Yet another object of the invention is to be able to use different heat sources for bonding.
- the invention relates to a method of assembly by bonding of pyrolyzable plastic parts, such as expanded polystyrene, to form an imprint serving as a model lost during the casting of metals of the lost pattern type, by spraying of an aqueous emulsion glue on the parts to be glued, characterized in that a polyurethane-based adhesive is sprayed in aqueous emulsion, then the glue is dried by evaporating the water with heating, at a temperature between about 50 ° C to about 80 ° C, for a period of about 8 minutes to about 3 minutes.
- pyrolyzable plastic parts such as expanded polystyrene
- the invention further has the following features.
- the polyurethane is an elastomer resulting from the polyaddition of a polyisocyanate and a polyester polyol, and the hardener is an aliphatic polyisocyanate.
- the glue contains 3 to 15 parts by weight of hardener.
- the adhesive is deposited at a thickness of between about 60 ⁇ m to about 400 ⁇ m.
- the parts are assembled immediately after drying at a temperature above 65 ° C.
- the pieces at rest for about a maximum of 4 hours if the temperature less than 65 ° C, then reheat the parts to a temperature between about 65 ° C and the temperature of deformation of plastic parts, for example for the expanded polystyrene, around 85 ° C.
- the glue may also contain a dye, such as blue methylene.
- the glue is dried by hot air, radiation infrared or microwave.
- Methylene blue was introduced into the glue.
- the addition of dye in the glue is intended to easily visualize the glue deposit applied to the white expanded polymer. We spray so as to obtain a layer of 100 ⁇ m, less than 400 ⁇ m to avoid drips and more than 60 ⁇ m to deposit the quantity of glue sufficient.
- the adhesive deposit applied by spraying allows, compared to the classic soak impregnation, to deposit a lot of thickness lower dry glue from 30 ⁇ m to 200 ⁇ m.
- This thickness of glue very low prevents sagging, excess thickness, beads and allows to make very difficult curved or broken joints, even impossible to obtain by dipping or by heat sealing. We can thus reduce cuts of complicated models, such as cylinder heads, to reduce their price and improve the quality of the castings.
- the glue is then dried by placing the pieces in an oven, evaporating the water by heating by infrared rays, at 60 ° C., for 8 minutes.
- thermofusible glue based on phenolic resin. The deposit is made by soaking. The parts are dried and assembled. We obtains beads along the gluing line.
- the adhesive according to the invention is pyrolysis by generating little gas and condensate.
- the volume gas is much lower than the gas flow of an adhesive from the prior art.
Description
La présente invention concerne un procédé d'assemblage par collage de pièces en matière synthétique pyrolysable, notamment du polystyrène expansé, pour constituer une empreinte servant de modèle perdu au cours du moulage de métaux, du type à modèle perdu.The present invention relates to a method of assembly by bonding of pyrolyzable plastic parts, especially expanded polystyrene, to form an imprint serving as a model lost during metal casting, of the lost pattern type.
On connaít le procédé de moulage de pièces métalliques dit à modèle perdu. Ce procédé consiste à réaliser un modèle de la pièce avec plusieurs parties d'un polymère pyrolysable, tel que du polystyrène expansé ou du PMMA, ou d'autres copolymères. Ces parties sont collées entre elles pour obtenir le modèle de la pièce. Puis on trempe le modèle dans un enduit liquide, on sèche la pièce. On introduit la pièce ainsi traitée dans un récipient contenant du sable et on effectue le compactage du sable autour de la pièce par vibration. On dépose à l'extrémité supérieure du modèle une coulée de métal en fusion. Le métal qui est à très haute température provoque la pyrolyse du polystyrène et vient prendre sa place. Par refroidissement, on obtient une pièce métallique qui a exactement la forme du modèle. On peut alors retirer la pièce du sable. Les avantages du procédé à modèle perdu sont nombreux. Il permet la souplesse de la conception des formes des pièces. Le matériau de moulage est simple puisqu'il s'agit de sable siliceux. Les pièces fabriquées sont précises en dimension, même si elles sont creuses. Enfin, un tel procédé permet une flexibilité au niveau des cadences de production.We know the method of molding metal parts said to lost model. This process consists in making a model of the part with several parts of a pyrolyzable polymer, such as polystyrene expanded or PMMA, or other copolymers. These parts are glued between them to get the model of the part. Then we dip the model in a liquid coating, the part is dried. We introduce the piece like this treated in a container containing sand and compacting is carried out sand around the part by vibration. We deposit at the end top of the model a casting of molten metal. The metal that is very high temperature causes the pyrolysis of the polystyrene and comes take his place. By cooling, a metallic part is obtained which has exactly the shape of the model. We can then remove the piece of sand. The advantages of the lost model process are numerous. It allows the flexibility in the design of the shapes of the parts. The material of molding is simple since it is silica sand. Rooms manufactured are precise in size, even if they are hollow. Finally, such a method allows flexibility in the rate of production.
On utilise pour le collage des parties de polystyrène une colle thermofusible, par exemple des résines phénoliques, des émulsions acryliques auto-adhésives. Ces colles thermofusibles sont appliquées au trempé. Cependant, ces colles thermofusibles présentent des inconvénients. Le collage laisse des traces le long du joint sur le modèle ainsi assemblé. Ces traces qui sont souvent en surépaisseur forment des bourrelets. Les surfaces à encoller doivent être sensiblement planes pour limiter les coulures des colles thermofusibles. L'épaisseur de la colle déposée constitue un frein à l'avancée du front métallique par son volume de gaz généré à chaud lors de sa pyrolyse. De plus, l'épaisseur de colle déposée crée des défauts métallurgiques par inclusions de condensats carbonés générés lors de sa pyrolyse.A glue is used for gluing the parts of polystyrene hot-melt, e.g. phenolic resins, emulsions self-adhesive acrylics. These hot melt adhesives are applied to tempered. However, these hot melt adhesives have disadvantages. The collage leaves traces along the joint on the model thus assembled. These traces, which are often thicker, form beads. The surfaces to be bonded must be substantially flat to limit the flow of hot-melt adhesives. The thickness of the glue deposited constitutes a brake on the advance of the metal front by its volume gas generated hot during its pyrolysis. In addition, the thickness of glue deposited creates metallurgical defects by inclusions of condensates carbon generated during its pyrolysis.
On a essayé de réduire l'épaisseur de la colle déposée sur la surface de joint à encoller. On a décrit notamment dans le document FR-A-2 681 002 un procédé d'assemblage par collage de pièces en polystyrène expansé par pulvérisation d'une colle acrylique en émulsion ou en suspension aqueuse sur les parties à encoller, en couvrant toute la surface du joint avec un taux de grammage ne dépassant pas 15 g/m2, par séchage de la colle par un balayage d'air chaud et par assemblage par contact des pièces constituant l'empreinte. La colle est à base de copolymères acryliques en émulsion aqueuse.We tried to reduce the thickness of the glue deposited on the joint surface to be glued. There has been described in particular in document FR-A-2 681 002 a method of joining by gluing pieces of expanded polystyrene by spraying an acrylic glue in emulsion or in aqueous suspension on the parts to be glued, covering the entire surface. of the joint with a grammage rate not exceeding 15 g / m 2 , by drying the adhesive by a sweep of hot air and by assembly by contact of the parts constituting the imprint. The glue is based on acrylic copolymers in aqueous emulsion.
Cependant, les procédés connus utilisent des colles qui, lors de la pyrolyse, génèrent des gaz et des condensats (composés solides) en quantité trop importante, ce qui nuit à l'environnement et nécessite des précautions en usine. Par ailleurs, lorsque la colle a été séchée, il est nécessaire d'assembler rapidement les pièces constituant l'empreinte, car la colle déposée perd son pouvoir adhésif dans le temps. Lorsqu'on dépose un dépôt de colle thermofusible par trempage, le bain de colle doit avoir une température contrôlée à plus ou moins 3°C et les cycles de collage doivent être réalisés à plus ou moins 0,1 seconde.However, known methods use adhesives which, when pyrolysis, generate gases and condensates (solid compounds) in too much, which harms the environment and requires factory precautions. Furthermore, when the glue has been dried, it is necessary to quickly assemble the parts constituting the imprint, because the glue deposited loses its adhesive power over time. when deposits a deposit of hot-melt adhesive by soaking, the adhesive bath must have a controlled temperature of plus or minus 3 ° C and the cycles of bonding should be done at approximately 0.1 second.
La présente invention vise donc à pallier ces inconvénients.The present invention therefore aims to overcome these drawbacks.
