Ceramic matrix composite retaining ring and forming die and forming method thereof

Abstract

The invention relates to a ceramic matrix composite retaining ring and a forming mold and a forming method thereof. The forming mold comprises an inner mold and an outer mold which are combined and assembled to form an inner space; and the inner space is matched with the geometric shape of the ceramic matrix composite retaining ring and is used for shaping the geometric shape of the ceramic matrix composite retaining ring in the forming process of the retaining ring. The inner mold and the outer mold are matched through inclined planes and are positioned through alignment of the upper surface and the lower surface, the thickness of the retaining ring is accurately controlled, and the mold closing and demolding efficiency can also be improved through the mode that the multiple mold blocks are combined; the integral forming of the retaining ring is completed through die combination, the integral forming of the special-shaped retaining ring structure is realized, the forming difficulty is reduced, the sizing pressure can be uniformly applied to each part of the ceramic matrix composite retaining ring along the surface, the internal fiber volume fraction, the die attaching uniformity and the bonding strength among the parts of the ceramic matrix composite retaining ring are improved, and the production efficiency is improved. And further, the mechanical property of the formed ceramic matrix composite retaining ring is improved.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature component manufacturing technology for gas turbines, and particularly relates to a ceramic matrix composite retaining ring and its molding die and molding method. Background Technology

[0002] Gas turbine components operate in high-temperature environments, typically exceeding 1000℃. The retaining ring, located radially outside the turbine blades and forming part of the gas flow path, is subjected to erosion and scouring by the high-temperature combustion gases during turbine operation. Therefore, the temperature resistance of the retaining ring material is a key factor affecting its performance and lifespan. Ceramic matrix composites possess characteristics such as high temperature resistance, oxidation resistance, and high fracture toughness. Replacing metal materials with ceramic matrix composites in the retaining ring structure can improve the retaining ring's temperature resistance, reduce cooling gas consumption, and thus improve gas turbine efficiency and economic benefits.

[0003] When manufacturing parts using ceramic matrix composites, to ensure the surface dimensional accuracy of the parts, shaping molds must be designed on all outer surfaces of the parts, and retaining rings are placed between the inner molds for clamping and shaping. Ceramic matrix composites are continuous fiber-reinforced composites. During molding, it is required to press the parts as perpendicularly as possible to the part surface to increase the fiber volume fraction and improve the mechanical properties of the parts. If the tangential component of the pressing force is too large, it may cause internal fiber delamination and misalignment, affecting the mechanical properties of the parts. Furthermore, the adhesion between the part and the mold is relatively strong after molding and curing. Therefore, during demolding, the demolding direction should be as perpendicular as possible to the surface. If the demolding force along the tangential direction is too large, it may cause demolding difficulties. Due to the difficult-to-process characteristics of ceramic matrix composites, the retaining ring structure designed using them is generally "π" shaped and has a certain curvature around the gas turbine axis. Multiple retaining rings are combined to form a complete circular retaining ring assembly.

[0004] In the existing technology, there is no molding die or molding scheme for preparing gas turbine retaining rings using ceramic matrix composites. The closest solution is the ceramic matrix composite turbine outer ring in aero-turbine engines. Chinese patent CN114483207 discloses a ceramic matrix composite turbine outer ring preform, a shaping die, and its usage method. The outer ring preform is convex in shape and has a relatively simple structure. The shaping die only fixes the preform and cannot compress the surface of the preform, making it difficult to increase the internal fiber volume fraction of the preform and affecting the improvement of mechanical properties. Moreover, the parts prepared by this solution are relatively small in size, and it may be difficult to form a compact internal fiber preform structure for large-thickness retaining rings, affecting the final molding quality and mechanical properties of the retaining ring. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a ceramic matrix composite retaining ring, its molding die, and its molding method.

[0006] The technical solution adopted in this invention is:

[0007] In a first aspect, a ceramic matrix composite retaining ring is provided, comprising:

[0008] Front vertical plate, rear vertical plate, and bottom plate made of ceramic matrix composite material;

[0009] The meridional section formed by the front vertical plate, the rear vertical plate and the bottom plate is π-shaped and has a pre-set arc around the axis of the protective ring;

[0010] The surface normals of the front and rear vertical plates are parallel to the axis of the retaining ring.

