Assembly method and tooling for ceramic matrix composite nozzle components

Abstract

This invention relates to the assembly of ceramic matrix composite nozzles, specifically to an assembly method and tooling for ceramic matrix composite nozzle components. To address the shortcomings of existing modular assembly methods for nozzle components, which easily lead to tolerance accumulation, lack of control over diagonal relationships, and difficulty in meeting assembly accuracy requirements, the assembly method of this invention includes steps such as fitting flange assemblies and the inner surfaces of reinforcing box assemblies, installing the nozzle body, installing and fitting flange assemblies and the outer surfaces of the reinforcing box, and vapor deposition, thereby completing the assembly of the ceramic matrix composite nozzle components. Simultaneously, the provided assembly tooling can be used to implement the above method, including a base plate, a first limiting block, a second limiting block, an outer pressure ring for the nozzle, and a pressure plate for the reinforcing box, etc., to position the nozzle body, flange assembly, and reinforcing box assembly during the assembly process.

Description

Technical Field

[0001] This invention relates to the assembly of ceramic matrix composite nozzles, and more specifically to the assembly method and tooling for ceramic matrix composite nozzle components. Background Technology

[0002] Ceramic matrix composites are a new type of strategic material with characteristics such as high temperature resistance, low density, high specific strength, high specific modulus, oxidation resistance, ablation resistance, insensitivity to cracking, and non-catastrophic damage. They have wide applications in aviation, aerospace, satellite aviation, nuclear energy, and photovoltaics. In recent years, with the development of high-performance engines, the combustion chamber temperature has been continuously increasing in order to improve the thrust-to-weight ratio. Existing alloy materials can no longer meet the high-temperature resistance requirements of next-generation engine nozzle components. Ultra-high temperature ceramic matrix composites have emerged as a key material for manufacturing high-performance engine nozzle components due to their superior high-temperature resistance.

[0003] Current ceramic matrix composite nozzle components are assembled from a 3DN rotary nozzle body, a 2D flange assembly (referred to as the flange assembly), and a reinforcing box assembly. The flange assembly and reinforcing box assembly, as load-bearing components, are connected to the nozzle body via composite pins. Due to the angular relationship between the reinforcing box assembly, flange assembly, and nozzle body, angular positioning errors are prone to occur. During nozzle assembly, high precision is required for the installation angles and connection hole positions of the flange assembly and reinforcing box assembly to ensure the nozzle component's strength, as well as the connection accuracy between the nozzle component and the engine, and the drilling accuracy of the composite pin holes. Traditional assembly methods use a modular approach, which easily leads to tolerance accumulation and lacks control over angular relationships, making it difficult to guarantee the above requirements. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing modular assembly methods for nozzle components, which easily lead to tolerance accumulation, lack of control over diagonal relationships, and difficulty in meeting assembly accuracy requirements. This invention provides a method and tooling for assembling ceramic matrix composite nozzle components.

[0005] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0006] A method for assembling a ceramic matrix composite nozzle component, characterized by the following steps:

[0007] Step 1: Fix the flange assembly on a base plate and process its inner surface to match the outer surface of the corresponding position of the nozzle body; the flange assembly includes one or more flanges, each flange is formed by splicing at least two arc-shaped structures and is temporarily fixed by adhesive bonding. After processing, the flange assembly is removed.

[0008] The reinforcing box assembly is fixed on the base plate, and its inner surface is processed to make it consistent with the outer surface of the corresponding position of the nozzle body. The reinforcing box assembly is formed by N reinforcing boxes arranged in sequence to form a ring structure, where N≥8. The side walls of two adjacent reinforcing boxes are attached to each other and temporarily fixed by adhesive. After processing, the reinforcing box assembly is removed.

[0009] Step 2: Install the nozzle body on the base plate, with the small end of the nozzle body facing the base plate and fitting against it;

[0010] Step 3, Install and repair the flange assembly: Assemble one or more flanges sequentially onto the outer side of the small end of the nozzle body, with the inner surface of the flange fitting against the outer surface of the nozzle body, and repair the outer surface of the flange assembly.

[0011] Step 4, Install and repair the reinforcement box assembly: Divide the reinforcement box into four groups along the circumference. First, install two groups that are set opposite each other and repair them. Then, install the other two groups of reinforcement boxes and repair them. The inner surface of the reinforcement box should fit the outer surface of the nozzle body. After installation, use adhesive to temporarily fix it.

