IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0606845
(1975-08-22)
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발명자
/ 주소 |
- Rogers
- Jr. Ralph W. (New Kensington PA) Deveney Charles H. (Lower Burrell PA) Johnson Edsel W. (Gibsonia PA)
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| 출원인 / 주소 |
- Aluminum Company of America (Pittsburgh PA 02)
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| 인용정보 |
피인용 횟수 :
19 인용 특허 :
0 |
초록
▼
An improved cartridge case is fabricated from rod or bar stock formed from a billet of an alloy containing, by weight, 5.2 to 6.2% Zn, 1.9 to 2.5% Mg, 1.2 to 1.9% Cu, 0.18 to 0.25% Cr, the remainder essentially aluminum. The method of fabrication of the cartridge case from a billet of the alloy comp
An improved cartridge case is fabricated from rod or bar stock formed from a billet of an alloy containing, by weight, 5.2 to 6.2% Zn, 1.9 to 2.5% Mg, 1.2 to 1.9% Cu, 0.18 to 0.25% Cr, the remainder essentially aluminum. The method of fabrication of the cartridge case from a billet of the alloy comprises a controlled sequence of steps in forming rod or bar working stock so as to ensure against the formation of coarse recrystallized grains and the consequent forming of surface cracks or checks in subsequent metal working operations which include segmenting the rod, annealing the segmented parts and thereafter forming such segments into cartridge cases by cupping and wall ironing procedures. The mouth of the case can be annealed for ease of forming a retaining groove about a projectile positioned in the mouth of the case and in some instances for providing resistance to stress corrosion cracking.
대표청구항
▼
A method of fabricating an improved aluminum cartridge case comprising: a. providing a body of aluminum alloy consisting essentially of, by weight, 5.2 to 6.2% Zn, 1.9 to 2.5% Mg, 1.2 to 1.9% Cu, 0.18 to 0.25% Cr, the balance essentially aluminum, b. homogenizing said body of subjecting it to a temp
A method of fabricating an improved aluminum cartridge case comprising: a. providing a body of aluminum alloy consisting essentially of, by weight, 5.2 to 6.2% Zn, 1.9 to 2.5% Mg, 1.2 to 1.9% Cu, 0.18 to 0.25% Cr, the balance essentially aluminum, b. homogenizing said body of subjecting it to a temperature of 800°to 890°F for a period of 4 to 12 hours, c. following said homogenizing, thermally treating said body at a temperature of 940°F to 1000°F for a period of 6 to 48 hours, d. extruding said body at a temperature of 550°to 800°F to rod or bar, e. annealing said extruded body, f. fabricating said rod or bar into cartridge cases by operations including dividing the rod or bar into segments, impact extruding said segments, theReafter drawing, ironing, and necking a portion to form to a cartridge case configuration, said operations including intermediate anneals with controlled cooling rates, and subsequently solution heat treating, quenching, and artificially aging said cartridge case.
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