Liquid filling forming method for large-arch-height multi-cavity thin-wall opening inner skin

Abstract

The invention provides a liquid filling forming method for a large-arch-height multi-cavity thin-wall opening inner skin. The liquid filling forming method comprises the following steps that a liquid filling forming mold of an inner skin part is manufactured; an unfolded blank manufactured; liquid filling bulging for the first time is performed; secondary liquid filling bulging is performed; and the appearance is trimmed. A transition forming part is constructed, barbell type internal holes are designed, dangerous deformation areas prone to tearing are avoided, and the hole forming quality in the bulging pressure applying process is guaranteed. A sealing liquid chamber is created by additionally arranging the high-elastic-grade thin rubber pad, and the problem that the inner skin of the deep rib is cracked during forming is solved. The two-pass liquid-filling bulging process is designed, the material deformation limit of a conventional aluminum alloy sheet is improved, the monopoly situation that the large-arch height strengthened inner skin is pressed and formed for a long time is broken, dependence on manual operation skills is reduced, and the production efficiency and the product quality are improved.

Description

technical field [0001] The invention relates to sheet metal part forming technology in the field of aircraft manufacturing, in particular to a liquid-filled forming method and a forming die for thin-walled sheet metal parts with double curvature, large bow height, multiple cavities and internal openings. Background technique [0002] The aircraft housing hatch is a metal plate adhesive structure, which is composed of two layers of inner and outer plate skins. In order to stabilize the strength of the fuselage shell, multiple ring-shaped reinforcing ribs are distributed on the inner skin, and multiple concave cavities are constructed in the inner skin, and an opening corresponding to the outer shape is provided inside each concave cavity. Affected by the aerodynamic shape, the mouth cover has a large curvature and a high bow, which increases the difficulty of forming the inner skin. [0003] In order to reduce the weight of the door cover of the hair room, the panel skin is ...

AI Technical Summary

Problems solved by technology

Due to unstable product quality, difficult control of surface and internal damage after forming, low utilization rate of raw materials, high labor intensity and many other defects of the traditional drop pressing process, it is increasingly unsuitable for the high-quality and high-reliability requirements of active aircraft. Aviation companies are gradually shrinking down the pressure process

[0004] The shape characteristics of the bow height greater than 350mm limit the expanded application of the inner skin in the rubber bag forming process

Images