Patent ID: 8667828

Claim:
A crankshaft production apparatus comprising: a first die that applies a compressive load to a shaft blank in a longitudinal direction of the shaft blank, is provided at one end side of the shaft blank, and includes a pressurization surface that pressurizes an end surface of the shaft blank, wherein the pressurization surface is inclined by a predetermined inclination angle in a single direction toward a buckling direction of the shaft blank, wherein the buckling direction of the shaft blank is substantially perpendicular to the longitudinal direction of the shaft blank; a second die that applies a compressive load to the shaft blank in the longitudinal direction of the shaft blank, is provided at another end side of the shaft blank opposed to the one end side, and includes a pressurization surface that pressurizes the other end surface of the shaft blank, wherein the pressurization surface is inclined by a predetermined inclination angle in a single direction toward the buckling direction of the shaft blank; a third die installed on the shaft blank; a holding member that holds the third die in a predetermined zone on the shaft blank; and movement restricting portion that restricts a movement of the holding member in a radial direction of the shaft blank together with the third die, in a direction other than the buckling direction.