CORE REMOVING DEVICE

摘要

This invention relates to a core removing device for removing, either upward or downward in accordance with the shape of the core, a core cut off from a work by wire cut electric discharge machining and the device includes a core removing unit (6) fitted to an electric discharge machine main body. When a first operation mode is selected in accordance with a code read out from a program after taper machining of a core (20) having an inverted trapezoidal section, the core is brought into close contact with a core suction portion (16) fixed to the piston (15) of the vertical cylinder of the core removing unit by the movement of the piston in a vertical direction and its rotation and the suction portion sucking and holding the core is moved up to pull up the core off the work (19). The core is then moved outside a core fall inhibition range by the horizontal movement of the piston (13) of a horizontal cylinder and is released from the core suction portion. When a second operation mode is selected in accordance with another code associated with the core (20) having a trapezoidal section, the core is held by the suction portion inside the work and under such a state, it is moved to a safe position where it does not hit a lower nozzle (8) or a lower work supporting it even when the core is dropped. Thereafter, the core is released from the suction portion and is permitted to fall by gravity. The core thus dropped is conveyed outside the inhibition range by a belt conveyor or a conveyor arm.