US4163701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electrochemical machining of polyphase alloys
Assignee: Centre Technique des Industries Mécaniques
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Filing: 1978-02-13
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Granted: 1979-08-07
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Expires: 1998-02-13
Abstract
Abstract An electric current is passed through an electrolyte having a neutral pH, between an inert tool-electrode and the alloy which is to be machined to the shape of the tool-electrode. The electrolyte contains fluoride and/or fluoborate ions as well as complexing ions both for the carbide-phase metal or metals of the alloy and for the metallic-phase metal or metals of the alloy.
Inventors
- 👤 Charles Schepacz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:56
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/08; C; C25; C25F; C25F3/00; C25F3/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31; Y10T428/8305
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
A method of electrochemically machining two-phase alloys comprising at least one metallic carbide phase and one metallic phase, comprising the step of passing an electric current between an inert tool-electrode and the alloy to be machined to the shape of the tool-electrode within an electrolyte containing ammonium fluoride and/or ammonium fluroborate and having a pH value within the range of 6 to 8.
Claim 2
Independent Claim
63 words
A method of electrochemically machining two-phase alloys comprising at least one metallic carbide phase and one metallic phase, comprising the step of passing an electric current between an inert tool-electrode and the alloy to be machined to the shape of the tool-electrode within an electrolyte containing ammonium fluoride and/or ammonium fluroborate and having a pH value within the range of 6 to 8.
Claim 3
Dependent Claim
15 words
A method as defined in claim 1, wherein the operation is performed with direct current.
Claim 4
Dependent Claim
13 words
A method as defined in claim 1, wherein dissymmetrical alternating current is employed.
Claim 5
Dependent Claim
20 words
A method as defined in claim 3, wherein the current frequency is within the range of 0.1 to 1.0 c/s.
Claim 6
Dependent Claim
31 words
A method as defined in claim 3, wherein the ratio of the time-width of the positive half-wave to that of the negative half-wave is of the order of 3 to 1.
Claim 7
Dependent Claim
16 words
A method as defined in claim 1, wherein the tool-electrode is of aluminium or aluminum alloy.
Claim 8
Dependent Claim
12 words
Machined parts obtained by means of the method defined in claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-06 | 1983-02-05 | 1983-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-06 | 1987-02-05 | 1987-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-06 | 1991-02-05 | 1991-08-07 | $7700.00 | Window Closed / Lapsed |