[0011] The base plate rotates around the axis of the protective ring, forming an arc-shaped plate.

[0012] Secondly, a molding die for a ceramic matrix composite retaining ring is provided, comprising:

[0013] Inner mold and outer mold;

[0014] The inner and outer molds are assembled to form the internal space;

[0015] The internal space is adapted to the geometry of the ceramic matrix composite retaining ring of the first aspect, and is used to shape the geometry of the ceramic matrix composite retaining ring during the retaining ring molding process.

[0016] Furthermore, the inner mold includes:

[0017] The left mold, right mold, middle mold, and cover plate mold, after assembly, form a complete cavity for the ceramic matrix composite retaining ring.

[0018] The outer mold is used to install and position the inner mold. After the inner mold is installed in the outer mold, the cavity size of the inner mold is adapted to the outer surface of the ceramic matrix composite retaining ring.

[0019] Furthermore, the outer mold is a rectangular frame, used to press and fix the inner mold;

[0020] The inner side of the outer mold has a first inner inclined surface and a second inner inclined surface;

[0021] The first inner inclined surface of the outer mold cooperates with the assembly inclined surface of the left mold, and the second inner inclined surface of the outer mold cooperates with the assembly inclined surface of the right mold. This is used to convert the external vertical pressure into a clamping force perpendicular to each surface of the ceramic matrix composite retaining ring during the ring forming stage.

[0022] Furthermore, the left mold is elongated and block-shaped, and its meridional section is quadrilateral;

[0023] The left mold has a first left mold surface, a second left mold surface, and a left mold assembly slope on the other side of the first left mold surface;

[0024] The first surface of the left mold is adapted to the surface of the front vertical plate of the ceramic matrix composite retaining ring;

[0025] The second surface of the left mold is adapted to the surface of the base plate of the ceramic matrix composite retaining ring;

[0026] The left mold assembly inclined surface is adapted to the first inner inclined surface of the outer mold, and is used to convert the pressure load of the outer mold into a clamping force, which is then applied vertically to the surface of the front vertical plate.

[0027] Furthermore, the right mold is elongated and block-shaped, and its meridional section is quadrilateral;

[0028] The right mold has a first right mold surface, a second right mold surface, and a right mold assembly slope on the other side of the first right mold surface;

[0029] The first surface of the right mold is adapted to the surface of the rear vertical plate of the ceramic matrix composite retaining ring;

[0030] The second surface of the right mold is adapted to the surface of the base plate of the ceramic matrix composite retaining ring;

[0031] The right mold assembly inclined surface is adapted to the second inner inclined surface of the outer mold, which is used to convert the pressure load of the outer mold into a clamping force and apply it vertically to the surface of the rear vertical plate.

[0032] Furthermore, the middle mold includes a left side block, a right side block, and a middle block;

[0033] After the left, right, and middle blocks are assembled, the whole block is long and narrow, and the meridional section is quadrilateral.

[0034] The intermediate mold has a first surface, a second surface, and a third surface;

[0035] The first surface of the middle mold is adapted to the surface of the front vertical plate of the ceramic matrix composite retaining ring;

[0036] The second surface of the middle mold is adapted to the surface of the rear vertical plate of the ceramic matrix composite retaining ring;

[0037] The third surface of the middle mold is adapted to the surface of the base plate of the ceramic matrix composite retaining ring.

[0038] Furthermore, the left block is elongated and has a quadrilateral cross section. The first face of the left block is part of the first surface of the middle mold, the second face of the left block is part of the third surface of the middle mold, and the third and fourth faces of the left block are installed and fitted with the middle block. The included angle between the third and fourth faces of the left block is an obtuse angle.

[0039] The right block is long and narrow, and its meridional section is quadrilateral. The first face of the right block is part of the second face of the middle mold, the second face of the right block is part of the third face of the middle mold, and the third and fourth faces of the right block are installed and fitted with the middle block. The included angle between the third and fourth faces of the right block is an obtuse angle.

[0040] The middle block is long and narrow, and its meridional section is mountain-shaped. The top surface of the middle block is part of the third surface of the middle mold. There are installation positions on both sides of the top surface for installing the left and right blocks, respectively.

[0041] Bolt holes are provided at the bottom of the installation position for screwing in bolts to demold the intermediate block after the ceramic matrix composite retaining ring is formed.

[0042] Furthermore, the cover plate mold is plate-shaped, having a top plane and a lower arc surface;

[0043] The lower arc surface of the cover plate is adapted to the surface of the base plate of the ceramic matrix composite retaining ring;

[0044] The upper surface of the cover plate is flush with the upper surface of the outer mold after assembly, and is used to position the thickness of the base plate of the ceramic matrix composite retaining ring.

[0045] Thirdly, a method for molding a ceramic matrix composite retaining ring is provided, using a molding die applied to the ceramic matrix composite retaining ring of the second aspect. The molding method includes:

[0046] S1, place the left mold on the operating platform with the second mold surface of the left mold facing upwards, and use fiber cloth to lay up and form area one on the first mold surface and the second mold surface of the left mold.

[0047] S2, place the right mold on the operating platform with the right mold second surface facing upwards, and use fiber cloth to lay up and form area three on the right mold first surface and right mold second surface of the right mold;

[0048] S3, Assemble the left block, middle block and right block to form the middle mold, and place the middle mold on the operating platform with the third mold surface facing upwards. Use fiber cloth to lay up the first mold surface, second mold surface and third mold surface of the middle mold to form area two.

[0049] S4, combine and place the left mold, middle mold and right mold, and place the middle mold in the middle position. The first surface of the middle mold is opposite to the left mold, and the second surface of the middle mold is opposite to the right mold. Use fiber cloth and fiber bundles to lay up and form area six between the middle mold and the right mold.

[0050] S5, place the outer mold on the outside of the left mold, right mold and middle mold, so that the first inner inclined surface of the outer mold contacts the left mold assembly inclined surface of the left mold, and the second inner inclined surface of the outer mold contacts the right mold assembly inclined surface of the right mold, and press the outer mold down until the lower surface of the outer mold is flush with the lower surface of the inner mold.

[0051] S6, use fiber cloth and fiber bundles to lay up to form zone five between zone one and zone two;

[0052] S7, use fiber cloth to lay up and form area four in the area laid in S1-S6, and place the cover plate mold on area four, apply pressure on the cover plate surface of the cover plate mold until it is flush with the upper surface of the outer mold.

[0053] The beneficial effects achieved by this invention are as follows:

[0054] The molding die for ceramic matrix composite retaining rings mainly consists of an outer mold and an inner mold. The inner mold and the outer mold are fitted with inclined surfaces and positioned by aligning the upper and lower surfaces, which can precisely control the thickness of the retaining ring. At the same time, the combination of multiple mold pieces can also improve the efficiency of mold closing and demolding.

[0055] The molding method of ceramic matrix composite retaining rings divides the ceramic matrix composite retaining ring into multiple regions, lays them in different molds, and finally completes the overall molding of the ceramic matrix composite retaining ring by mold assembly. This achieves integrated molding of irregularly shaped retaining ring structures, reduces molding difficulty, and can uniformly apply shaping pressure to each part of the ceramic matrix composite retaining ring along the surface. This improves the internal fiber volume fraction, mold uniformity, and bonding strength between different parts of the ceramic matrix composite retaining ring, thereby improving the mechanical properties of the molded ceramic matrix composite retaining ring. Attached Figure Description

[0056] Figure 1 This is an overall structural diagram of the molding die for the ceramic matrix composite retaining ring of the present invention;

[0057] Figure 2 This is a cross-sectional view of the internal structure of the molding die for the ceramic matrix composite retaining ring of the present invention;

[0058] Figure 3 This is a cross-sectional structural diagram of the molding die for the ceramic matrix composite retaining ring of the present invention;

[0059] Figure 4 This is a structural diagram of the ceramic matrix composite retaining ring of the present invention;

[0060] Figure 5 This is a structural diagram of the outer mold of the present invention;

[0061] Figure 6 This is a cross-sectional front view of the outer mold of the present invention;

[0062] Figure 7 This is a schematic diagram of the left mold of the present invention;

[0063] Figure 8 This is a schematic diagram of the right mold of the present invention;

[0064] Figure 9 This is a schematic diagram of the mold used in this invention;

[0065] Figure 10 This is a flowchart of the molding method for the ceramic matrix composite retaining ring of the present invention;

[0066] Figure 11 This is a schematic diagram of the regional layup structure of the ceramic matrix composite retaining ring of the present invention.

