Apparatus and method for forming grooves and lands
Abstract
Abstract An electrochemical machine apparatus for forming relatively shallow lands and grooves on the relatively smooth interior surfaces bore of a tubular member, e.g., forming rifling in a gun barrel, includes a tool advanceable into the tubular workpiece while electrolyte is pumped between the tool and the interior surface of the workpiece. The outer peripheral surface of the tool includes a bore sizing and finish machining surface and an associated segmented groove machining and groove finishing surface which is integral therewith. The bore finishing surfaces machines the interior surface of the bore to a predetermined dimension and is followed in the direction of tool travel by the segmented groove machining surface which forms grooves in the bore to a predetermined diameter greater than the predetermined bore dimension and separated by lands having a diameter equal to the predetermined bore dimension. By rotating the tool during its advancement spiral lands and grooves may be formed. The tool is supported by guides during its travel through the bore of the workpiece, the electrolyte flowing in the same direction that the tool is advancing.
Inventors
- 👤 W Haggerty
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |