OBRABOTKAMETALLOV Vol. 26 No. 3 2024 technology The grinding wheel is pressed against the machined surface of the rail based on the pressure difference in the rod and piston cavities of the pneumatic cylinder. Adjustment of pressure in the cavities of the pneumatic cylinder was adjusted by a proportional pressure regulator based on the data on the current load in the windings of the high-speed electric motor in accordance with the pattern shown in Figure 2. The following measuring and control tools were used in testing the high-speed electric drive: the grinding wheel rotation speed was measured using a “Megeon 18005” laser tachometer; metal removal after mechanical processing was assessed using a PR-03 rail profilograph; the pressure in the pneumatic system was measured using OWEN PD100I-DI1.6-111-0.5 pressure measuring transducers. Specially designed high-speed rail grinding wheels PP 35-250×75×150ZK125VT manufactured by “Experimental Plant Metallist-Remputmash” designed for operating speeds up to 100 m/s were used in the research [21]. a b с в Fig. 4. Overview of the rail grinding unit (the URSH): a – section of railway track; b – rail grinding trolley; c – high-speed electric motor of JSC “Typhoon”; d – frequency converter of JSC “Typhoon”
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