Multi-Wedge Cross Rolling of Balls

The multi-wedge cross rolling process of forming balls is described.The process tool for rolling 8 balls with a diameter of 35 mm is presented.The course of the rolling process,distributions of forming forces as well as maps of effective strain and temperature in the obtained balls are presented by finite element modeling (FEM).Experimental tests of simultaneous forming of 4 balls with a diameter of 22 mm conducted in laboratory conditions at Lublin University of Technology have proved that the balls obtained in multi-wedge cross rolling are of good quality and can therefore be used in both ball mills and rolling bearings.