Patent US3851135A successfully refreshed from Google Patents.
US3851135A
Expired / Lapsed
US
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Electrical discharge machining process employing brass electrode, silicone oil dielectric, and controlled voltage pulses
Assignee: Ex-Cell-O Corp
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Filing: 1973-11-09
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Granted: 1974-11-26
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Expires: 1993-11-09
Abstract
Abstract Electrical discharge machining process in which the parameters are controlled to provide higher metal removal rates than heretofore considered possible, together with maintenance of good surface integrity. Specifically, the new process makes use of a brass electrode, a silicone oil dielectric, and a pulsating voltage between the electrode and the workpiece, the pulses of the voltage having a pulse duration ranging from 4 to 200 microseconds and an on time of from 20 to 80 percent of the period of such pulses.
Inventors
- 👤 D Moracz
- 👤 E Stachura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:47
CPC Classifications
B; B23; B23H; B23H1/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
A METHOD FOR ELECTRICAL DISCHARGE MACHINING OF A WORKPIECE WHICH COMPRISES POSITIONING A BRASS ELECTRODE IN CLOSELY SPACED RELTION TO THE WORKPIECE, INJECTING A SILICONE OIL DIELECTRIC UNDER POSITIVE PRESSURE THROUGH SAID ELECTRODE AND AT SAID WORKPIECE, AND APPLYING A PULSATING VOLTAGE BETWEEN SAID ELCTRODE AND SAID WORKPIECE, THE PULSES OF SAID VOLTAGES HAVING
Claim 2
Independent Claim
54 words
A METHOD FOR ELECTRICAL DISCHARGE MACHINING OF A WORKPIECE WHICH COMPRISES POSITIONING A BRASS ELECTRODE IN CLOSELY SPACED RELTION TO THE WORKPIECE, INJECTING A SILICONE OIL DIELECTRIC UNDER POSITIVE PRESSURE THROUGH SAID ELECTRODE AND AT SAID WORKPIECE, AND APPLYING A PULSATING VOLTAGE BETWEEN SAID ELCTRODE AND SAID WORKPIECE, THE PULSES OF SAID VOLTAGES HAVING
Claim 3
Dependent Claim
16 words
The method of claim 1 in which said pulse duration is from 5 to 10 microseconds.
Claim 4
Dependent Claim
19 words
The method of claim 1 in which the peak current is in the range from 6 to 7 amperes.
Claim 5
Dependent Claim
19 words
The method of claim 1 in which the ionization voltage is in the range from 70 to 90 volts.
Claim 6
Dependent Claim
22 words
The method of claim 1 in which said dielectric is under a pressure of from 5 to 10 pounds per square inch.
Claim 7
Dependent Claim
45 words
The method of claim 1 in which said pulse duration is from 5 to 10 microseconds, said peak current is in the range of from 6 to 7 amperes, and the dielectric is under a pressure of from 5 to 10 pounds per square inch.
Claim 8
Independent Claim
76 words
A method for electrical discharge machining of a workpiece which comprises positioning an electrode in closely spaced relation to the workpiece, injecting a liquid dielectric under positive pressure through said electrode and at said workpiece, and applying pulses of electrical voltage between said electrode and said workpiece having a duration in the order of about from 4 to 200 microseconds and an on time of from 20 to 80 percent of the period of the pulses.
Claim 9
Independent Claim
76 words
A method for electrical discharge machining of a workpiece which comprises positioning an electrode in closely spaced relation to the workpiece, injecting a liquid dielectric under positive pressure through said electrode and at said workpiece, and applying pulses of electrical voltage between said electrode and said workpiece having a duration in the order of about from 4 to 200 microseconds and an on time of from 20 to 80 percent of the period of the pulses.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |