Noise caused by improper use of the second: It exists for all kinds of bearings. When the bearing raceway surface or the rolling element surface is bumped, crushed, rusted, there will be a certain period of noise and vibration. When the bearing is in operation When dust invades, it will produce dirt noise. This noise is non-periodic, and it is also accompanied by vibration. The sound is not fixed in size and sometimes not.
The third intrinsic noise: the rolling sound and various bearing and rolling friction sounds are the inherent sounds of the rolling bearing. The rolling sound is generated by the elastic characteristics of the rolling element in contact with the raceway. When the combined bearing rotates, the rolling element is rolling. A continuous and sleek sound from the rolling of the road; abnormal rolling friction sounds can produce an uncomfortable metal friction abnormal sound such as "squeaky, squeaky", and does not emit such a sound when it is well lubricated. Therefore, in general It is not a problem, only attention should be paid after the noise increases.
After the INA bearing is installed in the main machine, if the radial runout of the combined bearing main shaft is measured, it can be found that the measured value of each revolution has a certain change; when the measurement is continuously performed, it can be found that after a certain number of revolutions, the change will occur. Approximately repeated. The index for measuring the degree of change is the cyclic rotation precision, and the change approximately repeats the required number of revolutions to represent the "quasi-period" of the cycle rotation accuracy. The magnitude of the magnitude change in the quasi-period is large, that is, the cycle rotation precision is poor. .
If the bearing spindle is properly preloaded, the speed is gradually increased to near the working speed to implement the "run-in" function of the bearing, which can improve the cycle rotation accuracy of the spindle.
Measure the size of the shaft and the bearing housing hole to determine the matching precision of the combined bearing. The matching requirements are as follows: the inner ring and the shaft adopt an interference fit, and the interference is 0~+4μm (0 in light load and high precision); The clearance between the ring and the bearing housing hole is 0~+6μm (but when the bearing at the free end uses the angular contact ball bearing, the clearance can be increased); the roundness error between the shaft and the seat surface is less than 2μm, and the bearing is used for separation. The parallelism of the end face of the ring is less than 2μm, the outer end face of the shoulder shoulder is less than 2μm; the runout of the bearing seat hole is less than 4μm; the inner end of the front cover of the main shaft has a runout of 4μm or less.
Installation of the fixed-end front bearing on the shaft: Thoroughly clean the INA bearing with clean cleaning kerosene. For grease lubrication, first inject the organic solvent containing 3% to 5% grease into the bearing for degreasing and then use the oil gun. Fill the bearing with a certain amount of grease (10% to 15% of the bearing space volume); heat the combined bearing to raise the temperature by 20 to 30 °C, load the bearing into the shaft end with a hydraulic press; press the adapter sleeve on the shaft and With the appropriate pressure against the bearing end face for axial positioning; the spring balance tape is wound on the outer ring of the bearing, and the method of measuring the starting torque is used to verify whether the specified preload has changed greatly (even if the bearing is correct, However, due to the deformation of the fit or the cage, the preload may also change.
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