Un but de l'invention est de fournir un procédé d'assemblage de pièces de polystyrène expansé pour former une empreinte servant de modèle perdu au cours du moulage de métaux du type à modèle perdu, ce procédé étant tel que lors de la pyrolyse du polystyrène, il se dégage le moins de gaz possible et il se forme le moins de condensats possible.An object of the invention is to provide a method of assembling pieces of expanded polystyrene to form an imprint serving as lost model during casting of metals of the lost model type, this process being such that during the pyrolysis of polystyrene, it is released as little gas as possible and as little condensate as possible is formed.
Un autre but de l'invention est de fournir un procédé mentionné ci-dessus qui permette d'obtenir des pièces métalliques dont la surface des joints ne présente pas de bourrelet ni de défaut tel que lèvres, chanfrein.Another object of the invention is to provide a process mentioned above which makes it possible to obtain metal parts whose surface of the joints has no bead or defect such as lips, chamfer.
Encore un autre but de l'invention est de fournir un procédé mentionné ci-dessus qui permette le collage de joints courbes ou brisés pour réduire le découpage et diminuer le nombre de parties du modèle. Yet another object of the invention is to provide a method mentioned above which allows the bonding of curved or broken joints to reduce the cutting and decrease the number of parts of the model.
Un quatrième but de l'invention est de fournir un procédé mentionné ci-dessus qui permette un intervalle de température de collage très large.A fourth object of the invention is to provide a method mentioned above which allows a bonding temperature range very large.
Encore un autre but de l'invention est de pouvoir utiliser différentes sources de chaleur pour effectuer le collage.Yet another object of the invention is to be able to use different heat sources for bonding.
A cet effet l'invention concerne un procédé d'assemblage par collage de pièces en matière synthétique pyrolysable, comme le polystyrène expansé, pour constituer une empreinte servant de modèle perdu au cours du moulage de métaux du type à modèle perdu, par pulvérisation d'une colle en émulsion aqueuse sur les parties à encoller, caractérisé en ce qu'on pulvérise une colle à base de polyuréthanes en émulsion aqueuse, puis on sèche la colle en évaporant l'eau par chauffage, à une température comprise entre environ 50°C à environ 80°C, pendant une durée d'environ 8 minutes à environ 3 minutes.To this end, the invention relates to a method of assembly by bonding of pyrolyzable plastic parts, such as expanded polystyrene, to form an imprint serving as a model lost during the casting of metals of the lost pattern type, by spraying of an aqueous emulsion glue on the parts to be glued, characterized in that a polyurethane-based adhesive is sprayed in aqueous emulsion, then the glue is dried by evaporating the water with heating, at a temperature between about 50 ° C to about 80 ° C, for a period of about 8 minutes to about 3 minutes.
L'invention présente en outre les caractéristiques suivantes.The invention further has the following features.
La colle préférée comprend :
- 100 parties en poids d'une émulsion aqueuse constituée de :
- 50 à 100 % en poids d'une émulsion aqueuse d'un polyuréthane,
- 0 à 50 % en poids d'une émulsion aqueuse d'un copolymère éthylène/acétate de vinyle,
- 0 à 50 % en poids d'une émulsion aqueuse d'un polymère vinylique, acrylique ou vinylacrylique,
- 0 à 20 parties en poids d'un durcisseur choisi parmi les polyisocyanates.
- 100 parts by weight of an aqueous emulsion consisting of:
- 50 to 100% by weight of an aqueous emulsion of a polyurethane,
- 0 to 50% by weight of an aqueous emulsion of an ethylene / vinyl acetate copolymer,
- 0 to 50% by weight of an aqueous emulsion of a vinyl, acrylic or vinyl acrylic polymer,
- 0 to 20 parts by weight of a hardener chosen from polyisocyanates.
De manière avantageuse, le polyuréthane est un élastomère résultant de la polyaddition d'un polyisocyanate et d'un polyester polyol, et le durcisseur est un polyisocyanate aliphatique.Advantageously, the polyurethane is an elastomer resulting from the polyaddition of a polyisocyanate and a polyester polyol, and the hardener is an aliphatic polyisocyanate.
De manière encore plus avantageuse, la colle contient 3 à 15 parties en poids de durcisseur. Even more advantageously, the glue contains 3 to 15 parts by weight of hardener.
