When inspecting the NSK thrust ball bearing removed during the regular maintenance and operation of NSK thrust ball bearing equipment and the replacement of peripheral parts, it is necessary to judge whether the parts of secondary NSK thrust ball bearing can be reused and record the good or bad use.
It is also necessary to carefully investigate and record the appearance of the removed NSK thrust ball bearing. In order to find out and investigate the remaining amount of lubricant, clean NSK thrust ball bearing well after sampling.
Secondly, check the raceway surface, rolling surface and mating surface of NSK thrust ball bearing and the wear state of cage for damage and abnormalities, especially observe the running track of raceway surface.
Judge whether the bearing can be used again after considering the degree of bearing damage, machine performance, importance, operating conditions, inspection cycle, etc.
According to the inspection results, if the NSK thrust ball bearing is found to be damaged or abnormal, please find out the causes and formulate countermeasures according to the phenomenon of bearing damage.
In addition, according to the inspection results, if there are the following defects, the NSK thrust ball bearing can no longer be used and needs to be replaced with a new bearing.
a. Any one of the inner and outer rings, rolling elements and cage has cracks and fragments.
b. Any one of the inner and outer rings and rolling elements has peeling.
c. The raceway surface, retaining edge and rolling element are significantly jammed.
d. The cage is seriously worn or the rivets are loose.
e. The raceway surface and rolling element are rusty and scarred.
f. The rolling surface and rolling body have significant indentation and indentation.
g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.
h. Overheated and discolored.
In order to make the surface of Koyo needle roller bearing parts remain large compressive stress after quenching and tempering, carburizing or nitriding Nsk Thrust Ball Bearing atmosphere can be introduced during quenching and heating for short-term surface carburizing or nitriding.
Because the actual carbon content of austenite during quenching and heating of this steel is not high, which is far lower than the equilibrium concentration shown in the phase diagram, it can absorb carbon (or nitrogen). According to different uses, it is necessary to select specially designed bearings with requirements on accuracy,
clearance, cage structure, grease and so on. However, there is no certain order and rules for the selection of bearings. Priority Nsk Thrust Ball Bearing should be given to the conditions, performance and related matters required by Koyo needle roller bearings, especially practical.
In order to make Koyo needle roller bearing give full play and maintain its due performance for a long time, regular maintenance (regular inspection) must be carried out. Through proper regular inspection, it is very important to find faults early and prevent accidents before they happen,
which is very important to improve productivity and economy. Lubrication method: the lubrication method of Koyo needle roller bearing is divided into grease lubrication and oil lubrication. In order to make the bearing function well, first of all, choose the lubrication method suitable for the use conditions and purposes.
If only lubrication is considered, the lubricity of oil lubrication is dominant. However, grease lubrication has the advantage of simplifying the surrounding structure of Koyo needle roller bearing. Compare the advantages and disadvantages of grease lubrication and oil lubrication.
When the original structure in the steel is certain, the carbon content of quenched martensite (i.e. the carbon content of austenite after quenching heating), retained austenite and undissolved carbide mainly depend on the quenching heating temperature and holding time.
With the increase of quenching heating temperature (time is certain), the amount of undissolved carbide in the steel decreases (the carbon content of quenched martensite increases)
When the amount of retained austenite increases, the hardness first increases with the increase of quenching temperature, reaches the peak value, and then decreases with the increase of temperature.
As long as the bearings in order to maintain the original performance as intact as possible, they should be maintained and maintained in front, so as to prevent accidents, ensure the reliability of operation, improve productivity and economy.
Corresponding mechanical operation and maintenance operation standards, regular operation and maintenance conditions. This includes monitoring the operation status, replenishing or changing lubricants, and regular inspection and removal.
As a problem of maintenance operation, the rotation sound, vibration, temperature, lubrication conditions, etc. of Koyo needle roller bearing have been.