Ceramic-based composite material double fixed guide vane, tooling and assembly method

Abstract

The present invention relates to a twin fixed guide vane for an aero-engine, and specifically to a twin fixed guide vane made of ceramic matrix composite material, a tool and an assembly method. The technical problems of the existing twin fixed guide vanes, such as the difficulty in assembly, the large assembly gap and the lack of special tooling, are solved. The twin fixed guide vane of ceramic matrix composite material of the present invention comprises two blades, an inner edge plate assembly, an outer edge plate assembly and rivets. The inner edge plate assembly and the outer edge plate assembly adopt a split structure, which reduces the difficulty of installation while improving the assembly accuracy. The tooling of the present invention comprises a base, a detachable pad, a height detection block, an inner edge plate pressure plate, an outer edge plate pressure plate, an inner edge plate positioning base, a first blade positioning pad, a second blade positioning pad and an outer edge plate positioning base. The contact surfaces of the various parts of the tooling and the various parts of the twin fixed guide vane of ceramic matrix composite material are highly fitted, which reduces the installation gap, improves the assembly accuracy, and thus improves the final quality of the product.

Description

Technical Field

[0001] The invention relates to a double fixed guide vane for an aeroengine, and in particular to a double fixed guide vane made of ceramic-based composite material, a tool and an assembly method. Background Art

[0002] The main function of the fixed guide vane is to deflect the high-temperature and high-speed airflow ejected from the combustion chamber at a certain angle, so that it rushes to the high-pressure and low-pressure blades of the turbine. Through the high-speed rotation of the high-pressure and low-pressure blades of the turbine, the turbine shaft drives the compressor to rotate and circulate continuously, thereby continuously generating thrust. When working, the fixed guide vane needs to withstand high temperatures above 1300℃, extremely high thermal stress, gas stress, thermal strain and many complex corrosion.

[0003] SiC f / SiC ceramic matrix composites are considered to be the most ideal material for the hot end components of the sixth-generation aircraft engines. 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 vane. In addition, at present, the country is carrying out relevant research work on static scaled and proportional parts, among which SiC f The dual fixed guide vane of SiC ceramic matrix composite material is one of the key research objects at present. From aerodynamic design to assembly and production, the design and process need to be repeatedly explored and improved. f The tooling and assembly method of the double fixed guide vane of SiC ceramic matrix composite material is related to the final quality of the blade product, especially the control accuracy of the fitting clearance between the parts during the assembly process of the double fixed guide vane, which determines the limit of conditions that the fixed guide vane can withstand during service.

[0004] Chinese patent CN110966049 discloses a structure and molding of a fixed guide vane of a ceramic matrix composite material for an aero-engine, wherein the fixed guide vane comprises n blades, an upper edge plate assembly fixed to the top of the n blades, and a lower edge plate fixed to the bottom of the n blades. Since the overall size of the fixed guide vane is relatively small, the upper edge plate assembly and the lower edge plate of the fixed guide vane are both integral, which makes it difficult to assemble during the assembly process, and the gap after assembly is relatively large, making it difficult to ensure assembly accuracy, resulting in the final product being difficult to meet the use requirements.

[0005] In addition, the above SiC f / SiC ceramic-based composite double-fixed guide blades have a special and complex structure, small size and are difficult to assemble. Currently, there is no special tooling suitable for the fixed guide blades. Therefore, it is urgent to design a special tooling that can improve assembly accuracy and ensure product quality. Summary of the invention

[0006] The purpose of the present invention is to solve the technical problems that the existing double fixed guide blades are complex in structure, small in component size, difficult to assemble, and have large gaps after assembly, so that the final product cannot meet the use requirements, and there is currently no suitable special tooling, and to provide a ceramic-based composite material double fixed guide blade, tooling and assembly method.

[0007] The inventive concept of the present invention is based on the following problems existing in assembly: 1. The scaled-down parts of the double-jointed fixed guide blades are small in size (within 100 mm), which greatly limits the positioning reference surface and operating space, and it is impossible to accurately position the fixed guide blades; 2. The small-sized (about 1 mm) geometric features on the parts of the double-jointed fixed guide blades cannot be processed in place, and the machining accuracy of the parts is difficult to ensure. f / The matrix material of SiC ceramic-based composite material is SiC, which is a typical difficult-to-process material. It is difficult to process small-sized geometric features with existing diamond tools; 3. Due to the limitations of existing assembly processes, the assembly gap between the parts of the fixed guide blade is ≥0.2mm, and the assembly accuracy is low, which is difficult to meet the use requirements of the final product; and a specially designed ceramic-based composite double fixed guide blade, tooling and assembly method. The ceramic-based composite double fixed guide blade, tooling and assembly method provided by the present invention can significantly improve the assembly accuracy of the double fixed guide blade product.

[0008] The technical solution of the present invention is:

[0009] A ceramic-based composite double-jointed fixed guide vane comprises two blade bodies, an inner edge plate assembly, an outer edge plate assembly and a plurality of rivets; the special features thereof are:

[0010] The blade body comprises a front curved surface and a rear curved surface, and an inner tenon and an outer tenon are respectively arranged at two ends of the blade body;

[0011] The inner edge plate assembly includes a third inner edge plate, a first inner edge plate and a second inner edge plate respectively covering the upper outer surface and the lower outer surface of the third inner edge plate; the third inner edge plate is provided with two inner window grilles respectively matched with the two inner tenons, and the two inner tenons respectively pass through the two inner window grilles; the lower end of the first inner edge plate is provided with a first transverse boss extending outward, a notch is provided in the middle of the first transverse boss, and the first transverse boss is located above the two inner window grilles; the upper end surface of the second inner edge plate is provided with two grooves respectively matched with the two inner tenons, and the two inner tenons respectively pass through the two grooves; the two grooves are separated by a step protrusion structure, and the upper end surface of the step protrusion structure is in contact with the bottom surface of the first inner edge plate; the lower end surface of the second inner edge plate is located above the lower end surface of the third inner edge plate; the first inner edge plate and the second inner edge plate are riveted to the third inner edge plate by rivets respectively;

[0012] The outer edge plate assembly includes a first outer edge plate, a third outer edge plate and a second outer edge plate covering the outer surface of the first outer edge plate; the first outer edge plate is provided with two first outer window grilles respectively matched with the two outer tenons; the second outer edge plate is provided with two second outer window grilles respectively matched with the two outer tenons; the two outer tenons respectively pass through the first outer window grille and the second outer window grille in sequence; the lower end of the second outer edge plate is provided with a second horizontal boss extending outward, and the inner end of the third outer edge plate is provided with a protrusion extending upward; the side surface of the protrusion and the bottom surface of the third outer edge plate are respectively in contact with the outer side surface of the lower end of the second outer edge plate and the upper surface of the second horizontal boss; the first outer edge plate and the second outer edge plate and the second outer edge plate and the third outer edge plate are riveted together by rivets.

[0013] Furthermore, the raised mounting surface of the third outer edge plate is provided with tenon assembly grooves respectively matched with the bottom ends of the two outer tenons; the bottom ends of the two outer tenons are respectively inserted into the two tenon assembly grooves; the outer surface of the third inner edge plate is provided with a limiting line for positioning the lower end surface of the second inner edge plate; the upper end surfaces of the second inner edge plate respectively located on the outer sides of the two grooves are lower than the upper end surface of the step protrusion structure.

[0014] A tooling for assembling the above-mentioned ceramic matrix composite double fixed guide vane, which is special in that it includes: a base, a detachable pad, a height detection block, an inner edge plate pressure plate, an outer edge plate pressure plate, and an inner edge plate positioning base, a first blade body positioning pad, a second blade body positioning pad and an outer edge plate positioning base arranged on the base;

[0015] The upper end of the inner edge plate positioning base is a staircase structure, and from the inside to the outside, there are a first step, a second step, a third step, a fourth step and a fifth step; the step surfaces of the first step and the second step are respectively the same as the profile of the lower end surfaces of the third inner edge plate and the second inner edge plate, and the step surfaces of the first step and the second step are respectively used to fit with the lower end surfaces of the third inner edge plate and the second inner edge plate; the third step is used to avoid two inner tenons; the step surface of the fourth step is the same as the profile of the lower end surface of the first transverse boss, and the step surface of the fourth step is provided with a first boss adapted to the notch, and the upper end surface of the first boss is flush with the step surface of the fifth step; the step surface of the fourth step is used to fit with the lower end surface of the first transverse boss, and the first boss is used to insert into the notch; the side surface of the fourth step is the same as the profile of the outer side surface of the first transverse boss, and is used to fit with the outer side surface of the first transverse boss; the inner edge plate pressing plate is arranged on the fifth step, and is used to press the upper end surface of the first transverse boss tightly;

[0016] The first blade body positioning pad is provided with a first curved surface, which has the same profile as the rear curved surface of the blade body and is used to fit in contact with the middle part of the rear curved surface of one of the blade bodies;

[0017] The second blade positioning pad is provided with a second curved surface, the second curved surface has the same profile as the front curved surface of the blade, and is used to fit in contact with the middle part of the front curved surface of another blade;

[0018] The upper end surface of the detachable pad is used to fit and contact with the lower end surface of the second outer edge plate;

[0019] The upper end surface of the outer edge plate positioning base is detachably connected to the lower end surface of the detachable cushion block;

[0020] The outer edge plate pressure plate is arranged on the detachable pad and is used for pressing and contacting with the upper surface of the third outer edge plate;

[0021] The height detection block cooperates with the base and is used to detect the bottom height of the two outer tenons during the assembly process.

[0022] Furthermore, a first outer edge structure is provided on the outer side of the lower end of the inner edge plate positioning base, and the inner edge plate positioning base is fixedly connected to the base through the first outer edge structure; second outer edge structures are provided on the outer sides of the first blade positioning pad and the second blade positioning pad, and the first blade positioning pad and the second blade positioning pad are fixedly connected to the base through the corresponding second outer edge structures; third outer edge structures are provided on the two outer sides in the length direction of the lower end of the outer edge plate positioning base, and the outer edge plate positioning base is fixedly connected to the base through the two third outer edge structures.

[0023] Furthermore, a positioning hole is provided on the first outer edge structure, and a positioning pin hole corresponding to the positioning hole is provided on the base, and the positioning pin passes through the positioning hole and the positioning pin hole in sequence to position the inner edge plate positioning base.

[0024] Furthermore, a first assembly groove, a second assembly groove and a third assembly groove are provided in the middle part of the base; openings are provided on the edges of the first assembly groove and the second assembly groove; the first blade positioning pad and the second blade positioning pad are respectively arranged in the first assembly groove and the second assembly groove, and the first blade positioning pad and the second blade positioning pad are close to the lower end of the outer edge plate assembly at a right angle and are respectively in contact with the corresponding right angles of the first assembly groove and the second assembly groove; the bottom surface of the inner edge plate positioning base is provided with a card groove adapted to the bottom boss structure, and the bottom boss structure is snapped into the card groove; the outer sides of the first outer edge structure parallel to the base are respectively in contact with the corresponding outer sides of the first assembly groove and the second assembly groove, and the first outer edge structure is respectively fixedly connected to the base in the first assembly groove and the second assembly groove; the width of the third assembly groove is adapted to the width of the outer edge plate positioning base, and the outer edge plate positioning base is fixedly arranged in the third assembly groove.

[0025] Furthermore, the first assembly groove, the second assembly groove and the third assembly groove are all dovetail grooves or T-shaped grooves.

[0026] Furthermore, the first assembly groove, the second assembly groove and the third assembly groove are all dovetail grooves, and the angle between the side surface and the bottom surface of the dovetail groove is 85°.

[0027] At the same time, the present invention also provides an assembly method of the above-mentioned ceramic-based composite material double fixed guide blade, using the above-mentioned ceramic-based composite material double fixed guide blade tooling, which is special in that it includes the following steps:

[0028] 1) Assembly of inner edge plate

[0029] 1.1) First, assemble the inner edge plate positioning base, then assemble the first inner edge plate, and ensure that the profile gap between the contact surfaces is ≤0.2mm; finally, assemble the inner edge plate pressing plate;

[0030] 1.2) Using the two inner window grilles and the inner arc surface of the third inner edge plate as a reference, assemble the second inner edge plate and the third inner edge plate to ensure that the profile gap between the contact surfaces is ≤0.2mm;

[0031] 1.3) Assemble the second inner edge plate and the third inner edge plate as a whole and assemble them with the first inner edge plate to ensure that the profile gap between the contact surfaces is ≤0.2mm;

[0032] 2) Assembly of blade

[0033] 2.1) Assemble the first blade positioning pad, the second blade positioning pad and the height detection block in sequence;

[0034] 2.2) Assemble the two blades in sequence. During the assembly process, adjust the angles of the two blades to ensure that the gap between the blade and the first blade positioning pad or the second blade positioning pad is ≤0.2mm; grind the two inner tenons to ensure that the gap between the inner tenons and the corresponding inner window grilles is ≤0.2mm; grind the two outer tenons to ensure that the gap between the bottom platform of the outer tenons and the height detection block is ≤0.2mm;

[0035] 3) Assembly of outer edge plate

[0036] 3.1) Assemble the first outer edge plate, the second outer edge plate and the third outer edge plate in sequence, ensuring that the fitting gap between the profiles of the first outer edge plate, the second outer edge plate and the third outer edge plate is ≤0.2mm;

[0037] 3.2) Remove the height detection block, and assemble the first outer edge plate, the second outer edge plate and the third outer edge plate as a whole with the two blade bodies. During the assembly process, trim the outer tenon to ensure that the gap between the outer tenon and the first outer window grille and the second outer window grille is ≤0.2mm;

[0038] 3.3) Assemble the outer edge plate positioning base and the removable pad in sequence, ensuring that the gap between the outer edge plate assembly and the contact surfaces of the two blades and the removable pad is ≤0.2mm; then assemble the outer edge plate pressure plate;

[0039] 4) The double fixed guide blades of step 3.3) are disassembled as a whole and SiC deposition is performed. After the deposition is completed, the corresponding parts are polished and trimmed, and then the double fixed guide blades are reinstalled on the tooling for fine processing.

[0040] Further, in step 1.1), when assembling the inner edge plate positioning base, positioning pins are used for positioning installation;

[0041] Step 1.2) is as follows: prefabricate the pin holes connected to the first inner edge plate and the second inner edge plate on the third inner edge plate using a 5-axis machining center, align the second inner edge plate with the third inner edge plate based on the two inner window grilles, temporarily fix them with a C-type clamp, and then guide the pin holes on the second inner edge plate according to the prefabricated pin holes on the third inner edge plate, and fix the SiC f / SiC pins are passed through the pin holes of the second inner edge plate and the third inner edge plate in turn to rivet and assemble the two, and ensure that the profile gap between the contact surfaces is ≤0.1mm;

[0042] 1.3) Specifically: align the two ends of the third inner edge plate with the two ends of the first inner edge plate, adjust the upper and lower and front and rear positions of the second inner edge plate and the third inner edge plate assembly, and make the pin holes on the first inner edge plate according to the prefabricated pin holes on the third inner edge plate. f / SiC pins are passed through the pin holes of the second inner edge plate and the third inner edge plate in turn to rivet the two together, and the profile gap between the contact surfaces is ensured to be ≤0.1mm;

[0043] Step 2.2) is specifically as follows: assemble the two blades in sequence, and during the assembly process, adjust the angles of the two blades to ensure that the gap between the blade and the first blade positioning pad or the second blade positioning pad is ≤0.1mm; grind the two inner tenons to ensure that the gap between the inner tenons and the corresponding inner window grilles is ≤0.1mm; grind the two outer tenons to ensure that the gap between the bottom platform surface of the outer tenons and the height detection block is ≤0.1mm;

[0044] Step 3.1) is specifically as follows: first, align the first inner edge plate and the second inner edge plate with the profile of the two end edges as a reference, use a C-type clamp to temporarily fasten the first inner edge plate and the second inner edge plate, then make pin holes on the first inner edge plate and the second inner edge plate, and then use a special pin to rivet the two together, ensuring that the gap between the contact surfaces of the first inner edge plate and the second inner edge plate is ≤0.1mm; then assemble the third outer edge plate, and align the tenon assembly groove of the third outer edge plate with the contour of the second outer window grille of the second outer edge plate. When a large gap is formed, grind the raised contact surface of the third outer edge plate to ensure that the gap between the contact surfaces of the third outer edge plate and the second outer edge plate is ≤0.1mm; the unevenness of the alignment of the tenon assembly groove with the contour of the second outer window grille is ≤0.1mm;

[0045] Step 4) is specifically as follows: the double fixed guide blade assembled in step 3.3) is loaded into a dedicated CVI-SiC deposition furnace and fixed using a profiling tool. After deposition is completed, the pins connecting the inner edge plate assembly and the outer edge plate assembly are polished and trimmed to ensure that the convexity and concavity at the pins is ≤0.1mm. The double fixed guide blade is then fixed to the tooling and fine-processed using a 3-axis machining center according to the set machining procedure.

[0046] The beneficial effects of the present invention are:

[0047] 1. The ceramic-based composite material double fixed guide vane of the present invention has an inner edge plate assembly and an outer edge plate assembly at both ends of the blade body adopt a split structure, the inner edge plate assembly is divided into a third inner edge plate, a first inner edge plate and a second inner edge plate, and the outer edge plate assembly is divided into a first outer edge plate, a second outer edge plate and a third outer edge plate, which greatly reduces the difficulty of installation. At the same time, the operating space between the components is increased, and the installation gap is easy to adjust, so that the assembly accuracy is significantly improved, thereby ensuring the final product quality of the double fixed guide vane.

[0048] 2. In the ceramic-based composite double fixed guide vane of the present invention, the end surface heights at both ends of the second inner edge plate are designed to be the minimum value of the required depth of the groove, so as to reduce the overall weight of the double fixed guide vane.

[0049] 3. The ceramic-based composite material double-fixed guide blade tooling of the present invention has a simple structure, and the contact surfaces of the various parts of the tooling and the various parts of the double-fixed guide blades are highly fitted, thereby ensuring the assembly accuracy of the tooling of the double-fixed guide blades; at the same time, the tooling is reasonably designed so that the operating space during the installation process is large enough, and corrections and improvements can be made in time for places with large fitting gaps to further improve the assembly accuracy; in addition, the height detection block in the tooling of the present invention is a theoretical design height, which provides a basis for the repair of the external tenon and facilitates the subsequent rapid installation of the outer edge plate assembly.

[0050] 4. The base of the ceramic-based composite material double-fixed guide vane tooling of the present invention is provided with a first assembly groove, a second assembly groove and a third assembly groove for installing other tooling parts, which provide an installation positioning reference for repeated disassembly and installation of corresponding tooling parts during actual operation, thereby reducing the difficulty of operation.

[0051] 5. The assembly groove on the tooling base of the ceramic-based composite material double fixed guide vane of the present invention is set in a dovetail shape or T-shape, which prevents large-scale movement or position change of each tooling part during assembly and reduces the probability of damage to the fixed guide vane due to unstable tooling installation.

[0052] 6. The assembly method of the ceramic-based composite material double fixed guide vane of the present invention follows the assembly sequence from the inner edge plate assembly to the blade body and then to the outer edge plate assembly, combined with the form of the inner edge plate and the outer edge plate sub-assembly, simplifies the assembly process of the double fixed guide vane, and simplifies the repair problem between individual parts on the final assembly tooling during the final assembly process into the assembly problem between the various components. The fitting gap between the parts and the angular accuracy of the two blade bodies are the key points of attention during the entire assembly process, thereby improving the assembly quality while ensuring the product dimensional accuracy.

[0053] 7. The assembly method of the ceramic-based composite double-jointed fixed guide vane of the present invention adopts a prefabricated pin hole method. Before the riveting process of the edge plate assembly, a 5-axis machining center is used to prepare the pin holes, and then the pin holes on the remaining edge plate parts are guided according to the prefabricated pin holes, thereby improving the hole making accuracy of the pin holes.

[0054] 8. The assembly method of the ceramic-based composite double-fixed guide blade of the present invention provides a design idea and assembly method for the double-fixed guide blade tooling. The assembly method of the present invention can realize the integration of assembly, processing and inspection, shorten the product production cycle, and save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic structural diagram of an embodiment of a double-unit fixed guide vane of a ceramic-based composite material of the present invention;

[0056] Figure 2 for Figure 1 Exploded diagram of

[0057] Figure 3 The structure of the blade body in the embodiment of the ceramic matrix composite double fixed guide vane of the present invention is schematically shown. Figure 1 ;

[0058] Figure 4 The structure of the blade body in the embodiment of the ceramic matrix composite double fixed guide vane of the present invention is schematically shown. Figure 2 ;

[0059] Figure 5 It is a schematic structural diagram of an embodiment of a ceramic-based composite material double-jointed fixed guide vane tooling of the present invention;

[0060] Figure 6 It is a schematic structural diagram of the second blade body positioning pad in the embodiment of the ceramic-based composite material double-jointed fixed guide vane tooling of the present invention;

[0061] Figure 7 It is a schematic diagram of the assembly of the inner edge plate positioning base in the embodiment of the ceramic-based composite material double-connected fixed guide vane assembly method of the present invention;

[0062] Figure 8a It is a schematic diagram of assembling the first inner edge plate in an embodiment of the method for assembling a double-jointed fixed guide vane of a ceramic-based composite material according to the present invention;

[0063] Figure 8b It is a schematic diagram of assembling the second inner edge plate and the third inner edge plate in an embodiment of the method for assembling a double-connected fixed guide vane of a ceramic-based composite material according to the present invention;

[0064] Fig. 9It is a schematic diagram of assembling the first blade body positioning pad and the second blade body positioning pad in an embodiment of the ceramic matrix composite material double fixed guide vane assembly method of the present invention;

[0065] Fig.10 It is a schematic diagram of the assembly of a blade body in an embodiment of the method for assembling a double-jointed fixed guide vane of a ceramic-based composite material according to the present invention;

[0066] Fig.11 It is a schematic diagram of assembling a height detection block in an embodiment of the method for assembling a double-jointed fixed guide vane of a ceramic-based composite material of the present invention;

[0067] Fig.12a It is a schematic diagram of assembling the first outer edge plate and the second outer edge plate in an embodiment of the method for assembling a double-unit fixed guide vane of a ceramic-based composite material according to the present invention;

[0068] Figure 12b It is a schematic diagram of assembling the third outer edge plate in the embodiment of the ceramic-based composite material double-jointed fixed guide vane assembly method of the present invention;

[0069] Fig.13 It is a schematic diagram of the assembly of the outer edge plate pressure plate and the outer edge plate positioning base in the embodiment of the ceramic-based composite material double fixed guide vane assembly method of the present invention.

[0070] Reference numerals:

[0071] 01-blade body, 011-inner tenon, 012-outer tenon, 013-blade body front curved surface, 014-blade body rear curved surface; 02-inner edge plate assembly, 021-first inner edge plate, 0211-first transverse boss, 0212-notch, 022-second inner edge plate, 0221-groove, 0222-step protrusion structure, 023-third inner edge plate, 0231-inner window grille, 0232-limiting line; 03-outer edge plate assembly, 031-first outer edge plate, 0311-first outer window grille, 032-second outer edge plate, 0321-second transverse boss, 0322-second outer window grille, 033-third outer edge plate, 0331-protrusion, 0332-tenon assembly groove;

[0072] 1-base, 12-first assembly groove, 13-second assembly groove, 14-third assembly groove, 15-bottom boss structure; 2-inner edge plate positioning base, 21-first step, 22-second step, 23-third step, 24-fourth step, 241-first boss, 25-fifth step, 26-first outer edge structure, 261-positioning hole; 3-first blade positioning pad, 31-first curved surface; 4-second blade positioning pad, 41-second curved surface; 5-outer edge plate positioning base, 51-third outer edge structure; 6-removable pad; 7-height detection block; 8-inner edge plate pressure plate; 9-outer edge plate pressure plate; 10-second outer edge structure. DETAILED DESCRIPTION

[0073] The present invention is described in detail below through the accompanying drawings and embodiments.

[0074] The present invention discloses a ceramic-based composite material double-jointed fixed guide vane, comprising two blade bodies 01, an inner edge plate assembly 02, an outer edge plate assembly 03 and a plurality of rivets.

[0075] The blade body 01 includes a blade body front curved surface 013 and a blade body rear curved surface 014; an inner tenon 011 and an outer tenon 012 are respectively provided at both ends of the blade body 01;

[0076] The inner edge plate assembly 02 includes a third inner edge plate 023, a first inner edge plate 021 and a second inner edge plate 022 respectively covering the upper and lower parts of the outer surface of the third inner edge plate 023. The third inner edge plate 023 is a curved surface structure with convex inside and concave outside. The third inner edge plate 023 is provided with two inner window grilles 0231 respectively matched with the inner tenons 011 of the two blade bodies 01, and the two inner tenons 011 pass through the two inner window grilles 0231 respectively. The two end edges of the first inner edge plate 021 and the two end edges of the second inner edge plate 022 are respectively aligned with the two end edges of the third inner edge plate 023. The lower end of the first inner edge plate 021 is provided with a first transverse boss 0211 extending outward, a notch 0212 is provided in the middle of the first transverse boss 0211, and the first transverse boss 0211 is located above the two inner window grilles 0231. The upper end surface of the second inner edge plate 022 is provided with two grooves 0221 respectively matched with the two inner tenons 011, and the two inner tenons 011 respectively pass through the two grooves 0221; a step-protrusion structure 0222 is provided between the two grooves 0221, and the upper end surface of the step-protrusion structure 0222 contacts the bottom surface of the first inner edge plate 021, and the contact surfaces fit each other, and the step-protrusion structure 0222 plays a supporting role for the first inner edge plate 021. The lower end surface of the second inner edge plate 022 is located above the lower end surface of the third inner edge plate 023, and the two lower end surfaces form a trapezoidal structure. In order to facilitate installation and accurate positioning, a limit line 0232 of the lower end surface of the second inner edge plate 022 is provided on the outer side surface of the third inner edge plate 023. The first inner edge plate 021 and the second inner edge plate 022 are riveted to the third inner edge plate 023 respectively by rivets.

[0077] The outer edge plate assembly 03 includes a first outer edge plate 031, a second outer edge plate 032 covering the outer surface of the first outer edge plate 031, and a third outer edge plate 033. The two end edges of the second outer edge plate 032 are aligned with the two end edges of the first outer edge plate 031. The first outer edge plate 031 is a curved structure; the first outer edge plate 031 is respectively provided with a first outer window grille 0311 adapted to the two outer tenons 012; the second outer edge plate 032 is respectively provided with a second outer window grille 0322 adapted to the two outer tenons 012; the two outer tenons 012 respectively pass through the first outer window grille 0311 and the second outer window grille 0322 in sequence. The lower end of the second outer edge plate 032 is provided with a second transverse boss 0321 extending outward. The inner end of the third outer edge plate 033 is provided with a protrusion 0331 extending upward; the mounting surface profile of the protrusion 0331 is adapted to the outer side profile of the lower end of the second outer edge plate 032; the bottom surface profile of the third outer edge plate 033 is adapted to the upper surface profile of the second transverse boss 0321, and the mounting surface and bottom surface of the third outer edge plate 033 are respectively covered on the outer side surface of the lower end of the second outer edge plate 032 and the upper surface of the second transverse boss 0321. The mounting surface of the protrusion 0331 of the third outer edge plate 033 is provided with tenon assembly grooves 0332 respectively adapted to the bottom ends of the two outer tenons 012; the bottom ends of the two outer tenons 012 are respectively inserted into the two tenon assembly grooves 0332. The first outer edge plate 031 and the second outer edge plate 032, and the second outer edge plate 032 and the third outer edge plate 033 are riveted together by rivets.

[0078] At the same time, the present invention provides a tooling for assembling the above-mentioned ceramic-based composite material double fixed guide vane, including a base 1, a detachable pad 6, a height detection block 7, an inner edge plate pressure plate 8, an outer edge plate pressure plate 9, and an inner edge plate positioning base 2, a first blade body positioning pad 3, a second blade body positioning pad 4 and an outer edge plate positioning base 5 arranged on the base 1.

[0079] The inner edge plate positioning base 2 is used for assembling the inner edge plate assembly 02. The upper end of the inner edge plate positioning base 2 is a staircase structure, which is the first step 21, the second step 22, the third step 23, the fourth step 24 and the fifth step 25 from the inside to the outside. The step surface of the first step 21 and the second step 22 are respectively the same as the profile of the lower end surface of the third inner edge plate 023 and the second inner edge plate 022. The step surfaces of the first step 21 and the second step 22 are respectively used to fit with the lower end surfaces of the third inner edge plate 023 and the second inner edge plate 022. The third step 23 is used to avoid the inner tenons 011 of the two blade bodies 01. The step surface of the fourth step 24 is the same as the profile of the lower end surface of the first transverse boss 0211, and a first boss 241 matching the notch 0212 of the first transverse boss 0211 is arranged on the step surface of the fourth step 24, and the step surface of the fourth step 24 is used to fit with the lower end surface of the first transverse boss 0211, and the first boss 241 is inserted into the notch 0212; the side surface of the fourth step 24 is the same as the profile of the outer side surface of the first transverse boss 0211, and the side surface of the fourth step 24 is used to fit with the outer side surface of the first transverse boss 0211. In order to facilitate installation, a first outer edge structure 26 is arranged on the outer side of the lower end of the inner edge plate positioning base 2, and the inner edge plate positioning base 2 is fixedly connected to the base 1 through the first outer edge structure 26. In addition, a positioning hole 261 is provided on the first outer edge structure 26, and a positioning pin hole corresponding to the positioning hole 261 is provided on the base 1. The positioning pin passes through the positioning hole 261 and the positioning pin hole on the base 1 in turn to position the inner edge plate positioning base 2, which can be quickly and conveniently positioned and installed.

[0080] During use, the tooling of the present invention first relies on the first assembly groove 12 on the base 1 to limit the Z-axis direction of the inner edge plate positioning base 2, then adjusts the position of the inner edge plate positioning base 2 according to theoretical parameters, and then uses pins to position it, and then uses M6 bolts to tighten the inner edge plate positioning base 2.

[0081] The inner edge plate pressing plate 8 is fixedly connected to the step surface of the fifth step 25 and the first boss 241 , and the bottom surface of the inner edge plate pressing plate 8 is in pressing contact with the upper end surface of the first transverse boss 0211 .

[0082] The first blade positioning pad 3 is provided with a first curved surface 31, which has the same profile as the blade rear curved surface 014, and is used to fit in contact with the middle of the blade rear curved surface 014 of one of the blades 01. The second blade positioning pad 4 is provided with a second curved surface 41, which has the same profile as the blade front curved surface 013, and is used to fit in contact with the middle of the blade front curved surface 013 of another blade 01. The first blade positioning pad 3 and the second blade positioning pad 4 are used to position and angularly position the two blades during assembly. For ease of installation, the first blade positioning pad 3 and the second blade positioning pad 4 are respectively provided with second outer edge structures 10, and the first blade positioning pad 3 and the second blade positioning pad 4 are respectively fixedly connected to the base 1 through the corresponding second outer edge structures 10.

[0083] The first blade positioning pad 3 and the second blade positioning pad 4 are assembled after the inner edge plate assembly 02 is assembled. During the subsequent assembly of the blade 01, the fitting condition between the corresponding profile on the tooling and the profiles of the two blades 01 should be observed at any time. When the fitting clearance requirement is not met, the angle and position of the blade 01 should be adjusted by trimming the blade tenon to meet the final profile fitting clearance requirement.

[0084] The upper end surface of the removable pad 6 is used to fit and contact with the middle part of the lower end surface of the second outer edge plate 032. The upper end surface of the outer edge plate positioning base 5 is detachably connected to the lower end surface of the removable pad 6. The outer edge plate positioning base 5 is used to support the outer edge plate assembly 03. During installation, the outer edge plate positioning base 5 is assembled first, and then the removable pad 6 is assembled. When assembling the removable pad 6, if the lower end of the second outer edge plate 032 is too thick to be installed, the removable pad 6 can be pulled out in time, the bottom surface of the lower end of the second outer edge plate 032 is trimmed, and then the removable pad 6 is installed. The removable pad 6 is arranged here for easy operation. For easy installation, the two outer sides of the lower end of the outer edge plate positioning base 5 in the length direction are respectively provided with a third outer edge structure 51, and the outer edge plate positioning base 5 is fixedly connected to the base 1 through the two third outer edge structures 51.

[0085] The outer edge plate pressure plate 9 is fixedly connected to the outer edge plate positioning base 5 by bolts, and the bottom surface of the outer edge plate pressure plate 9 is in contact with the middle of the upper surface of the third outer edge plate 033; the height detection block 7 is used to support the two blade bodies 01 and detect the bottom height of the outer tenon 012 during the assembly process. The height of the height detection block 7 is the theoretical calculated height. Before installing the outer edge plate assembly 03, the height detection block 7 can be used to detect whether the height of the outer tenon 012 meets the standard. If it does not meet the standard, it is trimmed according to the height of the height detection block 7 so that the bottom end plane of the outer tenon 012 contacts the upper end surface of the height detection block 7.

[0086] The outer edge plate positioning base 5 and the removable pad 6 are assembled after the two blade bodies 01 are assembled. The height detection block 7 is removed, and then the outer edge plate positioning base 5 and the removable pad 6 are assembled to the base 1. After assembly, use positioning pins and M6 fastening bolts for positioning and tightening, and then assemble the outer edge plate assembly 03 and the outer edge plate pressure plate 9 in sequence.

[0087] In order to facilitate installation and accurate positioning, a first assembly groove 12, a second assembly groove 13 and a third assembly groove 14 are provided in the middle of the base 1. The width of the bottom boss structure 15 is the same as the distance between the first blade positioning pad 3 and the second blade positioning pad 4; the first blade positioning pad 3 and the second blade positioning pad 4 are respectively arranged in the first assembly groove 12 and the second assembly groove 13, and the first blade positioning pad 3 and the second blade positioning pad 4 are close to the lower end of the outer edge plate assembly 03. The right angle is respectively in contact with the corresponding right angles of the first assembly groove 12 and the second assembly groove 13; the bottom surface of the inner edge plate positioning base 2 is provided with a card groove adapted to the bottom boss structure 15, and the bottom boss structure 15 is inserted into the card groove; the outer sides of the first outer edge structure 26 parallel to the base 1 are respectively in contact with the corresponding outer sides of the first assembly groove 12 and the second assembly groove 13, and the first outer edge structure 26 is respectively fixedly connected to the groove bottoms of the first assembly groove 12 and the second assembly groove 13; the width of the third assembly groove 14 is adapted to the width of the outer edge plate positioning base 5, and the outer edge plate positioning base 5 is fixedly arranged in the third assembly groove 14. In order to reduce the movement of each tooling component and ensure installation accuracy, the first assembly groove 12, the second assembly groove 13 and the third assembly groove 14 are designed as dovetail grooves or T-shaped grooves. In this embodiment, the first assembly groove 12, the second assembly groove 13 and the third assembly groove 14 are all designed as dovetail grooves, and the angle between the side and the bottom of the dovetail groove is 85°. In order to match the dovetail groove on the base 1, the bottom of the inner edge plate positioning base 2, the outer edge plate positioning base 5, the first blade positioning pad 3 and the second blade positioning pad 4 are also designed as dovetail type; it can ensure that the installation position of the tooling components is highly stable and has low mobility. In addition, the diameter of the pin hole set on the base 1 is 4mm, and the specification of the bolt hole is M6.

[0088] The present invention also provides a method for assembling the ceramic matrix composite double fixed guide vane of the present invention by the above-mentioned tooling, comprising the following steps:

[0089] Before assembly, check whether the parts of the double fixed guide vane product and the parts of the tooling are complete, check whether there are scum on the surface of the product parts, uncleaned burrs, incomplete root cleaning and other problems, check and trim the assembly grooves, bolt holes, locating pin holes on the tooling, and burrs and other abnormalities at the edges and corners.

