Wire electric discharge machine provided with disconnection repairing unit

A wire electric discharge machine, comprising:

• an upper wire electrode guide and a lower wire electrode guide;
• a wire electrode fusing mechanism;
• and
• a controller which
• controls electric discharge machining of a workpiece by electric discharge generated between the workpiece and a wire electrode while the wire electrode is being guided by the upper and lower wire electrode guides to move relative to the workpiece along a machining route according to a machining program,
• performs a core fixing in a depositing and accumulating operation by the electric-discharge machining of the workpiece, and depositing and accumulating machining wastes caused by the electric discharge machining in a machined groove to thereby fix (i) a core cut by the electric discharge machining from the workpiece to (ii) a remaining portion of the workpiece,
• stores a core fixing end position where the depositing and accumulating operation performed most lately, among a plurality of positions at which the depositing and accumulating operation is performed, ends, and
• when the wire electrode is disconnected during the electric discharge machining at a disconnection position on the machining route,
• controls the wire electrode fusing mechanism to perform automatic connection of the wire electrode at a position on the machining route between the disconnection position and the stored core fixing end position, and thereafter
• returns the wire electrode to the disconnection position and resumes the electric discharge machining from the disconnection position,
• wherein the controller further
• determines whether an automatic connection position is present between the disconnection position and the stored core fixing end position, and
• controls the wire electrode fusing mechanism to perform the automatic connection at the automatic connection position, in response to determining that the automatic connection position is present between the disconnection position and the stored core fixing end position.