RU2589797C1 - Fragmentation grenade for cartridge for hand grenade launcher and method for production of fragmentation jacket thereof - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: group of inventions relates to fragmentation grenades for hand grenade launchers and methods of producing fragmentation jackets of such grenades. Fragmentation grenade to cartridge of hand grenade launcher comprises thin-walled plastic housing, contact fuse and fragmentation unit including explosive charge and fragmentation jacket around it attached by adhesive composition with bursting charge and plastic thin-walled grenade housing. Fragmentation jacket is formed by fragments sources in form of rings successively installed onto explosive charge. Method of making fragmentation grenade jacket includes manufacturing separate sources of fragments, their connection to each other, bursting charge and thin-wall plastic grenade housing by adhesive composition and adhesive composition vulcanising or curing. Sources of fragments are made in form of rings with equal thickness and width, on which longitudinal notches of rectangular shape are mechanically made from side of outer cylindrical surface.

EFFECT: simplified design of fragmentation grenade.

2 cl, 4 dwg

Description

The invention relates to the field of defense technology, in particular to devices and methods used in the design and manufacture of fragmentation grenades for cartridges for hand grenade launchers, but can be used in any small-caliber fragmentation ammunition.

Fragmentation grenades are widely used to defeat manpower and other targets of the enemy in close combat, where, from the conditions of survival, firing should be as effective as possible, which requires fragmentation grenades to have high stability of all parameters determining its effectiveness. Known fragmentation grenades of cartridges for hand grenade launchers do not satisfy this requirement, due to the imperfection of their device and the method of manufacturing fragmentation shirts for them.

For example, in the well-known grenade launcher DM 12 for hand grenade launchers described in "Jane’s Ammunition Handbook Edited by Terry J Cander and Charles Q Cutshaw Ninth Edition 2000-2001" on page 565 and its analogue adopted by the authors and applicant of the present invention, the grenade consists of a thin aluminum case, a contact fuse and a fragmentation unit, which is a bursting charge, around which a steel fragmentation shirt in the form of a sleeve with an internal mesh notch, which is made sequentially by mechanical means, is placed.

The explosive charge is fixed in the fragmentation jacket by pressing in it a prefabricated explosive tablet or pouring explosive into its cavity in a molten (pasty) state.

The device and the manufacturing method give rise to the following disadvantages in the analogue:

- a small mass of fragments due to the removal of a significant part of the metal of the sleeve in the manufacture of the grooves of the mesh notch, which reduces their range and, therefore, reduces the area of fragmentation of the grenade;

- a significant difference between the vertices of the grooves forming the mesh notch and the outer diameter of the sleeve, which causes high instability of the separation of the sleeve into individual fragments and thereby reduces the area of damage by them and changes its configuration;

- the expenditure of a significant part of the explosive charge explosion energy on the destruction of the sleeve along the perimeters of each fragment, which reduces their range;

- the presence of a thin-walled aluminum case of a grenade, which is randomly destroyed during an explosion, some fragments will slow down its parts and thereby reduce their range;

- the need and complexity of thoroughly removing the burrs that form in the cavity of the sleeve during the manufacture of the mesh notch, since if they are present, there may be a danger of explosion when the explosive charge of the explosive charge is pressed out in the sleeve or cavities may appear behind them in the groove of the notch, which violate the specified nature of the fragmentation of the fragmentation shirt into individual fragments and, therefore, will distort the area of damage and its configuration.

The disadvantages of the analogue are partially eliminated in the grenade of the cartridge according to patent RU No. 2349868 F42B 5/02, F42B 12/32 and F42B 30/04 dated 05/10/2002 under the name "Shrapnel cartridge for a hand grenade launcher and the method of forming its fragmentation shirt", which is accepted the authors and the applicant of the present invention its prototype.

