Patent US4289443A successfully refreshed from Google Patents.
Patent US4921664A successfully refreshed from Google Patents.
US4921664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a heat-resistant aluminum-alloy workpiece having high transverse ductility which is manufactured from a compact produced by powder metallurgy
Assignee: ABB Asea Brown Boveri Ltd
•
Filing: 1989-02-08
•
Granted: 1990-05-01
•
Expires: 2009-02-08
Abstract
Abstract Method for producing a heat-resistant aluminum-alloy workpiece having high transverse ductility which is manufactured from a compact produced by powder metallurgy, in which alloy powders are first cold-isostatically pressed under a pressure of 1500 to 5000 bar and the extrusion billet (2) produced in this manner is hot-recompacted and extruded to form a bar (7) with rectangular cross-section. Reduction ratio at least 6:1. A prismatic bar section (8) is separated from the bar (7) and is converted without further hot deformation and solely by machining into the final product in a manner such that the mechanical main load directions of the final product position themselves in a plane which is parallel to the plane which is extended through the extrusion direction and the longitudinal axis of the cross-section of the bar (7).
Inventors
- 👤 Malcolm Couper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:57
CPC Classifications
B; B21; B21C; B21C23/00; B21C23/001; B21J; B21J5/00; B22; B22F; B22F3/00; B22F3/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
A method for producing a heat-resistant aluminum alloy workpiece having high transverse ductility, comprising the steps of: (a) compacting by means of compressive force an aluminum alloy powder having the final composition of said workpiece or a mixture of prealloy powders, by cold-isostatically pressing, hot-pressing or a combination of cold-isostatically pressing and hot-pressing said powder or powders to produce an extrusion billet, (b) extruding said billet to form a compact bar having a rectangular cross-section, by applying compressive force to said billet in a direction parallel to the longitudinal axis of said bar and parallel to the direction of compressive force in said compacting step, (c) separating from said bar a disk-shaped prismatic bar section, and (d) machining said prismatic bar section to obtain said workpiece.
Claim 2
Independent Claim
126 words
A method for producing a heat-resistant aluminum alloy workpiece having high transverse ductility, comprising the steps of: (a) compacting by means of compressive force an aluminum alloy powder having the final composition of said workpiece or a mixture of prealloy powders, by cold-isostatically pressing, hot-pressing or a combination of cold-isostatically pressing and hot-pressing said powder or powders to produce an extrusion billet, (b) extruding said billet to form a compact bar having a rectangular cross-section, by applying compressive force to said billet in a direction parallel to the longitudinal axis of said bar and parallel to the direction of compressive force in said compacting step, (c) separating from said bar a disk-shaped prismatic bar section, and (d) machining said prismatic bar section to obtain said workpiece.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein said cold-isostatic pressing is performed under a pressure of 1500 to 5000 bar.
Claim 4
Dependent Claim
19 words
The method of claim 1, wherein a reduction ratio of at least 6:1 is maintained during said extruding step.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein said prismatic bar section is machined without further hot deformation.
Claim 6
Dependent Claim
20 words
The method of claim 1, wherein said machining step comprises a coarse machining step and a subsequent fine machining step.
Claim 7
Dependent Claim
14 words
The method of claim 1, wherein said compacting step is conducted under a vacuum.
Claim 8
Dependent Claim
43 words
The method of claim 1, wherein the ductility, measured as elongation in the tensile test, in a plane parallel to the direction of said compressive force in step (1) and the direction of said compressive force in step (2) is at least 5%.
Claim 9
Dependent Claim
26 words
The method of claim 1, wherein said compacting step comprises cold-isostatically pressing said powder or powders followed by recompacting by hot-pressing to form said extrusion billet.
References Cited (Backward Citations)
EP0019569A1
Cited
EP0022688A1
Cited
US4435213A
Cited
EP0133144A1
Cited
US4702885A
Cited
US4722751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |