OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 6 4 = - + × + × + × - - × × - × × - × × + 0.7004 1.070300415 0.03421764 0.04854912 0.0106517 0.0006473216 0.01304028 on on on Ra I U T I U T U I T + × × × 0.0001738704 . on I T U (4) Fig. 5 presents a hypersurface plot showing the influence of such parameters as voltage and current on the formation of surface quality. It was found that at constant pulse turn-on time Ton = 75 μs, the smallest TE roughness Ra = 2.83 μm was obtained at current I = 4 A and voltage U = 100 V, and the maximum TE surface roughness was Ra = 4.1568 μm at I = 8 A and U = 100 V. The values of the dimensions of the wells parameters change with the change of the power of single discharges acting in the interelectrode gap. The formation of a more accurate and clean surface of TE occurs at the minimum value of the power of discharges, which depend on the value of current. Increasing the current is accompanied by an increase in the depth of wells and obtaining a greater roughness of the TE surface. Figures 6–8 show images of the TE surface after SLM and after copy-piercing EDM processing in the minimum and maximum modes. Areas of melted MS1 powder units are observed on the surface of TE Fig. 4. The regression model hypersurface of electrode flow rate at constant pulse duration Ton = 75 μs; γ is a tool electrode wear (g); I is a current (A); U is a voltage (V) Fig. 5. The regression model hypersurface of the TE surface roughness at constant pulse on time Ton = 75 μs; Ra is the roughness parameter (μm); I is a current (A); U is a voltage (V)
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