INA outer spherical bearing installation precision of the integrated calibration method is practical

INA bearing in the process of installation, bearing deformation is a very realistic situation, the engineers most concerned about is how to accurately control the, if improper manipulation is likely to cause bearing damage. When installation should pay special attention to the matching of the rotating ring is too loose, in order to prevent the eccentric on the vibration, and with the fixed ring not flush clearance, in order to prevent the ring under the load deformation and vibration, such as under the precondition of high speed running, and work under the condition of higher temperature should be here. ( 1) 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, INA bearings used in space ring end face of 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) Fixed end before the installation of the bearings on the shaft to the kerosene used to clean the outer spherical bearing with clean thoroughly clean, for grease lubrication, the first containing 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 ℃, INA bearing load shaft end with the hydraulic press, 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 loading bridge hole heating holes make up 20 ~ 30 ℃, with a continuous gentle pressure of INA bearings - 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. ( 4) Put free end bearing selectively may offset the position of the deviation, after installed on the bearing support position, offset each other as much as possible of roundness error and axiality deviation. Shaft and hole of the roundness and retaining shoulder perpendicularity to request according to the corresponding precision of outer spherical bearing. Should not only precise calculation of rotating ring with the amount of interference, also to accurate calculation of the fixed ring with right quantity. For fixed ring transgressions surplus with a surface of the premise is to match both of us have very high shape accuracy and smaller coarse degree, otherwise installation difficulties and remove more difficult, in addition, also need to consider the influence of the spindle thermal elongation.