US3607689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply for large-surface electrochemical machining
Assignee: Individual
•
Filing: 1968-08-06
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Granted: 1971-09-21
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Expires: 1988-08-06
Abstract
Abstract A system for the electrochemical machining of metallic workpieces over large areas in which a storage impedance (e.g. a capacitor) is intermittently charged and discharged via a solidstate controlled rectifier switching circuit to apply periodic unidirectional electrolysis pulses of a current magnitude substantially greater than that of the charging source to the electrode system consisting of a tool electrode and the metallic workpiece while an electrolyte is circulated through the gap therebetween.
Inventors
- 👤 Kiyoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:35
CPC Classifications
B; B23; B23H; B23H3/00; B23H3/02; B23H2300/00; B23H2300/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
36 words
The system defined in claim 1 wherein said switch means is a solid-state controlled rectifier having an anode and cathode in circuit with said condenser and said electrodes, and a gate tied to said triggering means.
Claim 2
Dependent Claim
23 words
The system defined in claim 2 wherein said source includes a direct-current source and a surge-suppressing choke connected in series with said condenser.
Claim 3
Dependent Claim
53 words
The system defined in claim 2, further comprising a quenching network connected across the anode and cathode of said controlled rectifier, said power-supply means further comprising an inductance connected in series with said condenser and the anode and cathode of said controlled rectifier, and a rectifying diode connected in series with said electrodes.
Claim 4
Dependent Claim
36 words
The system defined in claim 2 wherein said power-supply means includes a stepdown transformer having an input connected in series with said controlled rectifier and said condenser, and an output connected in series with said electrodes.
Claim 5
Dependent Claim
23 words
The system defined in claim 5, further comprising a rectifying diode in series with the output of said stepdown transformer and said electrodes.
Claim 6
Dependent Claim
55 words
The system defined in claim 2 wherein said triggering means includes a charge-level-detecting network connected across said condenser and responsive to the attainment of a predetermined charge level, and transistor-switch means operable by said detector and connected to the gate of said controlled rectifier for triggering same upon the attainment of said predetermined charge level.
Claim 7
Dependent Claim
75 words
The system defined in claim 7 wherein said transistor-switch means includes a unijunction transistor having its emitter connected to said detector, an amplifying transistor having its base connected to one of the bases of said unijunction transistor and an emitter-collector network, an output transformer having a primary winding in series with said emitter-collector network, and rectifier means connected in Series with the secondary winding of said output transformer and the gate of said controlled rectifier.
Claim 8
Dependent Claim
56 words
The system defined in claim 2, further comprising a second power-supply means having a source, a condenser and a controlled rectifier essentially corresponding to those of the first-mentioned power-supply means and connected in parallel therewith to said electrodes for delivering a succession of machining pulses thereto intermediate the machining pulses delivered by said first power-supply means.
Claim 9
Dependent Claim
39 words
The system defined in claim 9, further comprising control means responsive to the decay of the machining pulses of said first power-supply means for triggering the controlled rectifier of said second power-supply means to initiate the machining pulses thereof.
Claim 10
Independent Claim
84 words
A method of electrochemically machining a metallic workpiece constituting a first electrode, comprising the steps of spacedly juxtaposing said first electrode with a second electrode across a machining gap; introducing an electrolyte coolant into said gap; intermittently charging a current-storage impedance over relatively long intervals; and intermittently discharging said impedance between said relatively long intervals over relatively short machining intervals across said electrodes to apply therethrough unidirectional machining pulses of a current amplitude substantially above the current amplitude of the charging of said condenser.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |