EP0497682A1 - Process for making complicated cores of ceramic material for foundry purposes - Google Patents
Process for making complicated cores of ceramic material for foundry purposes Download PDFInfo
- Publication number
- EP0497682A1 EP0497682A1 EP92400210A EP92400210A EP0497682A1 EP 0497682 A1 EP0497682 A1 EP 0497682A1 EP 92400210 A EP92400210 A EP 92400210A EP 92400210 A EP92400210 A EP 92400210A EP 0497682 A1 EP0497682 A1 EP 0497682A1
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- EP
- European Patent Office
- Prior art keywords
- core
- degradable
- injection
- injections
- recesses
- 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
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/342—Moulds, cores, or mandrels of special material, e.g. destructible materials which are at least partially destroyed, e.g. broken, molten, before demoulding; Moulding surfaces or spaces shaped by, or in, the ground, or sand or soil, whether bound or not; Cores consisting at least mainly of sand or soil, whether bound or not
Definitions
- the present invention relates to a method for producing a complex ceramic core for foundries, of the type having a solid part made of ceramic material and recesses which extend inside said core, said core being intended for the manufacture of a hollow part comprising internal cavities and partitions, in particular a turbomachine blade, by the known foundry method known as lost wax.
- a ceramic material core is used which is held in the mold during metal casting, the outer surface of the core forming the inner surface of an internal cavity of the finished product obtained from this way.
- the core used must have recesses so as to form partitions in the finished product. This is the case, among others, of the cores used in the manufacture of hollow turbomachine blades, said hollow blades having, in their internal cavity, partitions for delimiting channels for the circulation of cooling fluids, and possibly fins for the cooling of the outer walls of the blades.
- British patent GB 2,090,181 teaches a process for manufacturing hollow blades of a turbomachine, comprising an internal partition. According to this method, a partition is made in a degradable material by a first injection of degradable material in a suitable mold, the shape of the partition is made in degradable material by an injection of a ceramic-based composition in a second mold. , and the degradable material is removed by a removal process depending on the degradable material used.
- this partition made of degradable material has a thin wall. This fineness can lead to problems during the demolding of the partition of degradable material and can especially deform or break during its overmolding in the second mold due to the pressures exerted on both sides of the thin wall of degradable material which does not '' do not necessarily balance during the second injection phase. This can lead to an internal malformation of the foundry core and, by the same token, a malformation of the blade made using this core.
- the object of the present invention is to provide a method for producing cores of the type mentioned which overcomes these drawbacks.
- the invention achieves its object by the fact that said full body is produced by successive and superimposed injections, in at least one suitable mold, of at least two compositions, one of which is degradable without harming the other. or to the others, the first injection making it possible to create a blank made up of one or the other of said compositions, and the following successive injections making it possible to cover, at least in part, the external surface of the blank obtained in the injection above, a layer of material consisting of the injected composition.
- the blank enlarges as the successive layers are stacked.
- the shapes of the various successively obtained blanks can be studied so that there is no problem with demolding due to undercuts.
- the shape of the recesses filled with degradable material can be as complex as desired.
- the walls constituting this second body part can be extremely thin, and there is no risk of deformation of these thin walls during demolding or overmolding.
- the same mold is used for all of the superimposed injections and appropriate inserts are introduced into the mold to define the molding imprint on each injection.
- FIG. 1 schematically represents a hollow vane 1 of a turbomachine which has an external wall 2 and an internal cavity 3.
- the internal cavity 3 comprises partitions 4 which divide it into several channels 3a, 3b in which coolants circulate, or which act as cooling fins.
- the partitions 4 and the external wall 2 may also have openings for the passage of the coolants from one channel to another, or for the discharge of the coolants.
- This blade 1 is produced in a foundry by the known process known as lost wax.
- This known method consists in casting a metal in a mold containing a core 5 of ceramic material.
- the core 5 which, at the end of the casting, is embedded inside the blade 1, is then removed by any suitable method.
- the core 5 also has a complex configuration. It has a solid part 6 of ceramic material which is intended to form the internal cavities of the blade 1 and of the recesses 7 which extend inside the solid part 6. These recesses 7 are intended to give rise to the walls 4 of the blade 1 during the casting of the metal.
- FIG. 2 shows the core 5 which makes it possible to obtain the blade shown in FIG. 1 by casting.
- a solid body 8 formed by said core 5 is made beforehand in which the recesses 7 are filled with a degradable material. This solid body 8 is shown in FIG. 3.
- the solid body 8 is produced by superimposed injections, preferably in the same mold, of at least two types of composition, one of which is degradable, and the other of which comprises a first binder and a ceramic filler.
- the degradable composition consists of a second binder and a degradable filler.
- This degradable filler can for example be graphite which decomposes under the action of heat in an appropriate atmosphere.
- the solid body 8 has three parts: a part 9 corresponding to the cavity 3a of the blade 1, a part 10 corresponding to the partition 4 and the part 11 corresponding to the cavity 3b.
- Part 9 is produced by injecting the composition of ceramic material into a mold shaped at dawn 1 into which is introduced a first insert corresponding to parts 10 and 11. This first injection makes it possible to create a blank conformed to part 9. After opening the mold, the first insert is replaced by a second smaller insert conforming to the part 11 of the solid body 8, while leaving the blank obtained previously in the mold, then an injection of the degradable composition is carried out into the volume corresponding to part 10. The second insert is then removed from the mold, and a second injection of ceramic material is carried out so as to form part 11 of the full body 8.
- the parts 11 and 9 are locally welded at their junction surface represented in FIG. 3 by the reference 12.
- the solid body 8 is obtained by three successive injections. It is obvious that the number of injections is a function of the complexity of the core 5 which it is desired to obtain by the method of the invention. Similarly, the order of injection of parts 9, 10 and 11 can be reversed.
- Part 10 is linked to part 9 when the composition of degradable material is injected. It does not undergo degradation during the second demolding or deformation during the second injection of the composition of ceramic material. Its volume and thickness are a function of the imprints of the various inserts.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Producing Shaped Articles From Materials (AREA)
Abstract
Description
La présente invention concerne un procédé de réalisation d'un noyau complexe en céramique pour fonderie, du type présentant une partie pleine en matériau céramique et des évidements qui s'étendent à l'intérieur dudit noyau, ledit noyau étant destiné à la fabrication d'une pièce creuse comportant des cavités internes et des cloisons, notamment une aube de turbomachine, par la méthode de fonderie connue dite à la cire perdue.The present invention relates to a method for producing a complex ceramic core for foundries, of the type having a solid part made of ceramic material and recesses which extend inside said core, said core being intended for the manufacture of a hollow part comprising internal cavities and partitions, in particular a turbomachine blade, by the known foundry method known as lost wax.
Dans la méthode de fonderie dite à la cire perdue, on utilise un noyau en matériau céramique qui est tenu dans le moule lors de la coulée de métal, la surface extérieure du noyau formant la surface intérieure d'une cavité interne du produit fini obtenu de cette façon.In the lost wax casting method, a ceramic material core is used which is held in the mold during metal casting, the outer surface of the core forming the inner surface of an internal cavity of the finished product obtained from this way.
Dans certains cas le noyau utilisé doit présenter des évidements de manière à former des cloisons dans le produit fini. C'est le cas, entre autres, des noyaux utilisés dans la fabrication des aubes creuses de turbomachine, lesdites aubes creuses présentant, dans leur cavité interne, des cloisons pour délimiter des canaux de circulation des fluides de refroidissement, et éventuellement des ailettes pour le refroidissement des parois extérieures des aubes.In some cases the core used must have recesses so as to form partitions in the finished product. This is the case, among others, of the cores used in the manufacture of hollow turbomachine blades, said hollow blades having, in their internal cavity, partitions for delimiting channels for the circulation of cooling fluids, and possibly fins for the cooling of the outer walls of the blades.
Pour réaliser ces noyaux il a déjà été proposé de réaliser un corps plein formé par ledit noyau dans lequel les évidements sont remplis par un matériau dégradable, et d'éliminer la composition dégradable remplissant lesdits évidements. Le brevet anglais GB 2 090 181 enseigne un procédé de fabrication d'aubes creuses de turbomachine, comportant une cloison interne. Selon ce procédé on réalise une forme de cloison dans un matériau dégradable par une première injection de matériau dégradable dans un moule approprié, on surmoule la forme de la cloison en matériau dégradable par une injection d'une composition à base de céramique dans un deuxième moule, et on élimine le matériau dégradable par un procédé d'élimination en fonction du matériau dégradable utilisé.To produce these cores, it has already been proposed to produce a solid body formed by said core in which the recesses are filled with a degradable material, and to eliminate the degradable composition filling said recesses. British patent GB 2,090,181 teaches a process for manufacturing hollow blades of a turbomachine, comprising an internal partition. According to this method, a partition is made in a degradable material by a first injection of degradable material in a suitable mold, the shape of the partition is made in degradable material by an injection of a ceramic-based composition in a second mold. , and the degradable material is removed by a removal process depending on the degradable material used.
Le procédé décrit dans ce brevet anglais présente quelques inconvénients et des limites d'utilisation. Tout d'abord cette cloison en matériau dégradable comporte une paroi fine. Cette finesse peut entraîner des problèmes lors du démoulage de la cloison en matériau dégradable et peut surtout se déformer ou se rompre lors de son surmoulage dans le deuxième moule par suite des pressions exercées sur les deux faces de la paroi fine en matériau dégradable qui ne s'équilibrent pas forcément lors de la deuxième phase d'injection. Ceci peut entraîner une malformation interne du noyau de fonderie et par le fait même, une malformation de l'aube réalisée à l'aide de ce noyau. Enfin, il est difficile de réaliser lors de la première injection un corps complexe comportant une pluralité de parois fines en matériau dégradable liées entre elles, par suite de contre-dépouilles qui rendent impossible le démoulage de ce corps complexe en matériau dégradable. C'est la raison pour laquelle les aubes de turbomachine qui comportent un réseau interne complexe de cloisons, ne sont pas réalisées en totalité par le procédé de fonderie dit à la cire perdue. Les cloisons sont réalisées par brasage de chemises à l'intérieur de l'aube creuse. Ceci entraîne des coûts de main d'oeuvre, des altérations éventuelles du métal et des difficultés pour assurer l'étanchéité des parois.The process described in this English patent has some drawbacks and limits of use. First of all, this partition made of degradable material has a thin wall. This fineness can lead to problems during the demolding of the partition of degradable material and can especially deform or break during its overmolding in the second mold due to the pressures exerted on both sides of the thin wall of degradable material which does not '' do not necessarily balance during the second injection phase. This can lead to an internal malformation of the foundry core and, by the same token, a malformation of the blade made using this core. Finally, it is difficult to produce during the first injection a complex body comprising a plurality of thin walls of degradable material linked together, as a result of undercuts which make it impossible to demold this complex body of degradable material. This is the reason why the turbomachine blades, which comprise a complex internal network of partitions, are not produced entirely by the foundry process known as lost wax. The partitions are produced by brazing shirts inside the hollow vane. This leads to labor costs, possible alterations to the metal and difficulties in ensuring the sealing of the walls.
Le but de la présente invention est de proposer un procédé pour réaliser des noyaux du type mentionné qui pallie ces inconvénients.The object of the present invention is to provide a method for producing cores of the type mentioned which overcomes these drawbacks.
L'invention atteint son but par le fait que l'on réalise ledit corps plein par injections successives et superposées, dans au moins un moule approprié, d'au moins deux compositions dont l'une est dégradable sans que cela nuise à l'autre ou aux autres, la première injection permettant de créer une ébauche constituée de l'une ou l'autre desdites compositions, et les injections successives suivantes permettant de recouvrir, au moins en partie, la surface externe de l'ébauche obtenue dans l'injection précédente, d'une couche de matière constituée par la composition injectée.The invention achieves its object by the fact that said full body is produced by successive and superimposed injections, in at least one suitable mold, of at least two compositions, one of which is degradable without harming the other. or to the others, the first injection making it possible to create a blank made up of one or the other of said compositions, and the following successive injections making it possible to cover, at least in part, the external surface of the blank obtained in the injection above, a layer of material consisting of the injected composition.
Grâce à cette technique, l'ébauche grossit au fur et à mesure de l'empilage des couches successives. Les formes des diverses ébauches obtenues successivement peuvent être étudiées pour qu'il n'y ait pas de problème au démoulage par suite de contre-dépouilles. La forme des évidements remplis de matériau dégradable peut être aussi complexe que l'on veut. Les parois constituant cette deuxième partie de corps peuvent être extrêmement fines, et il n'y a pas de risque de déformation de ces parois fines au démoulage ni au surmoulage.Thanks to this technique, the blank enlarges as the successive layers are stacked. The shapes of the various successively obtained blanks can be studied so that there is no problem with demolding due to undercuts. The shape of the recesses filled with degradable material can be as complex as desired. The walls constituting this second body part can be extremely thin, and there is no risk of deformation of these thin walls during demolding or overmolding.
De préférence on utilise le même moule pour toutes les injections superposées et on introduit dans le moule des inserts appropriés pour définir l'empreinte de moulage à chaque injection.Preferably, the same mold is used for all of the superimposed injections and appropriate inserts are introduced into the mold to define the molding imprint on each injection.
D'autres avantages et caractéristiques de l'invention ressortiront à la lecture de la description suivante faite à titre d'exemple et en référence au dessin annexé dans lequel :
- la figure 1 représente une coupe d'une aube de turbomachine obtenue par coulée,
- la figure 2 montre en perspective un noyau en céramique permettant de réaliser l'aube représentée à la figure 1, et
- la figure 3 montre en perspective le corps plein obtenu par des injections successives selon l'invention et permettant de réaliser le noyau de la figure 2.
- FIG. 1 represents a section of a turbomachine blade obtained by casting,
- FIG. 2 shows in perspective a ceramic core enabling the blade shown in FIG. 1 to be produced, and
- FIG. 3 shows in perspective the solid body obtained by successive injections according to the invention and making it possible to produce the core of FIG. 2.
La figure 1 représente schématiquement une aube creuse 1 de turbomachine qui présente une paroi externe 2 et une cavité interne 3. La cavité interne 3 comporte des cloisons 4 qui la partagent en plusieurs canaux 3a, 3b dans lesquels circulent des fluides de refroidissement, ou qui jouent le rôle d'ailettes de refroidissement. Les cloisons 4 et la paroi externe 2 peuvent de plus présenter des ouvertures pour le passage des fluides de refroidissement d'un canal à un autre, ou pour l'évacuation des fluides de refroidissement.FIG. 1 schematically represents a
Cette aube 1 est réalisée en fonderie par le procédé connu dit à la cire perdue. Ce procédé connu consiste à couler un métal dans un moule contenant un noyau 5 en matériau céramique.This
Le noyau 5 qui, à la fin de la coulée, est noyé à l'intérieur de l'aube 1, est ensuite éliminé par tout procédé approprié.The
L'ensemble des cloisons 4 situées à l'intérieur de l'aube 1 peut présenter une configuration complexe. Par le fait même le noyau 5 a également une configuration complexe. Il présente une partie pleine 6 en matériau céramique qui est destiné à former les cavités internes de l'aube 1 et des évidemements 7 qui s'étendent à l'intérieur de la partie pleine 6. Ces évidements 7 sont destinés à donner naissance aux parois 4 de l'aube 1 lors de la coulée du métal. La figure 2 montre le noyau 5 qui permet d'obtenir par coulée l'aube présentée sur la figure 1.All the partitions 4 located inside the
De manière connue, on réalise au préalable un corps plein 8 formé par ledit noyau 5 dans lequel les évidements 7 sont remplis par un matériau dégradable. Ce corps plein 8 est représenté sur la figure 3.In known manner, a solid body 8 formed by said
Selon l'invention on réalise le corps plein 8 par des injections superposées, de préférence dans le même moule, d'au moins deux types de composition dont l'une est dégradable, et dont l'autre comporte un premier liant et une charge céramique traditionnelle pour noyau de fonderie. La composition dégradable est constituée d'un deuxième liant et d'une charge dégradable. Cette charge dégradable peut être par exemple du graphite qui se décompose sous l'action de la chaleur en atmosphère appropriée.According to the invention, the solid body 8 is produced by superimposed injections, preferably in the same mold, of at least two types of composition, one of which is degradable, and the other of which comprises a first binder and a ceramic filler. traditional for foundry core. The degradable composition consists of a second binder and a degradable filler. This degradable filler can for example be graphite which decomposes under the action of heat in an appropriate atmosphere.
