Ceramic matrix composite single-unit fixed guide vane tooling and assembly method

Abstract

The present invention relates to a single-joint fixed guide blade tooling and an assembly method, and specifically to a ceramic-based composite material single-joint fixed guide blade tooling and an assembly method. The present invention solves the technical problem of the lack of special tooling for existing single-joint fixed guide blades. The single-joint fixed guide blade tooling of the present invention includes a base, an inner edge plate pressure plate, an outer edge plate pressure plate, a first blade body positioning pad, a second blade body positioning pad, an inner edge plate positioning base and an outer edge plate positioning base; the first blade body positioning pad and the second blade body positioning pad are spliced together to form a groove for fixing the blade body position and angular direction; the inner edge plate positioning base and the inner edge plate pressure plate are used in conjunction with the inner edge plate assembly to ensure that the assembly clearance between the inner edge plate assemblies and between the inner edge plate assembly and the blade body meets the standard; the outer edge plate positioning base and the outer edge plate pressure plate are used in conjunction with the outer edge plate assembly to ensure that the assembly clearance between the outer edge plate assemblies and between the outer edge plate assembly and the blade body meets the standard.

Description

Technical Field

[0001] The present invention relates to a single-joint fixed guide vane tooling for an aero-engine and an assembly method thereof, in particular to a single-joint fixed guide vane tooling for a ceramic-based composite material and an assembly method thereof. Background Art

[0002] The primary function of the fixed guide vanes is to deflect the high-temperature, high-speed airflow exiting the combustion chamber at a specific angle, directing it toward the turbine's high- and low-pressure blades. The high-speed rotation of these blades drives the compressor shaft in a continuous reciprocating cycle, generating continuous thrust. During operation, the fixed guide vanes must withstand temperatures of approximately 1300°C, extreme thermal stress, gas stress, thermal strain, and complex corrosion.

[0003] SiC f / SiC ceramic matrix composites, as a material with low density, high temperature resistance, corrosion resistance, high toughness and other characteristics, are considered to be the most ideal material for the hot end components of the sixth generation aircraft engine. In order to meet the working requirements of the fixed guide vanes, SiC f / SiC ceramic matrix composite materials are the preferred materials for fixed guide vanes. In addition, at present, the country is carrying out relevant research work on static scale and proportional parts, among which SiC f / SiC ceramic matrix composite single fixed guide vane is one of the key research objects at present. From aerodynamic design to assembly and production, the design and process need to go through repeated exploration and improvement. f The tooling and assembly methods of single-unit fixed guide vanes made of SiC ceramic matrix composite materials are closely related to the final quality of the blade products. In particular, the control accuracy of the fitting clearances between the various parts during the assembly of single-unit fixed guide vanes determines the ultimate conditions that the fixed guide vanes can withstand during service.

[0004] In the prior art, a popular SiC material used in aircraft engines is f / SiC ceramic matrix composite single fixed guide vane structure, such as Figure 1 and Figure 2As shown, it includes a blade body 01, an inner edge plate assembly 02 and an outer edge plate assembly 03; an upper tenon 011 and a lower tenon 012 are provided at one end of the blade body 01 close to the inner edge plate assembly 02, and a pin hole is provided on the upper tenon 011; an outer tenon 013 is provided at one end close to the outer edge plate assembly 03, and the blade body 1 includes a blade front curved surface 014 and a blade rear curved surface; the inner edge plate assembly 02 includes a first inner edge plate 021, a second inner edge plate 022 and a third inner edge plate 023, and a plurality of steps 0212 are sequentially provided on the bottom surface of the first inner edge plate 021 from the outside to the inside, and a first window grille 021 is provided on the first inner edge plate 021 1. The third inner edge plate 023 is provided with a second window grille 0231 and a third window grille 0232; the outer edge plate assembly 03 includes a first outer edge plate 031, a second outer edge plate 032 and a third inner edge plate 033; the upper and lower ends of the first outer edge plate 031 are respectively provided with an upper protruding structure 0311 and a lower protruding structure 0312 extending outward, and the lower end of the second outer edge plate 032 is provided with a bottom end protruding structure 0321; the first outer edge plate 031 and the third inner edge plate 033 are respectively provided with a fifth window grille 0313 and a fourth window grille 0331, and the outer tenon 013 passes through the window grille 0331 and the window grille 0313 in sequence. The specific structural features, positional relationship and connection relationship of the blade body 01 and the inner edge plate assembly 02 of the fixed guide blade structure have been disclosed in Chinese patent CN1112017, and the specific structural features, positional relationship and connection relationship of the blade body 01 and the outer edge plate assembly 03 of the fixed guide blade structure have been disclosed in Chinese patent CN110985134.

[0005] The above SiC f / SiC ceramic matrix composite single-unit fixed guide vane has a special and complex structure, small size and is difficult to assemble. Currently, there is no special tooling suitable for this fixed guide vane. Therefore, there is an urgent need to design a special tooling that can ensure product quality. Summary of the Invention

[0006] The purpose of the present invention is to solve the technical problem that the existing single-joint fixed guide blade has a special and complex structure, small size, and great difficulty in assembly, and there is currently no suitable special tooling. Instead, a ceramic-based composite material single-joint fixed guide blade tooling and assembly method are provided.

[0007] The inventive concept of the present invention is based on the following problems in assembly: 1. The fixed guide blade is small in size, with the length, width and height all within the range of 50mm, which greatly limits the positioning reference surface and operating space, making it impossible to accurately position the fixed guide blade; 2. The small-sized (about 1mm) geometric features on the various parts of the fixed guide blade cannot be processed in place, making it difficult to ensure the processing accuracy of the parts. f / The matrix material of SiC ceramic-based composite materials is SiC, which is a typical difficult-to-machine material. Existing diamond tools make it difficult to machine small-sized geometric features. 3. Due to the limitations of existing assembly processes, the assembly gap between the various parts of the fixed guide blade is ≥0.2mm, and the assembly accuracy is low, making it difficult to meet the requirements of the final product. A special ceramic-based composite single-unit fixed guide blade tooling was designed.

