| 摘要 |
PROBLEM TO BE SOLVED: To smoothly perform upset forging by suppressing an elongation amount caused by reduction by an anvil without impairing the efficiency of reduction by the anvil. SOLUTION: When the reduction of a forming blank 4 is carried out and an elongation amount L1 of the forming blank 4 after the reduction is large and the elongation amount L1 is out of a halfway specified range, the anvil 3 is rotated and the reduction by the anvil 3 is started, and reduction by the rotation of the anvil 3 is continued until the completion of upset forging. When the elongation amount L1 is within the halfway specified range, the reduction speed is changed, and the reduction of the forging blank 4 is carried out without rotating the anvil 3. COPYRIGHT: (C)2013,JPO&INPIT |
