BN-K20 and BNK30 CBN Insert face millingengine block with high precision and performance

Engine Block, usually is made of gray cast iron, which has good strength, Stiffness and wear resistance. And as the base of the engine, the engine block require high on the surface quality, for example, both side Flatness need within0.03mm, Cylinder roundness will be within0.004mm, and the Verticality will be within0.03mm, Surface Roughness require Ra1.6.

In order to satisfy all above requirements, the cutting tools need be used for high speed, and has high precision and high efficiency. It also can be used for milling engine block with large working allowance .

The materials of engine block are gray cast iron, and have low hardness.

Traditional cutting tools can machine. But for the high requirements on the engine block, traditional cutting tools(carbide insert, ceramic cutters and coating carbide insert) can't satisfy all the requirements, many manufacturers use famous brand (Seco, Sandvik ) Insert for milling and boring prosess.

CBN Insert has high hardness, stable performance and long tool life, also can obtain good product quality, so it often is used for milling engine block with high cutting speed. Especially Halnn BN-S300, BNK30 and BN-K20 PCBN inserts, is the most widely used for milling and boring engine block.

And BN-S300 belong to solid cbn insert, mainly used for milling engine block, BN-K20 and BNK30 are brazing pcbn insert, are mainly used for boring process to make sure high surface quality and long tool life. And all of them have been widely used.

When milling engine block with high cutting speed, you can check our web: halnncbn.com first, then contact with us , we will offer you the most widely cbn inserts grades and models. And offer customized service. Any problems, please leave message through my online contact way: skype:cbn_inserts_angels,  Wechat:Halnntools