A method for cleaning the flow passage holes of engine bearing case parts

Abstract

The invention belongs to the fields of manufacturing and processing of aviation products, and particularly relates to a method for cleaning runner holes of a bearing casing part of an engine. The method comprises the following steps: firstly, evenly mixing cream materials A and B taking organic silicon organic resin as a matrix according to the volume ratio of 5 to (3-3.5), so as to form mixed cream; dividing the mixed cream into ball-shaped sealing materials of which the diameters are smaller than or equal to 2mm; evenly sealing the runner holes in the inner diameter surface of a bushing of the bearing casing, placing the bearing casing part in air for 10-20 minutes, and naturally solidifying the runner holes; lathing the inner diameter surface of the bushing of the bearing casing; blowing compressed air to the runner holes after lathing; blowing the sealing materials out of the runner holes until no foreign materials such as impurities are blown out so that the runner holes are cleaned. By adoption of the method for cleaning the runner holes disclosed by the invention, the problems of corrosion and uncleanliness of the runner holes of the engine part are successfully solved; the qualification rate of the part is 100%.

Description

Technical field [0001] The invention belongs to the field of aviation product manufacturing and processing, and in particular relates to a method for cleaning the flow passage holes of engine bearing casing parts. Background technique [0002] The bearing casing of the engine has two sets of eccentric inner hole surfaces after the single-piece supporting body parts and bushings are thermally assembled. The general design requires that the surface profile is not greater than 0.127, which cannot be guaranteed after thermal assembly. Therefore, it needs to be machined after assembly, and there are several small diameter holes on the inner diameter surface of the machined bushing that lead to the flow channel. The turning iron chips can easily enter the flow channel, and this flow channel It is required that the total weight of impurities in the cleanliness test after cleaning does not exceed 3 mg, and the largest particle does not exceed 0.1 mm. It is necessary to prevent foreign ob...

AI Technical Summary

Problems solved by technology

[0002] The bearing casing of the engine has two sets of eccentric inner hole surfaces after the single-piece supporting main part and the bushing are thermally assembled, and the general design requires that the surface profile is not greater than 0.127, which cannot be guaranteed after thermal assembly. Therefore, it needs to be machined after assembly, and there are several small holes leading to the flow channel on the surface of the inner diameter of the bush processed by turning, and the iron filings processed by turning can easily enter the flow channel. It is required that the total weight of impurities in the cleanliness test after cleaning should not exceed 3 mg, and the largest particle should not exceed 0.1 mm. It is necessary to prevent foreign matter such as iron filings from entering the internal flow channel. When the engine is working, the iron filings in the oil circuit will affect the performance of the engine. Normal operation, even cause engine failure

At present, the method of sealing wax is generally used to block the holes, but because the wax is difficult to clean, the surface of the parts is corroded, and the cleanliness of the parts is not qualified, which seriously affects the development of other parts of the engine.

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