The process of cutting formation is divided into two stages: extrusion plastic deformation and tearing. The plastic deformation of the workpiece due to cutting forces and cutting heat is mainly at this stage. It can be seen that the higher the cutting speed, the shorter the plastic deformation time, the narrower the shear deformation region, the larger the shear angle, the smaller the deformation factor, and the faster the chip flow rate (80% of the heat of cutting is accounted for by the heat in the chip). The smaller the heat input to the workpiece and the tool, the higher the speed of cutting can be, the average reduction of the cutting deformation rate is 30-40%, which is very suitable for the machining of poor rigidity and thin-walled parts.

From the dynamic analysis of frequency formation, it can be seen that the reduction of cutting force will reduce the amplitude of the vibration (ie, forced vibration) due to the cutting force. The increase of the rotational speed makes the working frequency of the cutting system away from the low-order natural frequency of the machine tool to avoid resonance. Therefore, high-speed cutting can greatly reduce the surface roughness and improve the quality of processing.