CBN ball end milling cutter can complete the milling process for high hardness (hrc45-70) steel die  with only one cutter, which not only saves complicated tool change and 

improves the processing efficiency, It can also greatly shorten the subsequent grinding time.

When directly milling high hardness (hrc45-70) steel die with coated cemented carbide ball end milling cutter with good heat resistance and wear resistance, several cutters 

are usually required to complete the milling tool, 

The main reasons why it is difficult to cut high hardness materials include:

1) high hardness;

2) large cutting resistance;

3) high cutting temperature.

Therefore, the milling cutter used for cutting high hardness materials must have:

1) high heat resistance;

2) high wear resistance;

3) tip shape that is not easy to collapse..

According to LINKUT previous experience, the hardness of the cutting edge of the milling tool should be more than 3 times that of the material to be milled in order to achieve 

normal milling.