The hardened materials of hard turning slewing bearing and wind power rotary table bearing have high hardness. The CNC lathe CBN tools can greatly improve the processing

efficiency and reduce the production cost.

Slewing bearing, also known as disc bearing, rotating bearing or slewing bearing, is a large bearing that can bear comprehensive load. It can bear large axial and radial load and 

overturning torque at the same time. It is generally equipped with installation hole, inner or outer tooth hole, lubricating oil hole and sealing device.

Analysis on turning difficulties of slewing bearing

1) High hardness. After heat treatment, the hardness of the rough parts of slewing bearing is generally above HRC50. It is difficult to process with ordinary tools, and the 

phenomenon of machining immobility often occurs.

2) Large cutting force and high cutting temperature. In high-speed turning, more heat is generated per unit time, the temperature of the contact area between the tool tip and the 

workpiece is high, the phenomenon of non wear resistance and low service life of the tool often occurs, and the machining effect is not ideal.

3) There is intermittent cutting. There are continuous or intermittent cutting conditions during the machining of slewing bearing, and ordinary tools are prone to tool collapse, 

resulting in frequent tool change.

Advantages of CBN insert in machining slewing bearing

1) The pcbn insert has high hardness and good red hardness at high temperature. CBN machine tools has high hardness, which is second only to diamond. It can maintain high

 hardness even at high temperature, and can realize high-speed turning of high hardness slewing bearing.

2) Good wear resistance and long service life. LINKUT indexable cbn tools has good wear resistance, anti tool collapse, intermittent cutting, hard turning after heat, and high efficiency 

of slewing bearing.

3) It can replace grinding with turning. The friction coefficient between CBN tool and other materials is 0.1 ~ 0.3. When machining the workpiece of slewing bearing, it has high precision

and finish, good dimensional consistency and small shape error. It can realize turning instead of grinding.

Based on our experience, when machining slewing bearing, if the cutting depth exceeds 0.5mm, it is recommended to use solid CBN tool; Others recommend the use of tipped pcbn inserts.