ZWZ Bearing

ZWZ bearing is a kind of rolling bearing. Rolling bearing is a precision mechanical element that changes the sliding friction between the running shaft and the shaft seat into rolling friction, so as to reduce the friction loss. Rolling bearing is generally composed of inner ring, outer ring, rolling element and cage. The function of inner ring is to match with the shaft and rotate with the shaft; The function of the outer ring is to cooperate with the bearing seat and play a supporting role; The rolling element is evenly distributed between the inner ring and the outer ring with the help of the cage. Its shape, size and quantity directly affect the service performance and service life of the rolling bearing; The cage can make the rolling elements evenly distributed, prevent the rolling elements from falling off, guide the rolling elements to rotate and lubricate.

Precision bearings require high dimensional stability. After ring quenching (especially step quenching), the internal structure still retains more residual austenite. It is an unstable structure. It will change continuously in the process of storage and use, so as to change the bearing accuracy. Therefore, the cold treatment process can reduce the residual austenite in the structure and slightly improve the hardness of parts. However, it should also be noted that the volume of austenite should not be too small, otherwise it is not conducive to the improvement of bearing life.