US3755645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Maximum average gap voltage control for edm power supply
Assignee: Milacron Inc
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Filing: 1972-04-21
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Granted: 1973-08-28
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Expires: 1992-04-21
Abstract
Abstract A gap sensing circuit in conjunction with an inhibit circuit defines apparatus for maintaining the average voltage across the gap between an electrode tool and workpiece of an EDM mechanism within a predetermined maximum level. The gap sensing circuit monitors the peak voltage present across the gap, and enables an inhibit circuit to produce a signal suppressing the production of sustained machining pulses when the average voltage across the gap exceeds a predetermined maximum level. The sensing network disables the inhibit circuit when the gap voltage returns to an acceptable level.
Inventors
- 👤 H Kauffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:57
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
94 words
In an electrical discharge machine apparatus having a power supply for producing machining discharges across a gap between electrodes including a conductive tool and a conductive workpiece, and a servo-means for feeding the tool and workpiece relative to each other at a predetermined feed rate an improvement comprising: a. first means for producing an output when the gap voltage exceeds a predetermined maximum average level; and b. second means responsive to said output for inhibiting the application of pulses to the gap during the period the gap voltage exceeds said predetermined maximum average level.
Claim 2
Dependent Claim
94 words
In an electrical discharge machine apparatus having a power supply for producing machining discharges across a gap between electrodes including a conductive tool and a conductive workpiece, and a servo-means for feeding the tool and workpiece relative to each other at a predetermined feed rate an improvement comprising: a. first means for producing an output when the gap voltage exceeds a predetermined maximum average level; and b. second means responsive to said output for inhibiting the application of pulses to the gap during the period the gap voltage exceeds said predetermined maximum average level.
Claim 3
Dependent Claim
47 words
The apparatus of claim 1 wherein there is further comprising: a. means for sensing suppression of the pulses to the gap by the inhibiting means; and b. means for maintaining the feed rate of the tool relative to the workpiece at a constant rate in response thereto.
Claim 4
Dependent Claim
51 words
The apparatus of claim 1 wherein there is further included a multivibrator circuit coupled to said inhibiting means and operable to suppress the production of pulses by the power supply for a preset period of time following the sensing of an average gap voltage level in excess of the predetermined maximum.
Claim 5
Dependent Claim
171 words
In an electrical discharge machining apparatus having a power supply for producing machining discharges across a gap between electrodes including a conductive tool and a conductive workpiece, and a servo-means for feeding the tool and the workpiece relative to each other at a predetermined feedrate an improvement comprising: a. means for producing an output when the gap voltage exceeds a predetermined maximum average level; b. means responsive to said output for inhibiting the application of pulses to the gap during the period the gap voltage exceeds the predetermined maximum average level; c. means for sensing suppression of pulses to the gap by said inhibiting means; d. means for maintaining the feed rate between said tool and workpiece while said pulses to the gap are suppressed; and e. a multi-vibrator coupled to said inhibiting means operable to continue the suppression of production of machining discharges at the gap by the power supply for a preset period of time following the sensing of an average voltage level in excess of the predetermined maximum.
Claim 6
Dependent Claim
171 words
In an electrical discharge machining apparatus having a power supply for producing machining discharges across a gap between electrodes including a conductive tool and a conductive workpiece, and a servo-means for feeding the tool and the workpiece relative to each other at a predetermined feedrate an improvement comprising: a. means for producing an output when the gap voltage exceeds a predetermined maximum average level; b. means responsive to said output for inhibiting the application of pulses to the gap during the period the gap voltage exceeds the predetermined maximum average level; c. means for sensing suppression of pulses to the gap by said inhibiting means; d. means for maintaining the feed rate between said tool and workpiece while said pulses to the gap are suppressed; and e. a multi-vibrator coupled to said inhibiting means operable to continue the suppression of production of machining discharges at the gap by the power supply for a preset period of time following the sensing of an average voltage level in excess of the predetermined maximum.
References Cited (Backward Citations)
US3539753A
Cited
US3649802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |