Patent US3710067A successfully refreshed from Google Patents.
US3710067A
Expired / Lapsed
US
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Method and apparatus for widening the field of application of electro-erosion machining amd improving the conditions arising in the work gap
Assignee: Agie Charmilles SA
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Filing: 1970-12-28
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Granted: 1973-01-09
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Expires: 1990-12-28
Abstract
Abstract There is disclosed a method and apparatus for widening the field of application of electro-erosion machining techniques and for improving the conditions which arise in the work gap, this work gap being constituted by at least one tool electrode and at least one workpiece electrode and contains a liquid and/or gaseous medium. At least one generator is provided for delivering an operating voltage to the work gap. According to an important aspect of the present invention, a magnetic field is superimposed at the work gap upon the operating voltage, the magnetic lines of force of which magnetic field are situated essentially perpendicular to the erosion front.
Inventors
- 👤 C Tadini
- 👤 R Farinelli
- 👤 W Ullmann
- 👤 R Derighetti
- 👤 S Mettei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:09
CPC Classifications
B; B23; B23H; B23H7/00; B23H7/38
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
114 words
A method for electro-erosion machining and for improving the flushing conditions occuring at the work gap, which work gap is formed of at least one tool electrode and at least one workpiece electrode and contains a liquid and/or gaseous medium, with at least one generator serving to deliver an operating voltage to the work gap, the improvement comprising the steps of superimposing a magnetic field at the work gap upon the operating voltage, the lines of force of said magnetic field being situated essentially perpendicular to the erosion front and increasing the intensity of said magnetic field in order to increase the width of said work gap for a given set of discharge parameters.
Claim 2
Independent Claim
114 words
A method for electro-erosion machining and for improving the flushing conditions occuring at the work gap, which work gap is formed of at least one tool electrode and at least one workpiece electrode and contains a liquid and/or gaseous medium, with at least one generator serving to deliver an operating voltage to the work gap, the improvement comprising the steps of superimposing a magnetic field at the work gap upon the operating voltage, the lines of force of said magnetic field being situated essentially perpendicular to the erosion front and increasing the intensity of said magnetic field in order to increase the width of said work gap for a given set of discharge parameters.
Claim 3
Dependent Claim
59 words
The method as defined in claim 1, further comprising the steps of generating the magnetic field in the work gap such that its lines of force are disposed essentially parallel to the feed direction of the tool electrode and workpiece electrode, and controlling the width of the frontal work gap by means of the intensity of the magnetic field.
Claim 4
Dependent Claim
61 words
The method as defined in claim 1, further including the step of generating the magnetic field at the work gap in such a manner that its lines of force are essentially perpendicular to the feed direction of the tool electrode and workpiece electrode, and controlling the width of the lateral work gap by means of the intensity of the magnetic field.
Claim 5
Dependent Claim
48 words
The method as defined in claim 1, further including the step of generating the magnetic field at the work gap in such a manner that its lines of force essentially enclose an angle of maximum 90* with the feed direction of the tool electrode and the workpiece electrode.
Claim 6
Dependent Claim
44 words
The method as defined in claim 1, including the step of adjusting the intensity of the magnetic field at the work gap in such a manner that the same tool electrode can be used for coarse machining operations, pre-finishing machining operations and finishing operations.
Claim 7
Dependent Claim
40 words
The method as defined in claim 1, further including the step of altering the intensity of the magnetic field during the machining operation so that a cylindrical tool electrode produces a recess of a different shape in the workpiece electrode.
Claim 8
Dependent Claim
138 words
An electro-erosion machining apparatus comprising at least one tool electrode and at least one workpiece electrode forming therebetween a work gap embodying a frontal work gap and a lateral work gap, means for displacing said tool electrode and workpiece electrode relative to one another, means for delivering an operating voltage to the work gap, and means defining at least one magnetic circuit closed by the work gap and incorporating magnet means for superimposing a magnetic field At the work gap upon the operating voltage, the lines of force of said magnetic field being disposed essentially perpendicular to the erosion front and the intensity of the said magnetic field controlling the width of the work gap whereby for a given set of discharge parameters the work gap would be made wider and flushing of the work gap substantially improved.
Claim 9
Dependent Claim
138 words
An electro-erosion machining apparatus comprising at least one tool electrode and at least one workpiece electrode forming therebetween a work gap embodying a frontal work gap and a lateral work gap, means for displacing said tool electrode and workpiece electrode relative to one another, means for delivering an operating voltage to the work gap, and means defining at least one magnetic circuit closed by the work gap and incorporating magnet means for superimposing a magnetic field At the work gap upon the operating voltage, the lines of force of said magnetic field being disposed essentially perpendicular to the erosion front and the intensity of the said magnetic field controlling the width of the work gap whereby for a given set of discharge parameters the work gap would be made wider and flushing of the work gap substantially improved.
