Investigation on the High-speed Precision Shearing of 5140 Steel Bars Pre-grooved by LaserYuanzhe Dong, Wei Zhong, Yujian Ren, Shengdun Zhao and Lijun ZhangMATEC Web Conf., 136 (2017) 01004DOI: https://doi.org/10.1051/matecconf/201713601004