US4494461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming a thixoforged copper base alloy cartridge casing
Assignee: Olin Corp
•
Filing: 1982-01-06
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Granted: 1985-01-22
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Expires: 2002-01-06
Abstract
Abstract A process and apparatus for forming a thin-walled, elongated member having superior strength properties from an age hardenable copper base alloy is described herein. A slug or billet of a slurry cast, age hardenable copper base alloy is formed into a semi-solid slurry having about 10% to about 30% of the alloy in a liquid phase. The semi-solid slurry is then thixoforged to form the thin-walled, elongated member. Thereafter, the member is age hardened to provide a product having desired strength properties. The process and apparatus of the instant invention may be utilized to form cartridge casings.
Inventors
- 👤 Michael J. Pryor
- 👤 Joseph Winter
- 👤 Jonathan A. Dantzig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:44
CPC Classifications
B; B21; B21J; B21J5/00; B21J5/004; C; C22; C22C; C22C1/00; C22C1/12; Y; Y10; Y10S; Y10S164/00; Y10S164/90
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A cartridge casing comprising: an elongated, thin-walled member formed from an age hardenable copper base alloy; said copper base alloy being in a condition wherein it has been forged from a semi-solid slurry and having a tensile strength of at least about 80 ksi, a yield strength of at least about 65 ksi and a structure comprising a plurality of discrete particles in a solid surrounding metal matrix; said semi-solid slurry comprising said surrounding metal matrix in a molten condition and said discrete particles within said molten matrix.
Claim 2
Dependent Claim
88 words
A cartridge casing comprising: an elongated, thin-walled member formed from an age hardenable copper base alloy; said copper base alloy being in a condition wherein it has been forged from a semi-solid slurry and having a tensile strength of at least about 80 ksi, a yield strength of at least about 65 ksi and a structure comprising a plurality of discrete particles in a solid surrounding metal matrix; said semi-solid slurry comprising said surrounding metal matrix in a molten condition and said discrete particles within said molten matrix.
Claim 3
Dependent Claim
15 words
The cartridge casing of claim 1 further comprising: said member having a cup-shaped internal cavity.
Claim 4
Dependent Claim
31 words
The cartridge casing of claim 1 wherein: said copper base alloy consists essentially of: about 3% to about 20% nickel, about 5% to about 10% aluminum and the remainder essentially copper.
Claim 5
Dependent Claim
30 words
The cartridge casing of claim 3 wherein: said copper base consists essentially of: about 5% to about 15% nickel, about 6% to about 9% aluminum, and the remainder essentially copper.
Claim 6
Dependent Claim
31 words
The cartridge casing of claim 1 wherein: said copper base alloy consists essentially of: about 8% to about 15% nickel, about 6% to about 9% aluminum, and the remainder essentially copper.
Claim 7
Dependent Claim
25 words
The cartridge casing of claim 5 wherein: said copper base alloy consists essentially of: about 10% nickel, about 71/2% aluminum, and the remainder essentially copper.
Claim 8
Dependent Claim
17 words
The cartridge casing of claim 1 wherein: said copper base alloy is in an age hardened condition.
Claim 9
Dependent Claim
15 words
The cartridge casing of claim 1 wherein: said discrete particles having a generally spheroidal shape.
Claim 10
Dependent Claim
13 words
The cartridge casing of claim 8 wherein said discrete particles comprise degenerate dendrites.
Claim 11
Dependent Claim
43 words
The cartridge casing of claim 1 further comprising: a first aperture at a first end of said member; and a second aperture smaller than said first aperture at a second end of said member, said second end being opposed to said first end.
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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) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |