CBN tools are more suitable for high speed cutting than trad

With the increasing use of high-precision CNC machine tools in the manufacturing industry, how to improve productivity,
reduce production costs, shorten production cycle and delivery time to improve overall competitiveness, is a problem that
enterprises have been thinking about, and the emergence of high-speed cutting technology has attracted much attention.

In order to achieve high-speed cutting, not only high-precision machine tools but also cutting tools are required. Choosing 
the right cutting tool can do more with less.

 

Current tool materials include carbide tools, ceramic tools and superhard tools (CBN tools and diamond tools). This article 

mainly explains the selection of cutting tools in the field of ferrous materials, so diamond tools are not introduced.

Tool material analysis for high speed cutting

 (1) Carbide tools: Due to the low hardness of the cutter body, the maximum linear speed is controlled at 350 m/min, and 

excessive wear is caused, which is not suitable for high-speed cutting.

 (3) CBN tool: It is the first choice cutting tool for high speed cutting. It is the most widely used in the field of ordinary gray 
cast iron and hardened steel.

CBN tool for high-speed cutting gray cast iron 

CBN tool itself has high hardness, line speed can reach more than 1000m/min (on the basis of machine rigidity), wear resistance
is excellent, and dry cutting is adopted to avoid environmental pollution caused by cutting fluid and reduce total production cost.

For example, Halnn first developed CBN material BNK30 grade for gray cast iron. It uses nano-scale binder and high-purity CBN
particles to optimize the ratio. It can be used for cutting gray cast iron at cutting speed of 500-2000m/min. High-speed machining;
can meet the stable cutting of brake discs, brake drums, engines, gearboxes, etc., especially in the field of finishing, the performance 
advantage is more obvious,also the CBN material, but the life and stability is 50% higher than the homogenous product Even several 
times; the specific cases are as follows:

			Workpiece material:HT250(FC250) Workpiece hardness:HB180-210 Workpiece diameter:Ф328 Surface finish:RA1.6 Processing methods: Dry cutting
Tool material	Tool type	Cutting Speed Vc (m/min)		Feed Rate Fr (mm/r)	Cutting Depth ap (mm)	Tool life (pcs)
A company CBN tool	SCGN090408	700		0.4	0.25	110
Halnn BNK30	SCGN090408	700		0.4	0.25	160↑

CBN tool for high-speed cutting hardened steel 

The hardened steel hardness is generally between HRC 58-62. The tool will generate a lot of heat under high-speed cutting conditions.
If the temperature exceeds the temperature of the tool, the tool will wear out quickly or collapse. Therefore, the tool material for 
high-speed cutting hardened steel needs It has high temperature red hardness, wear resistance and chipping.

At present, the tool materials for high-speed cutting hardened steel are mainly CBN tools. CBN tools can be cut normally at a high 
temperature of 1000 °C, and dry cutting is used to achieve clean production.

Halnn CBN Tools BN-H10 and BN-H21 grades are high-speed cutting tools developed for hardened steel, used in continuous cutting
and interrupted cutting.

Halnn CBN Tools BN-H10 and BN-H21 grades not only have excellent high temperature red hardness and wear resistance, but also 
ensure the stability of hardened steel under severe dimensional tolerances and roughness requirements. 
The specific cases are as follows:

	Processing conditions: Strong interrupted cutting Workpiece hardness:HRC58-62 Tool type:BN-H21 WNGA080408 Cutting parameter:Vc=300m/min          Fr=0.1mm/r           ap=0.3mm
Tool material	Cutting Speed Vc (m/min)	Cutting Depth ap (mm)	Tool life (pcs)
Halnn BN-H21	300m/min	0.3mm	600↑
A European brand CBN tool	300m/min	0.3mm	450