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Under normal circumstances, the filling amount of grease in NSK bearing always exceeds the actual demand for direct lubrication. It is on the holder and in the cavity of the bearing cover, and forms a contour on the periphery of the rolling element.
During this process, the bearing temperature rises rapidly due to the resistance of excess grease. Although most of the excess grease is squeezed out at the initial stage of operation, and the grease squeezed in the accessories of the raceway may still be brought into the raceway by the rotating rolling element.
In the initial stage of the bearing, most of the grease is quickly squeezed out of the raceway (less than one minute), and the Nsk Bearing Grease accumulated grease is discharged in a small amount while circulating with the rotating body of the bearing.
At this time, the bearing Wendu continues to rise until all the excess bearing grease is Nsk Bearing Grease discharged, which can be called the running in stage of grease. According to the quality and filling amount of grease in the bearing structure, this period may last for more than ten minutes or even several hours.
After the remaining bearing grease is completely discharged, the remaining small amount of grease forms a thin layer of grease film on the mutual contact surface of rolling element, raceway and cage through the action of wedge, so as to enter the normal stage of bearing.
At this time, the temperature Nsk Bearing Grease gradually decreases and reaches equilibrium. In other words, the long-term lubrication mainly depends on this layer of grease film.
In addition, it also plays a role in the long-term operation of the lubricating oil inlet and outlet part of the rolling frame, and it also plays a role in the long-term Nsk Bearing Grease operation of the lubricating oil inlet and outlet part of the rolling frame.
The contour must be formed. It is quite draft, the running in time is short, and the bearing temperature is low and stable in long-term Nsk Bearing Grease operation. This is an ideal grease, so it is particularly important for the channelization of the grease.
Some so-called vortex type greases are not the case. They are not easy to form a contour. Even if the contour is formed, they are easy to collapse. At this time, the excess grease returning to the raceway repeatedly is in the condition of forced mixing for a long time.
The bearing torque is large, the temperature is high, and it is Nsk Bearing Grease unbalanced. It may also produce noise, and the grease is easy to deteriorate and lose.
Treatment of NSK bearing temperature rise
When the bearing temperature rises, first judge whether there is misoperation. If it does rise, the following treatment shall be carried out:
(1). Check whether the cooling water pressure, water flow and pipeline system are normal. If the water pressure is low, the filter may be blocked and cannot be handled in time, it can be shut down for treatment. When it is confirmed that it can work, it can be put into use.
(2). Check the oil pressure of the Nsk Bearing Grease governor. If the oil pressure is low, the cooling water hydraulic valve may be closed.
(3). Check whether the bearing has abnormal sound, NSK bearing and check whether the bearing swing is abnormal.
(4). Take an oil sample to observe whether the oil color has changed, and 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 gauge is normal. If not, Nsk Bearing Grease check whether the oil drain valve of the oil tank is tightly closed. If it has been closed tightly, oil shall be added. If it is oil leakage from the sealant pad, it shall be shut down for treatment.
When we use NSK Bearings, if we find that the temperature is very high, we should stop the operation of the equipment quickly, find out the cause, and deal with it according to the solutions provided above.
However, the solutions may be different due to the different Nsk Bearing Grease causes of bearing heating, so we should treat it according to the specific circumstances and complete it with the help of technicians.