An assembly tool and processing method for a ceramic matrix composite seal piece of an aero-engine

Abstract

This invention relates to the processing of ceramic-based composite sealing sheets, specifically to an assembly fixture and processing method for ceramic-based composite sealing sheets for aero-engines. To address the shortcomings of existing technologies where sealing sheets can only be processed using a split-assembly method, increasing the manufacturing difficulty of the sealing adjustment sheet, and further complicating the clamping and positioning difficulties during processing due to the irregular structure of the ceramic sealing adjustment sheet, the assembly fixture includes a base, a V-block, multiple positioning blocks, multiple clamping blocks, a lug positioning shaft, a positioning bushing, a lug positioning seat, and a suspension positioning assembly. The end shape of the base corresponds to the shape of the base plate at one end; the V-face of the V-block corresponds to the other end face of the base plate and is detachably connected to the base; the lug positioning seat, lug positioning shaft, and positioning bushing are used to position the lug assembly. The processing method employs the assembly fixture for assembly, while simultaneously performing fitting and processing on the ceramic-based composite sealing sheet.

Description

Technical Field

[0001] This invention relates to the processing of ceramic-based composite sealing sheets, specifically to an assembly tooling and processing method for ceramic-based composite sealing sheets for aero-engines. Background Technology

[0002] The sealing adjustment plate is a key component of the aero-engine tail nozzle system. In the tail nozzle system, the tail nozzle outlet is adjusted to different diameters through a control mechanism, thereby achieving thrust adjustment within a certain range. Due to the high temperature, high pressure, large thermal strain, and strong corrosiveness of the tail nozzle system's operating environment, the requirements for the materials used in the manufacturing of parts are high. Currently, the hot-end components of in-service aero-engines mainly use high-temperature alloy materials. However, with the development of aero-engine technology, their operating temperatures reach as high as 1800-2000℃, and high-temperature alloys are increasingly unable to meet the operating requirements. Continuously toughened ceramic matrix composites, as a new type of high-temperature resistant, strong, and lightweight material, have emerged as a solution. Ceramic matrix composite materials are strategic materials and have become the most ideal research material for the hot-end components of sixth-generation aero-engines. However, due to the high processing difficulty of ceramic matrix composite materials and the high assembly precision requirements of the sealing plates, and because of the characteristics of ceramic matrix composite materials and the structural form of the sealing plates, the sealing plates cannot be manufactured as a whole and can only be processed by separate assembly, which increases the manufacturing difficulty of the sealing plates. In addition, the irregular shape of the ceramic sealing plate structure further makes clamping and positioning difficult during processing. Therefore, there is an urgent need to provide assembly tooling and processing methods for ceramic matrix composite sealing adjustment plates, which will help to meet the precision requirements of the composite sealing plate processing process. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies where sealing sheets can only be processed by separate assembly, which increases the manufacturing difficulty of sealing adjustment sheets. Furthermore, the irregular structure and surface of ceramic sealing adjustment sheets further complicate the clamping and positioning during processing. Therefore, this invention provides an assembly tooling and processing method for ceramic-based composite sealing sheets for aero-engines.

[0004] To achieve the above objectives, the technical solution provided by this invention is as follows:

[0005] An assembly fixture for a ceramic-based composite sealing sheet for an aero-engine is provided for processing the ceramic-based composite sealing sheet. The sealing sheet includes an ear assembly, a base plate, and a suspension assembly. The ear assembly is located at one end of the base plate, its bottom fitting against the base plate, and has pre-drilled holes for connecting external components. The suspension assembly is located in the middle of the base plate and has suspension holes. The other end face of the base plate has an arc-shaped profile. Its key feature is that it includes a base, a V-block, multiple positioning blocks, multiple clamping blocks, an ear positioning shaft, a positioning bushing, an ear positioning seat, and a suspension positioning assembly. The base is used to mount the base plate, and its end shape corresponding to one end of the base plate matches the shape of the base plate. The V-block's V-shape... The profile is set on the other end face corresponding to the base plate and is detachably connected to the base; multiple positioning blocks are respectively set on the base on both sides of the base plate, and cooperate with the V-block to limit the base plate; multiple clamping blocks are respectively set on both sides of the base plate to clamp the base plate after positioning; the ear plate positioning seat is set on one end of the base and is detachably connected to the base, and the ear plate positioning seat is provided with a first through hole corresponding to the pre-made hole of the ear plate assembly. The ear plate positioning shaft is set through the first through hole and the pre-made hole, and the positioning bushing is sleeved on the ear plate positioning shaft between the first through hole and the pre-made hole; one end of the suspension positioning assembly is detachably connected to the base, and the other end is used to position the suspension assembly.

[0006] Furthermore, the suspension positioning assembly includes a suspension positioning seat and a suspension positioning shaft. The suspension positioning assembly is detachably connected to the base via the suspension positioning seat. The suspension positioning seat is provided with an extension, and the extension is provided with a second through hole coaxial with the suspension hole on the suspension assembly. The suspension positioning shaft passes through the second through hole and the suspension hole to position the suspension assembly.

[0007] Furthermore, the number of clamping blocks is at least four, and the number of positioning blocks is at least two;

[0008] At least two first limiting grooves are provided on the base corresponding to the positions on both sides of the base plate, and the positioning block is disposed in the first limiting groove.

[0009] Furthermore, four clamping blocks are provided on the base, with two on each side of the base plate, and the distance between two clamping blocks on the same side of the base plate is 1 / 2 to 2 / 3 of the base plate length.

[0010] Furthermore, the distance between the V-shaped block and the positioning block along the length of the base plate is greater than or equal to 2 / 3 of the total length of the base plate;

[0011] The base is provided with a matching second limiting groove at the position of the V-block. The V-block is set in the second limiting groove to adjust the movement along the length direction caused by the total length tolerance of the base plate.

[0012] Furthermore, the base and the ear positioning seat are pre-tightened with hexagonal head screws and a cylindrical pin is provided for positioning to ensure that the base and the ear positioning seat do not undergo relative displacement.

[0013] The suspension positioning assembly is pre-tightened onto the base using hexagonal head screws and positioned using cylindrical pins.

[0014] Furthermore, it also includes a notch at one corner of the base near the ear assembly and multiple grooves at the bottom of the base; the notch prevents interference with other structures during the processing of the ear assembly; the multiple grooves are used to reduce the contact area of ​​the base to ensure the accuracy of the bottom plane of the base.

[0015] Meanwhile, the present invention also provides a method for processing a ceramic-based composite sealing sheet for aero-engines, using the aforementioned assembly tooling for the aero-engine ceramic-based composite sealing sheet, characterized by the following steps:

[0016] Step 1: Install the base plate on the base of the assembly fixture, use V-blocks and positioning blocks to position it, and then fix the base plate with clamping blocks.

[0017] Step 2: Assemble the ear piece assembly onto the base plate, and modify the bottom of the ear piece assembly so that the bottom of the ear piece assembly fits the upper surface of the base. Insert the ear piece positioning shaft into the pre-made hole and the first through hole of the ear piece assembly, and at the same time set the positioning bushing, with the two ends of the positioning bushing fitting against the outer periphery of the pre-made hole and the outer periphery of the first through hole, respectively.

[0018] Step 3: Rivet the ear plate assembly to the base plate parts with ceramic composite rivets, and remove the ear plate positioning shaft, positioning bushing, and ear plate positioning seat;

[0019] Step 4: Finish machine the ear plate assembly to ensure the center symmetry between the ear plate assembly and the base plate; machine the clearance grooves of the ear plate assembly and the base plate to ensure the consistency and position of the clearance grooves; finish machine the pre-drilled mounting holes on the ear plate assembly to the required size; machine the suspension assembly mounting holes on the base plate.

[0020] Step 5: Remove the base plate and ear assembly from the assembly fixture, and then deposit them through a vapor deposition process to achieve the required density.

[0021] Step 6: Grind the surface slag of the base plate and ear plate assembly, remove burrs, and finely ream the holes;

[0022] Step 7: Assemble the base plate and ear assembly onto the assembly fixture, then install the suspension assembly and position the suspension assembly using the suspension positioning assembly.

[0023] Step 8: Rivet the base plate to the suspension assembly to complete the sealing component processing.

[0024] Furthermore, in step 1, the V-block and positioning block are used for positioning, specifically as follows:

[0025] Make the other end of the base plate of the ceramic matrix composite sealing sheet fit with the V-shaped surface of the V-block, then insert two positioning blocks into the base, leaving a fixed gap between the positioning blocks and the base plate, and then insert two standard gauge blocks of equal thickness into the fixed gap to detect and determine the correct position of the base plate fixture.

[0026] Step 7 specifically involves: assembling the base plate and ear assembly onto the assembly fixture, and positioning them using positioning blocks, V-blocks, ear positioning shafts, positioning bushings, and ear positioning seats, wherein the length of the positioning bushing is greater than that of the positioning bushing in step 2; installing the suspension positioning seat at the corresponding position on the base, and then installing the suspension assembly, ensuring that the bottom surface of the suspension assembly is in contact with the upper surface of the base plate; passing the suspension positioning shaft through the holes in the suspension assembly and the holes on the suspension assembly positioning seat, ensuring that the mounting holes on the suspension assembly correspond one-to-one with the mounting holes of the suspension assembly on the base plate.

[0027] Furthermore, in step 1, the fixed gap is 1 mm;

[0028] In step 2, the gap between the bottom of the ear assembly and the base plate is ≤0.1mm.

[0029] The beneficial effects of this invention are:

[0030] 1. The assembly fixture of the present invention is designed for the unique ceramic-based composite sealing sheet structure. To ensure the assembly accuracy of the ceramic-based composite sealing sheet, the assembly fixture is equipped with V-blocks, positioning blocks, and clamping blocks to position the base plate of the ceramic-based composite sealing sheet. The ear piece assembly is positioned by the ear piece positioning shaft, positioning bushing, and ear piece positioning seat. This reduces the difficulty of clamping and alignment during processing, and enables the positioning and clamping of the ceramic-based composite sealing sheet in multiple assembly, processing, and inspection stages. This ensures the consistency of the positioning benchmark in multiple stages, further reduces repeated positioning errors, and effectively guarantees the assembly and processing accuracy of the ceramic-based composite sealing sheet.

[0031] 2. The present invention positions the ear piece by setting an ear piece positioning shaft and a positioning bushing, so that the ear piece assembly is positioned flexibly and accurately. After precision machining, even if there are slight changes in the size of the ear piece assembly, it is only necessary to replace the positioning bushing of different sizes to achieve precise positioning of the ear piece assembly.

[0032] 3. This invention solves the problems of small processing allowance and high difficulty in processing ceramic-based composite sealing sheets. It provides suitable assembly tooling and methods for processing irregular surfaces, further saving the cost of expensive ceramic composite materials.

[0033] 4. By setting a notch on the base, this invention solves the problem of limited processing space and interference of processing tools in ceramic matrix composites.

[0034] 5. The processing method of the present invention allows for reprocessing after assembly while maintaining the unchanged positioning relationship, effectively ensuring the positional accuracy during processing.

[0035] 6. This invention provides an assembly tooling that is compact in structure, highly efficient in assembly, and simple to manufacture. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of the ceramic-based composite sealing sheet processed in an embodiment of the present invention;

[0037] Figure 2 This is an exploded view of the ceramic-based composite sealing sheet processed in the embodiments of the present invention;

[0038] Figure 3 This is a schematic diagram of the working state of an embodiment of the assembly tooling of the present invention;

[0039] Figure 4 for Figure 3 Exploded view;

[0040] Explanation of reference numerals in the attached figures:

[0041] 11-Ear assembly, 111-Left ear, 112-Adjusting plate, 113-Right ear, 114-Transverse connecting block, 115-Pre-drilled hole, 12-Base plate, 121-Suspension assembly mounting hole, 13-Suspension assembly, 14-Clearing groove; 21-Base, 211-Notch, 212-Groove, 22-V-block, 221-Second limiting groove, 23-Positioning block, 231-First limiting groove, 24-Clamping block, 25-Ear positioning shaft, 26-Positioning bushing, 27-Ear positioning seat, 28-Suspension positioning seat, 29-Suspension positioning shaft. Detailed Implementation

[0042] like Figure 1 and 2As shown, the ceramic-based composite sealing sheet mainly includes an ear assembly 11, a base plate 12, and a suspension assembly 13. The ear assembly 11 is located at one end of the base plate 12. The ear assembly 11 includes a left ear 111, an adjusting plate 112, and a right ear 113, which are riveted together in sequence with ceramic composite pins, and two transverse connecting blocks 114 respectively set at the bottom of the left ear 111 and the right ear 113. The transverse connecting blocks 114 are used to connect with the base plate 12. Through holes are correspondingly provided on the left ear 111, the adjusting plate 112, and the right ear 113 to form pre-made holes 115 in the ear assembly 11 for connecting other external components. The suspension assembly 13 is located in the middle of the base plate 12 and includes a bottom connecting plate and two longitudinal connecting plates vertically set on the bottom connecting plate. The two longitudinal connecting plates are fixedly connected to the base plate 12. The suspension holes are coaxially opened on the two longitudinal connecting plates, and the central axis of the suspension holes is set along the length direction of the base plate 12. The other end face of the base plate 12 has an arc shape. The lug assembly 11, the suspension assembly 13 and the base plate 12 have symmetry and positional accuracy requirements. At the same time, there are also positional accuracy requirements between the lug assembly 11 and the suspension assembly 13. The two transverse connecting blocks 114 of the lug assembly 11 and the corresponding positions at the end of the base plate 12 are provided with clearance grooves 14. The two clearance grooves 14 on the lug assembly 11 and the two clearance grooves 14 on the base plate 12 should be consistent. The X direction is defined along the length direction of the base plate 12 and the Y direction is defined along the width direction of the base plate 12. The two clearance grooves 14 have symmetry accuracy requirements relative to the center line of the X direction of the base plate 12.

[0043] The ear assembly 11 and the base plate 12 are made of SiC / SiCN ceramic matrix composite material. The transverse connecting block 114 of the ear assembly 11 and the base plate 12 are connected by ceramic composite pin riveting. The suspension assembly 13 is made of metal, and the base plate 12 and the suspension assembly 13 are connected by metal pin riveting.

[0044] like Figure 3 and Figure 4 As shown, the assembly fixture mainly includes a base 21, a V-block 22, two positioning blocks 23, four clamping blocks 24, an ear plate positioning shaft 25, a positioning bushing 26, an ear plate positioning seat 27, a suspension assembly 13 positioning seat, and a suspension positioning shaft 29.

[0045] Although the number of components in the ceramic matrix composite sealing sheet is small, its thin size, limited positioning space, and high relative position requirements necessitate that the assembly fixture, while considering workpiece positioning, also structurally address the interference issues related to the positional space and placement of the ceramic matrix composite sealing sheet during assembly. Furthermore, based on the aforementioned precision requirements of the ceramic matrix composite sealing sheet, the assembly fixture first utilizes the large flat surface of the base 21 in conjunction with the V-block 22 and positioning block 23 to achieve accurate positioning of the base plate 12. The end shape of the base 21 corresponding to one end of the base plate 12 corresponds to the shape of the base plate 12 and is provided with a clearance groove to facilitate the machining of the connecting block 114 and the clearance groove 14 on the end of the base plate 12. The V-block 22 serves as the Y-axis positioning reference and X-axis auxiliary positioning reference for the base plate 12 of the ceramic matrix composite sealing sheet. Here, the centering function of the V-block 22 is used to ensure the positional accuracy of the centerline of the base plate 12. Since the length of the base plate 12 is... When the base plate 12 is large, the positioning error will increase with the increase of the length when only the V-block 22 is used for positioning. Therefore, the base 21 is provided with first limiting grooves 231 on both sides of the base plate 12. Two positioning blocks 23 are respectively set in the corresponding first limiting grooves 231. The positioning blocks 23 are used to ensure the center symmetry requirement of the base plate 12, and at the same time serve as the X-direction positioning reference and Y-direction auxiliary positioning reference of the base plate 12. They cooperate with the V-block 22 to ensure the accurate positioning of the base plate 12 in the X and Y directions, and further ensure the positioning accuracy requirement of the base plate 12. The distance in the X direction between the V-block 22 and the positioning block 23 should be greater than or equal to 2 / 3 of the total length of the base plate 12. After positioning, the base plate 12 is pressed by multiple clamping blocks 24 set on both sides of it. In other embodiments of the present invention, the number of clamping blocks 24 can be adjusted as needed, and at least four are required to ensure that the position of the base plate 12 does not shift. The base 21 is provided with a matching second limiting groove 221 corresponding to the position of the V-block 22. The V-block 22 is set in the second limiting groove 221 to adjust the slight movement of the base plate 12 in the X direction caused by the total length tolerance.

[0046] The ear plate positioning seat 27 is located at one end of the base 21 and is detachably connected to the base 21 by screws. Its side is provided with a first through hole coaxial with the pre-drilled hole 115 of the ear plate assembly 11. During assembly, the ear plate positioning shaft 25 passes through the first through hole and the pre-drilled hole 115 of the ear plate assembly 11. The positioning bushing 26 is sleeved on the ear plate positioning shaft 25 and is located between the first through hole and the pre-drilled hole 115 of the ear plate assembly 11. The outer diameter of the bushing is larger than the diameter of the pre-drilled hole 115. Its two ends are respectively attached to the outer periphery of the pre-drilled hole 115 and the outer periphery of the first through hole. This allows the assembly fixture to determine the X and Z direction position accuracy of the ear plate assembly 11 by cooperating with the pre-drilled hole 115 on the ear plate assembly 11 through the ear plate positioning shaft 25. Then, the Y direction position accuracy of the ear plate assembly 11 is determined by the planar contact between the positioning bushing 26 and the ear plate assembly 11 and the ear plate positioning seat 27.

[0047] The suspension positioning seat 28 is detachably connected to the base 21 by screws. The suspension positioning seat 28 is provided with an extension, and the extension is provided with a second through hole coaxial with the suspension hole on the suspension assembly 13. The suspension positioning shaft 29 passes through the suspension hole and the second through hole. By cooperating with the suspension hole, the suspension positioning shaft 29 achieves accurate positioning of the suspension assembly 13 in the Y and Z directions. The suspension positioning seat 28 achieves accurate positioning of the suspension assembly 13 in the X direction through planar contact with the suspension assembly 13.

[0048] The base 21 has a notch 211 at one corner corresponding to one end of the ear assembly 11 to prevent interference with the tool chuck during processing and to facilitate the machining of the pre-drilled hole 115 on the ear assembly 11 on the CNC milling machine; the base 21 has multiple grooves 212 at the bottom to reduce the contact area at the bottom and ensure the plane accuracy of the base 21 when it is placed.

[0049] In this embodiment, the base 21 and the ear positioning seat 27 are pre-tightened with hexagonal head screws. After checking and adjusting the position of the first through hole on the ear positioning seat 27 to meet the design requirements, the hexagonal head screws are tightened. Then, the positioning pin holes of the base 21 and the ear positioning seat 27 are machined simultaneously, and cylindrical pins are installed for positioning to ensure that the base 21 and the ear positioning seat 27 no longer have relative displacement. The connection method between the suspension positioning seat 28 and the base 21 is the same as the connection method between the ear positioning seat 27 and the base 21. The V-block 22 is connected to the base 21 by screws and is limited by a cylindrical pin set at the lowest point of the V-shaped surface. The clamping block 24 is provided with an elongated hole, and is fixed to the base 21 by a screw and nut passing through the elongated hole. Rotating the screw can adjust its height relative to the base 21, and at the same time, the position of the clamping block 24 can be adjusted along the elongated hole to facilitate the installation of the base plate 12.

[0050] The detailed assembly steps for assembling ceramic-based composite sealing sheets using the assembly fixture designed in this invention are as follows:

[0051] Step 1: Repairing parts

[0052] according to Figure 2 and Figure 3 As shown, check whether the ceramic-based composite sealing sheet and assembly tooling are complete, and check and repair the surface of the ear assembly 11, base plate 12 and suspension assembly 13 for problems such as scum and burrs.

[0053] Step 2: Assemble base plate 12

[0054] according to Figure 3The bottom surface of the base plate 12 is attached to the upper surface of the base 21, and the other end face of the base plate 12 is attached to the V-shaped surface of the V-block 22. Then, two positioning blocks 23 are inserted into the first limiting groove 231 of the base 21. A fixed gap is left between the positioning blocks 23 on both sides and the base plate 12. The fixed gap is checked by using a gauge of equal thickness or inserting a standard gauge block of equal thickness into the fixed gap. This is used to adjust the slight movement of different parts in the X direction caused by the total length tolerance of the base plate 12, and to determine the correct position of the base plate 12. After determining the position, the base plate 12 is fastened to the tooling with four clamping blocks 24.

[0055] In this embodiment, the fixed gap is 1mm, and two clamping blocks 24 are provided on each side of the base plate 12. The distance between the two clamping blocks 24 located on the same side of the base plate 12 is 1 / 2-2 / 3 of the length of the base plate 12.

[0056] Step 3: Assemble the ear plate assembly 11

[0057] Step 3.1

[0058] according to Figure 3 Repair the transverse connecting block 114 of the ear piece assembly 11 so that it fully fits the contact surface of the base plate 12 with a gap of no more than 0.1mm. Insert the ear piece positioning shaft 25 into the φ5mm hole on the ear piece assembly 11. At the same time, set the positioning bushing 26 to ensure that the outer periphery of the pre-made hole 115 fits the positioning bushing 26.

[0059] In this embodiment, the contact surfaces between the two transverse connecting blocks 114 and the base plate 12 are both arc surfaces with a radius of R;

[0060] Step 3.2

[0061] After the ear piece assembly 11 is in place, the symmetry accuracy of the ear piece assembly 11 from the center of the base plate 12 is checked and adjusted to be less than 0.3mm;

[0062] Step 3.3

[0063] The ear piece assembly 11 and the base plate 12 are riveted together with pins, and the ear piece positioning seat 27, ear piece positioning shaft 25 and positioning bushing 26 are removed.

[0064] Step 4: Machining the ear plate assembly 11 and the clearance groove 14 of the base plate 12

[0065] Step 4.1 Clamping and Alignment

[0066] On a 3-axis vertical CNC machining center, the product with assembly fixtures is placed using a square box to ensure that the bottom surface of the base plate 12 is perpendicular to the machine tool worktable, while simultaneously... Figure 3 The X-axis of the assembly fixture shown is aligned with the X-axis of the machine tool;

[0067] Step 4.2 Machining the clearance grooves 14 of the ear assembly 11 and the base plate 12 to ensure that the position of the ear assembly 11 and the clearance grooves 14 of the base plate 12 are consistent.

[0068] Step 4.3 Finish the shape and dimensions of the ear plate assembly 11, and ensure that the symmetry accuracy between the ear plate assembly 11 and the base plate 12 is within 0.05mm.

[0069] Step 4.4 Finish machining the φ5mm hole on the ear plate assembly 11 to φ8+0.05mm, and ensure the hole position accuracy.

[0070] Step 5: Machining mounting holes 121 for the suspension assembly

[0071] Step 5.1 Place the bottom surface of the assembly fixture flat on the worktable of the 3-axis vertical CNC machining center, and make... Figure 3 The X-axis of the assembly fixture shown is aligned with the X-axis of the machine tool;

[0072] Step 5.2 Machining 6 suspension component mounting holes 121 at corresponding positions on the base plate 12.

[0073] Step 6: CVI-Si3N4 vapor deposition

[0074] Remove the base plate 12 and ear assembly 11 from the assembly fixture, and use a dedicated CVI-Si3N4 vapor deposition process to deposit the base plate 12 and ear assembly 11 to achieve the required density.

[0075] The material is loaded into a dedicated CVI-Si3N4 vapor deposition furnace and deposited to the required density using a dedicated CVI-Si3N4 vapor deposition process.

[0076] Step 7: Fitter

[0077] Remove the surface slag from the base plate 12 and ear assembly 11, remove the burrs, and finely ream the φ8+0.05mm hole to the required size;

[0078] Step 8: Assemble the suspension assembly 13

[0079] Assemble the base plate 12 and ear assembly 11 onto the assembly fixture. Position them using positioning block 23, V-block 22, ear positioning shaft 25, positioning bushing 26, and ear positioning seat 27. The length of positioning bushing 26 is slightly larger than that of positioning bushing 26 in step 3 to accommodate the size of the ear assembly 11 after fitting and vapor deposition, ensuring that both ends fit the outer periphery of the pre-made hole 115 and the outer periphery of the first through hole, respectively. Install the suspension positioning seat 28 at the corresponding position on the base 21, and then install the suspension assembly 13, ensuring that the bottom surface of the suspension assembly 13 fits the upper surface of the base plate 12. Smoothly pass the suspension positioning shaft 29 through the hole of the suspension assembly 13 and the hole on the positioning seat of the suspension assembly 13, while ensuring that the mounting holes on the suspension assembly 13 correspond one-to-one with the suspension assembly mounting holes 121 on the base plate 12.

[0080] Step 9: Rivet the base plate 12 to the suspension assembly 13 to complete the sealing sheet processing.

Claims

1. An assembly fixture for a ceramic-based composite sealing sheet for an aero-engine, used for processing the ceramic-based composite sealing sheet, wherein the ceramic-based composite sealing sheet includes an ear assembly (11), a base plate (12), and a suspension assembly (13); the ear assembly (11) is located at one end of the base plate (12), its bottom is in contact with the base plate (12), and a pre-drilled hole (115) is provided thereon for connecting external components; the suspension assembly (13) is located in the middle of the base plate (12), and a suspension hole is provided thereon; the other end face of the base plate (12) has an arc-shaped profile; Its features are: Includes a base (21), a V-shaped block (22), multiple positioning blocks (23), multiple clamping blocks (24), an ear plate positioning shaft (25), a positioning bushing (26), an ear plate positioning seat (27), and a suspension positioning assembly; The base (21) is used to set the base plate (12), and the end shape of the base (12) corresponds to the shape of the base plate (12); the V-shaped surface of the V-shaped block (22) is set to the other end face of the base plate (12) and is detachably connected to the base (21); multiple positioning blocks (23) are respectively set on the base (21) on both sides of the base plate (12) and cooperate with the V-shaped block (22) to limit the base plate (12); multiple clamping blocks (24) are respectively set on the base (21) on both sides of the base plate (12) and are used to clamp the positioned base plate (12); The ear piece positioning seat (27) is set at one end of the base (21) and is detachably connected to the base (21). The ear piece positioning seat (27) is provided with a first through hole, which corresponds to the pre-made hole (115) of the ear piece assembly (11). The ear piece positioning shaft (25) is set through the first through hole and the pre-made hole (115). The positioning bushing (26) is sleeved on the ear piece positioning shaft (25) between the first through hole and the pre-made hole (115). One end of the suspension positioning component is detachably connected to the base (21), and the other end is used to position the suspension component (13).

2. The assembly tooling for a ceramic-based composite sealing sheet for an aero-engine according to claim 1, characterized in that: The suspension positioning assembly includes a suspension positioning seat (28) and a suspension positioning shaft (29). The suspension positioning assembly is detachably connected to the base (21) via the suspension positioning seat (28). The suspension positioning seat (28) is provided with an extension, and the extension is provided with a second through hole coaxial with the suspension hole on the suspension assembly (13). The suspension positioning shaft (29) passes through the second through hole and the suspension hole to position the suspension assembly (13).

3. The assembly tooling for a ceramic-based composite sealing sheet for an aero-engine according to claim 1 or 2, characterized in that: The number of clamping blocks (24) is at least four, and the number of positioning blocks (23) is at least two; At least two first limiting grooves (231) are provided on the base (21) at positions corresponding to both sides of the base plate (12), and the positioning block (23) is disposed in the first limiting groove (231).

4. The assembly tooling for a ceramic-based composite sealing sheet for an aero-engine according to claim 3, characterized in that: Four clamping blocks (24) are provided on the base (21), and two are provided on each side of the base plate (12). The distance between two clamping blocks (24) on the same side of the base plate (12) is 1 / 2-2 / 3 of the length of the base plate (12).

5. The assembly tooling for a ceramic-based composite sealing sheet for an aero-engine according to claim 4, characterized in that: The distance between the V-shaped block (22) and the positioning block (23) along the length of the base plate (12) is greater than or equal to 2 / 3 of the total length of the base plate (12); The base (21) is provided with a matching second limiting groove (221) corresponding to the position of the V-block (22). The V-block (22) is set in the second limiting groove (221) to adjust the movement of the base plate (12) along the length direction caused by the total length tolerance.

6. The assembly tooling for a ceramic-based composite sealing sheet for an aero-engine according to claim 5, characterized in that: The base (21) and the ear plate positioning seat (27) are pre-tightened with internal hexagonal head screws and a cylindrical pin is provided for positioning to ensure that the base (21) and the ear plate positioning seat (27) do not have relative displacement. The suspension positioning assembly is pre-tightened on the base (21) by an internal hexagonal head screw and is positioned by a cylindrical pin.

7. The assembly tooling for a ceramic-based composite sealing sheet for an aero-engine according to claim 6, characterized in that: It also includes a notch (211) at one corner of the base (21) near the ear assembly (11) and a plurality of grooves (212) at the bottom of the base (21); the notch (211) prevents interference with other structures when processing the ear assembly (11); the plurality of grooves (212) are used to reduce the contact area of ​​the base (21) to ensure the bottom plane accuracy of the base (21).

8. A method for processing a ceramic matrix composite seal piece of an aeroengine, using the assembly tooling of any one of claims 1-7, wherein, Includes the following steps: Step 1: Install the base plate (12) on the base (21) of the assembly fixture, use V-blocks (22) and positioning blocks (23) to position it, and then fix the base plate (12) by clamping blocks (24); Step 2: Assemble the ear piece assembly (11) onto the base plate (12), and modify the bottom of the ear piece assembly (11) so that the bottom of the ear piece assembly (11) fits against the upper surface of the base (21). Insert the ear piece positioning shaft (25) into the pre-made hole (115) and the first through hole of the ear piece assembly (11), and at the same time set the positioning bushing (26). The two ends of the positioning bushing (26) fit against the outer periphery of the pre-made hole (115) and the outer periphery of the first through hole, respectively. Step 3: Rivet the ear plate assembly (11) and the base plate (12) parts with ceramic composite rivets, and remove the ear plate positioning shaft (25), positioning bushing (26), and ear plate positioning seat (27); Step 4: Finish machining the ear plate assembly (11) to ensure the center symmetry between the ear plate assembly (11) and the base plate (12); machine the clearance grooves (14) of the ear plate assembly (11) and the base plate (12) to ensure the consistency and position of the clearance grooves (14); finish machining the pre-drilled mounting holes on the ear plate assembly (11) to the required size; machine the suspension assembly mounting holes (121) on the base plate (12); Step 5: Remove the base plate (12) and ear assembly (11) from the assembly fixture, and then deposit them through a vapor deposition process to achieve the required density. Step 6: Grind the surface scum of the base plate (12) and ear plate assembly (11), remove burrs, and finely ream the holes; Step 7: Assemble the base plate (12) and ear plate assembly (11) onto the assembly fixture, and then install the suspension assembly (13). Position the suspension assembly (13) using the suspension positioning assembly. Step 8: Rivet the base plate (12) and the suspension assembly (13) to complete the sealing component processing.

9. The processing method of a ceramic matrix composite sealing sheet for an aero-engine according to claim 8, characterized in that: In step 1, the V-block (22) and positioning block (23) are used for positioning, specifically as follows: Make the other end of the base plate (12) of the ceramic matrix composite sealing sheet fit with the V-shaped surface of the V-block (22), and then insert two positioning blocks (23) into the base (21). A fixed gap is left between the positioning blocks (23) and the base plate (12). Then, insert two standard gauge blocks of equal thickness into the fixed gap to detect and determine the correct position of the base plate (12) tooling. Step 7 is as follows: Assemble the base plate (12) and ear plate assembly (11) onto the assembly fixture, and use the positioning block (23), V-block (22), ear plate positioning shaft (25), positioning bushing (26) and ear plate positioning seat (27) to position them, wherein the length of the positioning bushing (26) is greater than that of the positioning bushing (26) in step 2; install the suspension positioning seat (28) at the corresponding position on the base (21), and then install the suspension assembly (13) to ensure that the bottom surface of the suspension assembly (13) is in contact with the upper surface of the base plate (12), and pass the suspension positioning shaft (29) through the hole of the suspension assembly (13) and the hole on the positioning seat of the suspension assembly (13) to ensure that the mounting hole on the suspension assembly (13) corresponds one-to-one with the mounting hole (121) of the suspension assembly on the base plate (12).

10. The processing method of a ceramic matrix composite sealing sheet for an aero-engine according to claim 9, characterized in that: In step 1, the fixed gap is 1mm; In step 2, the fit gap between the bottom of the ear piece assembly (11) and the base plate (12) is ≤0.1mm.

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