Mechanism of self-oscillation in cutting process systems

The main reasons for the primary initiation of self-oscillations are considered, which under certain conditions affect the intensity of self-oscillations. The effect of the instability of the cutting process on self-oscillations is shown, namely, periodic disruption of growths, formation and chipping of chip elements, setting and sticking on the rear surfaces. These phenomena have been shown to disrupt the overall stability of the cutting process, but occur at a frequency significantly different from the frequency of self-oscillations. It is shown that the frequency of steady-state self-oscillations is always close to the natural frequency of the least inertial element of the oscillatory system or slightly exceeds it due to the loading of the system during cutting and increasing its gesture-bone, and, therefore, frequency. The analysis shows that all mechanisms of self-oscillation in cutting processing systems can be interpreted as the effect of shear thickness fluctuations on the stability of the machine elastic system movement, and the given periodic and quasi-periodic solutions of nonlinear differential equations regarding the change in shear thickness during self-oscillations should be taken as the basis for theoretical analysis of the self-oscillation process during turning.