How to identify bearing quality problems

Update:28-05-2018
Summary:

1. Whether the outer package is clear: Under normal cir […]

1. Whether the outer package is clear: Under normal circumstances, the positive factory brand has its own specialized designer who designs the outer packaging, and arranges the production conditions to pass the production and production of the factory. Therefore, the packaging is very clear from the line to the color. unambiguous.
2. Whether the stenciled characters are clear: The branded characters, labels, etc. will be printed on the bearing body. The fonts are very small, but most of the products produced by the factory are stamped, and they are pressed before the heat treatment. Therefore, although the font is small, it is concave and deep and very clear. The fonts of counterfeit products are not only blurred, but due to the rough printing technology, the fonts float to the surface, and some of them can even be erased by hand easily.
3, whether there is noise: the left hand holding the bearing body sleeve, the right hand toggle the jacket to make it rotate, listen to whether there is a noise. Since most of the counterfeit products have backward production conditions and are completely hand-worked, it is unavoidable that impurities such as sand, sand, and impurities will be trapped in the bearing during the production process. Therefore, noises will be emitted when rotating. This is the biggest difference from a genuine factory brand that strictly enforces production standards and operates with machines.
4. Whether the surface has cloudy traces of oil: This should pay special attention when purchasing imported bearings. As the current domestic rust-proof technology is not yet at home, it is easy to leave a thick oil trace on the bearing body when it is subjected to rust-proof treatment. It is sticky and sticky in the hand, and the foreign imported bearings are almost invisible. To the traces of anti-rust oil, it was particularly careful that experts say the imported bearings smelled like a taste, it must be under the anti-rust oil, but can not see it.
5, whether the chamfer is uniform: the so-called chamfering of the bearing, that is, the intersection of the lateral surface and the vertical surface, counterfeit bearings due to the limitations of production technology, in these corners of the corner of the site is not satisfactory.