aerospace aluminum extrusions profiles

Large aerospace aluminum extrusions profiles mainly include integral ribbed wall panels, girders, wing girders, hollow large profiles, etc. It is mainly used as the force structural components of aerospace vehicles such as airplanes and spaceships, as well as heterosexual hollow rotor beams and runways of helicopters. The main characteristics of large profiles are as follows:

 
1) Large-scale and integration
 
2) Thin-walled and lightweight,
 
3) refinement of section size and position tolerance
 
4) homogenization and quality of structure and properties
 
Because of the above characteristics of large profiles, it brings a series of difficulties to extrusion processing.


Main requirements for large aerospace aluminum extrusions profiles applications:
1) Common alloys
A. Low strength alloys: industrial pure aluminium, 3A21, 5005, 5A02, 5A03, 5086, etc. are not strengthened after heat treatment. Their semi-finished products are used under annealing and cold hardening conditions.
B. Medium strength alloys are divided into two groups: heat-treated non-strengthening alloys (5A05, 5A06, 5806) and heat-treated Al alloys (6A02, 2A70, 2A06).
C. High strength aluminium alloys 7A04 and 2112 can be sharply strengthened during heat treatment.
2) Large-scale aerospace aluminum extrusions profiles belong to the most important structural parts on aircraft, which require excellent mechanical properties. Therefore, profiles must be extruded with hard or superhard aluminium alloys.
3) Complex shape, large outline size and cross-sectional area. If the outer circle diameter can reach 300-800 mm, the maximum cross-section area can reach 800 cm 2, and the length can reach 18 M. Therefore, extrusion forming is very difficult. It requires not only heavy-duty extruders over 50MN and extrusion cylinders with large diameter and high specific pressure, but also the design and manufacture of large-scale dies, which require highly difficult technology.
4) Because aluminium profiles are used as structural parts in key parts of aircraft, it is necessary to have good comprehensive performance and uniform structure, especially for coarse-grained rings. It is also difficult to avoid the defects of coarse grained rings in quenched products after extrusion.