Dies and roll manufacture by electroerosion
Abstract
Abstract A METHOD OF FORMING A TUBE REDUCING TOOL COMPRISING THE STEP OF FORMING A TOOL BLANK OF STEEL HAVING A ROLL PORTION AND DRIVE SHAFT PORTION. THE ROLL PORTION IS PROCESSED TO FORM A SERIES OF SPACED ROLL BLANKS ALONG THE LENGTH OF THE TOOL WHICH IS THEN HEAT TREATED TO A HARDENED STATE. THEREAFTER, ELECTRODES ARE POSITIONED IN THE LATERAL TANGENCY TO AND GENERALLY BESIDE THE STELL ROLL BLANKS TO BE MACHINED. THE ELECTRODES ARE THEN CAUSED TO EMIT AN ELECTRICAL SPARK DISCHARGE WHILE CAUSING A TANGENTIAL SURFACE OF THE ROLL BLANKS TO MOVE ALONG THE LENGTH OF THE ELECTRODES ESTABLISHING A CUTTING ZONE ALONG THE TANGETIAL SURFACES OPPOSED TO THE ELECTRODES FORMING TAPERED GROOVES EXTENDING GENERALLY IN ARCUATE DIRECTIONS THEREIN.
Inventors
- 👤 Michael J Celovsky
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |