How to improve the installation of IKO bearing accuracy to avoid failure

In the imported bearing industry, this kind of grease are the biggest, accounts for about 70% of the total in fat mass. Because this kind of grease to choose soft, easy to filter the fibres lithium soap thickeners, the use of mineral oil as base oil, it is easy to meet the requirements of low-standard bearing to reduce the vibration value. Another advantage is good pumping, whether mechanical fatliquoring, or manual besmear fat, is easy. Moreover, the lower the price of the grease, bearing the cost can be greatly reduced. First need to stress is that it is important to keep the IKO bearing lubrication and clean. So when we inspect the bearing before, should first clean the surface of bearing, and then remove the perimeter of the bearing parts. Everyone should pay attention to, oil seal is very fragile parts, this in the check and need to be careful, when disassembling do not excessive force, so as not to cause damage to parts. And careful check of the bearing oil seal and its surrounding parts, if has presented the adverse symptoms, be sure to replace, and bad seal will cause damage to the bearing cloud caused by abnormal equipment downtime. Second, we will also examine IKO bearing lubricant. Lubrication is very important, not just for bearing, also for all of the bearing. But please note that the bearing should not add too much grease. Check of bearing lubricant method is: with little lubricant in friction between two fingers, and if the presence of pollutants, can be felt; Or in the back of a thin layer of lubricant, then seal of inspection. And then replace the bearing lubricant. Use after xie used engine oil, engine oil lubrication bearing if possible, should be impregnated with fresh oil and let the machine in low speed rotation for a few minutes. As far as possible make the oil collecting residual pollutants, and then purging in addition to the oil. Note: the oil before use it's best to filter it. And the use of grease lubrication bearing in replacing grease, Joe used in addition to the device should be avoided with any part of the joint Angle of cotton into the bearing. Because these residues fiber may wedged in between the scroll and damage, especially the application of small bearing more need to pay attention to this problem. Want to prolong the service life of IKO bearing, installation is the steps shall not be ignored, how to provide installation accuracy will directly influence the service life of bearing, so, before the installation of bearings, must first determine the installation accuracy, bearing and then can not find method to improve. ( 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, 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) Fixed end IKO bearings on the shaft before installation: will the kerosene used to clean the 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 ℃, 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. ( 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. Bearing in the host after the installation, such as measuring IKO bearing spindle radial runout, can find its each turn of measuring value has 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 IKO bearing 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.