RU2488069C1 - CHARGE FOR 7,62 mm-RIFLE SHOT - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: charge is to be fitted in encapsulated cartridge case with bullet. Said charge consists of gun-cotton, diphenylamine, dinitrotoluene, centralite I, graphite, ethyl acetate, and moisture. Powder consists of the mix of 70-80 wt % of gun-cotton with nitrogen oxide content of 212.7-214.5 ml of NO/g and 20-30 wt % returnable-process wastes from previous process jobs, 10-30 wt % of HMX or hexogen relative to total content of gun-powder. Powder with bulk density of 0.970…0.995 kg/dm³ is phlegmatised from surface of 4.1-6.2 wt % of centralite I and 4.1-6.2 wt % of dinitrotoluene at the following ratio of fractions, wt %: 0.4…0.7 mm - at least 92, under 0.4 mm and over 0.7 mm - not over 8.

EFFECT: increased bullet velocity.

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Description

The invention relates to the field of production of spherical powders (TFP) and charges for small arms.

One of the challenges facing the development of gunpowder for the charge of a 7.62 mm rifle cartridge is to increase the flight speed of the bullet and ensure stable ballistic characteristics.

Known charge of phlegmatized TFP (application No. 4942294/23 (046993) from 06/04/1991), which is designed for 7.62 mm sporting rifle cartridge, including fractions of TFP containing in the surface layers of grains centralized I (C I) and dinitrotoluene (DNT), characterized in that in order to improve ballistic characteristics, it contains gunpowder with a bulk density of 0.960 ... 0.997 kg / dm ³ , and the content of C I and DNT in the surface layers of grains is 3.0 ... 6.0 and 3, 0 ... 5.0 wt.%, Respectively, in relation to the mass of the powder and additionally contains graphite in the surface layer in an amount of 0.1 ... 0.3 wt.%, with a residual moisture content of gunpowder 0.2 ... 0.4 wt.%, in the following mass ratio of fractions,%:

0.4 ... 0.56 - 50 ... 75 0.56 ... 0.63 - 20 ... 45 more than 0.63 and less than 0.4 - no more than 5.

A disadvantage of the known charge is that the developed charge for the 7.62 mm sports rifle cartridge does not provide ballistic characteristics in the 7.62 mm rifle cartridge.

The closest technical solution the authors chose application No. 201004248/02 (006013) from 08.02.2010 (prototype), according to which the charge for 7.62 mm sports rifle cartridge, including fractions of spherical powder made of nitrocellulose with a content of nitric oxide 213 , 0 ... 214.0 ml of NO / g, carbon and diphenylamine, with a bulk density of 0.960 ... 0.990 kg / dm ³ , with a content of C I and DNT in the powder layer of grains, is 3.0 ... 6.0 and 3.0 ... 4.5 wt.%, Respectively, in relation to the mass of gunpowder, additionally in the surface layer contains graphite in an amount of 0.1 ... 0.3 wt.% And ethyl acetate t (EA) in an amount of 0.5 ... 1.2 wt.%, with a relative humidity of 0.3 ... 0.9 wt.%, with a mass ratio of the fraction,%:

0.4 ... 0.56 - 55 ... 68 0.56 ... 0.7 - 27 ... 40 coarse fraction on a grid of 0.7 and fine fractions, passed through the grid 0.4 - no more than 5.

The disadvantage of such a powder charge from spherical powder is that the powder charge for a 7.62 mm sports rifle cartridge does not provide ballistic characteristics of the spherical powder in charge to a 7.62 mm rifle cartridge.

The aim of the invention is to increase the speed of a bullet in a 7.62 mm rifle cartridge.

This goal is achieved in that the charge for a 7.62 mm rifle cartridge, including a bullet, an encapsulated sleeve and a charge of powder consisting of pyroxylin, DPA, DNT, C I, graphite, EA and moisture, is placed in it, while the charge is made of gunpowder, consisting of a mixture of 70 ... 80 wt.% pyroxylin with a content of nitric oxide of 212.7 ... 214.5 ml NO / g and 20 ... 30 wt.% return-technological non-phlegmatized waste from previous operations, 10 ... 30 wt.% HM or hexogen in relation to the total content of pyroxylin, obtained spherical powder with bulk density of 0.970 ... 0.995 kg / dm ³ phlegmatize from the surface 4.1 ... 6.2 wt.% C I and 4.1 ... 6.2 wt.% DNT, in the following weight ratio of fractions,%:

0.4 ... 0.7 mm - not less than 92 less than 0.4 mm and more than 0.7 mm - no more than 8.

Target ballistic characteristics for a 7.62 mm rifle cartridge: mass of a powder charge - 3.25 ... 3.65 g, speed of a bullet - 835 ... 845 m / s, spread of speed of a bullet in a series of 10 shots - no more than 30 m / s, the maximum pressure of the powder gases in the barrel of the weapon, MPa: average - not more than 284.3, the highest - not more than 304.0, the smallest - not less than 230.4.

The authors found that the powder charge for a 7.62 mm rifle cartridge made of gunpowder, consisting of a mixture of 70 ... 80 wt.% Pyroxylin with a content of nitric oxide of 212.7 ... 214.5 ml NO / g and 20 ... 30 wt.% reciprocating non-phlegmatized wastes from previous operations, 10 ... 30 wt.% HMX or RDX, relative to the total mass of pyroxylin, with a bulk density of 0.970 ... 0.995 kg / dm ³ and phlegmatized from the surface of the powder elements 4.1 ... 6.2 wt. .% C I and 4.1 ... 6.2 wt.% DNT provides stable ballistic characteristics by mass e powder charge, the speed of the bullet and the pressure of the powder gases in the barrel of the weapon.

A decrease in pyroxylin of less than 70 wt.% With a nitric oxide content of less than 212.7 ml NO / g and an increase in recycling waste of more than 30 wt.% Leads to an increase in the bulk density of the powder charge, and this in turn increases the mass of the powder charge and reduces the speed a bullet’s flight, and an increase in the pyroxylin content of more than 80 wt.% with a nitric oxide content of more than 214.5 ml NO / g and a decrease in process waste less than 20 wt.% leads to an increase in the pressure of powder gases in the barrel of the weapon.

Octogen or hexogen in the composition of the TFP plays the role of an energy base that provides an increase in speed. A decrease in HMX or RDX of less than 10 wt.% Gives an almost insignificant increase in the flight speed of a bullet, while an increase in HMX or RDX of more than 30 wt.% Leads to unstable combustion of powder elements, and this leads to a spread in the speed of flight of bullets in a series of 10 shots.

A decrease in the bulk density of spherical powder in a powder charge of less than 0.970 kg / dm ³ leads to an increase in the pressure of powder gases in the channel of the gun barrel, and an increase in the bulk density of TFP in the powder charge of more than 0.995 kg / dm ³ is associated with technological difficulties.

A decrease in CI in the surface layer of the powder elements is less than 4.1 wt.% And DNT less than 4.1 wt.% Leads to an increase in the pressure of the powder gases in the barrel of the weapon, and an increase in CI in the surface layers of the powder elements is more than 6.2 wt. % and DNT more than 6.2 wt.% leads to an increase in the mass of the powder charge and a decrease in the flight speed of the bullet.

An increase in the fraction of the TFP more than 0.7 mm leads to an increase in the mass of the powder charge and a decrease in the speed of the bullet, while an increase in the fraction of the TFP less than 0.4 mm leads to an increase in the pressure of the powder gases in the channel of the gun barrel.

The physico-chemical and ballistic characteristics of the powder charge developed by the authors for a 7.62 mm rifle cartridge in the range of boundary conditions (examples 1 ... 3) and outside the boundary conditions (examples 4, 5) are given in the table.

Table Physico-chemical and ballistic characteristics of the powder charge for a 7.62 mm rifle cartridge The name of indicators Example (Ex. No. 1) Etc. Number 2 Etc. Number 3 Etc. Number 4 Etc. Number 5 Pyroxylin with a nitric oxide content of 212.7 ... 214.5 ml NO / g, wt.% 70 75 80 60 80 The content of reciprocal waste, wt.% thirty 25 twenty 40 twenty Octogen or RDX, wt.% 10 twenty thirty 5 35 The content of DFA, wt.% 0.4 0.65 0.9 0.3 1,5 The content of I, wt.% 4.1 5.1 6.2 3.8 7.6 The content of DNT, wt.% 4.1 5.1 6.2 3.8 7.6 The graphite content, wt.% 0.1 0.2 0.3 0.1 0.6 EA content, wt.% 0.4 1,0 1,6 0.4 2.0 The moisture content, wt.% 0.2 0.6 0.8 0.2 1,6

Table continuation The fraction of gunpowder 0.7 ... 0.4 mm, wt.% 92 96 97 80 96 The amount of coarse and small things, wt.% 8 four 3 twenty four Bulk density, kg / dm ³ 0.970 0.982 0,995 0.930 0,995 Chemical resistance, mm Hg 28 28 29th 29th thirty Ballistic characteristics Mass of charge, g 3.28 3.30 3.29 3.0 3.6 Bullet flight speed, m / s 835 839 840 810 805 The dispersion of the flight speed of bullets in a series of 10 shots, m / s fourteen 12 fourteen 39 45 The maximum pressure of the powder gases, MPa Average 263.2 262.2 260.8 282.3 293.6 The greatest 277.5 279.4 281.4 292.0 308.8 Least 252.0 248.0 254.0 261.7 276.6

From the data in the table it can be seen that the powder charge developed by the authors for a 7.62 mm rifle cartridge satisfies all the requirements within the boundary conditions (examples 1 ... 3) and meets all the requirements and has stable ballistic characteristics, both in terms of bullet speed and spread of bullet speed in a series of 10 shots, as well as on the pressure of powder gases in the barrel of a weapon. Outside the boundary conditions (examples 4, 5), the resulting powder charge does not satisfy the requirements of ballistic characteristics.

Claims (1)

The charge for a 7.62 mm rifle cartridge, designed to be placed in an encapsulated sleeve with a bullet, the charge is made of gunpowder, consisting of pyroxylin, diphenylamine, dinitrotoluene, centralite I, graphite, ethyl acetate and moisture, characterized in that the charge is made of gunpowder , consisting of a mixture of 70 ... 80 wt.% pyroxylin with a nitric oxide content of 212.7 ... 214.5 ml NO / g and 20 ... 30 wt.% return-technological non-phlegmatized waste from previous operations, 10 ... 30 wt.% HMX or RDX in relation to the total content of pyroxylin, Acquiring spherical powder with a bulk density of 0.970 ... 0.995 kg / dm ³ phlegmatizing surface with 4.1 ... 6.2 wt.% tsentralita I and 4.1 ... 6.2 wt.% dinitrotoluene, with the following fractional composition powder, wt.% :
0.4 ... 0.7 mm not less than 92 less than 0.4 mm and more than 0.7 mm no more than 8