Patent ID: 11925972
Assignee: NATIONAL UNIVERSITY CORPORATION TOKAI NATIONAL HIGHER EDUCATION AND RESEARCH SYSTEM
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A precision forging method for a metal material, the metal material including a wall portion, which extends in a first direction, and a pre-working projecting wall, which extends from the wall portion in a second direction intersecting the first direction, the precision forging method comprising:
arranging the metal material in a die cavity of a die;
arranging a first punch, which includes a working end surface and a cutting blade formed at an edge of the working end surface, in the die cavity so that the first punch is opposed toward part of the wall portion thickness-wise and the pre-working projecting wall of the metal material;
arranging a second punch at a side of the pre-working projecting wall opposite to the first punch;
moving the first punch in the first direction within a range of a height of the wall portion in a state in which the metal material is held in the first direction and a length of the pre-working projecting wall in the second direction is maintained so that the cutting blade cuts the part of the wall portion thickness-wise located in a moving path of the punch and causes shear deformation in the cut part to move the cut part toward the pre-working projecting wall; and
moving the second punch so as to follow movement of the first punch in the first direction.