| 摘要 |
PURPOSE:To make consumption of an electrode smaller as well as to perform stable electric discharge machining, by constituting the electrode in a way of charging an evaporable metal interposingly in a clearance between electrode materials, and cooling the electrode with heat of evaporation to be absorbed by the evaporable metal and a dielectric fluid at their evaporation. CONSTITUTION:An electric discharge machining electrode is formed in the following process that powder of an evaporable metal 2 is mixed with an electrode material 1 of particle powder consisting of copper or copper-zinc or ferrous graphite and sintered, or after sintering and molding the electrode material 1, the evaporable metal is impregnated an interposed in a clearance. This electrode is opposed to a workpiece 3, thus electric discharge machining takes place. The evaporable metal 2 is oozed to a surface of the electrode material 1 by discharge heat, cooling the electrode. Therefore, in combination with a spouted dielectric fluid, cooling action is performable, thus electrode service life is prolongable.
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