• 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:
    A method of manufacturing an annular coating (3) of a casing (1) of rotating blades of a turbomachine characterized in that it comprises the following steps: - fixing a support panel (2) annular on an inner face (10a) of the housing (1); - Fixing a plurality of ring sectors (31) forming annular sections comprising a first material obtained by polymerization of a second material on an inner contour (2a) of the support panel (2) with the interposition of a layer sizing (4) between the ring sectors (31) and the inner contour (2a) of said support panel (2), so as to provide an annular coating (3) on the inner contour (2a) of said panel support (2), the sizing layer (4) comprising the second material; - polymerization of the sizing layer (4).
    公开号:FR3074218A1
    申请号:FR1761339
    申请日:2017-11-29
    公开日:2019-05-31
    发明作者:David Marie Morice；Nicolas Francois Paul Broussais-Colella；Damien Bruno Lamouche；Vincent Bernard Serge MOST；Dimitri Germinal Soteras
    申请人:Safran Aircraft Engines SAS；
    IPC主号:
    专利说明:

    Invention background
    The present invention relates to the general field of coatings of rotary blade housings for turbomachines, and in particular for aircraft engines, and in particular abradable coatings.
    In order to ensure aerodynamic sealing between a rotor, such as the top of rotating blades, for example, and a stator, such as the casing surrounding said rotating blades, it is known to deposit an abradable coating by applying to the inner contour of the casing a layer of abradable material forming a track for the travel from the top of the blades along the casing. This solution is typically used for the fan casing of an aeronautical engine.
    By abradable is meant here the fact that the material is intended to wear out by abrasion upon contact with the blades.
    The abradable coating is eroded by the passage of the vanes during the running in of the engine, thus allowing the casing to conform to the actual shape of the tips of the vanes, and subsequently guaranteeing the seal between the rotor and the stator.
    It is known to produce the abradable seal by:
    - fixing of an annular support panel in a housing of the housing;
    - mixing and kneading by hand of two components so as to obtain a paste of a first material intended to become a layer of an abradable material after polymerization;
    - hand deposition of the paste on the internal contour of the support panel;
    - polymerization of the dough layer to create a track of abradable material;
    - the track of abradable material is machined to remove the surplus of deposited material.
    In addition, possible touch-ups may be necessary for the portions of the runway with defects. In this case, the following steps are carried out:
    - the track is dug;
    - the hollowed out areas are filled with polymerization paste;
    - Said paste is polymerized;
    - sanding is carried out to smooth the touched-up areas of the track.
    The manufacture of the abradable coating according to such a process takes a long time and encounters repeatability problems due to the manual deposition of the layer of the paste of abradable material. Indeed, for example air bubbles can be trapped when the layer of the paste of abradable material is deposited on the panel.
    In addition, manual deposition of the paste layer of abradable material is a painful operation for the operator which increases the risk of musculoskeletal disorders.
    Subject and summary of the invention
    The main object of the present invention is therefore to overcome such drawbacks by proposing a method for manufacturing an annular coating of a casing of rotating blades of a turbomachine, characterized in that it comprises the following steps:
    - El: fixing of an annular support panel on an internal face of the casing;
    - E2: fixing of a plurality of ring sectors forming annular sections comprising a first material obtained by polymerization of a second material on an internal contour of the support panel with the interposition of a sizing layer between the sectors d abradable ring and the internal contour of said support panel, so as to produce the annular coating on the internal contour of said support panel, the sizing layer comprising the second material;
    - E3: polymerization of the sizing layer.
    Such a method is particularly suitable for the manufacture of an abradable annular coating of a housing of rotating blades, such as for example a fan casing because the abradable materials are easy to manufacture by polymerization. However, the method according to the invention is not limited to the manufacture of an abradable coating, the method according to the invention can for example be used for the manufacture of an acoustic coating.
    The process can also include the following additional characteristics, taken alone or in combination according to the technically possible solutions:
    the annular coating is an abradable coating, the ring sectors being abradable ring sectors;
    - The support panel is fixed by fixing a plurality of annular portions placed end to end so that the support panel comprises junctions separating the annular portions from each other, the annular covering comprising junctions separating the sectors of ring between them, the junctions of the support panel and the junctions of the annular covering being angularly offset;
    - pressure is applied to the ring sectors during the polymerization of the sizing layer;
    each ring sector comprises an internal face, an external face, a first end and a second end, the first end and the second end of the ring sectors being bevelled so that the internal face projects circumferentially from the external face on the first end and that the external face projects circumferentially from the internal face on the second end;
    each ring sector comprises an internal face, an external face, a first end and a second end, the first end and the second end of the ring sectors being bevelled so that the external face projects circumferentially from the internal face on the first end and the second end;
    each ring sector comprises an internal face, an external face, a first end, and a second end, the ring sectors comprising a first group, the first end and the second end of which are bevelled so that the external face protrudes circumferentially from the inner face on the first end and on the second end, and a second group of which the first end and the second end are bevelled so that the inner face projects circumferentially from the outer face on the first end and on the second end ;
    each ring sector comprises an internal face, an external face, a first end and a second end, the first end and the second end of the ring sectors being perpendicular to the internal face and to the external face;
    each ring sector comprises an internal face and an external face, a surface treatment being carried out on the external face of the ring sectors;
    each ring sector comprises an internal face and an external face, the external face of the ring sectors comprising a roughness greater than the roughness of the internal face;
    the method further comprises the following step:
    - E4: deposition of a filling layer at the junctions between the ring sectors, the filling layer comprising the first material;
    - E5: polymerization of the filling layer.
    the method further comprises a step of supplying the plurality of ring sectors.
    According to another aspect, the invention proposes a casing of rotating blades of a turbomachine comprising an annular coating obtained according to the method according to one of the preceding characteristics, said casing comprising:
    - an annular support panel fixed to an internal face of the casing;
    a first layer of the first polymerized material situated on an internal contour of the support panel formed by the polymerized sizing layer;
    - A second layer of the first polymerized material formed by the plurality of ring sectors placed end to end so as to form the annular coating.
    Brief description of the drawings
    Other characteristics and advantages of the present invention will emerge from the description below, with reference to the appended drawings which illustrate an embodiment thereof devoid of any limiting character. In the figures:
    - Figure 1 shows a sectional view of a housing for rotating blades obtained according to a possible implementation of the method according to the invention;
    - Figure 2 schematically shows the steps of the method of manufacturing an annular coating of a housing of rotating blades of a turbomachine according to a possible implementation;
    - Figure 3 shows a first possible embodiment for the arrangement of ring sectors on the internal contour of the support panel;
    - Figure 4 shows a second possible embodiment for the arrangement of ring sectors on the internal contour of the support panel;
    - Figure 5 shows a third possible embodiment for the arrangement of ring sectors on the internal contour of the support panel;
    - Figure 6 shows a fourth possible embodiment for the arrangement of ring sectors on the internal contour of the support panel.
    Detailed description of the invention
    In the embodiment of the invention which is described, the annular coating is an abradable coating, but the invention is not limited to the manufacture of abradable coatings and can be used for the manufacture of other types of coating on a casing of rotating blades, in particular acoustic coatings.
    As illustrated in FIG. 1, a casing 1 of rotating blades of a turbomachine, typically a fan casing, comprises an annular wall 10 which has an internal face 10a on which is fixed an annular support panel 2. The support panel 2 can be fixed in a housing produced in the internal face 10a of the wall 10 of the casing.
    For simplification purposes, the portion of the casing 1 is shown in FIG. 1 is planar, but the casing 1 is a ring and the portion therefore has a radius of curvature.
    The support panel 2 comprises an external contour 2b fixed to the internal face 10a of the wall 10 of the casing, and an internal contour 2a opposite to the external contour 2b.
    An abradable annular coating 3, that is to say a coating made of a material adapted to be used by abrasion during contact with the blades, is located on the internal contour 2a of the support panel 2.
