EP3395471A1 - Core for the fabrication of a turbine engine blade - Google Patents

Core for the fabrication of a turbine engine blade Download PDF

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Publication number
EP3395471A1
EP3395471A1 EP18168395.4A EP18168395A EP3395471A1 EP 3395471 A1 EP3395471 A1 EP 3395471A1 EP 18168395 A EP18168395 A EP 18168395A EP 3395471 A1 EP3395471 A1 EP 3395471A1
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EP
European Patent Office
Prior art keywords
core
groove
functional part
rod
secondary element
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
Application number
EP18168395.4A
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German (de)
French (fr)
Other versions
EP3395471B1 (en
Inventor
Daniel Quach
Pascal Francis Patrick Gomez
Coralie Cinthia GUERARD
Jean-Claude Marcel Auguste Hanny
Patrick Emilien Paul Emile Huchin
Joseph Toussaint TAMI LIZUZU
Matthieu Jean Luc VOLLEBREGT
Vincent Marc HERB
Laetitia PERSON
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Safran Aircraft Engines SAS
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Safran Aircraft Engines SAS
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Publication of EP3395471A1 publication Critical patent/EP3395471A1/en
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Classifications

    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/14—Form or construction
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/20—Manufacture essentially without removing material
    • F05D2230/21—Manufacture essentially without removing material by casting
    • F05D2230/211—Manufacture essentially without removing material by casting by precision casting, e.g. microfusing or investment casting

Definitions

  • the present invention relates to the field of turbomachine blades, in particular the blades obtained by casting a molten alloy in a mold according to the lost wax casting technique.
  • the lost-wax foundry technique consists first and foremost in producing a wax model, or any other easily removable material, of the part to be produced; this model includes an internal part forming a ceramic core which shows the cavities that one wishes to appear inside the vane.
  • the wax model is then soaked several times in slips consisting of a suspension of ceramic particles for making, by so-called stuccoing and drying operations, a shell mold.
  • the carapace mold is then dewaxed, which is an operation by which the wax or the material constituting the original model is removed from the shell. After this elimination, a ceramic mold is obtained, the cavity of which reproduces all the shapes of the blade and which still contains the ceramic core intended to generate the internal cavities thereof. The mold then undergoes heat treatment at high temperature or "cooking" which gives it the necessary mechanical properties.
  • the shell mold is then ready for the manufacture of the metal part by casting.
  • the next step is to cast a molten metal, which occupies the voids between the inner wall of the shell mold and the core, and to solidify it.
  • a molten metal which occupies the voids between the inner wall of the shell mold and the core.
  • solidification techniques there are currently several solidification techniques, and therefore several casting techniques, depending on the nature of the alloy and the expected properties of the part resulting from the casting. It may be directed solidification with columnar structure (DS), directed solidification with monocrystalline structure (SX) or equiaxed solidification (EX).
  • the casting of the alloy After the casting of the alloy, it breaks the shell by a shake operation. In another step, the ceramic core which has remained enclosed in the blade obtained is chemically removed. The metal blade obtained then undergoes finishing operations that make it possible to obtain the finished part.
  • a tool or wax injection mold, in which the core is placed and then the liquid wax is injected by a channel provided for this purpose.
  • the core Due to the complexity of the cooling cavities to be formed with their partition walls, and their arrangement, the core is made in several parts that are assembled and glued. Elemental nuclei are usually linked together at the foot and the summit. It is in fact to control the thickness of the walls and partitions formed at the time of casting. The assembly must allow the core to withstand the stresses experienced during the steps of wax injection, dewaxing and casting.
  • the maintenance of the various parts of the core as proposed in the present art consists in firmly connecting these parts or elements of cores to the ceramic shell. If such a maintenance allows in theory to to guarantee a precise relative positioning of the various elements of the core, it is observed that the molten metal casting leads to a significant thermal expansion of the elements of the nucleus inducing, because of a static fixation of the constituent elements of the core with respect to other to deformations of some of these elements, which contributes to increase the scrap rate of the blades. In critical cases, one of the elements of the nucleus can even break, obviously leading to the rejection of the dawn obtained but also to making a new core, which is expensive and time consuming.
  • the invention aims in particular to provide a simple, effective and economical solution to the problems of the prior art described above.
  • a core used for the lost wax casting of a turbomachine blade extending in a longitudinal direction between a foot and a head and comprising a main element and at least a first secondary element. each comprising a functional part and a non-functional part, characterized in that the non-functional part of the main element and the non-functional part of said at least one secondary element are assembled and shaped so as to cooperate in sliding one with the other in the longitudinal direction and in rotation about this longitudinal direction.
  • connection of the main element and the first secondary element of the core allows relative displacement by longitudinal sliding and rotation of the core elements relative to each other. More particularly, when the main element is fixed in the ceramic shell, the first secondary core can expand longitudinally and in rotation in its non-functional part. Thus, it is possible to limit deformations and kernel breaks, which reduces the scrap rate of the blades at the end of a lost wax casting operation.
  • non-functional parts of the core elements avoids modifying the functional parts of the core. Indeed, the sizing of these functional parts is difficult to achieve and a modification of their shapes for reasons other than those in relation to the final shape of the blade is not desirable.
  • the non-functional portions are formed at a longitudinal end of the core, preferably at the foot of the core.
  • a non-functional part refers to an area of a kernel element that has no impact on the final geometry of the part.
  • the longitudinal direction corresponds to a direction extending from the root of the blade to the top of the blade, this longitudinal direction being substantially perpendicular to the axis of rotation of the turbomachine.
  • the sliding is a linear slip, that is to say along a line, more specifically a straight line, the slip then being linear straight.
  • the main element of the core and the first secondary element of the core are thus positioned and guided in displacement relative to each other at the level of the foot along a straight line of the first secondary element sliding on a plane of the main element. .
  • This also makes it possible to have an isostatic and non-hyperstatic positioning of the first secondary element on the main element.
  • the linear sliding mode differs from a sliding of a surface on another surface, avoiding excessive mechanical stresses on the first secondary element and the main element and cause buckling, the deformation or even a break of the elements of the nucleus.
  • a set of expansion may be provided between the shell mold and the first secondary element.
  • This expansion set can be achieved by interposing a film of varnish between the first secondary element and a boss of the shell mold. It will be understood that during the dewaxing and baking operation of the shell mold, the film of varnish will be eliminated, giving rise to the formation of a free space forming a clearance between the first secondary element and the shell mold.
  • the combination of the expansion clearance and the aforementioned linear guide greatly limits the risk of kernel breakage, thus making it possible to optimize the blade manufacturing process.
  • Said non-functional part of said at least one secondary element may comprise a rod engaged in sliding in a first groove of the non-functional part of the main element. Linear linear guidance can then be performed at the contact zone of the rod with the bottom of the groove. The lacquer film is then deposited on a portion of the face of the rod arranged opposite the bottom of the first groove.
  • the first groove may comprise two lateral flanks moving away from each other towards the outlet of the first groove.
  • the use of such flanks facilitates the centering of the rod in the groove.
  • the linear support can be done with a groove bottom surface which is flat.
  • the core comprises a second secondary member of which a non-functional portion comprises a rod engaged in longitudinal sliding in a second groove of the non-functional part of the main element.
  • the stem of the first secondary element and the rod of the second secondary element are for example arranged symmetrically with each other with respect to a straight line extending longitudinally, the first groove and the second groove opening in opposite directions in one direction. perpendicular to the longitudinal direction.
  • It also relates to a method of manufacturing a blade by means of a core as described above, in which the non-functional part of the main element of the core is retained in a wax injection mold by a means anchoring on a wall of the mold.
  • FIG 1 representing a lower end of a core 10 according to the invention comprising a main element 12 and two secondary elements, namely a first secondary element 14 and a second secondary element 16.
  • the non-functional parts of the constituent elements of the core 10 are represented, these non-functional parts being arranged at a longitudinal end of the core 10 (double arrow L).
  • a non-functional part of the core 10 is a part not participating in the final geometry of the part during the lost wax casting process.
  • the core 10 extends in three directions perpendicular two by two, a longitudinal direction L corresponding to the final blade in the longitudinal direction L connecting the foot to the top of the blade, an axial direction A ( figure 1 ) corresponding on the final dawn to the upstream / downstream direction and a transverse direction T passing through the intrados and extrados faces of the dawn ( figure 3 ).
  • the core comprises a head 17 on the figure 1 and a foot 11 which is alone represented on the figure 1 .
  • the main element 12 of the core 10 is intended to form in its functional part (not shown) a central cavity of the blade and the first and second secondary elements 14, 16 are intended to form in their functional parts (not shown) cavities in the intrados and extrados walls of the dawn.
  • the non-functional part of the first secondary element 14 comprises a rod or finger 18 extending substantially longitudinally and which is housed in a first groove 20 or substantially longitudinal notch of the non-functional part of the main element 12 ( Figures 1 and 2 ).
  • the second secondary element 16 comprises in its non-functional part a rod 22 extending substantially longitudinally and which is housed in a second groove 24 or notch substantially longitudinal of the non-functional part of the main element 12 ( Figures 1 and 2 ).
  • the invention also covers the embodiments in which the main element 12 of the core 10 comprises only one groove associated with a single secondary element of the core.
  • first groove 20 and the second groove 24 open in opposite directions in a perpendicular direction (double arrow T) to the longitudinal direction L, that is to say in the transverse direction T.
  • the rod 18 of the first secondary element 12 and the rod 22 of the second secondary element 16 are symmetrical to one another with respect to a straight line D extending longitudinally L.
  • the first groove 20 and the second groove 24 are separated from one another by a web 26 of material of the main element 12 of the core, this web 26 being inclined obliquely with respect to a first plane containing the longitudinal direction L and the transverse direction T and a second plane containing the longitudinal direction L and the axial direction A.
  • the rod 18 of the first secondary element 14 is slidably mounted in the first groove 20 of the main element 12 of the core 10 just as the rod 22 of the second secondary element 16 is slidably mounted in the second groove 24 of the main element 12 of the core 10.
  • each of the grooves 20, 24 is shaped to allow a degree of freedom in rotation of the rods 18, 22 about the longitudinal axis L.
  • the rods 18, 22 have a circular shape and the bottom 28 of the grooves 20, 22 is plane so that the contact between a rod 18, 22 and the bottom 28 of a groove 20, 24 is a straight linear contact, which allows guiding in a rectilinear support of the first secondary element of the core and the second secondary element of the core on the main element of the core without hyperstatic connection. In this way the friction of the three parts of the core on each other is strongly limited and allows the relative expansions.
  • each rod 18, 22 is dimensioned so that its diameter is flush with the outlet plane 30 of the groove 20, 24 in which it is engaged.
  • each rod 18, 22 is dimensioned so that its diameter is flush with the outlet plane 30 of the groove 20, 24 in which it is engaged.
  • Each groove 20, 24 comprises two opposite sides 34, 36 connected to each other by the bottom wall 28 flat.
  • the two flanks 34, 36 of each groove 20, 24 move away from each other towards the outlet of the groove 20, 24.
  • the width of the groove 20, 24 measured at the bottom wall 28 is smaller than the diameter of the rod 18, 22.
  • the shell mold comprises a first internal boss 38 formed on an inner face of the mold 40 and positioned so as to clamp the rod 18 of the first secondary element 14 of the core 10 in the first notch 20 of the main element 12 of the core 10.
  • the mold 40 comprises a second internal boss (not shown) formed on an inner face of the mold 40 and positioned so as to clamp the rod 22 of the second secondary element 16 of the core 10 in the second notch 24 of the element main 12 of the core 10.
  • the first 38 and second bosses are thus formed on faces facing the mold in the transverse direction T and covers the outlets of the first 20 second 24 notches. It is understood that the zone 44 separating the shell mold 40 from the core 10 comprises wax.
  • Each boss 38 comprises two longitudinal flanks 38a, 38b obliquely inclined relative to each other, converging towards one another towards the inside of the mold 40 and connected to one another by a wall 38c clamping rods 18, 22 of the first and second secondary members 14, 16 of the core 10 in the bottom of the notch 20, 24.
  • the sides 38a, 38b are inclined at an angle between 10 and 30 ° with respect to a plane containing the longitudinal direction A and the transverse direction T in the longitudinal direction and passing between the two sides 38a, 38b.
  • a film of varnish 42 is interposed between the rod 18, 22 of each of the non-functional part of the first secondary element 14 and the non-functional part of the second secondary element 16 and the wall 38c of the boss 38 facing each other. It will be understood that during the dewaxing and baking operation of the shell mold, the film 42 of varnish will be eliminated, giving rise to the formation of a free space forming a clearance between each of the first secondary element 14 and the second secondary element 22 and the carapace mold 40. This free space forms a means of sliding support of the second non-functional parts of the first 14 and second 16 secondary elements.
  • the rod 18 of the first secondary element 14 and the rod 22 of the second secondary element 16 may have a shape other than circular, for example oval, more generally concave.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • General Engineering & Computer Science (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un noyau (10) utilisé pour la fabrication par fonderie à la cire perdue d'une aube de turbomachine, comprenant un élément principal (12) et au moins un premier élément secondaire (14) comportant chacun une partie fonctionnelle et une partie non fonctionnelle. Selon l'invention, la partie non fonctionnelle de l'élément principal (12) et la partie non fonctionnelle dudit au moins un premier élément secondaire (14) sont assemblées et conformées de manière à coopérer en glissement l'une avec l'autre dans une direction longitudinale (L) s'étendant entre un pied et un sommet d'aube et à rotation autour de cette direction longitudinale (L).The invention relates to a core (10) used for the lost-wax casting of a turbomachine blade, comprising a main element (12) and at least a first secondary element (14) each having a functional part and a non-functional part. According to the invention, the non-functional part of the main element (12) and the non-functional part of the at least one first secondary element (14) are assembled and shaped so as to slide together with each other. a longitudinal direction (L) extending between a foot and a blade tip and rotated about this longitudinal direction (L).

