PRECISION FORGING METHOD, PRECISION FORGING DEVICE, AND PRECISION FORGING PRODUCT

摘要

A precision forging method includes arranging a metal material (10) in a die cavity (22) so that a distal end surface of circumferential wall (14) of the metal material (10) is opposed toward a stopper (24) and a bottom portion (12) of the metal material (10) is opposed toward a punch (30). Further, the precision forging method includes moving the punch (30), which includes a cutting blade (32) on an edge of a working end surface (31), in the die cavity (22) to cut part of the wall portion (14) thickness-wise with the cutting blade (32) and cause shear deformation in the cut portion.