In process of solving problem actively, role of metal cutting carbide circular blade groove has not been paid attention. Changing metal cutting carbide circular blades groove will change flow of deformed material in a positive way. Use different groove of metal cutting carbide blade round shape to change chip flow direction, amount and influence of chemical, thermal and friction loads can also be positively changed.
Another factors related to way of tungsten carbide circular blade for metal cutting enter workpiece. It depends on cutting edge angle, rake angle and knife angle. If rake angle is perpendicular to processed surface, rake angle is on negative number. Cutting force will transmitted to main parts or strongest part of blades. On the other hand, when cutting edge is tilted backward from workpiece surface, rake angle is regarded as a positive number. Cutting force is concentrated on cutting edge, but it is not as strong as main part. In addition, flank of a blade inserted with a positive rake angle must have a wedge angle or a back angle, which further reduces the tool strength.