INA composite bearing noise impact on running accuracy

First noise associated with bearing manufacturing: here including aircraft noise and tremolo, adhere to the main attack aircraft noise in ball bearings and tapered roller bearings, as composite bearing rotates due to adhere to the vibration of the frame and frame and roller impact makes a noise. The sound is cyclical. Tremolo ( All kinds of bearing) There is a certain frequency of sound, it is because of the raceway surface waviness of provoked vibration. This phenomenon is the most common problem, we later demand of can. In particular, we are learning some INA bearings of learning of students, to seriously look at these key content, may have so some assistance to you. The second use undeserved provoked noise: about various bearing all exist. When the rolling bearing raceway appearance or table in vitro was bruised, pit, rust, then you will have certain periodic noise and vibration. When bearing in operation will produce contamination noise have dust intrusion. This noise is cyclical, also with vibration, its sound size is not fixed, sometimes no. Inherent noise: the third race with all kinds of bearings and rolling friction is rolling bearing inherent noise, raceway is by the elastic properties of the rolling element and raceway contact, when combined bearing rotating roller rolling over on the rolling path of a continuous and a sophisticated sound; Abnormal sound of rolling friction can be issued a 'tickle, tickle' uncomfortable metal friction abnormal sound, smooth and good, won't make such a sound. So in normal condition is not a problem, as long as the noise increased after must pay attention to. INA bearings in the host device, after the end of such as measurement of composite bearing spindle radial runout, can be found that the each measured value of a certain change; Stop continuous measurement, can be found that after a certain number of revolution, this change will appear again and again. Weigh the level of the change of index for cyclic rotation accuracy, change approximately turn over and over again to present the required on behalf of the rotating precision of the loop 'cycle', the value of the amplitude changed in quasi cycle, is the cycle rotation accuracy is poor. Such as the proper preload bearing spindle, the speed increased to nearly work speed, on bearing the 'break-in' role, to be able to progress the cycle of spindle rotation accuracy. The size of the measurement of shaft and bearing hole, to sure combination with precision bearings, cooperate with the request as follows: inner ring and the shaft to interference fit, 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 in the home side bearings using angular contact ball bearings, also 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. Fixed end bearing on the shaft device: before will stop INA bearings with a clean wash kerosene thoroughly clean, about fat is smooth, smooth to contain 3% ~ 5% fat organic solvent degreasing cleaning before injection bearing, oil gun to quantitative smooth again fat bearing inner ( Accounts for 10% ~ 15%) of the bearing space volume ； Heating composite bearing made up of 20 ~ 30 ℃, bearing load shaft end with the hydraulic press, 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, rule by measurement of starting torque check is the preload can have substantial changes ( Even if the bearing is correct, but due to cooperate or frame deformation, load also has the potential to change) 。