Influence of depth of hardened layer on slewing bearing

There is no non-destructive testing method for the depth of the hardened layer of the raceway, which is mainly ensured by the process and equipment. The necessary depth of the hardened layer is a guarantee that the slewing ring raceway does not spall. When the slewing bearing is subjected to an external load, the point contact of the ball with the raceway becomes surface contact. Yes - an ellipse with a major axis of a and a minor axis of b. In addition to compressive stress, the raceway is also subjected to shear stress, and the maximum shear stress occurs below the surface. In the depth of 47a, the depth of the hardened layer of the raceway must be greater than o 47a (generally 0.6a). This is also the original criterion for determining the depth of the hardened layer according to the size of the ball diameter rather than the diameter of the slewing ring. The minimum guaranteed value is given. What is the effect of insufficient depth on the bearing capacity of the slewing bearing? Its quantitative description is: the rated static capacity is proportional to the depth of the hardened layer and can be calculated, and the depth of the hardened layer requiring only 4 mm is only quenched. To 2.5mm, then C will be reduced from 1 to 0.65, resulting in network support failure in the form of raceway spalling, even if the welding repair measures will not help.