Hard turning refers to the process method of turning hardened steel as the final machining or finishing. The strength and hardness of the parts after quenching are high, 

and the plasticity is poor, which brings difficulties to the cutting process.

Interrupted machining of hardened steel: Interrupted cutting has always been a problem, not to mention the high hardness of hardened steel around HRC60. Especially 

in high-speed turning of hardened steel, if the workpiece is cut intermittently, the tool will be subjected to more than 100 impacts per minute during the intermittent cutting

of the hardened steel to complete the machining, which is a great challenge to the tool's impact resistance. 

LINKUT tipped cbn inserts with excellent impact resistance and long tool life, such as our BNT4 and BNT6 CCGW pcbn inserts turning 20CrMnTi Gear, hardness HRC58-62, 

compared with foreign brand CBN tools, processing efficiency increased by 30%.