Hitachi Metals, Ltd.

Hiroshi Matsuzaki

Hiromitsu Kuroda

Takayuki Tsuji

Tetsuya Tokumitsu

Takamitsu Kimura

Yosuke Shiba

Yuichi Komuro

Shingo Amamiya

An electrical discharge machining electrode wire includes a core including a copper or a copper alloy, and a covering layer that covers a periphery of the core and includes a zinc. The covering layer includes an outermost layer consisting of an &#x3b5;-phase of a copper-zinc based alloy. The outermost layer has a Cu concentration of 12 to 20 mass % and a variation range within 5 mass % in the Cu concentration in a longitudinal direction of the electrode wire.

Electric discharge machining electrode wire and manufacturing method therefor

An electrical discharge machining electrode wire includes a core including a copper or a copper alloy, and a covering layer that covers a periphery of the core and includes a zinc. The covering layer includes an outermost layer consisting of an &#x3b5;-phase of a copper-zinc based alloy. The outermost layer has a Vickers hardness of 200 to 300 Hv.

An electrical discharge machining electrode wire includes a core including a copper or a copper alloy, and a covering layer covering a periphery of the core and including a zinc. The covering layer includes an inner layer including a &#x3b3;-phase of copper-zinc based alloy and covering the periphery of the core, and an outer layer including an &#x3b5;-phase of copper-zinc based alloy and covering a periphery of the inner layer. An x-ray diffraction intensity of (0001) of the &#x3b5;-phase is more than twice an x-ray diffraction intensity of (332) of the &#x3b3;-phase.

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Hitachi, Japan

Hiroshi Matsuzaki