Research On The Dynamic Considerations Of Cutting Chatter Of Machine Tool

The nonlinear dynamic cutting force existing in the process of cutting is detailed analyzed based on the theoretical of cutting chatter, a model coupled with the elastic subsystem of workpiece and the elastic subsystem of cutting tool by means of dynamic cutting force is presented to analyze the cutting chatter of multi degree of freedom nonlinear vibration system; the nonlinear coupled vibration equation of multi-degree freedom nonlinear vibration system are established based on dynamical characteristic of machine, nonlinear dynamics theory and method. The main content of this research includes four aspects as follow:(1) The mechanism of machine tool chatter is investigated when the cutting process caused by velocity feedback, position feedback, and model coupling is analyzed respectively.(2) According to the machine dynamics theories, the physical model of cutting chatter of machine tool is established. Multiple degrees movement equations of nonlinear cutting force coupling is proposed based on nonlinear vibration theory.(3) The numerical solutions of the multiple degrees of freedom system when the system within primary resonance is obtained; The stability of the system is studied by using approximate equation with the damping parameter variety; Globe bifurcation of the internal resonance system is give out with parametric variable as the graver force.(4) Based on the method of multiple scales, the approximate analytic solution of equations is discussed thoroughly, and analysis the characteristics of cutting chatter caused by velocity feedback is investigated.This research achievements have important practical significance for control and prevent cutting chatter occurred and increase processing precision.