The material of slewing bearing inner circle is 42CrMo, hardness is HRC58~62, using Solid CBN RCGX1207, cutting parameters: Vc=120~160m/min, ap=0.15~0.35mm, F=0.1~0.2mm/r.
The durability of solid CBN is more than 2 times of the original ceramic insert, and the processing efficiency is 2.5 times of the ceramic insert.