Obstruction forging method, mold and obstruction forging production system

摘要

PROBLEM TO BE SOLVED: To provide a closed forging method, enhanced in mechanical characteristic, free of deburring traces in a forged product, and suitable for enhancing yield of the product against a forging material. ;SOLUTION: A cylindrical ingot, having the same volume as that of a forging product, having a shape wherein the ratio of a minor axis length of a plane of projection orthogonal to the pressurizing direction to the length in the pressurizing direction is 1 or less, and composed of an upper bottom face, a lower bottom face and a side face whose shape do not contain an angle, is used as a forging material, and is pressurized from the side face of the forging material 15 to obtain an upper arm or a lower arm being a suspension part for a vehicle.;COPYRIGHT: (C)2003,JPO