Preparation method of light unmanned plane wing with high strength and low density

Abstract

The invention relates to a preparation method of a light unmanned plane wing with high strength of low density. (1) preparing a magnesium alloy ingot; (2) annealing after machining of the magnesium alloy ingot; (3) carrying out extrusion preparation: respectively heating the magnesium alloy ingot obtained in step (2), a die and an extrusion barrel; (4) extruding the magnesium alloy ingot obtained in step (3) to obtain a profile and dragging, (5) cutting the profile obtained in step (4); (6) machining a product obtained in step (5), then quenching, carrying out aging treatment, and then naturally cooling to room temperature; (7) machining the material obtained in step (6) so as to obtain the required unmanned plane wing. The preparation method is simple in process and easy to implement, can effectively solve the weight problem of the unmanned plane while ensuring the strength of the product, can improve flight efficiency, flight height and safety, and can reduce fuel consumption.

Description

technical field [0001] The invention relates to the fields of metal materials and aerospace, in particular to a method for preparing a high-strength, low-density lightweight unmanned aerial vehicle wing. Background technique [0002] The advantages of UAV (Unmanned Aerial Vehicles) such as low cost, zero casualties, and high mobility make it widely used in the military field, and it is a hot spot in the development of military weapons in the world today. As a new type of aviation combat weapon, UAV has the following common technical characteristics and requirements from the perspective of airframe platform technology: low cost, light structure, high stealth, long endurance, high service life, and long storage life. Compared with unmanned combat aircraft, there are also requirements for high maneuverability and large overload. The above-mentioned characteristics and requirements determine that in the design of the airframe structure, the airframe parameters and flight parame...

AI Technical Summary

Problems solved by technology

Composite wing rib web openings cause fibers to be cut off, and the fiber bearing capacity is reduced. Generally, the shear capacity is restored by reinforcing the opening area. Compared with the web without openings, the weight reduction potential is reduced, and the weight reduction advantages of composite materials are not exerted.

[0006] (4) Due to the poor electrical conductivity of composite materials, the EMC (electromagnetic compatibility) efficiency of composite ribs is lower than that of metal ribs

[0008] ⑹The design of composite rib connection is also very complicated

[0010] ⑴Magnesium alloy materials have poor fluidity during the extrusion process. If the temperature and speed are not controlled accurately, it is very easy to have incomplete mold filling, especially the extrusion speed.

When the deformation speed increases again, although the temperature rise of the blank is obvious, because the work hardening speed of the metal during the deformation process is faster than the recrystallization softening process, the flow stress of the billet not only does not decrease, but increases significantly, so that the extruded The shape of the profile is defective and cannot meet the standard

[0011] (2) Metal magnesium has a close-packed hexagonal structure, so the plastic deformation ability of magnesium alloy is poor. At high temperature, twin crystal slip is easy to occur, and the plastic deformation ability is improved. However, if the temperature is too high, the grain growth will be caused, and the plastic deformation ability will be reduced. and will affect the strength of the product

At the same time, for special-shaped materials such as aircraft wings, the wall thickness of the wing is only 1mm, which is far lower than the level of 2mm in the same industry. The extrusion ratio is very large during the extrusion process, and there is a large friction between the material and the mold. The extrusion process will generate very high heat, which makes it difficult to control the temperature during the extrusion process, resulting in products that are prone to peeling, tearing, and rough surfaces, affecting quality