Abstract: A method and device for removing an electromagnetic core, the method including: using an electromagnet to magnetize or demagnetize a metallic upper nozzle when a magneto-conductive workpiece is cut off in a WEDM manner; attracting a core capable of being completely cut off and separated in the workpiece; utilizing the metallic upper nozzle to detect whether attracted; if the core is attracted, moving the core to a target area; demagnetizing and dropping the core in a trash area. The device is applied to a WEDM machine; after the metallic magneto-conductive upper nozzle is magnetized by the electromagnet, the upper nozzle is used to attract the magneto-conductive core; a metallic water spray cover is utilized to detect whether the core is attracted; the core is moved to the target area by a motion system of the WEDM machine, and dropped in a trash device after the upper nozzle is demagnetized.

Abstract: A sealing apparatus comprises a circulating channel for a wire cutting machine, and the sealing apparatus further includes a channel at the position of a lower arm in the fluid tank for injecting a liquid, and a sealing O-ring installed at the sealing apparatus for preventing a leak of liquid, such that a circulating channel is formed around the periphery of the lower arm. The liquid is injected through an injecting inlet into the circulating channel such that the centrifugal force produced by the whirling flow can wash away the debrises attached on the lower arm, and discharge the debrises from a discharge opening to the outside.