The shape of the aircraft is formed and maintained by the skin, which gives the aircraft good aerodynamic properties. The skin is divided into upper wing, lower wing and fuselage skin, etc. Because it bears aerodynamic effects and transmits the force to the body frame, the forces are complex. Generally, aircraft skins require high compressive strength, stiffness and stress corrosion resistance. In addition to the above requirements, lower wing and fuselage skins also require high fatigue strength, fatigue crack growth resistance and fracture toughness. In addition, the skin is in direct contact with the outside world and requires a smooth surface.
The production process of aircraft skin is usually: rolling plate-annealing-cleaning-solid solution heat treatment-stretching-natural aging-machining-surface treatment. In order to meet the needs of aircraft skin work, many heat treatment manufacturers use ultrasonic induction annealing machines for annealing heat treatment, with good results. The specific process is as follows:
An ultrasonic induction annealing machine is used to perform annealing heat treatment on the aircraft skin. The annealing temperature is generally 495-503°C. After inspection, the mechanical properties, hardness, microstructure and surface condition of the aircraft skin after annealing all met the technical requirements.
The heat treatment process is a key factor affecting the quality of the workpiece's heat treatment. Therefore, it is very important to master the heat treatment process of the workpiece. If you don’t understand anything about the heat treatment process mentioned above, you can read more books on heat treatment. I believe you will gain a lot.
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