    According to another possible embodiment, the annular coating 3 is a foam obtained by polymerization which includes sound absorption and / or sound insulation properties. In this embodiment, the annular coating 3 can also be abradable thanks to the porosity of the foam.
    The abradable annular coating 3 is formed of a plurality of abradable ring sectors 31 which are placed end to end so as to form an annular track on the internal contour 2a of the support panel 2.
    The abradable ring sectors 31 are plates of abradable material comprising a first material obtained by polymerization of a second material. The second material may for example be a paste obtained by mixing a hardener and an epoxy resin loaded with a glass bead.
    The number of abradable ring sectors 31 may vary. The annular coating 3 may for example be formed by an assembly of 9 abradable ring sectors 31 each making a portion of 40 °.
    Furthermore, the abradable ring sectors 31 can have different lengths, as well as different radii of curvature, especially when the casing 1 has a slightly flattened ring shape over a portion.
    The abradable ring sectors 31 are fixed to the support panel 2 by a sizing layer 4 interposed between said abradable ring sectors 31 and the support panel 2. The sizing layer 4 comprises the second material. The gluing layer is polymerized in order to ensure the definitive fixing of the abradable ring sectors 31 on the support panel 2.
    Thus, the casing 1 comprises:
    - The support panel 2 fixed on the internal face 10a of the wall 10;
    - A first layer of the first material located on the internal contour, this first layer corresponding to the polymerized sizing layer 4;
    - A second layer of the first material located on the first layer of the first material and which is formed by the plurality of annular sectors 31 placed end to end so as to form the annular coating 3 forming an annular track for the tips of the blades.
    The casing 1 illustrated in FIG. 1 is obtained by the manufacturing process which comprises the following steps, as illustrated in FIG. 2:
    - El: fixing of the annular support panel 2 on the internal face 10a of the wall 10 of the casing 1;
    - E2: fixing of a plurality of ring sectors 31 forming annular sections comprising the first material obtained by polymerization of the second material on the internal contour 2a of the support panel 2 with interposition of the gluing layer 4 between the sectors ring 31 and the internal contour 2a of said support panel 2, so as to form the annular track on the internal contour 2a of said support panel 2, the sizing layer 4 comprising the second material;
    - E3: polymerization of the sizing layer 4.
    Furthermore, the annular coating 3 thus obtained can be machined if desired. However, this operation is made non-compulsory with the solution of the invention because the thickness of the coating 3 is controlled by the thickness of the ring sectors 31.
    The fact of forming the annular coating 3 using ring sectors 31 of the first material, and therefore already polymerized, makes it possible to eliminate the step of mixing, kneading and depositing a thick layer of paste of the second material, step likely to create musculoskeletal disorders for operators. Indeed, with the present invention, only a thin layer of paste of second material is deposited in order to form the sizing layer 4. The sizing layer 4 typically has a thickness of 1 mm.
    In addition, the fact that the ring sectors 31 and the sizing layer 4 are in the first material makes it possible to dispense with the step of redefining a new part, a step necessary when a new material is used. It also limits changes in the production chain.
    In addition, the ring sectors 31 are not weakened by the polymerization of the sizing layer 4, the ring sectors 31 being produced by polymerization of the second material.
    The fact that the support panel 2 is first fixed on the internal face 10a of the casing 1, then that the ring sectors 31 are fixed to the support panel 2 makes it possible not to stress the ring sectors 31 when the support panel 2 is deformed to conform to the shape of the internal face 10a of the casing 1.
    As illustrated in FIG. 1, the support panel 2 can be formed by a plurality of angular portions 21 placed end to end on the wall 10 of the casing 1 so as to constitute the ring of the support panel
    2. The support panel 2 therefore comprises junctions 22 between each annular portion 21.
    The annular coating 3 also includes junctions 32 between each ring sector 31.
