Abstract: A gear is formed in a gear-forming apparatus including a die block formed with an axial bore and a plurality of teeth radially projecting into the bore and having lead-in portions adjacent one axial end of the bore, and an elongated mandrel axially movable into the bore, by placing at least one blank in position outside the die block and adjacent the axial end of the bore, causing the mandrel to extend through the center hole in the blank; forcing the blank into the bore from the axial end of the bore until the blank is moved past the teeth of the die block so that the blank is caused to form gear teeth on its outer peripheral surface by the teeth of the die block; driving at least one of the die block and the mandrel to move with respect to each other so that the gear resulting from the blank is withdrawn together with the mandrel out of the bore in the die block; and removing the gear from the mandrel outside the die block.

Abstract: A method of producing a plurality of identical ring-shaped metal parts from a single blank in the form of solid rod without forming any hole in the blank and without cross-sectionally cutting the blank. The outer periphery of the blank corresponds to the inner periphery of the metal parts to be produced. First the blank is longitudinally compressed such that an end portion of the blank undergoes upsetting and provides a laterally expanded portion having a side periphery corresponding to the outer periphery of the metal parts and a length corresonding to the thickness of the metal parts. Then the laterally expanded portion is subjected to shearing along a plane defining the outer periphery of the blank to part its peripheral region as one of the ring-shaped metal parts. The blank remains in the solid rod form, though somewhat shortened, and therefore can be used to produce additional metal parts by repeating the same procedure until it becomes very short.