A Study on Proposal of Flank Wear Criterion by Using a Built-in Current Sensor when Manufacturing the Mold Materials in a Smart Machine ToolSeung-Yub Baek, Sung-Taek Jung and Dae-Yu ParkMATEC Web Conf., 207 (2018) 03007DOI: https://doi.org/10.1051/matecconf/201820703007