Analysis of forming forces at SPIF using Taguchi method - Mihai-Octavian, Popp; Sever-Gabriel, Racz; Mihaela, Oleksik; Claudia, Gîrjob; Cristina, Biriș (Annals of ”Dunarea de Jos” University of Galati, Fascicle V, Technologies in machine building, 2024)