Comme on le voit sur la figure 3, le corps plein 8 comporte trois parties : une partie 9 correspondant à la cavité 3a de l'aube 1, une partie 10 correspondant à la cloison 4 et la partie 11 correspondant à la cavité 3b.As can be seen in FIG. 3, the solid body 8 has three parts: a part 9 corresponding to the
La partie 9 est réalisée en injectant la composition de matériau céramique dans un moule conformé à l'aube 1 dans laquelle est introduite un premier insert correspondant aux parties 10 et 11. Cette première injection permet de créer une ébauche conformée à la partie 9. Après ouverture du moule, on remplace le premier insert par un deuxième insert plus petit conformé à la partie 11 du corps plein 8, tout en laissant l'ébauche obtenue précédemment dans le moule, puis on procède à une injection de la composition dégradable dans le volume correspondant à la partie 10. On sort ensuite le deuxième insert du moule, et on procède à une deuxième injection de matériau céramique de manière à former la partie 11 du corps plein 8. Les parties 11 et 9 se soudent localement au niveau de leur surface de jonction représentée sur la figure 3 par la référence 12.Part 9 is produced by injecting the composition of ceramic material into a mold shaped at
Il ne reste plus qu'à cuire le noyeau céramique et éliminer la composition dégradable par chauffage sous atmosphère appropriée pour obtenir le noyau 5 représenté sur la figure 2.It only remains to bake the ceramic core and remove the degradable composition by heating under an appropriate atmosphere to obtain the
Dans l'exemple décrit ci-dessus, le corps plein 8 est obtenu par trois injections successives. Il est évident que le nombre d'injections est fonction de la complexité du noyau 5 que l'on désire obtenir par le procédé de l'invention. De même l'ordre de l'injection des parties 9, 10 et 11 peut être inversé.In the example described above, the solid body 8 is obtained by three successive injections. It is obvious that the number of injections is a function of the complexity of the
La partie 10 est liée à la partie 9 au moment de l'injection de la composition en matériau dégradable. Elle ne subit pas de dégradation lors du deuxième démoulage ni de déformation lors de la deuxième injection de la composition en matériau céramique. Son volume et son épaisseur sont fonction des empreintes des différents inserts.
Claims (2)
procédé selon lequel on réalise au préalable un corps plein (8) formé par ledit noyau (5) dans lequel les évidements (7) sont remplis par un matériau dégradable, et on élimine la composition dégradable remplissant lesdits évidements (7) pour obtenir ledit noyeau complexe (5)
ledit procédé étant caractérisé en ce qu'on réalise ledit corps plein (8) par injections successives et superposées, dans au moins un moule approprié, d'au moins deux compositions dont l'une est dégradable sans que cela nuise à l'autre ou aux autres, la première injection permettant de créer une ébauche (9) constituée de l'une ou l'autre desdites compositions, et les injections successives suivantes permettant de recouvrir, au moins en partie, la surface externe de l'ébauche (9) obtenue dans l'injection précédente, d'une couche de matière (10) constituée par la composition injectée.Method for producing a complex ceramic core (5) for foundries, of the type having recesses (7) which extend inside said core (5), said core (5) being intended for the manufacture of a hollow part comprising internal cavities and partitions, in particular a turbomachine blade, by the known casting method known as lost wax,
method according to which a solid body (8) formed by said core (5) is produced beforehand in which the recesses (7) are filled with a degradable material, and the degradable composition filling said recesses (7) is eliminated in order to obtain said core complex (5)
said method being characterized in that said solid body (8) is produced by successive and superimposed injections, in at least one suitable mold, of at least two compositions, one of which is degradable without this harming the other or to the others, the first injection making it possible to create a blank (9) consisting of one or the other of said compositions, and the following successive injections making it possible to cover, at least in part, the external surface of the blank (9) obtained in the previous injection, a layer of material (10) consisting of the injected composition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9101022 | 1991-01-30 | ||
| FR9101022A FR2672003B1 (en) | 1991-01-30 | 1991-01-30 | PROCESS FOR PRODUCING COMPLEX CERAMIC CORES FOR FOUNDRY. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0497682A1 true EP0497682A1 (en) | 1992-08-05 |
| EP0497682B1 EP0497682B1 (en) | 1994-10-26 |
Family
ID=9409185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92400210A Expired - Lifetime EP0497682B1 (en) | 1991-01-30 | 1992-01-28 | Process for making complicated cores of ceramic material for foundry purposes |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5249618A (en) |
| EP (1) | EP0497682B1 (en) |
| JP (1) | JP2563717B2 (en) |
| DE (1) | DE69200546T2 (en) |
| FR (1) | FR2672003B1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0647492A1 (en) * | 1993-09-28 | 1995-04-12 | Fischerwerke Arthur Fischer GmbH & Co. KG | Process for preparing nestable parts |
| US5498132A (en) * | 1992-01-17 | 1996-03-12 | Howmet Corporation | Improved hollow cast products such as gas-cooled gas turbine engine blades |
| EP1930099A1 (en) * | 2006-12-06 | 2008-06-11 | General Electric Company | Disposable insert, and use thereof in a method for manufactoring an airfoil |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1106280B1 (en) | 1999-12-08 | 2007-03-07 | General Electric Company | Core to control turbine bucket wall thickness and method |
| US6547210B1 (en) | 2000-02-17 | 2003-04-15 | Wright Medical Technology, Inc. | Sacrificial insert for injection molding |
| US6403020B1 (en) | 2001-08-07 | 2002-06-11 | Howmet Research Corporation | Method for firing ceramic cores |
| DE10153719B4 (en) * | 2001-10-31 | 2005-07-28 | Siempelkamp Giesserei Gmbh & Co. Kg | Method for casting bores in thick-walled castings and a suitable casting core |
| WO2010151833A2 (en) * | 2009-06-26 | 2010-12-29 | Havasu | Methods and apparatus for manufacturing metal components with ceramic injection molding core structures |
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| FR90962E (en) * | 1961-11-07 | 1968-03-22 | Howe Sound Co | Method and device for the production of core models |
| FR2368323A1 (en) * | 1976-10-19 | 1978-05-19 | Deere & Co | LOST CORE SHAPED IN SEVERAL PARTS FOR MOLDS FOR CASTING METALS AND PROCESS FOR ITS PRODUCTION |
| GB2090181A (en) * | 1977-07-22 | 1982-07-07 | Rolls Royce | Manufacturing a Blade or Vane for a Gas Turbine Engine |
| EP0092690A1 (en) * | 1982-04-22 | 1983-11-02 | Nissan Motor Co., Ltd. | Molding core for casting engine cylinder block |
| US4922991A (en) * | 1986-09-03 | 1990-05-08 | Ashland Oil, Inc. | Composite core assembly for metal casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2906495A (en) * | 1955-04-29 | 1959-09-29 | Eugene F Schum | Turbine blade with corrugated strut |
| US2977089A (en) * | 1956-06-12 | 1961-03-28 | Daniel J Mccarty | Heat responsive means for blade cooling |
| JPS5848702A (en) * | 1981-09-18 | 1983-03-22 | Hitachi Ltd | Air cooled vane in gas turbine |
| GB2107405B (en) * | 1981-10-13 | 1985-08-14 | Rolls Royce | Nozzle guide vane for a gas turbine engine |
| GB2159585B (en) * | 1984-05-24 | 1989-02-08 | Gen Electric | Turbine blade |
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1991
- 1991-01-30 FR FR9101022A patent/FR2672003B1/en not_active Expired - Fee Related
-
1992
- 1992-01-28 DE DE69200546T patent/DE69200546T2/en not_active Expired - Lifetime
- 1992-01-28 EP EP92400210A patent/EP0497682B1/en not_active Expired - Lifetime
- 1992-01-29 US US07/827,607 patent/US5249618A/en not_active Expired - Lifetime
- 1992-01-30 JP JP4040112A patent/JP2563717B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR90962E (en) * | 1961-11-07 | 1968-03-22 | Howe Sound Co | Method and device for the production of core models |
| FR2368323A1 (en) * | 1976-10-19 | 1978-05-19 | Deere & Co | LOST CORE SHAPED IN SEVERAL PARTS FOR MOLDS FOR CASTING METALS AND PROCESS FOR ITS PRODUCTION |
| GB2090181A (en) * | 1977-07-22 | 1982-07-07 | Rolls Royce | Manufacturing a Blade or Vane for a Gas Turbine Engine |
| EP0092690A1 (en) * | 1982-04-22 | 1983-11-02 | Nissan Motor Co., Ltd. | Molding core for casting engine cylinder block |
| US4922991A (en) * | 1986-09-03 | 1990-05-08 | Ashland Oil, Inc. | Composite core assembly for metal casting |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5498132A (en) * | 1992-01-17 | 1996-03-12 | Howmet Corporation | Improved hollow cast products such as gas-cooled gas turbine engine blades |
| EP0715913A1 (en) * | 1992-02-05 | 1996-06-12 | Howmet Corporation | Multiple part cores for investment casting |
| EP0647492A1 (en) * | 1993-09-28 | 1995-04-12 | Fischerwerke Arthur Fischer GmbH & Co. KG | Process for preparing nestable parts |
| EP1930099A1 (en) * | 2006-12-06 | 2008-06-11 | General Electric Company | Disposable insert, and use thereof in a method for manufactoring an airfoil |
| US7624787B2 (en) | 2006-12-06 | 2009-12-01 | General Electric Company | Disposable insert, and use thereof in a method for manufacturing an airfoil |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69200546D1 (en) | 1994-12-01 |
| US5249618A (en) | 1993-10-05 |
| FR2672003A1 (en) | 1992-07-31 |
| JP2563717B2 (en) | 1996-12-18 |
| JPH05138295A (en) | 1993-06-01 |
| EP0497682B1 (en) | 1994-10-26 |
| FR2672003B1 (en) | 1993-04-09 |
| DE69200546T2 (en) | 1995-03-23 |
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