Grinding efficiency improvement of hydraulic cylinders parts for mining equipment Aleksandr Korotkov, Vitaliy Korotkov, Leonid Mametyev, Lidia Korotkova and Tatiana Terjaeva E3S Web Conf., 15 (2017) 03005 Published online: 07 April 2017 DOI: 10.1051/e3sconf/20171503005