By heating the NSK bearings or bearing seat, the expansion will be a tight fit into installation method matched by heat. It is a common and installation method of labor. This method is suitable for a large amount of surplus of angular contact ball bearing installation, hot charging before the bearing or separable bearing rings into the tank and uniform heating temperature of 80-100 ℃, and then removed from the oil as soon as possible to shaft, in order to prevent the cooling inner end face and shoulder joint is not tight, the bearing cooling can be axial fastening.
The bearing outer ring and light metal bearing seat is tightly matched with heating, bearing the hot charging method, can avoid the mating surface is. Oil tank heating bearings, in the distance at a distance of a mesh, or using a hook hanging bearing, bearing can′t be put in a box bottom, to prevent the heavy impurities into the bearing or uneven heating, the tank must have a thermometer, strictly control the temperature should not exceed 100 ℃, in order to prevent the occurrence of tempering effect, make the ring hardness decreased.
1 lathe bearing rigidity problems such as the plug iron loose, transmission disequilibrium caused by vibration. Of course, lathe bearing installation instability will cause vibration, the vibration caused by the surface roughness of the workpiece is reduced.
2 bearing rigidity problems caused by vibration so as far as possible, use coarse knife rod, extension length reduced angular contact ball bearings; lack of rigidity of workpiece will cause vibration, the application frame in turning slender shaft, or with a clip of a top instead of the two top clamping.
3 bearing its geometry parameters is not correct according to the cutting angle cutting characteristics, reasonable selection of appropriate of the workpiece material, the surface roughness decreases.
4 because of the built-up edge, the workpiece surface roughness decreased bue very firmly, cutting the bue participation, make the surface bearing workpiece llama or a designated groove mark phenomenon, turning angular contact ball bearing should be avoided when the. Combined with analysis of the above reasons, should accomplish early know early prevention processing, to the problem nipped in the bud, improve the NSK bearing precision, meet the design requirements.
Rolling bearing life in revolutions (or speed of work under a certain number of hours), definition: bearing within this life, should any of its bearing ring or a rolling body occurred on the initial fatigue damage (spalling or defect). However, whether in the laboratory or in actual use, can be clearly seen in the same working conditions, the appearance of the same angular contact ball bearing, the actual life is not the same. In addition to several different definitions of bearings "life", one of the so-called "working life", it represents the actual life of a bearing can be achieved in the damage before by the wear and tear, damage is usually caused not by fatigue, but caused by wear, corrosion, seal damage and other reasons.
Causes of NSK bearing most of the damaged many -- beyond the original estimate of the load, non effective sealing, tight fit as a result of too small bearing clearance. Any of these factors are factors that have their own special type of damage and will leave the special signs of damage. Therefore, examine damaged bearings, in the majority of cases it may cause can be found, in general, have angular contact ball bearing 1/3 of the damage caused by fatigue damage, and another 1/3 due to poor lubrication, the other 1/3 caused by contaminants from entering the bearing or improperly installed.