Description

La présente invention concerne le domaine des aubages de turbomachine, celui en particulier des aubages obtenus par coulée d'un alliage en fusion dans un moule selon la technique de fonderie à la cire perdue.The present invention relates to the field of turbomachine blades, in particular the blades obtained by casting a molten alloy in a mold according to the lost wax casting technique.

Classiquement, la technique de fonderie à cire perdue consiste en premier lieu à réaliser un modèle en cire, ou en tout autre matériau facilement éliminable par la suite, de la pièce à réaliser ; ce modèle comprend une pièce interne formant un noyau en céramique qui figure les cavités que l'on souhaite voir apparaitre à l'intérieur de l'aubage. Le modèle en cire est ensuite trempé plusieurs fois dans des barbotines constituées d'une suspension de particules céramiques pour confectionner, par des opérations dite de stucage et de séchage, un moule carapace.Conventionally, the lost-wax foundry technique consists first and foremost in producing a wax model, or any other easily removable material, of the part to be produced; this model includes an internal part forming a ceramic core which shows the cavities that one wishes to appear inside the vane. The wax model is then soaked several times in slips consisting of a suspension of ceramic particles for making, by so-called stuccoing and drying operations, a shell mold.

On procède ensuite au décirage du moule carapace, qui est une opération par laquelle on élimine de la carapace la cire ou le matériau constituant le modèle d'origine. Après cette élimination, on obtient un moule céramique dont la cavité reproduit toutes les formes de l'aube et qui renferme encore le noyau céramique destiné à générer les cavités internes de celle-ci. Le moule subit ensuite un traitement thermique à haute température ou « cuisson » qui lui confère les propriétés mécaniques nécessaires.The carapace mold is then dewaxed, which is an operation by which the wax or the material constituting the original model is removed from the shell. After this elimination, a ceramic mold is obtained, the cavity of which reproduces all the shapes of the blade and which still contains the ceramic core intended to generate the internal cavities thereof. The mold then undergoes heat treatment at high temperature or "cooking" which gives it the necessary mechanical properties.

Le moule carapace est alors prêt pour la fabrication de la pièce métallique par coulée. Après contrôle de l'intégrité interne et externe du moule carapace, l'étape suivante consiste à couler un métal en fusion, qui vient occuper les vides entre la paroi intérieure du moule carapace et le noyau, puis à le solidifier. Dans le domaine de la fonderie à cire perdue, on distingue actuellement plusieurs techniques de solidification, donc plusieurs techniques de coulée, selon la nature de l'alliage et les propriétés attendues de la pièce résultant de la coulée. Il peut s'agir de solidification dirigée à structure colonnaire (DS), de solidification dirigée à structure monocristalline (SX) ou de solidification équiaxe (EX).The shell mold is then ready for the manufacture of the metal part by casting. After checking the internal and external integrity of the shell mold, the next step is to cast a molten metal, which occupies the voids between the inner wall of the shell mold and the core, and to solidify it. In the field of lost-wax foundry, there are currently several solidification techniques, and therefore several casting techniques, depending on the nature of the alloy and the expected properties of the part resulting from the casting. It may be directed solidification with columnar structure (DS), directed solidification with monocrystalline structure (SX) or equiaxed solidification (EX).

Après la coulée de l'alliage, on casse la carapace par une opération de décochage. Au cours d'une autre étape, on élimine chimiquement le noyau céramique qui est resté enfermé dans l'aube obtenue. L'aube métallique obtenue subit ensuite des opérations de parachèvement qui permettent d'obtenir la pièce finie.After the casting of the alloy, it breaks the shell by a shake operation. In another step, the ceramic core which has remained enclosed in the blade obtained is chemically removed. The metal blade obtained then undergoes finishing operations that make it possible to obtain the finished part.

Des exemples de réalisation d'aubes de turbine par la technique de fonderie à la cire perdue sont donnés dans les demandes de brevets FR2875425 et FR2874186 de la demanderesse.Examples of embodiments of turbine blades by the lost-wax casting technique are given in the patent applications FR2875425 and FR2874186 of the plaintiff.

Pour former le modèle en cire de l'aube on utilise un outillage, ou moule d'injection cire, dans lequel on place le noyau puis on injecte la cire liquide par un canal prévu à cet effet.To form the wax model of the dawn is used a tool, or wax injection mold, in which the core is placed and then the liquid wax is injected by a channel provided for this purpose.

La recherche de performances accrues des moteurs implique notamment un refroidissement plus efficace des aubes de turbine situées immédiatement en aval de la chambre de combustion. Cette exigence nécessite la formation à l'intérieur de ces aubes de cavités internes de circulation du fluide de refroidissement plus élaborées. Ces aubes présentent la particularité d'avoir plusieurs parois métalliques et requièrent dont la fabrication de noyaux céramiques de plus en plus complexes.The quest for increased engine performance includes more efficient cooling of the turbine blades immediately downstream of the combustion chamber. This requirement requires formation within these more elaborate internal cooling fluid flow cavity vanes. These blades have the particularity of having several metal walls and require, including the manufacture of ceramic cores increasingly complex.

En raison de la complexité des cavités de refroidissement à former avec leurs cloisons de séparation, et de leur agencement, on réalise le noyau en plusieurs parties que l'on assemble et colle. Les noyaux élémentaires sont généralement liés entre eux au niveau du pied et du sommet. Il s'agit en effet de maîtriser l'épaisseur des parois et des cloisons formés au moment de la coulée. L'assemblage doit permettre au noyau de supporter les contraintes subies lors des étapes d'injection de la cire, de décirage puis de la coulée.Due to the complexity of the cooling cavities to be formed with their partition walls, and their arrangement, the core is made in several parts that are assembled and glued. Elemental nuclei are usually linked together at the foot and the summit. It is in fact to control the thickness of the walls and partitions formed at the time of casting. The assembly must allow the core to withstand the stresses experienced during the steps of wax injection, dewaxing and casting.

Il convient ainsi de placer les différentes parties du noyau de façon très précise les unes relativement aux autres dans le moule d'injection de cire et de garantir un maintien des positions relatives des différentes parties du noyau. Le maintien des différentes parties du noyau tel que proposé dans la technique actuelle consiste à relier fixement ces parties ou éléments de noyaux à la carapace céramique. Si un tel maintien permet en théorie de garantir un positionnement relatif précis des différents éléments du noyau, on observe que la coulée de métal en fusion conduit à une dilatation thermique non négligeable des éléments du noyau induisant, du fait d'une fixation statique des éléments constitutifs du noyau les uns par rapport aux autres à des déformations de certains de ces éléments, ce qui contribue à augmenter le taux de rebut des aubes. Dans des cas critiques, l'un des éléments du noyau peut même se briser conduisant à l'évidence à rebuter l'aube obtenue mais également à fabriquer de nouveau un noyau, ce qui est coûteux et long.It is thus necessary to place the different parts of the core very precisely relative to each other in the wax injection mold and to ensure a maintenance of the relative positions of the different parts of the core. The maintenance of the various parts of the core as proposed in the present art consists in firmly connecting these parts or elements of cores to the ceramic shell. If such a maintenance allows in theory to to guarantee a precise relative positioning of the various elements of the core, it is observed that the molten metal casting leads to a significant thermal expansion of the elements of the nucleus inducing, because of a static fixation of the constituent elements of the core with respect to other to deformations of some of these elements, which contributes to increase the scrap rate of the blades. In critical cases, one of the elements of the nucleus can even break, obviously leading to the rejection of the dawn obtained but also to making a new core, which is expensive and time consuming.

L'invention a notamment pour but d'apporter une solution simple, efficace et économique aux problèmes de l'art antérieur décrit précédemment.The invention aims in particular to provide a simple, effective and economical solution to the problems of the prior art described above.

A cet effet, elle propose un noyau utilisé pour la fabrication par fonderie à la cire perdue d'une aube de turbomachine, s'étendant selon une direction longitudinale entre un pied et une tête et comprenant un élément principal et au moins un premier élément secondaire comportant chacun une partie fonctionnelle et une partie non fonctionnelle, caractérisé en ce que la partie non fonctionnelle de l'élément principal et la partie non fonctionnelle dudit au moins un premier élément secondaire sont assemblées et conformées de manière à coopérer en glissement l'une avec l'autre dans la direction longitudinale et en rotation autour de cette direction longitudinale.For this purpose, it proposes a core used for the lost wax casting of a turbomachine blade, extending in a longitudinal direction between a foot and a head and comprising a main element and at least a first secondary element. each comprising a functional part and a non-functional part, characterized in that the non-functional part of the main element and the non-functional part of said at least one secondary element are assembled and shaped so as to cooperate in sliding one with the other in the longitudinal direction and in rotation about this longitudinal direction.

Selon l'invention, la liaison de l'élément principal et du premier élément secondaire du noyau autorise un déplacement relatif par glissement longitudinal et par rotation des éléments de noyaux l'un par rapport à l'autre. Plus particulièrement, lorsque l'élément principal est fixé dans la carapace céramique, le premier noyau secondaire peut se dilater longitudinalement et en rotation dans sa partie non fonctionnelle. Ainsi, il est possible de limiter les déformations et les cassures du noyau, ce qui réduit le taux de rebut des aubes à la fin d'une opération de fonderie à la cire perdue.According to the invention, the connection of the main element and the first secondary element of the core allows relative displacement by longitudinal sliding and rotation of the core elements relative to each other. More particularly, when the main element is fixed in the ceramic shell, the first secondary core can expand longitudinally and in rotation in its non-functional part. Thus, it is possible to limit deformations and kernel breaks, which reduces the scrap rate of the blades at the end of a lost wax casting operation.

Egalement, l'utilisation de parties non fonctionnelles des éléments de noyaux évite de modifier les parties fonctionnelles du noyau. En effet, le dimensionnement de ces parties fonctionnelles est délicat à réaliser et une modification de leurs formes pour des raisons autres que celles en relation avec la forme finale de l'aube n'est pas souhaitable. Les parties non fonctionnelles sont formées à une extrémité longitudinale du noyau, de préférence au niveau du pied du noyau.Also, the use of non-functional parts of the core elements avoids modifying the functional parts of the core. Indeed, the sizing of these functional parts is difficult to achieve and a modification of their shapes for reasons other than those in relation to the final shape of the blade is not desirable. The non-functional portions are formed at a longitudinal end of the core, preferably at the foot of the core.

Le terme « fonctionnelle » utilisé en référence au noyau permet d'indiquer si la partie ainsi qualifiée permet de réaliser une face de la géométrie finale de l'aube. Ainsi, une partie non fonctionnelle fait référence à une zone d'un élément du noyau qui n'a pas d'impact sur la géométrie finale de la pièce.The term "functional" used in reference to the nucleus makes it possible to indicate whether the part thus qualified makes it possible to make a face of the final geometry of the blade. Thus, a non-functional part refers to an area of a kernel element that has no impact on the final geometry of the part.

La direction longitudinale correspond à une direction s'étendant depuis le pied de l'aube jusqu'au sommet de l'aube, cette direction longitudinale étant sensiblement perpendiculaire à l'axe de rotation de la turbomachine.The longitudinal direction corresponds to a direction extending from the root of the blade to the top of the blade, this longitudinal direction being substantially perpendicular to the axis of rotation of the turbomachine.

Selon une autre caractéristique de l'invention, le glissement est un glissement linéique c'est-à-dire suivant une ligne, plus spécifiquement une ligne droite, le glissement étant alors linéique rectiligne. L'élément principal du noyau et le premier élément secondaire du noyau sont donc positionnés et guidés en déplacement l'un par rapport à l'autre au niveau du pied selon une ligne rectiligne du premier élément secondaire glissant sur un plan de l'élément principal. Cela permet également d'avoir un positionnement isostatique et non hyperstatique du premier élément secondaire sur l'élément principal.According to another characteristic of the invention, the sliding is a linear slip, that is to say along a line, more specifically a straight line, the slip then being linear straight. The main element of the core and the first secondary element of the core are thus positioned and guided in displacement relative to each other at the level of the foot along a straight line of the first secondary element sliding on a plane of the main element. . This also makes it possible to have an isostatic and non-hyperstatic positioning of the first secondary element on the main element.

Le mode de glissement linéique, plus particulièrement rectiligne, se distingue d'un glissement d'une surface sur une autre surface, en évitant que des contraintes mécaniques excessives s'exercent sur le premier élément secondaire et l'élément principal et engendrent le flambage, la déformation voire une cassure des éléments du noyau.The linear sliding mode, more particularly rectilinear, differs from a sliding of a surface on another surface, avoiding excessive mechanical stresses on the first secondary element and the main element and cause buckling, the deformation or even a break of the elements of the nucleus.

Afin d'autoriser les dilations différentielles entre le premier élément secondaire de noyau et la carapace ainsi que les dilatations absolues desdites deux parties du noyau par rapport au moule carapace, un jeu de dilation peut être prévu entre le moule carapace et le premier élément secondaire. Ce jeu de dilation peut être réalisé par interposition d'une pellicule de vernis entre le premier élément secondaire et un bossage du moule carapace. On comprend que lors de l'opération de décirage et de cuisson du moule carapace, la pellicule de vernis sera éliminée donnant lieu à la formation d'un espace libre formant un jeu entre le premier élément secondaire et le moule carapace.In order to allow differential dilations between the first core sub-element and the carapace as well as the absolute expansions of said two core parts with respect to the shell mold, a set of expansion may be provided between the shell mold and the first secondary element. This expansion set can be achieved by interposing a film of varnish between the first secondary element and a boss of the shell mold. It will be understood that during the dewaxing and baking operation of the shell mold, the film of varnish will be eliminated, giving rise to the formation of a free space forming a clearance between the first secondary element and the shell mold.

Avantageusement, la combinaison du jeu de dilatation et du guidage linéique précité limite fortement les risques de cassure du noyau, permettant ainsi d'optimiser le procédé de fabrication des aubes.Advantageously, the combination of the expansion clearance and the aforementioned linear guide greatly limits the risk of kernel breakage, thus making it possible to optimize the blade manufacturing process.

Ladite partie non fonctionnelle dudit au moins un élément secondaire peut comprendre une tige engagée en glissement dans une première gorge de la partie non fonctionnelle de l'élément principal. Le guidage linéique rectiligne peut alors s'effectuer au niveau de la zone de contact de la tige avec le fond de la gorge. La pellicule de vernis est alors déposée sur une portion de la face de la tige agencée à l'opposé du fond de la première gorge.Said non-functional part of said at least one secondary element may comprise a rod engaged in sliding in a first groove of the non-functional part of the main element. Linear linear guidance can then be performed at the contact zone of the rod with the bottom of the groove. The lacquer film is then deposited on a portion of the face of the rod arranged opposite the bottom of the first groove.

La première gorge peut comprendre deux flancs latéraux s'éloignant l'un de l'autre en direction du débouché de la première gorge. L'utilisation de tels flancs permet de faciliter le centrage de la tige dans la gorge. Lorsque la tige est à section sensiblement circulaire, l'appui linéique peut se faire avec une surface de fond de gorge qui est plane.The first groove may comprise two lateral flanks moving away from each other towards the outlet of the first groove. The use of such flanks facilitates the centering of the rod in the groove. When the rod is of substantially circular section, the linear support can be done with a groove bottom surface which is flat.

Dans une réalisation, le noyau comprend un second élément secondaire dont une partie non fonctionnelle comprend une tige engagée en glissement longitudinal dans une seconde gorge de la partie non fonctionnelle de l'élément principal.In one embodiment, the core comprises a second secondary member of which a non-functional portion comprises a rod engaged in longitudinal sliding in a second groove of the non-functional part of the main element.

La tige du premier élément secondaire et la tige du second élément secondaire sont par exemples agencés symétriquement l'une de l'autre par rapport à une droite s'étendant longitudinalement, la première gorge et la seconde gorge débouchant dans des sens opposés selon une direction perpendiculaire à la direction longitudinale.The stem of the first secondary element and the rod of the second secondary element are for example arranged symmetrically with each other with respect to a straight line extending longitudinally, the first groove and the second groove opening in opposite directions in one direction. perpendicular to the longitudinal direction.

Elle concerne aussi un procédé de fabrication d'une aube au moyen d'un noyau tel que décrit ci-dessus, dans lequel la partie non fonctionnelle de l'élément principal du noyau est retenue dans un moule d'injection de cire par un moyen d'ancrage sur une paroi du moule.It also relates to a method of manufacturing a blade by means of a core as described above, in which the non-functional part of the main element of the core is retained in a wax injection mold by a means anchoring on a wall of the mold.

L'invention sera mieux comprise et d'autres détails, avantages et caractéristiques de l'invention apparaîtront à la lecture de la description suivante faite à titre d'exemple non limitatif, en référence aux figures suivantes :

  • la figure 1 est une vue schématique en perspective d'une extrémité inférieure d'un noyau selon l'invention ;
  • la figure 2 est une vue schématique en perspective de l'élément principal du noyau selon l'invention ;
  • la figure 3 est une vue schématique selon une ligne de coupe du montage d'une tige d'un élément du noyau dans une gorge d'un autre élément du noyau.
The invention will be better understood and other details, advantages and features of the invention will become apparent on reading the following description given by way of non-limiting example, with reference to the following figures:
  • the figure 1 is a schematic perspective view of a lower end of a core according to the invention;
  • the figure 2 is a schematic perspective view of the main element of the core according to the invention;
  • the figure 3 is a schematic view along a sectional line of mounting a rod of a core member in a groove of another element of the core.

On se réfère tout d'abord à la figure 1 représentant une extrémité inférieure d'un noyau 10 selon l'invention comprenant un élément principal 12 et deux éléments secondaires, à savoir un premier élément secondaire 14 et un second élément secondaire 16. Sur la figure 1, seules sont représentées les parties non fonctionnelles des éléments constitutifs du noyau 10, ces parties non fonctionnelles étant agencées à une extrémité longitudinale du noyau 10 (double flèche L). Comme indiqué précédemment, une partie non fonctionnelle du noyau 10 est une partie ne participant pas à la géométrie finale de la pièce lors du processus de fonderie à la cire perdue.We first refer to the figure 1 representing a lower end of a core 10 according to the invention comprising a main element 12 and two secondary elements, namely a first secondary element 14 and a second secondary element 16. On the figure 1 only the non-functional parts of the constituent elements of the core 10 are represented, these non-functional parts being arranged at a longitudinal end of the core 10 (double arrow L). As indicated previously, a non-functional part of the core 10 is a part not participating in the final geometry of the part during the lost wax casting process.

Le noyau 10 s'étend selon trois directions perpendiculaires deux à deux, une direction longitudinale L correspondant sur l'aube finale à la direction longitudinale L reliant le pied au sommet de l'aube, une direction axiale A (figure 1) correspondant sur l'aube finale à la direction amont/aval et une direction transverse T traversant les faces d'intrados et d'extrados de l'aube (figure 3). Le noyau comprend une tête 17 sur la figure 1 et un pied 11 qui est seul représenté sur la figure 1.The core 10 extends in three directions perpendicular two by two, a longitudinal direction L corresponding to the final blade in the longitudinal direction L connecting the foot to the top of the blade, an axial direction A ( figure 1 ) corresponding on the final dawn to the upstream / downstream direction and a transverse direction T passing through the intrados and extrados faces of the dawn ( figure 3 ). The core comprises a head 17 on the figure 1 and a foot 11 which is alone represented on the figure 1 .

L'élément principal 12 du noyau 10 est destiné à former dans sa partie fonctionnelle (non représentée) une cavité centrale de l'aube et les premier et second éléments secondaires 14, 16 sont destinés à former dans leurs parties fonctionnelles (non représentées) des cavités dans les parois d'intrados et d'extrados de l'aube.The main element 12 of the core 10 is intended to form in its functional part (not shown) a central cavity of the blade and the first and second secondary elements 14, 16 are intended to form in their functional parts (not shown) cavities in the intrados and extrados walls of the dawn.

Comme cela est bien visible sur la figure 1, la partie non fonctionnelle du premier élément secondaire 14 comprend une tige ou doigt 18 s'étendant sensiblement longitudinalement et qui est logée dans une première gorge 20 ou encoche sensiblement longitudinale de la partie non fonctionnelle de l'élément principal 12 (figures 1 et 2). De même, le second élément secondaire 16 comprend dans sa partie non fonctionnelle une tige 22 s'étendant sensiblement longitudinalement et qui est logée dans une seconde gorge 24 ou encoche sensiblement longitudinale de la partie non fonctionnelle de l'élément principal 12 (figures 1 et 2). L'invention couvre également les réalisations dans lesquelles l'élément principal 12 du noyau 10 ne comprend qu'une seule gorge associée à un seul élément secondaire du noyau.As is clearly visible on the figure 1 the non-functional part of the first secondary element 14 comprises a rod or finger 18 extending substantially longitudinally and which is housed in a first groove 20 or substantially longitudinal notch of the non-functional part of the main element 12 ( Figures 1 and 2 ). Similarly, the second secondary element 16 comprises in its non-functional part a rod 22 extending substantially longitudinally and which is housed in a second groove 24 or notch substantially longitudinal of the non-functional part of the main element 12 ( Figures 1 and 2 ). The invention also covers the embodiments in which the main element 12 of the core 10 comprises only one groove associated with a single secondary element of the core.

Comme représenté sur la figure 2, la première gorge 20 et la seconde gorge 24 débouchent dans des sens opposés selon une direction perpendiculaire (double flèche T) à la direction longitudinale L, c'est-à-dire selon la direction transverse T. La tige 18 du premier élément secondaire 12 et la tige 22 du second élément secondaire 16 sont symétriques l'une de l'autre par rapport à une droite D s'étendant longitudinalement L.As shown on the figure 2 , the first groove 20 and the second groove 24 open in opposite directions in a perpendicular direction (double arrow T) to the longitudinal direction L, that is to say in the transverse direction T. The rod 18 of the first secondary element 12 and the rod 22 of the second secondary element 16 are symmetrical to one another with respect to a straight line D extending longitudinally L.

La première gorge 20 et la seconde gorge 24 sont séparées l'une de l'autre par un voile 26 de matière de l'élément principal 12 du noyau, ce voile 26 étant incliné en oblique par rapport à un premier plan contenant la direction longitudinale L et la direction transverse T et un second plan contenant la direction longitudinale L et la direction axiale A.The first groove 20 and the second groove 24 are separated from one another by a web 26 of material of the main element 12 of the core, this web 26 being inclined obliquely with respect to a first plane containing the longitudinal direction L and the transverse direction T and a second plane containing the longitudinal direction L and the axial direction A.

Selon l'invention, la tige 18 du premier élément 14 secondaire est montée à coulissement dans la première gorge 20 de l'élément principal 12 du noyau 10 de même que la tige 22 du second élément 16 secondaire est montée à coulissement dans la seconde gorge 24 de l'élément principal 12 du noyau 10. De plus, chacune des gorges 20, 24 est conformée de manière à autoriser un degré de liberté en rotation des tiges 18, 22 autour de l'axe longitudinal L.According to the invention, the rod 18 of the first secondary element 14 is slidably mounted in the first groove 20 of the main element 12 of the core 10 just as the rod 22 of the second secondary element 16 is slidably mounted in the second groove 24 of the main element 12 of the core 10. In addition, each of the grooves 20, 24 is shaped to allow a degree of freedom in rotation of the rods 18, 22 about the longitudinal axis L.

Les tiges 18, 22 ont une forme circulaire et le fond 28 des gorges 20, 22 est plan de sorte que le contact entre une tige 18, 22 et le fond 28 d'une gorge 20, 24 est un contact linéique rectiligne, ce qui permet de réaliser un guidage suivant un appui rectiligne du premier élément secondaire du noyau et du second élément secondaire du noyau sur l'élément principal du noyau sans liaison hyperstatique. De cette manière on limite fortement les frottements des trois parties du noyau les unes sur les autres et ont permet les dilatations relatives.The rods 18, 22 have a circular shape and the bottom 28 of the grooves 20, 22 is plane so that the contact between a rod 18, 22 and the bottom 28 of a groove 20, 24 is a straight linear contact, which allows guiding in a rectilinear support of the first secondary element of the core and the second secondary element of the core on the main element of the core without hyperstatic connection. In this way the friction of the three parts of the core on each other is strongly limited and allows the relative expansions.

De plus, chaque tige 18, 22 est dimensionnée de manière à ce que son diamètre affleure le plan de sortie 30 de la gorge 20, 24 dans laquelle elle est engagée. Ainsi, on peut assurer un contact linéique entre la carapace 32 et la tige 18, 22 de chacun des premier 14 et second 16 éléments secondaires.In addition, each rod 18, 22 is dimensioned so that its diameter is flush with the outlet plane 30 of the groove 20, 24 in which it is engaged. Thus, one can ensure a linear contact between the shell 32 and the rod 18, 22 of each of the first 14 and second 16 secondary elements.

Chaque gorge 20, 24 comprend deux flancs 34, 36 opposés reliées l'un à l'autre par la paroi de fond 28 plane. Les deux flancs 34, 36 de chaque gorge 20, 24 s'éloignent l'un de l'autre en direction du débouché de la gorge 20, 24. Comme cela est visible sur la figure 3, la largeur de la gorge 20, 24 mesurée au niveau de la paroi de fond 28 est inférieure au diamètre de la tige 18, 22.Each groove 20, 24 comprises two opposite sides 34, 36 connected to each other by the bottom wall 28 flat. The two flanks 34, 36 of each groove 20, 24 move away from each other towards the outlet of the groove 20, 24. As can be seen on the figure 3 , the width of the groove 20, 24 measured at the bottom wall 28 is smaller than the diameter of the rod 18, 22.

Comme représenté en figure 3, le moule carapace comprend un premier bossage 38 interne formé sur une face interne du moule 40 et positionnée de manière à serrer la tige 18 du premier élément secondaire 14 du noyau 10 dans la première encoche 20 de l'élément principal 12 du noyau 10. De manière similaire, le moule 40 comprend un second bossage (non représenté) interne formé sur une face interne du moule 40 et positionnée de manière à serrer la tige 22 du second élément secondaire 16 du noyau 10 dans la seconde encoche 24 de l'élément principal 12 du noyau 10. On remarque que les premier 38 et second bossages sont ainsi formés sur des faces en vis-à-vis du moule dans la direction transverse T et recouvre les débouchés des première 20 seconde 24 encoches. On comprend que la zone 44 séparant le moule carapace 40 du noyau 10 comprend de la cire.As represented in figure 3 , the shell mold comprises a first internal boss 38 formed on an inner face of the mold 40 and positioned so as to clamp the rod 18 of the first secondary element 14 of the core 10 in the first notch 20 of the main element 12 of the core 10. Similarly, the mold 40 comprises a second internal boss (not shown) formed on an inner face of the mold 40 and positioned so as to clamp the rod 22 of the second secondary element 16 of the core 10 in the second notch 24 of the element main 12 of the core 10. On note that the first 38 and second bosses are thus formed on faces facing the mold in the transverse direction T and covers the outlets of the first 20 second 24 notches. It is understood that the zone 44 separating the shell mold 40 from the core 10 comprises wax.

Chaque bossage 38 comprend deux flancs longitudinaux 38a, 38b inclinés en oblique l'un par rapport à l'autre, convergeant l'un vers l'autre vers l'intérieur du moule 40 et reliés l'un à l'autre par une paroi 38c de serrage des tiges 18, 22 des premier et second éléments secondaires 14, 16 du noyau 10 dans le fond de l'encoche 20, 24. De préférence, les flancs 38a, 38b sont inclinés d'un angle compris entre 10 et 30° par rapport à un plan contenant la direction longitudinale A et la direction transverse T à la direction longitudinale et passant entre les deux flancs 38a, 38b.Each boss 38 comprises two longitudinal flanks 38a, 38b obliquely inclined relative to each other, converging towards one another towards the inside of the mold 40 and connected to one another by a wall 38c clamping rods 18, 22 of the first and second secondary members 14, 16 of the core 10 in the bottom of the notch 20, 24. Preferably, the sides 38a, 38b are inclined at an angle between 10 and 30 ° with respect to a plane containing the longitudinal direction A and the transverse direction T in the longitudinal direction and passing between the two sides 38a, 38b.

Comme cela est visible sur la figure 3, une pellicule de vernis 42 est interposée entre la tige 18, 22 de chacune de la partie non fonctionnelle du premier élément secondaire 14 et de la partie non fonctionnelle du second élément secondaire 16 et la paroi 38c du bossage 38 en regard. On comprend que lors de l'opération de décirage et de cuisson du moule carapace, la pellicule 42 de vernis sera éliminée donnant lieu à la formation d'un espace libre formant un jeu entre chacun du premier élément secondaire 14 et du second élément secondaire 22 et le moule carapace 40. Cet espace libre forme un moyen de maintien glissant des secondes parties non fonctionnelles des premier 14 et second 16 élément secondaires.As is visible on the figure 3 , a film of varnish 42 is interposed between the rod 18, 22 of each of the non-functional part of the first secondary element 14 and the non-functional part of the second secondary element 16 and the wall 38c of the boss 38 facing each other. It will be understood that during the dewaxing and baking operation of the shell mold, the film 42 of varnish will be eliminated, giving rise to the formation of a free space forming a clearance between each of the first secondary element 14 and the second secondary element 22 and the carapace mold 40. This free space forms a means of sliding support of the second non-functional parts of the first 14 and second 16 secondary elements.

