Here are a few common ways to identify the quality of a […]
Here are a few common ways to identify the quality of a bearing:
First, whether there is turbid oil on the surface
Since the current domestic anti-rust technology is not particularly good at home, it is easy to leave a thick oil trace when the bearing body is rust-proofed. It is very sticky on the hand, and the bearings imported from foreign countries are hardly visible. Traces of anti-rust oil, but particularly careful experts say that the imported bearings smell a smell, it must be under the anti-rust oil, just can't see it. This should be especially noted when purchasing imported bearings.
Second, whether the steel printing is clear
Brand letters, labels, etc. will be printed on the bearing body. The font is very small, but most of the products produced by the factory use the stamping technology, and the type is pressed before the heat treatment, so the font is small, but the recess is deep and very clear. The fonts of counterfeit products are rather vague. Due to the rough printing technology, the fonts float on the surface, and some can even be erased by hand.
Third, whether the outer packaging is clear
Under normal circumstances, the factory brand has its own special designer to design the external packaging, and arrange the production conditions of the factory to produce, so the packaging is very clear from the line to the color block, unambiguous. (There are also unique designs on the accessories packaging of some imported brands to protect their intellectual property).
Fourth, is there any noise?
Hold the inner sleeve of the bearing with your left hand and turn the outer sleeve with your right hand to make it rotate to hear if it has noise. Since most of the counterfeit products are out of production conditions and completely hand-worked, it is inevitable that impurities such as sand will be incorporated into the bearing body during the production process, so that noise will be generated when rotating. This is the biggest difference between a factory brand that strictly enforces production standards and operates with machines.
5. Is the chamfer even?
The so-called chamfering of the bearing, that is, the intersection of the horizontal surface and the vertical surface, the counterfeit bearing is unsatisfactory in the processing of these corners due to the limitation of production technology.