Patent US4924050A successfully refreshed from Google Patents.
US4924050A
Expired / Lapsed
US
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Wire electrode for use in spark-erosive cutting
Assignee: Berkenhoff and Co KG
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Filing: 1989-03-27
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Granted: 1990-05-08
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Expires: 2009-03-27
Abstract
Abstract A wire electrode for spark-erosive cutting includes a core area and an outer coating. The wire electrode is reduced in cross section in order to achieve a high surface quality characteristic and a high strength characteristic, is subsequently diffusion annealed in an oxidizing atmosphere, is thereafter again reduced in cross section, is exposed to a recrystallizing annealing and is deformed to a final dimension. The wire electrode has, on the one hand, a very even, fine-granular structure and is, on the other hand, provided with a very even and dense surface, which assures an excellent spark transfer.
Inventors
- 👤 Hans Hermanni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:15
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23H; B23H7/00; B23H7/02; B23H7/08
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A method for the manufacture of a wire electrode for use in spark-erosive cutting, with the wire electrode including a core surrounded by an outer layer, comprising reducing the wire electrode in cross section in a first step, subsequently diffusion annealing the wire electrode in an oxidizing atmosphere in a second step, subjecting the wire electrode to a further reduction in cross section to an intermediate diameter in a third step, recrystallizing annealing in a reducing atmosphere in a fourth step, and deforming the wire electrode to a final diameter in a fifth step.
Claim 2
Independent Claim
94 words
A method for the manufacture of a wire electrode for use in spark-erosive cutting, with the wire electrode including a core surrounded by an outer layer, comprising reducing the wire electrode in cross section in a first step, subsequently diffusion annealing the wire electrode in an oxidizing atmosphere in a second step, subjecting the wire electrode to a further reduction in cross section to an intermediate diameter in a third step, recrystallizing annealing in a reducing atmosphere in a fourth step, and deforming the wire electrode to a final diameter in a fifth step.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein the core of the wire electrode is a copper alloy or a copper-zinc alloy and that zinc is used as outer coating.
Claim 4
Dependent Claim
52 words
The method according to claim 1, wherein the core of the wire electrode is a copper alloy or a copper-zinc alloy and is provided with an outer coating of a metal having a low volatilization temperature, as, for example, cadmium, bismuth, antimony or an alloy of one or several of said metals.
Claim 5
Dependent Claim
26 words
The method according to claim 1, wherein the deformation in the first step is 40 to 70% in relationship to base cross section of the material.
Claim 6
Dependent Claim
25 words
The method according to claim 1, wherein annealing in the second method step occurs at a temperature in the range of 454° to 902° C.
Claim 7
Dependent Claim
32 words
The method according to claim 3, wherein annealing in the second method step takes place until a diffusion layer of 100 to 500% of the thickness of the outer coating is formed.
Claim 8
Dependent Claim
24 words
The method according to claim 1, wherein annealing in the second method step is one of an electric resistance annealing, induction and radiation annealing.
Claim 9
Dependent Claim
19 words
The method according to claim 1, wherein a deformation of 40 to 70% occurs in the third method step.
Claim 10
Dependent Claim
26 words
The method according to claim 1, wherein recrystallizing annealing in the fourth method step occurs at a temperature in the range of 600° to 850° C.
Claim 11
Dependent Claim
18 words
The method according to claim 1, wherein the deformation in the fifth method step is 10 to 80%.
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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) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |