Abstract: The aero engine is the heart of the aircraft, and its normal operation is crucial to the safety of the aircraft. Among them, turbine blades are an important part of the engine and directly affect the performance and efficiency of the engine. Therefore, regular inspection and maintenance of turbine blades is an important part of ensuring the normal operation of aero engines. This article will introduce in detail the maintenance technology of overhauling aircraft engine turbine blades.

Keywords: aero engine; turbine blade; maintenance technology; overhaul

1. Introduction
The aircraft engine is a key component of the aircraft and is responsible for generating thrust to propel the aircraft forward. As the hot part of the engine, turbine blades are responsible for converting gas energy into mechanical energy and are a key component of the engine’s operation. Since the turbine blades work in a harsh environment and are easily affected by high temperature, high pressure, and other factors, regular inspection and maintenance are required to ensure the normal operation of the engine. This article will introduce the maintenance technology for overhauling aircraft engine turbine blades.

2. Maintenance process of turbine blades

2.1. Preparations before maintenance
Before overhauling turbine blades, a series of preparatory work is required. First, the engine needs to be shut down for inspection to ensure that the engine is in a safe condition. Then, relevant maintenance tools and equipment need to be prepared, including testing instruments, fixtures, etc. In addition, relevant technical information and maintenance manuals for turbine blades need to be prepared for reference and operation.

2.2. Disassembly and inspection of turbine blades
Disassembly of turbine blades is one of the important parts of maintenance. Before disassembly, the disassembly area needs to be cleaned and protected to keep the environment clean and safe. Then, use the corresponding tools and clamps to disassemble the turbine blades to ensure that no damage is caused to the blades during the disassembly process. After the disassembly is completed, the turbine blades need to be cleaned and rust removed to facilitate subsequent inspections.

The inspection of turbine blades is a key link in maintenance and can be carried out in the following ways:

(1) Visual inspection: Observe the surface and structure of the blade with the naked eye to check whether there is obvious damage and wear. The blades will be cleaned and rust removed to facilitate subsequent inspections.

(2) X-ray inspection: Use X-ray equipment to conduct transmission inspection of turbine blades to find cracks and defects inside the blades. By placing the blade under the X-ray equipment and observing the imaging results, the internal structure and defects of the blade can be clearly understood.

(3) Magnetic particle inspection: Apply magnetic powder particles to the turbine blades, and then magnetize the blades. By observing the distribution of magnetic particles on the blade surface, cracks and defects on the blade surface can be found. Magnetic particle inspection can quickly and accurately detect defects on the blade surface and is a commonly used inspection method.

2.3. Repair and heat treatment of turbine blades

Before repairing turbine blades, it is necessary to determine the degree of damage to the blades and the repair plan based on the inspection results. In general, minor surface damage can be ground and polished; for more serious damage and cracks, cutting and welding are required. After the repair is completed, the blade needs to be heat-treated to restore the blade’s material properties and stability.

2.4. Assembly and debugging of turbine blades

The repaired turbine blades need to be assembled and debugged to ensure they work properly. Before assembly, the blades need to be cleaned and rust removed to ensure that the surface of the blades is clean and smooth. The blades are then assembled using the appropriate tools and fixtures to ensure that the position and connection of the blades meet the requirements. After the assembly is completed, simulation runs and tests are required to ensure that the working effect and quality of the blades meet the requirements.

3. Common problems and treatment methods of turbine blades

During the maintenance of turbine blades, the following problems are often encountered:

3.1. Surface wear and scratches
Surface wear and galling are common problems with turbine blades and are primarily caused by contact of the blades with the gas flow. The treatment method generally involves grinding and polishing the blade surface to restore the smoothness and surface finish of the blade.

3.2.Cracks and breakage
Cracks and breakage are serious problems with turbine blades and can lead to blade breakage and failure. The treatment method generally involves cutting and welding the blades to repair the damage to the blades and restore their strength.

3.3.Corrosion and oxidation
Corrosion and oxidation are common problems with turbine blades, mainly caused by long-term exposure of the blades to high temperature, high pressure, and high humidity. The treatment method generally includes cleaning and rust removal of the blades, and applying an anti-corrosion coating on the surface of the blades to prevent further corrosion and oxidation.

4. Quality assurance measures for turbine blades

During the maintenance of turbine blades, a series of quality assurance measures need to be taken to ensure that the quality and performance of the blades meet the requirements. Specific measures are as follows:

4.1. Strictly implement the maintenance manual and relevant technical requirements to ensure that the operating procedures are correct and standardized.

4.2. Use appropriate testing instruments and equipment to ensure accurate and reliable testing results

4.3. During the repair and heat treatment process of turbine blades, strictly control temperature, time, and process parameters to ensure the material performance and stability of the blades.

4.4. Conduct regular quality inspections and assessments, and track and monitor maintenance work.

4.5. Strengthen training and technical guidance for maintenance personnel to improve their operational and technical levels.

5. Conclusion

Overhaul of aircraft engine turbine blades is an important step in ensuring the normal operation of the engine. This article introduces the maintenance process of turbine blades, common problems, and treatment methods, as well as quality assurance measures for turbine blades. Scientific and standardized maintenance of turbine blades can effectively extend the service life of the blades, improve engine performance and efficiency, and ensure aviation safety.