Patent ID: 9623476
Date: 2017-04-18
CPC Classifications: B21D,B21J,B21K

Claim:
1. A method for heating a forging die device which comprises a die having an upper die and a lower die, and a die holding unit for supporting at least one die of the upper and lower dies, and which is configured to perform forging by heating the die after fixing the die holding unit to a press body, the method comprising: preheating at least the one die of the upper and lower dies; placing the preheated die on the die holding unit and then heating the preheated die by a heating unit located in the die holding unit; after the step of placing the preheated die on the die holding unit and then heating the preheated die by the heating unit, heating forming surfaces of the upper and lower dies to a required temperature by heating means different from the heating unit, the heating means different from the heating unit surrounding the outer periphery of the die holding unit with a gap therefrom, and after the step of heating the forming surfaces of the upper and lower dies to the required temperature by the heating means different from the heating unit, placing a forging material between the upper and lower dies to thereby perform forging of the forging material by bringing the forming surfaces of the upper and lower dies into contact with the forging material.