Due to the repeated load, cracks are first formed in the parts with weak strength at a certain depth under the surface. Then it develops to the contact surface, so that the surface metal is recorded in pieces, so that the bearing can not work normally. This phenomenon is called fatigue spalling. After bearing load, the rolling bearing produces plastic deformation at the contact between rolling element and raceway. When the load is too heavy, plastic deformation pits will be formed on the surface of the raceway, resulting in severe vibration and noise during the operation of the joint bearing.
Due to the relative movement of the rolling element and the raceway and the invasion of dirt and dust, the surfaces of the rolling element and the raceway are worn. When the wear is large, the clearance, noise and vibration of the joint bearing increase, which reduces the operation accuracy of the bearing, which directly affects the accuracy of some main engines. Because for some bearings used in precision machinery, the service life of articulated bearings can be limited by the amount of wear.
Low friction coefficient, suitable for high speed, the limit speed is close to the deep groove ball bearing. The processing requirements for the shaft or seat hole are high. After the bearing is installed, the relative deflection of the outer ring axis shall be strictly controlled to avoid contact stress concentration. If there are bumps, burrs, rust spots or solid particles (such as wear debris, sand and soil) on the assembly surface of the shaft and seat hole, it will not only make the bearing installation difficult and the installation position incorrect, but also the solid particles will play the role of grinding if they fall into the joint bearing, and the working surface of Tangshan bearing will be abraded or scratched when the bearing rotates,
Therefore, it must be carefully checked before installation. If the above defects are found, they should be corrected. For example, use an oil file to remove burrs, raised bumps and rust spots, and polish them with fine abrasive cloth, such as cleaning solid particles, dirt, etc. When cleaning a large number of bearings, first pour hot engine oil with a temperature of 90 ~ 100 ℃ to melt the sealing oil. At the same time, dig out all the old oil with a tool without sharp edges and chips, then pour hot for a few minutes, then wash the oil with kerosene, and then wash it with gasoline. After cleaning, wear film gloves and dry the bearing on a clean cloth or paper on the workbench.