Composite material skin net edge coordination tools and assembling method for skins

Abstract

The invention relates to composite material skin net edge coordination tools and an assembling method for skins. The method comprises following steps: 1) arranging coordinators on the skin assembling tools, wherein the coordinators are provided with coordination holes; 2) mounting the skins on corresponding assembling racks, and prepositioning and clamping the skins; 3) drilling technologic holes in the skins through the coordination holes in the net edge coordinators; 4) positioning and fixing the skins on the corresponding racks through the coordination holes in the skins; 5) drawing net edge lines on the surfaces of the skins by the use of line drawing templates; 6) performing trimming based on the net edge lines after the skins are disassembled; and 7) assembling and positioning the different skins on an assembly frame through butt joint coordination holes. According to the invention, the net edge size of the skins are determined through the cooperation of the net edge coordinators and the line drawing templates, and the skins are positioned through the butt joint coordination holes in an assembling process, so that the accuracy of the net edge size of the composite material skins is improved, the structure of the frame is simplified, the operation is easy and visual, and the assembling efficiency is improved.

Description

technical field [0001] The invention relates to a composite material skin clean edge coordination tooling and assembly method suitable for aircraft and other products, which is suitable for high-quality assembly of composite material aircraft skin, improves the processing and assembly efficiency of composite material skin clean edge, and the seam gap between skins precision, etc., which belong to the technical field of composite material component processing and assembly. Background technique [0002] With the continuous improvement of aerodynamic shape, strength and other performance requirements of aircraft and other products, composite materials have also been more and more widely used. A large number of composite material structures are used in the fuselage, wings and other parts, especially the shape of the airframe is composed of several large-scale overall composite skins. As a key part of the aerodynamic shape, its shape is complex, its size range varies greatly, an...

AI Technical Summary

Problems solved by technology

Due to its material characteristics, the processing and assembly of composite skin is somewhat different from that of metal skin, and it is even more complicated. It is impossible to use the previous processing and assembly process of metal skin to determine the net edge of composite skin.

[0003] The existing technology has the following problems: First, since the composite material skin is integrally formed, the shape accuracy of the part determines the aerodynamic shape accuracy of the aircraft to a large extent, but the existing composite material skin will produce certain deformation after molding Therefore, it is impossible to accurately determine the accuracy of the position of the net edge in the state of the part; second, composite materials are difficult-to-machine materials. Compared with metal materials, it is time-consuming and labor-intensive to repair and grind the net edge with repeated trial and error, and the assembly efficiency is low. For those with mutual docking requirements skin, the existing net edge repair method is to use the method of repeated trial and error to determine the net edge accuracy of each skin, so as to determine the final skin seam gap size

Third, repeated repairs require a high level of skill for the workers, and the results obtained vary from person to person. The repaired skin gaps often have quality defects such as uneven size and serious local out-of-tolerance

Fourth, in the final assembly and docking process of the skin, a large number of shape clamps have been developed to control the shape accuracy, resulting in a complex structure of the frame, and the trial fitting process of the skin must be continuously disassembled and installed. The operation is inconvenient and difficult. shorten assembly cycle

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