Below to introduce several common methods to identify bearing quality:
1, the surface is turbid oil
As the current domestic anti-rust technology is not particularly home, so the bearing body rust treatment is easy to leave thick traces of oil in your hand is very thick, and imported bearings imported almost barely visible Antirust oil traces, it touches particularly careful experts say there is a smell of imported bearings, it is certainly anti-rust oil, but can not see it。 This should pay special attention to the purchase of imported bearings.
2, whether the lettering is clear
In the bearing body will be printed on the brand words, labels and so on. The fonts are very small, but most of the products produced by the factory use stamping technology, and are pressed before being heat treated。 Therefore, the font size is small but deep and very clear。 The counterfeit fonts faint, due to rough printing technology, fonts floating on the surface, and some can even be easily erased by hand.
3, the packaging is clear
Under normal circumstances, are the factory brand has its own dedicated designer to design the packaging, and arrange the production conditions of the factory for production, so the packaging from the line to the color block are very clear and unambiguous。 (Part of the imported bearings brand packaging accessories also have a special design to protect their intellectual property).
4, whether there is noise
Hold the bearing body sleeve with your left hand, turn the coat with your right hand to make it rotate, and listen for any noise. Since most of the counterfeit products have poor production conditions and completely hand-operated workshops, it is inevitable that impurities such as sand will be mixed in the production process and hidden in the bearing body, so the noise will be spun during rotation. This is the biggest difference between a manufacturer's brand and a machine manufacturer that strictly enforces production standards.
5, chamfer is even
The so-called bearing chamfer, that is, the intersection of the cross-section and the vertical, fake bearings due to production technology limitations in these parts of the corner of the corner to deal with unsatisfactory.