CBN inserts negative chamfering means grinding the front angle of 5 5 ° – 30 °on the common straight

edge and the width is about 0.05~0.50.

As the width and angle of the cbn turning inserts chamfer increase, it is beneficial to increase the toughness

of the PCBN inserts and the strength of the cutting edges.

1)Cutting force moves backward.

2)The cutting force increases, the cutting edge becomes dull, and the edge is forced into the form of

compressive stress.

3)The straight edge of the cbn turning inserts becomes a force on the surface, and the actual force surface is

limited to increase, which can make best use of the advantages and bypass the disadvantages.

4)Be benefit for the diffusion of cutting heat.

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