The methods of improving the precision for installation precision bearing

1. Improve the precision of method of bearing in the host after the installation, such as the measurement of spindle radial runout, can be found that the measured values of each turn has certain change; Continuous measurement, can be found that after a certain number of revolution, this change will approximately duplicated. Measure for cyclic rotation accuracy degree of the change, change the approximately duplicated the revolution, on behalf of cyclic rotation accuracy 'cycle', the value of the amplitude changed in quasi cycle, is the cycle rotation accuracy is poor. Such as the proper preload on the spindle, the higher speed step by step to near work speed, on bearing the 'break-in' effect, can improve the circulation of the spindle rotation accuracy. 2. The comprehensive check method of fitting accuracy after angular contact ball bearing in the spindle, installation precision calibration sequence is as follows ( Trunnion as 60 - 100 mm engine lathe as an example) :( 1) Measuring the size of the shaft and bearing hole, to determine with precision of the bearing, cooperate with the requirements as follows, inner ring and the shaft to interference fit, 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, ( 2) The installation of fixed end front bearing on the shaft. Will the kerosene used to clean the bearing with clean thoroughly clean, for grease lubrication, to contain 3% ~ 5% of organic solvent injection bearing grease for degreasing, cleaning and oil gun will fill in the bearing grease quantitative ( Accounts for 10% ~ 15%) of the bearing space volume ； Heat bearing the heat up 20 ~ 30 ℃, using hydraulic press the bearing into 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) 。 ( 3) The bearing - Shaft assembly into the hole. Heating holes make up 20 ~ 30 ℃, with a continuous gentle pressure of bearing - Shaft assembly into a hole; Adjust the front cover, make the front cover of fastening is 0. 02 ~ 0. 5 microns to bearing outer end face as a benchmark, the dial gauge meter resistance on shaft neck surface, will beat measuring the rotation axis, request error under 10 microns; Will be located on the shaft, dial gauge meter resistance in the back seat hole surface, the axis of rotation to measure before and after bearing hole of the alignment. A: on the precision of the rolling bearing level next article: bearing surface treatment technology