RESEARCH ON THE INFLUENCE OF THE MACHINED MATERIAL ON THE INTENSITY OF REGENERATIVE SELF-OSCILLATIONS DURING TURNING

Purpose. To study the influence of the processed material on the intensity of regenerative self-oscillations during turning. Research methods. The research was conducted by an experimental method, in which oscillograms of oscillations of the cutting edge of the cutter-oscillator were recorded. The analytical method was used to study the oscillograms on which the parameters of the oscillatory system of the cutter-oscillator were measured, which characterize the law of motion of the cutting edge during self-oscillations. Results. It has been established that the intensity of self-oscillations during turning is influenced by the type of crystal lattice and the number of shear planes of the processed material. The greater the number of shear planes, the easier the material is subjected to plastic deformation and the more intense the vibrations can be generated. Also, the ability to excite or dampen vibrations during turning is particularly affected by the frequency of chip segmentation. For example, a low frequency of chip segmentation during turning of difficult-to-machine materials (titanium) can dampen regenerative self-oscillation. Processing of different materials with intensive regenerative self-oscillation occurs with the formation of different types of chips: articulated, fractured, cyclic. Scientific novelty. The obtained results confirm the influence of the mechanical and physical and technical properties of the processed material on the excitation or damping of regenerative self-oscillations. The properties of the processed material influence the chip formation process in the cutting zone, which in the sense of the classical scheme of the self-oscillating system is a regulator. Practical value. The obtained results prove the influence of the properties of the processed material on the intensity of regenerative self-oscillations during turning and provide an opportunity to take the necessary measures to reduce vibrations.