US3848108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Servo feed control for electrical discharge machining
Assignee: Amsted Industries Inc
•
Filing: 1973-11-01
•
Granted: 1974-11-12
•
Expires: 1993-11-01
Abstract
Abstract A servo system for electrical discharge machining processes adapted to regulate a spark-discharge gap in electro-discharge machining. The system includes a gap voltage sensing means, a reference voltage source, and an electrically operated motive means connected therebetween. The gap voltage sensing means senses a scaled down voltage which is proportional to the peak gap voltage resulting from each machining pulse. Sensing of the peak voltage on a per pulse basis provides more responsive control of the servo feed mechanism, thereby maintaining optimum gap spacing between an electrical discharge machining electrode and workpiece.
Inventors
- 👤 E Takarada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:09
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
136 words
In an electrical discharge machining apparatus having pulsing means for delivering intermittent erosive electrical discharges across a dielectric coolant-filled gap between a tool electrode and a workpiece, and further having feed control means for providing relative movement between said electrode and said workpiece; the improvement comprising a servo feed control circuit having an energy storage network connected across said gap, said energy storage network including means for storing a voltage that is proportional to the peak voltage imposed across said gap, and control circuitry for causing said feed control means to operate in response to said stored voltage, said energy storage network further including means for discharging said storage means in response to the output of said pulsing means, thereby discharging said storage means prior to the imposition of the next machining pulse across said gap.
Claim 2
Dependent Claim
136 words
In an electrical discharge machining apparatus having pulsing means for delivering intermittent erosive electrical discharges across a dielectric coolant-filled gap between a tool electrode and a workpiece, and further having feed control means for providing relative movement between said electrode and said workpiece; the improvement comprising a servo feed control circuit having an energy storage network connected across said gap, said energy storage network including means for storing a voltage that is proportional to the peak voltage imposed across said gap, and control circuitry for causing said feed control means to operate in response to said stored voltage, said energy storage network further including means for discharging said storage means in response to the output of said pulsing means, thereby discharging said storage means prior to the imposition of the next machining pulse across said gap.
Claim 3
Dependent Claim
22 words
In an electrical discharge machining apparatus as set forth in claim 1, said means for storing a voltage being a storage capacitor.
Claim 4
Dependent Claim
24 words
In an electrical discharge machining apparatus as set forth in claim 2, said discharge means being a transistor operatively connected across said storage capacitor.
Claim 5
Dependent Claim
127 words
In an electrical discharge machining apparatus having a pulse generator for delivering intermittent erosive electrical discharges across a dielectric coolant-filled gap between a tool electrode and a workpiece, and further having feed control means associated with said electrode for providing relative movement between said electrode and said workpiece in response to a voltage signal; the improvement comprising a storage network having means for storing a voltage signal which is proportional to the peak voltage imposed across said gap during the on-time cycle, said feed control means being responsive to said stored voltage, and wherein said storage network further includes means responsive to the output of said pulse generator for discharging said voltage storage means just prior to the arrival at the gap of the next on-time cycle.
Claim 6
Dependent Claim
127 words
In an electrical discharge machining apparatus having a pulse generator for delivering intermittent erosive electrical discharges across a dielectric coolant-filled gap between a tool electrode and a workpiece, and further having feed control means associated with said electrode for providing relative movement between said electrode and said workpiece in response to a voltage signal; the improvement comprising a storage network having means for storing a voltage signal which is proportional to the peak voltage imposed across said gap during the on-time cycle, said feed control means being responsive to said stored voltage, and wherein said storage network further includes means responsive to the output of said pulse generator for discharging said voltage storage means just prior to the arrival at the gap of the next on-time cycle.
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) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |