Technological method for repairing rear shaft of high-pressure turbine

Abstract

The invention discloses a technological method for repairing a rear shaft of a high-pressure turbine. The technological method comprises the following steps that S1, a chemical method is adopted for removing a grate tooth coating of the rear shaft of the high-pressure turbine; S2, the rear shaft of the high-pressure turbine is clamped by a fixture special and ground for the first time; S3, the edge between the matching surface of a bearing of the rear shaft of the high-pressure turbine and an oil unloading groove is ground to eliminate sharp edges; S4, sand blowing and chromium plating are conducted on the matching surface of the bearing of the rear shaft of the high-pressure turbine; S5, the rear shaft of the high-pressure turbine is clamped through the special fixture and ground for thesecond time; after grinding, the size of the matching surface of the bearing of the rear shaft of high-pressure turbine is measured to be qualified by using a digital-display inner diameter three-jawmicrometer, and it is guaranteed that the ellipse degree of the matching surface of the bearing of the rear shaft of the high-pressure turbine is within 0.008 mm; and S6, plasma flame spraying is conducted on sealed teeth in the rear shaft of the high-pressure turbine. According to the technological method, the faults that the size abrasion of the matching surface of the bearing of the rear shaftof the high-pressure turbine is too serious, and the ellipse degree of the matching surface of the bearing of the rear shaft of the high-pressure turbine is poor are successfully solved.

Description

technical field [0001] The invention relates to the technical field of aero-engines, and in particular provides a maintenance method for the rear shaft of a high-pressure turbine. Background technique [0002] The high-pressure turbine rear shaft is an important part of the high-pressure turbine rotor, and the size and ovality of its bearing mating surface are important parameters. During the maintenance process, nearly 100% of the high-pressure turbine rear axle bearing mating surface wear out of tolerance and the high-pressure turbine rear axle bearing mating surface ellipticity out-of-tolerance failures were nearly 100%. At present, there is no stable process for repairing out-of-tolerance wear of the fitting surface of the high-pressure turbine rear axle bearing and out-of-tolerance maintenance of the ovality of the fitting surface of the high-pressure turbine rear axle bearing. When the surface ovality is out of tolerance, the qualified high-pressure turbine rear shaft...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-pressure turbine rear axle maintenance process, which solves the problems of high-pressure turbine rear axle bearing mating surface size wear out of tolerance and high-pressure turbine rear axle bearing mating surface ellipticity out-of-tolerance problems, and realizes high-pressure turbine rear axle repairability performance, cost savings

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