The prototype grenade consists of a thin-walled plastic case in which a contact fuse and a fragmentation block are placed, consisting of an explosive bomb (explosive charge) and a fragmentation shirt formed between the grenade body and a thin-walled metal shell worn on the explosive charge. The fragments of the shirt are formed by steel balls bonded to each other, with a thin-walled metal shell and a plastic case of a grenade with an adhesive composition, and from the side of the front end of the case, the grenades are pressed against the explosive charge by an elastic partition made of cardboard.

A method of forming a prototype fragmentation shirt includes:

- placing a cardboard partition in the head of the grenade body;

- filling the damaging elements in the form of balls and pouring the adhesive composition into the head of the grenade body to the partition;

- mixing balls and adhesive with each other;

- placing a thin-walled metal shell mounted on a mandrel that repeats the explosive charge in the head of the grenade body coaxially with it;

- turning the resulting assembly with the mandrel down while simultaneously pressing the thin-walled metal shell, the head of the grenade body and balls along the mandrel to each other with elastic deformation of the transverse partition;

- rotation of the head of the grenade and thin-walled metal shell relative to each other;

- vulcanization or curing of the adhesive composition.

From the description of the prototype it follows that it compares favorably with the analogue in the simplicity and safety of manufacturing a fragmentation shirt. The plastic thin-walled body of his grenade crumbles into dust when a bursting charge is triggered and does not affect the speed of steel balls. In addition, a thin-walled metal shell of a bursting charge can be made of sheet metal with high stability of its wall thickness on standard equipment: deep drawing on presses or rolling mills, which also provides high stability of the speed of steel balls and their flight directions. All these features of the prototype provide him with consistently high performance. At the same time, it is structurally more complicated than the analogue (the presence of a large number of balls, a thin-walled shell and a partition from cardboard), it also has high costs for the destruction of a thin-walled metal shell almost along the perimeters of most balls and has a mass of each steel ball 25-30% less than the mass of the pyramidal fragment analogue, and therefore less range. The adhesive composition that fills the free space between the balls, thin-walled shell and the body of the grenade is a completely passive element from the point of view of the striking parameters of the grenade and only makes it heavier. Another significant disadvantage of the prototype can be considered the presence of balls from the front end of the explosive charge, because when shooting with any elevation angles of the gun barrel, these fragments will be blocked by the surface of the target.

The technical task of the present invention is to eliminate the disadvantages of the known fragmentation grenades, namely, simplifying their design and reducing passive weight while increasing the parameters of their fragmentation effect.

According to the present invention, the solution of the technical problem is achieved by the fact that in the known fragmentation grenade to the cartridge for a hand grenade launcher containing a thin-walled plastic case, a contact fuse and a fragmentation block including a bursting charge and a fragmentation shirt around it, bonded with an adhesive composition with a bursting charge and a plastic thin-walled grenade body, fragmentation shirt is formed by sequentially installed on the explosive charge sources of fragments in the form of rings having equal widths y and a thickness, with a longitudinal notch formed uniformly from the outer cylindrical surface of the rings, the edges of the notch on the outside diameter of the ring tightly pressed on to each other.

A method of manufacturing a grenade fragmentation shirt for a cartridge for a hand grenade launcher, including the manufacture of separate sources of fragments, connecting them with an explosive charge and a thin-walled plastic grenade body with an adhesive composition and subsequent vulcanization or curing of the adhesive composition, the fragments sources are made in the form of rings having equal thickness and the width on which from the side of the outer cylindrical surface mechanically perform longitudinal notches of a rectangular shape with a rounded bottom, with the distance between them, equal to or slightly greater than the thickness of the ring, and a depth equal to 0.6-0.7 of the thickness of the ring, while the outer diameter of the ring is made larger than the internal diameter of the fragmentation grenade body by an amount equal to the quotient of dividing by% the total width of all the notches rings, then compress the rings on the outer cylindrical surface in the radial direction to the outer diameter of the fragmentation shirt and mechanically remove from the inner cylindrical surface of the rings the resulting swelling of the metal against us cells, after this, the necessary number of rings lubricated with adhesive is successively set to a breaking charge placed in a mandrel simulating the bottom of the grenade, and a thin-walled plastic grenade body is put on the assembly obtained.

