US5762726A
Expired / Lapsed
US
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Wire electrode and process for producing a wire electrode, particular for a spark erosion process
Assignee: Berkenhoff and Co KG
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Filing: 1996-03-22
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Granted: 1998-06-09
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Expires: 2016-03-22
Abstract
Abstract In order to produce a wire electrode having a core consisting of a copper/zinc alloy and to produce a specific sheath layer, the sheath layer is coated onto the core at a temperature at which no diffusion occurs. The wire electrode is subsequently heated at a heating speed higher than 10° C. per second, briefly annealed at temperatures above 500° C. and subsequently cooled again very rapidly at cooling speeds higher than 10° C. per second.
Inventors
- 👤 Bernd Barthel
- 👤 Heinrich Groos
- 👤 Hans Hermanni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:02
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12625; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12861; Y10T428/12903
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A process for producing a product wire electrode for a spark erosion process comprising the steps of: providing a wire having a core formed of a homogeneous material or multilayer material, the outer surface of said core consisting of copper or a copper alloy and having a predominant α-phase fraction; forming a sheath layer of zinc or a zinc alloy on the outer surface of the core at a temperature at which no diffusion occurs between the core outer surface and the sheath layer to form a wire electrode; annealing the wire electrode at a heating speed of at least 10° C. per second and at an annealing temperature of from above 500° to 800° C. until the sheath layer consists essentially of a homogeneous crystalline phase; and cooling the wire electrode at a cooling speed greater than 10° C. per second to produce the product wire electrode.
Claim 2
Dependent Claim
148 words
A process for producing a product wire electrode for a spark erosion process comprising the steps of: providing a wire having a core formed of a homogeneous material or multilayer material, the outer surface of said core consisting of copper or a copper alloy and having a predominant α-phase fraction; forming a sheath layer of zinc or a zinc alloy on the outer surface of the core at a temperature at which no diffusion occurs between the core outer surface and the sheath layer to form a wire electrode; annealing the wire electrode at a heating speed of at least 10° C. per second and at an annealing temperature of from above 500° to 800° C. until the sheath layer consists essentially of a homogeneous crystalline phase; and cooling the wire electrode at a cooling speed greater than 10° C. per second to produce the product wire electrode.
Claim 3
Dependent Claim
23 words
The process as claimed in claim 1, wherein the wire electrode is drawn to its final diameter before, during or after the cooling.
Claim 4
Dependent Claim
16 words
The process as claimed in claim 1, wherein the wire electrode is shaped before the annealing.
Claim 5
Dependent Claim
23 words
The process as claimed in claim 1, wherein the annealing time is selected to produce a sheath layer consisting of a gamma phase.
Claim 6
Dependent Claim
24 words
The process as claimed in claim 1, wherein the annealing time is selected to produce a sheath layer consisting essentially of an epsilon phase.
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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) | 2001-06-08 | 2001-12-08 | 2002-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-08 | 2005-12-08 | 2006-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-08 | 2009-12-08 | 2010-06-09 | $7700.00 | Window Closed / Lapsed |