[0067] The attached figures are labeled as follows:

[0068] 1. Left mold, 11. First surface of left mold, 12. Second surface of left mold, 13. Assembly slope of left mold, 2. Middle mold, 21. Left side block, 22. Right side block, 23. Middle block, 24. First surface of middle mold, 25. Second surface of middle mold, 26. Third surface of middle mold, 3. Right mold, 31. First surface of right mold, 32. Second surface of right mold, 33. Assembly slope of right mold, 4. Cover plate mold, 5. Outer mold, 51. First inner slope of outer mold, 52. Second inner slope of outer mold, 6. Ceramic matrix composite protective ring, 61. Front vertical plate, 62. Rear vertical plate, 63. Base plate, 64. Area 1, 65. Area 2, 66. Area 3, 67. Area 4, 68. Area 5 and 69. Area 6. Detailed Implementation

[0069] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0070] like Figures 1-3 As shown, an embodiment of the present invention provides a molding die for a ceramic matrix composite retaining ring, comprising:

[0071] 5. Inner mold and outer mold;

[0072] The inner mold and outer mold are assembled in five combinations to form the internal space;

[0073] The internal space is adapted to the geometry of the ceramic matrix composite retaining ring 6, and is used to shape the geometry of the ceramic matrix composite retaining ring 6 during the retaining ring molding process.

[0074] Combination Figure 2 and Figure 3 The structural diagram of the molding die shown is provided. Preferably, the structure of the ceramic matrix composite retaining ring 6 in this embodiment of the invention is as follows: Figure 4As shown, it includes:

[0075] The front vertical plate 61, the rear vertical plate 62, and the bottom plate 63 are made of ceramic matrix composite material;

[0076] The meridional section formed by the front vertical plate 61, the rear vertical plate 62 and the bottom plate 63 is π-shaped and has a pre-set arc around the axis of the protective ring;

[0077] The surface normals of the front vertical plate 61 and the rear vertical plate 62 are parallel to the axis of the guard ring.

[0078] The base plate 63 rotates around the axis of the protective ring, forming an arc-shaped plate.

[0079] Preferably, combining the above Figures 1-4 In the embodiment shown, the inner mold includes:

[0080] The left mold 1, right mold 3, middle mold 2 and cover plate mold 4, after assembly, form a complete cavity for the ceramic matrix composite retaining ring 6;

[0081] The outer mold 5 is used to install and position the inner mold. After the inner mold is installed in the outer mold 5, the cavity size of the inner mold is adapted to the outer surface of the ceramic matrix composite retaining ring 6.

[0082] The inner mold, outer mold 5, and cover plate mold 4 are all made of high-temperature resistant materials, such as high-temperature alloys, high-purity graphite, and isostatic graphite.

[0083] Preferred, such as Figure 5 and Figure 6 As shown, the outer mold 5 is a rectangular frame used to press and fix the inner mold;

[0084] The inner side of the outer mold 5 has a first inner inclined surface 51 and a second inner inclined surface 52.

[0085] The first inner inclined surface of the outer mold mates with the assembly inclined surface of the left mold, and the second inner inclined surface of the outer mold mates with the assembly inclined surface of the right mold. This is used to convert the external vertical pressure into a clamping force perpendicular to each surface of the ceramic matrix composite retaining ring during the retaining ring molding stage. This increases the internal fiber volume fraction of the ceramic matrix composite retaining ring.

[0086] Preferred, such as Figure 7 As shown, the left mold 1 in the inner mold is a long strip block, and its meridional section is quadrilateral;

[0087] The left mold 1 has a left mold first surface 11, a left mold second surface 12, and a left mold assembly inclined surface 13 on the other side of the left mold first surface 11;

[0088] The first surface 11 of the left mold is adapted to the surface of the front vertical plate 61 of the ceramic matrix composite retaining ring 6;

[0089] The second surface 12 of the left mold is adapted to the surface of the base plate 63 of the ceramic matrix composite retaining ring 6;

[0090] The left mold assembly inclined surface 13 is adapted to the first inner inclined surface 51 of the outer mold 5, and is used to convert the pressure load of the outer mold 5 into a clamping force and apply it vertically to the surface of the front vertical plate 61.

[0091] Preferred, such as Figure 8 As shown, the right mold 3 is in the shape of a long strip, and its meridional section is quadrilateral;

[0092] The right mold 3 has a right mold first surface 31, a right mold second surface 32, and a right mold assembly inclined surface 33 on the other side of the right mold first surface 31;

[0093] The first surface 31 of the right mold is adapted to the surface of the rear vertical plate 62 of the ceramic matrix composite retaining ring 6;

[0094] The second surface 32 of the right mold is adapted to the surface of the base plate 63 of the ceramic matrix composite retaining ring 6;

[0095] The right mold assembly inclined surface 33 is adapted to the second inner inclined surface 52 of the outer mold 5, and is used to convert the pressure load of the outer mold 5 into a clamping force and apply it vertically to the surface of the rear vertical plate 62.

[0096] Preferred, such as Figure 9 As shown, the middle mold 2 includes a left block 21, a right block 22 and a middle block 23;

[0097] After the left block 21, right block 22 and middle block 23 are assembled, the whole block is long and narrow, and the meridional section is quadrilateral.

[0098] The middle mold 2 has a first surface 24, a second surface 25, and a third surface 26.

[0099] The first surface 24 of the middle mold is adapted to the surface of the front vertical plate 61 of the ceramic matrix composite retaining ring 6;

[0100] The second surface 25 of the middle mold is adapted to the surface of the rear vertical plate 62 of the ceramic matrix composite retaining ring 6;

[0101] The third surface 26 of the middle mold is adapted to the surface of the base plate 63 of the ceramic matrix composite retaining ring 6.

[0102] Preferably, the left block 21 is elongated and has a quadrilateral cross-section. The first face of the left block 21 is part of the first surface 24 of the middle mold, the second face of the left block 21 is part of the third surface 26 of the middle mold, and the third and fourth faces of the left block 21 are fitted with the middle block. The included angle between the third and fourth faces of the left block 21 is an obtuse angle. The angle range is 90° to 120°, which facilitates the demolding of the middle block after molding.

[0103] The right block 22 is elongated and has a quadrilateral cross-section. The first face of the right block 22 is part of the second surface 25 of the middle mold, and the second face of the right block 22 is part of the third surface 26 of the middle mold. The third and fourth faces of the right block 22 are fitted with the middle block, and the included angle between the third and fourth faces of the right block 22 is an obtuse angle. The angle range is 90° to 120°, which facilitates the demolding of the middle block after molding.

[0104] The middle block 23 is long and narrow, and its meridional section is mountain-shaped. The top surface of the middle block 23 is part of the third surface 26 of the middle mold. There are installation positions on both sides of the top surface for installing the left block 21 and the right block 22, respectively.

[0105] Bolt holes are provided at the bottom of the installation position for screwing in bolts to demold the intermediate block 23 after the ceramic matrix composite retaining ring is formed.

[0106] Preferably, the cover plate mold 4 is plate-shaped, having a top plane and a lower arc surface;

[0107] The lower arc surface of the cover plate is adapted to the surface of the base plate 63 of the ceramic matrix composite retaining ring 6;

[0108] The upper surface of the cover plate is flush with the upper surface of the outer mold 5 after assembly, and is used to position the thickness of the base plate of the ceramic matrix composite retaining ring.

[0109] Based on the molding die for the ceramic matrix composite retaining ring described in the above embodiments, the molding method for the ceramic matrix composite retaining ring will be explained below through embodiments.

[0110] like Figure 10 As shown, an embodiment of the present invention provides a method for molding a ceramic matrix composite retaining ring, comprising:

[0111] S1, place the left mold on the operating platform with the second mold surface of the left mold facing upwards, and use fiber cloth to lay up and form area one on the first mold surface and the second mold surface of the left mold.

[0112] Specific regional layup structures of ceramic matrix composite retaining rings, such as Figure 11 As shown.

[0113] S2, place the right mold on the operating platform with the right mold second surface facing upwards, and use fiber cloth to lay up and form area three on the right mold first surface and right mold second surface of the right mold;

[0114] S3, Assemble the left block, middle block and right block to form the middle mold, and place the middle mold on the operating platform with the third mold surface facing upwards. Use fiber cloth to lay up the first mold surface, second mold surface and third mold surface of the middle mold to form area two.

[0115] S4, combine and place the left mold, middle mold and right mold, and place the middle mold in the middle position. The first surface of the middle mold is opposite to the left mold, and the second surface of the middle mold is opposite to the right mold. Use fiber cloth and fiber bundles to lay up and form area six between the middle mold and the right mold.

[0116] S5, place the outer mold on the outside of the left mold, right mold and middle mold, so that the first inner inclined surface of the outer mold contacts the left mold assembly inclined surface of the left mold, and the second inner inclined surface of the outer mold contacts the right mold assembly inclined surface of the right mold, and press the outer mold down until the lower surface of the outer mold is flush with the lower surface of the inner mold.

[0117] S6, use fiber cloth and fiber bundles to lay up to form zone five between zone one and zone two;

[0118] S7, use fiber cloth to lay up and form area four in the area laid in S1-S6, and place the cover plate mold on area four, apply pressure on the cover plate surface of the cover plate mold until it is flush with the upper surface of the outer mold.

[0119] In summary, the beneficial effects achieved by the present invention, as described in the above embodiments regarding the ceramic matrix composite retaining ring, its molding die, and molding method, are as follows:

[0120] The molding die for ceramic matrix composite retaining rings mainly consists of an outer mold and an inner mold. The inner mold and the outer mold are fitted with inclined surfaces and positioned by aligning the upper and lower surfaces, which can precisely control the thickness of the retaining ring. At the same time, the combination of multiple mold pieces can also improve the efficiency of mold closing and demolding.

[0121] The molding method of ceramic matrix composite retaining rings divides the ceramic matrix composite retaining ring into multiple regions, lays them in different molds, and finally completes the overall molding of the ceramic matrix composite retaining ring by mold assembly. This achieves integrated molding of irregularly shaped retaining ring structures, reduces molding difficulty, and can uniformly apply shaping pressure to each part of the ceramic matrix composite retaining ring along the surface. This improves the internal fiber volume fraction, mold uniformity, and bonding strength between different parts of the ceramic matrix composite retaining ring, thereby improving the mechanical properties of the molded ceramic matrix composite retaining ring.

[0122] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0123] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0124] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0125] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0126] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A ceramic matrix composite retention ring, characterized by, The application relates to a ceramic matrix composite ring, and relates to a ceramic matrix composite ring and a forming device thereof. The front vertical plate, the rear vertical plate and the bottom plate of the ceramic matrix composite ring are combined to form a meridian section in the shape of a Pi and a preset arc around the ring axis. The surface normal of the front vertical plate and the rear vertical plate is parallel to the ring axis. The bottom plate is in the shape of a circular arc around the ring axis. The application relates to a ceramic matrix composite ring and a forming device thereof.

2. A forming die for a ceramic matrix composite ring, characterized by, The inner mold and the outer mold are combined to form an internal space. The internal space is adapted to the geometric shape of the ceramic matrix composite ring and is used for shaping the geometric shape of the ceramic matrix composite ring during ring forming. The inner mold comprises a left mold, a right mold, a middle mold and a cover plate mold. The outer mold is used for installing and positioning the inner mold.

3. The forming die for a ceramic matrix composite retention ring of claim 2, wherein, The outer mold is a rectangular frame used for pressing and fixing the inner mold. The inner side of the outer mold is provided with an outer mold first inner inclined surface and an outer mold second inner inclined surface. The outer mold first inner inclined surface is matched with the assembly inclined surface of the left mold, and the outer mold second inner inclined surface is matched with the assembly inclined surface of the right mold.

4. The forming die for a ceramic matrix composite retention ring of claim 3, wherein, The left mold is in the shape of a long strip block and has a meridian section in the shape of a quadrilateral. The left mold is provided with a left mold first profile, a left mold second profile and a left mold assembly inclined surface on the other side of the left mold first profile. The left mold first profile is matched with the surface of the front vertical plate of the ceramic matrix composite ring.

5. The forming die for a ceramic matrix composite retention ring of claim 4, wherein, The left mold second profile is matched with the surface of the bottom plate of the ceramic matrix composite ring. The left mold assembly inclined surface is matched with the outer mold first inner inclined surface of the outer mold and is used for converting the pressure load of the outer mold into pressing force and vertically applying the pressing force on the surface of the front vertical plate. The right mold is in the shape of a long strip block and has a meridian section in the shape of a quadrilateral. The right mold is provided with a right mold first profile, a right mold second profile and a right mold assembly inclined surface on the other side of the right mold first profile. The right mold first profile is matched with the surface of the rear vertical plate of the ceramic matrix composite ring.

6. The ceramic matrix composite turbine shroud forming mold of claim 4, wherein, The right mold second profile is matched with the surface of the bottom plate of the ceramic matrix composite ring. The right mold assembly inclined surface is matched with the outer mold second inner inclined surface of the outer mold and is used for converting the pressure load of the outer mold into pressing force and vertically applying the pressing force on the surface of the rear vertical plate. The middle mold comprises a left block, a right block and a middle block. The left block, the right block and the middle block are combined to form a long strip block and have a meridian section in the shape of a quadrilateral. The middle mold is provided with a middle mold first profile, a middle mold second profile and a middle mold third profile.

7. The forming die for a ceramic matrix composite retention ring of claim 3, wherein, The middle mold first profile is matched with the surface of the front vertical plate of the ceramic matrix composite ring. The middle mold second profile is matched with the surface of the rear vertical plate of the ceramic matrix composite ring. ​ ​ ​ The third profile of the middle mold is matched with the surface of the bottom plate of the ceramic matrix composite guard ring.

8. The forming die for a ceramic matrix composite retention ring of claim 7, wherein, The left block is long strip-shaped and has a quadrangular meridian section, the first surface of the left block is a part of the first profile of the middle mold, the second surface of the left block is a part of the third profile of the middle mold, the third and fourth surfaces of the left block are mounted with the middle block, and the included angle between the third and fourth surfaces of the left block is obtuse. The right block is long strip-shaped and has a quadrangular meridian section, the first surface of the right block is a part of the second profile of the middle mold, the second surface of the right block is a part of the third profile of the middle mold, the third and fourth surfaces of the right block are mounted with the middle block, and the included angle between the third and fourth surfaces of the right block is obtuse. The middle block is long strip-shaped and has a mountain-shaped meridian section, the top surface of the middle block is a part of the third profile of the middle mold, and the two sides of the top surface are provided with mounting positions for mounting the left block and the right block. The bottom of the mounting position is provided with a bolt hole for screwing a bolt into the middle block for demolding after the ceramic matrix composite guard ring is formed.

9. The forming die for a ceramic matrix composite retention ring of claim 3, wherein, The cover plate mold is plate-shaped and has a cover plate top plane and a cover plate lower arc surface. The cover plate lower arc surface is matched with the surface of the bottom plate of the ceramic matrix composite guard ring. The cover plate upper plane is flush with the upper plane of the outer mold after assembly, and is used for positioning the thickness of the bottom plate of the ceramic matrix composite guard ring.

10. A method of forming a ceramic matrix composite retention ring, characterized by, The forming method applied to the ceramic matrix composite guard ring of any one of claims 2-9 comprises: S1, placing the left mold on the operation platform with the second profile of the left mold upward, and using fiber cloth to layer the forming area one on the first profile and the second profile of the left mold; S2, placing the right mold on the operation platform with the second profile of the right mold upward, and using fiber cloth to layer the forming area three on the first profile and the second profile of the right mold; S3, combining and mounting the left block, the middle block and the right block to form the middle mold, and placing the middle mold on the operation platform with the third profile of the middle mold upward, and using fiber cloth to layer the forming area two on the first profile, the second profile and the third profile of the middle mold; S4, combining and placing the left mold, the middle mold and the right mold, and placing the middle mold in the middle position, the first profile of the middle mold is opposite to the left mold, the second profile of the middle mold is opposite to the right mold, and using fiber cloth and fiber bundle to layer the forming area six between the middle mold and the right mold; S5, the outer mold is sleeved outside the left mold, the right mold and the middle mold, the outer mold first inner inclined surface is in contact with the left mold assembly inclined surface, the outer mold second inner inclined surface is in contact with the right mold assembly inclined surface, and the outer mold is pressed downward until the lower surface of the outer mold is flush with the lower surface of the inner mold; S6, using fiber cloth and fiber bundle to lay up and form area five between the area one and the area two; S7, using fiber cloth to lay up and form area four on the area laid up by S1-S6, and placing a cover plate mold on the area four, and applying pressure on the cover plate of the cover plate mold until the upper surface of the cover plate mold is flush with the upper surface of the outer mold.

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