US4468945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Friction-actuated extrusion
Assignee: Balfour Beatty PLC
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Filing: 1982-07-19
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Granted: 1984-09-04
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Expires: 2002-07-19
Abstract
Abstract In continuous friction-actuated extrusion, especially Conform extrusion of copper, at least part of the tooling is made from aged nickel-chromium base alloy (which is preferably cold-worked before aging to give a yield strength of at least 1500 MN/m 2 at 20° C.) and which is capable of sustaining an adherent oxide film. The preferred alloy is "Inconel Alloy 718". Despite lower hardness, the tooling has better service life than conventional special-steel tooling.
Inventors
- 👤 Norman R. Fairey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:20
CPC Classifications
B; B21; B21C; B21C23/00; B21C25/00; B21C25/02; B21C25/025; B21C23/005
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
40 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from aged nickel-chromium base alloy with a yield strength of at least 1000 MN/m 2 at 20° C. ( at 0.2% offset) and having an oxide film.
Claim 2
Dependent Claim
40 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from aged nickel-chromium base alloy with a yield strength of at least 1000 MN/m 2 at 20° C. ( at 0.2% offset) and having an oxide film.
Claim 3
Dependent Claim
46 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from a cold-worked and aged nickel-chromium base alloy with a yield strength (after coldwork and aging) of at least 1500 MN/m 2 at 20° C. (at 0.2% offset) and having an oxide film.
Claim 4
Dependent Claim
46 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from a cold-worked and aged nickel-chromium base alloy with a yield strength (after coldwork and aging) of at least 1500 MN/m 2 at 20° C. (at 0.2% offset) and having an oxide film.
Claim 5
Dependent Claim
47 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from a cold-worked and aged nickel-chromium base alloy with a yield strength (after cold work and aging) of at least 1600 MN/m 2 at 20° C. (at 0.2% offset) and having an oxide film.
Claim 6
Dependent Claim
47 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from a cold-worked and aged nickel-chromium base alloy with a yield strength (after cold work and aging) of at least 1600 MN/m 2 at 20° C. (at 0.2% offset) and having an oxide film.
Claim 7
Dependent Claim
28 words
Apparatus as claimed in any one of claims 2 or 3 in which the alloy is an austenitic nickel-chromium-iron alloy age hardened by precipitation of a gamma-prime phase.
Claim 8
Dependent Claim
34 words
Apparatus as claimed in claim 4 in which the austenitic alloy has the composition Nickel 49-55%, Chromium 17-21%, Niobium and/or Tantalum 4.75-5.5%, Molybdenum 2.8-3.3%, Titanium 0.65-1.15%, Aluminium 0.2-0.0.8%, balance Iron apart from incidental impurities.
Claim 9
Dependent Claim
55 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from aged nickel-chromium base alloy with a yield strength of at least 1000 MN/m 2 at 20° C. (at 0.2% offset) and having an oxide film, wherein the alloy is an austenitic nickel-chromium-iron alloy age hardened by precipitation of a gamma-prime phase.
Claim 10
Dependent Claim
55 words
Apparatus for continuous friction-actuated extrusion characterised by tooling made at least in part from aged nickel-chromium base alloy with a yield strength of at least 1000 MN/m 2 at 20° C. (at 0.2% offset) and having an oxide film, wherein the alloy is an austenitic nickel-chromium-iron alloy age hardened by precipitation of a gamma-prime phase.
Claim 11
Dependent Claim
34 words
Apparatus as claimed in claim 6 in which the austenitic alloy has the composition Nickel 49-55%, Chromium 17-21%, Niobium and/or Tantalum 4.75-5.5%, Molybdenum 2.8-3.3%, Titanium 0.65-1.15%, Aluminum 0.2-0.0.8%, balance Iron apart from incidental impurities.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |