CBN insert
Hard turning hardened steel cutting tools Part 1 Coated carbide alloy insert Coated carbide alloy insert is coating on the carbide insert with excellent toughness, and the coating thickness will be 2~18Îź m. Compared the coated carbide alloy insert and the carbide insert ,coated carbide alloy insert will be better on strength, hardness and the wear resistance. For turning work piece with hardness below HRC45,low costs coated carbide insert will also realize low speed turning . Part 2 Ceramic insert When ceramic insert using normally ,the cutting speed will improve 2~5 times than carbide insert ,especially suit for high hardness materials, finishing process and high speed turning. For finish turning hardened steel hardness between HRC45~55 ,it need choose ceramic insert and need notice that avoiding interrupted turning condition. Part 3 CBN insert The hardness and wear resistance of cbn insert will be no better than diamond insert ,it has excellent superheat. Compared with the ceramic insert ,the impact resistance will be better . It is widely used for hard turning hardened steel. Compared with carbide insert ,it will have higher cutting speed and long tool lifetime. The following will show you the the CBN insert with the recommend cutting parameters as follows:
Hardened steel part
CBN insert grade(finishing)
Gear
Suitable cutting parameters Cutting Depth ap(mm)
Feed Rate Fr(mm/r)
Cutting Speed Vc(m/min)
BN-H10
0.2
0.1
180
Bearing
BN-H11
2.5
0.12
140
Ball Screw
BN-S20
4.5
0.1
90
Synchronizer
BN-H20
0.15
0.1
170
Universal joint
BN-H10
0.15
0.15
190
Tools
BN-S200
0.5
0.12
130
All show us CBN insert will be the best choice to hard turning hardened steel. So I believe that the above figure will help you with choosing the most suitable CBN insert .
Hard turning hardened steel cutting tools