Bearing checks bearing regular maintenance of equipment, operation and peripheral replacement parts are dismantled, the need to turn to judge the good in the bad times bearing parts can be used again and record usage. Also carefully investigate and record split down the bearing and appearance. In order to understand and the remaining amount of the lubricant of Inquiry, the sampling should be well cleaned click bearings.
Second, check the condition of the bearing raceway and the rolling surface and the mating surface and cage wear state for damage and abnormal situation, in particular to observe raceway running track. Judgment bearings could be used again, and decided to come back to after considering the extent of bearing damage, machine performance, the importance of operating conditions, check cycle.
The loaded spindle bearing, the installed accuracy check the following order (shaft diameter 60-100mm conventional lathe, for example):
(1) measurement of the size of the shaft and the bearing hole to determine with precision bearings, with the following requirements: take the inner ring and the shaft interference fit, the amount of interference 0 ~ +4 μm (at light load, high-precision 0) ; outer ring and bearing hole to take clearance fit, clearance volume 0 ~~ +6 μm (but free end bearings angular contact ball bearings, can also increase the gap); surface of shaft and housing bore roundness error of less than 2μm, bearing parallel to the end face of the spacer in the 2μm or less, the shaft shoulder faces the external end of the beating of 2μm or less; the bearing hole stopper shoulder to the axis of the beating in a 4μm following; the the spindle front cover the inner side facing the axis of the beating in the following 4μm.
(2) fixed end bearing shaft installation: organic solvent into the bearing clean clean kerosene thoroughly cleaned, greased, the first containing 3% to 5% of the grease in the bearings for degreasing and cleaning, and then oil gun would fill in the bearing grease quantitative (accounting for 10% to 15% of the bearing space volume); heating bearings so that the temperature rise from 20 to 30 ℃, oil press bearing onto the shaft; tight sets against the shaft appropriate pressure up against the end bearings axially positioned; spring scale tape volumes in the bearing outer ring, measuring starting torque check under preload whether substantial changes (even if the bearings are correct possible), but due to the fitting or deformation of the holder, the pre-load also changes.
(3) will be loaded into the housing bore bearings - shaft body: heated seat hole temperature 20 to 30 ℃ consecutive playful pressure bearing - shaft body into the seat hole; adjust the front cover, the front cover fastening 0.02 to 0.05μm chock end as the base will contravene the dial gauge head of the table to the journal surface, the axis of rotation to measure their beating, the error is less than 10μm; dial indicator is positioned on the shaft, header contradict the back seat of the inner surface of the bore, the axis of rotation to measure the bearing bore concentricity of the front and rear seat.
(4) the free end bearing selectively on the deviation of the position may be offset by, mounted to the bearing housing supporting position after the offset as much as possible between the roundness and concentricity deviation.



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