RU2481547C1 - CHARGE FOR 5,6 mm SPORT RIM-FIRE CARTRIDGE - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: charge for elite 5.6 mm sport rim-fire cartridge consists of spherically grained propellant located in the case with bullet. The charge is made of spherical powder elements. The elements consist of pyroxyline of one batch with nitrogen oxide content 213.2…214.5 ml NO/g, 0.4…0.8 wt % of diphenylamine, 0.3…0.8 wt % of carbon and bonded graphite, with bulk density 0.65…0.71 kg/dm³, 0.2…1.0 wt % of dinitrotoluene desensitised from the surface in relation to powder, with remaining content of ethyl acetate 0.3…0.9 wt % and moisture 0.3…0.6 wt %. Fractions mass ratio: - mass fraction of powder passed through the screen 0.4 mm and remained on the screen 0.315 mm is not less than 80 %, - mass fraction of powder remained on the screen 0.4 mm and passed through the screen 0.315 mm is not more than 20 %.

EFFECT: improvement of ballistic characteristics of 5,6 mm sport cartridges.

1 tbl, 1 dwg

Description

The invention relates to the field of development of charges for sports rifle cartridges for small arms.

Known charge for small arms from spherical powder (TFP) according to TU 750 6804-98-90, which is intended for use in sports rifle cartridges of caliber 5.6 mm. The charge consists of fractions of 0.2 ... 0.4 mm of not less than 75.0 wt.%, More than 0.4 mm and less than 0.2 mm of not more than 2.0 wt.% With a bulk density of the powder charge of 0.61 ... 0 , 77 kg / dm ³ . Such a powder charge provides a flight speed of 325 m / s. However, this charge gives a large velocity spread between the largest and smallest values.

As a prototype, the authors chose patent SU 1813292 A3, according to which the powder charge is made with a bulk density of 0.62 ... 0.72 kg / dm ³ of particles with a size of 0.2 ... 0.4 mm, phlegmatized from the surface to a mass of powder of 2.0 ... 4.0 wt.% Dibutyl phthalate, graphitized from the surface of 0.1 ... 0.3 wt.% Graphite, with a moisture content of 0.1 ... 0.9 wt.% In the following weight ratio of fractions, wt.%

0.2 ... 0.4 mm not less than 75 less than 0.2 mm and more than 0.4 mm no more than 25

The powder charge given for the prototype for a 5.6 mm sporting rifle cartridge of ring ignition with a bullet of 2.35 ... 2.45 g and a mass of powder charge of 0.10 ... 0.16 g provides a flight speed of 385 ... 405 m / s, dispersion between the highest and lowest values of the bullet’s flight speed of not more than 18 m / s, the maximum pressure of the powder gases, MPa: average - not less than 88.2; the largest - no more than 127.5, the spread between the highest and lowest values of the pressure of the powder gases is not more than 19.6.

Such a powder charge does not provide ballistic performance in elite 5.6 mm ring-shaped sports cartridges.

The aim of the invention is the development of an elite charge for 5.6 mm sports cartridges of annular ignition, not inferior to foreign analogues.

The drawing shows the proposed elite 5.6 mm sports cartridge annular ignition. The cartridge contains a bullet 1, pressed into a sleeve 2 with a primer 4, which contains a charge of spherical powder elements 3, consisting of pyroxylin in one batch with a nitrogen content of 213.2 ... 214.5 ml NO / g, 0.4 ... 0 , 8 wt.% Diphenylamine (DFA), 0.3 ... 0.8 wt.% Carbon and bound graphite, with a bulk density of 0.65 ... 0.71 kg / dm ³ , phlegmatized from the surface of 0.2 ... 1.0 wt.% dinitrotoluene (DNT) in relation to the powder, with a residual content of ethyl acetate (EA) of 0.3 ... 0.9 wt.% and moisture 0.3 ... 0.6 wt.%, in the following weight ratio of fractions,%:

- mass fraction of gunpowder, passed through the mesh 0.4 mm and remaining on the grid 0.315 mm not less than 80 - mass fraction of gunpowder, 0.4 mm remaining on the grid and passing through the grid 0.315 mm no more than 20

Ballistic performance requirements for an elite sports 5.6 mm ring ignition cartridge: bullet weight - 2.59 ± 1 g, charge mass - 0.085 ... 0.10 g, average speed - 320 ... 330 m / s, the difference between the highest and lowest values bullet speeds - not more than 12 m / s, maximum pressure of the powder gases, MPa: average - not less than 78.4, the highest - not more than 122.5, the difference between the highest and lowest pressure values of the powder gases - not more than 11.7.

The authors found that the powder charge for an elite 5.6 mm sports ring ignition cartridge is made of spherical powder elements consisting of pyroxylin in one batch containing nitric oxide 213.2 ... 214.5 ml NO / g, 0.4 ... 0.8 wt.% DFA, 0.3 ... 0.8 wt.% carbon and bound graphite, with a bulk density of 0.65 ... 0.71 kg / dm ³ , provides the specified ballistic characteristics.

A decrease in the content of nitric oxide in pyroxylin of less than 213.2 ml NO / g leads to an increase in the mass of the powder charge and to an increase in the dispersion of the velocity of the bullet between the maximum and minimum values, and an increase in nitric oxide in pyroxylin more than 214.5 ml of NO / g leads to an increase pressure of powder gases in the barrel of a weapon.

A decrease in DFA less than 0.4 wt.% Leads to a decrease in the chemical resistance of TFP, and an increase in DFA more than 0.8 wt.% Leads to a decrease in the energy of gunpowder. The decrease in the bulk density of the powder less than 0.65 kg / DM ³ leads to an increase in the pressure of the powder gases in the channel of the barrel of the weapon. A decrease in carbon and bound graphite in a powder charge of less than 0.3 wt.% Leads to an increase in the flight speed of bullets, and an increase in carbon and bound graphite of more than 0.8 wt.% Does not give a further effect.

To increase the progressiveness of burning a powder charge, powder elements from the surface are phlegmatized with 0.2 ... 1.0 wt.% DNT. A decrease in DNT less than 0.2 wt.% Leads to an increase in the spread between the flight speeds of the bullets, and an increase in DNT more than 1.0 wt.% Leads to a decrease in the energy of the powder charge.

Ethyl acetate and moisture in the composition of the powder charge play the role of technological additives, a decrease in EA of less than 0.3 wt.% And moisture of less than 0.3 wt.% Is associated with technological difficulties, and an increase in EA of more than 0.9 wt.% And moisture more than 0, 6 wt.% Leads to a decrease in the energy characteristics of the powder charge.

Optimum ballistic characteristics for an elite 5.6 mm annular sports ignition cartridge are ensured with fractional composition: the mass fraction of gunpowder passing through the net 0.4 and remaining on the net 0.315 is not less than 80 wt.%, The mass fraction of gunpowder remaining on the net 0, 4 and passing through the grid 0.315 - not more than 20 wt.%. A decrease in the main fraction of gunpowder less than 80 wt.% And an increase in the amount of coarseness of fines from more than 20 wt.% Leads to an increase in the dispersion of the speed of flight of bullets and an increase in the pressure of powder gases in the channel of the barrel of the weapon.

The table shows the characteristics of the elite powder charge developed by the authors for a 5.6 mm annular sports ignition cartridge made within the boundary conditions (examples 1 ... 3) and outside the boundary conditions (examples 4, 5).

Powder charge characteristics for a 5.6 mm annular sports cartridge The name of indicators Example (Ex. No. 1) Project 2 Project 3 Project 4 Ex.5 The content of nitroxide in pyroxylin, ml NO / g 213.2 213.7 214.5 212.5 214.5 The content of DFA, wt.% 0.4 0.6 0.8 0.2 1,0 The content of carbon and bound graphite, wt.% 0.3 0.6 0.8 0.1 1,0 The content of DNT, wt.% 0.2 0.6 1,0 0.1 1,2 EA content, wt.% 0.3 0.6 0.9 0.2 1,0 The moisture content, wt.% 0.3 0.4 0.6 0.1 0.8 Bulk density, kg / dm ³ 0.65 0.67 0.71 0.59 0.8 Mass fraction of gunpowder passing through the mesh 0.4 and remaining on the mesh 0.315, wt.% 82 86 84 70 76 Mass fraction of gunpowder remaining on the net 0.4 and passing through the net 0.315, wt.% 8 four 6 thirty 24 Ballistic characteristics - mass of a bullet, g 2,58 2.59 2.60 2,58 2.60 - mass of powder charge, g 0.87 0.88 0.87 0.77 0.12 - bullet flight speed, m / s 324 325 324 307 310 - The difference between the largest and smallest values of the bullet’s flight speed, m / s 6 5 6 fifteen eighteen The maximum pressure of the powder gases, MPa - average 89.2 90.2 89.7 107.8 117.6 - the largest 109.8 112.7 110.3 124.5 127.5 - The difference between the largest and smallest values of the pressure of the powder gases, MPa 5.8 6.7 6.4 19.6 23.5

It can be seen from the table data that the developed elite powder charge for a 5.6 mm sports cartridge within the boundary conditions (example 1, 2, 3) provides all the requirements for ballistic characteristics and is at the level of foreign analogues, outside the boundary conditions, the resulting powder charge does not satisfy the requirements of ballistic characteristics.

Claims (1)

Charge for an elite 5.6 mm sports ring ignition cartridge, consisting of spherical powder, placed in a sleeve with a bullet, characterized in that the charge is made of spherical powder elements consisting of pyroxylin of one batch containing nitric oxide 213.2 ... 214.5 ml NO / g, 0.4 ... 0.8 wt.% diphenylamine, 0.3 ... 0.8 wt.% carbon and bound graphite, with a bulk density of 0.65 ... 0.71 kg / dm ³ , phlegmatized from the surface 0.2 ... 1.0 wt.% Dinitrotoluene in relation to the powder, with a residual content of ethyl acetate of 0.3 ... 0.9 wt.% And moisture 0.3 ... 0.6 wt.% At further short weight ratio of fractions,%:
mass fraction of gunpowder, passed through the mesh 0.4 mm and remaining on the grid 0.315 mm not less than 80 mass fraction of gunpowder, 0.4 mm remaining on the grid and passing through the grid 0.315 mm no more than 20