| 摘要 |
PURPOSE:To perform exact plural bending works by providing a hydraulic circuit which prevents a knock-out plate from rising after punching and executing the succeeding pressing while a part of the work exists on the inside of dies. CONSTITUTION:When a cylinder rod 12 moves in a direction A, the pressure oil flows through a valve 15 to a tank 20 and at the same time a solenoid valve is energized to open a check valve 16 through which the pressure oil flows to a tank 20. Thus the cylinder maintains the pull state and if a solenoid valve 18 is energized, the oil passes through a check valve 19 to enter a cylinder 13 and the rod 12 is lifted. Then even if a punch 4 rises, the position of a knock-out plate 6 does not change and the work 2 is held between dies 5 by the hydraulic device and is horizontally worked by a punch 8 on the plate 6. Since the work 2 is bent while the work is held in the dies 5, the exact plural bending works are accomplished without shifting. |
