How to improve the installation precision of SKF bearing?

Want to prolong the service life of SKF bearing, installation is the steps shall not be ignored, how to provide installation accuracy will directly influence the service life of SKF bearing, so, before the installation of bearings, must first determine the installation accuracy, bearing and then can not find method to improve. ( 1) Measurement axis and SKF bearing hole size to determine the matching precision of SKF bearing, cooperate with the requirements as follows: the inner ring and shaft adopt interference fit, interference of 0 ~ + 4 microns ( At light load, high precision of 0) ; Outer ring with SKF 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, SKF bearing the face of baffle used parallelism in under 2 microns, shaft shoulder end foreign face beat in under 2 microns; SKF bearing axis hole block shoulder to beat under 4 microns; Spindle axis inside the front cover end face beat under 4 microns. ( 2) SKF bearing before the fixed end of the shaft installation: 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 quantitative grease oil gun will fill in the SKF bearing ( Accounts for 10% ~ 15%) of SKF bearing space volume ; Make up 20 ~ 30 ℃ heating SKF bearing, bearing load shaft end with the hydraulic press, Will set casing pressure on the shaft and with appropriate pressure against SKF 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 SKF bearing is correct, but due to cooperate or cage, the deformation of the preload is also has the potential to change) 。 ( 3) Will import SKF bearing - Shaft assembly into the hole: heating holes make up 20 ~ 30 ℃, with a continuous gentle pressure of SKF bearing - Shaft assembly into a hole; Adjust the front cover, make the front cover of fastening is 0. 02 ~ 0. 5 microns to SKF 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 the SKF bearing hole of the alignment. ( 4) The free end SKF bearing selectively on 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 coaxial degree of deviation. SKF bearing after installed in the host, such as measurement of SKF bearing spindle radial runout, can be found that the each measured value of a 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 SKF bearing spindle, speed will speed gradually rise to close to work, to implement 'break-in' role of SKF bearing, can improve the circulation of the spindle rotation accuracy. SKF bearings after installation, in order to check whether installed correctly, check for running. Small mechanical can rotate with the hand, to confirm whether to rotate smoothly. Check project has caused by foreign bodies, scars, creasing seized up, due to bad installation, installation of seat processing bad moment is not stable, because the clearance is too small, installation error, seal friction caused by the torque is too big, and so on. If there is no abnormal can start power operation. Large machinery from manual rotation, so after no-load start immediately cut off the power, machine idle, check whether there is presence of vibration, noise, rotating parts contact, etc. , confirmed after no abnormalities, into power operation. Dynamic operation, from the beginning of the no-load speed, slowly up to the rated operating conditions. Test run to check the items, whether there is abnormal sound, SKF bearing temperature, lubricant leakage or discoloration, and so on. If discovery is unusual, should immediately stop, check machine, when it is necessary to remove the bearing inspection. SKF bearing temperature, average according to the external temperature of the bearing. But using the oil hole directly measuring the temperature of the bearing outer ring more accurate. The bearing temperature, starting operation gradually increases, usually 1 ~ 2 hours after the temperature stability. If the bearing installation, the temperature will rise sharply, 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, SKF bearing structure, selection of lubrication method error is also the reason. SKF bearing examination such as the rotation of the sound with a stethoscope, a strong metal noise, such as vision, irregular note that exception. Its reason has poor lubrication, shaft or precision SKF bearing, bearing damage, foreign body intrusion, etc.