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The main aim of this work is the assessment of the machinability of alloyed ductile iron before the austempering process. 16MnCr5 alloy steel and alloyed ductile specimens were subjected to drilling tests. The effect of drilling parameters on cutting force was investigated based on the Taguchi approach. Based on the results, a regression model was established to predict thrust force at various drilling conditions. The predicted thrust forces ratio was then used to evaluate the machinability of alloyed ductile respect to the 16MnCr5 alloy steel. The results showed that at lower feed rate, the normal drilling force is very close for both materials, such that the estimated machinability rating is 86%.

Evaluation of machinability of alloy ductile iron in term of thrust drilling force