OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 4 No. 4 2022 F46 K 6 V 35 grinding wheel, pursuant to GOST R 52781–2007. The subject is the spectral composition of the natural vibration frequencies of GW 1 and GW 2. An ICHSK-2 natural vibration frequency meter was used to register and process the acoustic signal, and determine the spectral composition of the natural vibration frequencies of the grinding wheels. This device is designed for acoustic monitoring of the physical and mechanical properties of objects and detecting product defects using the spectral analysis of the acoustic signal of the object’s response. In particular, the ICHSK-2 has a mode to study grinding wheels. This enables the sound index (SI) of the wheel to be established, and, based on this, to determine the hardness degree of the object pursuant to GOST R 52710 – 2007. The device determines the SI based on the physical and mechanical properties of the material of the grinding wheels, as well as its geometric parameters (Table 1). Four experiments were carried out on each test object (GW 1 and GW 2). According to the data summarized in Table 1, the SIs of the grinding wheels were determined according to its physical, mechanical, and geometric parameters. Experimental study of acoustic signals during flat grinding The section describes a comparative experimental study of acoustic signals during flat grinding using wheels of varying profiles. The object of the study is flat pendulum grinding; the subject is an acoustic signal, accompanying this process. Fig. 3. Grinding wheels straight profile bending vibrations 250×H×76: Informative frequencies and Natural frequencies obtained experimentally [23] Ta b l e 1 Parameters of the grinding wheels required to determine the sound index Parameter GW 1 GW 2 GW designation 1 250×32×76 25А F46 K 6 V 35 2700 rpm GOST R 52781-2007 Abrasive material type white electrocorundum 25 A GW dimensions (D×H×d), mm 250×32×76 250×32×76 GW shape factor (F), m-1 0.001175 0.001182 GW mass (m), kg 3.14 2.72 GW density (ρ), g/cm3 2.02
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