Aeroengine blade repair and endoscope inspection

In the test run, it will be found that the blades after the overhaul are damaged (the damaged blades mainly appear on the repaired and repaired blades, or formed on the over-fatigued blades), and the damages are all in the overhaul standard. In the range. Therefore, the use of endoscopes to detect and monitor new engines is easier to grasp than to detect and monitor engines after overhaul. It is often encountered that an engine that has been overhauled does not take several hours to find one or another damage. The reason for this is related to the undetectability of invisible damage during the overhaul process (missing inspection and misjudgment), and The welding, machining, heat treatment, surface treatment, etc. of the blade in the repair process have a certain relationship. It is quite difficult for endoscopy inspectors to grasp the relationship between various influencing factors and blades, and to correctly judge the damage shape and development rate of blades. Therefore, if the fracture of the blade is a problem of materials and processing technology, or a problem of the repair manufacturer, the change of the damage form has great uncertainty, and it is difficult for the endoscope to effectively monitor it.

Accidents caused by broken blades still occur. The manufacturer or repairer must eliminate the hidden danger of damage as much as possible.

From the perspective of endoscopic inspection technology, for engines that have been repaired many times, it is often impossible to determine which type of blade (new, repaired or repaired) the damage of the blade exists in the endoscopic inspection. It is impossible to determine which type of blade ultimately caused a major engine failure, nor can it rule out the possibility of missing inspection of the blade during overhaul, so a controllable method or method should be found to eliminate the blade damage zone as much as possible The hidden dangers. In order to achieve this, the author recommends that the repaired and repaired blades be marked clearly, so that the endoscopic inspection personnel can grasp and distinguish the type of the blade (that is, new, repaired, repaired), which has the following advantages:

1. Clarify the detection range of the endoscope and control the development rate of blade damage.

2. Determine or identify which blade damage after repair and repair is caused by the blade damage that occurred before the blade repair but was not detected during the repair and caused the engine failure.

3. It is determined or identified that the repaired and repaired blade damage is the main source of major failures, and the possibility of overhaul quality problems is pointed out through detailed records.

4. From another point of view, the adoption of this method can observe and monitor the quality of the overhaul of the engine's hot components, so as to attract enough attention from the engine repair manufacturer.

JEET is committed to providing customers with professional aviation borescopes detection solutions. It has developed and produced a number of different series of handheld endoscopes, with different probe sizes, different pipeline lengths, and different screen sizes to choose from. You can choose different types of handheld endoscopes according to your needs. If you have any questions, please contact us! 

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