OBRABOTKAMETALLOV Vol. 26 No. 2 2024 technology Figure 11 shows the cross-sectional dimensions of the hole measured in increments of 0.027 mm, the diameter of the chamfered hole is 1.433 mm, the diameter of the bottom of the hole is 0.389 mm, the depth of the hole hav was 0.574 mm. The calculation of the electrochemical equivalent of U10A steel requires taking into account the mass fraction of the main elements related to metals: iron (98.47 %) and manganese (0.23 %) [35]. The chemical composition of the ladle analysis is taken from the regulatory and technical documents [32]. Table shows the weight and volume electrochemical equivalents of U10A steel. Fig. 11. Hole dimensions in 10 % NaCl with a stationary cathode-tool of circular cross-section with outer and inner diameters of 0.908 mm and 0.603 mm for a duration of 3 minutes Electrochemical equivalents of U10A tool steel Element Electrochemical equivalent εm, g/A∙min εV, сm3/А∙min Fe 0.01736 2.22279 Mn 0.01708 2.18693 U10A 0.01759 2.25198 Thus, based on calculations carried out according to the formula presented in [29], the current output is 70.83 %, or 0.708. If the metal current output coefficient n is within the range of 0.5 to 1.0, it means that the anode is actively dissolved during electrolysis [29, 31–33]. This fact is consistent with the data obtained on the basis of polarization studies of the electrochemical dissolution of U10A steel in 10 % aqueous NaCl solution. The experiments performed and calculations of the current output made it possible to evaluate the performance of the U10A steel electrochemical machining process in the selected electrolyte composition. In the processing scheme with a fixed cathode, the size of the interelectrode gap a0 at the beginning of the process corresponds to the set end-to-end gap, while at the end of processing, the value of the interelectrode gap increases by an amount equal to the technological allowance z, and is equal to the expression, ak = a0 + z. When the electrode tool is fixed, the rate of electrochemical dissolution and processing performance decrease with an increase in the interelectrode gap value. The formula presented below [31–32] is valid provided that the value of the current output does not change with fluctuations in the current density. , 2 0 mm/min, ( ) V DECM V U a U ε θη ϑ = + ε θητ
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