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Experimental Research on Regenerative Self-oscillations During Turning 6th

Experimental Research on Regenerative Self-oscillations Duri...

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6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Vnukov, Yuriy Tryshyn, Pavlo Dyadya, Serhiy Kozlova, Olena Natl Univ Zaporizhzhia Polytech 64 Zhukovsky St UA-69063 Zaporizhzhia Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

The paper discusses the results of experimental investigations into regenerative self-oscillations during longitudinal turning using the original design of a cutter-oscillator. This design allows the measurement of oscillations exclusively along the axis of force F-x, coinciding with the direction of the cut thickness variation during cutting along the vibration trace on the cutting surface. In this case, one of the primary sources of self-oscillations - coordinate coupling - is eliminated. It has been established that three-speed zones can be distinguished during longitudinal turning. In the first zone, characterized by low cutting speeds, growth formation is observed. In the second zone, as cutting speeds increase, regenerative self-oscillations are excited up to their maximum level, followed by a subsequent decrease. In the third zone of high speeds, degeneration of regenerative self-oscillations and the realization of vibration-free cutting conditions are observed. Various characteristics were determined during the experiments, including the static deflection of the cutter-oscillator from the position of initial equilibrium, amplitude, and frequency of self-oscillations, the phase shift of waves of neighboring revolutions, length of one wave, and the number of waves on the cutting surface. The research results indicate that the developers of the theory of regenerative self-oscillations and stability lobe diagrams did not consider the influence of a basic mechanism of chip formation, specifically the process of shifting the chip element under an angle. This omission necessitates additional experimental studies to refine the recommended stability lobe diagrams. This article aims to formulate and experimentally verify the general principal differences between dynamic cutting conditions and static ones and, based on this knowledge, investigate ways of increasing the resistance to vibration excitation for each type of machining.

关键词： Vibration Turning Regenerative Self-Oscillations cutter-oscillator Amplitude Frequency

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Experimental Verification of the Impact of Phase Shift Between Neighboring Waves on the Intensity of Regenerative Oscillations During Continuous Cutting 6th

Experimental Verification of the Impact of Phase Shift Betwe...

引用

6th Grabchenko's International Conference on Advanced Manufacturing Processes

作者： Tryshyn, Pavlo Vnukov, Yuriy Dyadya, Serhiy Kozlova, Olena Natl Univ Zaporizhzhia Polytech 64 Zhukovsky St UA-69063 Zaporizhzhia Ukraine

ISBN: (纸本)9783031827488;9783031827464;9783031827457

This study presents experimental findings regarding the influence of phase shift between adjoining waves on the cutting surface and its impact on the intensity of regenerative self-oscillations during continuous cutting without the influence of coordinate coupling. The study was conducted using an original design of a cutter-oscillator with one degree of freedom. The importance of the obtained results lies in the possibility of verifying the fundamental principles of regenerative oscillation theory, presented by developers in the past century, which could not previously be confirmed due to limitations in experimental capabilities. The study revealed the absence of a connection between the magnitude of the remainder from the whole wave and the phase shift of adjoining waves, as well as the absence of influence of these parameters on the intensity of regenerative self-oscillations. These results contradict previously accepted notions and indicate the need to refine theoretical models. However, a significant correlation was found between the frequency of regenerative self-oscillations and the phase shift of adjoining waves. This suggests that vibration during continuous cutting is a self-organizing process. It is noted that the obtained results pertain only to continuous cutting conditions, and further research is planned to expand the investigation to intermittent conditions, such as turning with longitudinal grooves or protrusions, for a more comprehensive understanding of the influence of cutting parameters on oscillation processes. The results of the experimental verification are valuable for optimizing cutting processes to enhance efficiency and processing quality. The article aims to experimentally verify two fundamentally important statements formulated by the developers of the theory of regenerative oscillations for continuous cutting.

关键词： Vibration Turning Regenerative Self-oscillations cutter-oscillator Amplitude Frequency Phase Shift

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