US4968867A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire electrode for wire cut electric discharge machining
Assignee: Mitsubishi Electric Corp
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Filing: 1989-02-09
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Granted: 1990-11-06
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Expires: 2009-02-09
Abstract
Abstract A wire electrode for wire cut electric discharge machining having a core wire of high thermal conductivity (made of copper, silver, aluminum or their alloys), an intermediate layer formed by a low-boiling point material (zinc), and an outermost layer of brass having high mechanical strength.
Inventors
- 👤 Masato Banzai
- 👤 Yoshio Shibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:25
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
142 words
A wire electrode for wire cut electric discharge apparatus for effecting electric discharge machining in which a work liquid is supplied to a small gap between the wire electrode and a workpiece, and said wire electrode is constituted by a core wire and a core wire coating layer formed on said core wire, characterized in that said wire electrode is elongated by a wire drawing process, said core wire coating layer is formed by brass having a high mechanical strength, and said core wire is formed by a material having higher thermal conductivity than said core wire coating layer, wherein said wire electrode constituted by said core wire and core wire coating layer is an integrally drawn product, the cross-sectional area of the core wire coating layer to the total cross-sectional area of the wire electrode being in the range of 50-90%.
Claim 2
Dependent Claim
142 words
A wire electrode for wire cut electric discharge apparatus for effecting electric discharge machining in which a work liquid is supplied to a small gap between the wire electrode and a workpiece, and said wire electrode is constituted by a core wire and a core wire coating layer formed on said core wire, characterized in that said wire electrode is elongated by a wire drawing process, said core wire coating layer is formed by brass having a high mechanical strength, and said core wire is formed by a material having higher thermal conductivity than said core wire coating layer, wherein said wire electrode constituted by said core wire and core wire coating layer is an integrally drawn product, the cross-sectional area of the core wire coating layer to the total cross-sectional area of the wire electrode being in the range of 50-90%.
Claim 3
Dependent Claim
22 words
The wire electrode according to claim 1 wherein said brass includes zinc in a range of from 30 wt % to 40%.
Claim 4
Dependent Claim
28 words
The wire electrode according to claim 1, wherein an outermost layer made of a metal having good electric discharge properties is formed on said core wire coating layer.
Claim 5
Dependent Claim
23 words
The wire electrode according to claim 1, wherein an outermost layer of an oxide film is formed on said core wire coating layer.
Claim 6
Dependent Claim
18 words
The wire electrode according to claim 1, wherein said core wire coating layer comprises a plurality of thin
Claim 7
Dependent Claim
18 words
The wire electrode according to claim 1, wherein said core wire comprises a plurality of twisted thin wires.
Claim 8
Dependent Claim
36 words
The wire electrode according to claim 4 or 5, wherein said outermost layer formed on said core wire coating layer is a thin layer of an alloy containing Zn, Cd or Mg as the major component.
Claim 9
Dependent Claim
17 words
The wire electrode according to claim 6, wherein said core wire includes at least one piano wire.
Claim 10
Dependent Claim
19 words
The wire electrode according to claim 1, wherein said core wire is formed by copper or a copper alloy.
Claim 11
Dependent Claim
19 words
The wire electrode according to claim 1, wherein said core wire is formed by silver or a silver alloy.
Claim 12
Dependent Claim
19 words
The wire electrode according to claim 1, wherein said core wire is formed by aluminum or an aluminum alloy.
Claim 13
Dependent Claim
19 words
The wire electrode according to claim 3, wherein said outermost layer is formed by magnesium or a magnesium alloy.
Claim 14
Dependent Claim
19 words
The wire electrode according to claim 3, wherein said outermost layer is formed by zinc or a zinc alloy.
Claim 15
Dependent Claim
19 words
The wire electrode according to claim 3, wherein said outermost layer is formed by cadmium or a cadmium alloy.
Claim 16
Dependent Claim
87 words
A wire electrode for a wire cut electric discharge apparatus for effecting electric discharge machining in which a work liquid is supplied to a small gap between the wire electrode and a workpiece, characterized in that said wire electrode comprises a core wire formed by a material having a high thermal conductivity, an intermediate layer formed by a low-boiling point material which is formed on said core wire and an outermost layer formed by brass having a high mechanical strength which is formed on said intermediate layer.
Claim 17
Dependent Claim
87 words
A wire electrode for a wire cut electric discharge apparatus for effecting electric discharge machining in which a work liquid is supplied to a small gap between the wire electrode and a workpiece, characterized in that said wire electrode comprises a core wire formed by a material having a high thermal conductivity, an intermediate layer formed by a low-boiling point material which is formed on said core wire and an outermost layer formed by brass having a high mechanical strength which is formed on said intermediate layer.
Claim 18
Dependent Claim
32 words
The wire electrode according to claim 15, wherein said core wire is formed by a material selected from a group consisting of copper, copper alloys, silver, silver alloys, aluminum and aluminum alloys.
Claim 19
Dependent Claim
17 words
The wire electrode according to claim 15, wherein said intermediate layer is a thin layer of zinc.
References Cited (Backward Citations)
US4287404B1
Cited
US4287404A
Cited
US4341939A
Cited
JPS5789527A
Cited
JPS57156129A
Cited
JPS5859736A
Cited
CH645831A5
Cited
US4448655A
Cited
US4475996A
Cited
JPS5950141A
Cited
JPS6094227A
Cited
JPS61136733A
Cited
US4686153A
Cited
JPS61293725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-05 | 1994-05-07 | 1994-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-05 | 1998-05-07 | 1998-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-05 | 2002-05-07 | 2002-11-06 | $7700.00 | Window Closed / Lapsed |