A large number of tests at home and abroad have shown that the processing quality of cages, ferrules and steel balls has different degrees of influence on bearing vibration. The processing quality of steel balls has the most obvious influence on bearing vibration, followed by the processing quality of ferrules, the most important influence. The factors are the roundness, waviness, surface roughness, surface flaws of the steel ball and the ferrule.
The most prominent problems of China's steel ball products are large dispersion of vibration values and serious surface defects (single points, group points, pits, etc.), although the surface roughness, size, shape, and error are not lower than the level of the circle, but the set The rear bearing has high vibration value and even produces abnormal sound. The main problem is that the waviness is not controlled (no standard, no suitable test and analysis instrument), and the machine tool has poor vibration resistance. There are problems with the grinding wheel, grinding disc, coolant and process parameters. On the other hand, it is necessary to improve the management level and avoid any occasional quality problems such as bruises, scratches and burns.
For the ferrule, the most serious vibration of the bearing is the channel waviness and surface roughness. For example, when the circularity of the inner and outer channels of small and medium-sized deep groove ball bearings is greater than 2μm, the bearing vibration will be significantly affected. When the internal and external channel waviness is greater than 0.7μm, the bearing vibration value increases with the increase of the waviness, and the channel is seriously injured. The vibration can be increased by more than 4dB, and even abnormal sounds can occur.
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