The essence of the invention is illustrated in the drawing, where in FIG. 1 shows a fragmentary fragment of a fragmentation grenade, and in FIG. 2, 3 and 4 — the ring — the source of the fragments in the state of its sequential manufacture.

The shrapnel shirt 1 (Fig. 1) is a set of 2 metal rings 3 — sources of fragments successively mounted on a bursting charge. The rings 3 are mounted on a bursting charge 2 on the glue, and on top of them also on the glue is a thin-walled plastic case 4 of fragmentation grenade. To carry out these operations, the rear end of the explosive charge 2 is placed in the technological mandrel 5, simulating the back of the grenade.

Rings 3 (Figs. 2, 3 and 4) have a thickness B and equal width B and length F, i.e. as close to the shape of a cube. For this purpose, longitudinal grooves of width D are made on the rings 3 from the side of the outer diameter G, the side walls of which are smoothly interfaced with the bottom of the grooves. The depth of the slots E is made equal to 0.6-0.7 of the thickness B of the ring 3, and the outer diameter G of the ring 3 is made greater than the outer diameter A of the fragmentation shirt 1 (or the inner diameter of the plastic case 4 of the grenade) by an amount equal to the quotient of the division of the total width D all cuts on π. After this, the rings 3 are crimped along the outer diameter G to its size A, while the edges of the cuts D are compressed to each other along the outer diameter, and under the cuts on the inner diameter of the ring 3, wave-like swellings 6 of the metal of the rings are formed, which are removed mechanically, boring the inner diameter rings in size And equal to the outer diameter of the explosive charge 2, taking into account its adhesive connection with the rings 3.

From the description of the device grenades to the cartridge for a hand grenade launcher and the manufacturing process of the fragmentation shirt of the present invention follows:

- the technology of manufacturing shrapnel shirts will be greatly simplified;

- the absence of additional parts and materials leads to a decrease in the passive weight of the fragmentation shirt and an increase in the mass of an individual fragment;

- all the energy of the explosion is directed to the destruction of the fragmentation shirt and the message of the initial speed to its fragments, which increases the parameters of their fragmentation effect.

Claims (2)

1. A fragmentation grenade for a cartridge for a hand grenade launcher, comprising a thin-walled plastic case, a contact fuse and a fragmentation block including a bursting charge and a fragmentation shirt around it, fastened with adhesive with a bursting charge and a plastic thin-walled grenade case, characterized in that the fragmentation shirt is formed sequentially sources of fragments in the form of rings having equal width and thickness, mounted on a discontinuous charge, with a uniformly made longitudinal notch from the side of the outer cylinder -cylindrical surfaces of the rings, the edges of the notch on the outside diameter of the ring tightly pressed on to each other. 2. A method of manufacturing a grenade fragmentation shirt for a cartridge for a hand grenade launcher, including the manufacture of individual sources of fragments, connecting them with an explosive charge and a thin-walled plastic grenade body with an adhesive composition and subsequent vulcanization or curing of the adhesive composition, characterized in that the sources of fragments are made into the shape of rings having equal thickness and width, on which longitudinal notches of rectangular shape are mechanically performed from the side of the outer cylindrical surface with a rounded bottom, with a distance between them equal to or slightly larger than the thickness of the ring, and a depth equal to 0.6-0.7 of the thickness of the ring, while the outer diameter of the ring is made larger than the internal diameter of the fragmentation grenade case by an amount equal to the quotient of dividing by π of the total width of all the notches of the ring, then they compress the rings along the outer cylindrical surface in the radial direction to the outer diameter of the fragmentation shirt and mechanically remove the resulting rings from the inner cylindrical surface of the rings utiya metal against incisions thereafter successively set the required number of rings lubricated adhesive composition on the bursting charge, arranged in the mandrel simulating the bottom of the grenade, and the resulting assembly is put on a thin-walled plastic shell grenades.

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