INA oilless bearing method - bearing knowledge using process problem
INA bearings allow running noise slightly in the work, if you have any abnormal noise or excessive noise or sound, indicates oilless bearing failure.
Cause noise of rolling bearings is more complex, one is the bearing inner and outer surface wear.
Due to the wear and tear, damage to the bearings and shell, bearing and shaft cooperate relationship, lead to axis deviation from the correct position, when axis at high speed movement produces sound.
When the bearing fatigue, its surface metal flake, also can produce sound make bearing radial clearance increases.
In addition, INA bearing lubrication, dry friction, and bearing broken etc all make abnormal noise.
Without oil bearing wear loose after kuang, maintains a looseness damage, also can produce sound.
When institutions, installation of bearing parts allowed to have a certain temperature, when the hand touch body shell, should not feel hot as normal, conversely indicates that bearing temperature is too high.
Quality does not conform to the requirements or metamorphism of lubricating oil, lubricating oil viscosity is too high;
The assemble tight (
INA bearing assembly too tight;
Without oil bearing race in internal rotation shaft or housing;
Too much load;
Bearing cage or rolling body fracture, etc.
From peeling, indentation, rust, crack and wear will be reflected in the INA bearing vibration measurement, bearing vibration damage of bearing is very sensitive, so, through the use of special oil-free bearing vibration tester (
Frequency analyzer, etc. )
Can measure the size of the vibration, through frequency points cannot deduce the abnormal situation.
Due to the measured values of bearing or sensor installation position and different using conditions, thus requiring prior to each machine is analyzed by the measured value of the determined after judgment standard.
As INA bearing even with slight stripping damage, also an exception and irregular, and therefore with the sound of the measuring device can distinguish, USES the sound device, oil-free bearings in operation to check the size of the rolling sound and quality, have the effect of prevention in advance.
If using the oil hole can directly measure temperature of bearing outer ring, is more appropriate.
In general, INA bearing temperature, average according to the bearing on the surface of the outdoor temperature can be predicted.
If the appropriate lubrication, installation department, the bearing temperature will rise sharply, appear unusually high temperature, must stop at this moment, take the necessary precautions.
Usually, the temperature of the bearing with operation began to slowly rise, 1 -
After 2 hours to reach steady state.
The normal temperature of bearing for machine heat capacity, heat dissipating capacity, rotational speed and load.
When necessary, the use of thermal device can monitor at any time without oil bearing operating temperature, and implement e. automatic alarm when the temperature is more than the household or stop to prevent the shaft accidents.