MEASURING METHOD OF SURFACE ROUGHNESS DURING ELECTROLYTIC PLASMA TREATMENT Russian patent published in 2013 - IPC G01B7/34 

FIELD: measurement equipment.

SUBSTANCE: high voltage is applied between a processed part being an anode and a cathode. Values of current density j and high voltage U are measured. Roughness of surface during processing is determined as per the following formula: Ra=R_min+(R₀-R_min)/exp(t/(τ₀+k₁j+k₂U)), where R_min - minimum achieved surface roughness for the used electrolyte; R₀ - initial value of surface roughness of the processed part; t - time; j - current density; U - voltage; τ₀ - average value of time constant; k₁, k₂ - proportionality coefficients depending on the part material, nature and concentrate of electrolyte. Values τ₀, k₁, k₂ are calculated as per a family of calibration traces of relationship between time constant of roughness reduction and voltage U and current density j.

EFFECT: increasing quick action of the measurement.

1 tbl, 2 dwg