On dépose la colle selon une épaisseur comprise entre environ 60 µm à environ 400 µm.The adhesive is deposited at a thickness of between about 60 µm to about 400 µm.
On assemble les pièces immédiatement après le séchage à une température supérieure à 65°C.The parts are assembled immediately after drying at a temperature above 65 ° C.
Selon une autre forme de réalisation de l'invention, on laisse les pièces au repos pendant environ au maximum 4 heures, si la température de séchage est inférieure à 65°C, puis on réchauffe les pièces à une température comprise entre environ 65°C et la température de déformation des pièces de matière synthétique, par exemple pour le polystyrène expansé, environ 85°C.According to another embodiment of the invention, the pieces at rest for about a maximum of 4 hours, if the temperature less than 65 ° C, then reheat the parts to a temperature between about 65 ° C and the temperature of deformation of plastic parts, for example for the expanded polystyrene, around 85 ° C.
La colle peut contenir, en outre, un colorant, comme du bleu de méthylène.The glue may also contain a dye, such as blue methylene.
On réalise le séchage de la colle par air chaud, rayonnement infrarouge ou micro-ondes.The glue is dried by hot air, radiation infrared or microwave.
La description suivante, en regard des exemples annexés à titre non limitatif, permettra de mieux comprendre comment l'invention peut être mise en pratique.The following description, with reference to the examples appended as non-limiting, will allow a better understanding of how the invention can be put into practice.
On pulvérise sur les faces de pièces de polystyrène blanc devant être collées, une colle comprenant
- 100 parties en poids d'une émulsion aqueuse renfermant
- 68,3 % en poids d'une émulsion aqueuse d'un élastomère polyester polyuréthane (40 % d'extrait sec),
- 7,92 % en poids d'une émulsion aqueuse d'un copolymère éthylène/acétate de vinyle (55 % d'extrait sec),
- 18,31 % en poids d'une émulsion aqueuse d'un copolymère vinylacrylique (60 % d'extrait sec),
- 4,68 parties en poids d'un polyisocyanate aliphatique.
- 100 parts by weight of an aqueous emulsion containing
- 68.3% by weight of an aqueous emulsion of a polyurethane polyester elastomer (40% of dry extract),
- 7.92% by weight of an aqueous emulsion of an ethylene / vinyl acetate copolymer (55% of dry extract),
- 18.31% by weight of an aqueous emulsion of a vinyl acrylic copolymer (60% of dry extract),
- 4.68 parts by weight of an aliphatic polyisocyanate.
On a introduit dans la colle du bleu de méthylène. L'addition de colorant dans la colle a pour but de visualiser facilement le dépôt de colle appliqué sur le polymère expansé blanc. On effectue la pulvérisation de façon à obtenir une couche de 100 µm, inférieure à 400 µm pour éviter les coulures et supérieure à 60 µm pour déposer la colle en quantité suffisante.Methylene blue was introduced into the glue. The addition of dye in the glue is intended to easily visualize the glue deposit applied to the white expanded polymer. We spray so as to obtain a layer of 100 μm, less than 400 μm to avoid drips and more than 60 µm to deposit the quantity of glue sufficient.
Le dépôt de colle appliqué par pulvérisation permet, par rapport à l'imprégnation classique au trempé, de déposer une épaisseur beaucoup plus faible de colle sèche de 30 µm à 200 µm. Cette épaisseur de colle très faible évite les coulures, les surépaisseurs, les bourrelets et permet de réaliser des joints courbes ou brisés très difficiles, voire impossibles à obtenir au trempé ou par thermosoudure. On peut ainsi réduire les découpes des modèles compliqués, comme les culasses, pour diminuer leur prix et améliorer la qualité des pièces coulées.The adhesive deposit applied by spraying allows, compared to the classic soak impregnation, to deposit a lot of thickness lower dry glue from 30 µm to 200 µm. This thickness of glue very low prevents sagging, excess thickness, beads and allows to make very difficult curved or broken joints, even impossible to obtain by dipping or by heat sealing. We can thus reduce cuts of complicated models, such as cylinder heads, to reduce their price and improve the quality of the castings.
On sèche ensuite la colle en plaçant les pièces dans une étuve, en faisant évaporer l'eau par chauffage par rayons infrarouges, à 60°C, pendant 8 minutes.The glue is then dried by placing the pieces in an oven, evaporating the water by heating by infrared rays, at 60 ° C., for 8 minutes.
