Manufacturing Processes - Metal Forming

The maximum reduction in cross-sectional area per pass ($R$) of a cold wire drawing process is $R=1-e^{-(n+1)}$, where $n$ represents the strain hardening coefficient. For the case of a perfectly plastic material, $R$ is

A steel wire is drawn from an initial diameter ($d_i$) of 10 mm to a final diameter ($d_f$) of 7.5 mm. The half cone angle ($\alpha$) of the die is 5º and the coefficient of friction ($\mu$) between the die and the wire...