| 摘要 |
PURPOSE:To obtain an electric discharge electrode of complicated shape, by using gypsum as a mold in that state, preparing a main unit of the electric discharge electrode with metal except copper and forming only a surface part of the electric discharge electrode with copper. CONSTITUTION:A gypsum model 1, equipped with a hollowed part 1a, corresponding to the shape of an electric discharge electrode main unit, is placed on a model bed 2, further a frame 3 is arranged around the model 1 to form a mold 4 made of gypsum. An aluminum alloy is poured to the mold 4 to a level the hollowed part 1a is embedded. Then in a stage solidified with the aluminum alloy, if the mold is released, the electric discharge electrode main unit 5 can be obtained. Copper is diffusibly infiltrated to a corresponding part of the main unit 5 to the hollowed part 1a to form a diffusibly infiltrated layer 6, and then copper plating or copper electroforming is further applied to a surface of the diffusibly infiltrated layer 6 to form an adherent layer 7, finally an electric discharge electrode 8 is completed. |
