FRAGMENTATION SHELL BODY AND METHOD FOR ITS MANUFACTURE Russian patent published in 2001 - IPC

FIELD: ammunition. SUBSTANCE: the shell body has parallel sections on the external side of the wall, whose lateral surfaces are brought into coincidence without any gap, the sections have a depth of 0.75 to 0.80 of the wall thickness and are made perpendicularly to the body axis, and annular semispherical bosses of the body wall material are made on the inner side of the body wall symmetrically to the sections. The grooves have a depth of 0.55 to 0.60 of the wall thickness, they are made perpendicularly to the body axis at a groove width-to-depth ratio within 0.6 to 1.0; upsetting of the wall material under the grooves is accomplished in a die without the central mandrel inside the body up to the coincidence of the lateral surfaces of each groove, at the same time annular semispherical bosses are formed on the inner side of the body wall. EFFECT: enhanced qualitative structurization of the mass fractions of fragments, and reduced expenditures connected with manufacture of the bodies of fragmentation shells. 2 cl, 3 dwg, 1 tbl, 1 ex