Method and device for the manufacture of francis turbine runners
Abstract
Abstract A RE-FINISHED AND ANNEALED FRANCIS-TYPE RUNNER IS FINISHED BY FIRST MACHINING A GUIDE STRUCTURE AND SURFACE ON THE HUB OF THE RUNNER TO SELECTED FINAL DIMENSIONS. SUCH MACHINING IS EFFECTED BY MOUNTING THE CENTER SHAFT OF A MACHINE TOOL SO THAT IT IS COAXIAL WITH THE HUB AND THE RIM OF THE RUNNER AND SO THAT THE FINISHING TOOL CARRIED BY THE MACHINE TOOL IS IN COATING RELATIONSHIP WITH THE GUIDE STRUCTURE AND SURFACE TO BE MACHINED FOR FINISHING. THIS MACHINE TOOL IS THEN REMOVED AND A SECOND MACHINE TOOL IS MOUNTED ON THE GUIDE STRUCTURE AND SURFACE FINISHED WITH THE FIRST MACHINE TOOL. CORRECT LOCATION OF THE SECOND MACHINE TOOL IS EFFECTED BY UTILIZING THE FINISHED AREAS OF THE STRUCTURE AND THE SURFACE AS REFERENCE AREAS. THE SECOND MACHINE TOOL ALSO MOUNTS A FINISHING TOOL BY MEANS OF WHICH FURTHER GUIDE STRUCTURES AND SURFACES ON THE HUB AND THE RIM OF THE RUNNER ARE MACHINED TO SELECTED FINAL DIMENSIONS WHEREUPON THE SECOND MACHINE TOOL IS ALSO REMOVED.
Inventors
- 👤 Arne Herman Lindquist
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |