Method for removing fluorescent liquid in aero-engine compressor casing

Abstract

The invention discloses a method for removing fluorescent liquid in an aero-engine compressor casing. The method is used for carrying out fluorescent flaw detection on blades of the 3-7-stage compressor casing and cleaning away penetrating liquid. Cold air and a water vapor spraying gun are adopted for purging a blade installation groove in the upper end face of the 4-7-stage part of the compressor casing and a stopping block installation site in the 3-stage part of the compressor casing so that the penetrating liquid can flow out from a casing gap or the other stopping block installation site; hot water is adopted for cleaning in winter, redundant penetrating liquid on the surface is cleaned away, and to prevent excessive cleaning, only the water vapor spraying gun and hot water can be adopted for cleaning rather than cold air is directly adopted for purging; the casing is placed in a developing tank for development after being dried. Post-cleaning is carried out on the casing after a flaw detection result shows that the casing is up to standard, and because a small amount of penetrating liquid which does not influence flaw detection quality remains in the gap, cleaning after flaw detection is necessary. The casing is placed in the hot water to be soaked, compressed air and the water vapor spraying gun are adopted for purging the blade installation groove in the upper end face of the 4-7-stage part of the compressor casing and the stopping block installation site in the 3-stage part of the compressor casing till no penetrating liquid flows out of the gap, and the casing is dried through a fan or an oven. By means of the method, the cost is lowered, the production cycle is shortened, and the production quality is improved.

Description

technical field [0001] The invention relates to a technology for removing fluorescent flaw detection liquid during engine maintenance, in particular to a method for removing fluorescent liquid in an air compressor case. technical background [0002] The structure of the aero-engine compressor casing is complicated. During the overhaul inspection, since the aero-engine compressor casing is used for fluorescent flaw detection without disassembling the blades, when the fluorescent flaw detection fluid is soaked, the fluorescent liquid is released from the blades and the casing shell. The gaps formed by the combination and the holes of the casing itself enter the inner cavity of the casing. The existing cleaning technology is to soak and rinse the appearance. The existing cleaning method is surface flushing, and surface cleaning can only remove the permeate on the surface, but the permeate in the cavity cannot be completely removed, which will easily cause serious contamination ...

AI Technical Summary

Problems solved by technology

The existing cleaning method is appearance washing, and appearance cleaning can only clean the penetrant on the surface, but the penetrant in the cavity cannot be completely removed, which will easily cause serious contamination of the imaging agent and affect the sensitivity of flaw detection

Due to unclean penetrant removal, the imaging agent is seriously polluted, which affects the sensitivity of flaw detection; during assembly, it is often found that there is fluorescent penetrant leaching from the pores of the casing, which pollutes the surface of the casing, resulting in unqualified appearance quality