en.Wedoany.com Reported - In modern precision manufacturing, a single testing method is insufficient to meet the high reliability requirements of bearings. Chinese bearing manufacturing enterprises have built a full-process quality assurance system, from raw materials to finished products, by combining techniques such as acid pickling, magnetic particle inspection, and dye penetrant inspection.

The first line of defense targets raw materials and blanks. Hot acid pickling with 50% hydrochloric acid is used to detect macrostructure defects such as shrinkage cavities and porosity; after forging, magnetic particle inspection is employed to identify surface defects like folds and cracks, preventing defective products from flowing into subsequent processes.

The second line of defense focuses on post-heat treatment inspection. Cold acid pickling can quickly reveal decarburized layers and soft spots, while hot acid pickling clearly displays quenching cracks. After heat treatment, rings and rollers must undergo 100% magnetic particle inspection to capture fine cracks.

The third line of defense is final product inspection and in-service diagnosis. Magnetic particle inspection on finished products is used to detect fatigue cracks, while dye penetrant inspection is suitable for non-ferromagnetic materials or large rings, ensuring no blind spots in testing. Acid pickling focuses on structural defects, while magnetic particle and dye penetrant inspections target structural discontinuities. The synergy of these three methods enhances the quality control level of bearings.

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