[0008] In order to achieve the above-mentioned purpose and complete the above-mentioned inventive concept, the technical solutions provided by the present invention are:

[0009] A ceramic matrix composite single-joint fixed guide vane fixture, which is special in that:

[0010] It includes a base, an inner edge plate pressure plate, an outer edge plate pressure plate, and a first blade body positioning pad, a second blade body positioning pad, an inner edge plate positioning base, and an outer edge plate positioning base fixedly arranged on the base;

[0011] The first blade positioning pad is provided with a first curved surface adapted to the rear curved surface of the blade;

[0012] The second blade positioning pad is provided with a second curved surface adapted to the lower end of the blade front curved surface;

[0013] The first blade positioning pad and the second blade positioning pad are fixedly connected, so that the first curved surface and the second curved surface are combined to form a groove for accommodating the blade, and the inner surface of the groove is in contact with the lower end of the blade rear curved surface and the blade front curved surface of the blade;

[0014] The upper end of the inner side wall of the inner edge plate positioning base is provided with a first protrusion extending inwardly, the angle of the upper end surface of the inner edge plate positioning base and the angle of the first protrusion are the same as the assembly angle of the inner edge plate assembly, and the curvature of the upper end surface of the inner edge plate positioning base and the outermost step surface of the bottom of the first inner edge plate are the same; the upper end surface of the inner edge plate positioning base is used to contact the outermost step surface of the bottom of the first inner edge plate, and the first protrusion is used to extend into the second inner edge plate;

[0015] A second protrusion extending upward is provided on the outer side of the upper end of the inner edge plate positioning base, and the height of the second protrusion is 0.5 to 1 mm less than the thickness of the bottom end of the first inner edge plate;

[0016] The bottom surface of the inner edge plate pressure plate and the upper surface of the bottom end of the first inner edge plate have the same curvature; the inner edge plate pressure plate is fixedly connected to the upper end surface of the inner edge plate positioning base, and the bottom surface of the inner edge plate pressure plate is in tight contact with the upper surface of the second protrusion;

[0017] The angle of the upper end surface of the outer edge plate positioning base is the same as the assembly angle of the outer edge plate assembly;

[0018] The lower end surface of the outer edge plate pressure plate is provided with a step structure, the lower step surface of the step structure contacts the upper end surface of the outer edge plate positioning base, and a slot is formed between the upper step surface and the upper end surface of the outer edge plate positioning base, and the shape of the slot is adapted to the shape of the upper protrusion structure and the bottom end protrusion structure;

[0019] The lower surface of the card slot is used to fit in contact with the lower surface of the upper protruding structure, and the upper surface is used to fit in contact with the upper surface of the bottom end protruding structure;

[0020] The upper end of the inner side wall of the outer edge plate positioning base is provided with a first avoidance groove for the outer tenon to avoid, and the lower end of the inner side wall of the outer edge plate positioning base is provided with a second avoidance groove for the lower protruding structure of the first outer edge plate to avoid;

[0021] The outer edge plate pressing plate is fixedly connected to the upper end surface of the outer edge plate positioning base.

[0022] Furthermore, the lower ends of the first blade positioning pad, the second blade positioning pad, the inner edge plate positioning base and the outer edge plate positioning base are all provided with an outer edge protrusion structure extending outward, and the first blade positioning pad, the second blade positioning pad, the inner edge plate positioning base and the outer edge plate positioning base are fixedly connected to the base through the outer edge protrusion structure.

[0023] Furthermore, the base is provided with a first mounting groove, a second mounting groove and a third mounting groove in sequence along the length direction;

[0024] The inner edge plate positioning base is arranged in the first installation groove; the first blade positioning pad and the second blade positioning pad are arranged in the second installation groove; and the outer edge plate positioning base is arranged in the third installation groove.

[0025] Furthermore, the first mounting slot, the second mounting slot and the third mounting slot are dovetail mounting slots or T-slots;

[0026] The bottom ends of the inner edge plate positioning base, the first blade positioning pad, the second blade positioning pad and the outer edge plate positioning base are provided with structures that cooperate with the dovetail mounting groove or the T-shaped groove, so that the inner edge plate positioning base, the first blade positioning pad, the second blade positioning pad and the outer edge plate positioning base form a sliding connection with the corresponding first mounting groove, the second mounting groove and the third mounting groove respectively.

[0027] Furthermore, the first mounting groove, the second mounting groove and the third mounting groove are all dovetail mounting grooves; the angle between the side surface and the bottom surface of the dovetail mounting groove is 85°.

[0028] Furthermore, a positioning pin hole is provided on the outer edge structure of the inner edge plate positioning base, and a positioning pin hole corresponding to the positioning pin hole of the inner edge plate positioning base is provided on the base, and the inner edge plate positioning base is positioned by inserting a pin into the positioning pin hole of the inner edge plate positioning base and the positioning pin hole on the base in sequence;

[0029] The first blade positioning pad and the second blade positioning pad are respectively provided with bolt holes at positions below the groove, and the first blade positioning pad and the second blade positioning pad are fastened by screwing bolts into the bolt holes of the first blade positioning pad and the second blade positioning pad.

[0030] Furthermore, the second avoidance groove on the outer edge plate positioning base is a U-shaped groove, the angle of the U-shaped groove is the same as the assembly angle of the lower protruding structure of the first outer edge plate, and the depth of the U-shaped groove is greater than the width of the lower protruding structure of the first outer edge plate.

[0031] Furthermore, the outer edge structures of the inner edge plate positioning base, the first blade positioning pad, the second blade positioning pad and the outer edge plate positioning base are respectively fixedly connected to the base by bolts; the outer edge plate pressure plate and the upper end surface of the outer edge plate positioning base are fixedly connected by bolts; the inner edge plate pressure plate and the upper end surface of the inner edge plate positioning base are fixedly connected by bolts; and a plurality of weight-reducing grooves are respectively provided on the first curved surface of the first blade positioning pad and the second curved surface of the second blade positioning pad.

[0032] A method for assembling a ceramic matrix composite single-joint fixed guide vane is based on the above-mentioned ceramic matrix composite single-joint fixed guide vane tooling, and its special feature is that it includes the following steps:

[0033] 1) Check the surfaces of the blade, inner edge plate assembly and outer edge plate assembly to ensure they are clean and smooth;

[0034] 2) Installation of blades

[0035] 2.1) Install the first blade positioning block in a fixed position, and use the first blade positioning block as a reference to install the second blade positioning block in a semi-fixed position;

[0036] 2.2) Install the blade. Adjust the second blade positioning block so that the gap between the blade and the first and second blade positioning blocks is 0.02-0.2 mm, and tighten the second blade positioning block.

[0037] 3) Installation of inner edge plate assembly

[0038] 3.1) Install the third inner edge plate. During installation, trim the second and third window grilles to ensure that the assembly clearance between the upper tenon and the third window grille, the lower tenon and the second window grille, and the surface fitting clearance between the blade and the third inner edge plate are all 0.02-0.2mm.

[0039] 3.2) Install the first and second inner edge panels. During installation, trim the first window grille to ensure that the assembly clearance between the first window grille and the upper tenon and the profile fitting clearance between the first and third inner edge panels are both 0.02-0.2 mm.

[0040] 3.3) Install the inner edge plate positioning base and the inner edge plate pressure plate in sequence. Adjust the inner edge plate positioning base to ensure that the gap between the inner edge plate positioning base and the first inner edge plate is 0.02-0.2mm.

[0041] 4) Installation of outer edge plate assembly

[0042] 4.1) Install the third outer edge plate and trim the fourth window grille during installation to ensure that the assembly clearance between the outer tenon and the fourth window grille and the surface fitting clearance between the blade and the third outer edge plate are 0.02-0.2mm;

[0043] 4.2) Install the first and second outer edge panels. During installation, trim the fifth window grille to ensure that the gap between the outer tenon and the fifth window grille and the gap between the first and third outer edge panels are 0.02-0.2 mm.

