Surface roughness obtained at stamping of bearing cages Marius Ionuţ Rîpanu, Gheorghe Nagîţ, Laurenţiu Slătineanu, Oana Dodun and Andrei Marius Mihalache MATEC Web Conf., 137 (2017) 05006 Published online: 22 November 2017 DOI: 10.1051/matecconf/201713705006