• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    FIBROUS PREFORM OF A TURBOMACHINE PADDLE MADE OF COMPOSITE MATERIAL WITH INTEGRATED PLATFORM, AND ITS PROCESS OF IMPLEMENTATION. The invention relates to a process of making a fibrous preform for the manufacture of a turbomachine blade made of composite material, the process comprising the realization by three-dimensional weave of a fibrous outline (100) made of a single piece with layers of threads longitudinal strands (c1 to c24) linked together by strands of transverse strand layers (t1 to t24), and the conformation of the fibrous outline to obtain a fibrous preform made of a single piece that has a first part that forms the preform of the blade and the hair least one part that forms the platform preform. In the course of the weave, threads (c5 to c7) from a first group of longitudinal threads are extracted from the fibrous outline on the side of one of the lateral faces (110a) of the outline to form a part (120) that corresponds to a platform preform of shovel, and threads (c3 and c4) of a second group of longitudinal threads are inserted into the fibrous outline with a mutual crossing between the threads of the first group and the threads of the second group. The invention also refers to (...).
    公开号:BR112014016859B1
    申请号:R112014016859-8
    申请日:2013-01-07
    公开日:2021-02-09
    发明作者:Bruno Jacques Gérard Dambrine；Dominique Coupe；Yann Marchal；Jean-Noël MAHIEU
    申请人:Snecma；
    IPC主号:
    专利说明:

    Background of the invention
    [0001] The present invention relates to the realization of a fibrous pad preform equipped with at least one platform, notably for the manufacture of a turbomachine blade made of composite material.
    [0002] Blades made of composite material for turbomachinery have already been proposed. It will be possible to refer, for example, to the document EP 1 526 285 which describes the manufacture of a fan blade by carrying out a fibrous preform by three-dimensional weave and densification of the preform by an organic matrix.
    [0003] On the other hand, a turbomachinery fan comprises platforms that are arranged between the blades in order to delimit, on the inside side, the annular flow path of air entering the fan, that flow path being delimited on the outside by a sump. These platforms can be adapted separately or integrated directly into the base of the fan blades, between the column that extends their foot and the blade of the latter. The invention is particularly interested in the blades that belong to this second category, that is, the integrated platform (s). Object and summary of the invention
    [0004] It is therefore desirable to be able to have turbomachine blades with integrated platform (s) made of composite material, notably, but not exclusively, made of composite material of organic matrix (CMO).
    [0005] For this purpose, according to the invention, it is proposed a process for making a fibrous preform for the manufacture of a turbomachine blade made of composite material, the blade having a blade that extends according to a longitudinal direction and which has two opposite side faces and at least one platform that extends from a side face, the process comprising: the realization by three-dimensional weave of a fibrous outline made of a single piece with a plurality of layers of longitudinal threads that extend in a direction corresponding to the longitudinal direction of the blade to be manufactured and which are connected together by threads of a plurality of layers of transversal threads; and the conformation (“mise en forme”, in French) of the fibrous outline to obtain a fibrous preform made of a single piece that has a first part that forms a blade preform and at least a second part that forms a platform preform; in the course of weaving the fibrous outline, threads from a first group of longitudinal threads are extracted from the fibrous outline on the side of at least one of the side faces of the fibrous outline to form a portion of the outline that corresponds to a paddle platform preform, and threads of a second group of longitudinal threads are inserted into the fibrous outline with a mutual crossing between the threads of the first group and the threads of the second group.
    [0006] During the course of the weave a cross between threads extracted from the fibrous outline and threads inserted in the latter, it is possible to obtain a fibrous preform made of a single piece by three-dimensional weave with a part that forms a blade preform and another part that forms the platform preform while maintaining a constant fiber rate in the fibrous outline despite the extraction of the strands of the first group.
    [0007] A continuity of fibers is also ensured between the part of the preform that forms the blade and the part that forms the platform, which allows to check the mechanical properties required for a blade with integrated platform.
    [0008] According to a particular feature of the process, the crossing between the wires of the first group and the wires of the second group is carried out in the proximity of a connection between the part of the sketch that corresponds to the paddle platform preform and the part of the sketch that corresponds to the blade preform.