[0044] 4.3) Install the outer edge plate positioning base and the outer edge plate pressure plate in sequence. Adjust the outer edge plate positioning base to ensure that the surface fitting clearance between the outer edge plate positioning base and the first outer edge plate, and between the outer edge plate pressure plate and the second outer edge plate, is 0.02-0.2 mm.

[0045] 5) Remove the fixed guide blades of 4.3) as a whole and perform SiC deposition. After the deposition is completed, polish and trim them. Then assemble the fixed guide blades with the tooling and perform overall fine machining to complete the assembly.

[0046] Furthermore, step 2.2) specifically includes: installing the blade from the outer edge plate assembly to the inner edge plate assembly, adjusting the second blade positioning pad so that the gap between the blade and the first blade positioning pad and the second blade positioning pad is 0.02 to 0.1 mm, and then tightening the second blade positioning pad;

[0047] Step 3.1) specifically includes: using the upper and lower tenons as a reference, test-fit the third inner edge plate. During the test-fitting process, use a φ0.5-φ5 diamond grinding rod to trim the second and third window grilles, ensuring that the assembly clearance between the upper tenon and the third window grille and the lower tenon and the second window grille is 0.02-0.1mm; remove the third inner edge plate, install the pin into the pin hole of the upper tenon, and then install the third inner edge plate in place, ensuring that the gap between the blade body and the surface of the third inner edge plate is 0.02-0.1mm;

[0048] In step 3.2), before installing the first inner edge plate and the second inner edge plate, prefabricate pin holes for connection to the third inner edge plate on the first inner edge plate and the second inner edge plate using a 5-axis machining center. When installing the first inner edge plate and the second inner edge plate, use a diamond drill bit of corresponding specifications to drill pin holes on the third inner edge plate based on the prefabricated pin holes. Finally, use SiCf / SiC ceramic composite pins to rivet the first inner edge plate and the second inner edge plate to the third inner edge plate.

[0049] The assembly gap between the first window grille and the upper tenon and the profile fitting gap between the first inner edge plate and the third inner edge plate are ensured to be 0.02 to 0.1 mm;

[0050] In step 3.3), the gap between the inner edge plate positioning base and the inner edge plate pressing plate and the first inner edge plate is ensured to be 0.02 to 0.1 mm;

[0051] In step 4.1), the assembly clearance between the outer tenon and the fourth window grille and the profile fitting clearance between the blade body and the third outer edge plate are ensured to be 0.02 to 0.1 mm;

[0052] In step 4.2), before installing the first outer edge plate and the second outer edge plate, use a 5-axis machining center to pre-fabricate pin holes for connection with the third outer edge plate on the first outer edge plate and the second outer edge plate respectively; when installing the first outer edge plate and the second outer edge plate, use a diamond drill bit of corresponding specifications to drill pin holes for the third outer edge plate and the first outer edge plate and the second outer edge plate respectively on the third outer edge plate according to the pre-fabricated pin holes, and finally use SiC f / SiC ceramic composite pins rivet the first outer edge plate, the second outer edge plate and the third outer edge plate;

[0053] The said ensuring that the assembly gap between the outer tenon and the fifth window grille and the profile fitting gap between the first outer edge plate and the third outer edge plate are 0.02 to 0.1 mm;

[0054] In step 4.3), the gaps between the outer edge plate positioning base and the first outer edge plate, and between the outer edge plate pressing plate and the second outer edge plate are ensured to be 0.02 to 0.1 mm.

[0055] Step 5) is specifically as follows: the fixed guide blade of 4.3) is removed as a whole and SiC deposition is performed. After the deposition is completed, the internal connecting pins of the inner edge plate assembly and the outer edge plate assembly are polished and trimmed respectively to ensure that the concave and convex amount at the pins is ≤0.1mm. Then the fixed guide blade is assembled with the tooling, and fine processing is performed using a vertical 3-axis vertical machining center according to the set processing procedure to complete the assembly.

[0056] Beneficial effects of the present invention:

[0057] 1. The ceramic-based composite single-joint fixed guide vane tooling of the present invention, the inner edge plate pressure plate, the outer edge plate pressure plate, the first blade body positioning pad, the second blade body positioning pad, the inner edge plate positioning base, and the outer edge plate positioning base are matched with the installation angle and fitting surface height of the corresponding components of the fixed guide vane, and the fixed guide vane can be accurately positioned; at the same time, the corresponding installation sequence of the designed tooling is the assembly sequence from the blade body to the inner edge plate assembly and then to the outer edge plate assembly, and open assembly is adopted, so the interference between the various components is small, and the corresponding components can be repaired during the assembly process to improve the assembly accuracy; in addition, the present invention improves the assembly quality while ensuring the dimensional accuracy of the fixed guide vane by accurately controlling the fitting gap between the various components of the tooling and the fixed guide vane.

[0058] 2. The ceramic-based composite material single-joint fixed guide vane fixture of the present invention has a simple structure, is easy to operate, has accurate and reliable positioning, good stability, and a reasonable design, ensuring minimal interference between components and a large operating space.

[0059] 3. The ceramic-based composite material single-unit fixed guide vane tooling of the present invention is respectively provided with a first mounting groove, a second mounting groove and a third mounting groove on the base, which can be used to position and install the inner edge plate positioning base, the first blade body positioning pad, the second blade body positioning pad and the outer edge plate positioning base, making the operation convenient and fast and the positioning accurate.

[0060] 4. In the ceramic-based composite single-joint fixed guide vane fixture of the present invention, the first mounting groove, the second mounting groove and the third mounting groove are dovetail mounting grooves or T-slots, which facilitate installation and positioning and improve installation reliability.

[0061] 5. The ceramic-based composite single-joint fixed guide vane tooling of the present invention has weight-reducing grooves on the surfaces where the inner edge plate pressure plate, the outer edge plate pressure plate, the first blade body positioning pad, the second blade body positioning pad, the inner edge plate positioning base and the outer edge plate positioning base contact the fixed guide vane surface. On the one hand, this reduces the fitting area between the tooling and the fixed guide vane, and on the other hand, it can effectively reduce the weight of the tooling.

[0062] 6. The ceramic-based composite material single-joint fixed guide vane assembly method of the present invention is simple to operate and has high assembly precision. It can realize the integration of assembly, processing and inspection, shorten the product production cycle and save production costs.

