Installation of bearing parts allowed to have a certain temperature, when the hand touch body shell, should not feel hot as normal, whereas indicates NTN bearing temperature is too high.
Double row deep groove ball bearing temperature are: the cause of lubricating oil quality does not conform to the requirements or metamorphism, lubricating oil viscosity is too high;
The assemble tight (
Inadequate clearance)
;
One-way bearing assembly too tight;
Bearing race in internal rotation shaft or housing;
Too much load;
Bearing cage or rolling body fracture, etc.
Rolling bearings to remove check, according to the damage judgment of NTN bearing double row deep groove ball bearing fault and damage.
The so-called pressure constant is the use of helical spring pretightening, disc spring, give appropriate preparation method of the bearing.
When use, even though the bearing changing the relative position, loading method in advance.
When use bearing what type of seal?
, it will even the change of relative position, preload can maintain.
Frequency above 1000 hz, its main frequency does not change with speed, but its total sound pressure level increases with speed to speed up.
NTN bearing raceway sound great, the raceway of sound pressure level decrease with the increase of the viscosity;
The raceway small bearings, the sound pressure level in the viscosity increases to about 20 was/s above, from decreased to increase somewhat.
Most of the bearing smoke bad for many reasons -
—
Than previously estimated load, the effective sealing, with the tight is too small, as a result of NTN bearing clearance, etc.
Any of these factors factors there is its special damage forms and will leave a special signs of deterioration.
Therefore, examine the damage to the double row deep groove ball bearings, in most cases can find its possible causes, generally speaking, a third of the bearing damage resulting from the fatigue damage, a third of the other resulting from poor lubrication, a third of the other resulting from pollutants into the bearing improper handling or installation.
After the NTN bearing installation, in order to check whether installed correctly, check for running.
Small mechanical can rotate with the hand, to confirm whether to rotate smoothly.
Check project has caused by foreign bodies, scars, creasing seized up, due to bad installation, installation of seat processing bad moment is not stable, because the clearance is too small, installation error, seal friction caused by the torque is too big, and so on.
If there is no abnormal can start power operation.
Large machinery from manual rotation, so after no-load start immediately cut off the power, machine idle, check whether there is presence of vibration, noise, rotating parts contact, etc. , confirmed after no abnormalities, into power operation.
Dynamic operation, from the beginning of the no-load speed, slowly up to the rated operating conditions.
Test run to check the items, whether there is abnormal sound, double row deep groove ball bearing temperature, lubricant leakage or discoloration, and so on.
If discovery is unusual, should immediately stop, check machine, when it is necessary to remove the bearing inspection.
NTN bearing temperature, average according to the external temperature of the bearing.
But using the oil hole directly measuring the temperature of the bearing outer ring more accurate.
The bearing temperature, starting operation gradually increases, usually 1 ~ 2 hours after the temperature stability.
If double row deep groove ball bearings to install, the temperature will rise sharply, abnormal high temperature.
The reason such as lubricant, bearing clearance is too small, too much bad installation, excessive friction sealing device, etc.
High-speed rotation, the choice of the ways of bearing structure, the lubrication error and so on is also the reason.
NTN bearing examination such as the rotation of the sound with a stethoscope, a strong metal noise, such as vision, irregular note that exception.
Its reason has poor lubrication, shaft or precision bearing, double row deep groove ball bearing damage, foreign body intrusion, etc.
