Slewing bearing Raceway noise analysis
A. noise and vibration random;
B. vibration frequency of more than 1kHz;
C. regardless of the speed change, noise main frequency is almost unchanged while the sound pressure levels increase with the speed increase;
D. when radial internal clearance increases, sharp increase in the sound pressure level;
E. rigid bearing increases, lower the overall sound pressure levels, even if the speed increased, the overall sound pressure levels also increase is unlikely;
F. lubricant viscosity higher sound pressure levels lower, but for grease lubrication, its viscosity, SOAP shape size can affect the noise values of the fiber.
Rolling road sound source is due to ring the inherent vibration after the load. Due to the rings and rolling elements of nonlinear vibration of elastic contact form system. When lubricating or when machining accuracy is not high stimulation and the inherent vibration of elastic features, passing into the air becomes noise. As we all know, even using the most highly skilled manufacturing technology of machining slewing bearing parts, its surface will always exist with varying degrees of tiny geometric errors, so that between the raceways and rolling elements produce micro-wave excited vibration inherent vibration.
Although SKF bearings Raceway noise is inevitable, however high-precision machining parts surface can be taken, the correct choice of turntable bearings and precise use of SKF bearings make noise damping.
Second, rust-proof maintenance method
1, immersion method: slewing bearings using immersion in antirust oil, so its surface to attach a layer of antirust oil method. Oil film thickness can be controlled through the rust-proof temperature or viscosity of the grease to achieve.
2, brushing method: does not apply for soaking or spraying of slewing bearings or bearings with special shapes, brush both pay attention do not produce rust preventive oil accumulation, should also pay attention to the prevention of missing coating.
3, spray method: some larger bearings cannot take the immersion method oiling, generally use about 0.7Mpa filtered compressed air pressure air spray cleaner places. Spray application of solvent-diluting antirust oil or thin-layer antirust oil, but must have comprehensive fire prevention and protection measures.


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