Method for detecting processing defects of high-nitrogen and corrosion-resistant steel bearing part

Abstract

The invention discloses a method for detecting processing defects of a high-nitrogen and corrosion-resistant steel bearing part and relates to the technical field of bearing defect detection. The defects of the high-nitrogen and corrosion-resistant steel bearing part in the thermal treatment and grinding processing process can be rapidly and accurately displayed through steps including degreasing,hot water cleaning, flowing cold water blanching, etching, second flowing cold water blanching, first brightening, third flowing cold water blanching, second brightening, fourth flowing cold water blanching, neutralization, fifth flowing cold water blanching, rust prevention and the like, the etched high-nitrogen and corrosion-resistant steel bearing part has uniformly corroded surface and does not rust, the normal color is uniform gray, a grinding burn has gray black or black strip shape, blade shape or dot shape, the interface is comparatively remarkable and has a certain direction, namely,mostly the processing direction; the carbon depletion position has gray white spots and the like. The method has been applied to production processing, bearing failure caused by processing quality defects is avoided, the service life and the safety performance of a bearing are guaranteed, economic loss and the like are reduced, and the method is suitable for large-range popularization and application.

Description

technical field [0001] The invention relates to the technical field of bearing defect detection, in particular to a method for detecting processing defects of high-nitrogen corrosion-resistant steel bearing parts. Background technique [0002] It is known that if the bearing parts have defects such as depletion of carbon, soft spots, burns, grinding cracks, etc., they are prone to fatigue, shedding or fragmentation during operation, thereby affecting the service life and safety of the entire bearing. According to the type and use of bearings, the materials of domestic bearing parts are generally selected from general bearing steel and special steel (such as high temperature bearing steel Cr4Mo4V, carburizing steel Cr2Ni2Mo, stainless steel 9Cr18, etc.). Due to the difference in material composition and corrosion resistance of bearing parts, different cold pickling formulas and process methods are used to show the depletion of carbon, soft spots and grinding caused by heat tr...

AI Technical Summary

Problems solved by technology

At present, there is no relevant detection method in China that can quickly and accurately display the processing defects of bearing parts of this material at the same time, so it is necessary to invent a new detection method and etching solution to quickly and accurately display high nitrogen corrosion-resistant steel (40Cr15Mo2VN ) to control the surface processing defects of bearing parts, monitor the processing quality of bearing parts, and ensure the service life and safety performance of finished bearings, etc.