OBRABOTKAMETALLOV technology Vol. 26 No. 3 2024 Ta b l e 3 Current loads of electric motor to allow metal to ensure the required metal removal at different grinding speeds Grinding speed, km/h at grinding wheel speed Metal removal, mm 0.15 0.2 0.25 0.3 0.35 15 (5,000 rpm) 70–75 А 80–85А 90–95 А 95–100 А 105–110 А 20 (6,000 rpm) 80–85 А 85–90 А 95–100 А 100–105 А – 30 (7,000 rpm) 85–90 А 90–95 А – – – The obtained values of the optimal parameters of the pressure of pressing the grinding wheel to the rail and the current loads of the electric motor allow determining the required parameters and characteristics of the pneumatic drive of the grinding head and electrical systems when designing a new rail grinding train, which allows implementing the required grinding modes to ensure a specified metal removal from the rail. Conclusions According to the results of the conducted tests of rail grinding modes with the use of a new high-speed electric drive of grinding wheel, the following conclusions can be drawn: 1. The new high-speed rail grinding electric drive has improved performance characteristics due to increased productivity and possibility to regulate the grinding wheel speed, which ensures the required metal removal from the rail head with a significant increase in the speed of the rail grinding train. The highspeed electric drive is efficient and operates under the loads specified in the technical specifications for the electric drive with the required torques and speeds. 2. In the high-speed electric drive, the frequency converter maintains the rotation of the electric motor shaft with a constant torque at a rotation speed of 5,000–7,000 rpm and a speed of the rail grinding train Fig. 6. Average values of current load of electric motor at different pressure in the pneumatic system
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