Force and Chip Formation in Single-Grit Orthogonal Cutting with Shaped CBN and Diamond Grains

Single-grit orthogonal cutting tests have been performed on a carbon steel with shaped CEN and diamond single grains (#20/24). The cutting tests were carried out by means of a reciprocating surface grinder. The cutting and thrust forces were measured under different cutting conditions. Chip formation mechanism was also studied. Thus, the effects of cutting speed and take angle on the forces on chip formation became clear for the two aprasive types. The CBN grain was much lower in cutting forces than the diamond grain, and the forces increased largely by changing a rake angle from −45° to −75°.