Detecting method for double-curvature skin part of airplane

Abstract

A detecting method for a double-curvature skin part of an airplane comprises the steps that a detecting mould is arranged, a convex profile matched with a skin theoretical model is arranged on the detecting mould, the convex profile is a detecting datum face, datum holes are formed in the convex profile and correspond to positioning holes in the double-curvature skin part, and the machined double-curvature skin part is placed on the detecting mould to be positioned and fixed; space coordinate values of a plurality of detecting points are measured on the surface of the skin part through a measuring instrument, and a computer of the measuring instrument automatically forms a virtual model of the double-curvature skin part in a fitting mode according to the space coordinate values of all thedetecting points; and the skin theoretical model and the virtual model are positioned on the computer through the datum holes and the datum face, thus stacked assembling is completed, the normal distance from any to-be-detected point on the virtual model to the theoretical model is measured, and the normal distances between all the detected points and the theoretical model are compared, so that the attaching degree of any space point on a double-curvature skin can be detected precisely.

Description

technical field [0001] This application relates to the skin detection technology in the field of aircraft manufacturing, specifically a detection method for the spatial fit of the skin, especially suitable for the detection of the fit of the non-visible area in the middle of the hyperbolic skin of the aircraft Background technique [0002] As the outer surface of the aircraft, the processing quality of skin parts directly affects the assembly precision of large parts of the aircraft, the aerodynamic efficiency of the whole aircraft, and even the use function. In order to realize the special performance requirements of modern aircrafts such as stealth, each component of the aircraft needs to ensure a smooth appearance after assembly. In order to avoid the impact of the stress assembly of the skin belt on the shape accuracy of the whole machine, improving the accuracy of the mold before the skin assembly is the key technology to ensure the shape accuracy of the whole machine a...

AI Technical Summary

Problems solved by technology

The disadvantage of its detection is that the feeler gauge can only detect the degree of fit of the outer edge of the skin or the area with holes in the middle, and the degree of fit cannot be judged for most of the non-visible space areas of the skin. It can only be judged by experience. Uncertain factors in judging the accuracy of the mold, which affect the overall shape accuracy requirements of the aircraft after assembly

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