WO2010076513A1 - Procede de fabrication d'une aube de turbomachine - Google Patents
Procede de fabrication d'une aube de turbomachine Download PDFInfo
- Publication number
- WO2010076513A1 WO2010076513A1 PCT/FR2009/052596 FR2009052596W WO2010076513A1 WO 2010076513 A1 WO2010076513 A1 WO 2010076513A1 FR 2009052596 W FR2009052596 W FR 2009052596W WO 2010076513 A1 WO2010076513 A1 WO 2010076513A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- preform
- curved lines
- configuration
- son
- cut ends
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/24—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in at least three directions forming a three dimensional structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B11/00—Making preforms
- B29B11/14—Making preforms characterised by structure or composition
- B29B11/16—Making preforms characterised by structure or composition comprising fillers or reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/545—Perforating, cutting or machining during or after moulding
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D25/00—Woven fabrics not otherwise provided for
- D03D25/005—Three-dimensional woven fabrics
-
- 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
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/282—Selecting composite materials, e.g. blades with reinforcing filaments
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
- B29C70/48—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs and impregnating the reinforcements in the closed mould, e.g. resin transfer moulding [RTM], e.g. by vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/08—Blades for rotors, stators, fans, turbines or the like, e.g. screw propellers
-
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/44—Resins
-
- 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
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/614—Fibres or filaments
Definitions
- the invention relates to a method of manufacturing, by three-dimensional weaving (3D) of a turbomachine blade, particularly but not exclusively a large blade, for example for an aircraft jet engine fan.
- the invention relates more particularly to an improvement making it possible to better control the implementation of certain steps of the method so that the final characteristics of the blade are as close as possible to those of a control blade considered optimal.
- the document EP 1 777 063 describes a process for manufacturing a blade obtained from a preform made by 3D weaving weft yarns and warp yarns. Typically, these threads are made of carbon fibers.
- the preform thus obtained is then shaped by positioning in a suitable mold before being compacted and stiffened. Finally, the preform thus conditioned is placed in a heating mold forming an oven in which a thermosetting resin is injected. The dawn in the raw state extracted from the mold has practically its shape and its final dimensions and requires only minimal retouching by machining.
- the warp son are divided into 32 layers, each layer being composed of several hundred son.
- the warp threads are also called strands in the technique under consideration. Thanks to the loom, it is possible to individually position all these warp threads on either side of the direction of passage of the weft threads, which allows a total determination of the weave concerning the contour of the preform, its texture and its thickness in all points. With this technique, even the blade root can be made in one piece with the pale.
- the invention results from observations resulting from a large number of tests intended to define the characteristics of an optimum blade, that is to say having a maximum resistance to the types of impact to which such a blade is capable of be submitted during its period of use. For each type of blade, it has been possible to demonstrate a certain correspondence between the resistance of the blade and the configuration of the curved lines. This made it possible to define, by successive tests, an ideal weave represented by an optimal configuration of all these curved lines (that is to say the exact locations of all these cuts) for which the blade produced, if it has this configuration, can be considered the most efficient.
- the invention therefore relates to a process for manufacturing a blade by 3D weaving of a preform according to which warp and weft threads are cut at predetermined locations so as to define the contours and the volume of said preform. conforming said preform and resin impregnating said shaped preform characterized by the steps of;
- the weft and warp threads are preferably based on carbon fibers. At least some son, preferably the warp son are surrounded by a sizing sheath. This control process, active or passive, can be applied at different stages of dawn manufacturing, particularly during the conformation that may include shaping followed by compaction.
- the warp and weft threads are cut to extract the preform from the loom.
- the principle of the invention as defined above can be applied successively to several of these steps.
- the preform is acted upon to substantially coincide its curved lines with those of such a reference configuration. It is conceivable to act thus on the preform at several stages before the impregnation phase, but mainly, of course, at the moment of the shaping phase immediately following the weaving. Indeed, the ability to identify from the visible configuration (or at least detectable) of the curved lines makes it possible to adapt the positioning of the preform in its conformation template (a part of the compaction mold, for example) and acting on the entanglement of the son still malleable to actually give (we can speak of an active control) curved lines, the configuration as close as possible to the predetermined optimal configuration.
- the method can also be characterized in that said preform is compacted after shaping and in that it verifies that its curved lines coincide substantially with those of a corresponding reference configuration.
- This verification or control makes it possible to ensure that the compaction has not modified the optimum configuration of the curved lines, representative of both the weave and an optimal conformation of the preform. If this is not the case, either the compacting step can be resumed to obtain an acceptable configuration of the curved lines or to discard the blank, if this is not possible.
- a final control of the same type can be carried out after impregnation.
- a blade is selected during manufacture, after impregnation if its curved lines coincide substantially with those of a corresponding reference configuration.
- the method preferably applies via the identification of cuts of the warp threads, for example by accentuating their visibility.
- the method could also be applied by accentuating the visibility of the cuts of the weft son.
- Pensimage is the coating of the wires which, by melting under the effect of heat during the compacting operation, makes it possible to bind the wires to each other and to obtain a structure having a certain rigidity without however making obstacle to the subsequent impregnation.
- a comparison step mentioned above is carried out by superimposing on the preform or blank a configuration of reference curved lines carried on a transparent support.
- a comparison step mentioned above is performed by optically raising said curved lines of the preform or blank, by creating a computer file from this record and comparing it with a corresponding computer reference file.
- FIG. 1 is a schematic view illustrating the 3D weave of the preform;
- FIG. 2 schematically illustrates the woven preform;
- FIG. 3 is a schematic view illustrating the effective shaping of said preform after weaving
- - Figure 4 is a schematic view illustrating the compaction
- - Figure 5 is a schematic view illustrating the impregnation.
- FIG. 1 illustrates the actual weaving of the blade with the aid of a Jacquard loom on which a bundle 12 of warp yarns or strands having, for example, 32 layers of several hundred threads each, has been arranged. .
- the mechanism is such that one can act on each of these son transversely to the warp son plies as shown, to insert the weft son 14.
- the 32 layers are involved in the weaving and then gradually, as the weaving of the blade decreases in thickness, a number of warp threads 12a are no longer woven, which makes it possible to obtain a preform of contour and desired thickness continuously variable.
- the preform 16 appears attached to the middle of an entanglement of two sets of warp and weft threads. The warp and weft threads are then cut off at the limit of the woven mass.
- the visibility of the cut ends 18 of at least some yarns is emphasized, which makes appear curved lines 20, in dotted lines, on the surface of the yarn. preform.
- curved lines 20 in dotted lines, on the surface of the yarn. preform.
- simply cutting the thread will bring out the end itself of a different color, namely the color of the carbon fiber.
- the preform 16 is remarkable in that the cut ends of the warp son dashed in a very visible manner, thanks to the color contrast.
- the process is continued by placing this preform 16, which is still malleable (because it is only a mass of threads entangled by the weave) in a shaping mold 23a which, for example, is the part bottom of a compaction mold 23a, 23b.
- a shaping mold 23a which, for example, is the part bottom of a compaction mold 23a, 23b.
- the image of the curved lines of a predetermined ideal preform can be projected onto the preform (projector 25).
- the operator can thus adjust the placement of the preform in the shaping mold 23a to match the pigmented lines of the preform with those that are projected. This is the result illustrated in Figure 3.
- the image of the preform 16 can be optically raised in the shaping mold, this image, and in particular that of the curved lines, translated into a computer file, and the contents of this file compared with that of a reference file representative of the curved lines of the reference blade.
- the next step, illustrated in Figure 4 is in either conventional. This is to achieve compaction and a first stiffening of the preform 16.
- the upper part 23b of the compaction mold is put in place.
- the mold is closed under pressure and with heating to carry out compaction with fusion of the sizing sleeves which allows to obtain a preform of a certain rigidity.
- the control operation can be renewed by again projecting a configuration of curved lines of an ideal preform (considered at this stage of its manufacture) to at least verify that the correct positioning of the preform n has not been affected by the compacting operation.
- the preform is selected and undergoes a machining that gives it its final form. If this is not the case, the impregnated preform is discarded.
- control operation that can be repeated at several stages of the process can also be carried out using at least one transparent support on which reference curve lines corresponding to those of a optimal dawn.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Textile Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Moulding By Coating Moulds (AREA)
- Woven Fabrics (AREA)
- Reinforced Plastic Materials (AREA)
- Treatment Of Fiber Materials (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09805732.6A EP2387497B1 (fr) | 2008-12-18 | 2009-12-17 | Procede de fabrication d'une aube de turbomachine |
RU2011129300/05A RU2515861C2 (ru) | 2008-12-18 | 2009-12-17 | Способ изготовления лопатки для газотурбинного двигателя |
CA2746708A CA2746708C (fr) | 2008-12-18 | 2009-12-17 | Procede de fabrication d'une aube de turbomachine |
JP2011541568A JP5666466B2 (ja) | 2008-12-18 | 2009-12-17 | タービンエンジン翼の製造方法 |
CN200980151563.8A CN102256773B (zh) | 2008-12-18 | 2009-12-17 | 涡轮发动机叶片的制造方法 |
US13/140,596 US8709314B2 (en) | 2008-12-18 | 2009-12-17 | Method for manufacturing a turbine engine vane |
BRPI0923147 BRPI0923147B1 (pt) | 2008-12-18 | 2009-12-17 | processo de fabricação de uma pá por tecelagem 3d de uma pré-forma |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0858763A FR2940172B1 (fr) | 2008-12-18 | 2008-12-18 | Procede de fabrication d'une aube de turbomachine |
FR0858763 | 2008-12-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010076513A1 true WO2010076513A1 (fr) | 2010-07-08 |
Family
ID=40874627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2009/052596 WO2010076513A1 (fr) | 2008-12-18 | 2009-12-17 | Procede de fabrication d'une aube de turbomachine |
Country Status (9)
Country | Link |
---|---|
US (1) | US8709314B2 (fr) |
EP (1) | EP2387497B1 (fr) |
JP (1) | JP5666466B2 (fr) |
CN (1) | CN102256773B (fr) |
BR (1) | BRPI0923147B1 (fr) |
CA (1) | CA2746708C (fr) |
FR (1) | FR2940172B1 (fr) |
RU (1) | RU2515861C2 (fr) |
WO (1) | WO2010076513A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104956090A (zh) * | 2013-02-13 | 2015-09-30 | 株式会社Ihi | 风扇叶片的制造方法及制造装置 |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2975035B1 (fr) * | 2011-05-10 | 2013-06-14 | Snecma | Moule de compactage et d'injection pour preforme fibreuse destinee a la fabrication d'une aube de redresseur de turbomachine en materiau composite |
FR2982518B1 (fr) * | 2011-11-15 | 2013-12-20 | Snecma | Conception d'une piece en materiau composite tisse 3d |
WO2013110895A1 (fr) * | 2012-01-25 | 2013-08-01 | Snecma | Méthode de fabrication d'une pale d'hélice en matériau composite |
FR2993191B1 (fr) * | 2012-07-16 | 2015-01-16 | Snecma | Procedes et systeme de decoupe |
FR3015552B1 (fr) * | 2013-12-19 | 2018-12-07 | Safran Aircraft Engines | Piece de turbomachine a surface non-axisymetrique |
DE102014216136A1 (de) * | 2014-08-13 | 2016-02-18 | Bayerische Motoren Werke Aktiengesellschaft | Verfahren für die Bestimmung eines Kernabschnitts eines Zuschnitts aus Faserverbundmaterial |
CN104385619B (zh) * | 2014-09-09 | 2017-07-04 | 西安航空动力股份有限公司 | 一种航空发动机复合材料风扇叶片的制造方法 |
FR3029134B1 (fr) * | 2014-12-02 | 2017-10-06 | Snecma | Procede de controle de position d'une preforme d'aube composite de turbomachine dans un moule |
CN104743087B (zh) * | 2015-03-26 | 2017-09-26 | 北京勤达远致新材料科技股份有限公司 | 一种船舶用三维编织复合材料螺旋桨叶片及其制备方法 |
CN106523430B (zh) * | 2015-09-11 | 2019-07-09 | 中国航发商用航空发动机有限责任公司 | 风扇叶片及其制备方法 |
WO2019133832A1 (fr) * | 2017-12-29 | 2019-07-04 | Tpi Composites, Inc. | Processus de superposition semi-automatisé pour la fabrication de pales d'éolienne à l'aide d'un système de projection optique |
FR3076814B1 (fr) * | 2018-01-12 | 2020-01-31 | Safran Aircraft Engines | Aube ou pale d'helice composite avec longeron integre pour aeronef |
US10859268B2 (en) | 2018-10-03 | 2020-12-08 | Rolls-Royce Plc | Ceramic matrix composite turbine vanes and vane ring assemblies |
CN109735996B (zh) * | 2018-12-21 | 2021-09-17 | 北京机科国创轻量化科学研究院有限公司 | 一种复合材料z向纤维低磨损三维成形方法 |
FR3096375B1 (fr) * | 2019-05-21 | 2021-04-30 | Safran Ceram | Texture fibreuse comprenant un fil de marquage et son procédé d’obtention |
US11162377B2 (en) | 2019-05-31 | 2021-11-02 | Rolls-Royce High Temperature Composites Inc. | Ceramic matrix composite turbine vane and method for making |
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US20030056847A1 (en) * | 2001-09-12 | 2003-03-27 | Schmidt Ronald P. | Woven preform for structural joints |
EP1777063A1 (fr) | 2005-10-21 | 2007-04-25 | Snecma | Procédé de fabrication d'une aube de turbomachine composite, et aube obtenue par ce procédé |
EP1916092A1 (fr) * | 2006-10-26 | 2008-04-30 | Snecma | Procédé de fabrication d'une aube témoin en matériau composite |
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RU2088764C1 (ru) * | 1993-12-02 | 1997-08-27 | Яков Петрович Гохштейн | Турбинная лопатка |
RU2099188C1 (ru) * | 1994-09-30 | 1997-12-20 | Акционерное общество "Центральный научно-исследовательский институт специального машиностроения" | Способ изготовления пустотелой композитной лопасти воздушного винта |
FR2736941B1 (fr) * | 1995-07-17 | 1997-09-12 | Aerospatiale | Procede et systeme pour la realisation d'une armature pour une piece de matiere composite |
JP4254158B2 (ja) * | 2001-08-20 | 2009-04-15 | 東レ株式会社 | 炭素繊維基材の製造方法、プリフォームの製造方法および複合材料の製造方法 |
JP2003127157A (ja) * | 2001-10-18 | 2003-05-08 | Toray Ind Inc | Rtm法によるfrp構造体の製造方法及びfrp構造体 |
DE10252671C1 (de) * | 2002-11-11 | 2003-12-04 | Mayer Malimo Textilmaschf | Verfahren zur Herstellung von faserverstärkten, dreidimensionalen Kunststoffteilen |
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CN1303949C (zh) | 2004-09-10 | 2007-03-14 | 北京工业大学 | 一种钛合金颅骨修复体制备方法 |
WO2008143557A1 (fr) * | 2007-05-24 | 2008-11-27 | Autoliv Development Ab | Tissu avec marqueurs tissés |
WO2011047167A1 (fr) * | 2009-10-16 | 2011-04-21 | Gerber Scientific International, Inc. | Procédés et systèmes pour fabriquer des parties composites |
-
2008
- 2008-12-18 FR FR0858763A patent/FR2940172B1/fr not_active Expired - Fee Related
-
2009
- 2009-12-17 JP JP2011541568A patent/JP5666466B2/ja active Active
- 2009-12-17 EP EP09805732.6A patent/EP2387497B1/fr active Active
- 2009-12-17 BR BRPI0923147 patent/BRPI0923147B1/pt active IP Right Grant
- 2009-12-17 RU RU2011129300/05A patent/RU2515861C2/ru active
- 2009-12-17 US US13/140,596 patent/US8709314B2/en active Active
- 2009-12-17 CA CA2746708A patent/CA2746708C/fr active Active
- 2009-12-17 WO PCT/FR2009/052596 patent/WO2010076513A1/fr active Application Filing
- 2009-12-17 CN CN200980151563.8A patent/CN102256773B/zh active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20030056847A1 (en) * | 2001-09-12 | 2003-03-27 | Schmidt Ronald P. | Woven preform for structural joints |
EP1777063A1 (fr) | 2005-10-21 | 2007-04-25 | Snecma | Procédé de fabrication d'une aube de turbomachine composite, et aube obtenue par ce procédé |
EP1916092A1 (fr) * | 2006-10-26 | 2008-04-30 | Snecma | Procédé de fabrication d'une aube témoin en matériau composite |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104956090A (zh) * | 2013-02-13 | 2015-09-30 | 株式会社Ihi | 风扇叶片的制造方法及制造装置 |
CN104956090B (zh) * | 2013-02-13 | 2017-09-26 | 株式会社Ihi | 风扇叶片的制造方法及制造装置 |
Also Published As
Publication number | Publication date |
---|---|
EP2387497A1 (fr) | 2011-11-23 |
BRPI0923147B1 (pt) | 2019-12-03 |
JP5666466B2 (ja) | 2015-02-12 |
CN102256773B (zh) | 2014-03-26 |
RU2011129300A (ru) | 2013-01-27 |
RU2515861C2 (ru) | 2014-05-20 |
JP2012512765A (ja) | 2012-06-07 |
EP2387497B1 (fr) | 2013-06-26 |
CA2746708C (fr) | 2017-06-20 |
US8709314B2 (en) | 2014-04-29 |
CA2746708A1 (fr) | 2010-07-08 |
US20110248416A1 (en) | 2011-10-13 |
FR2940172A1 (fr) | 2010-06-25 |
FR2940172B1 (fr) | 2011-01-21 |
CN102256773A (zh) | 2011-11-23 |
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