SKF bearing the cautions of preventive maintenance

Of SKF bearing equipment preventive maintenance, operation and peripheral parts replacement was removed when making an inspection, bearing need to judge whether the bearing parts can be used again in turn and record the usage of good or bad. Carefully investigate and record the bearing and the appearance of being removed. In order to explore the residual amount of investigation and lubricant, after sampling, to clean the bearing well. Second check SKF bearing raceway surface, rolling surface and cooperate with the surface condition and wear conditions of cage with and without damage to watch the race and abnormal situation especially the running track. Judge bearing can use again, to the extent of the damage in considering bearing, machine performance, importance, and operation conditions, such as inspection period to decide later. Test results, if found damage and bearing abnormal situation, please according to the bearing damage phenomenon to find out the reason, to develop countermeasures. In addition, the test results, there are some defects, if the bearing can't use, need to replace new bearing. 一个。 Inner and outer ring, rolling body, to keep any of them are cracks and debris. b。 Inner and outer ring, rolling body any one strip. c。 Raceway surface, guard, significant injury of roller. d。 Maintains a badly worn or loose rivet badly. e. Raceway surface, rust and roller has a scar. f。 Had a remarkable indentation rolling surface, rolling body and make a mark. g。 Inner ring diameter or outer diameter on the creep. h。 Discoloration of overheating. 我。 Sealed bearing grease sealing and dust cover breakage to serious. Raceway acoustic source lies in the inherent vibration caused by ring after exposure to the load. Because of the ring and rolling body elastic contact nonlinear vibration system. When lubrication or the machining accuracy is not high will stimulate the related to the elastic characteristics of natural vibration and passed to the was noise in the air. As is known to all, even if is to use the contemporary most advanced manufacturing technology and processing the bearing parts, there will always be the working surface of varying degrees of tiny geometric error, thus make the raceway and rolling body produces slight fluctuations inherent vibration excitation vibration system. Although the SKF bearing raceway noise is inevitable, but can take work surface precision machining parts, the correct selection of bearing and precise use of bearing noise vibration reduction. Race is due to the rolling element bearing rotates in raceway rolling and inspire a smooth and continuous noise, only when the sound pressure level or tone great concern. Actually raceway sparked by the sound of sound energy is limited, such as in normal circumstances, quality of 6203 bearing raceway is 25 ~ 27 db. This noise to bear radial load of single row deep groove ball bearing is the most typical, it has the following characteristics: a. Randomness of noise and vibration; b。 The vibration frequency above 1 KHZ; c。 No matter how the speed of change, the main frequency noise almost unchanged while the sound pressure level increase with the increase of rotational speed; d。 When the radial clearance increases, the sound pressure level increased dramatically; e. Bearing stiffness increases, the lower the total sound pressure level, even if the speed increases, the total sound pressure level increases; f。 Lubricant viscosity is higher, the lower the sound pressure level, but for grease lubrication, the viscosity, the shape of soap fiber size can influence the noise value.