    [0009] Preferably, the yarns of the second group of yarns that are inserted in the fibrous outline come from layers of longitudinal threads previously extracted from the fibrous outline in order to obtain a reduction in the thickness of the outline in its width. Layers of wires can in fact be extracted from the sketch to take into account the reduction of the thickness of the blade profile (from the foot towards the top of the blade). The use of them to create the platform is, therefore, especially advantageous since it avoids wasting them.
    [0010] In this case, the conformation of the fibrous outline advantageously comprises the cutting of the portion of the threads of the second group of threads located between the extraction and insertion zones in the fibrous outline. In addition, at least some of the strands of the second group of strands can be extracted from the fibrous outline downstream of the insertion zone of them in said fibrous outline in order to obtain a reduction in the thickness of the outline in its width downstream of the portion of the outline that corresponds to the paddle platform preform.
    [0011] When the blade profile of the blade does not show a reduction in its thickness between the foot and the top of the blade, or when this thickness reduction does not allow having a sufficient amount of wires to form the blade platform, at least some the yarns of the second group of yarns that are inserted in the fibrous outline can come from adapted longitudinal yarn layers.
    [0012] According to another peculiarity of the process, the extraction and insertion of threads in the fibrous outline are carried out for each of the lateral faces of the fibrous outline to form a part of the outline that corresponds to two paddle platform preforms. In this case, the blade that will be manufactured will have two platforms on each side (soffit and extruder).
    [0013] According to yet another peculiarity of the process, the conformation of the fibrous outline comprises the cutting of the part of the outline that corresponds to the blade platform preform in the desired dimensions and the extension of that part of the outline according to a substantially orthogonal direction its side face.
    [0014] The longitudinal threads that extend in a direction that corresponds to the longitudinal direction of the blade to be manufactured can be warp threads. Alternatively, the longitudinal threads that extend in a direction that corresponds to the longitudinal direction of the blade to be manufactured can be weft threads.
    [0015] The invention also has as its object a fibrous preform of a turbomachine blade that has a blade that extends according to a longitudinal direction and that has two opposite side faces and at least one platform that extends from one face lateral, the preform comprising a fibrous outline woven in one piece by three-dimensional weaving with a plurality of layers of longitudinal threads that extend in a direction that corresponds to the longitudinal direction of the blade to be manufactured and that are connected together by threads of a plurality of layers of transverse threads, and in which, according to the invention, threads from a first group of longitudinal threads are extracted from the fibrous outline on the side of at least one of the side faces of the fibrous outline to form a portion of the outline corresponding to a paddle platform preform, and wires from a second group of longitudinal wires are inserted into the fibrous outline with a mutual crossing between the wires of the first group and the wires of the second group.
    [0016] The invention also has as its object a turbocharger fan blade made of composite material that comprises a fibrous preform as defined above and densified by a matrix. The invention further has as its object a turbocharger fan comprising at least one such blade. Brief description of the drawings
    [0017] Other features and advantages of the present invention will stand out from the description made below, with reference to the accompanying drawings that illustrate examples of realization of the same devoid of any limiting character. In the figures:
    [0018] - figure 1 is a perspective view of a turbocharger fan blade with two integrated platforms;
    [0019] - figure 2 illustrates in a very schematic way the arrangement of the layers of wires in a fibrous 3D fabric sketch intended for the realization of a fan blade such as the one in figure 1;
    [0020] - figure 3 is a schematic view of a warp plane showing a way of weaving the fibrous outline of figure 2; and
    [0021] - figure 4 is a schematic view of a warp plane showing another way of weaving for the realization of a fibrous outline according to a variant of the invention. Detailed description of the invention
    [0022] The invention is applicable to the manufacture of any turbomachine blade with integrated platform (s) made of composite material, and notably, but not exclusively, to fan blades such as the one illustrated in figure 1.
    [0023] The paddle 10 of figure 1 comprises, in a manner well known in itself, a blade 20, a foot 30 formed by a part of greater thickness, for example, with a bulbous section, extended by a column 32, and two platforms 40 located between the column 32 and the blade 20.
    [0024] The blade 20 extends in the longitudinal direction between the platforms 40 and the top of the blade 22 and presents in cross section a curved profile of variable thickness between its two opposite lateral edges (ie its leading edge 24 and its trailing edge 26).
    [0025] In its inner radial end, the blade 20 joins the platforms 40 on an external face of the latter, which delimit the annular flow path of the air entering the fan on the inside, this flow path being delimited on the outer side. by a sump (not shown).
    [0026] In the example of figure 1, the blade 10 thus presents two platforms 40 that extend from the lateral faces (soffit face 20a and outward face 20b) of the blade 20. Of course, the invention also applies to blades that only comprise a single platform (which would extend, for example, from the extrados face of the blade, the soffit face being devoid of a platform as far as it is concerned).
    [0027] Figure 2 shows the arrangement of the layers of wires in a fibrous sketch 100 3D fabric intended for making a fan blade like the one in figure 1.
    [0028] The fibrous outline 100 comprises a central part 110 which forms preform of blade and foot and two lateral parts 120 intended to form, after forming, platform preforms. These parts 110 and 120 of the sketch generally extend in the X direction which corresponds to the longitudinal direction of the blade to be carried out. In this figure, only the wrappers of these two parts are represented.
    [0029] The central part 110 comprises two opposite side faces 110a, 110b from which the two side parts 120 extend. In the case of making a fan blade with a single platform, only one of these parts would be present.
    [0030] The central part 110 has, in its part 112 intended to form a preform of foot, an over-thickness (between the lateral faces 110a, 110b) determined according to the thickness of the foot of the blade to be carried out. In its part 114 intended to form a blade preform, the central part 110 has a variable thickness determined according to the thickness of the blade profile of the blade to be carried out.
    [0031] Briefly, a fibrous preform having a shape close to that of the fan blade to be manufactured can be obtained from such a fibrous outline 100 in the following way. After a quality control, the fibrous outline 100 is cut in the plane so that all woven over-lengths are eliminated and the part is in the dimensions of the injection mold. This cutting step refers in particular to part 112 of the sketch intended to form a standing preform, to the central part 110 which forms a blade preform at the level of its leading edge, its trailing edge and its top, and the end of the side parts 120 intended to form platform preforms.
    [0032] Once the cuts have been made, the outline is formed by placing it on the plane and lifting one of the lateral parts to position it at 90 ° in relation to the corresponding lateral face of the central part. This position is blocked and the preform overturned. The central part of the sketch is then deformed to reproduce to reproduce the curved profile of the blade. And then, the other side part is extended 90 ° in relation to the corresponding side face of the central part. Thus, a fibrous preform is obtained made of a single piece with a part that forms a preform of blade and foot and two parts that form platform preforms. The fibrous preform thus obtained is then dried and placed in place within the injection mold.
    [0033] The placement of the matrix in the fibrous preform is carried out keeping the preform inside the mold at least until the preform is stiffened (or consolidated). The matrix is chosen according to the application considered, for example, an organic matrix obtained mainly from a polymeric matrix precursor resin such as an epoxy, bismaleimide or polyimide resin, or a matrix made of carbon or a matrix made of pottery. In the case of an organic matrix, the fibrous preform is impregnated by a composition containing the matrix precursor resin, before conformation (“conformation” in French) in a tool, or after conformation, the impregnation being carried out in the latter case, for example, by infusion or by an RTM type process (“Resin Transfer Molding”). In the case of a matrix made of carbon or made of ceramic, densification can be carried out by chemical infiltration in a gas phase, or CVI (“Chemical Vapor Infiltration”) or by impregnation by a liquid composition containing a precursor resin of carbon or carbon. ceramics and thermal treatment of pyrolysis or ceramization of the precursor, these processes being well known in themselves.
    [0034] Three-dimensional weaving modes of the fibrous outline 100 will now be described in more detail.
    [0035] It is assumed that the weave is made with warp threads that extend in the longitudinal X direction of the sketch, being noted that a weave with weft threads in this direction is also possible.
    [0036] Figure 3 shows a warp plane of a fibrous outline 100 three-dimensional fabric intended for making a fibrous preform such as that of figure 2. By warp plane of the fibrous outline, here is understood a plane perpendicular to the weft threads which contains a column of warp threads (in this figure 3, the continuous lines represent the warp threads).
    [0037] At the level of its part 112 intended to form a preform of foot, the fibrous outline comprises, between its opposite side faces 110a, 110b, for example, 24 layers of warp threads c1 to c24 and the same number of layers of frame t1 to t24. In this part 112, the weave reinforcement is of the interlock type with a satin weave for the warp threads c1 and c24 in the parts adjacent to the opposite side faces 110a, 110b. A 3D weave of a fibrous structure with a core interlock type armor and a satin leather 2D or 3D armor is known in itself. It will be possible to refer to document WO 2006/136755.
    [0038] At the level of part 114 intended to form a blade preform, the thickness of the fibrous outline between its side faces 110a, 110b is variable. So that, in order to take into account this thinning of the blade profile to be manufactured, layers of warp threads and the same number of weft threads from the fibrous outline are regularly removed. In the example in figure 3, it is the warp threads c2, c3 and c4 that are successively removed on the side face 110a, and the warp threads c23, c22 and c21 that are successively removed on the side of the opposite side 110b . This manipulation, which consists of removing threads during the weaving of the fibrous outline, is known in itself. It will be possible to refer to the document EP 1 528 285.
    [0039] At the level of an area 116 of part 114 of the fibrous outline, the side parts 120 are designed for preformed platform forms. For this purpose, layers of warp yarns are removed from the fibrous outline on the side of each side face and woven with a few layers of weft yarns. In the example in figure 3, these are the adjacent warp yarns c5 to c7 which are removed on the side face side 110a and woven with weft threads t1 to t3 to form one of the side parts 120. Likewise, the yarns adjacent warp threads c18 to c20 are removed on the side of the other side face 110b and woven with weft threads t22 to t24 to form the other of the side parts 120. Separations are arranged between the layers of warp threads that form the parts 120 and the layers of warp yarns of part 114 intended to form a foil preform.
    [0040] On the other hand, to maintain a constant rate of fibers in the fibrous outline despite the removal of those warp threads intended to form the side parts 120, at least some of the warp threads removed from the fibrous outline to take into account the degressivity of the thickness of the blade profile are reintroduced into part 114 of the fibrous outline at the level of zone 116 (here the warp threads c3 and c4 on the side face 110a and c21, c22 and c23 on the side face 110b). Thus, these warp threads cross the warp threads c5 to c7 (on the side face 110a) and c18 to c20 (on the side face 110b), preferably at the level of the connections between part 114 that corresponds to the preform blade and the side parts 120 which corresponds to the platform preforms.
    [0041] Thus, the warp threads c3 and c4 on the side face 110a and c21, c22 and c23 on the side face 110b are left floating (meaning that they remain on the surface of the fibrous outline without being intertwined with the weft threads) between its extraction zone of part 114 of the fibrous outline and its reintroduction zone 116 in the latter. If degressivity of the thickness of the blade profile so requires, at least some of these warp threads can be extracted again further downstream of part 114 of the fibrous outline. In the example in figure 3, this is the case for warp threads c3, c21, c22 and c23. In the subsequent stage of shaping the fibrous outline, the portion of these warp threads c3, c21, c22 and c23 located between the extraction and insertion zones of them in the fibrous outline is cut.
    [0042] Figure 3 represents an example of carrying out the crossing between the warp yarns reintroduced in part 144 of the fibrous outline at the level of zone 116 and the warp yarns extracted from the latter to weave the side parts 120 intended to form platform preforms . Of course, other known types of crosses can be used, notably in order to avoid too brutal crossings.
    [0043] Figure 4 shows a warp plane of a fibrous outline 100 'intended for making a fibrous preform of a turbomachine fan blade and made according to another way of weaving.
    [0044] In this other example, the blade profile of the blade to be manufactured does not show degressivity of its thickness, at least in the lower part of the blade that extends beyond the platforms (the thickness remains constant).
    [0045] At the level of its part 112 'intended to form a standing preform, the fibrous outline 100' comprises, between its opposite side faces 110'a, 110'b, 24 layers of warp threads c1 to c24 and the same number of weft layers t1 to t24. In that part 112 ', the weave armature is of the interlock type with a satin weave for the warp threads c1 and c24 in the parts adjacent to the opposite side faces.
    [0046] At the level of the part 114 'intended to form a blade preform, the thickness of the fibrous outline between its side faces 110'a, 110'b remains constant, so that no extraction of the layer of threads is carried out.
    [0047] As for the example described above, at the level of a region 116 'of part 114' of the fibrous outline the side parts 120 'are woven to form platform preforms. For that purpose, in the example of figure 4, the adjacent warp threads c5 to c7 are removed on the side face side 110'a and woven with the weft threads t1 to t3 to form one of the side parts 120 '. Likewise, adjacent warp yarns c18 to c20 are removed on the side of the other side face 110'b and woven with weft threads t22 to t24 to form the other side 120 '.
    [0048] In order to maintain a constant rate of fibers in the fibrous outline despite the removal of those warp threads intended to form the side parts 120 ', adapted warp threads c'1 to c'3 and c'21 to c'23 are introduced in part 114 'of the fibrous outline at the level of zone 116'. Thus, these warp threads cross the warp threads c5 to c7 (on the side face 110'a) and c18 to c20 (on the side face 110'b), preferably at the level of the connections between part 114 'which corresponds to the blade preform and the side parts 120' which corresponds to the platform preforms.
    [0049] Other variants of weaving the fibrous outline according to the invention can be considered.
    [0050] Notably, in the case where the blade to be manufactured only has a single platform, the extraction of layers of threads to weave the preform of the latter will only be operated on the side of one of the side faces of the fibrous outline. This solution allows more flexibility if only a few layers of yarn are available to weave this platform preform.
    [0051] It is also possible to make a fibrous preform that has half-platform preforms that extend from its lateral faces. In that case, the half platforms of the blade manufactured from such a preform do not entirely cover the spacing between two adjacent blades and it is necessary to independently make the missing half platforms. The realization of the latter is, however, relatively easy since the weaving of the latter does not need to take into account the curvature of the blade.
    [0052] According to a weaving alternative of figure 3, the thickness variation of the blade of the blade to be manufactured can be obtained using weft yarns of variable title. This alternative makes it possible to avoid having to extract layers of threads from the fibrous outline to reintroduce them a little further downstream.
    [0053] According to another alternative for weaving the fibrous outline, it is possible to unfold the warp threads of platform preforms and weave them side by side in order to facilitate their extraction from the fibrous outline in the precise location of the positioning of the platforms.
    权利要求:
    Claims (15)
    [0001]
    1. Process of making a fibrous preform for the manufacture of a turbomachine blade made of composite material, the blade (10) having a blade (20) that extends in a longitudinal direction and that has two opposite side faces (24, 26) and at least one platform (40) extending from a side face, the process comprising: the three-dimensional weaving of a fibrous outline (100, 100 ') made in one piece with a plurality of layers of longitudinal threads (c1 to c24) that extend in a direction that corresponds to the longitudinal direction of the blade to be manufactured and that are connected together by threads of a plurality of layers of transversal threads (t1 to t24); and conformation of the fibrous outline to obtain a fibrous preform made of a single piece that has a first part that forms a blade preform and at least a second part that forms a platform preform; characterized by the fact that, during the weaving of the fibrous outline, threads (c5 to c7, c18 to c20) of a first group of longitudinal threads are extracted from the fibrous outline on the side of at least one of the lateral faces (110a, 110b) of the fibrous outline to form a part (120) of the outline corresponding to a paddle platform preform, and threads (c3, c4, c21, c22 and c23; c'1 to c'3) of a second group of longitudinal threads are inserted in the fibrous outline with a mutual crossing between the wires of the first group and the wires of the second group.
    [0002]
    2. Process, according to claim 1, characterized by the fact that the crossing between the wires of the first group and the wires of the second group is carried out in the proximity of a connection between the part of the sketch that corresponds to the paddle platform preform and the part of the sketch that corresponds to the blade preform.
    [0003]
    3. Process according to claim 1 or 2, characterized by the fact that the yarns of the second group of yarns that are inserted in the fibrous outline come from layers of longitudinal threads previously extracted from the fibrous outline in order to obtain a reduction in the thickness of the outline about its width.
    [0004]
    4. Process according to claim 3, characterized in that the conformation of the fibrous outline comprises cutting the portion of the threads of the second group of threads located between the extraction and insertion zones in the fibrous outline.
    [0005]
    5. Process according to claim 3 or 4, characterized by the fact that at least some of the yarns of the second group of yarns are extracted from the fibrous outline downstream of the insertion zone of them in said fibrous outline in order to obtain a reduction of the thickness of the sketch over its width downstream of the part of the sketch that corresponds to the paddle platform preform.
    [0006]
    6. Process according to claim 1 or 2, characterized by the fact that at least some of the yarns of the second group of yarns that are inserted in the fibrous outline come from adapted longitudinal yarn layers.
    [0007]
    Process according to any one of claims 1 to 6, characterized in that the extraction and insertion of threads in the fibrous outline are carried out for each of the lateral faces of the fibrous outline to form a part of the outline corresponding to two paddle platform preforms.
    [0008]
    8. Process according to any one of claims 1 to 7, characterized in that the conformation of the fibrous outline comprises the cutting of the part of the outline corresponding to the paddle platform preform in the desired dimensions and the extension of that part of the outline in a direction substantially orthogonal to its lateral face.
    [0009]
    Process according to any one of claims 1 to 8, characterized in that the longitudinal threads that extend in a direction that corresponds to the longitudinal direction of the blade to be manufactured are warp threads.
    [0010]
    Process according to any one of claims 1 to 8, characterized in that the longitudinal threads that extend in a direction that corresponds to the longitudinal direction of the blade to be manufactured are weft threads.
    [0011]
    11. Fibrous preform of a turbomachine blade (10) that has a blade (20) that extends in a longitudinal direction and that has two opposite side faces (24, 26) and at least one platform (40) that extends to from a side face, the preform comprising a fibrous outline (100; 100 ') woven in one piece by three-dimensional weave with a plurality of layers of longitudinal threads (c1 to c24) extending in a direction corresponding to the longitudinal direction of the blade to be manufactured and which are connected together by threads of a plurality of layers of transversal threads (ti to t24), characterized by the fact that threads (c5 to c7, c18 to c20) of a first group of longitudinal threads are extracted of the fibrous outline on the side of at least one of the side faces (ii0a, ii0b) of the fibrous outline to form a part (i20) of the outline that corresponds to a pad platform preform, and wires (c3, c4, c2i, c22 and c23; c'i to c'3) of a second group of longitudinal threads are ins in the fibrous outline with a mutual crossing between the wires of the first group and the wires of the second group.
    [0012]
    12. Preform, according to claim 11, characterized by the fact that the crossing between the wires of the first group and the wires of the second group is located in the proximity of a connection between the part of the sketch that corresponds to the paddle platform preform and the part of the sketch that corresponds to the blade preform.
    [0013]
    13. Preform according to claim 11 or 12, characterized in that the extraction and insertion of threads in the fibrous outline are carried out for each side of the fibrous outline to form a part of the outline corresponding to two preforms paddle platform.
    [0014]
    14. Turbomachine fan blade made of composite material characterized by the fact that it comprises a fibrous preform as defined in any one of claims 11 to 13 densified by a matrix.
    [0015]
    15. Turbomachine fan characterized by the fact that it comprises at least one blade as defined in claim 14.
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    同族专利:
    公开号 | 公开日
    WO2013104852A3|2014-02-20|
    CN104040056A|2014-09-10|
    CN104040056B|2016-05-04|
    CA2862685C|2020-03-10|
    EP2802701A2|2014-11-19|
    EP2802701B1|2016-11-16|
    IN2014DN05637A|2015-04-03|
    WO2013104852A2|2013-07-18|
    BR112014016859A8|2017-07-04|
    JP2015509159A|2015-03-26|
    BR112014016859A2|2017-06-13|
    RU2612628C2|2017-03-09|
    RU2014132876A|2016-02-27|
    JP6038178B2|2016-12-07|
    CA2862685A1|2013-07-18|
    US20140369848A1|2014-12-18|
    US9771810B2|2017-09-26|
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    法律状态:
    2018-03-27| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-08-27| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-12-08| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-02-09| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 07/01/2013, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201261584406P| true| 2012-01-09|2012-01-09|
    US61/584,406|2012-01-09|
    PCT/FR2013/050026|WO2013104852A2|2012-01-09|2013-01-07|Fibrous preform of a turbomachine blade made of composite material with in-built platform, and method of producing same|
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