Article 9318

Title of the article

THE USE OF INTEGRAL ESTIMATES OF THE SPECTRAL DENSITY OF VIBROACOUSTIC VIBRATIONS
TO ASSESS THE DYNAMIC QUALITY OF MACHINE TOOLS 

Authors

Ignat'ev Aleksandr Anatol'evich, Doctor of engineering sciences, professor, sub-department of automation, control, mechatronics, Yuri Gagarin State Technical University of Saratov (77 Politekhnicheskaya street, Saratov, Russia), E-mail: atp@sstu.ru
Samoylova Elena Mikhaylovna, Candidate of engineering sciences, associate professor, sub-department of automation, control, mechatronics, Yuri Gagarin State Technical University of Saratov (77 Politekhnicheskaya street, Saratov, Russia), E-mail: atp@sstu.ru
Ignat'ev Stanislav Aleksandrovich, Doctor of engineering sciences, professor, sub-department of automation, control, mechatronics, Yuri Gagarin State Technical University of Saratov (77 Politekhnicheskaya street, Saratov, Russia), E-mail: atp@sstu.ru
Shamsadova Yakha Shaidovna, Applicant, Yuri Gagarin State Technical University of Saratov (77 Politekhnicheskaya street, Saratov, Russia), E-mail: atp@sstu.ru 

Index UDK

681.51 

DOI

10.21685/2072-3059-2018-3-9 

Abstract

Backround. The dynamic quality of machines is one of the dominant factors affecting both the geometric parameters of the accuracy of the parts, and the physical and mechanical characteristics of the treated surface layer. Individually, each machine has a certain dynamic quality, changing both in the process of operation and the variation of the values of the parameters of the cutting mode. Relevant in the manufacture of precision parts for machine and plant engineering is the estimation of the real dynamic quality of machine tools the characteristics of vibro-acoustic oscillations.
Materials and methods. Theoretically and experimentally the correspondence of changes of integral estimates of spectral densities of vibroacoustic oscillations of the dynamic system of the grinding machine and its stability reserve with the waviness of the treated surface is revealed.
Results. By analytical modeling, a monotonic decrease of integral estimates of the spectral density of vibroacoustic (VA) oscillations of the dynamic system of the grinding machine, a similar decrease in the integral estimates of autocorrelation functions (ACF) and the stability reserve with an increase in the attenuation coefficient of ACF. Experimental studies on four automated inside SIW-5 grinding machines for machining bearing rings have shown that the values of the integral spectrum estimates are applicable to assess the dynamic quality of the machines, which correlates with the accuracy of processing.
Conclusions. The values of the integral estimates of the spectral density of VA oscillations of a dynamical system inside the grinding machine can first to rank machines on dynamic quality, and second, by the minimum value of the integral spectrum estimate to determine the machine with the lowest value of waviness of the raceways of the bearing rings, which is consistent with previously obtained results for the assessment of the dynamic quality of machine tools based on integral estimates of the ACF and the stability margin. 

Key words

grinding machine, dynamic quality, vibroacoustic vibrations, spectral density, autocorrelation function, integrated assessment, bearing rings, waviness of the surface 

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References

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Дата создания: 19.04.2019 14:05
Дата обновления: 22.04.2019 08:27