METHOD OF FORMING STEEL BALL BLANKS, IN PARTICULAR FOR ROLLING BEARINGS

摘要

In a method of forming steel ball blanks (4), in particular for rolling bearings, a starting steel cylinder (1) is plastically deformed; the plastic deformation is firstly performed in radial direction, for obtaining an essentially cylindrical blank (1a) provided with an intermediate axial portion (6a) having reduced cross-section with respect to that of the starting cylinder (1), and then in axial direction by pressing to obtain a ball blank (4) to be directly subjected to hardening.