A tool for repairing the flow channel of an axial casing of an aero-engine

Abstract

The present invention relates to a tool for repairing the flow path of an axial casing of an aero-engine. The tool for repairing the flow path of the axial casing of the aero-engine includes a first protective ring adapted to the second-stage stator blade mounting groove, a second protective ring adapted to the third-stage stator blade mounting groove, a spigot protective ring, and a plurality of plugs adapted to the stator blade mounting holes. The outer wall of the first protective ring is in small-clearance fit with the inner wall of the second-stage stator blade mounting groove. The outer wall of the second protective ring is in small-clearance fit with the inner wall of the third-stage stator blade mounting groove. The spigot protective ring is sleeved on the left-end spigot of the axial casing. During assembly, the first protective ring and the inner wall of the second-stage stator blade mounting groove, and the second protective ring and the inner wall of the third-stage stator blade mounting groove are adhesively fixed with glue. The plugs and the stator blade mounting holes are adhesively fixed with glue.

Description

Technical Field

[0001] The present invention relates to the technical field of auxiliary equipment for aero-engine repair, in particular to a usage method of a tool for repairing the flow passage of an axial-flow casing of an aero-engine. Background Art

[0002] The axial-flow casing of a certain type of aero-engine is of a split structure, and the blank is made of an integral casting. Its structure is as Figure 1 shown. After installation, a first inner flow passage 1, a second inner flow passage 2, a third inner flow passage 3, and a fourth inner flow passage 5 with different inner diameters are formed. Among them, a plurality of stator vane mounting holes 10 are circumferentially arranged on the second inner flow passage 2. A T-shaped secondary stator vane mounting groove 4 is formed between the third inner flow passage 3 and the fourth inner flow passage 5. A T-shaped tertiary stator vane mounting groove 7 is formed between the fourth inner flow passage 5 and the tail side end 6. And Al-Si coatings are applied to the inner walls of the first inner flow passage 1, the third inner flow passage 3, and the fourth inner flow passage 5. When machining the inner flow passage of the above-mentioned aero-engine axial-flow casing, a set of data points is used for control, and the numerical control turning method is adopted. Whether the processed dimensions are accurate is particularly important for controlling the performance parameters of the compressor. In actual machining, due to factors such as machining operation errors and deformation of thin-walled parts, the inner flow passage is out of tolerance. After scanning and measuring the flow passage of the casing assembly, it is found that the overall size of the flow passage deviates outward from the theoretical value by about 0.15 - 0.20 mm, and the overall flow passage expands outward and deviates from the theoretical value, which greatly affects the performance parameters of the compressor. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a usage method of a tool for repairing the flow passage of an aero-engine axial-flow casing that is easy to assemble and convenient to operate.

[0004] To solve the above technical problem, the tool for repairing the flow passage of an aero-engine axial-flow casing provided by the present invention includes a first protective ring adapted to the secondary stator vane mounting groove, a second protective ring adapted to the tertiary stator vane mounting groove, a spigot protective ring, and a plurality of plugs adapted to the stator vane mounting holes. The outer wall of the first protective ring has a small clearance fit with the inner wall of the secondary stator vane mounting groove. The outer wall of the second protective ring has a small clearance fit with the inner wall of the tertiary stator vane mounting groove. The spigot protective ring is sleeved on the left end spigot of the axial-flow casing. During assembly, the first protective ring and the inner wall of the secondary stator vane mounting groove, and the second protective ring and the inner wall of the tertiary stator vane mounting groove are adhesively fixed with glue, and the plugs and the stator vane mounting holes are adhesively fixed with glue.

[0005] Further, the first protective ring is composed of two first half-ring bodies of the same structure spliced together, and the second protective ring is composed of two second half-ring bodies of the same structure spliced together.

[0006] Further, the first half-ring body, the second half-ring body, the plugs, and the spigot protective ring are obtained by turning aluminum alloy.

[0007] The usage method of the tooling for repairing the flow passage of the axial-flow casing of an aero-engine includes the following steps. First, insert two first half-ring bodies into the second-stage stator blade installation groove, and apply glue between the first half-ring bodies and the second-stage stator blade installation groove. The first half-ring bodies form the first protection ring. Insert two second half-ring bodies into the third-stage stator blade installation groove, and apply glue between the second half-ring bodies and the third-stage stator blade installation groove. The second half-ring bodies form the second protection ring. Bond each plug to the stator blade installation hole to seal the stator blade installation hole. Fix the spigot protection ring to the left-end spigot of the axial-flow casing. Remove the Al-Si coating on the inner walls of the first inner flow passage, the third inner flow passage, and the fourth inner flow passage until the metal matrix is exposed. Perform sandblasting on the metal processing surface to be sprayed to reduce the surface roughness, and then perform overall secondary spraying on the flow passage. Then, re-use the numerical control machining method to machine the first inner flow passage, the third inner flow passage, and the fourth inner flow passage to ensure the flow passage size requirements. Through the protection of the tooling for repairing the casing flow passage, combined with the overall spraying process, the reprocessing of the oversized inner flow passage size of the axial-flow casing is carried out.

[0008] Technical effects of the invention: (1) The tooling for repairing the flow passage of the axial-flow casing of an aero-engine according to the present invention ensures the feasibility of the overall secondary spraying repair scheme for the coating of the inner flow passage of the casing compared with the prior art, protects the precision dimensions from being damaged, and greatly improves the spraying efficiency at the same time. The first protection ring and the second protection ring are obtained by combining half-ring bodies, which are easy to assemble. (2) The first protection ring, the second protection ring, and the plugs are all fixed by gluing with glue, which is convenient for subsequent disassembly. (3) The first half-ring body, the second half-ring body, the plugs, and the spigot protection ring are made of aluminum alloy material, which can prevent the parts from being bruised. Brief Description of the Drawings

[0009] The present invention will be further described in detail below with reference to the accompanying drawings of the specification:

[0010] Figure 1 is a schematic cross-sectional structure diagram of the flow passage of the axial-flow casing of an aero-engine;

[0011] Figure 2 is a schematic cross-sectional structure diagram of the assembled tooling for repairing the flow passage of the axial-flow casing of the present invention;

[0012] In the figure:

[0013] The first inner flow passage 1, the second inner flow passage 2, the third inner flow passage 3, the second-stage stator blade installation groove 4, the fourth inner flow passage 5, the tail side end 6, the third-stage stator blade installation groove 7, the left-end spigot 8, the threaded hole 9, the stator blade installation hole 10, the spigot protection ring 11, the first protection ring 12, the second protection ring 13, the plug 14, the bolt 15, the axial-flow casing 16. Detailed Description of the Embodiment

[0014] Embodiment 1

[0015] As shown Figures 1 to 2 in the figure, the tool for repairing the axial flow casing flow path of an aeroengine in this embodiment includes a first protection ring 12 adapted to the second-stage stator vane mounting groove 4, a second protection ring 13 adapted to the third-stage stator vane mounting groove 7, a spigot protection ring 11, and 30 plugs 14 adapted to the stator vane mounting holes 10. The first protection ring 12 is composed of two first semi-ring bodies spliced together, and the second protection ring 13 is composed of two second semi-ring bodies spliced together; the outer wall of the first protection ring 12 is in small clearance fit with the inner wall of the second-stage stator vane mounting groove 4, and the clearance is less than 2.0 mm. The outer wall of the second protection ring 13 is in small clearance fit with the inner wall of the third-stage stator vane mounting groove 7, and the clearance is less than 2.0 mm. The spigot protection ring 11 is sleeved on the left-end spigot 8 of the axial flow casing 16. A flange is provided on the periphery of the left-end spigot 8, and threaded holes 9 are provided on the flange. The structure of the spigot protection ring 11 includes an integrally formed inner ring platform and an outer ring platform. An inner groove nested with the left-end spigot 8 is formed between the inner ring platform and the outer ring platform. Mounting holes are provided on the outer ring platform. When the spigot protection ring 11 is installed, the inner ring platform is placed inside the left-end spigot 8, and the outer ring platform is placed outside the left-end spigot 8. The spigot protection ring 11 is fixed by the cooperation of bolts 15, mounting holes, and threaded holes. Moreover, the space between the first protection ring 12 and the inner wall of the second-stage stator vane mounting groove 4, and the space between the second protection ring 13 and the inner wall of the third-stage stator vane mounting groove 7 are filled and adhesively fixed with glue. The plugs 14 and the stator vane mounting holes 10 are filled and adhesively fixed with glue. The glue selected is 703 glue.

[0016] Preferably, the first semi-ring body, the second semi-ring body, the plugs 14, and the spigot protection ring 11 are obtained by turning aluminum alloy.

[0017] Embodiment 2

[0018] Usage method of tooling for repairing axial flow casing flow path of aero-engine, including the following steps: First, snap two first half-rings into the second-stage stator vane mounting groove 4, and apply 703 glue between the first half-ring and the second-stage stator vane mounting groove 4. The first half-rings form a circular first protection ring 12. Snap two second half-rings into the third-stage stator vane mounting groove 7, and apply 703 glue between the second half-ring and the third-stage stator vane mounting groove 7. The second half-rings form a circular second protection ring. The gap between the outer wall of the second protection ring 13 and the inner wall of the third-stage stator vane mounting groove 7, and the gap between the outer wall of the first protection ring 12 and the inner wall of the second-stage stator vane mounting groove 4 are both less than 2.0 mm. Each plug 14 is bonded to the stator vane mounting hole 10 with 703 glue to seal the stator vane mounting hole 10. Fix the spigot protection ring 11 to the left spigot 8 of the axial flow casing 16 with bolts 15. Remove the Al-Si coating on the inner walls of the first inner flow path 1, the third inner flow path 3, and the fourth inner flow path 5 until the metal matrix is exposed. Blast the metal processing surface to be sprayed to reduce the surface roughness, and then perform secondary overall spraying on the flow path. Then, reprocess the first inner flow path 1, the third inner flow path 3, and the fourth inner flow path 5 by numerical control machining method to ensure the flow path size requirements. Through the protection of the tooling for repairing the casing flow path, combined with the overall spraying process, the over-tolerance of the inner flow path size of the axial flow casing is repaired and reprocessed.

[0019] Obviously, the above embodiments are merely examples for clearly explaining the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And these obvious changes or variations derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. An industrial fixture for repairing the flow channel of an axial casing of an aeroengine, characterized in that, It includes a first protective ring adapted to the second-stage stator vane installation groove, a second protective ring adapted to the third-stage stator vane installation groove, a spigot protective ring, and a plurality of plugs adapted to the stator vane installation holes. The outer wall of the first protective ring is in small-clearance fit with the inner wall of the second-stage stator vane installation groove. The outer wall of the second protective ring is in small-clearance fit with the inner wall of the third-stage stator vane installation groove. The spigot protective ring is sleeved on the left-end spigot of the axial flow casing. A flange edge is provided around the left-end spigot, and threaded holes are provided on the flange edge. The structure of the spigot protective ring includes an integrally formed inner ring platform and outer ring platform. An inner groove nested with the left-end spigot is formed between the inner ring platform and the outer ring platform. Mounting holes are provided on the outer ring platform. When the spigot protective ring is installed, the inner ring platform is placed inside the left-end spigot, and the outer ring platform is placed outside the left-end spigot. The spigot protective ring is fixed by the cooperation of bolts, mounting holes, and threaded holes. During assembly, the first protective ring and the inner wall of the second-stage stator vane installation groove, and the second protective ring and the inner wall of the third-stage stator vane installation groove are adhesively fixed with glue. The plugs and the stator vane installation holes are adhesively fixed with glue; The plugs and the spigot protective ring are obtained by turning aluminum alloy.

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