Plastic cartridge case for artillery shot
View Patent ↗The invention relates to ammunition, in particular to the construction of composite artillery cartridge cases and can find wide application in the production of general cartridge cases with plastic main body for artillery shots with split-cartridges and unitary loading. The abovementioned cartridge case contain a metal bottom and a plastic body fixed to it, centrally in the metal bottom is made a cylindrically shaped protrusion in which a stepped hole is formed, in which a primer for artillery cartridges is mounted by means of a threaded connection, as at the metal bottom of a plastic main body is placed a mounting ring. In the metal bottom 1 at least two blind holes are formed, with a diameter equal to 0.1 to 0.25 of the diameter of the metal bottom 1 and a depth of 0.35 to 0.5 of the thickness of the bottom of the metal bottom 1 , and in the bottom of the plastic main body 2 are formed at least two protruding, fixing elements 6.
1 . A composite artillery cartridge case containing a metal bottom and a plastic body fixed to the metal bottom, the metal bottom includes a cylindrically shaped protrusion which includes a stepped hole, in which a primer for artillery cartridges is mounted by means of a threaded connection, as the metal bottom and the plastic body ( 3 ) are connected by a clamping fastening ring ( 4 ), and between the bottom of the plastic body ( 3 ) and the lower surface of the clamping fastening ring ( 4 ) is placed a sealing pad, characterized in that the metal bottom ( 1 ), is provided with inner radius and in which at least two blind holes are formed, with a diameter equal to 0.1 to 0.25 of the diameter of the metal bottom ( 1 ), and a depth of 0.35 to 0.5 of the thickness of the bottom of the metal bottom ( 1 ), and in the bottom of the plastic body ( 3 ) are formed at least two protruding, fixing elements ( 6 ), with a diameter equal from 0.1 to 0.25 of the diameter of the metal bottom ( 1 ), as the blind holes and the protruding fixing elements correspond in shape, size and location, whereby in the cylindrically shaped protrusion ( 6 ) of the metal bottom ( 1 ) threaded sector is made.
2 . The composite artillery cartridge case according to claim 1 , characterized in that the ratio between the outer diameter of the clamping fastening ring ( 4 ) and the diameter of the metal bottom ( 1 ) under the flange is in a range of 0.66 to 0.87, and the ratio between the thickness of the clamping fastening ring ( 4 ) and the thickness of the metal bottom ( 1 ) is in a range of 0.35 to 0.7.
3 . The composite artillery cartridge case according to claim 1 , characterized in that the clamping fastening ring ( 4 ) has a central threaded hole with a size corresponding to the threaded sector made on the cylindrically shaped protrusion ( 6 ) of the metal bottom ( 1 ) with diameter D, and wherein the clamping fastening ring ( 4 ) includes at least two holes ( 5 ).
4 . The composite artillery cartridge case according to claim 1 , characterized in that the outer radius R of a side surface of the plastic body ( 3 ) with its bottom is made with a radius of 0.6 to 1.3 of the inner radius of the metal bottom ( 1 ).
5 . The composite artillery cartridge case according to claim 1 , characterized in that an antistatic graphite coating is applied to the inner surface of the plastic body ( 3 ).
6 . The composite artillery cartridge case according to claim 1 , characterized in that the plastic body ( 3 ) of the cartridge case is made of plastic, which contains an antistatic substance.
7 . The composite artillery cartridge case according to claim 1 , characterized in that a protective zinc-phosphate or chromium coating with a thickness of not less than 7 μm is applied to the metal parts of the cartridge case.
8 . The composite artillery cartridge case according to claim 1 , characterized in that the plastic body ( 3 ) of the cartridge case is made of low pressure polyethylene and high density.