F & Z for regular maintenance bearing equipment, replacement parts and peripherals during operation is removed when the bearing inspection, required in order to determine whether the bearing parts can be used again and record usage of good and bad. Should carefully investigate and record split down the bearing and appearance of the situation. In order to understand and investigate the remaining amount of lubricant, after sampling, to be a good wash bearings.
Second, check the status of F & Z bearing raceway, the rolling surface and the mating surface of the wear and maintain the status frame for damage and abnormal situations, such as in particular, to observe the raceway running track. Can be used again to determine the bearing to come back at a later decision to consider the extent of bearing damage, machine performance, the importance of operating conditions, inspection cycle.
Test results, if found bearing damage and abnormal situation, identify the reasons for the phenomenon of bearing damage and develop countermeasures. In addition, test results, if there are several flaws in the following words, the bearing can not be used again, the need to replace the new bearings.
a. inner and outer rings, rolling elements, cage and any one of them cracks appear debris.
b. inner and outer rings, rolling any one has peeled.
c. raceway, ribs, rolling a significant injury card.
d. keep badly worn or loose rivets cage powerful.
e. raceway, rolling rust and have scars.
f. raceway, and playing a significant indentation marks on the rolling elements.
g. There creep on the inner or outer surface of the inner diameter of the outer diameter.
h. overheat discoloration powerful.
i.grease sealed bearings seals and shields to serious damage
Raceway sound source is generated by the ring after the natural vibration loads due. Because the elastic contact rings and rolling elements constituting nonlinear vibration systems. When lubrication or machining accuracy is not high when it will stimulate the natural vibration characteristics associated with this elastic, passing into the air then becomes noise. As we all know, even with the highest levels of contemporary manufacturing techniques bearing parts, tiny geometric surface error of their work will always exist varying degrees, so that the produce between raceways and rolling elements tiny fluctuations in the natural vibration excitation vibration system.
Although F & Z bearing raceway noise is inevitable, however, can take high-precision machining parts work surface, the correct selection of bearings and precision bearings make use of noise damping.
Raceway sound is due to rotation of the rolling element bearing raceways and rolling in a smooth and stimulate continuous noise, the level or tone when aroused great attention only when. In fact, inspired by the sound of the raceway sound energy is limited, such as in normal circumstances, the quality of sound is 6203 bearing raceway 25 ~ 27dB. This noise to bear radial load single row deep groove ball bearings for the most typical, it has the following characteristics:
. a noise and vibration is random;
. b vibration frequencies above 1kHz;
. c irrespective of speed changes, the noise is almost constant and dominant frequency sound pressure level is increased with the speed increase;
. d When the radial clearance increases, the sound pressure level increased dramatically;
.e Bearing rigidity increases, the lower the overall sound pressure level, even if the speed increases, the total sound pressure level has increased little;
.f The higher the viscosity of the lubricant, the lower the SPL, but for grease lubrication, its viscosity, soap fibers can affect the shape and size of the noise level.