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Several methods of failure treatment of cylindrical roller bearings

wallpapers Tech 2021-01-19
According to the formation mechanism of the degraded layer on the working surface of the bearing, the main factors affecting the degraded layer are the effects of grinding heat and grinding force. Let's analyze the reasons for the failure of cylindrical roller bearings.
The main purpose of preload
The main purpose of preload and representative examples can be cited by some examples to prove and understand:
(1) While accurately determining the position of the shaft in the radial direction and the axial direction, it suppresses the runout of the shaft.
(2) Improve the rigidity of bearings. Bearings for the main shaft of machine tools, and bearings for the pinion gears of the bicycle differential mechanism.
(3) Prevent axial vibration and abnormal noise caused by resonance. Bearings for small motors.
For cylindrical roller bearings bearing combined loads, due to the increase in the number of rolling elements bearing the load, the friction resistance increases, the fever increases, the lubrication and cooling conditions deteriorate, and the force acting on the cage also increases, so, Must be adjusted according to the  bearing type and the size of the load angle, the limit speed of the bearing is multiplied by a reduction factor f2.
 
If the limit speed of the selected cylindrical roller bearing cannot meet the application requirements, some improvement techniques can be used to make progress to meet the requirements. Such as increasing the bearing tolerance difference; appropriately increasing the clearance; using special materials and improving the structure of the holding frame; changing the lubrication method, such as using oil and gas, oil mist and jet lubrication; improving cooling conditions, etc.
In the process of using  bearings, the temperature rise is easy to occur.
When the temperature of the cylindrical roller bearing rises, the first judge whether it is misoperation. If it does rise, do the following treatment
 
 (1) Check whether the cooling water pressure, water flow and piping system are normal. If the water pressure is low, it may be that the filter is clogged. If it cannot be processed in time, it can be stopped for processing. When it is confirmed that it can work, it can be put into use.
 (2) Check the oil pressure of the governor. If the oil pressure is low, it may cause the cooling water hydraulic valve to close.
 (3) Check whether the  bearing has abnormal noise, and check whether the swing of the cylindrical roller bearing is abnormal.
 (4) Take an oil sample to observe whether there is any change in the oil color, and conduct a laboratory test to see whether it has deteriorated. If the deterioration is confirmed, stop the machine and replace it with new oil.
 (5) Check whether the oil level of the oil level is normal. If it is abnormal, check whether the oil tank drain valve is closed tightly. If it is closed tightly, the oil should be refilled; if the sealing rubber gasket is leaking oil, stop the machine for processing.

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Tag: methods   treatment   failure   Several   Roller   cylindrical