[0012] Step 5: Use a drilling template to drill holes in the nozzle body, flange assembly, and reinforcing box assembly to obtain corresponding pin connection holes and fix them with pins. Then, place them in a chemical vapor deposition equipment for deposition. After deposition, grind off the pin heads to complete the overall assembly of the nozzle components.

[0013] Furthermore, in step 3, the fitting gap between the inner surface of the flange and the outer surface of the nozzle body is ≤0.05mm.

[0014] Furthermore, in step 1, the flange assembly includes multiple flanges, which are installed sequentially from bottom to top; the lower end face of the first flange is fitted with the base plate with a fitting gap of ≤0.05mm, and the fitting gap between adjacent arc-shaped structures is ≤0.05mm.

[0015] Further, in step 1, the reinforcing box includes an arc-shaped flat plate at the bottom, two side plates opposite to each other at both ends of the arc-shaped flat plate, and an arc-shaped back plate between the two side plates. The inner surface of the arc-shaped back plate is used to fit against the outer surface of the nozzle body. N reinforcing boxes are arranged sequentially, and the side plates of adjacent reinforcing boxes fit against each other with a fitting gap ≤ 0.05 mm. The fitting gap between the inner surface of the reinforcing box and the outer surface of the nozzle body is ≤ 0.05 mm.

[0016] In addition, a ceramic matrix composite nozzle component assembly fixture is provided to realize the above-mentioned ceramic matrix composite nozzle component assembly method, which is characterized by:

[0017] It includes a base plate, an outer pressure ring for the nozzle, at least three nozzle positioning blocks, one or more second limiting blocks, multiple first limiting blocks, multiple reinforcing box pressure plates, multiple second positioning blocks, and multiple first positioning blocks;

[0018] The base plate serves as the mounting base for the nozzle component, providing support during the assembly process; a positioning ring groove is provided in the middle of the base plate.

[0019] The outer pressure ring of the nozzle is coaxially disposed above the positioning ring groove and is detachably connected to the base plate through a connector; the inner side wall of the outer pressure ring of the nozzle is adapted to the outer surface of the middle part of the nozzle body, and is used to press and fix the nozzle body.

[0020] The nozzle positioning block is a positioning tool for the nozzle body. At least three nozzle positioning blocks are evenly distributed around the periphery of the positioning ring groove. The outer surface of the nozzle positioning block matches the inner surface corresponding to the small end of the nozzle body to ensure the relative position of the nozzle body on the base plate.

[0021] The second limiting block is located on the outside of the positioning ring groove and is used as the circumferential installation reference for the first arc-shaped structure of each flange. The second limiting block is detachably connected to the base plate.

[0022] The plurality of first limiting blocks are detachably connected to the base plate and located outside the positioning ring groove, serving as a reference for the installation of the reinforcing box;

[0023] The reinforcing box pressure plate consists of multiple arc-shaped plates, which are set around the positioning ring groove to press the assembled reinforcing box.

[0024] Both the second positioning block and the first positioning block are cylindrical or cylindrical structures, coaxially arranged with the positioning ring groove, and their outer surfaces respectively position the inner surfaces of the flange assembly and the reinforcing box assembly.

[0025] Furthermore, it also includes a drilling template, which is used to open corresponding pin connection holes on the nozzle body, flange assembly, and reinforcing box assembly;

[0026] It also includes an annular boss on the base plate that is coaxially arranged with the positioning ring groove and located on its outer periphery. The inner diameter of the annular boss is larger than the minimum inner diameter of the flange assembly, and the outer diameter is larger than the maximum outer diameter of the flange assembly. A limiting groove is radially arranged on the annular boss at the position where adjacent arc-shaped structures in each layer of flange meet. The second limiting block is arranged in the limiting groove. The nozzle positioning block is located between the positioning ring groove and the annular boss.

[0027] Furthermore, the connector is an extended screw;

[0028] The inner diameter of the annular boss is 0-1 mm larger than the minimum inner diameter of the flange assembly, and the outer diameter is 5-10 mm larger than the maximum outer diameter of the flange assembly.

[0029] The second limiting block is a longitudinally arranged flat plate with the lower end of the plate inserted into the limiting groove. The side of the plate is used as the circumferential installation reference for the first arc-shaped structure of the corresponding flange.

[0030] The bottom of the second positioning block and the first positioning block are provided with bosses that cooperate with the positioning ring groove for positioning.

[0031] Furthermore, the flange assembly includes a first flange, a second flange, and a third flange stacked sequentially from the base plate upwards, with each flange layer including three arc-shaped structures; the second limiting block includes a first layer of second limiting blocks, a second layer of second limiting blocks, and a third layer of second limiting blocks corresponding to the first flange, the second flange, and the third flange, respectively;

[0032] The multiple limiting grooves on the base plate are respectively set on the splicing surfaces of the three arc-shaped structures in each layer of flange, and the splicing surfaces corresponding to the first flange, the second flange and the third flange are respectively engraved with the numbers 1, 2 and 3. The inner side of the flat plate of the second limiting block of the second layer and the second limiting block of the third layer is provided with clearance grooves.

[0033] Furthermore, the first limiting block includes a horizontally arranged connecting plate and a longitudinal plate connected to the connecting plate. The connecting plate is connected to the base plate by bolts and pins. The longitudinal plate serves as the circumferential reference surface of the reinforcing box and limits the side plate of the reinforcing box.

[0034] The inner side of the reinforcing box pressure plate is provided with multiple grooves. The reinforcing box pressure plate is used to press and fix the arc-shaped flat plate at the bottom of the reinforcing box. The grooves are used to accommodate the corresponding side plates of the reinforcing box when the reinforcing box is pressed.

[0035] Furthermore, the plurality of first limiting blocks are divided into at least two groups, each group including two first limiting blocks, namely a left first limiting block and a right first limiting block, for limiting the reinforcing box in the middle; the longitudinal plate of the left first limiting block serves as the starting circumferential reference surface of the reinforcing box of the group.

[0036] The beneficial effects of this invention are:

[0037] 1. This invention proposes an assembly method and assembly tooling for ceramic matrix composite nozzle components, used to assemble the nozzle body, reinforcing box, and flange assembly. It solves the problem of high accuracy requirements for the installation angle and connection hole position of the flange assembly and reinforcing box during the assembly process of nozzle components from multiple perspectives, so as to avoid assembly errors in the ceramic matrix composite nozzle components during the assembly process that fail to meet the design requirements, thereby improving the assembly accuracy of ceramic matrix composite nozzle components.

[0038] 2. The ceramic matrix composite material of this invention is prepared by lamination of silicon carbide or carbon cloth. The flange assembly is layered and the reinforcing box assembly is assembled in groups. This method can solve the problems of excessive wall thickness adjustment of individual structures and carbon cloth breakage and delamination caused by tolerance accumulation in traditional assembly. By limiting the tolerance of each group of parts to a certain range, the requirements for the machining accuracy of individual parts are reduced. This solves the problem of excessively high machining accuracy requirements for individual structures in existing methods, which leads to high machining difficulty or high processing costs, and can significantly improve the production progress. At the same time, the tolerance of each flange layer and each group of reinforcing boxes is controlled separately by tooling limit. During assembly, the adjustment amount can be distributed among the parts, which is not easy to cause tolerance accumulation. This ensures that the relative position of the flange assembly, reinforcing box assembly and nozzle body is always within the required range, so as not to affect the overall assembly accuracy.

[0039] 3. The assembly fixture provided by the present invention has positioning and clamping fixing components, which can be used as a machining fixture for parts, effectively reducing production costs.

[0040] 4. The assembly fixture provided by the present invention adopts quick-release positioning and bolt fixing, which is easy to disassemble and interchangeable, and also realizes the generalization and lightweighting of the fixture. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall assembly structure of the nozzle component and assembly tooling in an embodiment of the present invention;

[0042] Figure 2 This is a schematic diagram of the assembly structure of the reinforcing box assembly in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the flange assembly in an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the reinforcing box pressure plate clamping structure in an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the nozzle positioning block in an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the drill template in an embodiment of the present invention;

[0047] Explanation of reference numerals in the attached figures:

[0048] 100- Nozzle body, 200- Reinforcing box assembly, 210- Reinforcing box, 300- Flange assembly, 400- Drill template, 010- Nozzle outer pressure ring, 020- Base plate, 021- Positioning ring groove, 022- Annular boss, 030- Extended screw, 040- First positioning block, 050, 052- Left first limiting block, 051, 053- Right first limiting block, 060- Second positioning block, 070- First layer second limiting block, 071- Second layer second limiting block, 072- Third layer second limiting block, 080- Reinforcing box pressure plate, 090- Nozzle positioning block. Detailed Implementation

[0049] This invention provides a ceramic matrix composite nozzle component assembly fixture for assembling nozzle components, such as... Figures 1 to 5 As shown, it includes a base plate 020, an extended screw 030, a nozzle outer pressure ring 010, multiple nozzle positioning blocks 090, multiple second limiting blocks, multiple first limiting blocks, multiple reinforcing box pressure plates 080, multiple second positioning blocks 060, and multiple first positioning blocks 040; the nozzle component assembly fixture is made of hard aluminum or carbon steel, and lifting rings are provided at the four corners of the base plate 020 for moving the base plate 020 or the assembly fixture.

[0050] The nozzle assembly includes a nozzle body 100, a flange assembly 300 disposed on the outer periphery of the small end of the nozzle body 100, and a reinforcing box assembly 200. The flange assembly 300 includes a first flange, a second flange, and a third flange stacked sequentially, each formed by splicing three arc-shaped structures. The reinforcing box assembly 200 consists of N reinforcing boxes 210, where N = 24. In other embodiments of the invention, N ≥ 8. Each reinforcing box 210 includes an arc-shaped flat plate at the bottom, two side plates disposed opposite each other at both ends of the arc-shaped flat plate, and an arc-shaped back plate disposed between the two side plates. The arc-shaped flat plate is fan-shaped. The N reinforcing boxes 210 are arranged sequentially to form a ring around the arc-shaped flat plate. The side plates of adjacent reinforcing boxes 210 are in contact with each other, and the inner surfaces of the N arc-shaped back plates form the inner surface of the reinforcing box assembly 200.

[0051] The base plate 020 serves as the mounting base for the nozzle component, providing support during assembly. It has multiple limiting grooves, bolt holes, and pin holes for connection with the extension screw 030, nozzle positioning block 090, second limiting block, first limiting block, reinforcing box pressure plate 080, second positioning block 060, and first positioning block 040. Figure 5As shown, a positioning ring groove 021 and an annular boss 022 coaxial with and located on the outer periphery of the positioning ring groove 021 are provided in the middle of the base plate 020. The inner diameter of the annular boss 022 is larger than the minimum inner diameter of the flange assembly 300, and the outer diameter is larger than the maximum outer diameter of the flange assembly 300. Preferably, the inner diameter of the annular boss 022 is 0-1 mm larger than the minimum inner diameter of the flange assembly 300, and the outer diameter is 5-10 mm larger than the maximum outer diameter of the flange assembly 300. A weight-reducing hole is provided in the center of the base plate 020.

[0052] The nozzle outer pressure ring 010 is connected to the base plate 020 via an extended screw 030 and is coaxially arranged with the positioning ring groove 021. The inner sidewall of the nozzle outer pressure ring 010 is adapted to the outer surface of the middle part of the nozzle body 100, serving as a position limiting fixture for the nozzle body 100. This fixture restricts the axial movement and rotation of the nozzle body 100 along the base plate 020 and clamps and fixes the nozzle body 100.

[0053] Multiple nozzle positioning blocks 090 serve as positioning fixtures for the nozzle body 100. At least three nozzle positioning blocks 090 are provided and are evenly distributed along the circumference on the base plate 020 between the positioning ring groove 021 and the annular boss 022. The outer surface of the nozzle positioning block 090 matches the inner surface corresponding to the small end of the nozzle body 100 to ensure the relative position of the nozzle body 100 on the base plate 020.

[0054] On the annular boss 022, a limiting groove is set radially at the position where adjacent arc-shaped structures in each layer of flange meet. During assembly, the flange assembly 300 is set with the annular boss 022. The second limiting block is a plate set longitudinally. The lower end of the plate is inserted into the limiting groove. The side of the plate is used as the circumferential installation reference for the first arc-shaped structure of the corresponding flange. In this embodiment, the first flange, the second flange, and the third flange are stacked sequentially upwards from the base plate 020. The second limiting block includes a first-layer second limiting block 070, a second-layer second limiting block 071, and a third-layer second limiting block 072, respectively. The limiting grooves corresponding to the splicing surfaces of the first flange, the second flange, and the third flange are respectively engraved with the numbers 1, 2, and 3 to distinguish the installation positions of different second limiting blocks. The inner side of the flat plate of the second-layer second limiting block 071 and the third-layer second limiting block 072 is provided with a clearance groove. The lower end of the first-layer second limiting block 070 is in contact with the base plate 020, and the lower ends of the second-layer second limiting block 071 and the third-layer second limiting block 072 are in contact with the upper end face of the flange below it. In other embodiments of the present invention, the number of flanges included in the flange assembly 300 and the number of arc-shaped structures in each layer of flanges can be adjusted as needed. The number of arc-shaped structures is at least two to facilitate subsequent installation. The number of second limiting blocks and their corresponding structures are adjusted according to the number of flanges.

[0055] Multiple first limiting blocks are located outside the positioning ring groove 021, divided into at least two groups. Each group includes two first limiting blocks, denoted as left first limiting blocks 50 and 52 and left first limiting blocks 51 and 53, respectively, used to limit the reinforcing box 210 in the middle. Each first limiting block includes a horizontally arranged connecting plate and a longitudinal plate arranged perpendicular to it. The connecting plate is connected to the base plate 020 by bolts and pins. The longitudinal plate serves as the installation reference for the reinforcing box 210. The setting angle of the longitudinal plate of the left first limiting blocks 50, 52 and left first limiting blocks 51, 53 is consistent with the setting angle of the side plate of the reinforcing box 210 that it is attached to. The installation position of the first limiting blocks is distinguished by the pin positioning holes provided on the base plate 020. The reinforcing box pressure plate 080 is a clamping tool for the reinforcing box 210. The reinforcing box pressure plate 080 is an arc-shaped plate with multiple grooves on its inner side, such as... Figure 4 As shown, after the reinforcing box 210 is installed in the required position, the reinforcing box pressure plate 080 is used to press and fix the arc-shaped flat plate at the bottom of the reinforcing box 210. The multiple grooves on the inner side of the reinforcing box pressure plate 080 are respectively set to correspond to the side plates of the corresponding reinforcing box 210, and are used to accommodate the side plates of the corresponding reinforcing box 210.

[0056] Drill template 400 is an auxiliary drilling tool for the pin connection holes on the nozzle component, used to ensure the accurate position of the pin connection holes on the nozzle component.

[0057] Both the second positioning block 060 and the first positioning block 040 are cylindrical or cylindrical structures, serving as sub-assembly fixtures for the flange assembly 300 and the reinforcing box 210, respectively. Their outer surfaces position the inner surfaces of the flange assembly 300 and the reinforcing box assembly 200, respectively. These inner surfaces are machined to eliminate the surface differences caused by separate machining of the flange assembly 300 and the reinforcing box assembly 200, ensuring that the machined inner surfaces fit snugly against the outer surface of the nozzle body 100. The second positioning block 060 and the first positioning block 040 are coaxially arranged with the positioning ring groove 021, and each has a boss at its bottom that mates with the positioning ring groove 021 for positioning.

[0058] Assembly tooling also includes, for example, Figure 6 The drill template 400 shown is used as an auxiliary drilling tool for the pin connection holes after each component is fixed in the required position, so as to ensure that the pin connection hole positions on the nozzle body 100, flange assembly 300 and reinforcing box assembly 200 are accurate.

[0059] This invention discloses an assembly method for a ceramic matrix composite nozzle component, employing the aforementioned assembly fixture, specifically including the following steps:

[0060] Step 1: As Figure 2As shown, the first positioning block 040 is installed onto the base plate 020 according to the pin holes and fixed by bolts. The inner surface of the reinforcing box assembly 200 is fitted with the outer surface of the first positioning block 040, with a fitting gap ≤0.1mm. Then, 502 glue is used to temporarily bond and fix the reinforcing box assembly 200. The first positioning block 040 is removed, and the inner surface of the reinforcing box assembly 200 is refitted to match the corresponding outer surface of the nozzle body 100, ensuring consistent surface contour of the inner surface of the reinforcing box assembly 200 to eliminate overall surface differences caused by different processing states of individual parts. The side plates of adjacent reinforcing boxes 210 are fitted together, with a fitting gap ≤0.05mm; the fitting gap between the inner surface of the reinforcing box 210 and the outer surface of the nozzle body 100 is ≤0.05mm.

[0061] like Figure 3 As shown, install the second positioning block 060 onto the base plate 020 according to the pin hole positions, and fix it with bolts. Fit the inner surface of the flange assembly 300 with the outer surface of the second positioning block 060, with a fitting gap ≤0.1mm. Then, temporarily bond and fix the flange assembly 300 with 502 glue, remove the second positioning block 060, and perform overall fitting of the inner surface of the flange assembly 300 to match the corresponding outer surface of the nozzle body 100, ensuring consistent surface profile of the inner surface of the flange assembly 300. The lower end face of the first flange is fitted with the base plate 020, with a fitting gap ≤0.05mm, and the fitting gap between adjacent arc-shaped structures is ≤0.05mm.

[0062] Step 2: As Figure 5 As shown, install the nozzle positioning block 090, and then install the nozzle body 100, so that the inner shape of the small end of the nozzle body 100 fits with the outer shape of the nozzle positioning block 090, with a fitting gap ≤0.05mm.

[0063] Step 3: As Figure 1 As shown, the nozzle outer pressure ring 010 is set on the outside of the nozzle body 100. The nozzle outer pressure ring 010 is connected to the base plate 020 by the extension screw 030. The nozzle outer pressure ring 010 is used to press the nozzle body 100 and restrict the movement and rotation of the nozzle body 100 along the axis on the base plate 020.

[0064] Step 4: As Figure 3As shown, firstly, the first flange of the first layer is repaired. The second limiting block 070 of the first layer is inserted into one of the limiting grooves engraved with the number 1. Taking the side of the second limiting block 070 of the first layer as the starting circumferential reference surface of the arc structure of the first flange, the first arc structure is set. The gap between its left side and the side of the second limiting block 070 of the first layer is ≤0.05mm. The gap between its inner surface and the outer surface of the nozzle body 100 is ≤0.05mm. The gap between its lower end surface and the base plate 020 is ≤0.05mm. Then, its right side is repaired so that it is coplanar with the right groove surface of the limiting groove also engraved with the number 1. Using the right side of the first arc-shaped structure of the first layer as a circumferential reference, the second arc-shaped structure of the first layer is then fitted, ensuring that the left side of the second arc-shaped structure aligns with the right side of the first arc-shaped structure, with a mating gap ≤ 0.05mm. The inner surface of the second arc-shaped structure should also have a mating gap ≤ 0.05mm with the outer surface of the nozzle body 100, and the lower end face should have a mating gap ≤ 0.05mm with the base plate 020. It should then be coplanar with the right groove surface of the next limiting groove engraved with the number 1. Finally, the second limiting block 070 of the first layer is removed, and the third arc-shaped structure is fitted between the first and second arc-shaped structures, ensuring that the mating gap between it and the first and second arc-shaped structures is ≤ 0.05mm, thus completing the assembly of the first flange. After completion, using the upper surface of the first flange as the bottom reference, insert the second limiting block 071 of the second layer into the limiting groove engraved with the number 2 as the starting circumferential reference to install the second flange. The assembly method is the same as the first layer. Then, install the third flange in sequence, using the second limiting block 072 of the third layer as the starting circumferential reference. After installation, the flange assembly 300 is complete. After the flange assembly 300 is installed, it is temporarily fixed with 502 glue.

[0065] Step 5: Assemble the reinforcing box 210 using a group assembly method. For example... Figure 2 As shown, this embodiment has a total of 24 reinforcing boxes 210, which are divided into four groups of six reinforcing boxes 210 each. The reinforcing boxes 210 are repaired and fitted in groups to ensure that the repair work is evenly distributed among the parts in the group. Two sets of first limit blocks are installed according to different pin positioning holes, and the two sets of first limit blocks correspond to the two sets of reinforcing boxes 210 that are set opposite to each other.

[0066] First, install the six reinforcing boxes 210 between each group of first limiting blocks. Using the longitudinal flat plates of the left first limiting blocks 50 and 52 as the starting circumferential reference surface for that group of reinforcing boxes 210, and the upper end face of the third flange as the bottom reference surface, install the reinforcing boxes 210 sequentially. The fitting gap between two adjacent reinforcing boxes 210 should be ≤0.05mm. The inner surface of the reinforcing box 210 should fit against the outer surface of the nozzle body 100, with a fitting gap ≤0.05mm. Finally, ensure that the outer side panels of the side plates of the reinforcing boxes 210 located at both ends fit against the reference surfaces of their corresponding left first limiting blocks 50 and 52 and left first limiting blocks 51 and 53, with a fitting gap ≤0.1mm. Then, use the reinforcing box pressure plate 080 to press and fix the reinforcing boxes 210, ensuring that the reinforcing boxes 210 installed in the required position no longer move.

[0067] Next, remove the first limiting block, and install and repair the remaining reinforcing boxes 210 in sequence, using the side of the relatively installed reinforcing box 210 as the circumferential reference. After repair, use the reinforcing box pressure plate 080 to press and fix it, and then use 502 for temporary bonding and fixing, and remove the reinforcing box pressure plate 080.

[0068] Step 6: Use the drill template 400 to drill holes between each component to obtain corresponding pin connection holes and use pins to rivet and fix them. Then, put the riveted reinforcing box component 200, flange component 300 and nozzle body 100 into the chemical vapor deposition equipment for one batch deposition. Then grind and flatten the pin heads to complete the overall assembly of the ceramic matrix composite nozzle component.

Claims

1. A method of assembling a ceramic matrix composite nozzle component, characterized by, Includes the following steps: Step 1: Fix the flange assembly (300) on a base plate (020) and process its inner surface to make it consistent with the outer surface of the nozzle body (100) at the corresponding position; the flange assembly (300) includes one or more flanges, each flange is formed by splicing at least two arc-shaped structures and is temporarily fixed by adhesive bonding. After processing, the flange assembly (300) is removed. A reinforcing box assembly (200) is fixed on the base plate (020), and its inner surface is processed to make it consistent with the outer surface of the corresponding position of the nozzle body (100). The reinforcing box assembly (200) is formed by N reinforcing boxes (210) arranged in sequence to form a ring structure, where N≥8. The side walls of two adjacent reinforcing boxes (210) are attached to each other and temporarily fixed by adhesive bonding. After processing, the reinforcing box assembly (200) is removed. Step 2: Install the nozzle body (100) on the base plate (020), with the small end of the nozzle body (100) facing the base plate (020) and fitting against it; Step 3, Install and repair the flange assembly (300): Assemble one or more flanges sequentially onto the outer side of the small end of the nozzle body (100), with its inner surface fitting against the outer surface of the nozzle body (100), and repair the outer surface of the flange assembly (300). Step 4, Install and repair the reinforcing box assembly (200): Divide the reinforcing box (210) into four groups along the circumference. First, install two groups that are set opposite each other and repair them. Then, install the other two groups of reinforcing boxes (210) and repair them. The inner surface of the reinforcing box (210) fits against the outer surface of the nozzle body (100). After installation, it is temporarily fixed by adhesive bonding. Step 5: Using a drill template (400), holes are drilled in the nozzle body (100), flange assembly (300), and reinforcing box assembly (200) to obtain corresponding pin connection holes and fix them with pins. Then, they are placed in a chemical vapor deposition equipment for deposition. After deposition, the pin heads are ground off to complete the overall assembly of the nozzle components.

2. The assembly method for ceramic matrix composite nozzle components according to claim 1, characterized in that: In step 3, the fitting gap between the inner surface of the flange and the outer surface of the nozzle body (100) is ≤0.05 mm.

3. The assembly method for ceramic matrix composite nozzle components according to claim 1 or 2, characterized in that: In step 1, the flange assembly (300) includes multiple flanges, which are installed sequentially from bottom to top; the lower end face of the first flange is fitted with the base plate (020) with a fitting gap of ≤0.05 mm, and the fitting gap between adjacent arc structures is ≤0.05 mm.

4. The assembly method for ceramic matrix composite nozzle components according to claim 1 or 2, characterized in that: In step 1, the reinforcing box (210) includes an arc-shaped plate at the bottom, two side plates at opposite ends of the arc-shaped plate, and an arc-shaped back plate between the two side plates. The inner side of the arc-shaped back plate is used to fit against the outer surface of the nozzle body (100). N reinforcing boxes (210) are arranged in sequence, and the side plates of adjacent reinforcing boxes (210) fit against each other with a fitting gap ≤0.05 mm. The fitting gap between the inner surface of the reinforcing box (210) and the outer surface of the nozzle body (100) is ≤0.05 mm.

5. A ceramic matrix composite nozzle component assembly fixture, used to implement the ceramic matrix composite nozzle component assembly method according to any one of claims 1-4, characterized in that: It includes a base plate (020), a nozzle outer pressure ring (010), at least three nozzle positioning blocks (090), one or more second limiting blocks, multiple first limiting blocks, multiple reinforcing box pressure plates (080), a second positioning block (060), and a first positioning block (040); The base plate (020) serves as the mounting base for the nozzle component, providing support for the assembly process; a positioning annular groove (021) is provided in the middle of the base plate (020); The nozzle outer pressure ring (010) is coaxially disposed above the positioning ring groove (021) and is detachably connected to the base plate (020) through a connector; the inner side wall of the nozzle outer pressure ring (010) is adapted to the outer surface of the nozzle body (100) in the middle, and is used to press and fix the nozzle body (100); The nozzle positioning block (090) is a positioning fixture for the nozzle body (100). At least three nozzle positioning blocks (090) are evenly distributed around the periphery of the positioning ring groove (021). The outer surface of the nozzle positioning block (090) matches the inner surface corresponding to the small end of the nozzle body (100) to ensure the relative position of the nozzle body (100) on the base plate (020). The second limiting block is set on the outside of the positioning ring groove (021) and is used as the circumferential installation reference for the first arc structure of each flange. The second limiting block is detachably connected to the base plate (020). The plurality of first limiting blocks are detachably connected to the base plate (020) and located outside the positioning ring groove (021), serving as a reference for the installation of the reinforcing box (210); The reinforcing box pressure plate (080) consists of multiple arc-shaped plates, which are set around the positioning ring groove (021) to press the assembled reinforcing box (210). The second positioning block (060) and the first positioning block (040) are both cylindrical or cylindrical structures, and are coaxially arranged with the positioning ring groove (021). Their outer surfaces are used to position the inner surfaces of the flange assembly (300) and the reinforcing box assembly (200), respectively.

6. The assembly tooling for the ceramic matrix composite nozzle component according to claim 5, characterized in that: It also includes a drilling template (400), which is used to open corresponding pin connection holes on the nozzle body (100), flange assembly (300), and reinforcing box assembly (200); It also includes an annular boss (022) on the base plate (020) that is coaxially arranged with the positioning ring groove (021) and located on its outer periphery. The inner diameter of the annular boss (022) is larger than the minimum inner diameter of the flange assembly (300), and the outer diameter is larger than the maximum outer diameter of the flange assembly (300). A limiting groove is provided radially on the annular boss (022) corresponding to the position where adjacent arc-shaped structures in each layer of flange meet. The second limiting block is arranged in the limiting groove. The nozzle positioning block (090) is located between the positioning ring groove (021) and the annular boss (022).

7. The assembly tooling for the ceramic matrix composite nozzle component according to claim 6, characterized in that: The connector is an extended screw (030); The inner diameter of the annular boss (022) is 0-1 mm larger than the minimum inner diameter of the flange assembly (300), and the outer diameter is 5-10 mm larger than the maximum outer diameter of the flange assembly (300). The second limiting block is a longitudinally arranged flat plate with the lower end of the plate inserted into the limiting groove. The side of the plate is used as the circumferential installation reference for the first arc-shaped structure of the corresponding flange. The bottom of the second positioning block (060) and the first positioning block (040) are provided with bosses that cooperate with the positioning ring groove (021) for positioning.

8. The assembly tooling for ceramic matrix composite nozzle components according to claim 6 or 7, characterized in that: The flange assembly (300) includes a first flange, a second flange, and a third flange stacked sequentially from the base plate (020), with each flange layer including three arc-shaped structures; the second limiting block includes a first-layer second limiting block (070), a second-layer second limiting block (071), and a third-layer second limiting block (072) corresponding to the first flange, the second flange, and the third flange, respectively. The multiple limiting grooves on the base plate (020) are respectively set on the splicing surfaces of the three arc-shaped structures in each layer of flange, and the splicing surfaces corresponding to the first flange, the second flange and the third flange are respectively engraved with the numbers 1, 2 and 3. The inner side of the flat plate of the second limiting block (071) of the second layer and the second limiting block (072) of the third layer is provided with a clearance groove.

9. The assembly tooling for the ceramic matrix composite nozzle component according to claim 8, characterized in that: The first limiting block includes a horizontally arranged connecting plate and a longitudinal plate connected to the connecting plate. The connecting plate is connected to the base plate (020) by bolts and pins. The longitudinal plate serves as the circumferential reference surface of the reinforcing box (210) and limits the side plate of the reinforcing box (210). The inner side of the reinforcing box pressure plate (080) is provided with multiple grooves. The reinforcing box pressure plate (080) is used to press and fix the arc-shaped flat plate at the bottom of the reinforcing box (210). The grooves are used to accommodate the corresponding side plates of the reinforcing box (210) when the reinforcing box (210) is pressed.

10. The assembly tooling for the ceramic matrix composite nozzle component according to claim 9, characterized in that: The plurality of first limiting blocks are divided into at least two groups, each group including two first limiting blocks, namely the left first limiting block (50, 52) and the right first limiting block (51, 53), which are used to limit the reinforcing box (210) in the middle; the longitudinal plate of the left first limiting block (50, 52) serves as the starting circumferential reference surface of the reinforcing box (210) in this group.

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