Honeycomb sandwich structure part repairing method for reducing structure loss

Abstract

The invention provides a honeycomb sandwich structure part repairing method for reducing the structure loss. For the defective area abandoning laying layer gradient grinding link, a through hole withsmaller diameter is directly drilled in the defect center, and then a defective area honeycomb core is subjected to full-depth cutting and breaking treatment by using an L-shaped rotating cutting device; it is ensured that the defective area honeycomb core is cut and broken and then pouring sealant injection / stirring is carried out by using the through hole and an injection device, it is ensured that a defect area cavity is fully filled with the pouring sealant, and then a curing process is executed. Due to the fact that the original surface is restored by curing and polishing, the defective area can be fully filled under the condition that an original structural laying layer is damaged to a small degree, and the repairing target is achieved.

Description

technical field [0001] The invention relates to a repair method for composite material parts, in particular to a repair method for honeycomb sandwich structure composite materials. Background technique [0002] With the increasing application of honeycomb sandwich structure composite parts in the aerospace field, damage to composite parts is inevitable in the manufacturing process and actual use, especially for fuselage skins, beams, etc. that require frequent turnover Large parts are easily damaged due to poor protection during storage and circulation processing, and there are also many defects in the core area after bonding due to defects in the honeycomb core itself. These defects often cause the parts to be unable to continue to be processed and the aircraft to be unable to continue to be used. How to quickly and efficiently repair the defects in the core area of ​​the composite material and restore its strength as much as possible when the autoclave forming process cann...

AI Technical Summary

Problems solved by technology

Although this method can completely repair the honeycomb core in the damaged area, it causes great damage to the original normal structural layup. At the same time, grinding the layup and laying up the restored layup puts forward higher requirements for the entire repair cycle, environment, and difficulty. Therefore, it is of great significance and application value for the manufacture of composite sandwich structural parts to develop a process method that can damage the original structure to a lesser extent and reduce the repair complexity and repair cycle.