Electrode wire for electrical discharge machining and manufacturing method for same

Patent metadata

Field	Value
Publication number	US-2017259361-A1
Application number	US-201415107119-A
Country	US
Kind code	A1
Filing date	Nov 7, 2014
Priority date	Nov 7, 2014
Publication date	Sep 14, 2017
Grant date	—

Abstract

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 γ-phase of copper-zinc based alloy and covering the periphery of the core, and an outer layer including an ε-phase of copper-zinc based alloy and covering a periphery of the inner layer. An x-ray diffraction intensity of (0001) of the ε-phase is more than twice an x-ray diffraction intensity of (332) of the γ-phase.

First claim

1 . An electrical discharge machining electrode wire, comprising:
a core comprising copper or a copper alloy; and a covering layer covering a periphery of the core and including a zinc, wherein the covering layer comprises an inner layer including a γ-phase of copper-zinc based alloy and covering the periphery of the core, and an outer layer including an ε-phase of copper-zinc based alloy and covering a periphery of the inner layer, and
wherein an x-ray diffraction intensity of (0001) of the ε-phase is more than twice an x-ray diffraction intensity of (332) of the γ-phase.

2 . The electrical discharge machining electrode wire according to claim 1 , wherein an amount of warpage from an axis along the vertical direction is not more than 80 mm/m when the electrical discharge machining electrode wire is suspended vertically.

3 . The electrical discharge machining electrode wire according to claim 1 , wherein the outer layer is an outermost layer.

4 . The electrical discharge machining electrode wire according to claim 1 , wherein the core comprises a brass.

5 . A method for manufacturing an electrical discharge machining electrode wire comprising a core comprising copper or a copper alloy and a covering layer covering a periphery of the core and including a zinc, the method comprising:
plating the core with a zinc or a zinc alloy once; drawing the plated core; and after the drawing, heat treating in a heat treatment condition under which the covering layer comprises an inner layer including a γ-phase of copper-zinc based alloy and an outer layer including an ε-phase of copper-zinc based alloy and covering a periphery of the inner layer and an x-ray diffraction intensity of (0001) of the ε-phase is more than twice an x-ray diffraction intensity of (332) of the γ-phase.

6 . The electrical discharge machining electrode wire according to claim 2 , wherein the outer layer is an outermost layer.

7 . The electrical discharge machining electrode wire according to claim 2 , wherein the core comprises a brass.

8 . The electrical discharge machining electrode wire according to claim 3 , wherein the core comprises a brass.

Assignees

• Hitachi Metals Ltd

Inventors

• Tsuji Takayuki

Classifications

• H01B13/0036

  Details · CPC title

• C22F1/08 Primary

  of copper or alloys based thereon · CPC title

• H01B13/0026

  Apparatus for manufacturing conducting or semi-conducting layers, e.g. deposition of metal · CPC title

• C25D3/22

  of zinc · CPC title

• H01B7/17

  Protection against damage caused by external factors, e.g. sheaths or armouring · CPC title