Adhesion method for expanded bonding surface of metal silencing structure

Abstract

The invention discloses an adhesion method for an expanded bonding surface of a metal silencing structure. The adhesion method comprises the following steps: (1) selecting a metal silencing structure,wherein the metal silencing structure is composed of an aluminum metallic honeycomb and perforated skin arranged on the aluminum metallic honeycomb; taking out the perforated skin, and arranging a non-supporting adhesive film at the top of the aluminum metallic honeycomb; (2) forming a perforation in a position, which is aligned at the center of a honeycomb hole of the aluminum metallic honeycomb, on the non-supporting adhesive film, pre-treating the non-supporting adhesive film by hot air, partially melting the non-supporting adhesive film, and shrinking the adhesive film onto a section of the aluminum metallic honeycomb; (3) laying the perforated skin on the non-supporting adhesive film, and curing, so as to obtain the metal silencing structure. According to the method, the silencing effect and bonding strength can be taken into account, and the adhesive property of the metal silencing structure can be ensured.

Description

technical field [0001] The invention belongs to the technical field of aircraft maintenance, and in particular relates to a bonding method for expanding the bonding surface of a metal sound-absorbing structure. Background technique [0002] The V2500 thrust reverser has a metal sound-absorbing structure, which is made of perforated skin and aluminum metal honeycomb bonding to reduce the noise of the high-speed airflow in the external duct. When the V2500 thrust reverser is activated on the ground, the airflow in the outer duct is hijacked by the baffle door, and is discharged out of the machine through the grille in reverse. Stress fatigue occurs in the sound-absorbing structure; on the other hand, the high-speed airflow of the deflected engine hits the ground, which may easily cause foreign matter such as sand and gravel to splash and hit the reverse-thrusting metal sound-absorbing structure. Over time, pits and degumming are prone to occur. [0003] Therefore, it is neces...

AI Technical Summary

Problems solved by technology

When the V2500 thrust reverser is activated on the ground, the airflow in the outer duct is hijacked by the baffle door, and is discharged out of the machine through the grille in reverse. Stress fatigue occurs in the sound-absorbing structure; on the other hand, the deflected high-speed airflow of the engine hits the ground, which may easily cause foreign matter such as sand and gravel to splash and hit the reverse-thrust metal sound-absorbing structure. Over time, pits and degumming are likely to occur

[0003] Therefore, it is necessary to re-bond the honeycomb and the skin during repair, and the bonding method in the manual has a poor strength recovery effect, greatly weakens the sound-absorbing effect, and is prone to secondary degumming, so the bonding parts cannot be avoided There is a problem of bonding failure under high temperature and high vibration conditions, so it is urgent to explore a new and reliable bonding process to ensure our process quality

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