Electrode wire for wire electric discharge machining, and method for producing same

Patent metadata

Field	Value
Publication number	US-9849531-B2
Application number	US-201414764956-A
Country	US
Kind code	B2
Filing date	Sep 2, 2014
Priority date	Sep 9, 2013
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

An object of the present invention is to improve machining speed by realizing both conductive properties and discharge performance with regard to an electrode wire for wire electric discharge machining, the electrode wire being obtained by plating a steel wire with a copper-zinc alloy. Another object is to suppress the occurrence of separation, cracking, and the like of plating in a wire-drawing step of an electrode wire. An electrode wire for wire electric discharge machining of the present invention includes a steel wire ( 11 ) serving as a core wire, and a plating layer ( 12 ) that covers the steel wire and that is composed of a copper-zinc alloy, in which an average zinc concentration of the plating layer is 60% to 75% by mass, a conductivity of the plating layer is 10% to 20% IACS, and a wire diameter is 30 to 200 μm.

First claim

The invention claimed is:

1. An electrode wire for wire electric discharge machining, the electrode wire comprising:
a steel wire serving as a core wire; and
a plating layer that covers the steel wire and that is composed of a copper-zinc alloy,
wherein an average zinc concentration of the plating layer is 60% to 75% by mass,
a conductivity of the plating layer is 10% to 20% of 0.15328 ohm (meter, gram) at 20° C.,
a wire diameter is 30 to 200 μm, and
the plating layer covers the entire circumference of the cross section perpendicular to the longitudinal direction of the steel wire.

2. The electrode wire for wire electric discharge machining according to claim 1 , wherein a tensile strength is 2,000 MPa or more.

3. A method for producing the electrode wire for wire electric discharge machining according to claim 1 , wherein a wire-drawing condition index equals a value x that meets the following equation: 1.2≦x≦2.0.

Assignees

• Sumitomo Electric Industries
• Sumitomo (Sei) Steel Wire Corp

Inventors

• Sugimura Kazuaki
• Izumida Hiromu
• Shimizu Kenichi
• Takamura Shinei
• Iwamoto Katsutoshi

Classifications

• C22C18/02

  with copper as the next major constituent · CPC title

• B21C1/02

  Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums · CPC title

• B23H7/08 Primary

  Wire electrodes · CPC title

• C23C2/38

  Wires; Tubes · CPC title

• B23H7/24 Primary

  Electrode material · CPC title