US4988552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical discharge machining electrode
Assignee: Composite Concepts Co
•
Filing: 1988-06-17
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Granted: 1991-01-29
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Expires: 2008-06-17
Abstract
Abstract A wire electrode for a traveling wire EDM apparatus that comprises a copper clad steel core that is clad with a homogenous, outer brass layer using a classical bonding process. The copper clad steel core has a conductivity in the range of 50%-70% IACS (International Annealed Copper Standard) and the brass layer comprises 35%-50% by volume of the electrode. The brass layer comprises 65% copper and 35% zinc in an optimum construction. For a wire electrode having an overall diameter of 0.010 inches, the outer homogenous, brass layer is substantially 25 microns thick when the brass comprises 35% by volume of the wire and the copper clad steel core has a conductivity of 60% IACS and is contructed from AISI 10006 steel wire.
Inventors
- 👤 Dandridge S. Tomalin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:28
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12903; Y10T428/12917; Y10T428/12924
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A wire electrode for an EDM process, comprising: (a) a copper clad steel core having a conductivity of at least 50% IACS; (b) a homogenous copper/zinc alloy outer layer bonded to said core wire by a mechanical cladding process using pressure and heat whereby a metallurgical bond is effected between said core wire and said outer layer, said outer layer comprising substantially 35%-50% (by volume) of the overall electrode.
Claim 2
Dependent Claim
69 words
A wire electrode for an EDM process, comprising: (a) a copper clad steel core having a conductivity of at least 50% IACS; (b) a homogenous copper/zinc alloy outer layer bonded to said core wire by a mechanical cladding process using pressure and heat whereby a metallurgical bond is effected between said core wire and said outer layer, said outer layer comprising substantially 35%-50% (by volume) of the overall electrode.
Claim 3
Dependent Claim
18 words
The wire of claim 1 wherein said copper/zinc outer layer comprises 65% copper and 35% zinc by weight.
Claim 4
Dependent Claim
22 words
The wire of claim 1 wherein copper forming a portion of said core comprises substantially 35% by volume of the overall electrode.
Claim 5
Dependent Claim
84 words
A wire electrode for an EDM process, comprising: (a) a copper clad steel core including a low carbon AISI 1006 steel core wire and a copper clad layer of sufficient thickness to provide a conductivity of 50%-70% IACS; (b) a homogeneous brass outer layer bonded to said core wire by a mechanical bonding process using pressure and heat whereby a metallurgical bond is effected between said core wire and said brass outer layer, said outer layer comprising 35%-50% (by volume) of the overall electrode.
Claim 6
Dependent Claim
84 words
A wire electrode for an EDM process, comprising: (a) a copper clad steel core including a low carbon AISI 1006 steel core wire and a copper clad layer of sufficient thickness to provide a conductivity of 50%-70% IACS; (b) a homogeneous brass outer layer bonded to said core wire by a mechanical bonding process using pressure and heat whereby a metallurgical bond is effected between said core wire and said brass outer layer, said outer layer comprising 35%-50% (by volume) of the overall electrode.
Claim 7
Dependent Claim
29 words
The wire electrode of claim 4 wherein the overall diameter of the electrode is 0.010 inches and the thickness of said brass layer is substantially greater than 15 microns.
Claim 8
Dependent Claim
30 words
The wire electrode of claim 4 wherein the overall diameter of the electrode is 0.010 inches and the thickness of said brass layer is in the range of 25-30 microns.
Claim 9
Dependent Claim
18 words
The wire electrode of claim 4 wherein said brass layer comprises 65% copper and 35% zinc by weight.
Claim 10
Dependent Claim
19 words
The wire electrode of claim 4 wherein said brass layer comprises substantially 40% by volume of the overall wire.
Claim 11
Dependent Claim
16 words
The wire electrode of claim 4, wherein said mechanical bonding process comprises a roll bonding process.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-01-28 | 1994-07-30 | 1995-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-28 | 1998-07-30 | 1999-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-28 | 2002-07-30 | 2003-01-29 | $7700.00 | Window Closed / Lapsed |