OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 4 No. 4 2022 b Fig. 13. Dependence of roughness on the value of periodic vertical feed St at depth t: a – for GW 1; b – for GW 2 а less on St). The roughness obtained for St1 = 0.01 mm/double stroke differs from the roughness obtained for St3 = 0.02 mm/double stroke by 2.3 times for GW 1, and 1.6 times for GW 2. Since the use of GW 2 increases the area of the contact spot of the tool with the workpiece (by 35 %), the processing requires more power consumption. This is consistent with the conclusions of Ermolaev V.K. [29]. Tougher processing conditions implemented on the same equipment worsened the quality of the processed surface. Line of further research. The acoustic method, which has gained reputation in many types of processing, can provide high-quality information support, if sufficiently studied. Therefore, identifying the features of the acoustic characteristics inherent in profile grinding and establishing the relationship between it and the wear rate of the grinding wheel, allow the current condition of the tool to be established. It also opens the way for adjusting the grinding modes according to the product quality requirements. The main line of further research in this area is the upgrading of the mathematical models and expanding the area of its practical applicability. In order to establish a reliable relationship between the indirect acoustic parameters of profile grinding and the quality characteristics of the processed surface, the dynamics of changes in the micro- and macrotopography of the surface of the grinded workpieces over time need to be studied. The significance degree depends on the variety of experimental factors and, accordingly, the applicability of models in a
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