OBRABOTKAMETALLOV technology Vol. 25 No. 3 2023 To ensure the required modes of high-speed grinding of rails, the force of pressing can vary in the range 0.8–1.2 of the nominal value of the current load (45 A). That is, the technological modes of operation of the high-speed electric drive for current load range 37–53 A, which corresponds to the range of forces pressing the grinding wheel to the rail 2,200–3,100 N. The test results of the high-speed rail grinding technology are presented in Table 2. Graphically, the test results are presented in figs. 12–15. Ta b l e 2 Test results of high-speed rail grinding technology Passage No. The speed of the grinding trolley movement, km/h Speed of the grinding wheel rotation, min-1 Angle of transverse inclination of the grinding motor, degree The pressing force of the grinding wheel on the current load, A The actual pressing force of the grinding wheel, N Metal removal, mm Average metal removal, mm Roughness of the processed surface, µm The presence of cauterization (+/-) 1 10 5,000 -60 51 2,706 0.41 0,37 5.8 + 2 5,000 -40 51 2,704 0.4 5.4 + 3 5,000 -20 53 2,785 0.37 4.5 + 4 5,000 0 55 2,827 0.35 4.4 - 5 5,000 10 55 2,835 0.34 4.8 - 6 5,000 20 53 2,788 0.32 4.6 - 7 15 5,000 -60 51 2,712 0.49 0,28 6.2 + 8 5,000 -40 51 2,710 0.36 5.5 + 9 5,000 -20 53 2,786 0.25 4.6 - 10 5,000 0 55 2,832 0.19 3.2 - 11 5,000 10 55 2,836 0.21 3.8 - 12 5,000 20 53 2,790 0.20 4.8 - 13 20 5,000 -60 51 2,706 0.33 0,20 6.6 - 14 5,000 -40 51 2,704 0.28 5.8 - 15 5,000 -20 53 2,785 0.22 4.5 - 16 5,000 0 55 2,827 0.18 3.1 - 17 5,000 10 55 2,835 0.09 4.2 - 18 5,000 20 53 2,788 0.12 5.1 - 25 30 5,000 -60 51 2701 0.21 0,11 7.1 - 26 5,000 -40 51 2,698 0.19 5.7 - 27 5,000 -20 53 2,783 0.11 4.9 - 28 5,000 0 55 2,819 0.05 3.6 - 29 5,000 10 55 2,821 0.07 5.0 - 30 5,000 20 53 2785 0.03 5.3 -
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