RU2789488C2 - Fragmentation weapon case - Google Patents

Abstract

FIELD: military equipment.

SUBSTANCE: invention relates to warheads of ammunition with a fragmentation shell of given crushing; it can be used for the manufacture of fragmentation warheads of different calibers of shells, warheads, hand grenades, rifle grenades, mines. The fragmentation weapon case contains a shell, on an inner surface of which localizers of destruction of a saw-shaped profile are made in the form of transverse grooves equipped on a flat side with evenly distributed riffles of a pyramid shape. On an outer surface of the shell, opposite to destruction localizers, removal of a reinforced metal layer – cold hardening is made.

EFFECT: provision of increased yield of useful fragments of a given weight and shape, as well as absence of saber-shaped fragments.

1 cl, 4 dwg

Description

SUBSTANCE: invention relates to warheads of ammunition with fragmentation shells of a given crushing and can be used for the manufacture of fragmentation warheads of various calibers of projectiles, warheads, hand grenades, rifle grenades, mines, and the like.

Ammunition designs are known from the patent literature, the regulation of shell crushing is achieved by forming transverse and longitudinal grooves on it (see, for example, US patents N 406859, nat. cl. 102-67; N 5157225 dated 20.10.92, F42B 12/2; France N 1541334, published 08.26.68, N 154133 dated 05.28.74, N 2685077 dated 12.13.91, F42B 12/24; German applications N 2835557 and N 2919268, 1980, F42B 13/18), which create a sawtooth the profile of the surface of the body, which is destroyed by the pressure of the detonation products of explosives (HE) according to the "gas wedge" scheme. The separation of the shell occurs oriented along the sections weakened by the grooves.

The disadvantage of the known designs is the low efficiency due to the poor aerodynamics of the fragments, which reduces the lethal interval, tk. the fractional composition and shape of the striking elements (with a shape factor greater than 1.5) are in wide limits.

Closest to the claimed invention is the patent of the Russian Federation No. 2080549 "Fragmentation ammunition body", where the regulation of fragmentation of the shell of the ammunition is achieved by forming on its inner surface the localizers of the destruction of a sawtooth profile in the form of transverse grooves, equipped on the flat side with equally distributed corrugations of a multifaceted shape, the base of the pyramidal corrugations is deepened into the shell to the width of the transverse grooves and is aligned with the tops of adjacent grooves of the underlying grooves, the angle at the top of the sawtooth profile of which is made equal to 65-80°.

However, this design, due to the technology of manufacturing the shell of the ammunition, does not completely exclude the formation of agglomerates of fragments (“double”, “triple”) along the axis of the ammunition, which reduce the density of the fragmentation field.

Forged bodies have a crystallographically oriented structure, which leads to anisotropy of mechanical properties in different directions in magnitude. In the tangential direction, the mechanical properties are less than in the longitudinal direction due to the presence of texture, therefore, when such hulls are blown up, the destruction of the shell occurs earlier along the axis, which leads to the appearance of elongated fragments, the so-called. "sabers". In order to exclude this phenomenon, transverse localizers are applied to the hulls in the form of mechanical trimming, or the application of structural grids. For rational division of the transverse rings, longitudinal grooves are applied to them, and the dimensions of the longitudinal and transverse grooves, the step between them is chosen based on the given mass of fragments.

However, the application of one structural grid of longitudinal and transverse localizers only on the inner surface of the housing shell does not exclude the formation of conglomerates of fragments in the longitudinal direction. This is due to the fact that during the manufacture of housing shells by cold pressing by forcing metal through a matrix, a particularly hardened hard-worked metal layer is formed on their outer surface, which partially eliminates the effect of transverse localizers on the inner surface of the housing shell. In this case, the outer diameter of the housing shell is selected in such a way as to exclude, if possible, subsequent machining.

It is proposed to patent a method for manufacturing an ammunition body, when, during the stamping of an internal sawtooth profile, a so-called “wave” is technologically formed on the outer surface of the body, the appearance of which is due to the forcing of metal by multi-stage punches through a specifically selected matrix. At the same time, a work-hardened layer of metal with a thickness of S≈0.5 mm is formed on the outer surface of the body, which has higher mechanical properties to fracture resistance.

The dimensions of the wave are chosen in such a way that during the subsequent machining of the body, in particular the centering thickening of the ammunition, the hard-worked layer is cut off at the junction of the rows of sawtooth notches, thereby creating an additional weakening of the shell in the area of stress concentrators.

An example of a specific implementation of the proposed invention is the design of 30-mm bodies of VOG-30 and VOG-30D grenades, the manufacture of which is carried out in two stages: the manufacture of a stamped semi-finished product with a wave and localizers on the inner surface and the body itself from a semi-finished product by machining it.

In FIG. 1 shows a general view of the semi-finished body; in fig. 2 is a view along A in FIG. 1; in fig. 3 shows a general view of the case; in fig. 4 is a view along B in FIG. 3.

In the semi-finished product of the body, containing the shell 1 and the bottom 2, on the inner surface of the shell 1, localizers are applied in the form of transverse grooves of a sawtooth profile 3 with a pitch equal to 5.5 mm (9 rows in total) and pyramidal grooves 4, on the flat side of the grooves 3 (Fig. . 1, 2), which form a sawtooth profile of the shell 1 in the longitudinal direction. The base of the pyramidal grooves 4 is aligned with the tops of adjacent grooves 4 of the underlying groove 3 (Fig. 1), i.e. the recesses are located on the surface of the shell 1 in a checkerboard pattern. On the outer surface of the shell 1, a wave with a work-hardened layer 5 is technologically formed (Fig. 2). The dimensions of the wave on the semi-finished product are selected as follows: outer diameter of the wave Ø30.95 mm, inner Ø30 mm.

The case (Fig. 3), containing the shell 1 and the bottom 2, is obtained by machining a semi-finished product, with the formation of a thread for the fuse 6 and a groove for the leading belt 7, as well as the formation of a centering thickening of the ammunition on the outer surface along an average diameter of ∅29.85 mm . During the formation of the centering thickening, a partial cut of the cold-worked layer 5 (Fig. 4) occurs in places of maximum deepening of the localizers 3 and 4, thereby creating an additional weakening of the shell 1 when the ammunition is detonated.

Using the proposed method makes it possible to obtain grenade bodies with an increased yield of useful fragments of a given mass and shape. The absence of "saber-shaped" fragments is ensured.

Claims (1)

Fragmentation munition housing containing a shell, on the inner surface of which there are sawtooth profile destruction localizers in the form of transverse grooves, equipped on the flat side with equally distributed pyramidal grooves, characterized in that on the outer surface of the shell, opposite the fracture localizers, a hardened metal layer is removed - work hardening .

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