US4156327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for total form machining of metal
Assignee: EDMUSA Inc A CORP OF MI
•
Filing: 1976-04-12
•
Granted: 1979-05-29
•
Expires: 1996-04-12
Abstract
Abstract The method of abrasion forming friable material such as carbon blocks to form electrical discharge machining electrodes therefrom comprising the steps of moving a master model, having an abrasive surface which is a mirror image of a desired form to be abrasion machined in the friable material, which surface is related in size to the desired form to be machined by an additional movement to be imparted to the master model, toward the friable material with the abrasive surface of the master model and workpiece in engagement while imparting the additional relative motion between the master model and workpiece, which additional relative motion is in all directions in a plane perpendicular to the direction of movement of the master model and workpiece and flushing between the master model and workpiece to prevent build up of abraded particles of the workpiece on the master model.
Inventors
- 👤 Thomas J. O'Connor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:36
CPC Classifications
B; B23; B23H; B23H1/00; B23H1/04; B24; B24B; B24B35/00; B24B35/005
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
The method of total form abrading a desired three dimensional form in carbon or the like comprising supporting an electrically neutral master model having a mirror image three dimensional abrasive surface of a desired form to be machined which mirror image abrasive surface is different in size from the desired form to be machined by a predetermined amount related exactly to an additional relative movement between the master model and workpiece over an electrically neutral workpiece to be abraded into the desired form, relatively moving the master model and workpiece toward and into contact with each other, imparting the additional exact relative movement between the master model and workpiece with the mirror image abrasive surface of the master model and workpiece in engagement, at least part of which additional movement between the master model and workpiece is in all directions in a plane perpendicular to the direction of movement of the master model and workpiece toward each other, and flushing between the mirror image abrasive surface of the master model and the workpiece in the absence of electrical potential and electrical cutting between the mirror image abrasive surface of the master model and workpiece for preventing build up of abraded particles of the workpiece on the master model.
Claim 2
Independent Claim
208 words
The method of total form abrading a desired three dimensional form in carbon or the like comprising supporting an electrically neutral master model having a mirror image three dimensional abrasive surface of a desired form to be machined which mirror image abrasive surface is different in size from the desired form to be machined by a predetermined amount related exactly to an additional relative movement between the master model and workpiece over an electrically neutral workpiece to be abraded into the desired form, relatively moving the master model and workpiece toward and into contact with each other, imparting the additional exact relative movement between the master model and workpiece with the mirror image abrasive surface of the master model and workpiece in engagement, at least part of which additional movement between the master model and workpiece is in all directions in a plane perpendicular to the direction of movement of the master model and workpiece toward each other, and flushing between the mirror image abrasive surface of the master model and the workpiece in the absence of electrical potential and electrical cutting between the mirror image abrasive surface of the master model and workpiece for preventing build up of abraded particles of the workpiece on the master model.
Claim 3
Dependent Claim
21 words
The method as set forth in claim 1 wherein the flushing is accomplished through the abrasive surface of the master model.
Claim 4
Dependent Claim
19 words
The method as set forth in claim 1 wherein the additional relative movement is movement of the master model.
Claim 5
Dependent Claim
30 words
The method as set forth in claim 1 wherein the relative movement of the master model and workpiece toward each other is movement of the master model toward the workpiece.
Claim 6
Dependent Claim
26 words
The method as set forth in claim 1 including first producing the master model to have a mirror image surface of the form to be machined.
Claim 7
Dependent Claim
20 words
Structure as set forth in claim 5 wherein the master model is a female master model and is constructed oversize.
Claim 8
Dependent Claim
31 words
The method as set forth in claim 5 wherein the master model is produced by casting a settable material filled with abrasive over a model of the form to be machined.
References Cited (Backward Citations)
US2452211A
Cited
US3433919A
Cited
US3033298A
Cited
US3135852A
Cited
US3212869A
Cited
US3114029A
Cited
FR1379623A
Cited
US3564190A
Cited
US3322929A
Cited
US3229427A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-28 | 1982-11-27 | 1983-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-28 | 1986-11-27 | 1987-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-28 | 1990-11-27 | 1991-05-29 | $7700.00 | Window Closed / Lapsed |