Using stochastic characteristics of vibroacoustic oscillations in the analysis of the dynamic quality of machine tools

Abstract

Background. Application of stability margin of dynamic system, integral estimates of autocorrelation functions and spectra of vibro-acoustic oscillations in machine tools is relevant for evaluation of their dynamic quality and purpose of cutting mode, which is theoretically justified by solution of stochastic equation of oscillations in “cutter-detail” system. Materials and methods. An experimental-analytical method is used to substantiate the use of functionals from autocorrelation functions and spectra of vibration-acoustic oscillations in machines to select a rational cutting mode and determine the initial phase of critical tool wear. Results. Results of experimental studies on turning and grinding machines on evaluation of their dynamic quality at various modes of machining and wear of cutter are presented. Conclusions. The results of studies of the stochastic characteristics of oscillations of a dynamic system showed the feasibility of assessing the dynamic quality of automated machine tools. This allows to compare by parameters, to choose a technological mode for processing high-precision parts with a given quality, and to identify the initial phase of catastrophic cutter wear for timely replacement and better use of the resource.

Keywords

• machines
• dynamic quality
• vibration acoustic oscillations
• autocorrelation function
• spectral density
• stability margin
• integral estimates
• processing quality