Aluminum cartridge case

Details Aluminum cartridge case Aluminum cartridge case

1975-08-22

1976-10-05

Stallard, W.

Metal treatment

Compositions

Heat treating

C22F 104

Patent

active

039842592

ABSTRACT:
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.

REFERENCES:
patent: 2220652 (1940-11-01), Irmann
patent: 2736085 (1956-02-01), Parre
patent: 3498221 (1970-03-01), Hilton et al.
patent: 3614816 (1971-10-01), Weyhmuller
patent: 3761322 (1973-09-01), Winter et al.
patent: 3765297 (1973-10-01), Skochko et al.
patent: 3791880 (1974-02-01), Hunsicker et al.
patent: 3802931 (1974-04-01), Bylund

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