Imported bearing check the method of anti noise - bearing knowledge
To examine the bearing on a regular basis, it is important to be in the best condition to maintain the bearing work, can also be found the problem.
About bearing matters that should be paid attention in use and related knowledge.
First of all, we have to stress is that it is important to keep the imported bearing lubrication and clean.
So when we inspect the bearing before, should first clean the surface of bearing, and then remove the perimeter of the bearing parts.
Everyone should pay attention to, oil seal is very fragile parts, so in check and need to be careful, when disassembling do not excessive force, so as not to cause damage to parts.
And careful check of the bearing oil seal and its surrounding parts, if has presented the adverse symptoms, be sure to replace, and bad seal will cause the damage of the bearing, the bearing cloud caused by abnormal equipment downtime.
Second, we need to check the bearing lubricant.
Lubrication is very important, not just for imported bearings, also for all bearings.
But please note that the bearing should not add too much grease.
Check of bearing lubricant method is: with little lubricant in friction between two fingers, and if the presence of pollutants, can be felt;
Or in the back of a thin layer of lubricant, then seal of inspection.
And then replace the bearing lubricant.
The import of used engine oil lubrication bearing after xie used engine oil, if possible, shall be impregnated with fresh oil and let the machine in low speed rotation for a few minutes.
As far as possible make the oil collecting residual pollutants, and then purging in addition to the oil.
Note: the oil before use it's best to filter it.
And the use of grease lubrication bearing in replacing grease, Joe used in addition to the device should be avoided with any part of the joint Angle of cotton into the bearing.
Because these residues fiber may wedged in between the scroll and damage, especially the application of small bearing more need to pay attention to this problem.
Bearing raceway groove sound sound and its control method is when imported bearing operation, the roller rolling on the surface of the raceway and a line of continuous sound, is unique to occur in all rolling bearings of the basic sound.
General bearing ring raceway is combined with other sounds.
Ball bearing raceway is irregular, frequency above 1000 hz, its main frequency does not change with speed, but its total sound pressure level increases with speed to speed up.
Raceway large bearings, the rolling sound 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.
And the rigidity of the bearing, the greater the raceway of the lower the total sound pressure level.
Such as radial clearance is too small, the total sound pressure level and race master frequency will increase sharply with the decrease of radial clearance.
Rolling along the acoustic method is: low noise of imported bearing is bearing waviness is very small, that is, carefully select and use conditions.
Race often affect the mechanical noise, reduce the raceway can reduce the mechanical noise.
Impact of the rolling element and its control method for larger models of ball bearings or cylindrical roller bearings under pure radial load speed, due to centrifugal force is lesser, roller in the rolling body will impact the load area or race and making noises.
But with the increase of rotational speed, the noise will disappear.
Control method of rolling body impact sound: decrease the radial clearance, materials for use with reasonable structure and flexibility of the bearing cage.
Rolling mill bearing of rolling mill and its control method is cylindrical roller bearing in the harsh metal can occur in all occasions, mostly happens in large type bearing grease lubrication, and in the base oil performance degradation occurred more often in the grease, almost does not occur when oil lubrication.
In addition, more easily occur during the winter, when under pure radial load, the radial clearance prone to big occasions, and with different size, easy to happen in a certain speed range, both continuous and intermittent.
External ring raceway take special processing method can prevent the occurrence of roll ring, can choose this kind of bearing, if necessary or appropriate to reduce import bearing radial clearance, the use of high performance grease and improve to suit the bearing parts of rigidity.