On colle ensuite immédiatement les pièces entre elles, en sortie d'étuve. Ceci permet d'obtenir des modèles rapidement, et donc de travailler en flux tendu.Then immediately glue the pieces together, at the outlet incubator. This allows models to be obtained quickly, and therefore work just in time.
Lors du moulage des pièces à l'aide de modèles fabriqués selon le procédé de l'invention, on obtient peu de dégagement de gaz et peu de résidus solides. Les pièces ont des joints parfaits sans bourrelet.When molding parts using models manufactured according to the process of the invention, there is obtained little gas evolution and little solid residues. The parts have perfect joints without bead.
On répète l'Exemple 1 ci-dessus, cependant, on laisse les pièces au repos à température ambiante (environ 20-25°C), pendant au maximum 4 heures. La colle selon l'invention conserve son pouvoir adhésif.We repeat Example 1 above, however, we leave the pieces at rest at room temperature (about 20-25 ° C), for at maximum 4 hours. The adhesive according to the invention retains its power adhesive.
Pendant une durée maximale de repos de 4 heures, on peut réactiver le pouvoir d'adhésivité de la colle en effectuant un réchauffement compris entre 65°C et 85°C. Si on chauffe à une température inférieure à 65°C, on n'obtient pas le collage attendu. Si on chauffe à une température supérieure à 85°C, cette température étant la température de déformation des modèles pour le polystyrène expansé, on déforme les pièces et la pièce métallique coulée n'est pas convenable. On effectue le réchauffement par rayons infrarouges, puis, par légère pression, pendant environ 1 seconde, on assemble les parties à coller et on assure l'étanchéité définitive entre les parties assemblées.During a maximum rest period of 4 hours, you can reactivate the adhesive power of the glue by making a heating between 65 ° C and 85 ° C. If we heat to a temperature below 65 ° C, the expected bonding is not obtained. If we heats to a temperature above 85 ° C, this temperature being the model deformation temperature for expanded polystyrene, we distorts the parts and the cast metal part is not suitable. The heating is carried out by infrared rays, then, by slight pressure, for about 1 second, we assemble the parts to be glued and the final sealing between the assembled parts is ensured.
On dépose sur les côtés à assembler de deux pièces de polystyrène blanc, un colle termofusible à base de résine phénolique. Le dépôt est fait par trempage. On sèche les pièces et on les assemble. On obtient des bourrelets le long de la ligne de collage.We deposit on the sides to assemble two pieces of white polystyrene, a thermofusible glue based on phenolic resin. The deposit is made by soaking. The parts are dried and assembled. We obtains beads along the gluing line.
On mesure les composés se dégageant lors de la pyrolyse,
respectivement d'une colle de série utilisée habituellement pour le collage
de pièces en polystyrène expansé, d'une colle conforme à l'exemple 1
selon l'invention que l'on fait sécher à 60°C, pendant 5 minutes, et d'un
polystyrène expansé. On place les échantillons dans une enceinte fermée
et on chauffe à 750°C qui est la température de coulée d'un alliage
d'aluminium. On obtient les résultats suivants :
On voit donc qu'à la coulée de l'alliage, la colle selon l'invention se pyrolyse en générant peu de gaz et de condensats. De plus le volume gazeux est bien plus faible que le débit gazeux d'une colle de la technique antérieure.It can therefore be seen that when the alloy is cast, the adhesive according to the invention is pyrolysis by generating little gas and condensate. In addition the volume gas is much lower than the gas flow of an adhesive from the prior art.
