SURFACE ROUGHNESS MEASURING METHOD Russian patent published in 1999 - IPC

FIELD: measurement technology; mechanical engineering. SUBSTANCE: high voltage is applied between surface of part which serves as anode and cathode. Width of frequency spectrum of discharge alternating-current component is measured by level of 0.2-0.5 of operating voltage. Roughness of surface is determined by formula R_a= k•f+R_o, where R_a is surface roughness; k is proportionality coefficient; f is measured spectrum width; R_o is empirical parameter. Values k and R_o are calculated by calibration curve of roughness dependence from spectrum width. Method allows determination of part surface roughness directly in process of part machining. EFFECT: enhanced accuracy of determination. 1 dwg, 1 tbl