Acoustic emission as an information factor of dissipative processes in metal cutting
The paper focuses on the issues of using acoustic emission signals as information characteristics of dissipative cutting processes. We analyzed time dependences of the root-mean-square values of the amplitudes (RMS) and energy-frequency distributions of the acoustic signals of the cutting process. Furthermore, we identified the ranges of frequencies, amplitudes and energies of acoustic waves, responsible for individual dissipative mechanisms of the cutting process. Findings of research show that technological media, depending on the composition and thermophysical properties, have a different effect on the processes of plastic deformation and fracture during cutting, which directly affect the energy-frequency distribution of the acoustic emission signal. We have come to a conclusion that, irrespective of the lubricating and cooling technological media used, the energy of acoustic signals, when cutting at a speed of 50 m / min, is 2.0‒2.5 orders of magnitude higher than when cutting at a speed of 75 m / min, which indicates a wider range of acoustic emission sources; in this case, the composition of the cooling lubricants significantly affects the energy of acoustic waves.
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