OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 1 2024 Ta b l e 4 Box–Behnken Design with observed values of MRR Exp. No. Gap current (Ig) (A) Magnetic fi eld (B) (T) Pulse on time (Ton) (μs) MRR (mm3/min) 1 8 NO 26 2.32 2 8 0.496 26 2.22 3 16 NO 26 6.00 4 16 0.496 26 6.54 5 12 NO 13 1.93 6 12 0.496 13 2.04 7 12 NO 38 4.66 8 12 0.496 38 5.003 9 8 0.248 13 0.97 10 16 0.248 13 1.88 11 8 0.248 38 2.89 12 16 0.248 38 7.40 13 12 0.248 26 4.86 14 12 0.248 26 4.64 15 12 0.248 26 4.78 Further, to have a better understanding of the eff ect of process parameters, MRR (fi gure 4) is plotted using the developed model varying with process parameters for the T:U (BeCu-treated with Cu-untreated), workpiece and tool combination. Figure 4, a depicts MRR varying with gap current at magnetic strength and pulse on time of 0.248 T and 26 s. The MRR can be seen as increasing with the gap current. a b c Fig. 4. MRR varying with Gap current (a), Magnetic fi eld (b), and Pulse on time (c) The MRR that changes with magnetic fi eld at a gap current of 12 A and a pulse on time of 26 s is shown in fi gure 4, b. Furthermore, MRR fl uctuates with pulse on time at gap current and magnetic strength of 12 A and 0.248 T, as shown in fi gure 4 c. A slight increase in MMR is observed with increasing magnetic strength. However, as demonstrated in fi gure 4 , the MRR seems to increase with the pulse on time. The gap current has the biggest impact on the MRR, followed by the timing of the pulse and the magnetic fi eld strength, which has a negligible eff ect. According to fi gure 4, MRR values decrease with decreasing magnetic fi eld and gap current values. As the values of gap current and magnetic fi eld increase, the MRR also increases. With a magnetic fi eld of 0.4 T and a gap current of 16 A, the MMR exceeds 7 mm3/min. Lower magnetic fi eld and pulse on time values result in lower MRR readings. MRR increases simultaneously with an increase in magnetic fi eld and pulse on time values. MRR exceeds 7 mm3/min with a magnetic fi eld of 0.4 T and a pulse on time of 35 μs.
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