OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 4 No. 4 2022 Fig. 7. Idle operation acoustic signal spectrogram of the experimental setup main systems considering the change in the tool condition during grinding. In particular, the constant excess kurtoses present in the spectrograms (Fig. 7–11) in the ranges of 550–650 and 2,650–2,700 Hz are definitely related to the operation of the hydraulic system pumps. At the same time, it should be understood that the sound level cannot increase significantly within the indicated frequency limits during the normal operation of the hydraulic system. Acoustic signals accompanying processing with the grinding wheels of various profiles The test samples were ground for 15 minutes (900 seconds). The influence of the shape of the GW profile, the value of the periodic vertical feed St to the depth t, and the duration of grinding T on the acoustic phenomena accompanying the machining process were studied. The main results of studying the acoustic Fig. 8. Spectrograms of initial processing stage with use GW 1 and St1 = 0.01; St2 = 0.015; St3 = 0.02 mm/double stroke feeds Fig. 9. Spectrograms of final processing stage with use GW 1 and St1 = 0.01; St2 = 0.015; St3 = 0.02 mm/double stroke
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