Due to the high heat resistance of bearing steels, many cutting tools such as traditional carbide tools, ceramic tools and traditional CBN tools do not allow the bearing steel to be processed very well.Ceramic tools and traditional CBN tools, although they can be used in finishing operations, However, it cannot solve the problem of interrupted cutting and machining of bearing steel with large margin.

After Halnn continued to study hard, in 2005, the non-metallic binder CBN tools BN-S20 grade was developed, which broke the the problem of CBN tools could not be used for heavy interrupt cutting and large margin machining. The situation of hard steel is a worldwide breakthrough in the CBN tools industry.

The advantages of the CBN tools BN-S20 grade, in addition to ensuring the hardness and wear resistance of the traditional CBN tools, improve the impact toughness, fracture resistance and seismic performance of the CBN tools. The following describes the cutting parameters of Halnn CBN tools BN-S20 and other grades of bearing steel.

CBN tools		Workpiece Details
Insert Model	SNGN120712	Component	Slewing Bearings
Cutting Type	Dry Cutting	Materials	42CrMo
Process	Finishing	Hardness	HRC47-55
Cutting Data		Component and Insert Image
Vc(m/min)	110
Ap(mm)	0.5
Fr(mm/r)	0.45
Machining Effect: With same precision requirements, the efficiency of BN-S20 Solid CBN Insert is 4 times of grinding process, and the costs only about 20%.

Due to the variability of the bearing steel workpiece after heat treatment, for the large amount of bearing steel after heat treatment, the different CBN tools grades can be selected for different margins.

(1) If the machining allowance is ≥ 2mm or more, choose the CBN tools BN-S20 grade of Halnn, which belongs to solid CBN tools.

(2) Machining allowance <2mm, choose Halnn tools BN-S200 grade and BN-H11 grade (as shown below), The CBN tool BN-S200 grade belongs to solid CBN tools,which is mainly used for small-volume finishing process because of its different composition. The CBN tool BN-H11 grade belongs to the welded CBN tool . The depth of the above two CBN tools needs to be controlled. The best effect within 0.5mm