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Precision calibration of precision bearings
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| Time：2016.11.09 News Sources：Shandong Xinkaite bearing Co.,Ltd. Views：
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After mounting the angular contact ball bearing on the spindle, the calibration sequence for the mounting accuracy is as follows (for an ordinary lathe with a shaft diameter of 60 100 mm):
(1) measuring the size of the shaft and bearing housing hole to determine the bearing with the precision, with the requirements are as follows:
The inner ring and the shaft to take interference fit, interference 0 ~ +4 m (in light load, high precision when 0); outer ring and the bearing seat to take the gap with the amount of clearance 0 ~ +6 m (but the free end of the bearing The angle between the shaft and the hole surface is less than 2μm, the parallelism of the end face of the cage is less than 2μm, the runout of the inner face of the shoulder is less than 2μm; Bearing block shoulder on the axis of the beating on the axis of 4μm below the front face of the spindle spindle to face the axis of the beating below 4μm.
(2) fixed end of the front bearing in the installation of the shaft
The bearings are cleaned thoroughly with clean kerosene. For grease lubrication, the organic solvent containing 3% to 5% of grease is injected into the bearing for degreasing, then the grease is filled into the bearing by grease gun. Bearing space volume of 10% to 15%); heated bearing so that the temperature 20 ~ 30 ℃, with oil pressure bearing will be loaded into the shaft; will be tight set on the shaft and the appropriate pressure to bear the bearing end to axial (Even if the bearing is correct, but due to the deformation of the cage or cage, the preload also has a spring load on the bearing outer ring, with the measured starting torque method to check the provisions of the preload whether there is a significant change The possibility of change).
(3) Install the bearing shaft assembly into the seat hole
Heating the seat hole to raise the temperature of 20 to 30 DEG C, with a continuous gentle pressure bearing assembly into the seat hole; adjust the front cover, so that the front cover of the tightening amount of 0.02 ~ 0.05μm, bearing the outer end of the benchmark , The dial gauge head against the journal surface, the shaft rotation measurement of its beating, the required error of 10μm or less; the micrometer positioning on the shaft, the table head against the rear hole surface, the shaft rotation to Measure the concentricity of the front and rear seats of the housing.
(4) The free-end bearing is selectively placed in a position where it is possible to offset the deviation and mounted to the bearing support position, offsetting the circularity deviation and the concentricity deviation with each other as much as possible.
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