In order to avoid excessive damage to the knife blade strength, and due to the constraints of the bulk of Kun, generally take the cutting knife side deflection angle of about 1 ° 30 '~ 2 ° (high speed steel). Carbide 1 ° 30' ~ 3 °. To reduce the cutting vibration, cut the knife along the tip to the support direction gradually thin, the formation of vice angle, high speed steel 1 ° 30 '~ 2 °, carbide 2 ° 30' ~ 3 ° 30 '. When it is not desired to leave a section of unfinished cylindrical rods in the heart of the workpiece, the major angle of the cutting edge can be designed to be 75 ° to 80 °. In order to increase the support strength, the thickness of the tip portion should be increased, and the thickened portion can be designed as a circular arc surface to form a parallel shape with the support surface.
High-speed cutting knife is mainly used in lathes. Turret lathes and automatic machine tools. During the cutting process, the cutting area is difficult to drain, the cooling is insufficient, the thickness of the alloy blade is small and the arm length is long and the rigidity is poor. When the cutting is close to the center, the actual working angle becomes negative and the cutting force is significantly increased Large, will produce vibration and squeeze phenomenon.