14 Recycled Ti-17 Based Composite Design; Optimization Process Parameters in Wire Cut Electrical Discharge Machining (WEDM) 119 Table 14.9 S/N ratio means and predicted S/N ratio and predicted means of MRR Control factors and levels Results Run U(V) Ton(μs) S(mm/min) P(bar) Ra PredRa SNRA MEAN PMEAN PSNRA 1 80 0.8 29 60 2.92 2.9288 31.9653 39.6527 39.6527 31.9653 2 80 0.9 36 80 1.93 1.9475 33.8247 49.1184 49.1184 33.8247 3 80 1 43 100 1.74 1.7400 35.5128 59.6548 59.6548 35.5128 4 100 0.8 36 100 1.96 1.9425 33.9253 49.6901 49.6901 33.9253 5 100 0.9 43 60 2.48 2.4713 35.3671 58.6623 58.6623 35.3671 6 100 1 29 80 2.01 1.9838 31.7081 38.4958 38.4958 31.7081 7 120 0.8 43 80 2.48 1.8487 34.5344 53.2994 53.2994 34.5344 8 120 0.9 29 100 1.8 1.8175 31.3316 36.8625 36.8625 31.3316 9 120 1 36 60 2.84 2.8400 33.1892 45.6523 45.6523 33.1892 Fig. 14.15 The effect of machining parameters on kerf (μm) Fig. 14.16 The effect of machining parameters on MRR bigest MRR value compared with S1 and S2 the servo voltage U1 corresponds to the greast MRR value wcompared with U3 and U2, the flushing pressure P2 corresponds to the biggest MRR value compared with P1 and P2. The S/N ratio was used to determine the optimum parameters for a smaller value of kerf in WEDM machined surface of Ti17 alloy and according to Fig. 14.16 and Table 14.6 the optimal level of the machining parameters is the level with the greatest S/N ratio.
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