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Invisible bearing defects and two lines of quality protection in production
2026-04-17
For bearing manufacturing managers and manufacturing engineers, the most dangerous "invisible killers" on the production line are inclusions in raw materials, heat treatment cracks, and grinding marks that cannot be detected by the naked eye. If these defects go undetected and reach the market, they will not only lead to premature bearing failure, but will also cause huge claims and damage to the brand's reputation. To avoid these pitfalls, two main lines of defense must be firmly established in the manufacturing process: post-etch inspection and non-destructive defect inspection. The first line of defense: etching is the “developer” of the quality of heat treatment and grinding. The main value of etching is to use the principle of chemical corrosion to visually reveal processing defects hidden beneath the surface of the metal. In bearing manufacturing, the cold etching process is commonly used for rapid sampling to detect decarburization and soft spots caused by heat treatment and hardening after turning, as well as burns and cracks formed during grinding. The standardized pickling process flow usually includes such strict steps as "degreasing → cold running water rinsing → pickling → cold running water rinsing → rinsing in Minghua solution (twice) → neutralization → rust proofing." During actual operation, quality control personnel must strictly control the parts, for example, the parts must constantly move up and down in the solution of each bath to ensure uniform reaction.