[0090] 1) Assembly of inner edge plate

[0091] 1.1) First, assemble the inner edge plate positioning base 2 and use the positioning pins for positioning and installation; then assemble the first inner edge plate 021, and make the lower end arc surface of the first transverse boss 0211 of the first inner edge plate 021 close to the corresponding arc surface on the inner edge plate positioning base 2, ensuring that the profile fitting gap between the contact surfaces is ≤0.2mm, preferably ≤0.1mm; then use the inner edge plate pressing plate 8 and the fastening bolts to fasten the first inner edge plate 021;

[0092] 1.2) Prefabricate the pin holes connected to the first inner edge plate 021 and the second inner edge plate 022 on the third inner edge plate 023 using a 5-axis machining center. Then, align the second inner edge plate 022 with the third inner edge plate 023 based on the two inner window grilles 0231 and the inner arc surface of the third inner edge plate 023. Use a C-type clamp to temporarily fix them. Then, guide the pin holes on the second inner edge plate 022 according to the prefabricated pin holes on the third inner edge plate 023. f / SiC pins are passed through the pin holes of the second inner edge plate 022 and the third inner edge plate 023 in sequence to rivet and assemble the two. After the riveting is completed, ensure that the profile fitting gap between the contact surfaces is ≤0.2mm, preferably ≤0.1mm;

[0093] 1.3) Align the two end edges of the third inner edge plate 023 with the two end edges of the first inner edge plate 021, adjust the upper and lower and front and rear positions of the second inner edge plate 022 and the third inner edge plate 023 according to the gap between the bottom platform surface and the bottom inner arc surface of the second inner edge plate 022 and the bottom platform surface and the bottom inner arc surface of the third inner edge plate 023 and the corresponding profiles on the inner edge plate positioning base 2, and guide the pin holes on the first inner edge plate 021 according to the prefabricated pin holes on the third inner edge plate 023, and place the SiC f / SiC pins are passed through the pin holes of the second inner edge plate 022 and the third inner edge plate 023 in sequence to rivet the two together. After the riveting is completed, ensure that the profile fitting gap between the contact surfaces is ≤0.2mm, preferably ≤0.1mm;

[0094] 2) Assembly of blade

[0095] 2.1) Install the first blade positioning pad 3 and the second blade positioning pad 4 into the corresponding assembly grooves on the base 1 from both ends, adjust the distance between the bottom of the first blade positioning pad 3 and the right-angled side of the side of the base 1 according to the design value, first determine a reference position, and use Φ4 pins and M6 bolts to position and tighten the first blade positioning pad 3 after adjusting it into place; use the same method and steps to install the Φ4 pins and M6 bolts on the second blade positioning pad 4 into the pins and bolt holes on the base 1, and finally install the height detection block 7 from the corresponding assembly groove on the base 1. It is only necessary to ensure that the bottom of the outer tenon 012 of the blade 01 can contact the height detection block 7, and there is no need to limit its left and right positions;

[0096] 2.2) Assemble two blade bodies 01 in sequence. During the assembly process, the angular directions of the two blade bodies 01 are adjusted to ensure that the profile fitting clearance between the blade body 01 and the first blade body positioning pad 3 or the second blade body positioning pad 4 is ≤0.2mm, and the profile fitting clearance is preferably ≤0.1mm; the two inner tenons 011 are ground to ensure that the clearance between the inner tenon 011 and the corresponding inner window grille 0231 is ≤0.2mm, and the clearance is preferably ≤0.1mm; the two outer tenons 012 are ground to ensure that the fitting clearance between the bottom platform surface of the outer tenon 012 and the height detection block 7 is ≤0.2mm, and the fitting clearance is preferably ≤0.1mm;

[0097] The difficulty in assembling the double-jointed fixed guide vane is that it is difficult to ensure the angular orientation of the two blades during the assembly process. When the blade angular orientation deviates, the matching accuracy between the two blade outer tenons 012 and the window grilles on the outer edge plate assembly 03 cannot be guaranteed. Therefore, accurately defining the angular position of the two blades can effectively improve the assembly accuracy of the double-jointed fixed guide vane. The profiles on the first blade positioning pad 3 and the second blade positioning pad 4 used in the present invention can accurately define the angular position of the blade. At the same time, by determining the fitting gap between the two blades 01 and the arc surface of the third inner edge plate 023, the position and angular orientation of the blade 01 can be further adjusted, which facilitates the assembly of the outer edge plate assembly 03.

[0098] 3) Assembly of outer edge plate

[0099] 3.1) First, use the profiles of the two ends of the first inner edge plate 021 and the second inner edge plate 022 as references to align them, use C-shaped clamps to temporarily fasten the first inner edge plate 021 and the second inner edge plate 022, then make pin holes on the first inner edge plate 021 and the second inner edge plate 022, and then use special pins to rivet the two together, ensuring that the gap between the contact surfaces of the first inner edge plate 021 and the second inner edge plate 022 is ≤0.2mm, preferably ≤0.1mm; then, the third outer edge plate 033 is fixed to the outer edge plate 034, and the second inner edge plate 035 is fixed to the outer edge plate 036. Assemble and align the tenon assembly groove 0332 of the third outer edge plate 033 with the contour of the second outer window grille 0322 of the second outer edge plate 032. When a large fitting gap appears, grind the side of the protrusion 0331 of the third outer edge plate 033 to ensure that the fitting gap between the contact surface of the third outer edge plate 033 and the second outer edge plate 032 is ≤0.2mm, preferably ≤0.1mm; the unevenness of the tenon assembly groove 0332 and the contour of the second outer window grille 0322 is ≤0.1mm.

[0100] 3.2) Remove the height detection block 7, and assemble the first outer edge plate 031, the second outer edge plate 032 and the third outer edge plate 033 as a whole with the two blade bodies 01. During the assembly process, trim the outer tenon 012 to ensure that the gap between the outer tenon 012 and the first outer window grille 0311 and the second outer window grille 0322 is ≤0.2 mm, and preferably ≤0.1 mm;

[0101] 3.3) Assemble the outer edge plate positioning base 5 and the removable pad 6 in sequence, ensuring that the fitting clearance between the outer edge plate assembly 03 and the contact surfaces of the two blade bodies 01 and the removable pad 6 is ≤0.2mm, and the preferred fitting clearance is ≤0.1mm; then assemble the outer edge plate pressure plate 9; make rivet pin holes on the inner tenon and outer tenon of the blade body 01 respectively, and then assemble the connecting pins into the rivet pin holes, so as to limit the inner edge plate assembly 02 and the outer edge plate assembly 03 to prevent them from falling off.

[0102] 4) Load the double fixed guide blade assembled in step 3.3) into the CVI-SiC deposition furnace and fix it with a profiling tool. After deposition is completed, grind and trim the pins connecting the inner edge plate assembly 02 and the outer edge plate assembly 03 to ensure that the concave and convex amount at the pin is ≤0.1mm. Then fix the double fixed guide blade to the tool and use a 3-axis machining center for fine processing according to the set processing procedure.

[0103] The edge plate profiles of the double-linked fixed guide vane are all curved or cambered, and the edge plates are divided into multiple pieces, which are connected by riveting. In this process, the position and angle of the pin holes play a decisive role in the riveting quality of the edge plates. At present, because the pin holes cannot be completely aligned when the pin holes are processed separately, the riveting process is affected. Usually, the method of preparing the pin holes according to the actual situation during the assembly process is adopted. The position and angular accuracy of the pin holes prepared in this way cannot be guaranteed, which has a great impact on the riveting quality of the edge plates. In the present invention, the pin holes are first prefabricated in advance on the outer edge plate using a 5-axis machining center, and then the pin holes on the remaining edge plates are guided by the prefabricated pin holes, so that the position accuracy of the pin holes is improved to ±0.1mm, ensuring the riveting quality of the edge plates.

Claims

1. A ceramic matrix composite material double fixed guide vane, comprising two blade bodies (01), an inner edge plate assembly (02), an outer edge plate assembly (03) and a plurality of rivets; Features: The blade body (01) comprises a blade body front curved surface (013) and a blade body rear curved surface (014), and an inner tenon (011) and an outer tenon (012) are respectively provided at two ends of the blade body (01); The inner edge plate assembly (02) comprises a third inner edge plate (023), a first inner edge plate (021) and a second inner edge plate (022) respectively covering the upper outer surface and the lower outer surface of the third inner edge plate (023); The third inner edge plate (023) is provided with two inner window grilles (0231) respectively matched with the two inner tenons (011), and the two inner tenons (011) respectively pass through the two inner window grilles (0231); A first transverse boss (0211) extending outward is provided at the lower end of the first inner edge plate (021), and a notch (0212) is provided in the middle of the first transverse boss (0211); The upper end surface of the second inner edge plate (022) is provided with two grooves (0221) respectively matched with the two inner tenons (011), and the two inner tenons (011) respectively pass through the two grooves (0221); The two grooves (0221) are separated by a stepped protrusion structure (0222), and the upper end surface of the stepped protrusion structure (0222) is in close contact with the bottom surface of the first inner edge plate (021); The lower end surface of the second inner edge plate (022) is located above the lower end surface of the third inner edge plate (023); The first inner edge plate (021) and the second inner edge plate (022) are riveted to the third inner edge plate (023) respectively by rivets; The outer edge plate assembly (03) comprises a first outer edge plate (031), a third outer edge plate (033) and a second outer edge plate (032) covering the outer surface of the first outer edge plate (031); The first outer edge plate (031) is provided with two first outer window grilles (0311) respectively matched with the two outer tenons (012); The second outer edge plate (032) is provided with two second outer window grilles (0322) respectively matched with the two outer tenons (012); The two outer tenons (012) respectively pass through the first outer window grille (0311) and the second outer window grille (0322) in sequence; The lower end of the second outer edge plate (032) is provided with a second transverse boss (0321) extending outward, and the inner end of the third outer edge plate (033) is provided with a protrusion (0331) extending upward; The side surface of the protrusion (0331) and the bottom surface of the third outer edge plate (033) are respectively in contact with the outer side surface of the lower end of the second outer edge plate (032) and the upper surface of the second transverse boss (0321); The first outer edge plate (031) and the second outer edge plate (032) as well as the second outer edge plate (032) and the third outer edge plate (033) are riveted together by rivets.

2. The ceramic matrix composite double fixed guide vane according to claim 1, characterized in that: Tenon assembly grooves (0332) respectively matched with the bottom ends of the two outer tenons (012) are arranged on the mounting surface of the protrusion (0331) of the third outer edge plate (033); the bottom ends of the two outer tenons (012) are respectively inserted into the two tenon assembly grooves (0332); A limiting line (0232) for positioning the lower end surface of the second inner edge plate (022) is provided on the outer side surface of the third inner edge plate (023); The upper end surfaces of the second inner edge plates (022) respectively located outside the two grooves (0221) are lower than the upper end surface of the step protrusion structure (0222).

3. A ceramic matrix composite material double fixed guide vane tooling, used for assembling the ceramic matrix composite material double fixed guide vane according to claim 1 or 2, characterized in that: It comprises a base (1), a detachable pad (6), a height detection block (7), an inner edge plate pressure plate (8), an outer edge plate pressure plate (9), and an inner edge plate positioning base (2), a first blade body positioning pad (3), a second blade body positioning pad (4) and an outer edge plate positioning base (5) arranged on the base (1); The upper end of the inner edge plate positioning base (2) is a staircase structure, which is composed of a first step (21), a second step (22), a third step (23), a fourth step (24) and a fifth step (25) from the inside to the outside; The step surfaces of the first step (21) and the second step (22) are respectively the same as the profiles of the lower end surfaces of the third inner edge plate (023) and the second inner edge plate (022), and are respectively used to fit with the lower end surfaces of the third inner edge plate (023) and the second inner edge plate (022); The third step (23) is used to avoid the two inner tenons (011); The step surface of the fourth step (24) is the same as the profile of the lower end surface of the first transverse boss (0211), and a first boss (241) adapted to the notch (0212) is arranged on the step surface, and the upper end surface of the first boss (241) is flush with the step surface of the fifth step (25); the step surface of the fourth step (24) is used to fit with the lower end surface of the first transverse boss (0211), and the first boss (241) is used to be inserted into the notch (0212); the side surface of the fourth step (24) is the same as the profile of the outer side surface of the first transverse boss (0211), and is used to fit with the outer side surface of the first transverse boss (0211); The inner edge plate pressing plate (8) is arranged on the fifth step (25) and is used to press the upper end surface of the first transverse boss (0211); The first blade positioning pad (3) is provided with a first curved surface (31), the first curved surface (31) having the same profile as the blade rear curved surface (014), and being used for fitting and contacting with the middle portion of the blade rear curved surface (014) of one of the blades (01); The second blade positioning pad (4) is provided with a second curved surface (41), the second curved surface (41) having the same profile as the blade front curved surface (013), and being used for fitting and contacting with the middle portion of the blade front curved surface (013) of another blade (01); The upper end surface of the detachable cushion block (6) is used to fit and contact with the lower end surface of the second outer edge plate (032); The upper end surface of the outer edge plate positioning base (5) is detachably connected to the lower end surface of the detachable cushion block (6); The outer edge plate pressure plate (9) is arranged on the detachable pad (6) and is used for pressing and contacting with the upper surface of the third outer edge plate (033); The height detection block (7) cooperates with the base (1) and is used to detect the bottom height of two external tenons (012) when assembling the ceramic-based composite material double fixed guide vane.

4. The ceramic matrix composite material double fixed guide vane tooling according to claim 3, characterized in that: A first outer edge structure (26) is provided on the outer side of the lower end of the inner edge plate positioning base (2), and the inner edge plate positioning base (2) is fixedly connected to the base (1) via the first outer edge structure (26); The outer sides of the first blade body positioning pad (3) and the second blade body positioning pad (4) are respectively provided with second outer edge structures (10), and the first blade body positioning pad (3) and the second blade body positioning pad (4) are respectively fixedly connected to the base (1) via the corresponding second outer edge structures (10); The two outer sides of the lower end of the outer edge plate positioning base (5) in the length direction are respectively provided with third outer edge structures (51), and the outer edge plate positioning base (5) is fixedly connected to the base (1) via the two third outer edge structures (51).

5. The ceramic matrix composite material double fixed guide vane tooling according to claim 4, characterized in that: The first outer edge structure (26) is provided with a positioning hole (261), and the base (1) is provided with a positioning pin hole corresponding to the positioning hole (261). The positioning pin passes through the positioning hole (261) and the positioning pin hole in sequence to position the inner edge plate positioning base (2).

6. The ceramic matrix composite material double fixed guide vane tooling according to claim 5, characterized in that: The base (1) is provided with a first assembly groove (12), a second assembly groove (13) and a third assembly groove (14) in the middle part; The edges of the first assembly groove (12) and the second assembly groove (13) are both provided with openings; The first blade positioning pad (3) and the second blade positioning pad (4) are respectively arranged in the first assembly groove (12) and the second assembly groove (13), and the right angles of the lower ends of the first blade positioning pad (3) and the second blade positioning pad (4) close to the outer edge plate assembly (03) are respectively in contact with the corresponding right angles of the first assembly groove (12) and the second assembly groove (13); The bottom surface of the inner edge plate positioning base (2) is provided with a slot adapted to the bottom boss structure (15), and the bottom boss structure (15) is inserted into the slot; The outer sides of the first outer edge structure (26) parallel to the base (1) are in contact with the corresponding outer sides of the first assembly groove (12) and the second assembly groove (13), and the first outer edge structure (26) is fixedly connected to the base (1) in the first assembly groove (12) and the second assembly groove (13); The width of the third assembly groove (14) matches the width of the outer edge plate positioning base (5), and the outer edge plate positioning base (5) is fixedly arranged in the third assembly groove (14).

7. The ceramic matrix composite material double fixed guide vane tooling according to claim 6, characterized in that: The first assembly groove (12), the second assembly groove (13) and the third assembly groove (14) are all dovetail grooves or T-shaped grooves.

8. The ceramic matrix composite material double fixed guide vane tooling according to claim 7, characterized in that: The first assembly groove (12), the second assembly groove (13) and the third assembly groove (14) are all dovetail grooves, and the angle between the side surface and the bottom surface of the dovetail groove is 85°.

9. A method for assembling a ceramic matrix composite double fixed guide vane according to claim 1 or 2, using a ceramic matrix composite double fixed guide vane tooling according to any one of claims 3 to 8, characterized in that: The following steps are involved: 1) Assembly of inner edge plate 1.1) First, assemble the inner edge plate positioning base (2), then assemble the first inner edge plate (021), and ensure that the profile fitting gap between the contact surfaces is ≤0.2mm; finally, assemble the inner edge plate pressing plate (8); 1.2) Using the two inner window grilles (0231) as a reference, assemble the second inner edge plate (022) and the third inner edge plate (023) to ensure that the profile gap between the contact surfaces is ≤0.2 mm; 1.3) Assemble the second inner edge plate (022) and the third inner edge plate (023) as a whole and assemble them with the first inner edge plate (021), ensuring that the profile gap between the contact surfaces is ≤0.2 mm; 2) Assembly of blade 2.1) Assembling the first blade positioning pad (3), the second blade positioning pad (4) and the height detection block (7) in sequence; 2.2) assembling two blade bodies (01) in sequence, and during the assembly process, adjusting the angles of the two blade bodies (01) to ensure that the gap between the blade body (01) and the first blade body positioning pad (3) or the second blade body positioning pad (4) is ≤0.2 mm; grinding the two inner tenons (011) to ensure that the gap between the inner tenons (011) and the corresponding inner window grilles (0231) is ≤0.2 mm; grinding the two outer tenons (012) to ensure that the gap between the bottom platform surface of the outer tenon (012) and the height detection block (7) is ≤0.2 mm; 3) Assembly of outer edge plate 3.1) Assemble the first outer edge plate (031), the second outer edge plate (032) and the third outer edge plate (033) in sequence, and ensure that the fitting gap between the profiles of the first outer edge plate (031), the second outer edge plate (032) and the third outer edge plate (033) is ≤0.2 mm; 3.2) The height detection block (7) is removed, and the first outer edge plate (031), the second outer edge plate (032) and the third outer edge plate (033) are assembled with the two blade bodies (01). During the assembly process, the outer tenon (012) is trimmed to ensure that the gap between the outer tenon (012) and the first outer window grille (0311) and the second outer window grille (0322) is ≤0.2 mm; 3.3) Assemble the outer edge plate positioning base (5) and the removable pad (6) in sequence, ensuring that the gap between the outer edge plate assembly (03) and the contact surfaces of the two blades (01) and the removable pad (6) is ≤0.2 mm; Then assemble the outer edge plate pressure plate (9); 4) The double fixed guide blades of step 3.3) are disassembled as a whole and SiC deposition is performed. After the deposition is completed, the corresponding parts are polished and trimmed, and then the double fixed guide blades are reinstalled on the tooling for fine processing.

10. The method for assembling a ceramic matrix composite double fixed guide vane according to claim 9, characterized in that: In step 1.1), when assembling the inner edge plate positioning base (2), use positioning pins for positioning and installation; Step 1.2) is specifically as follows: a pin hole for connecting the first inner edge plate (021) and the second inner edge plate (022) is prefabricated on the third inner edge plate (023) using a 5-axis machining center, and then the second inner edge plate (022) is aligned with the third inner edge plate (023) based on the two inner window grilles (0231), and temporarily fixed using a C-type clamp, and then the pin hole on the second inner edge plate (022) is guided according to the pin hole prefabricated on the third inner edge plate (023), and the SiC f / SiC pins are passed through the pin holes of the second inner edge plate (022) and the third inner edge plate (023) in sequence to rivet and assemble the two, and ensure that the profile gap between the contact surfaces is ≤0.1 mm; 1.3) Specifically, the two end edges of the third inner edge plate (023) are aligned with the two end edges of the first inner edge plate (021), the upper and lower and front and rear positions of the second inner edge plate (022) and the third inner edge plate (023) are adjusted to the right position, the pin holes on the first inner edge plate (021) are guided according to the prefabricated pin holes on the third inner edge plate (023), and the SiC f / SiC pins are passed through the pin holes of the second inner edge plate (022) and the third inner edge plate (023) in sequence to rivet the two together, and the profile gap between the contact surfaces is ensured to be ≤0.1 mm; Step 2.2) is specifically as follows: assembling two blade bodies (01) in sequence, and during the assembly process, adjusting the angles of the two blade bodies (01) to ensure that the gap between the blade body (01) and the first blade body positioning pad (3) or the second blade body positioning pad (4) is ≤0.1 mm; grinding the two inner tenons (011) to ensure that the gap between the inner tenons (011) and the corresponding inner window grilles (0231) is ≤0.1 mm; grinding the two outer tenons (012) to ensure that the gap between the bottom platform surface of the outer tenon (012) and the height detection block (7) is ≤0.1 mm; Step 3.1) is as follows: first, the first inner edge plate (021) and the second inner edge plate (022) are aligned with the profile of the two end edges as a reference, and the first inner edge plate (021) and the second inner edge plate (022) are temporarily fastened with a C-type clamp, and then pin holes are made on the first inner edge plate (021) and the second inner edge plate (022), and then the two are riveted with a special pin to ensure that the contact surface gap between the first inner edge plate (021) and the second inner edge plate (022) is ≤0.1 mm; then, the third outer edge plate (033) is fixed to the first inner edge plate (021) and the second inner edge plate (022). ) for assembly, and align the tenon assembly groove (0332) of the third outer edge plate (033) with the contour of the second outer window grille (0322) of the second outer edge plate (032); when a large gap is formed between the third outer edge plate (033), the contact surface of the protrusion (0331) of the third outer edge plate (033) is ground to ensure that the gap between the contact surfaces of the third outer edge plate (033) and the second outer edge plate (032) is ≤0.1 mm; and the unevenness of the alignment between the tenon assembly groove (0332) and the contour of the second outer window grille (0322) is ≤0.1 mm; Step 4) is specifically as follows: the double fixed guide blade assembled in step 3.3) is loaded into the CVI-SiC deposition furnace and fixed using a profiling tool. After deposition is completed, the pins connecting the inner edge plate assembly (02) and the outer edge plate assembly (03) are polished and trimmed to ensure that the concave and convex amount at the pin is ≤0.1mm. The double fixed guide blade is then fixed to the tool and fine-processed using a 3-axis machining center according to the set machining procedure.

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