Patent US4424432A successfully refreshed from Google Patents.
US4424432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode material for travelling-wire type electrical discharge machining
Assignee: Japan Kinoko Research Center Foundation
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Filing: 1978-10-31
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Granted: 1984-01-03
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Expires: 1998-10-31
Abstract
Abstract A method of electrical machining by the travelling-wire EDM process is improved by utilizing as the wire electrode for increased removal rate and reduced wear an electrode material which is drawn from a composition of 0.1 to 3% by weight zirconium, 0.3 to 10% zinc and the balance copper.
Inventors
- 👤 Hideo Kaneko
- 👤 Makoto Onoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:48
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A method of machining a workpiece which comprises the steps of: (a) drawing an elongated element having a thickness not greater than 0.5 mm from a cast composition consisting of 0.1 to 3% by weight zirconium, 0.5 to 10% by weight zinc, and the balance copper; (b) displacing said elongated element along a predetermined path to form a travelling-wire machining electrode therefrom and juxtaposing the travelling-wire machining electrode with a workpiece across a machining gap flooded with a liquid dielectric; (c) applying time-spaced electrical pulses across said electrode and said workpiece to effect electrical discharges across said gap and machine said workpiece; and (d) relatively displacing said path of said electrode of said composition and said workpiece to form a machined contour in said workpiece.
Claim 2
Independent Claim
125 words
A method of machining a workpiece which comprises the steps of: (a) drawing an elongated element having a thickness not greater than 0.5 mm from a cast composition consisting of 0.1 to 3% by weight zirconium, 0.5 to 10% by weight zinc, and the balance copper; (b) displacing said elongated element along a predetermined path to form a travelling-wire machining electrode therefrom and juxtaposing the travelling-wire machining electrode with a workpiece across a machining gap flooded with a liquid dielectric; (c) applying time-spaced electrical pulses across said electrode and said workpiece to effect electrical discharges across said gap and machine said workpiece; and (d) relatively displacing said path of said electrode of said composition and said workpiece to form a machined contour in said workpiece.
Claim 3
Dependent Claim
37 words
The method defined in claim 1 wherein the zinc content of said composition is not greater than 5% by weight and the zirconium content is at least 0.5% by weight but not greater than 2% by weight.
Claim 4
Dependent Claim
16 words
The method defined in claim 2 wherein the zinc content is at most 3% by weight.
Claim 5
Dependent Claim
20 words
The method defined in claim 1 wherein the element is drawn in a plurality of drawing steps with intervening annealing.
Claim 6
Dependent Claim
76 words
In an apparatus for the electrical machining of a workpiece wherein a travelling-wire electrode is displaced along a predetermined path and is juxtaposed with said workpiece across a machining gap, a liquid dielectric is fed to said gap, and time-spaced machining pulses are applied across said gap, the improvement wherein said travelling-wire electrode is a drawn elongated element consisting of 0.1 to 3% by weight zirconium, 0.5 to 10% by weight zinc and the balance copper.
Claim 7
Dependent Claim
76 words
In an apparatus for the electrical machining of a workpiece wherein a travelling-wire electrode is displaced along a predetermined path and is juxtaposed with said workpiece across a machining gap, a liquid dielectric is fed to said gap, and time-spaced machining pulses are applied across said gap, the improvement wherein said travelling-wire electrode is a drawn elongated element consisting of 0.1 to 3% by weight zirconium, 0.5 to 10% by weight zinc and the balance copper.
Claim 8
Dependent Claim
32 words
The improvement defined in claim 5 wherein the zirconium content of said composition is 0.5% by weight to 2% by weight and the zinc content thereof is at most 3% by weight.
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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) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |