Patent US3739136A successfully refreshed from Google Patents.
US3739136A
Expired / Lapsed
US
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Process and apparatus for machining by electro erosion
Assignee: Ateliers des Charmilles SA
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Filing: 1972-03-22
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Granted: 1973-06-12
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Expires: 1992-03-22
Abstract
Abstract A process and installation for machining by electro-erosion, comprising means for measuring the voltage between the electrode and the part to be machined during a discharge, and a device sensitive to the difference between the voltages corresponding to two distinct discharges, this device acting upon the electrical and/or the mechanical control of the installation.
Inventors
- 👤 G Marendaz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:19
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/14; B23H7/18
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
204 words
A machining process by electro-erosion according to which a succession of voltage pulses are applied within the machining gap comprised between an electrode-part to be machined and an electrode-tool intended to trigger the erosive discharges through a machining fluid filling the gap, the discharges being sustained by controlled current pulses, and in which at least one of the following machining parameters are controlled automatically: 1. the characteristic values of said electric voltage and/or current pulses, 2. the physical or chemical conditions of the machining fluid filling the said gap, 3. the spacing of said electrodes, by means of electric signals obtained from measurements of the voltage between the electrodes and/or the current flowing through the latter and/or a combination of both of these signals, wherein repeated measurements are effected of the average level of the voltage between the electrode during the time intervals included between the instants corresponding to the beginning of the current pulses and the instants corresponding to their ending, to memorize the result of these measurements and to act upon at least one of the machining parameters, by means of an electric signal obtained in response to the differences between the results of these measurements from one current pulse to another.
Claim 2
Dependent Claim
204 words
A machining process by electro-erosion according to which a succession of voltage pulses are applied within the machining gap comprised between an electrode-part to be machined and an electrode-tool intended to trigger the erosive discharges through a machining fluid filling the gap, the discharges being sustained by controlled current pulses, and in which at least one of the following machining parameters are controlled automatically: 1. the characteristic values of said electric voltage and/or current pulses, 2. the physical or chemical conditions of the machining fluid filling the said gap, 3. the spacing of said electrodes, by means of electric signals obtained from measurements of the voltage between the electrodes and/or the current flowing through the latter and/or a combination of both of these signals, wherein repeated measurements are effected of the average level of the voltage between the electrode during the time intervals included between the instants corresponding to the beginning of the current pulses and the instants corresponding to their ending, to memorize the result of these measurements and to act upon at least one of the machining parameters, by means of an electric signal obtained in response to the differences between the results of these measurements from one current pulse to another.
Claim 3
Dependent Claim
13 words
the physical or chemical conditions of the machining fluid filling the said gap,
Claim 4
Dependent Claim
13 words
the physical or chemical conditions of the machining fluid filling the said gap,
Claim 5
Dependent Claim
32 words
A process according to claim 1, wherein the elaboration of said signal is provided, starting from the difference between the results of the measurements from one current pulse to the next one.
Claim 6
Dependent Claim
40 words
A process according to claim 1, wherein a predetermined value is given to said electric signal when the difference between the results of the measurements of the voltage from one current pulse to another is greater than a reference difference.
Claim 7
Dependent Claim
114 words
the spacing of said electrodes, by means of electric signals obtained from measurements of the voltage between the electrodes and/or the current flowing through the latter and/or a combination of both of these signals, wherein repeated measurements are effected of the average level of the voltage between the electrode during the time intervals included between the instants corresponding to the beginning of the current pulses and the instants corresponding to their ending, to memorize the result of these measurements and to act upon at least one of the machining parameters, by means of an electric signal obtained in response to the differences between the results of these measurements from one current pulse to another.
Claim 8
Dependent Claim
114 words
the spacing of said electrodes, by means of electric signals obtained from measurements of the voltage between the electrodes and/or the current flowing through the latter and/or a combination of both of these signals, wherein repeated measurements are effected of the average level of the voltage between the electrode during the time intervals included between the instants corresponding to the beginning of the current pulses and the instants corresponding to their ending, to memorize the result of these measurements and to act upon at least one of the machining parameters, by means of an electric signal obtained in response to the differences between the results of these measurements from one current pulse to another.
Claim 9
Dependent Claim
49 words
A process according to claim 1, wherein two predetermined distinct values are given to said electric signal, depending on whether a difference greater than a difference of reference has been detected, respectively not detected, between the results of the measurements of the voltage from one current pulse to another.
Claim 10
Dependent Claim
106 words
Process according to claim 1, wherein action is provided on at least one of the machining parameters, by means of a combination of the said signal, obtained in response to the differences between the results of the measurements of the voltage from a current pulse to another, with at least another signal elaborated in a known manner, starting from the comparison, with a reference value, of the result of the repeated measurements of the average level of the voltage between the electrodes effected during the time intervals included between the instants corresponding to the beginning of the current pulses and the instants corresponding to their ending.
Claim 11
Dependent Claim
83 words
A process according to claim 1, wherein action is provided on at least one of the machining parameters, by means of a combination of said signal, obtained in response to the differences between the results of the measurements of the voltage from a current pulse to another, with at least another signal elaborated from the repeated measurements of the rate of decrease of the voltage between the electrodes the latter measurements being effected at the beginning of the passage of the current pulses.
Claim 12
Dependent Claim
98 words
A process according to claim 1, wherein action is provided on at least one of the machining parameters, by means of a combination of the said signal obtained in response to the differences between the results of the measurements of the voltage from one current pulse to another one, with at least another electric signal elaborated, in a known manner, from the repeated measurements of the voltage between the electrodes, effected during the time intervals included between the instants corresponding to the beginning of the tension pulses and the instants corresponding to the beginning of the current pulses.
Claim 13
Dependent Claim
95 words
A process according to claim 1, wherein action is provided on at least one of the machining parameters, by means of a combination of the said signal obtained in response to the differences between the results of the measurements of the voltage of a current pulse and another one, with at least one other electric signal elaborated from the repeated measurements of the abrupt variations of the voltage between the electrodes, effected at the instants corresponding to the beginning of the voltage pulses, and at the beginning and at the end of the current pulses.
Claim 14
Dependent Claim
115 words
A process according to claim 1, wherein action is provided on at least one of the machining parameters, by means of a combination of the said signal obtained in response to the differences between the results of the measurements of the voltage of a current pulse and another one, with at least one other electric signal elaborated by detecting the abrupt variations of the said voltage occuring during the time intervals included between the instants corresponding to the beginning of the current pulses and the instants corresponding to their ending, exclusive of these instants, this other electric signal being obtained in response to the presence, the absence respectively, of these abrupt variations of the voltage.
Claim 15
Dependent Claim
132 words
An installation for working out the process according to claim 1, wherein first means are comprised, capable of being momentarily rendered sensitive during the passage of said pulses, to the gap voltage and for which the electrical condition is then function of this voltage, these means being further capable of maintaining their preceding electrical conditions for the time intervals during which they are rendered unsensitive to this voltage, and second means are comprised which are sensitive to the electrical condition variations of the first means and designed and disposed in a manner permitting the delivery of a control signal of at least one of the machining parameters, this signal varying with the difference of the electrical conditions of the first means by a time interval during which they are unsensitive to another.
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |