Forging method for producing a hollow body
Abstract
Abstract A COMPOUND ANNULAR BODY IS PRODUCED BY A FORGING OPERATION. INNER AND OUTER ANNULAR BODIES ARE TELESCOPICALLY ENGAGED ONE WITHIN THE OTHER, AND ARE PLACED WITHIN AN ANNULAR DIE HAVING RADIALLY OUTWARDLY EXTENDING PERIPHERALLY SPACED RECESSES. THE MATERIAL OF THE INNER ANNULAR MEMBER HAS A HIGHER MALLEABILITY THAN THAT OF THE OUTER ANNULAR MEMBER. AXIAL PRESSURE IS APPLIED TO THE CLOSELY FITTED ANNULAR MEMBERS IN THE DIE TO FORCE THE MATERIAL OF THE OUTER MEMBER INTO THE RECESSES TO FORM PROJECTIONS, AND TO FORCE THE MATERIAL OF THE INNER MEMBER INTO RECESSES IN THE INNER PERIPHERY OF THE OUTER MEMBER, THESE LATTER RECESSES RESULTING FROM THE RADIALLY OUTWARDLY DEFORMATION OF THE OUTER MEMBER. THE INNER AND OUTER MEMBERS ARE THUS INTERLOCKED AGAINST BOTH AXIAL AND ANGULAR RELATIVE DISPLACEMENT. THE TWO MATERIALS MAY BE METALLIC MATERIALS OR THE OUTER MEMBER MAY BE A METALLIC MATERIAL AND THE INNER MEMBER A SYNTHETIC RESIN MATERIAL. THE FORGING OPERATION MAY BE EITHER A HOT FORGING OPERATION OR A COLD FORGING OPERATION.
Inventors
- 👤 Toru Yamada
- 👤 Senjyo Kitajima
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |