Wire electric discharge machining apparatus comprising wire bobbin on which wire electrode is wound

摘要

An apparatus is provided with a wire bobbin (3) on which a wire electrode (1) is wound, a fastening base (25) for fastening the bobbin (3) to prevent it from rotating, a guide pulley (23) for supporting the electrode (1), a rotating arm (21) for supporting the pulley (23), drawing out the wire electrode (1), and allowing the electrode (1) to rotate around the bobbin (3), a sliding mechanism (24) for supporting the guide pulley (23) on the rotating arm (21) according to the position where the wire electrode (1) is wound, and a breaking motor (13) for driving the rotating arm (21). The consumption of the electrode (1) can be dispersed to improve the machining speed and accuracy. Moreover, the reliability can be improved and the production cost is low.