Question 1: what are the main factors of SKF Bearing Vibration?
Answer 1: SKF Bearing Vibration mainly comes from two sources:
First, the natural vibration of SKF Bearing caused by external excitation of SKF shaft refers to the natural Source vibration of inner ring, outer ring, rolling element and cage of SKF Bearing
The second is the forced vibration caused by the mutual contact and collision of moving parts, including the forced vibration caused by the Source fact that the rolling element is not an ideal sphere, the motion track of the contact point of the inner and outer channels is not an ideal circle (roundness and waviness),
the rolling surface is not an ideal smooth surface (roughness), the collision between the rolling element and the cage in motion and the Source impurities in the lubricant, Vibration and sound are closely related.
it is recommended to concentrate limited human and financial resources to control the vibration of SKF Source bearings. It is not appropriate to establish a separate quality standard for noise. Of course, according to foreign experience, for special products,
such as SKF bearings in computer hard disk drive system and video recorder optical disk drive system, it is not convenient to use vibration Source assessment, noise measurement method standards can be formulated for assessment.
Generally, the temperature of fag bearing can be inferred from the temperature outside the bearing Source chamber. It is more appropriate if the oil hole can be used to directly measure the outer ring temperature of fag inlet bearing.
Generally, the temperature of fag bearing starts to rise slowly with the operation of the bearing, and reaches a stable state after 1-2 hours. The normal temperature of the bearing varies with the heat capacity, heat dissipation, speed and load of the machine. If the lubrication and installation parts are appropriate,
the bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken.
The thermal sensor can monitor the working temperature of fag bearing at any time, and automatically alarm or stop when the temperature exceeds the specified value to prevent the occurrence of combustion shaft accident.
High temperatures are also harmful to bearing lubricants. Sometimes bearing overheating can be attributed to the lubricant of the bearing. If the temperature of fag bearing exceeds 125 ℃ for a long time, the bearing life can be reduced.
The causes of high temperature fag bearings include insufficient or excessive lubrication and lubricant. It contains impurities, excessive load, bearing ring damage, insufficient clearance, high friction caused by oil seal, etc.
Therefore, it is necessary to continuously monitor the temperature of fag bearing, whether measuring the bearing itself or other important parts. If the operating conditions remain unchanged, any temperature change can indicate that a fault has occurred.
The regular measurement of fag bearing temperature can be aided by a thermometer, such as a digital thermometer, which can accurately measure the bearing temperature and display it in degrees Celsius or Fahrenheit.
Important fag bearing means that when it is damaged, it will cause equipment shutdown. Therefore, this kind of bearing should be equipped with temperature detector. Normally, FAG bearings will have a natural temperature rise after just lubrication or re lubrication and last for one to two days.
Generally, the bearing with operating temperature above 150 ° is called high temperature bearing. When the operating temperature of chromium bearing steel exceeds 150 °, its hardness will drop sharply and its size will be unstable, so that fag bearing can not work normally.
Therefore, for fag bearings operating at 150 ° to 350 ° operating temperature, if the ferrule and rolling element are still made of ordinary high carbon chromium bearing steel, special tempering treatment must be carried out for fag bearing parts, which shall generally be tempered at 50 ° higher than the operating temperature.
The bearing steel tempered according to the above requirements can be used normally at working temperature. However, due to the decrease of hardness after tempering, the service life of fag bearing is reduced.