Influence of the tool vibration on the part surface in longitudinal turning

Dynamic cutting system is exposed to disturbances depending on the machine state and its accuracy. The process of chip formation due to the sliding surfaces periodicity generates vibrations. Controlled vibrations are introduced into the cutting zone to improve machining. However, any consensus on the vibration effect on the dynamic system state and the part quality indicators is missing. This is largely because the studies are not disclosing internal structure of the disturbance interaction with the dynamic system, as well as its transformation into the part geometric characteristics. The paper presents results of studying a dynamic cutting system disturbed by the vibration effects. Mathematical simulation is carried out, the disturbances effect on the system properties and the part geometric characteristics is described. Three frequency ranges are considered: low-frequency limited from above by the subsystem natural frequencies, mid-frequency including the subsystem natural frequencies and high-frequency lying outside the subsystem passband. The vibration influence on parametric self-excitation, formation of the attractive sets of deformations, vibration stabilization, etc. is studied. Simulation results are making it possible to determine new approaches to increasing the machining efficiency. Besides, they are also useful in constructing a digital model of the cutting process dynamics.
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