US4096371A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for electrical discharge machining
Assignee: Individual
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Filing: 1976-07-06
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Granted: 1978-06-20
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Expires: 1996-07-06
Abstract
Abstract A method and tool electrode apparatus for electrical discharge machining. The tool electrode is a segmental electrode having an arcuate periphery in which is provided at least one undercut serration, as a conical undercut serration, around the arcuate periphery thereof. The tool electrode has a portion removed, which portion may take various shapes, so as to provide a longitudinal cutting face having a longitudinal cross section shape commensurate with the cross section shape of a cavity to be cut in a workpiece. The method includes placing the segmental tool electrode with its longitudinal cutting face in an operative position adjacent a workpiece, and then providing relative rotation between the tool electrode and the workpiece to move the tool electrode into and through the workpiece to cut a cavity into the workpiece which has a longitudinal cross section with undercut serrations that is the same as the longitudinal cross section shape of the tool electrode cutting face.
Inventors
- 👤 Garnet W. Lozon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:12
CPC Classifications
B; B23; B23H; B23H9/00; B23H9/006; B23H2400/00; B23H2400/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
158 words
An electrical discharge machining method of machining a cavity having an arcuate outer periphery in a workpiece, including the steps of: a. forming a segmental tool electrode rotatable about its longitudinal axis with an arcuate outer periphery and a longitudinal cutting face having a longitudinal cross section shape commensurate with the longitudinal cross section shape of a cavity to be cut in a workpiece, and with the tool electrode having at least one peripheral undercutting cutting tooth; b. placing the tool electrode with its longitudinal cutting face in an operative position adjacent a workpiece; and, c. providing relative rotation between the tool electrode and the workpiece about the longitudinal axis of the tool electrode to move the tool electrode into the workpiece to cut a cavity with longitudinally extended undercut serrations through the workpiece, and which cavity has a longitudinal cross section that is the same as the longitudinal cross section shape of the tool electrode cutting face.
Claim 2
Dependent Claim
158 words
An electrical discharge machining method of machining a cavity having an arcuate outer periphery in a workpiece, including the steps of: a. forming a segmental tool electrode rotatable about its longitudinal axis with an arcuate outer periphery and a longitudinal cutting face having a longitudinal cross section shape commensurate with the longitudinal cross section shape of a cavity to be cut in a workpiece, and with the tool electrode having at least one peripheral undercutting cutting tooth; b. placing the tool electrode with its longitudinal cutting face in an operative position adjacent a workpiece; and, c. providing relative rotation between the tool electrode and the workpiece about the longitudinal axis of the tool electrode to move the tool electrode into the workpiece to cut a cavity with longitudinally extended undercut serrations through the workpiece, and which cavity has a longitudinal cross section that is the same as the longitudinal cross section shape of the tool electrode cutting face.
Claim 3
Dependent Claim
46 words
An electrical discharge machining method as defined in claim 1, wherein: a. said tool electrode is provided with at least one undercut shaped surface portion on the upperside of said cutting tooth and an inwardly extended shaped surface on the outer periphery of said cutting tooth.
Claim 4
Dependent Claim
30 words
An electrical discharge machining method as defined in claim 1, wherein: a. said tool electrode is provided with at least one conical undercut cutting tooth around the outer periphery thereof.
Claim 5
Dependent Claim
32 words
An electrical discharge machining method as defined in claim 1, wherein: a. said workpiece is held stationary and said tool electrode is rotated into and through said workpiece in a continuous manner.
Claim 6
Dependent Claim
111 words
A tool electrode for electrical discharge machining a cavity in a workpiece by relative rotation between the tool electrode and the workpiece, comprising: a. a body having an arcuate periphery, and an axially extended shaft on one end thereof for attachment to an electrical discharge machining apparatus, and at least one peripheral undercutting cutting tooth; and, b. said body being provided with a longitudinal cutting face having a longitudinal cross section shape commensurate with the longitudinal cross section shape of a cavity to be cut in a workpiece when relative rotation between the tool electrode and the workpiece is effected for moving said cutting face and tool electrode into the workpiece.
Claim 7
Dependent Claim
111 words
A tool electrode for electrical discharge machining a cavity in a workpiece by relative rotation between the tool electrode and the workpiece, comprising: a. a body having an arcuate periphery, and an axially extended shaft on one end thereof for attachment to an electrical discharge machining apparatus, and at least one peripheral undercutting cutting tooth; and, b. said body being provided with a longitudinal cutting face having a longitudinal cross section shape commensurate with the longitudinal cross section shape of a cavity to be cut in a workpiece when relative rotation between the tool electrode and the workpiece is effected for moving said cutting face and tool electrode into the workpiece.
Claim 8
Dependent Claim
30 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said tool electrode is provided with at least one cutting tooth around the outer periphery thereof.
Claim 9
Dependent Claim
28 words
A tool electrode for electrical discharge machining as defined in claim 6, wherein: a. said at least one cutting tooth has an undercut portion on the periphery thereof.
Claim 10
Dependent Claim
25 words
A tool electrode for electrical discharge machining as defined in claim 6, wherein: a. said at least one undercut portion is a conical undercut portion.
Claim 11
Dependent Claim
25 words
A tool electrode for electrical discharge machining as defined in claim 8, wherein: a. said tool electrode includes a plurality of conical undercut cutting teeth.
Claim 12
Dependent Claim
32 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body is half-round in plan view configuration with a straight side that comprises said longitudinal cutting face.
Claim 13
Dependent Claim
38 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body is three-quarters round in plan view configuration with two intersecting straight sides wherein one of said sides comprises said longitudinal cutting face.
Claim 14
Dependent Claim
49 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body has a portion removed to provide a plan view configuration showing an equal sided, right-angled niche in the periphery of the body, with one side of the niche comprising said longitudinal cutting face.
Claim 15
Dependent Claim
49 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body has a portion removed to provide a plan view configuration showing an unequal sided, right-angled niche in the periphery of the body, with one side of the niche comprising said longitudinal cutting face.
Claim 16
Dependent Claim
47 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body has a portion removed to provide a plan view configuration showing a radial slot in the periphery of the body, with one side of said slot comprising said longitudinal cutting face.
Claim 17
Dependent Claim
47 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body has a portion removed to provide a plan view configuration of less than one-half total round configuration, and a chordal face along one side thereof which includes said longitudinal cutting face.
Claim 18
Dependent Claim
47 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body has a portion removed to provide a plan view configuration of more than one-half total round configuration, and a chordal face along one side thereof which includes said longitudinal cutting face.
Claim 19
Dependent Claim
40 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body is less than half-round in plan view configuration with two longitudinal, radial side faces, and one of said faces comprises said longitudinal cutting face.
Claim 20
Dependent Claim
40 words
A tool electrode for electrical discahrge machining as defined in claim 5, wherein: a. said body is less than quarter-round in plan view configuration with two longitudinal, radial side faces, and one of said faces comprises said longitudinal cutting face.
Claim 21
Dependent Claim
46 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body is three-quarters round in plan view configuration with two longitudinal, radial side faces having connected inner arcuate ends, and wherein one of said side faces comprises said longitudinal cutting face.
Claim 22
Dependent Claim
38 words
A tool electrode for electrical discharge machining as defined in claim 5, wherein: a. said body is crescent shaped in plan view configuration with one side being concave arcuate in plan view and including said longitudinal cutting face.
References Cited (Backward Citations)
US2902584A
Cited
US3622734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |