TY JOUR TI THEORETICAL STUDY OF THE MATERIAL GRINDING PROCESS IN THE WORKING CHAMBER OF A DISK MILL KW theoretical research KW disk mill KW grinding KW grinding chamber KW parabola JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Semikopenko, I.A. AU Voronov, V.P. AU Belyaev, D.A. AU Borozdin, E.A. PY 2020 IS 5 PB Belgorod State Technological University named after V.G. Shukhov