| 摘要 |
PURPOSE:To increase yield by installing a gripper at a position opposite to the pump ram of a closed forging press and thereby forging a ring at an end of a long material during two reciprocating stroke of the pump ram and cutting off. CONSTITUTION:In the first forward stroke of a pump ram from the top dead center, a press ram 5 moves to the terminal position of stroke and closes the die. In forward stroke of the pump ram 3 toward the bottom dead center, a long material A is always gripped firmly by a gripper 9. A ram 7 for punch goes forward and a punch 7a goes into the tip of the long material, and upsetting is performed. When the pump ram 3 returns to the top dead center by backward stroke, the gripper 9 is loosened by an opening and closing device 10, and a ring body A2 is formed leaving inner burr A1 at the tip of the long material A. In the next stroke, the inner burr A1 is blanked by intrusion of the punch 7a, and the ring body A2 is cut off. At the same time, the inner burr A1 is returned to the tip of the long material A. |
