Nuclear island main equipment part chromium coating grinding method

Abstract

The invention relates to the technical field of processing methods for nuclear island main equipment parts, and discloses a method for grinding the chrome-plated layer of nuclear island main equipment parts, which includes the following steps: (1) chrome-plating the surface to be plated; Dimensional inspection of the parts as required to determine the coating thickness; (3) Grinding of the coating of parts that pass the inspection; (4) Dimensional inspection of chrome-plated parts as required; (5) PT for the coating of parts that pass the dimensional inspection Inspection; (6) Polish and polish the coating of parts that fail the PT inspection; (7) Perform PT inspection on the polished coating; (8) Conduct dimension inspection on parts that pass the PT inspection; Repeat steps (6) and (7) for unqualified parts until the PT inspection is qualified, and then proceed to step (8) after the PT inspection is qualified. The invention improves the pass rate of PT inspection and solves the problem of low pass rate of PT inspection after the chrome plating layer of the main equipment parts of the nuclear island is ground.

Description

technical field [0001] The invention relates to the technical field of processing methods for nuclear island main equipment parts, in particular to a method for grinding a chrome-plated layer of nuclear island main equipment parts. Background technique [0002] Some parts of the main equipment of the nuclear island are under high temperature and high pressure conditions. In order to ensure the service life of such parts, hard chrome is plated on the surface that needs to be wear-resistant. Compared with other non-nuclear industries' requirements for chromium plating inspection, the main equipment of nuclear island puts forward higher requirements for the inspection of chrome plating layer. It requires coloring penetrant inspection (referred to as "PT inspection") for chrome plating layer, which is not available in other industries It is required to carry out dyeing penetrant inspection on the chrome plating layer, and the acceptance criterion is that no red display can appea...

AI Technical Summary

Problems solved by technology

When grinding the chrome-plated layer, if the selected grinding wheel does not match the performance of the chrome-plated layer, or the grinding depth is not reasonable enough, the surface roughness of the coated layer after grinding does not meet the specified requirements, and vibration patterns may even appear in some parts of the coated layer surface. It will affect the entire electroplating surface, and a red display will appear during the subsequent PT inspection, which will cause the PT inspection to fail

When polishing the parts with display, if the polishing method is unreasonable, cracks will occur in some areas due to excessive polishing, and in severe cases, the coating will fall off