Whether the outer packaging is clear: Under normal circumstances, it has own special designer to design the outer packaging, and arrange the production conditions of the factory to produce the production, so the packaging is very clear from the line to the color block vague.
Whether the steel printing is clear: the brand name and label will be printed on the bearing body. The font is very small, but most of the products produced by the factory use steel stamping technology, and they are pressed before the heat treatment. Therefore, although the font is small, it is concave-deep and very clear. The fonts of counterfeit products are not only vague, because of the rough printing technology, the fonts float on the surface, and some can even be easily erased by hand.
Is there any noise: Hold the bearing body sleeve in the left hand, and turn the jacket to rotate in the right hand, and listen for the noise. Due to the backward production conditions of most counterfeit products, completely manual workshop operation, it is inevitable that sand-type impurities will be mixed into the bearing body during the production process, so it will make a noise when rotating. This is the biggest difference from a genuine factory brand that strictly enforces production standards and operates on machines.
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Whether there are muddy oil marks on the surface: this should be paid special attention when buying FAG bearings. Since the current anti-rust technology in China is not particularly home, it is easy to leave thick oil marks on the bearing body when it is anti-rust treated, and it is sticky-thick in the hand, and it is almost seen on the foreign original FAG bearings Less traces of anti-rust oil, but the attentive expert said that FAG bearings smelled, there must be anti-rust oil, but just can not see it.
Whether the chamfer is uniform: the so-called chamfer of the bearing, that is, the intersection of the horizontal and vertical surfaces, due to the production technology limitations, counterfeit bearings are not handled well at these corners.
The vibration caused by the deviation in the manufacturing process, the smaller the deviation, the smaller the vibration. The roundness, waviness and surface roughness of the surface of the steel ball are the factors that have the greatest impact on the vibration of each FAG bearing component, followed by the shape error and surface roughness of the inner and outer ring channels, and again the cleanliness and lubrication of the bearing Agent quality, etc.
Operating conditions such as installation conditions, speed, direction of load received in the axial direction, magnitude, etc.
Bearing fatigue failure is a surface form of failure, which is mainly manifested by the initiation, expansion and fracture of fatigue cracks, and the long-term effects of load failures produced under alternating metals. The cracks are in two ways:
First: From the surface, this is the external load caused by the periodic changes of the contact stress on the working surface due to the plastic deformation on the working surface and the strain hardening surface of the FAG bearing during rolling contact, and finally developed from the small crack The inner surface, the formation of surface cracks between the two, due to the introduction of lubricant on the working surface, the opening force, severely hit the wall, forcing the crack to move forward;
Second: From the surface layer, under repeated pressure, the contact of the surface initially generates cracks at a certain depth in the place where the surface is exposed, and the angle along the surface direction to a certain depth, from the surface behind the contact surface, and Go beyond the surface and eventually form an erosion peel, leaving a horse pit.