Claim 10
Dependent Claim
17 words
The apparatus as defined in claim 7, wherein said magnet means comprises at least one electromagnetic coil.
Claim 11
Dependent Claim
17 words
The apparatus as defined in claim 7, wherein said magnet means comprises at least one permanent magnet.
Claim 12
Dependent Claim
43 words
The apparatus as defined in claim 7, wherein said magnet means is arranged about one of said electrodes so that the magnetic field of the frontal work gap is essentially parallel to the feed direction of the tool electrode and the workpiece electrode.
Claim 13
Dependent Claim
44 words
The apparatus as defined in claim 7, wherein said magnet means is arranged at least in one of said electrodes such that the magnetic field of the frontal work gap is essentially parallel to the feed direction of the tool electrode and workpiece electrode.
Claim 14
Dependent Claim
43 words
The apparatus as defined in claim 7, wherein said magnet means is arranged about one of said electrodes such that the magnetic field at the lateral work gap is essentially perpendicular to the feed direction of the tool electrode and the workpiece electrode.
Claim 15
Dependent Claim
48 words
The apparatus as defined in claim 7, wherein said magnet means is arranged at least in one of said electrodes in such a manner that the magnetic field of the lateral work gap is essentially perpendicular to the feed direction of the tool electrode and the workpiece electrode.
Claim 16
Dependent Claim
32 words
The apparatus as defined in claim 7, further including ferromagnetic material arranged at the region of the work gap for the practically loss-free introduction of the magnetic field at the work gap.
Claim 17
Dependent Claim
23 words
The apparatus as defined in claim 10, wherein the tool electrode embodies a layer formed of magnetic material and contains a ferromagnetic filling.
Claim 18
Dependent Claim
20 words
The apparatus as defined in claim 15, wherein the magnetic material is a substance selected from paramagnetic and diamagnetic materials.
Claim 19
Dependent Claim
41 words
The apparatus as defined in claim 14, wherein said tool electrode consists of a plurality of substantially cylindrical shaped tubes arranged in substantial parallelism to one another and formed of a magnetic material, each tube being filled with a ferromagnetic material.
Claim 20
Dependent Claim
20 words
The apparatus as defined in claim 17, wherein said magnetic material is a substance selected from paramagnetic and diamagnetic materials.
Claim 21
Dependent Claim
42 words
The apparatus as defined in claim 14, wherein said tool electrode consists of a plurality of substantially cylindrical shaped rod members arranged in substantial parallelism to one another and formed of ferromagnetic material, each rod member being coated with a magnetic material.
Claim 22
Dependent Claim
24 words
The apparatus as defined in claim 19, wherein the coating material is a substance selected from the group consisting of paramagnetic and diamagnetic materials.
Claim 23
Dependent Claim
48 words
The apparatus as defined in claim 17, further including a holding mechanism in the form of frame means surrounding said tubes at the ends thereof facing away from the workpiece electrode, said frame means being formed of ferromagnetic material and serving as the support for the magnet means.
Claim 24
Dependent Claim
49 words
The apparatus as defined in claim 19, further including a holding mechanism in the form of frame means surrounding said rod members at the ends thereof facing away from the workpiece electrode, said frame means being formed of ferromagnetic material and serving as the support for the magnet means.
Claim 25
Dependent Claim
47 words
The apparatus as defined in claim 7, further including magnetic chuck means for attaching one of said electrodes, said magnet means comprising an electromagnetic coil arranged at said magnetic chuck, said electromagnetic coil eliminating stray magnetic fields and generating a uniform magnetic field at the work gap.
Claim 26
Dependent Claim
23 words
The apparatus as defined in claim 7, wherein a fluid medium is proVided for the work gap which is enriched with ferromagnetic particles.
Claim 27
Dependent Claim
37 words
The apparatus as defined in claim 7, wherein said magnet means comprises an electromagnetic coil, supply lines connectible with a direct-current voltage source and electrically coupled with said electromagnetic coil for generating a uniform static magnetic field.
Claim 28
Dependent Claim
56 words
The apparatus as defined in claim 7, wherein said magnet means comprises an electromagnetic coil, and supply lines for said electromagnetic coil coupled with an alternating-current voltage source for generating an alternating magnetic field, the frequency of which is in the order of magnitude of the frequency of the work pulses arriving at the work gap.
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) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |