OBRABOTKAMETALLOV Vol. 27 No. 2 2025 technology Ta b l e 2 Physical properties of materials used Name of the material Density (ρ), g/cc Specific heat ca - pacity (cp), J/gK Melting point (Hm), K Thermal conductivity (k), W/mk Electrical conductivity (σ), S/mm NiTi alloy 6.45 0.320 1583 10 3.268 NiCu alloy 8.8 0.427 1623 21.8 5.515 BeCu alloy 8.25 0.420 1253 130 5.645 Copper electrode 8.94 0.394 1356 391.1 10 Fig. 2. Methodology Three main types of quality characteristics were used in the calculation of the S/N ratio: “Larger-isBetter” (LB) for MRR (aiming for the maximum response value), and “Smaller-is-Better” (SB) for TWR and SR (aiming for minimization). The “Nominal-is-Best” (NB) category is applied in cases where it is necessary to ensure precise adherence to a target value, for example, when maintaining specified dimensions. The mathematical expressions for calculating the S/N ratio corresponding to different quality characteristics are presented below (3), (4) and (5):
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