US3680381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for forming parts with re-entrant surfaces
Assignee: FORGES DE BOLOGNE SA
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Filing: 1970-11-23
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Granted: 1972-08-01
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Expires: 1990-11-23
Abstract
Abstract A turbine or compressor blade with projections adjacent each end having one or more arcuate re-entrant surfaces is initially forged and is finish formed, either hot or cold, in a mould which defines the aerodynamic portion of the blade. The projections are finish formed by punches and after retraction of the punches, the mould halves are separated by a pivotal movement about an axis which contains the center of curvature of the arcuate re-entrant surfaces thus enabling the formed blade to be removed.
Inventors
- 👤 Pierre Portal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:57
CPC Classifications
B; B21; B21K; B21K3/00; B21K3/04; B21J; B21J5/00; B21J5/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A method of finish forming an elongate forged part having a main portion and a lateral projection aDjacent each end thereof, each said lateral projection having at least one laterally extending surface of arcuate form, the center of radius of which surfaces lies on the longitudinal axis of the part, said method comprising the steps of confining a forged blank of the part in a space defining the final dimensions of the main portion of the part, said space being defined by mold parts movable towards and away from one another along an arcuate path the center of which coincides with the center of radius of the laterally extending arcuate surfaces, applying pressure endwise of the blank to form said projections with their arcuate surfaces, releasing said pressure, and moving the mold parts relatively to one another along said arcuate path whereby to release the elongate part in its final dimensions.
Claim 2
Independent Claim
151 words
A method of finish forming an elongate forged part having a main portion and a lateral projection aDjacent each end thereof, each said lateral projection having at least one laterally extending surface of arcuate form, the center of radius of which surfaces lies on the longitudinal axis of the part, said method comprising the steps of confining a forged blank of the part in a space defining the final dimensions of the main portion of the part, said space being defined by mold parts movable towards and away from one another along an arcuate path the center of which coincides with the center of radius of the laterally extending arcuate surfaces, applying pressure endwise of the blank to form said projections with their arcuate surfaces, releasing said pressure, and moving the mold parts relatively to one another along said arcuate path whereby to release the elongate part in its final dimensions.
Claim 3
Dependent Claim
114 words
Apparatus for finish forming a forged part having at least one re-entrant surface on at least one lateral projection thereof said apparatus comprising two mold members, each having formed therein depressions corresponding to a portion of the finish-formed part, and at least one recess leading to that portion of the depression which defines the re-entrant surface, means pivotally connecting the mold members, a punch slidable in said recess to engage the projection and form the re-entrant surface, a fluid-operated actuator for operating the punch, and means for pivoting the mold parts about an axis containing the center of the arcuate surface whereby the finish formed part can be removed along a corresponding arcuate path.
Claim 4
Dependent Claim
114 words
Apparatus for finish forming a forged part having at least one re-entrant surface on at least one lateral projection thereof said apparatus comprising two mold members, each having formed therein depressions corresponding to a portion of the finish-formed part, and at least one recess leading to that portion of the depression which defines the re-entrant surface, means pivotally connecting the mold members, a punch slidable in said recess to engage the projection and form the re-entrant surface, a fluid-operated actuator for operating the punch, and means for pivoting the mold parts about an axis containing the center of the arcuate surface whereby the finish formed part can be removed along a corresponding arcuate path.
References Cited (Backward Citations)
US1910943A
Cited
US2751667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |