Patent US4839487A successfully refreshed from Google Patents.
US4839487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire electrode for wire-cut electrical discharge machining
Assignee: Mitsubishi Electric Corp
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Filing: 1986-12-03
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Granted: 1989-06-13
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Expires: 2006-12-03
Abstract
Abstract A wire electrode for use in wire-cut electrical discharge machining which can be used under a high machining tension and which produces no appreciable deposit on the workpiece it is used to machine. The wire of the invention may be made of an amorphous metal or amorphous alloy composed primarily of iron, cobalt, or copper, and coated on its surface with a layer of a metal such as zinc, magnesium, tin, lead, cadmium or alloys thereof. Alternatively, the wire electrode may be a wire of highly fine crystalline particles fabricated by super-quenching from a pure metal or an alloy of a pure metal in a molten state at a cooling rate of 103 to 105 DEG C./sec in a super-quenching process such as a spinning process which forms a wire in a rotating liquid layer.
Inventors
- 👤 Haruhiko Ito
- 👤 Yoshio Shibata
- 👤 Masato Banzai
- 👤 Takeshi Yatomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:48
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/02; B23H7/08
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
63 words
In an electrical discharge machining (EDM) apparatus for machining a workpiece, said apparatus comprising a pulsed voltage source and an EDM electrode, said pulsed voltage source applying a pulsed voltage between said EDM electrode and said workpiece to machine said workpiece, the improvement wherein said EDM electrode comprises a wire made of at least one of an amorphous metal and an amorphous alloy.
Claim 2
Dependent Claim
63 words
In an electrical discharge machining (EDM) apparatus for machining a workpiece, said apparatus comprising a pulsed voltage source and an EDM electrode, said pulsed voltage source applying a pulsed voltage between said EDM electrode and said workpiece to machine said workpiece, the improvement wherein said EDM electrode comprises a wire made of at least one of an amorphous metal and an amorphous alloy.
Claim 3
Dependent Claim
17 words
An EDM maching apparatus according to claim 1, wherein said wire is drawn into a thin wire.
Claim 4
Dependent Claim
26 words
An EDM maching apparatus according to claim 1, wherein said pure metal is selected from the group consisting of iron, aluminum, magnesium, copper, cobalt and niobium.
Claim 5
Dependent Claim
23 words
An EDM maching apparatus according to claim 1, wherein said alloy contains at least two of iron, aluminum, magnesium, copper, cobalt and niobium.
Claim 6
Dependent Claim
16 words
An EDM maching apparatus according to claim 1, wherein said alloy is composed primarily of iron.
Claim 7
Dependent Claim
19 words
An EDM maching apparatus according to claim 5, wherein said alloy comprises an Fe - Si - B alloy.
Claim 8
Dependent Claim
13 words
An EDM maching apparatus according to claim 6, wherein Fe=70-75%, Si=10% and B=15-20%.
Claim 9
Dependent Claim
19 words
An EDM maching apparatus according to claim 5, wherein said alloy comprises an Fe - P - C alloy.
Claim 10
Dependent Claim
13 words
An EDM maching apparatus according to claim 8, wherein Fe=72-77.5%, P=12.5% and C=10%.
Claim 11
Dependent Claim
14 words
An EDM maching apparatus according to claim 9, wherein said alloy further contains Cr=0-5.5%.
Claim 12
Dependent Claim
21 words
An EDM maching apparatus according to claim 5, wherein said alloy comprises an Fe - Co - Si - B alloy.
Claim 13
Dependent Claim
14 words
An EDM maching apparatus according to claim 11, wherein Fe=71%, Co=4%, Si=10% and B=15%.
Claim 14
Dependent Claim
16 words
An EDM maching apparatus according to claim 1, wherein said alloy is composed primarily of copper.
Claim 15
Dependent Claim
17 words
An EDM maching apparatus according to claim 13, wherein said alloy comprises a Cu - Zr alloy.
Claim 16
Dependent Claim
12 words
An EDM maching apparatus according to claim 14, wherein Cu=60% and Zr=40%.
Claim 17
Dependent Claim
19 words
An EDM maching apparatus according to claim 13, wherein said alloy comprises a Cu - Sn - P alloy.
Claim 18
Dependent Claim
13 words
An EDM maching apparatus according to claim 16, wherein Cu=70-80%, Sn=10-20% and P=0-10%.
Claim 19
Dependent Claim
19 words
An EDM maching apparatus according to claim 13, wherein said alloy comprises a Cu - Zn - Ag alloy.
Claim 20
Dependent Claim
13 words
An EDM maching apparatus according to claim 18, wherein Cu=65-70%, Zn=20-25% and Ag=5-15%.
Claim 21
Dependent Claim
16 words
An EDM maching apparatus according to claim 1, wherein said alloy is composed primarily of cobalt.
Claim 22
Dependent Claim
19 words
An EDM maching apparatus according to claim 20, wherein said alloy comprises a Co - Nb - B alloy.
Claim 23
Dependent Claim
14 words
An EDM maching apparatus according to claim 20, wherein Co=67.5%, Fe=5%, Si=12.5% and B=15%.
Claim 24
Dependent Claim
34 words
An EDM maching apparatus according to claim 1, wherein said wire is coated on its surface with a metal selected from the group consisting of zinc, magnesium, tin, lead, aluminum, cadmium and their alloys.
Claim 25
Dependent Claim
27 words
An EDM machining apparatus according to claim 23, wherein said wire is further coated with a layer of electrically-conductive material over said metal selected from said group.
Claim 26
Dependent Claim
84 words
In an electrical discharge machining (EDM) apparatus for machining a workpiece, said apparatus comprising a pulsed voltage source and an EDM electrode, said pulsed voltage source applying a pulsed voltage between said EDM electrode and said workpiece to machine said workpiece, the improvement wherein said EDM electrode comprises a wire made of highly fine crystalline particles of at least one of a pure metal or an alloy of a pure metal, said particles having a diameter in a range from 0.001 to 0.005 mm.
Claim 27
Dependent Claim
84 words
In an electrical discharge machining (EDM) apparatus for machining a workpiece, said apparatus comprising a pulsed voltage source and an EDM electrode, said pulsed voltage source applying a pulsed voltage between said EDM electrode and said workpiece to machine said workpiece, the improvement wherein said EDM electrode comprises a wire made of highly fine crystalline particles of at least one of a pure metal or an alloy of a pure metal, said particles having a diameter in a range from 0.001 to 0.005 mm.
Claim 28
Dependent Claim
34 words
An EDM machining apparatus according to claim 25, wherein said wire is coated on its surface with a metal selected from the group consisting of zinc, magnesium, tin, lead, aluminum, cadmium and alloys thereof.
Claim 29
Dependent Claim
28 words
An EDM machining apparatus according to claim 26, wherein said wire is further coated with a layer of electrically conductive material over said metal selected from said group.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |