Wire spark erosion device and initial hole forming method

摘要

A wire electric discharge machining apparatus (100) comprises a wire spool (2) on which a wire electrode (1) is wound, a straightening unit (6) for performing a treatment for straightening the wire electrode supplied from the wire spool, a machining power supply (7) for applying a wire Tension between the wire electrode and a workpiece (10) via a lead terminal (71) disposed above the workpiece and making contact with the wire electrode, and a control unit (20) for controlling the directional unit and the machining power supply such that a Tension is applied between the workpiece and the wire electrode that has undergone the straightening treatment to perform spark erosion machining to form a starting hole (11) in the workpiece.