Disassembling method for rivets on composite material closed tubular beam

Abstract

The invention belongs to the technical field of composite material structure repair, and particularly relates to a method for disassembling rivets on a composite material closed tubular beam. The adhesion strip with proper adhesion performance and physical state is placed on the back surface of the riveting rivet in advance, so that the redundant objects such as pier heads and chippings generated by decomposing the rivet can be fixed in the adhesion strip instead of falling into the pipe beam part. The invention aims to solve the problem of disassembly of the rivet in the closed tubular beam, and by means of a method of forming the maintenance hole, taking out the redundant material for disassembling the rivet from the tubular beam by using the adhesive strip and blocking the hole, the redundant material such as a rivet rod, a rivet pier head and the like after the rivet is disassembled is prevented from falling into the helicopter tubular beam, so that the service life of the rivet is prolonged. Therefore, the damage to products caused by abnormal sound or long-term impact of rivet pier heads on tubular beam parts in the follow-up flying process of the helicopter is avoided.

Description

technical field [0001] The invention belongs to the technical field of composite material structure repair, and in particular relates to a method for disassembling rivets on composite material closed pipe beams. Background technique [0002] The composite pipe beam is the supporting skeleton of the helicopter's front canopy structure. The pipe beam is a tubular part with a shape, and the end is sealed after preliminary bonding. Riveting is often performed on the pipe beam structure to ensure the connection strength or meet various individual needs, such as riveting brackets for connecting interior decoration, finished products, and other parts. [0003] Disassembly of rivets becomes a problem when there is a problem with the riveted rivet or when the rivet needs to be disassembled due to changes in requirements during subsequent use. Because the rivet head or other debris generated when the rivet is disassembled will fall into the inside of the pipe beam parts and become re...

AI Technical Summary

Problems solved by technology

[0006] 1) It can only solve the problem of excess material after the disassembly of rivets when the closed pipe beam structure is in the state of uninstalled parts or small components, but cannot solve the problem of excess material after the disassembly of rivets in the installed state of the pipe beam;

[0007] 2) To solve the problem of redundant objects after the rivets are disassembled when the closed pipe beam structure is in the state of uninstalled parts or small components, it is necessary to make at least two additional holes, one for the glue injection hole and one for the glue injection hole. Glue overflow holes during gluing, the number of holes is large and the requirements for the hole position are high, the wrong hole position will not be able to effectively wrap and fix the excess;

[0008] 3) The amount of injected glue is relatively large

Since only a rough judgment can be made on the position of the excess, and the position of the pipe beam is different, the position of the excess is different. Therefore, it is necessary to drill a hole at a safer position for the rivet attachment, and the amount of glue injection needs to reach the overflow hole to allow glue to overflow. Due to the low accuracy of judging the position of the rivet pier head, it often happens that the punching position is far away from the rivet position, so the amount of glue injected is too large; for helicopters, weight is a key parameter, and the injection of glue Increased part weight;

[0009] 4) The success rate is not high

Due to the large number of excess debris, it is often not completely fixed to the inside of the glue after the glue is injected, and there is still a free-moving excess; or the bonding interface between the glue and the inside of the pipe beam is not firm, resulting in the cured glue. The liquid block shakes inside the pipe beam as a whole

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