ON THE WEAR MECHANISM OF CUBIC BORON-NITRIDE BASE CUTTING TOOLS

The wear mechanism of cubic boron nitride base cutting tool in turning was evaluated for some structural materials. It is shown that an.increase in cutting speed causes a higher intensity of chemical interaction between tool and workpiece materials to form a liquid phase layer on the front face of the tool. Tool wear is accompanied by the removal of this layer, the resultant wear products arriving at non-contacting zones of the cutting insert and entering into the environment.