FORGING METHOD AND FORGING PUNCH FOR CUT MATERIAL

摘要

PROBLEM TO BE SOLVED: To provide a forging punch capable of preventing the development of cracking due to the ductility limit of a material even in the working large in fractional reduction in upsetting height. SOLUTION: The forging punch is provided with a flat face A orthogonal to the direction of a punch axis L on the outer periphery side, and a tilting face B having a projecting inclination toward the center of the punch succeeding the flat face to constitute a tip part, wherein the angle formed by the tilting face and the flat face is made to be 30 deg. or less.