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Bimetal Bearing Exhibit Late Fault Characteristics
Oct 24, 2017

bimetal bearing exhibit late fault characteristics
The manufacture of oil-free bimetal bearing is popular through forging, heat treatment, turning, grinding and assembly. The rationality of the processing technology, advanced, stability will also affect the bearing life. The heat treatment and grinding processes that affect the quality of the bearing are often more directly related to the failure of the bearing. In recent years, the work of the bearing surface transformation layer of the study shows that the grinding process and the bearing surface quality is closely related.
bimetal bearing show late fault characteristics to serious failures (usually bearing damage such as shaft, burn, sand spalling, raceway, bead wear, etc.) most of the time not more than a week, the greater the capacity of the equipment, the faster the speed , The shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault characteristics, should be judged to determine the failure of composite bearings, as soon as possible arrangements for maintenance.
After a period of movement, vibration and noise to maintain a certain level, the spectrum is very simple, only one or two times the frequency. Rarely appear more than three times the frequency spectrum, composite bearing state is very stable, into a stable working period. Continue to run into the late use, bearing vibration and noise began to increase, sometimes abnormal sound, but the vibration changes more slowly, this time, the bearing kurtosis value began to reach a certain value. We believe that this time the performance of bimetal bearing for the initial failure. bimetal bearing show late fault characteristics to serious failures (usually bearing damage such as shaft, burn, sand spalling, raceway, bead wear, etc.) most of the time not more than a week, the greater the capacity of the equipment, the faster the speed , The shorter the interval. Therefore, in the actual bearing fault diagnosis, once the late fault characteristics, should be judged to determine the failure of composite bearings, as soon as possible arrangements for maintenance.
After a period of movement, vibration and noise to maintain a certain level, the spectrum is very simple, only one or two times the frequency. Rarely appear more than three times the frequency spectrum, composite bearing state is very stable, into a stable working period. Continue to run into the late use, bearing vibration and noise began to increase, sometimes abnormal sound, but the vibration changes more slowly, this time, the bearing kurtosis value began to reach a certain value. We believe that this time the performance of bimetal bearing for the initial failure.
The limit of the contact angle of the bimetal bearing is 120 °. When the bimetal bearing wears into this contact angle, the liquid lubrication is destroyed. So no longer affect the conditions of bimetal bearing under the premise of the contact angle is smaller as possible. From the theoretical analysis of the friction force, when the contact angle is 60 °, the friction torque is the smallest. Therefore, it is suggested that the bimetal bearing with the rotation angle higher than 500r / min has a contact angle of 60 ° and a bimetal bearing, contact angle can be used 90 °, can also be used 60 °.
bimetal bearing can also be lubricated with grease, in the choice of grease should consider the following points:
(1) bearing load, low speed, you should choose a small penetration of grease, and vice versa to choose the cone into the degree of large. High-speed bearings used to tap the degree of small, good mechanical stability of the grease. It is important to note that the viscosity of the base oil of the grease is lower.
(2) the choice of grease drops generally higher than the operating temperature of 20-30 ℃, continuous operation in the case of high temperature, pay attention not to exceed the allowable use of grease temperature range.
(3) bimetal bearing in the water or humid environment work, should choose good water resistance of calcium, aluminum or lithium grease.
(4) use a good adhesion of the grease.

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