Grinding tool for thickness of sacrificial layer of airplane composite skin

Abstract

The invention discloses a grinding tool for the thickness of a sacrificial layer of an airplane composite skin, and belongs to the technical field of airplane assembly. The tool comprises an air inletnozzle, a starting switch, a turbine motor, a 90-degree angle head, a fastening nut, a flange, a tail end cavity, sealing covers, limiting wheels, a grinding cutter and a sunk screw. By using the tool, the control requirement of the composite skin step difference can be guaranteed with high precision, the limiting wheels with different diameters increase the control range of the skin step difference, and the friction force is greatly reduced through a rolling mode, so that the labor intensity of workers is reduced, and the operation stability and accuracy are guaranteed; and through implementation and application of the grinding tool for the thickness of the sacrificial layer of the airplane composite skin, the tolerance of the ground composite skin is not larger than 0.1 mm, the roughness of the ground surface of the composite skin is not lower than 1.6 micrometers, and the grinding efficiency is not lower than 500 mm / min.

Description

technical field [0001] The invention is aimed at the step difference control requirement in the assembly process of aircraft composite skin, relates to a tool for grinding and finishing the sacrificial layer margin of composite skin, and belongs to the technical field of aircraft assembly. [0002] technical background [0003] Composite skin is a key part of the aerodynamic shape of the aircraft, and its accuracy has an important impact on the improvement of the surface quality of the aircraft. Composite material skin assembly step grinding is the process of grinding off the thickness of the out-of-tolerance composite material sacrificial layer after the panel is formed and performing inversion assembly. During the aircraft assembly process, the main ways to remove the skin step difference on the outer surface are: manually grinding the thickened area of ​​the sunken part of the structure with a belt machine to eliminate the step difference between the skin and the structura...

AI Technical Summary

Problems solved by technology

During the aircraft assembly process, the main ways to remove the skin step difference on the outer surface are: manually grinding the thickened area of ​​the sunken part of the structure with a belt machine to eliminate the step difference between the skin and the structural parts. The operation error of the belt machine is large, and the removal amount cannot be Precise control; the depth of subsidence is controlled by machining, but this removal method is not suitable for composite skins, and the tolerances in the manufacturing process of composite materials are relatively large; step differences are removed by adding solid and liquid gaskets and chamfering. It is difficult to control the thickness of the composite material skin, and the step difference is difficult to meet the design requirements

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