Increasing accuracy of NTN angular contact ball bearing running four attention point

The accuracy of angular contact ball bearing is not too high, is there any way to improve? The precision of the rolling bearing can be improved, the following is the most commonly used rolling bearing of the four methods for increasing accuracy of bearing. Number 1, and the effects of the rolling load of, when a bearing radial load, the load of rolling amount will be a slight change of operation, including: 2 - 3 - 2 - 3. 。 。 。 This caused the load in the direction of migration. The resulting vibration is inevitable, but it can be loaded in advance, in order to reduce all roller axial loading. 2, the local damage in operation, the rolling across the damage of bearing parts will produce a particular vibration frequency. Frequency analysis can find out the damage of bearing parts. This principle has been used to condition monitoring equipment, to detect the situation of the bearing damage. The temperature will rise sharply, the 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, NTN bearing structure, selection of lubrication method error is also the reason. 3, the accuracy of the relevant part of the shaft and the relationship between the NTN bearing, under the condition of close contact with the bearing ring, can be compatible with the shape of the adjacent parts deformation. If there is distortion in the operation may cause vibration. Therefore, bearing and shaft processing requirements of the tolerance is very important. 4, pollutants if you run in the pollution of the environment, impurities may enter the NTN bearing rolling. Vibration depends on the number of contaminants in the rolling, the size and composition, although frequency does not produce the typical form, its reason is poor lubrication, shaft or precision bearing, bearing damage, foreign bodies, such as intrusion, but you can hear the sound of a kind of annoying. Measuring the size of the shaft and bearing hole, to determine with precision of the bearing, cooperate with requirements as follows: take the interference fit, inner ring on the shaft interference was 0 ~ + 4 microns ( At light load, high precision of 0) ; Outer ring and bearing hole clearance fit, the interval 0 ~ + 6 microns ( But on the free end bearing with angular contact ball bearing, still can increase the clearance) ; Shaft and hole surface roundness error in under 2 microns, bearing the face of baffle used parallelism in under 2 microns, shaft shoulder end foreign face beat in under 2 microns; Axis bearing hole block shoulder to beat under 4 microns; Spindle axis inside the front cover end face beat under 4 microns. Fixed end before the installation of the bearings on the shaft, bearing with clean to clean a thorough cleaning of kerosene, the grease lubrication, to contain 3% ~ 5% of organic solvent injection bearing grease for degreasing, cleaning and quantitative grease oil gun will fill in the bearing inner ( Accounts for 10% ~ 15%) of the bearing space volume ; Heat bearing the heat up 20 ~ 30 ℃, the angular contact ball bearing with hydraulic press into the shaft end; Will set casing pressure on the shaft and with appropriate pressure against bearing face makes its axial positioning; The lace will spring balance volume on the bearing outer ring, use the method of measuring start torque check is the preload of the regulation for substantial changes ( Even if the bearing is correct, but due to cooperate or cage, the deformation of the preload is also has the potential to change) 。