Front fuselage barrel section butt joint low-stress assembly method

Abstract

The invention discloses a front fuselage barrel section butt joint low-stress assembly method, and belongs to the technical field of aircraft assembly. According to the method, a clamping plate structure form of a front fuselage general assembly tool is changed, a small organ type suction cup is laid and installed to adsorb a product with a plate, a vacuum tank and a vacuum pump serve as a wind power supply system, and an electric appliance system is assisted to provide control, inspection and alarm of air pressure of an air source, so that the butt joint process of front fuselage barrel sections is achieved. A tensile force generated when the vacuum suction cup adsorbs the barrel section product does not generate local deformation influence on the skin, and compared with a physical rigid clamp, due to the fact that the suction force is controllable, stress damage to the barrel section product cannot be generated.

Description

technical field [0001] The invention belongs to the technical field of aircraft assembly, and in particular relates to a low-stress assembly method for docking barrel sections of a front fuselage. Background technique [0002] In the final assembly station of the barrel section of the front fuselage of the A220 project, the problem of out-of-tolerance profile of the butt joint belt plate occurred in several consecutive racks, which could not meet the profile requirement of ±0.015 inches specified in the drawings. The existing solution is to increase the contact surface of the cantilever type physical fixture, and increase the number of physical fixtures to ensure that the gap between the belt plate and the clamping plate is eliminated as much as possible. [0003] However, through verification, it was found that the position of the tooling was limited due to the narrow assembly space of the product, the added physical compactor could not perform rigid compression, the gap be...

AI Technical Summary

Problems solved by technology

[0003] However, through verification, it was found that the position of the tooling was limited due to the narrow assembly space of the product, the added physical compactor could not perform rigid compression, the gap between the strip plate and the clamp plate still existed, and the measurement results still had the risk of out-of-tolerance. Use discarded long trusses from stock to cut off a fixed length, use wooden blocks and tooling outer clamping plates as bearing points, and use process bolts and pads to eliminate the gap between the skin and the outer clamping plate, but this method needs to remove some fasteners, It is easy to cause product scratches and out-of-tolerance holes, which have a great impact on product assembly quality and production progress; therefore, from the perspective of cost saving, shortened production cycle and improvement of assembly quality, it is decided to focus on the project.

Images