A method for repairing through-hole defects in closed cavity structures of composite materials

Abstract

The invention discloses a repairing method for a defective through hole of a composite sealed cavity structure. The repairing method comprises the steps that the size and the position of the defective through hole 1 of the sealed cavity structure are confirmed at first; a composite sheet 2 is manufactured and then placed according to the size and the position of the defective through hole 1, and drilling is conducted; after drilling is conducted and a wire 3 for the composite sheet 2 penetrates through two diagonal rivet holes of the sheet 2, the wire 3 penetrates through two corresponding rivet holes in the periphery of the defective hole 1; after being slightly bent, the sheet 2 is stuffed into the defective hole 1, and the position of the sheet 2 is guided with the wire 3; after the sheet 2 is positioned and clamped with positioning pins 4, the wire 3 is pulled away; after the sheet 2 is riveted with a rivet 6, the defective through hole 1 is filled with glass fiber fabric 5 impregnated with glue, and the outer surface of the defective through hole 1 is laid with glass fiber fabric 5 impregnated with glue; and after the glue is cured and the surface is cleaned, repairing is completed. According to the repairing method for the defective through hole of the composite sealed cavity structure, the cost is low, the efficiency is high, losses caused by part replacement are avoided, and the strength is high after repairing is conducted.

Description

technical field [0001] The invention belongs to the field of composite material molding repair, and relates to a method for repairing the through-hole defect of a composite material closed cavity structure. Background technique [0002] Composites products are already used extensively on aircraft. It has become a major trend to use composite materials for main structures such as wings and rudder surfaces. The structures of wings, rudder surfaces and other components are very complex and most of them are closed cavity structures, and the manufacturing cost is very high. Therefore, low-cost composite repair technology with high strength recovery after repair is extremely critical. [0003] The existing repair method for this type of defect is to block the defect hole on the outer surface after dipping dry glass cloth in glue. The result of the repair is only to repair the appearance without reinforcing the product structure, leaving hidden dangers. Contents of the inventio...

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Problems solved by technology

[0004] Purpose of the present invention: the purpose of the present invention is to propose a method capable of quickly repairing through-hole defects in closed cavity structures of composite materials for the shortcomings that existing repair methods cannot be reinforced.

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