Patent US3828628A successfully refreshed from Google Patents.
US3828628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of extruding helical gear blanks
Assignee: Peugeot & Renault
•
Filing: 1973-07-12
•
Granted: 1974-08-13
•
Expires: 1993-07-12
Abstract
Abstract Method of manufacturing helical gear blanks by cold extrusion, characterized in that it comprises the steps of passing successive billets through a die formed with internal helical teeth in order to impress these internal helical teeth by extrusion in the billet for forming external helical teeth in the cylindrical surface of said billets, said billets being driven through said die by a punch adapted to rotate freely.
Inventors
- 👤 Y Roger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:05
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/10; B21C23/00; B21C23/02; B21C23/04; B21C23/08; B21C23/10; B21K; B21K1/00; B21K1/28; B21K1/30; B21K1/305; B21K5/00; B21K5/20
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A method of manufacturing a composite die which is capable of producing helical gear blanks by cold extrusion of successive billets through the die comprising a. binding or ring mounting of at least two sleeve-shaped die blank elements disposed in stacked relationship and locked against relative rotation, each element comprising at the lower portion of its bore a frustoconical section for releasing the billet, b. machining by electric current erosion the constant-outline internal teeth in the thus bound and stacked die elements, and c. grinding the outer diameter of the teeth as a succession of internal stepped envelope frustoconical sections consistent with the teeth to be formed in the billet.
Claim 2
Independent Claim
110 words
A method of manufacturing a composite die which is capable of producing helical gear blanks by cold extrusion of successive billets through the die comprising a. binding or ring mounting of at least two sleeve-shaped die blank elements disposed in stacked relationship and locked against relative rotation, each element comprising at the lower portion of its bore a frustoconical section for releasing the billet, b. machining by electric current erosion the constant-outline internal teeth in the thus bound and stacked die elements, and c. grinding the outer diameter of the teeth as a succession of internal stepped envelope frustoconical sections consistent with the teeth to be formed in the billet.
Claim 3
Dependent Claim
48 words
A method according to claim 1, wherein each die element comprises a frustoconical extrusion surface connected through a so-called neck portion to a reverse cone provided for releasing the billet, the input diameter of the extrusion cone being slightly greater than the neck diameter of the preceding element.
Claim 4
Dependent Claim
29 words
A method according to claim 2, wherein the height of the billet release cone is slightly greater than the height of said billet during its passage through said portion.
Claim 5
Dependent Claim
28 words
A method according to claim 2, wherein the taper of the developed helical generatrix of the tooth tips in the frustoconical extrusion surface ranges from 10* to 20*.
References Cited (Backward Citations)
US2385198A
Cited
US2364005A
Cited
US2598975A
Cited
US2635487A
Cited
US3048060A
Cited
US3293950A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |