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A blunt circle repair method for sharp damage to engine blisk blade pits

A repair method and engine technology, applied in the direction of engine components, machines/engines, blade support elements, etc., can solve problems such as blade weight reduction, large gaps, blade cracks, etc., achieve low heat input, eliminate stress concentration, and improve fatigue resistance performance effect

Active Publication Date: 2021-08-13
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aeroengine blades are easy to form erosion pits due to debris erosion during actual service, which reduces the thickness of the blade end, and even causes a large gap, resulting in a decrease in stage efficiency. In addition, erosion pits caused by erosion The reduction of the weight of the blade will cause the change of the vibration characteristics of the blade, and the resulting stress concentration will lead to cracks and breakage of the blade during operation. Therefore, to repair the erosion pit formed by blade erosion and improve the service life, it is necessary to eliminate the stress concentration of the erosion pit Repairing is the key to solving blade erosion problems
[0003] The existing repair technology basically repairs the erosion pit directly. The stress concentration of the tissue in the erosion pit area is likely to cause poor fatigue resistance of the repaired blade, and it is easy to cause secondary damage during service, which affects the overall service life of the engine.

Method used

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  • A blunt circle repair method for sharp damage to engine blisk blade pits
  • A blunt circle repair method for sharp damage to engine blisk blade pits
  • A blunt circle repair method for sharp damage to engine blisk blade pits

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for repairing blunt circles with sharp damage to engine blisk blade pits, comprising the following steps:

[0033] 1) Use sandpaper or steel wool to remove the detachable debris in the damaged area of ​​the blade pit, and use acetone to clean the stains in the damaged area of ​​the pit.

[0034] 2) According to the position of the pit damage of the blade, determine the support position on the back of the blade at the head position. In this embodiment, the maximum envelope line of the support point or support area completely surrounds the in-plane direction of the head position.

[0035] 3) The plug continuously processes the sharp damage area of ​​the pit, and uses the high-speed rotation of the smooth plug and the upsetting pressure to process the sharp damage area of ​​the pit into a smooth inner concave surface.

[0036] 4) Use the method of milling first and then grinding to remove the flash around the pit after step 3.

[0037] 5) Fill the TiAlN filler in...

Embodiment 2

[0039] A method for repairing blunt circles with sharp damage to engine blisk blade pits, comprising the following steps:

[0040] 1) Use sandpaper or steel wool to remove the detachable debris in the damaged area of ​​the blade pit, and use acetone to clean the stains in the damaged area of ​​the pit.

[0041] 2) According to the position of the pit damage of the blade, determine the support position on the back of the blade at the head position. In this embodiment, the maximum envelope line of the support point or support area completely surrounds the in-plane direction of the head position.

[0042] 3) The plug continuously processes the sharp damage area of ​​the pit, and uses the high-speed rotation of the smooth plug and the upsetting pressure to process the sharp damage area of ​​the pit into a smooth inner concave surface.

[0043] 4) Use the methods of milling, turning, grinding and polishing to remove the flash around the pit after step 3.

[0044] 5) Fill the TiCN ...

Embodiment 3

[0046] A method for repairing blunt circles with sharp damage to engine blisk blade pits, comprising the following steps:

[0047]1) Use sandpaper or steel wool to remove the detachable debris in the damaged area of ​​the blade pit, and use acetone to clean the stains in the damaged area of ​​the pit.

[0048] 2) According to the position of the pit damage of the blade, determine the support position on the back of the blade at the head position. In this embodiment, the maximum envelope line of the support point or support area completely surrounds the in-plane direction of the head position.

[0049] 3) The plug continuously processes the sharp damage area of ​​the pit, and uses the high-speed rotation of the smooth plug and the upsetting pressure to process the sharp damage area of ​​the pit into a smooth inner concave surface.

[0050] 4) Use the method of turning, grinding and polishing to remove the flash around the pit after the treatment in step 3.

[0051] 5) Fill the...

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Abstract

The invention discloses a method for repairing blunt circles with sharp damage to engine blisk blade pits, belonging to the technical field of aero-engine repair, comprising: cleaning the pit damage area, using the high-speed rotation of the smooth plug and upsetting pressure to make the pit Plastic rheology occurs in the damaged area to obtain a smooth and concave surface, so that the grain structure of the repaired surface layer is refined and the precompression stress is retained on the surface layer, and then the pits repaired by upsetting blunt circle are filled with high-bonding materials to form a flat surface surface, remove dimples that interfere with the streamlined surface. The surface structure of the repaired pit is refined, leaving pre-compressed stress, which effectively improves the fatigue resistance performance, and is simple and easy, and the repair with low heat input has almost no effect on the base material of the blade pit.

Description

technical field [0001] The invention belongs to the technical field of aero-engine repair, and relates to a method for repairing small-scale damage to blades of an engine blisk, in particular to a method for repairing blunt circles with sharp damage to blades of an engine blisk. Background technique [0002] At present, no breakthrough has been made in the maintenance and protection of aircraft equipment, especially in the repair of aeroengine blades. Aeroengine blades are easy to form erosion pits due to debris erosion during actual service, which reduces the thickness of the blade end and even causes a large gap, resulting in a decrease in stage efficiency. In addition, erosion pits caused by erosion The reduction of the weight of the blade will cause the change of the vibration characteristics of the blade, and the resulting stress concentration will lead to cracks and breakage of the blade during operation. Therefore, to repair the erosion pit formed by blade erosion and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P6/00F01D5/00
CPCB23P6/00F01D5/005
Inventor 杨冠军刘梅军刘宏张高李长久
Owner XI AN JIAOTONG UNIV
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