| 摘要 |
PURPOSE:To perform stable electrification and to promote the high accuracy and high speed of electric discharge machining, by providing machining pulse positive and negative power feed cables to be arranged along the inside or external surface of a guide supporting arm while machining fluid supply pipes to be arranged along the upper surface and the inside or bottom surface. CONSTITUTION:Machining fluid supply pipes 7, passing through the inside of arms 6, are arranged in a position crossing with or in the vicinity of the axis of a wire electrode 4, and even if reaction force, when the pressure rises, acts on the arm 6, the upper and bottom arms 6 of squared shape opening its one end, whose point ends only vertically spread along the wire axis, are prevented from laterally changing guide positions of the arm point ends. While positive and negative cables 9 for feeding power of a pulse from a machining power supply 8 to a machining gap are arranged together in the arm branching in an arm point end part, with one cable connecting with an electrifier 3 in a nozzle while the other with a work 5. In this way, stable electrification can be always performed even with no drag or the like applying an unreasonable deflective load by deformation together with the pipe 7 and the arm 6, and high accurate and high speed electric discharge machining can be performed by correctly holding a guide position of the arm point end.
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