Si l'invention a été décrite en relation avec la coopération à glissement linéique rectiligne et rotation d'une tige dans une gorge 20, 24, on comprend que ces déplacements peuvent être obtenus d'autres façons qui entrent dans la portée de la protection.If the invention has been described in connection with the linear linear sliding cooperation and rotation of a rod in a groove 20, 24, it is understood that these displacements can be obtained in other ways that fall within the scope of protection.

Ainsi, dans une autre réalisation de l'invention, la tige 18 du premier élément secondaire 14 et la tige 22 du second élément secondaire 16 pourraient avoir une forme autre que circulaire, par exemple ovale, plus généralement de forme concave.Thus, in another embodiment of the invention, the rod 18 of the first secondary element 14 and the rod 22 of the second secondary element 16 may have a shape other than circular, for example oval, more generally concave.

Claims (10)

Noyau (10) utilisé pour la fabrication par fonderie à la cire perdue d'une aube de turbomachine, ledit noyau s'étendant selon une direction longitudinale (L) entre un pied (11) et une tête et comprenant un élément principal (12) et au moins un premier élément secondaire (14) comportant chacun une partie fonctionnelle et une partie non fonctionnelle, caractérisé en ce que la partie non fonctionnelle de l'élément principal (12) et la partie non fonctionnelle dudit au moins un premier élément secondaire (14) sont assemblées et conformées de manière à coopérer en glissement l'une avec l'autre dans la direction longitudinale (L) et en rotation autour de cette direction longitudinale (L).Core (10) used for the lost wax casting of a turbomachine blade, said core extending in a longitudinal direction (L) between a foot (11) and a head and comprising a main member (12) and at least one first secondary element (14) each having a functional part and a non-functional part, characterized in that the non-functional part of the main element (12) and the non-functional part of said at least one first secondary element ( 14) are assembled and shaped so as to cooperate slidingly with each other in the longitudinal direction (L) and in rotation about this longitudinal direction (L). Noyau selon la revendication 1, caractérisé en ce que le glissement est un glissement linéique rectiligne et les parties non fonctionnelles sont formées à une extrémité longitudinale du noyau (10), de préférence au niveau du pied (11) du noyau (10).Core according to claim 1, characterized in that the sliding is a linear linear sliding and the non-functional parts are formed at a longitudinal end of the core (10), preferably at the foot (11) of the core (10). Noyau selon la revendication 1 ou 2, caractérisé en ce que ladite partie non fonctionnelle du premier élément secondaire (14) comprend une tige (18) engagée en glissement dans une première gorge (20) de la partie non fonctionnelle de l'élément principal (12).Core according to claim 1 or 2, characterized in that said non-functional part of the first secondary element (14) comprises a rod (18) slidably engaged in a first groove (20) of the non-functional part of the main element ( 12). Noyau selon la revendication 3, caractérisé en ce que la première gorge (20) comprend deux flancs (34, 36) latéraux s'éloignant l'un de l'autre en direction du débouché de la première gorge (20).Core according to claim 3, characterized in that the first groove (20) comprises two side flanks (34, 36) moving away from each other towards the outlet of the first groove (20). Noyau selon la revendication 4, caractérisé en ce que les flancs (34, 36) sont reliées à une paroi de fond (28) sensiblement plane.Core according to claim 4, characterized in that the flanks (34, 36) are connected to a substantially flat bottom wall (28). Noyau selon la revendication 3 à 5, caractérisé en ce que la tige (18) a une section sensiblement circulaire.Core according to claim 3 to 5, characterized in that the rod (18) has a substantially circular section. Noyau selon l'une des revendications 1 à 6, caractérisé en ce qu'il comprend un second élément secondaire (16) dont une partie non fonctionnelle comprend une tige (22) engagée en glissement longitudinal dans une seconde gorge (24) de la partie non fonctionnelle de l'élément principal (12).Core according to one of claims 1 to 6, characterized in that it comprises a second secondary element (16), a non-functional part comprises a rod (22) engaged in longitudinal sliding. in a second groove (24) of the non-functional part of the main element (12). Noyau suivant la revendication 7, caractérisé en ce que la seconde gorge se situe sur une face du premier élément opposée à la première gorge.Core according to Claim 7, characterized in that the second groove is situated on one face of the first element opposite to the first groove. Noyau selon la revendication 7 ou 8, caractérisé en ce que la tige (18) du premier élément secondaire (12) et la tige (22) du second élément secondaire (16) sont symétriques l'une de l'autre par rapport à une droite (D) s'étendant longitudinalement (L), la première gorge (20) et la seconde gorge (24) débouchant dans des sens opposés selon une direction perpendiculaire (T) à la direction longitudinale (L).Core according to claim 7 or 8, characterized in that the rod (18) of the first secondary element (12) and the rod (22) of the second secondary element (16) are symmetrical to one another with respect to a straight line (D) extending longitudinally (L), the first groove (20) and the second groove (24) opening in opposite directions in a direction perpendicular (T) to the longitudinal direction (L). Procédé de fabrication d'une aube au moyen d'un noyau (10) selon l'une des revendications précédentes, dans lequel la partie non fonctionnelle de l'élément principal (12) du noyau (10) est retenue dans un moule d'injection de cire par un moyen d'ancrage sur une paroi du moule.A method of manufacturing a blade by means of a core (10) according to one of the preceding claims, wherein the non-functional part of the main element (12) of the core (10) is retained in a mold of injection of wax by an anchoring means on a wall of the mold.
EP18168395.4A 2017-04-28 2018-04-20 Core for the fabrication of a turbine engine blade Active EP3395471B1 (en)

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FR3065662B1 (en) 2020-11-13
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FR3065662A1 (en) 2018-11-02
CN108788019A (en) 2018-11-13
US20180311722A1 (en) 2018-11-01
CN108788019B (en) 2022-07-19

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