Repairing process for aircraft skin surface defects

Abstract

The invention provides a repairing process for aircraft skin surface defects. The process comprises the following steps: (1) surface treatment of parts; (2) epoxy putty preparation; (3) putty coating:the prepared epoxy putty is evenly brushed or scraped to the cleaned to-be-repaired part of metal parts through a banister brush or a scraper; (4) curing: the metal parts coated with the epoxy puttyis cured at room temperature or by heating; and (5) shape modification: after the putty is cured, the repaired part of the parts is polished. The repairing process for aircraft skin surface defects can well solve the surface defect problem of aluminum alloy, glass fiber reinforced plastic and other substrates, is simple and convenient to operate, can effectively avoid the problems of reworking, scrapping and the like of parts, reduces the production cost, shortens the delivery period, improves the product quality, and is suitable for popularization and application.

Description

technical field [0001] The invention relates to a process for repairing defects on the surface of aircraft skins, in particular to repairing defects such as pits and steps of metal parts and poor glue in glass fiber reinforced plastics. Background technique [0002] In the field of aviation manufacturing, in order to ensure the flight performance of the aircraft, there are strict requirements on the gap and step difference between parts during the design and manufacturing process. The current aircraft of the third generation and below adopts the sheet riveting process in its assembly process, the aircraft parts are large in size, the structural shape and assembly relationship are complex, and the sheet metal parts are easy to deform and produce pits during the assembly process, resulting in multiple The gaps and steps between the assembled parts exceed the design tolerance. These situations are difficult to solve during the assembly process, which directly affects the qualit...

AI Technical Summary

Problems solved by technology

The current aircraft of the third generation and below adopts the sheet riveting process in its assembly process, the aircraft parts are large in size, the structural shape and assembly relationship are complex, and the sheet metal parts are easy to deform and produce pits during the assembly process, resulting in multiple The gaps and steps between the assembled parts exceed the design tolerance. These situations are difficult to solve during the assembly process, which directly affects the quality and production progress of the aircraft manufacturing, especially the alignment steps of the aircraft skin, such as handling If it is not good, it will directly affect the aerodynamic layout of the aircraft

[0003] In addition, with the increasing use of composite materials in aircraft, higher requirements are put forward for its performance in the process of aircraft design and manufacturing. However, in the actual production process, due to the complex molding process of composite materials, more or less Different types of manufacturing defects rarely occur. The most common defect is poor glue, but this defect is a non-fatal defect. It is too much of a fuss to cause parts to be scrapped due to this defect, but there is no feasible and effective solution to this defect.