OBRABOTKAMETALLOV technology Vol. 25 No. 3 2023 In this case, the force of pressing the grinding wheel to the rail is determined by the pressure in the pneumatic cylinder, which is automatically adjusted depending on the current load on the windings of the electric motor in accordance with the schematic pattern shown in fig. 5. The specified feature of the rail grinding process does not allow implementing the cutting depth accurately, since metal removal will occur spontaneously depending on a number of factors, and with a high probability will differ from the specified value. Accordingly, the rail profile forming accuracy will Fig. 4. Grinding head attachment pattern: 1 – abrasive wheel; 2 – electric motor; 3 – under-engine plate; 4 – parallelogram suspension; 5 – pneumatic cylinder; 6 – block plate; 7 – axis Fig. 5. The pressing force of grinding wheel common control circuit: 1 – grinding modes control unit; 2 – proportional valve; 3 – converter of the adjusting block; 4 – grinding block; 5 – pneumatic cylinder; 6 – grinding wheel drive motor
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