[0063] 7. The ceramic-based composite material single-joint fixed guide vane assembly method of the present invention adopts a method of prefabricating pin holes in advance and then guiding the holes in the later assembly process, which significantly improves the pin hole making accuracy and assembly accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1It is a schematic diagram of the structure of a single-unit fixed guide vane made of ceramic matrix composite material;

[0065] Figure 2 for Figure 1 Exploded diagram;

[0066] Figure 3 This is a schematic structural diagram of an embodiment of a single-unit fixed guide vane fixture made of ceramic-based composite material according to the present invention;

[0067] Figure 4 This is a schematic structural diagram of a base in an embodiment of a ceramic-based composite single-joint fixed guide vane fixture of the present invention;

[0068] Figure 5 This is a schematic structural diagram of the inner edge plate positioning base in an embodiment of a ceramic-based composite single-joint fixed guide vane fixture of the present invention;

[0069] Figure 6 This is a schematic structural diagram of the outer edge plate positioning base in an embodiment of a ceramic-based composite single-joint fixed guide vane tooling of the present invention;

[0070] Figure 7 This is a schematic structural diagram of the first blade body positioning pad in an embodiment of a ceramic matrix composite single-joint fixed guide vane fixture of the present invention;

[0071] Figure 8 This is a schematic structural diagram of the second blade body positioning pad in an embodiment of a ceramic matrix composite single-joint fixed guide vane fixture of the present invention;

[0072] Figure 9 Schematic diagram of the assembly of the first blade body positioning pad and the second blade body positioning pad in an embodiment of the method for assembling a single-joint fixed guide vane of a ceramic matrix composite material according to the present invention;

[0073] Figure 10 Schematic diagram of the assembly of a blade body in an embodiment of the method for assembling a single-joint fixed guide vane of a ceramic matrix composite material according to the present invention;

[0074] Figure 11 Schematic diagram of the assembly of the inner edge plate assembly in an embodiment of the method for assembling a single-jointed fixed guide vane of a ceramic matrix composite material according to the present invention: 11a is a schematic diagram of the assembly of the third inner edge plate, and 11b is a schematic diagram of the assembly of the first inner edge plate and the second inner edge plate;

[0075] Figure 12 This is a schematic diagram of the assembly of the inner edge plate positioning base in an embodiment of the ceramic matrix composite single-joint fixed guide vane assembly method of the present invention;

[0076] Figure 13Schematic diagram of the installation of the outer edge plate assembly in the embodiment of the ceramic matrix composite single-unit fixed guide vane assembly method of the present invention: 13a is a schematic diagram of the assembly of the third outer edge plate, and 13b is a schematic diagram of the assembly of the first outer edge plate and the second outer edge plate;

[0077] Figure 14 This is a schematic diagram of the assembly of the outer edge plate positioning base in an embodiment of the ceramic matrix composite single-joint fixed guide vane assembly method of the present invention.

[0078] Reference numerals:

[0079] 01-Blade body, 011-Upper tenon, 012-Lower tenon, 013-Outer tenon, 014-Blade body front curved surface; 02-Inner edge plate assembly, 021-First inner edge plate, 0211-First window grille, 0212-Step; 022-Second inner edge plate, 023-Third inner edge plate, 0231-Second window grille, 0232-Third window grille, 03-Outer edge plate assembly, 031-First outer edge plate, 0311-Upper raised structure, 0312-Lower raised structure, 0313-Fifth window grille, 032-Second outer edge plate, 0321-Bottom raised structure, 033-Third outer edge plate, 0331-Fourth window grille;

[0080] 1-base, 11-first mounting groove, 12-second mounting groove, 13-third mounting groove; 2-first blade positioning pad, 21-first curved surface, 3-second blade positioning pad, 31-second curved surface, 4-inner edge plate positioning base, 41-first protrusion, 42-second protrusion, 5-outer edge plate positioning base, 51-second avoidance groove, 52-first avoidance groove, 6-inner edge plate pressure plate, 7-outer edge plate pressure plate, 71-lower step surface, 72-upper step surface, 8-outer edge protrusion structure. DETAILED DESCRIPTION

[0081] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below with reference to the accompanying drawings and embodiments. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of the embodiments.

[0082] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0083] like Figure 3As shown, the present invention is a ceramic-based composite single-unit fixed guide vane tooling, comprising a base 1, an inner edge plate pressure plate 6, an outer edge plate pressure plate 7, and a first blade positioning pad 2, a second blade positioning pad 3, an inner edge plate positioning base 4, and an outer edge plate positioning base 5 fixedly arranged on the base 1.

[0084] like Figure 7 and Figure 8 As shown, the first blade positioning pad 2 is provided with a first curved surface 21 that is adapted to the rear curved surface of the blade; the second blade positioning pad 3 is provided with a second curved surface 31 that is adapted to the lower end of the front curved surface 014 of the blade; the first blade positioning pad 2 and the second blade positioning pad 3 are fixedly connected, so that the first curved surface 21 of the first blade positioning pad 2 and the second curved surface 31 of the second blade positioning pad 3 are spliced to form a groove for placing the blade 01, and the inner surface of the groove is fitted with the rear curved surface of the blade 01 and the lower end of the front curved surface 014 of the blade 01, and the curvature of the inner surface of the groove is highly adapted to the outer surface in contact with the blade 01, so that the position and angular direction of the blade 01 can be accurately positioned to ensure the accuracy requirement of the blade 01 as a reference. When assembled correctly, the gap between the tooling and the blade fitting surface can be guaranteed to be 0.02~0.2mm.

[0085] The inner edge plate positioning base 4 is used for supporting and assembling the inner edge plate assembly 02. Figure 5 As shown, the upper end of the inner sidewall of the inner edge plate positioning base 4 is provided with a first protrusion 41 extending inward. The angle of the upper end surface of the inner edge plate positioning base 4 and the angle of the first protrusion 41 are the same as the assembly angle of the inner edge plate assembly 02. The upper end surface of the inner edge plate positioning base 4 and the outermost stepped surface at the bottom of the first inner edge plate 021 have the same curvature. The upper end surface of the inner edge plate positioning base 4 is used to contact the outermost stepped surface at the bottom of the first inner edge plate 021, and the first protrusion 41 extends into the second inner edge plate 022. The outer side of the upper end of the inner edge plate positioning base 4 is provided with a second protrusion 42 extending upward. The height of the second protrusion 42 is 0.5 to 1 mm less than the thickness of the bottom end of the first inner edge plate 021.

[0086] The curvature of the bottom surface of the inner edge plate pressure plate 6 and the upper surface of the bottom end of the first inner edge plate 021 are the same; the inner edge plate pressure plate 6 and the upper end surface of the inner edge plate positioning base 4 are fixedly connected by bolts, so that the bottom surface of the inner edge plate pressure plate 6 is in press-contact with the upper surface of the second protrusion 42 and the upper surface of the bottom end of the first inner edge plate 021.

[0087] The outer edge plate positioning base 5 is used for supporting and assembling the outer edge plate assembly 03, such as Figure 6As shown, the angle of the upper end surface of the outer edge plate positioning base 5 is the same as the assembly angle of the outer edge plate assembly 03; the angle of the lower end surface of the outer edge plate pressure plate 7 is the same as the angle of the upper end surface of the outer edge plate positioning base 5. The lower end surface of the outer edge plate pressure plate 7 is provided with a step structure, and the lower step surface 71 of the step structure contacts the upper end surface of the outer edge plate positioning base 5, and the upper step surface 72 of the step structure forms a groove with the upper end surface of the outer edge plate positioning base 5. The height of the groove is slightly larger than the total thickness of the upper protruding structure 0311 and the bottom protruding structure 0321, and the width of the groove is the same as the width of the upper protruding structure 0311 and the bottom protruding structure 0321. During the assembly process, the groove clamps the protruding structure 0311 on the first outer edge plate 031 and the protruding structure 0321 on the bottom of the second outer edge plate 032 to ensure the assembly accuracy requirements; the lower surface of the groove is in contact with the lower surface of the protruding structure 0311 on the first outer edge plate 031; the upper surface of the groove is in contact with the upper surface of the protruding structure 0321 on the bottom of the second outer edge plate 032. The upper end of the inner sidewall of the outer edge plate positioning base 5 is provided with a first avoidance groove 52 for the outer tenon 013 to avoid, and the lower end of the inner sidewall of the outer edge plate positioning base 5 is provided with a second avoidance groove 51 for the lower protrusion structure 0312 of the first outer edge plate 031 to avoid. The second avoidance groove 51 is a U-shaped groove. The angle of the U-shaped groove is the same as the assembly angle of the lower protrusion structure 0312 of the first outer edge plate 031. The depth of the U-shaped groove is greater than the width of the lower protrusion structure 0312 of the first outer edge plate 031, ensuring that the outer edge plate positioning base 5 does not interfere with the external aid component 03. The outer edge plate pressure plate 7 is fastened to the upper end surface of the outer edge plate positioning base 5 by bolts, ensuring that the clamping groove clamps the upper protrusion structure 0311 of the first outer edge plate 031 and the lower protrusion structure 0321 of the second outer edge plate 032 into contact.

[0088] In order to facilitate installation and accurate and rapid positioning, the base 1 is provided with a first mounting groove 11 for mounting the inner edge plate positioning base 4, a second mounting groove 12 for mounting the first blade positioning pad 2 and the second blade positioning pad 3, and a third mounting groove 13 for mounting the outer edge plate positioning base 5 in sequence along the length direction. Figure 4As shown. The lower ends of the first blade positioning pad 2, the second blade positioning pad 3, the inner edge plate positioning base 4 and the outer edge plate positioning base 5 are all provided with an outer edge protrusion structure 8 extending outward. The outer edge protrusion structures 8 of the first blade positioning pad 2, the second blade positioning pad 3, the inner edge plate positioning base 4 and the outer edge plate positioning base 5 are respectively fixedly connected to the corresponding mounting grooves on the base 1 by bolts. Among them, the first mounting groove 11, the second mounting groove 12 and the third mounting groove 13 can be configured as a dovetail mounting groove or a T-shaped T-slot with a groove bottom structure of a dovetail type. In this embodiment, the first mounting groove 11, the second mounting groove 12 and the third mounting groove 13 are all configured as dovetail mounting grooves, and the angle between the side surface and the bottom surface of the dovetail mounting groove is 85°, so that the corresponding components can be accurately positioned at the designed position in the groove. The bottom ends of the inner edge plate positioning base 4, the first blade positioning pad 2, the second blade positioning pad 3, and the outer edge plate positioning base 5 are respectively provided with structures that cooperate with the dovetail-type mounting grooves, so that the inner edge plate positioning base 4, the first blade positioning pad 2, the second blade positioning pad 3, and the outer edge plate positioning base 5 respectively form a sliding connection with the corresponding first mounting groove 11, the second mounting groove 12, and the third mounting groove 13. During installation, in order to quickly position and install the inner edge plate positioning base 4, this embodiment provides positioning pin holes on the outer edge structure 8 of the inner edge plate positioning base 4, and the base 1 is provided with positioning pin holes corresponding to the positioning pin holes of the inner edge plate positioning base 4. The inner edge plate positioning base 4 is positioned and installed by inserting pins into the positioning pin holes of the inner edge plate positioning base 4 and the positioning pin holes on the base 1 in sequence.

[0089] During the installation process, in order to prevent the gap between the first blade positioning pad 2 and the second blade positioning pad 3 from being too large, the first blade positioning pad 2 and the second blade positioning pad 3 are respectively provided with bolt holes at the positions below the groove. The first blade positioning pad 2 and the second blade positioning pad 3 are fastened by screwing bolts into the bolt holes of the first blade positioning pad 2 and the second blade positioning pad 3, ensuring seamless connection of the grooves and effectively improving the assembly accuracy of the blade 01.

[0090] The base 1 provides a positioning and installation reference for the entire tooling. The diameter of the pin hole on the base 1 is 4 mm, the specification of the bolt hole is M6, and both the pin hole and the bolt hole are through holes.

[0091] When installing the inner edge plate positioning base 4 and the outer edge plate positioning base 5, the fit between the tooling surface and the fixed guide blade surface should be observed at any time. If the fit clearance requirements are not met, the surface of the product parts should be partially trimmed in time to meet the final surface fit clearance requirements. After the inner edge plate positioning base 4 and the outer edge plate 5 positioning base are installed in place, use positioning pins and M6 fastening bolts for positioning and tightening, and then install the inner edge plate pressure plate 6 and the outer edge plate pressure plate 7 respectively.

[0092] The first curved surface 21 on the first blade positioning pad 2 and the second curved surface 31 on the second blade positioning pad 3 can be designed as an integral shape, but while ensuring the positioning accuracy, the contact area between the blade outer surface and the tooling should be minimized. Therefore, in other embodiments, multiple weight-reducing grooves can also be provided on the first curved surface 21 and the second curved surface 31. For example, the surface can be designed to be serrated or hollow, which can reduce the overall weight of the tooling.

[0093] At the same time, the present invention also provides a method for assembling a ceramic matrix composite material single-joint fixed guide blade based on the above-mentioned ceramic matrix composite material single-joint fixed guide blade tooling, comprising the following steps:

[0094] 1) Check the surfaces of the blade 01, inner edge plate assembly 02 and outer edge plate assembly 03 to ensure they are clean and smooth;

[0095] Check whether the single-unit fixed guide blade parts and tooling components are complete, check whether there are slag, uncleaned burrs, incomplete root cleaning and other problems on the surface of the single-unit fixed guide blade parts, check and trim the installation slots, bolt holes, positioning pin holes and burrs on the corners of the tooling.

[0096] 2) Installation of blade 01

[0097] 2.1) Fix and install the first blade positioning pad 2. According to the design value, adjust the distance between the bottom of the first blade positioning pad 2 and the right-angled side of the base 1 to determine a reference position. After adjusting it into place, use M6 bolts to tighten the first blade positioning pad 2; using the first blade positioning pad 2 as a reference, screw the M6 bolts on the second blade positioning pad 3 into the bolt holes on the base 1 for pre-fixation. Pre-fixation means that the second blade positioning pad 3 does not need to be tightened at this time to ensure that the blade positioning pad 3 can be moved during the subsequent position adjustment process. The assembly diagram of the first blade positioning pad and the second blade positioning pad is as shown in the figure. Figure 9 shown.

[0098] 2.2) If Figure 10 As shown, install the blade 01 to the groove position in the direction from the outer edge plate assembly 03 to the inner edge plate assembly 02, and adjust the second blade positioning pad 3 so that the surface fitting clearance between the blade 01 and the first blade positioning pad 2 and the second blade positioning pad 3 is 0.02 to 0.2 mm, preferably 0.02 to 0.1 mm; then tighten the bolts on the second blade positioning pad 3;

[0099] In order to ensure that the blade 01 is not squeezed by the first blade positioning pad 2 and the second blade positioning pad 3, and to reduce the adjustment amount of the second blade positioning pad 3, the present embodiment selects the direction of installation from the outer edge plate assembly 3 to the inner edge plate assembly 2. By adjusting the second blade positioning pad 3, the gap between the outer surface of the blade 01 and the surface of the first blade positioning pad 2 and the second blade positioning pad 3 is 0.02 to 0.2 mm, and the preferred gap is 0.02 to 0.1 mm. The cross section of the blade 01 is non-uniform, and the cross section gradually increases from the inside to the outside. During the movement from the outside to the inside, the blade will be restricted by the blade positioning pad tooling. Therefore, the beneficial effect of the first blade positioning pad 2 and the second blade positioning pad 3 designed in the present invention is that they can limit the angular direction of the blade 01 while also limiting its position.

[0100] 3) Installation of inner edge plate assembly 02

[0101] 3.1) With the upper tenon 011 and the lower tenon 012 as a reference, the third inner edge plate 023 is trial-fitted. During the trial-fitting process, if it cannot be installed in place, use a diamond grinding rod of φ0.5 to φ5 to trim the second window grille 0231 and the third window grille 0232 to ensure that the assembly clearance between the upper tenon 011 and the third window grille 0232 and the lower tenon 012 and the second window grille 0231 is 0.02 to 0.2 mm, and the preferred clearance is 0.02 to 0.1 mm; in order to ensure the continuity of the fiber cloth layer on the inner and outer surfaces of the blade body 01, the present invention selects the option of trimming the window grille size on the inner edge plate assembly 02 during the assembly process of the inner edge plate assembly 02 and the blade body 01. Take out the third inner edge plate 023, insert the pin into the pin hole of the upper tenon 011, and then install the third inner edge plate 023 in place, ensuring that the gap between the blade body 1 and the profile of the third inner edge plate 023 is 0.02 to 0.2 mm, preferably 0.02 to 0.1 mm. The assembly of the third inner edge plate 023 is as follows: Figure 11 a.

[0102] 3.2) Use a 5-axis machining center to pre-fabricate pin holes connected to the third inner edge plate 023 on the first inner edge plate 021 and the second inner edge plate 022 in advance; install the first inner edge plate 021 and the second inner edge plate 022, and trim the first window grille 0211 during the installation process to ensure that the assembly gap between the first window grille 0211 and the upper tenon 011 and the surface fitting gap between the first inner edge plate 021 and the third inner edge plate 023 are both 0.02 to 0.2 mm, preferably 0.02 to 0.1 mm; according to the pre-fabricated pin holes, use a diamond drill bit of corresponding specifications to respectively draw pin holes on the third inner edge plate 023 and the first inner edge plate 021 and the second inner edge plate 022, and finally use SiC f / SiC ceramic composite pins rivet the first inner edge plate 021, the second inner edge plate 022 and the third inner edge plate 023, such as Figure 11 As shown in b.

[0103] The edge plate profile of a single-jointed fixed guide vane is curved or cambered, and the edge plate is typically divided into multiple pieces connected by riveting. The position and angular orientation of the pin holes during this process play a decisive role in the riveting quality of the edge plates. Currently, because individual pin holes cannot be fully aligned when processed, affecting the riveting process, the method of preparing pin holes based on actual conditions during assembly is typically adopted. However, the position and angular accuracy of the pin holes prepared in this manner cannot be guaranteed, significantly impacting the riveting quality of the edge plates. The present invention employs a method of first prefabricating pin holes on the outer edge plate using a 5-axis machining center, and then guiding the pin holes on the remaining edge plates through the prefabricated pin holes. This method improves the position accuracy of the pin holes to ±0.1mm, ensuring the riveting quality of the edge plates.

[0104] 3.3) Install the inner edge plate positioning base 4 and the inner edge plate pressing plate 6 in sequence, adjust the inner edge plate positioning base 4 so that its upper inclined surface fits with the inner step bottom surface of the inner edge plate assembly 02, and then use the inner edge plate pressing plate 6 to fix and press the inner edge plate assembly 02 to ensure that the inner edge plate positioning base 4 and the first inner edge plate 021 have a surface fitting gap of 0.02 to 0.2 mm, preferably a fitting gap of 0.02 to 0.1 mm; the assembly reference of the inner edge plate positioning base 4 Figure 12 .

[0105] The position of the inner edge plate positioning base 4 is designed to be adjustable left and right. After controlling the fitting gap between it and the inner edge plate assembly 02 to be 0.02~0.2mm, it is tightened. This method not only ensures the fitting gap between the tooling and the product, but also provides support for the inner edge plate assembly 02 by adjusting the position of the inner edge plate positioning base 4.

[0106] 4) Installation of outer edge plate assembly 03

[0107] 4.1) Reference Figure 13 a. Install the third outer edge plate 033 and trim the fourth window grille 0331 during the installation process to ensure that the assembly gap between the outer tenon 013 and the fourth window grille 0331 and the surface fitting gap between the blade body 01 and the third outer edge plate 033 are 0.02-0.2 mm, preferably 0.02-0.1 mm.

[0108] 4.2) Use a 5-axis machining center to pre-fabricate pin holes on the first outer edge plate 031 and the second outer edge plate 032 to connect with the third outer edge plate 033; Figure 13b. Install the first outer edge plate 031 and the second outer edge plate 032. During the installation process, trim the fifth window grille 0313 to ensure that the assembly gap between the outer tenon 013 and the fifth window grille 0313 and the surface fitting gap between the first outer edge plate 031 and the third outer edge plate 033 are 0.02-0.2mm, preferably 0.02-0.1mm; according to the prefabricated pin holes, use a diamond drill bit of corresponding specifications to respectively draw pin holes on the third outer edge plate 033 and the first outer edge plate 031 and the second outer edge plate 032, and finally use SiC f / SiC ceramic composite pins rivet the first outer edge plate 031, the second outer edge plate 032 and the third outer edge plate 033.

[0109] 4.3) Install the outer edge plate positioning base 5 and the outer edge plate pressing plate 7 in sequence. By adjusting the outer edge plate positioning base 5, ensure that the outer edge plate positioning base 5 and the first outer edge plate 031, the outer edge plate pressing plate 7 and the second outer edge plate 032 have a profile fitting gap of 0.02 to 0.2 mm, preferably a fitting gap of 0.02 to 0.1 mm. The assembly reference of the outer edge plate positioning base 5 is as follows: Figure 14 .

[0110] 5) Remove the fixed guide blade of 4.3) as a whole and place it in a dedicated CVI-SiC deposition furnace for SiC deposition. Use a dedicated profiling tool to fix it during the deposition process. After the deposition is completed, polish and trim the internal connecting pins of the inner edge plate assembly 2 and the outer edge plate assembly 3 respectively to ensure that the concave and convex amount at the pin is ≤0.1mm. Then assemble the fixed guide blade with the tooling, and use a vertical 3-axis vertical machining center for fine processing according to the set processing procedure to complete the assembly.

Claims

1. A ceramic matrix composite single-joint fixed guide vane fixture, characterized by: It comprises a base (1), an inner edge plate pressure plate (6), an outer edge plate pressure plate (7), and a first blade body positioning pad (2), a second blade body positioning pad (3), an inner edge plate positioning base (4), and an outer edge plate positioning base (5) fixedly arranged on the base (1); The first blade positioning pad (2) is provided with a first curved surface (21) adapted to the rear curved surface of the blade; The second blade positioning pad (3) is provided with a second curved surface (31) adapted to the lower end of the blade front curved surface (014); The first blade body positioning pad (2) and the second blade body positioning pad (3) are fixedly connected, so that the first curved surface (21) and the second curved surface (31) are spliced together to form a groove for accommodating the blade body (01), and the inner surface of the groove is in contact with the lower end of the blade body rear curved surface and the blade body front curved surface (014); The upper end of the inner side wall of the inner edge plate positioning base (4) is provided with a first protrusion (41) extending inward, the angle of the upper end surface of the inner edge plate positioning base (4) and the angle of the first protrusion (41) are the same as the assembly angle of the inner edge plate assembly (02), and the curvature of the upper end surface of the inner edge plate positioning base (4) and the outermost step surface of the bottom of the first inner edge plate (021) are the same; the upper end surface of the inner edge plate positioning base (4) is used to contact the outermost step surface of the bottom of the first inner edge plate (021), and the first protrusion (41) is used to extend into the second inner edge plate (022); A second protrusion (42) extending upward is provided on the outer side of the upper end of the inner edge plate positioning base (4), and the height of the second protrusion (42) is less than the thickness of the bottom end of the first inner edge plate (021) by 0.5-1 mm; The bottom surface of the inner edge plate pressure plate (6) and the upper surface of the bottom end of the first inner edge plate (021) have the same curvature; the inner edge plate pressure plate (6) is fixedly connected to the upper end surface of the inner edge plate positioning base (4), and the bottom surface of the inner edge plate pressure plate (6) is in tight contact with the upper surface of the second protrusion (42); The angle of the upper end surface of the outer edge plate positioning base (5) is the same as the assembly angle of the outer edge plate assembly (03); The lower end surface of the outer edge plate pressure plate (7) is provided with a step structure, the lower step surface (71) of the step structure contacts the upper end surface of the outer edge plate positioning base (5), and a slot is formed between the upper step surface (72) and the upper end surface of the outer edge plate positioning base (5), and the shape of the slot is adapted to the shape of the upper protruding structure (0311) of the first outer edge plate (031) and the lower end protruding structure (0321) of the second outer edge plate (032); The lower surface of the slot is used to fit in contact with the lower surface of the upper protruding structure (0311), and the upper surface is used to fit in contact with the upper surface of the bottom end protruding structure (0321); The upper end of the inner side wall of the outer edge plate positioning base (5) is provided with a first avoidance groove (52) for the outer tenon (013) to avoid, and the lower end of the inner side wall is provided with a second avoidance groove (51) for the lower protruding structure (0312) of the first outer edge plate (031) to avoid; The outer edge plate pressing plate (7) is fixedly connected to the upper end surface of the outer edge plate positioning base (5).

2. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 1, characterized in that: The lower ends of the first blade positioning pad (2), the second blade positioning pad (3), the inner edge plate positioning base (4) and the outer edge plate positioning base (5) are all provided with an outer edge protrusion structure (8) extending outward, and the first blade positioning pad (2), the second blade positioning pad (3), the inner edge plate positioning base (4) and the outer edge plate positioning base (5) are fixedly connected to the base (1) via the outer edge protrusion structure (8).

3. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 1 or 2, characterized in that: The base (1) is provided with a first mounting groove (11), a second mounting groove (12) and a third mounting groove (13) in sequence along the length direction; The inner edge plate positioning base (4) is arranged in the first installation groove (11); the first blade body positioning pad (2) and the second blade body positioning pad (3) are arranged in the second installation groove (12); and the outer edge plate positioning base (5) is arranged in the third installation groove (13).

4. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 3, characterized in that: The first mounting groove (11), the second mounting groove (12) and the third mounting groove (13) are dovetail mounting grooves or T-shaped grooves; The bottom ends of the inner edge plate positioning base (4), the first blade body positioning pad (2), the second blade body positioning pad (3) and the outer edge plate positioning base (5) are provided with structures that match the dovetail type mounting groove or the T-shaped groove, so that the inner edge plate positioning base (4), the first blade body positioning pad (2), the second blade body positioning pad (3) and the outer edge plate positioning base (5) are respectively slidably connected with the corresponding first mounting groove (11), the second mounting groove (12) and the third mounting groove (13).

5. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 4, characterized in that: The first mounting groove (11), the second mounting groove (12) and the third mounting groove (13) are all dovetail mounting grooves; The included angle between the side surface and the bottom surface of the dovetail type mounting groove is 85°.

6. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 5, characterized in that: A positioning pin hole is provided on the outer edge protrusion structure (8) of the inner edge plate positioning base (4), and a positioning pin hole corresponding to the positioning pin hole of the inner edge plate positioning base (4) is provided on the base (1). The inner edge plate positioning base (4) is positioned by inserting a pin into the positioning pin hole of the inner edge plate positioning base (4) and the positioning pin hole on the base (1) in sequence; The first blade positioning pad (2) and the second blade positioning pad (3) are respectively provided with bolt holes at positions below the groove, and the first blade positioning pad (2) and the second blade positioning pad (3) are fastened by screwing bolts into the bolt holes of the first blade positioning pad (2) and the second blade positioning pad (3).

7. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 6, characterized in that: The second avoidance groove on the outer edge plate positioning base (5) is a U-shaped groove, the angle of the U-shaped groove is the same as the assembly angle of the lower protruding structure (0312) of the first outer edge plate (031), and the depth of the U-shaped groove is greater than the width of the lower protruding structure (0312) of the first outer edge plate (031).

8. The ceramic matrix composite single-joint fixed guide vane fixture according to claim 7, characterized in that: The inner edge plate positioning base (4), the first blade body positioning pad (2), the second blade body positioning pad (3) and the outer edge protrusion structure (8) of the outer edge plate positioning base (5) are respectively fixedly connected to the base (1) by bolts; The outer edge plate pressure plate (7) is fixedly connected to the upper end surface of the outer edge plate positioning base (5) by bolts; The inner edge plate pressure plate (6) is fixedly connected to the upper end surface of the inner edge plate positioning base (4) by bolts; A plurality of weight-reducing grooves are respectively provided on the first curved surface (21) of the first blade positioning pad (2) and the second curved surface (31) of the second blade positioning pad (3).

9. A method for assembling a ceramic matrix composite single-joint fixed guide vane, based on the ceramic matrix composite single-joint fixed guide vane tooling according to any one of claims 1 to 8, characterized in that: The following steps are involved: 1) Check the surfaces of the blade body (01), inner edge plate assembly (02) and outer edge plate assembly (03) to ensure they are clean and smooth. 2) Installation of blade (01) 2.1) The first blade positioning pad (2) is fixedly installed, and the second blade positioning pad (3) is pre-fixed with the first blade positioning pad (2) as a reference; 2.2) Install the blade (01), adjust the second blade positioning pad (3) so that the gap between the blade (01) and the first blade positioning pad (2) and the second blade positioning pad (3) is 0.02-0.2 mm, and tighten the second blade positioning pad (3); 3) Installation of inner edge plate assembly (02) 3.1) Install the third inner edge plate (023). During the installation process, trim the second window grille (0231) and the third window grille (0232) to ensure that the assembly clearance between the upper tenon (011) and the third window grille (0232) and the lower tenon (012) and the second window grille (0231), as well as the surface fitting clearance between the blade body (01) and the third inner edge plate (023) are all 0.02~0.2mm; 3.2) Install the first inner edge plate (021) and the second inner edge plate (022), and trim the first window grille (0211) during the installation process to ensure that the assembly gap between the first window grille (0211) and the upper tenon (011) and the profile fitting gap between the first inner edge plate (021) and the third inner edge plate (023) are both 0.02 to 0.2 mm; 3.3) Install the inner edge plate positioning base (4) and the inner edge plate pressing plate (6) in sequence, and adjust the inner edge plate positioning base (4) to ensure that the gap between the inner edge plate positioning base (4) and the inner edge plate pressing plate (6) and the first inner edge plate (021) is 0.02~0.2mm; 4) Installation of outer edge plate assembly (03) 4.1) Install the third outer edge plate (033), and trim the fourth window grille (0331) during the installation process to ensure that the assembly gap between the outer tenon (013) and the fourth window grille (0331) and the surface fitting gap between the blade body (01) and the third outer edge plate (033) are 0.02~0.2mm; 4.2) Install the first outer edge plate (031) and the second outer edge plate (032). During the installation process, trim the fifth window grille (0313) to ensure that the assembly gap between the outer tenon (013) and the fifth window grille (0313) and the surface fitting gap between the first outer edge plate (031) and the third outer edge plate (033) are 0.02~0.2mm; 4.3) Install the outer edge plate positioning base (5) and the outer edge plate pressure plate (7) in sequence, and adjust the outer edge plate positioning base (5) to ensure that the surface fitting clearances between the outer edge plate positioning base (5) and the first outer edge plate (031), and between the outer edge plate pressure plate (7) and the second outer edge plate (032) are 0.02~0.2mm; 5) Remove the fixed guide vane from 4.3) as a whole and perform SiC deposition. After deposition, polish and trim it. Then, assemble the fixed guide vane with the tooling and perform overall fine machining to complete the assembly.

10. The method for assembling a single-joint fixed guide vane of a ceramic matrix composite material according to claim 9, characterized in that: Step 2.2) is specifically as follows: installing the blade (01) in the direction from the outer edge plate assembly (03) to the inner edge plate assembly (02), adjusting the second blade positioning pad (3) so that the gap between the blade (01) and the first blade positioning pad (2) and the second blade positioning pad (3) is 0.02 to 0.1 mm, and then tightening the second blade positioning pad (3); Step 3.1) is specifically as follows: with the upper tenon (011) and the lower tenon (012) as references, the third inner edge plate (023) is trial-fitted. During the trial-fitting process, a φ0.5~φ5 diamond grinding rod is used to trim the second window grille (0231) and the third window grille (0232), ensuring that the assembly clearance between the upper tenon (011) and the third window grille (0232) and the lower tenon (012) and the second window grille (0231) is 0.02~0.1mm; take out the third inner edge plate (023), install the pin into the pin hole of the upper tenon (011), and then install the third inner edge plate (023) in place, ensuring that the profile fitting clearance between the blade body (01) and the third inner edge plate (023) is 0.02~0.1mm; In step 3.2), before installing the first inner edge plate (021) and the second inner edge plate (022), use a 5-axis machining center to pre-fabricate pin holes for connection with the third inner edge plate (023) on the first inner edge plate (021) and the second inner edge plate (022); when installing the first inner edge plate (021) and the second inner edge plate (022), use a diamond drill bit of corresponding specifications to pre-fabricate pin holes for the third inner edge plate (023) and the first inner edge plate (021) and the second inner edge plate (022) on the third inner edge plate (023) according to the pre-fabricated pin holes, and finally use SiC f / SiC ceramic composite pins are used to rivet the first inner edge plate (021), the second inner edge plate (022) and the third inner edge plate (023); The method ensures that the assembly clearance between the first window grille (0211) and the upper tenon (011) and the profile fitting clearance between the first inner edge plate (021) and the third inner edge plate (023) are both 0.02-0.1 mm; In step 3.3), the gap between the inner edge plate positioning base (4) and the inner edge plate pressing plate (6) and the first inner edge plate (021) is ensured to be 0.02-0.1 mm; In step 4.1), the assembly clearance between the outer tenon (013) and the fourth window grille (0331) and the profile fitting clearance between the blade body (01) and the third outer edge plate (033) are ensured to be 0.02-0.1 mm; In step 4.2), before installing the first outer edge plate (031) and the second outer edge plate (032), a 5-axis machining center is used to pre-fabricate pin holes for connection with the third outer edge plate (033) on the first outer edge plate (031) and the second outer edge plate (032); when installing the first outer edge plate (031) and the second outer edge plate (032), a diamond drill bit of corresponding specifications is used to pre-fabricate pin holes for the third outer edge plate (033) and the first outer edge plate (031) and the second outer edge plate (032) on the third outer edge plate (033), and finally SiC is used to drill the pin holes. f / SiC ceramic composite pins riveting the first outer edge plate (031), the second outer edge plate (032) and the third outer edge plate (033); The method ensures that the assembly gap between the outer tenon (013) and the fifth window grille (0313) and the profile fitting gap between the first outer edge plate (031) and the third outer edge plate (033) are 0.02-0.1 mm; In step 4.3), the gaps between the outer edge plate positioning base (5) and the first outer edge plate (031), and between the outer edge plate pressing plate (7) and the second outer edge plate (032) are ensured to be 0.02-0.1 mm; Step 5) is specifically as follows: the fixed guide blade of 4.3) is disassembled as a whole and SiC deposition is performed. After the deposition is completed, the internal connecting pins of the inner edge plate assembly (02) and the outer edge plate assembly (03) are polished and trimmed respectively to ensure that the concave and convex amount at the pins is ≤0.1mm. Then, the fixed guide blade is assembled with the tooling, and fine processing is performed using a vertical 3-axis machining center according to the set processing procedure to complete the assembly.

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