    The junctions 22 of the support panel 2 and the junctions 32 of the annular covering 3 are angularly offset. Such an angular offset between the junctions 22 of the support panel 2 and the junctions 32 of the annular coating 3 makes it possible to improve the resistance of the annular coating 3, and thus limits the risk of cracking.
    Furthermore, to allow the ring sectors 31 to better match the shape of the support panel 2, it is possible to apply pressure against the ring sectors 31 so as to press them against the support panel 2 during step E3 of polymerization of the sizing layer 4. This can for example be carried out with a vacuum cover.
    It is also possible to reduce the length of the ring sectors 31 in order to allow said ring sectors 31 to better match the shape of the support panel 2. Thus, more ring sectors 31 are necessary to achieve the annular coating 3.
    As illustrated in FIG. 2, the method can also comprise the following steps:
    - E4: deposition of a filling layer 5 at the junctions between the ring sectors 31, the filling layer 5 comprising the second material;
    - E5: polymerization of the filling layer 5.
    Furthermore, the filling layer 5, once polymerized, can be machined in order to remove the surplus of second deposited material.
    The fact of depositing the filling layer 5 makes it possible to fill the interstices possibly existing between the different ring sectors 31, and thus makes it possible to smooth the coating 3.
    In addition, the polymerization of the sizing layer 4 and the polymerization of the filling layer 5 can be carried out at the same time in order to reduce the duration of the process, the steps E3 and E5 being thus carried out simultaneously.
    In addition, step E4 of depositing the filling layer 5 can be carried out during step E2 of fixing the ring sectors 31.
    As illustrated in FIGS. 3 to 6, different variants are possible concerning the shape of the ends of the ring sectors 31.
    The abradable ring sectors 31 each comprise an internal face 31a intended to be worn by abrasion during contact with the top of the blades, an external face 31b which is glued to the support panel 2 by the gluing layer 4, a first end 31c and a second end 31d.
    When fixing the ring sectors 31 on the panel 2, the first end 31c is placed opposite the second end 31d of an adjacent first ring sector 31, and the second end 31d is placed opposite the first end 31c of a second adjacent ring sector 31.
    In a first variant illustrated in FIG. 3, the ends 31c and 31d of the ring sectors 31 are bevelled so that:
    - On the first end 31c the internal face 31a projects circumferentially from the external face 31b; and
    - On the second end 31d, the external face 31b projects circumferentially from the internal face 31a.
    Such a variant makes it possible to obtain ring sectors 31 with a first end 31c which is complementary to the second end 31d, and thus allow an overlap of the adjacent ring sectors 31. It is therefore not necessary with this variant to deposit a filling layer 5 at the junctions of the ring sectors 31.
    In a second variant illustrated in FIG. 4, the ends 31c and 31d of the ring sectors 31 are bevelled so that, on the first end 31c and on the second end 31d, the external face 31b projects circumferentially from the internal face 31a .
    A recess 6 is thus created at each junction of the ring sectors 31, this recess 6 being formed by a spacing between the internal faces 31a of the ring sectors 31 at each end 31c, 3ld.
    The filling layer 5 can be deposited in the recesses 6.
    In a third variant illustrated in FIG. 5, the ring sectors 31 comprise two groups:
    a first group A of ring sectors 31 comprises the first and second ends 31c, 31d bevelled so that the external face 31b projects circumferentially from the internal face 31a on the first end 31c and on the second end 31d;
    - A second group B of ring sectors 31 comprises the first and second ends 31c, 31d bevelled so that the internal face 31a projects circumferentially from the external face 31b on the first end 31c and on the second end 31d.
    In a fourth variant illustrated in FIG. 6, the first end 31c and the second end 31d of the ring sectors 31 are perpendicular to the internal face 31a and to the external face 31b of said ring sectors 31.
    The variations on the shape of the ends of the ring sectors 31 described above are not limited to abradable ring sectors, but can be used with other types of ring sectors.
    As illustrated in FIG. 1, the support panel 2 can be formed of an annular structure 23 of honeycomb material which comprises an internal contour covered with a fabric 24 of composite material, such as for example a fabric carbon based.
    The support panel 2 is therefore fixed to the wall 10 of the casing 1 by the annular structure 23 of honeycomb material, and the sizing layer 4 is located against the fabric of composite material.
    According to a possible variant, the sizing layer 4 is deposited on the support panel 2, then the ring sectors 31 are deposited on the sizing layer 4.
    According to another variant, the sizing layer 4 is deposited on the ring sectors 31, said ring sectors 31 being disposed against the support panel 2 once glued.
    According to an additional variant, the sizing layer is deposited on the support panel 2 and on the ring sectors 31.
    Furthermore, in order to increase the strength of the fixing of the ring sectors 31 on the support panel 2, a surface treatment, or surface activation, can be carried out on the external face 31b of the ring sectors 31 so to increase its roughness. The external face 31b of the ring sectors 31 therefore comprises a roughness greater than the roughness of the internal face 31a.
    The external face 31b of the ring sectors 31 can for example be treated by sanding, by sanding, or by plasma treatment.
    The ring sectors 31 can also have a higher roughness on the external face 31b thanks to the use of a mold for the manufacture of the ring sectors 31 which creates a roughness difference between the internal face 31a and the external face 31b.
    The method can also comprise a step of supplying the plurality of ring sectors 31, this step being carried out before step E2 of fixing said plurality of ring sectors 31 on the internal contour 2a of the support panel 2.
    权利要求:
    Claims (12)
    [1" id="c-fr-0001]
    1. Method for manufacturing an annular coating (3) of a casing (1) of rotating blades of a turbomachine, characterized in that it comprises the following steps:
    (El): fixing of an annular support panel (2) on an internal face (10a) of the casing (1);
    - (E2): fixing of a plurality of ring sectors (31) forming annular sections comprising a first material obtained by polymerization of a second material on an internal contour (2a) of the support panel (2) with interposition a gluing layer (4) between the ring sectors (31) and the internal contour (2a) of said support panel (2), so as to produce the annular coating (3) on the internal contour (2a ) of said support panel (2), the sizing layer (4) comprising the second material;
    - (E3): polymerization of the sizing layer (4).
    [2" id="c-fr-0002]
    2. Method according to claim 1, wherein the annular coating (3) is an abradable coating, the ring sectors (31) being abradable ring sectors.
    [3" id="c-fr-0003]
    3. Method according to claim 1 or claim 2, wherein the fixing of the support panel (2) is carried out by fixing a plurality of annular portions (21) placed end to end so that the support panel (2 ) comprises junctions (22) separating the annular portions (21) therebetween, the annular covering (3) comprising junctions (32) separating the ring sectors (31) therebetween, the junctions (22) of the support panel (2) and the junctions (32) of the annular covering (3) being angularly offset.
    [4" id="c-fr-0004]
    4. Method according to any one of the preceding claims, in which a pressure is applied to the ring sectors (31) during the polymerization of the sizing layer (4).
    [5" id="c-fr-0005]
    5. Method according to any one of the preceding claims, in which each ring sector (31) comprises an internal face (31a), an external face (31b), a first end (31c) and a second end (31d) , the first end (31c) and the second end (31d) of the ring sectors (31) being bevelled so that the internal face (31a) projects circumferentially from the external face (31b) on the first end (31c) and that the external face (31b) projects circumferentially from the internal face (31a) on the second end (31d).
    [6" id="c-fr-0006]
    6. Method according to one of claims 1 to 4, wherein each ring sector (31) comprises an internal face (31a), an external face (31b), a first end (31c) and a second end (31d ), the first end (31c) and the second end (31d) of the ring sectors (31) being bevelled so that the external face (31b) projects circumferentially from the internal face (31a) on the first end (31c) and the second end (31d).
    [7" id="c-fr-0007]
    7. Method according to one of claims 1 to 4, in which each ring sector (31) comprises an internal face (31a), an external face (31b), a first end (31c), and a second end ( 31d), the ring sectors (31) comprising a first group (A), the first end (31c) and the second end (31d) of which are bevelled so that the external face (31b) projects circumferentially from the internal face ( 31a) on the first end (31c) and on the second end (31d), and a second group (B) whose first end (31c) and the second end (31d) are bevelled so that the internal face (31a) protrudes circumferentially from the external face (31b) on the first end (31c) and on the second end (31d).
    [8" id="c-fr-0008]
    8. Method according to one of claims 1 to 4, wherein each ring sector (31) comprises an internal face (31a), an external face (31b), a first end (31c) and a second end (31d ), the first end (31c) and the second end (31d) of the ring sectors (31) being perpendicular to the internal face (31a) and to the external face (31b).
    [9" id="c-fr-0009]
    9. Method according to any one of the preceding claims, in which each ring sector (31) comprises an internal face (31a) and an external face (31b), a surface treatment being carried out on the external face (31b) ring sectors (31).
    [10" id="c-fr-0010]
    10. Method according to any one of the preceding claims, in which the method further comprises the following step:
    - (E4): depositing a filling layer (5) at the junctions between the ring sectors, the filling layer comprising the second material;
    - (E5): polymerization of the filling layer.
    [11" id="c-fr-0011]
    The method of any one of the preceding claims, wherein the method further includes a step of providing the plurality of ring sectors (31).
    [12" id="c-fr-0012]
    12. Housing (1) of rotating blades of a turbomachine comprising an annular coating (3) obtained according to the method according to one of claims 1 to 11, said housing (1) comprising:
    - an annular support panel (2) fixed on an internal face of the casing (1);
    - a first layer of the first material located on an internal contour (2a) of the support panel (2) formed by the polymerized sizing layer (4);
    - A second layer of the first material formed by the plurality of ring sectors (31) placed end to end so as to form the annular coating (3).
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    同族专利:
    公开号 | 公开日
    FR3074218B1|2021-02-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3843278A|1973-06-04|1974-10-22|United Aircraft Corp|Abradable seal construction|
    FR2925118A1|2007-12-14|2009-06-19|Snecma Sa|ABRADABLE SUPPORT PANEL IN A TURBOMACHINE|
    EP2813672A1|2013-06-13|2014-12-17|Composite Industrie|Part of abradable material for manufacturing a sector of an abradable ring seal for a turbomachine and method for manufacturing such a part|
    WO2016203141A1|2015-06-18|2016-12-22|Safran Aircraft Engines|Device for coating a turbomachine annular casing|
    FR3048018A1|2016-02-22|2017-08-25|Snecma|DEVICE FOR APPLYING ABRADABLE MATERIAL TO A SURFACE OF A TURBOMACHINE CASING|FR3106611A1|2020-01-29|2021-07-30|Safran Aircraft Engines|AIRCRAFT TURBOMACHINE CASE AND ITS MANUFACTURING PROCESS|
    FR3106610A1|2020-01-29|2021-07-30|Safran Aircraft Engines|AIRCRAFT TURBOMACHINE CASE AND ITS MANUFACTURING PROCESS|
    FR3106612A1|2020-01-29|2021-07-30|Safran Aircraft Engines|AIRCRAFT TURBOMACHINE CASE AND ITS MANUFACTURING PROCESS|
    法律状态:
    2019-05-31| PLSC| Publication of the preliminary search report|Effective date: 20190531 |
    2019-10-22| PLFP| Fee payment|Year of fee payment: 3 |
    2020-10-21| PLFP| Fee payment|Year of fee payment: 4 |
    2021-10-20| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1761339|2017-11-29|
    FR1761339A|FR3074218B1|2017-11-29|2017-11-29|PROCESS FOR MANUFACTURING AN ANNULAR COATING FOR A TURBOMACHINE ROTATING BLADE CASING|FR1761339A| FR3074218B1|2017-11-29|2017-11-29|PROCESS FOR MANUFACTURING AN ANNULAR COATING FOR A TURBOMACHINE ROTATING BLADE CASING|
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