Auxiliary positioning tool for chemical milling edge of aircraft skin

Abstract

An auxiliary positioning tool for chemical edge milling of aircraft skin comprises a guide magnet, a driven magnet, a connecting support, a marker, an ink guide device and a clamping device. An ink storage cavity of the ink guide device is filled with ink, an ink delivery hole is communicated with a capillary hole of the driven magnet, and a nib is positioned in one of clamping grooves that are evenly spaced peripherally at the bottom of the driven magnet for clamping the nib of the marker. After a reference start point is determined, mating angle of the driven magnet with the guide magnet is adjusted through a position of the marker, any marker is positioned at the start point of a chemical milling step edge, the guide magnet is driven to move along the chemical milling edge of the inner side of aircraft skin, the marker on the driven magnet mating with the guide magnet will record a position of the chemical milling edge of the aircraft skin, a segment recorded by ink flowing out of the capillary hole is a reference line, the tool adapts to certain chemical milling step edges with complex outline and serves for timely correcting a deviation of the marker.

Description

technical field [0001] The invention relates to an aircraft skin chemical milling edge auxiliary positioning tool. Background technique [0002] In order to reduce the total weight of the aircraft, the inner surface of the aircraft skin will be milled with chemical agents to a certain thickness during the manufacturing process, generally 0.020 inches to 0.080 inches, and the edges of the milled area will form steps. The step transition area belongs to the stress concentration area, which is easy to form fatigue cracks, and the layout of fasteners needs to be strictly controlled. The particularity of this position requires that when performing modification or repair in the adjacent area, it is necessary to accurately locate the position of the edge of the step on the outer surface of the skin. There is no similar positioning tool at present, and the method of manual measurement is generally adopted in the industry to solve this positioning problem. After selecting the refere...

AI Technical Summary

Problems solved by technology

This method is not only inefficient, but also there will be measurement errors at each approach point, and more cumulative errors will appear during the entire measurement process, which will eventually affect the positioning accuracy of structural components

The installation error of structural components will further aggravate the stress concentration in this area, and fatigue cracks will occur when the aircraft runs for a long time, which will affect airworthiness and safety

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