Shearing Performance in Piercing Non-oriented Electrical Steel Sheets by Using Nanoperiodic-structured Rectangular Punch

A nanostructured rectangular Tungsten Carbide Cobalt (WC-Co) punch was utilized for piercing the non-oriented electrical steel sheets under the specified clearances with and without reverse holding force. The sheared surfaces were analyzed by Scanning Electron Microscopy (SEM) to determine the burnished and fractured surface area ratios. The punched-out work material was sliced into three layers to obtain a hardness map and estimate the plastic dissipation work. The hardened area and plastic dissipation work were reduced by themselves by decreasing the clearance and applying the reverse holding force.