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The results indicated that in order to obtain a high value of MRR within the work interval of this study, Ton should be fixed as low as possible, and conversely, the larger the selected I and U. And the optimal value of MRR was 139.126 mg/min at optimal process parameters I = 10 A, U = 90 V and Ton = 100 s. The mathematical model for the MRR can be effectively employed for the optimal process parameters selection in diesinking EDM for SKD11 die steel. Empirical tests show that the model can calculate quite accurately predicted by MRR (error 0.6%). | Application of response surface methodology for evaluating material removal in rate die-sinking EDM roughing using copper electrode
