Method and device for removing electromagnetic core

A method for removing an electromagnetic core, mainly comprising the steps of:

• when the execution of a wire-cut electrical discharge machining shape is nearly completed,
• determining by a cutoff detection loop whether a core is completely cut off and separated, and then starting to perform electromagnetic core removal;
• if not, then continuing to perform discharge machining to cut off the core, and switching a cutoff machining parameter until the core is separated;
• if so, the core, the workpiece and the lower nozzle form a loop, then magnetize an electromagnetic attraction device starting to switch on, enabling the electromagnetic attraction device to have a magnetic attraction force;
• determining by an attraction detection loop whether the core can be completely attracted up;
• if not, then continuing to magnetize the electromagnetic attraction device;
• if so, the core, the workpiece and the electrically-conductive and magneto-conductive upper nozzle form a loop, then the attracted core moving to a specified area position;
• demagnetizing the electromagnetic attraction device;
• determining whether the core is dropped;
• if not, then using an upper nozzle to persistently spray water to and separate the core below;
• if so, then ending the core dropping determination step;
• separating the core from the electromagnetic attraction device, and dropping the core in a specified trash area.