Claims (9)
- Method of assembly by gluing of parts made of pyrolysable synthetic material, so as to constitute an impression serving as a lost pattern during the moulding of metals of the lost-pattern type, by spraying a glue in an aqueous emulsion on the parts to be glued,
characterised in that a glue based on polyurethanes in an aqueous emulsion is sprayed on, then the glue is dried by evaporating the water by heating at a temperature between approximately 50°C and approximately 80°C, for a period of approximately 8 minutes to approximately 3 minutes. - Method according to Claim 1,
characterised in that the pyrolysable synthetic material is expanded polystyrene. - Method according to one of Claims 1 and 2,
characterised in that the glue comprises:100 parts by weight of an aqueous emulsion constituted by:the dry content of each of the emulsions being between 40 and 70%,50 to 100% by weight of an aqueous emulsion of a polyurethane,0 to 50% by weight of an aqueous emulsion of a vinyl acetate/ethylene copolymer,0 to 50% by weight of an aqueous emulsion of a vinyl, acrylic or vinyl acrylic polymer,0 to 20 parts by weight of a hardener chosen from among the polyisocyanates. - Method according to one of Claims 1 to 3,
characterised in that the glue is deposited at a thickness between approximately 60 µm and approximately 400 µm. - Method according to one of Claims 1 to 4,
characterised in that the glue is dried at a temperature above 65°C and that the parts are assembled immediately after drying. - Method according to one of Claims 1 to 4,
characterised in that the glue is dried at a temperature below 65°C, the parts are left to rest for approximately a maximum of 4 hours, then the parts are heated at a temperature between approximately 65°C and the deformation temperature of the parts made of synthetic material. - Method according to Claim 6,
characterised in that the parts are heated to approximately 85°C. - Method according to one of the preceding claims,
characterised in that the glue contains a colorant, such as methylene blue. - Method according to one of the preceding claims,
characterised in that the drying of the glue is performed by hot air, infrared radiation or microwaves.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9711220A FR2768068B1 (en) | 1997-09-10 | 1997-09-10 | METHOD OF JOINING BY JOINING PIECES OF SYNTHETIC PYROLYZABLE MATERIAL FOR FOUNDRY MOLDING OF THE LOST MODEL TYPE |
| FR9711220 | 1997-09-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0901850A1 EP0901850A1 (en) | 1999-03-17 |
| EP0901850B1 true EP0901850B1 (en) | 2003-05-21 |
Family
ID=9510915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19980402219 Expired - Lifetime EP0901850B1 (en) | 1997-09-10 | 1998-09-09 | Glue-based method for bonding synthetic pyrolysable materials used in lost pattern casting |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0901850B1 (en) |
| DE (1) | DE69814770T2 (en) |
| ES (1) | ES2194286T3 (en) |
| FR (1) | FR2768068B1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2959145B1 (en) * | 2010-04-23 | 2013-01-04 | Peugeot Citroen Automobiles Sa | PROCESS FOR MAKING A MECHANICAL PART COMPRISING COMPLEX AND EVOLUTIVE FORMS, IN PARTICULAR A VEHICLE CULASSE |
| FR2960457B1 (en) * | 2010-05-28 | 2012-07-20 | Peugeot Citroen Automobiles Sa | ASSEMBLY OF STRATES, MOLD, METHODS OF MAKING THIS MODEL AND MANUFACTURING A WORKPIECE THEREOF |
| FR3021567B1 (en) | 2014-05-27 | 2016-05-27 | Peugeot Citroen Automobiles Sa | METHOD FOR MAKING A LOST MODEL FOR USE IN FOUNDRIES |
| CN115703945A (en) * | 2021-08-16 | 2023-02-17 | 长春理工大学 | Method for preparing adhesive coating based on demulsification induction rapid curing technology |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2681002B1 (en) * | 1991-09-09 | 1994-01-21 | Mousserolles Fonderies Ateliers | PROCESS FOR BONDING HALF SHELLS IN EXPANDED POLYSTYRENE FOR FOUNDRY MOLDING OF THE LOST MODEL TYPE. |
| DE4213169C2 (en) * | 1992-04-22 | 1994-02-24 | Albert Common Modellbau Gmbh | Device for gluing a pre-expanded model for a casting process |
-
1997
- 1997-09-10 FR FR9711220A patent/FR2768068B1/en not_active Expired - Fee Related
-
1998
- 1998-09-09 EP EP19980402219 patent/EP0901850B1/en not_active Expired - Lifetime
- 1998-09-09 ES ES98402219T patent/ES2194286T3/en not_active Expired - Lifetime
- 1998-09-09 DE DE69814770T patent/DE69814770T2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| FR2768068B1 (en) | 1999-10-08 |
| FR2768068A1 (en) | 1999-03-12 |
| EP0901850A1 (en) | 1999-03-17 |
| ES2194286T3 (en) | 2003-11-16 |
| DE69814770D1 (en) | 2003-06-26 |
| DE69814770T2 (en) | 2004-03-18 |
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