• 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:
    The invention relates to a blade manufacturing process for turbomachines which is simpler to implement and which limits the risk of defects appearing on the functional areas of the blades. In particular, according to one aspect, there is provided a method for producing a ceramic core assembly for the manufacture by molding of a turbomachine blade, according to which several subsets of cores are produced and these different subassemblies are assembled. -assemblies between them, as well as with a core which is a bath or foot core, characterized in that a subset of cores is made by molding in a single injection operation at least two ceramic cores, the two cores of the subassembly obtained at the end of this operation being interconnected by a ceramic junction, and in that different subassemblies made in this way are then assembled to the bath or foot core.
    公开号:FR3022811A1
    申请号:FR1456175
    申请日:2014-06-30
    公开日:2016-01-01
    发明作者:Brou De Cuissart Sebastien Digard；Stephanie Deflandre；Charlotte Marie Dujol；Patrice Eneau；Didier Maurice Marceau Guerche
    申请人:SNECMA SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to turbomachine blades. More specifically, it relates to the realization of an assembly of ceramic cores for the manufacture by molding of a turbomachine blade. GENERAL TECHNICAL FIELD AND STATE OF THE ART The trend among aeronautical motorists is to engines that are more efficient and less fuel-efficient. This induces the need to design "new generation" high-pressure turbine blades, of smaller and smaller size, and resistant to increasingly important thermal and mechanical stresses (temperature, pressure, speed of rotation, etc.). These liquidus boundary temperatures, regardless of the metal used, require room-internal cooling circuit design, whose geometrical space becomes increasingly limited. It is in these conditions more efficient to design cooling circuits with several cavities in the thickness. Such structures are composed of an assembly of massive central cores and fine peripherals which are assembled so that, in the long run, after a casting step by injection of a metal layer around the cores followed by a step of dissolving the nuclei by a chemical attack, the central nuclei form large central cavities and the peripheral nuclei form fine extrados or intrados cavities.
    [0002] In order to manufacture such circuits, it is known to manufacture, in isolation, a solid central core on which peripheral cores constituted by thin plates are assembled. However, these assemblies between the central core and the fine peripheral cores are necessarily made in the functional part of the circuit. In case of no mastery of the assembly, one obtains defects of the type "flash-metal" (according to the English terminology), or other defects that impact the functionality of the circuit and are difficult to control. Cooling circuits are also known for which the intrados and extrados cavities are not connected to the central cavity, thus eliminating the need for an assembly step between the solid central core and peripheral cores consisting of thin plates. In these circuits, the following difficulties are encountered: - a complicated assembly because it requires the manipulation of the very thin and slender plates of the peripheral cores, which leads to an arduous control of interstices between the cores, which will eventually be metal thicknesses, - impossibility of making junctions for the very thin plates (0.3 mm to 1.5 mm) with alumina rods inserted in the extension of the thickness, thus forcing to exceed said very thin plates in the part bath and then reseal these slots, - complex descents to master because it is also necessary to maintain the very thin plates in the dawn foot part. In addition, this configuration of the cooling circuit imposes a core composed of several assembled parts with the associated risks: - need for a high degree of accuracy in positioning and maintaining the position of the cores during the entire manufacturing process of the dawn, - metallurgical defect in the functional area of the circuit in the event of a bad connection. GENERAL PRESENTATION OF THE INVENTION A general object of the invention is to propose a method of manufacturing blades for turbomachines which is simpler to implement and which limits the risk of defects appearing on the functional areas of the blades. In particular, according to one aspect, there is provided a method for producing a ceramic core assembly for the manufacture by molding of a turbomachine blade, according to which several subsets of cores are produced and these different subassemblies are assembled. -assemblies between them, as well as with a core which is a bath or foot core, characterized in that a subset of cores is made by molding in a single injection operation at least two ceramic cores, the two cores of the subassembly obtained at the end of this operation being interconnected by a ceramic junction, and in that different sub-assemblies made in this way are then assembled to the bath or foot core.
    [0003] In another aspect, during the production of a subset of cores, ceramic rods are arranged between the mold parts corresponding to the two cores, prior to the injection of ceramic paste. According to an additional aspect, the junction between the two cores of at least one subset of cores is achieved by a ceramic joint wall, molded with the two cores. According to a further aspect, a subset of cores comprises on the one hand a main core intended to correspond to a main cavity for circulating the cooling air of the blade and on the other hand a peripheral core 10 intended to correspond to to a thin cavity along the edges of the dawn. In another aspect, at least one peripheral core constitutes a lower surface core or an extrados core. According to an additional aspect, at least one tub or foot core is assembled at least with the following different subsets: a first subassembly which comprises a first central core connected to a leading edge core; second subassembly which comprises a second central core connected to an extrados core; - a third subassembly which comprises a third central core connected to a lower surface core; and - a fourth subassembly which comprises a fourth subassembly central core connected to a trailing edge. In a particular aspect, the assembly of the different subsets with the bath core and the foot core is performed in non-functional areas of the blade. In a further aspect, the leading edge core is connected to the single bath core. In another aspect, the junction of the four center cores with the bath core, and the junction of the leading edge core with the bath core, is performed with quartz rods, or silica, or preferably alumina. According to an additional aspect, at least one peripheral core forms a plate having a thickness of between 0.3 mm and 1.5 mm. DESCRIPTION OF THE FIGURES Other characteristics, objects and advantages of the present invention will appear on reading the detailed description which follows, and with reference to the appended drawings, given as non-limiting examples and in which: FIG. 1 represents a perspective view of a core at the outlet of an injection mold according to a first implementation of the invention; FIG. 2 represents a perspective view of a core at the outlet of an injection mold according to a second implementation of the invention; - Figure 3 shows a perspective view of a core assembly; FIG. 4 represents a front view of the assembly of cores represented in FIG. 3 which is connected to a bath core and to a foot core, and in which the intrados and extrados cores are not represented; - Figure 5 shows a sectional view of Figure 4 at the axis A-A.
    [0004] DESCRIPTION OF ONE OR MORE EXAMPLES OF IMPLEMENTATION FIG. 1 shows a ceramic sub-assembly 1 comprising two cores 10 and 20. In this example, the central core 10 is larger than the peripheral core 20 which is a thin plate whose thickness can vary between 0.3 mm and 1.5 mm.
    [0005] The central core 10 and the peripheral core 20 are made in the same step, by injecting a ceramic paste into an injection mold. Prior to this injection, ceramic rods 31 are put in place between the two parts of the mold which correspond to this central core 10 and the peripheral core 20. These ceramic rods 31 previously put in place ensure the junction between the two cores 10 and 20. After the casting step, these ceramic rods 31 will give way to multiple channels connecting the two cavities corresponding to the cores 10 and 20. It will be noted that the fact that the injection of the ceramic paste in the cores 10 and 20 is performed in a single step reduces the risk of occurrence of defects due to post injection assembly between a central core 10 and a separate peripheral core 20.
    [0006] As a variant (FIG. 2 - subset of cores 2), the junction between the central core 10 and the peripheral core 20 can be achieved by a connecting wall (wall 32) formed during the step of injecting the paste of ceramic in the injection mold.
    [0007] Such a junction by a wall 32 allows to create in the blade a single communication channel between the cavity that will be created by the central core 10 and that of the peripheral core 20. An assembly 3 comprising several subsets of cores obtained from the described above is illustrated in Figures 3 to 5.
    [0008] In the example illustrated in these figures, the assembly 3 comprises, from the leading edge to the trailing edge: a leading edge core 5; a first central core 11 which is made in the same ceramic injection as the leading edge core 5 and which is connected thereto by ceramic rods 50; - A second central core 12 connected by rods or a wall 312 to a ceramic plate 22, which is intended to form a thin cooling cavity along the upper surface of the blade; - A third central core 13 connected by rods or a wall 313 to a ceramic plate 23, which is intended to form a thin cooling cavity along the intrados wall of the blade; a fourth central core 14 which is made in the same ceramic injection as a trailing edge core 6 and which is connected thereto by rods 60.
    [0009] Preferably, the cores 11 and 14 are made in the same injection, at the same time as the trailing edge and leading edge cores 5 and 6. The central cores 11, 12, 13, 14 make it possible to create in the same direction dawn of the central cavities which, during operation of the turbomachine, convey air for cooling the leading edge, the extrados, the intrados and the trailing edge of the dawn which comes from a cooling circuit opening at the foot of the blade. The rods or wall 50, 60, 312, 313 make it possible for them to create channels through which this air passes to go into the leading edge cavities, extrados, intrados and trailing edge corresponding to the cores 5, 22, 23 and 6. Furthermore, with reference to the representation of FIG. 4, the assembly 3 also comprises a bath core 7 in the upper portion of the blade, as well as a foot core 8 in the lower part of dawn. Both of these cores 7, 8 extend in the length of the blade from the leading edge portion to the trailing edge portion. Each of the four central cores 11, 12, 13, and 14 is connected on one side to the bath core 7, and on the other to the foot core 8.
    [0010] The central cores 11, 12, 13 and 14 are connected to the bath core 7 by rods 70. Advantageously, for better rigidity, the leading edge core 5 is also connected to the bath core 7 by a rod 70. The rods 70 are quartz, silica, or preferably alumina rods. Preferably, the cores 7, 8, 5, 11, 6 and 14 are made in the same injection. The rods 70 connecting the cores 11, 14 and 5 are then predisposed in the injection mold. Thus in this way, the assembly and maintenance of different nuclei relative to each other is done in areas that disappear after manufacture of the dawn, or non-functional areas of the dawn, thus not affecting the properties of the dawn once molded and on which the appearance of a defect of the type "flash-metal", is not problematic. Furthermore, specific junction shapes can be provided which are embedded in the core of the bath 7 or in the core of the foot 8 and which provide the junction with one of the cores 11, 12, 13 or 14 (core 13 in Figure 4). In order to be able to carry out the other stages of manufacture of the blade, the final core 3 must be able to be handled without risk of deformation of the assembly, without the risk of defects appearing during the foundry step which follows the step of manufacture of the cores.
    [0011] This structure, by using the central cores 11, 12, 13 and 14 as stiffeners for the peripheral cores 22, 23 and for the leading edge and trailing edge cores 5 and 6, makes it possible to hold the constituent cores in position. the final core 3, and more particularly the peripheral cores 22 and 23 which are cores which are thin and therefore very fragile, thus allowing on the one hand handling with a lower risk of breakage and on the other hand a more precise metal injection. In addition, with such a solution, it is not necessary, to overtake the cores 11, 12, 13, 14, 22 and 23 of the tub area to be able to maintain in sufficient position, which allows to manufacture the bathtub by foundry at the same time as the body of the dawn, thus avoiding the use of a bathtub reported that requires heavy technology and risky. Once the assembly step is finished, a lost wax mold 10 is made around the ceramic assembly 3, the mold having the final shape of the blade. The lost wax mold is such that the wax parts are the parts that are called to be the metal parts of the dawn. A carapace is then made around the wax mold, and the wax is melted by steaming. A mold is thus obtained which is the perfect negative of the dawn as desired. The metal is then cast inside the mold. The carapace is removed, and the final nucleus is chemically dissolved, thus freeing the dawn and its cavities. The invention applies to a turbomachine turbine without this being the sole application. 20
    权利要求:
    Claims (14)
    [0001]
    REVENDICATIONS1. Process for producing an assembly (3) of ceramic cores (10, 11, 12, 13, 14, 20, 22, 23, 5, 6) for the manufacture by molding of a turbomachine blade, according to which realizes several subsets (1,
    [0002]
    2) cores (10, 12, 13, 20, 22, 23) and assemble these different subsets (1, 2) between them, as well as with a core which is a core (7, 8) bathtub or foot, characterized in that a sub-assembly (1, 2) of cores (10, 12, 13, 20, 22, 23) is formed by molding in a single injection operation at least two cores (10 , 12, 13, 20, 22, 23), the two cores (10, 12, 13, 20, 22, 23) of the subset (1, 2) obtained at the end of this operation being interconnected by a ceramic junction, and in that different sub-assemblies (1, 2) made in this way are then assembled to the bath (7,8) or foot core. 2. A method of producing an assembly (3) of ceramic cores according to claim 1, characterized in that during the production of a subset (1) of cores (10, 12, 20, 22), ceramic rods (31, 312) are arranged between the parts of the mold corresponding to the two cores (10, 12, 20, 22), prior to the injection of ceramic paste.
    [0003]
    3. Process for producing an assembly (3) of ceramic cores (10, 13, 20, 23) according to one of claims 1 and 2, characterized in that the junction between the two cores (10, 13, 20, 23) of at least one subassembly (2) of cores (10, 13, 20, 23) is formed by a ceramic connecting wall (32, 313) molded with the two cores (10, 13). , 20, 23).
    [0004]
    4. Process for producing an assembly (3) of ceramic cores (10, 12, 13, 20, 22, 23) according to claim 1, characterized in that a subset (1, 2) of cores ( 10, 12, 13, 20, 22, 23) comprises on the one hand a main core (10, 12, 13) intended to correspond to a main cavity for the circulation of cooling air of the blade and other A peripheral core (20, 22, 23) is provided to match a thin cavity along the edges of the blade.
    [0005]
    5. Manufacturing process according to one of claims 1 to 3, characterized in that at least one peripheral core (20, 22, 23) constitutes a lower surface core (23) or an extrados core (22). .
    [0006]
    6. Manufacturing process according to claim 5, characterized in that assembles at least one core (7, 8) bath or foot at least the following subsets: - a first subassembly which comprises a first central core (11) connected to a leading edge core (5); - a second subassembly (1, 2) which has a second central core (12) connected to an extrados core (22); a third subset (1, 2) which has a third central core (13) connected to a lower surface core (23), and - a fourth subassembly which has a fourth central core (14) connected to an edge leakage (6). 20
    [0007]
    7. Manufacturing process according to claim 6, characterized in that the assembly of the different subsets with a core (7,8) of tub (7) or foot (8) is made in non-functional areas of the body. 'dawn. 25
    [0008]
    8. Manufacturing process according to any one of the preceding claims, characterized in that the leading edge core (5) is connected to the single bath core (7). 30
    [0009]
    9. Manufacturing method according to any one of the preceding claims, characterized in that the junction of the four central cores (11, 12, 13, 14) with the bath core (7), and the junction of the edge core of etching (5) with the bath core (7), is carried out with rods (70) of quartz, or of silica, or preferably of alumina.
    [0010]
    10. Manufacturing process according to any one of the preceding claims, characterized in that at least one peripheral core (20, 22, 23) forms a plate having a thickness of between 0.3 mm and 1.5 mm.
    [0011]
    11. Assembly (3) ceramic cores 10, 11, 12, 13, 14, 20, 22, 23, 5, 6) for the manufacture of a turbomachine blade, characterized in that it is made by placing implementation of a method according to one of claims 1 to 10.
    [0012]
    12. Impeller of a turbomachine manufactured by lost-wax molding with a ceramic assembly (3) according to claim 11.
    [0013]
    13. blade of a turbomachine turbine according to claim 12.
    [0014]
    14. Turbine comprising at least one blade according to claim 13.
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3022811B1|2016-10-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    WO2003042503A1|2001-11-14|2003-05-22|Honeywell International Inc.|Internal cooled gas turbine vane or blade|US20170183969A1|2014-05-28|2017-06-29|Safran Aircraft Engines|Turbine blade with optimised cooling|
    CN108097888A|2016-11-25|2018-06-01|中国科学院金属研究所|A kind of preparation method of high temperature alloy tubulose sample|
    FR3065661A1|2017-04-28|2018-11-02|Safran Aircraft Engines|CORE FOR THE MANUFACTURE BY LOST WAX MOLDING OF A TURBOMACHINE WATER|
    WO2020245538A1|2019-06-06|2020-12-10|Safran|Improved foundry mould for the formation of turbine blade ceramic cores|
    法律状态:
    2015-06-12| PLFP| Fee payment|Year of fee payment: 2 |
    2016-01-01| PLSC| Search report ready|Effective date: 20160101 |
    2016-06-10| PLFP| Fee payment|Year of fee payment: 3 |
    2017-04-27| PLFP| Fee payment|Year of fee payment: 4 |
    2017-11-10| CD| Change of name or company name|Owner name: SNECMA, FR Effective date: 20170713 |
    2018-06-05| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-20| PLFP| Fee payment|Year of fee payment: 7 |
    2021-05-19| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1456175A|FR3022811B1|2014-06-30|2014-06-30|METHOD FOR MANUFACTURING CORE ASSEMBLY FOR MANUFACTURING A DAWN|FR1456175A| FR3022811B1|2014-06-30|2014-06-30|METHOD FOR MANUFACTURING CORE ASSEMBLY FOR MANUFACTURING A DAWN|
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