V2500 engine sliding door tip repair hyperboloid appearance recovery method

Abstract

The invention discloses a V2500 engine sliding door tip repair hyperboloid appearance recovery method, which comprises the following steps of (1) selecting a convex metal ring on the lower side of a V2500 engine sliding door tip as a reference surface, and measuring the distance between the tip and the selected reference surface; (2) the springback value of the tip area is obtained through a test; (3) manufacturing a measuring tool for tip positioning; and (4) after bonding and repairing the damaged area of the tip, heating and curing by adopting a vacuum bag, starting to close the vacuum bag, placing a measuring tool on the lower side of the tip and the upper side of the convex metal ring when the heating procedure is started to reach 95-105 DEG C, applying external force to the cured tip, so that the cured tip is tightly attached to the measuring tool placed on the lower side, and taking out the measuring tool. And continuously monitoring in the subsequent heating and curing process until the curing work is finished, thereby finishing the appearance recovery of the hyperboloid for repairing the tip. The method can prevent the upwarp phenomenon during tip repair, is used for guiding the recovery of the hyperboloid appearance after tip repair, and serves as a construction standard and specification.

Description

technical field [0001] The invention belongs to the technical field of aircraft maintenance, and in particular relates to a method for restoring the shape of a hyperboloid at the tip of a V2500 engine translation door. Background technique [0002] The reverse thrust is designed to reduce the speed of the aircraft and shorten the run distance after the aircraft touches the ground. The most widely used reverse thrust form of modern aircraft is the choke type. After the reverse thrust is opened, the airflow is ejected at a certain reverse angle, and the thrust auxiliary brake is removed. The opening forms are roughly divided into baffle doors and translation doors. The V2500 engine uses the opening method of the translation door, and the translation door is an important part of the reverse thrust. Its reliability is crucial to the normal use of the entire reverse thrust function. [0003] In actual work, the working environment of the thrust reverser is harsh, and it must be...

AI Technical Summary

Problems solved by technology

Since the anti-thrust sliding door of the V2500 engine adopts a metal sound-absorbing structure, which is composed of perforated skin and aluminum metal honeycomb bonding, it is necessary to re-bond the damaged honeycomb and skin during repair. The aerodynamic shape of the curved surface, the tip is at the tilted position at the front end of the translation door. During the bonding and curing process, it must be completed in the vacuum bag, and the vacuum pressure in the vacuum bag will change the curvature of the tip, destroying the original hyperbolic aerodynamic shape and affecting the reflection. Thrust size control, does not meet the safety technical requirements of reverse thrust

However, according to the repair plan corresponding to REPAIR70 METHOD2 in the GOODRICHAEROSTRUCTURES SRM manual, there is no way to adjust the height of the tip tilt and restore the original hyperboloid shape

Since it is difficult to restore the hyperbolic shape quantitatively after maintenance, it is difficult to guarantee the maintenance quality

Images