Apparatus and method of forming tubular articles
Abstract
Abstract AN APPARATUS AND METHOD OF FORMING TUBULAR ARTICLES FROM A SOLID SLUG. A FIRST SOLID SLUG IS PLACED ONTO AN OPENENDED DIE BORE AND FORCED ONTO A PIERCING PUNCH DISPOSED WITHIN ONE END OF THE DIE BORE TO FORM A TUBULAR FINISHED PART. THE SLUG IS FORCED ONTO THE PIERCING PUNCH BY A RECIPROCABLE FORGING PUNCH DISPOSED IN THE OTHER END OF THE DIE BORE. IN ADDITION TO THE FIRST SLUG IN PROCESS, THERE IS AT LEAST ONE INTERMEDIATE OR SECOND SLUG DISPOSED IN THE DIE BORE BETWEEN THE PIERCING PUNCH AND THE FORGING PUNCH. THE SECOND SLUG IS PARTIALLY PIECED AS WELL AS RADIALLY EXPANDED WHILE ACTING AS A DEFORMABLE FORGING PUNCH WHEN ADVANCING THE FIRST SLUG. DIRECT LAMINAR METAL GRAIN FLOW IS EFFECTED IN THE TRANSITION FROM SLUG TO FINISHED PART. EACH SLUG HAS A CONE-SHAPED INDENT ON ITS END ADJACENT THE FORGING PUNCH, SUCH INDENT BEING POSITIONED ON THE SLUG LONGITUDINAL AXIS TO EFFECT A CLEAN OPENING THROUGH THE BACK OF THE SLUG BY THE PIERCING PUNCH SUCH THAT THE PIERCING PUNCH DOES NOT CARRY A THIN SKIN OF METAL INTO THE SECOND SLUG.
Inventors
- 👤 Wilfred J Sharon
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |