# US 10,478,910 B2 · Electrode wire for electro-discharge machining and method for manufacturing the same

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- Number: US 10,478,910 B2
- Document ID: US10478910B2
- Status: Granted
- Kind: B2
- Application number: 14/051,659
- Filed: 2013-10-11
- Published: 2014-04-24
- Granted: 2019-11-19
- Earliest claimed: 2012-10-23
- Applicants: Ki-Chul Seong; Hyun-Soo Seong; Hyun-Kook Seong
- Inventors: Ki-Chul Seong; Hyun-Soo Seong; Hyun-Kook Seong
- Web page: https://patentgrep.com/patent/US10478910B2

## CPC

- B23H 7/08: Wire electrodes
- C23C 2/0035: {Means for continuously moving substrate through, into or out of the bath (C23C2/00344 takes precedence)}
- C23C 2/024: {by cleaning or etching}
- C23C 2/06: Zinc or cadmium or alloys based thereon
- C23C 2/26: After-treatment (C23C2/14 takes precedence)
- C23C 2/28: Thermal after-treatment, e.g. treatment in oil bath
- C23C 2/38: Wires; Tubes
- C25D 7/0607: {Wires}
- B21C 37/042: {Manufacture of coated wire or rods}
- C25D 5/50: by heat-treatment
- B23H: WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL (processes for the electrolytic or electrophoretic production of coatings, electroforming, or apparatus therefor C25D; processes for the electrolytic removal of material from objects C25F; manufacturing printed circuits using precipitation techniques to apply the conductive material to form the desired conductive pattern H05K3/18)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- B21C: MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL

## Abstract

An electrode wire for electro-discharge machining includes a core wire including a first metal including copper and having one of phases α, α+β′, and β′, a first alloy layer formed at a boundary region between the core wire and a second metal plated on an outer surface of the core wire due to mutual diffusion between the core wire and the second metal and having a phase β′, and a second alloy layer formed due to diffusion of the first metal to the second metal and having a phase γ and/a phase ε. A core wire material is erupted onto a surface of the electrode wire for electro-discharge machining, which includes the core wire, the first alloy layer, and the second alloy layer, along cracks appearing on the second alloy layer, so that a plurality of grains are formed on the surface of the electrode wire.

## Claims

### Claim 1

An electrode wire for electro-discharge machining, the electrode wire comprising:
a core wire including a first metal comprising brass having a mixture of copper and zinc and having one of phases α, α+β′, and β′;
a first alloy layer of a first alloy material formed at a boundary region between the core wire and a second metal, the second metal being plated and diffused on an entire outer circumferential surface of the core wire, and said first alloy layer having a phase β′; and
a second alloy layer of a second alloy material formed at an entire outer surface of the first alloy layer due to the diffusion of the first metal to the second metal and having a phase γ and a phase ε,
wherein the second metal includes one selected from the group consisting of zinc, aluminum, tin, and an alloy thereof,
wherein the second alloy layer has a higher hardness and lower tensile strength than the first alloy layer,
wherein the second alloy layer is provided with a plurality of cracks,
wherein the core wire is distributed onto a surface of the second alloy layer,
wherein the core wire directly contacts the first alloy layer and the second alloy layer,
wherein the first alloy layer directly contacts both the core wire and the second alloy layer,
wherein the core wire, the first alloy layer and the second alloy layer are exposed onto the outer circumferential surface of the electrode wire for electro-discharge machining,
wherein α, α+β′, β′, γ and ε are crystalline structures, and
wherein said core wire projects through the first alloy layer and through the cracks of the second alloy layer to the outer circumferential surface of the electrode wire.

### Claim 2 (depends on 1)

The electrode wire of claim 1, wherein the core wire is arranged in a direction substantially perpendicular to a longitudinal direction of the electrode wire for electro-discharge machining, and has a length in a circumferential direction of the core wire two times to ten times greater than a width a direction perpendicular to the longitudinal direction.