Angular contact ball bearing limit speed problem and the nature of the noise

If selected TIMKEN bearing speed limit speed cannot satisfy the use requirement, can use some improved technology measures to improve, to achieve a satisfactory requirements. Such as increasing bearing tolerance level; Appropriate increase of clearance. Use special materials and the structure of the improved cage; Change the lubrication method, such as lubrication oil and gas, oil mist and spray; Improve the cooling condition, etc. ( 1) Bearing raceway groove sound sound and its control method is when the angular contact ball bearing operation, the roller rolling on the surface of the raceway and a line of continuous sound, is unique to occur in all rolling bearings of the basic sound. General bearing ring raceway is combined with other sounds. Ball bearing raceway is irregular, frequency above 1000 hz, its main frequency does not change with speed, but its total sound pressure level increases with speed to speed up. Raceway big TIMKEN bearings, the rolling sound of sound pressure level decrease with the increase of the viscosity; The raceway small bearings, the sound pressure level in the viscosity increases to about 20 was/s above, from decreased to increase somewhat. And the rigidity of the bearing, the greater the raceway of the lower the total sound pressure level. Such as radial clearance is too small, the total sound pressure level and race master frequency will increase sharply with the decrease of radial clearance. Control of raceway acoustic methods are: using low noise bearing is bearing waviness is very small, that is, carefully select and use conditions. Race often affect the mechanical noise, reduce the raceway can reduce the mechanical noise. ( 2) Impact of the rolling element and its control method for larger models of ball bearings or cylindrical roller bearings under pure radial load speed, due to centrifugal force is lesser, roller in the rolling body will impact the load area or race and making noises. But with the increase of rotational speed, the noise will disappear. Control method of rolling body impact sound: decrease the radial clearance, materials for use with reasonable structure and flexibility of the bearing cage. ( 3) Rolling mill bearing of rolling mill and its control method is angular contact ball bearings in the harsh metal can occur in all occasions, mostly happens in large type bearing grease lubrication, and in the base oil performance degradation occurred more often in the grease, almost does not occur when oil lubrication. In addition, more easily occur during the winter, when under pure radial load, the radial clearance prone to big occasions, and with different size, easy to happen in a certain speed range, both continuous and intermittent. External ring raceway take special processing method can prevent the occurrence of roll ring, can choose this kind of bearing, if necessary or appropriate to reduce the TIMKEN bearing radial clearance, the use of high performance grease and improve to suit the bearing parts of rigidity. Therefore, only investigate bearing damage, the real reason is hard to come by injury. However, the use of machinery, if you know the bearing conditions of use, bearing the surrounding structure, to get hold of before and after the accident, combined with several damage status and causes of bearing, can prevent the similar accident happen again. Determine outer spherical bearing can use again, according to the damage degree of angular contact ball bearing, mechanical properties, importance, and operating conditions, the factors related to inspection cycle to decide. But check if found any of the following defects, the bearing can't continue to use, need to replace new bearing. ( a) Inner ring and outer ring, rolling body, any has a crack or breach in a cage. ( b) A: do you have any ring, rolling body fracture. ( c) Rolling surface, guard, has obvious scratches on rolling element. ( d) Cage wear obviously, obviously loose or rivet. ( e) On the raceway surface, rolling body is rust or scar. ( f) On the raceway surface, rolling body has serious indentation or bruised. ( g) Inner ring diameter or outer diameter surface has obvious creep. ( h) Obvious color change due to overheating. ( i) The angular contact ball bearing grease sealed, sealing ring or dust cover seriously damaged.