Method for the hydromechanical drawing of workpieces
Abstract
Abstract CIRCULAR AND OTHER BLANK OF SHEET METAL AND THE LIKE WORKPIECES ARE SHAPED BY HYDROMECHANICAL DRAWING WITH THE AID OF A RIGID CONTAINER FOR LIQUID, A LIQUID DISPLACING PLUNGER OF TUBULAR SHAPE WHICH IS MOVABLE RELATIVE TO THE CONTAINER, AND A SHAPING DIE HAVING A CAVITY CORRESPONDING TO THE SHAPE TO BE IMPARTED TO THE WORKPIECE. AFTER FILLING THE CONTAINER WITH LIQUID UP TO ITS RIM, THE BLANK IS PLACED ON TOP OF THE PLUNGER AND THE DIE IS PLACED ON TOP OF THE BLANK WITH THE DIE FACING THE BLANK. THEN THE DIE AND THE BLANK ARE PRESSED AGAINST THE CONTAINER THUS SEALING THE CONTAINER AND FORCING THE PLUNGER INTO THE CONTAINER. THIS INCREASES THE LIQUID PRESSURE AND DRAWS THE BLANK INTO THE DIE CAVITY.
Inventors
- 👤 Eugen Burk
Bibliographic Details
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |