RU2488070C1 - Charge for construction shot - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: charge consists of spherical porous powder arranged in encapsulated cartridge case, Powder charge is made of spherical powder with porosity if 26-30 wt % and residual moisture content of 0.1-0.5 wt % graphitised from surface of 0.1-0.3 wt % of graphite at the following ratio of fractions, %: 0.2…0.4 mm - at least, 70, under 0.2 mm and over 0.4 mm - not over 30.

EFFECT: better characteristics in shooting.

1 tbl, 1 dwg

Description

The invention relates to the field of development of charges of gunpowder for small arms.

At present, in our country, both pyroxylin and spherical gunpowder (TFP) are used as a charge for small arms. However, the use of such powders as a charge in the construction cartridge does not provide the specified characteristics in the construction gun.

As a prototype, which is the closest technical solution to the proposed one, a charge of dibasic spherical gunpowder of the grade SPSN-900 / 4.40 (OST 84-876-79) is selected, including, wt.%: Graphite - 0.1 ... 0.3 ; moisture - 0.2 ... 0.9. Spherical particles in this charge are made with porosity not exceeding 5%. Such a charge in the construction cartridge has a large mass. Due to the low burning rate of gunpowder, the firing process, as a rule, is accompanied by a large smoke generation and a large contamination of the barrel in the construction and assembly gun.

The aim of the invention is to improve performance by reducing smoke during the shot.

The goal is achieved in that the charge for the construction cartridge is made of TFP based on pyroxylin, with a porosity of 26 ... 30 wt.% And a residual moisture content of 0.1 ... 0.5 wt.%, Graphitized from the surface of 0.1 ... 0, 3 wt.% Finely dispersed graphite in the following mass ratio of fractions,%:

0.2 ... 0.4 mm not less than 70 less than 0.2 mm and more than 0.4 mm no more than 30

The authors found that the use of a charge of spherical particles with a porosity of 26 to 30% can improve the operational characteristics of the construction and assembly gun by reducing mass and smoke during the shot.

A decrease in the porosity of spherical particles of less than 26% leads to a slowdown in the burning rate and an increase in the mass of the powder charge and, consequently, to additional smoke formation.

An increase in porosity of more than 30% leads to a sharp increase in the pressure of the powder gases in the channel of the construction gun.

A decrease in graphite of less than 0.1 wt.% Worsens the flowability of the powder charge. This, in turn, leads to fluctuations in the mass of the powder charge in the cartridge, and an increase in graphite of more than 0.3 wt.% Does not give a further stabilization effect of ballistic characteristics, but leads to the appearance of free graphite, which necessitates its beating.

An increase in the humidity of the powder charge of more than 0.5 wt.% Leads to an increase in the mass of the powder charge and smoke during the shot, and a decrease in humidity of less than 0.1 wt.% Is associated with an increase in the danger of the manufacturing process of gunpowder and additional energy consumption due to an increase in the duration of the drying process .

A decrease in the composition of the charge of the fraction of gunpowder 0.4 ... 0.2 mm less than 70 wt.% Leads to an increase in the pressure of the powder gases in the bore of the barrel of the construction and assembly gun.

The increase in fine and large fractions (less than 0.2 and more than 0.4 mm) of more than 30 wt.% Leads to a large spread in penetration of metal plates and an increase in the pressure of powder gases in the channel of the construction and assembly gun.

The drawing shows a construction cartridge, consisting of a sleeve 1 with an igniter composition and a powder charge 2.

The table shows the characteristics of the developed powder charge, performed within the boundary conditions (examples 1 ... 3), beyond them (examples 4, 5), as well as the prototype charge (example 6).

Table Characteristics of the powder charge for the construction cartridge Indicators Designed charge Prototype
Etc. Number 6 Example
(Project No. 1) Etc. Number 2 Etc. Number 3 Etc. Number 4 Etc. Number 5 1. Fractional composition, wt.%: - mass fraction of grains passing through the grid No. 0.4 and remaining on the grid No. 0.2 75 70 75 fifty 95 75 - mass fraction of grains remaining on grid No. 0.4 and passing through grid No. 0.2 25 thirty 25 fifty 5 25 2. The porosity of spherical particles,% 26 28 thirty twenty 40 5 3. The amount of input graphite,% 0.1 0.15 0.3 0.05 0.4 0.8 4. The moisture content in the TFP,% 0.5 0.4 0.1 0.1 0.8 0.6 5. Construction cartridge: K-1-short weak: - mass of charge, g 0.141 0.141 0.141 0.21 0.22 0.18 - average depth, mm 3.25 3.26 3.28 2.41 2,52 2.9 - the largest amount of deepening, mm 3,51 3.48 3.45 2.68 6.72 3.2 - the smallest amount of deepening, mm 3.01 3.12 3.11 1.34 4.41 2.1 - the spread of the depth, mm 0.51 0.36 0.35 1.34 1.31 1,1 K-2-short medium: - mass of charge, g 0.159 0.158 0.159 0.28 0.25 0.21 - average depth, mm 3.62 3.72 3.71 2.61 2.81 3,5 - the largest amount of deepening, mm 3.95 4.00 3.98 3.01 3.21 3.82 - the smallest amount of deepening, mm 3.11 3.65 3.72 1.91 1.96 2.41 - the spread of the depth, mm 0.84 0.35 0.28 1.10 1.25 1.41

Table continuation K-3-short strong: - mass of charge, g 0.18 0.181 0.18 0.27 0.26 0.25 - average depth, mm 4,51 4,50 4,52 3,51 3.68 4.32 - the largest amount of deepening, mm 4.77 4.75 4.78 3.81 3.90 4.68 - the smallest amount of deepening, mm 4.07 4,50 4.42 2.21 2.46 3.21 - the spread of the depth, mm 0.70 0.25 0.36 1,60 1.44 1.47 K-4-short superstrong: - mass of charge, g 0,200 0,200 0,200 0.32 0.31 0.27 - average depth, mm 5.03 5.00 5.01 3.9 4.2 4.95 - the largest amount of deepening, mm 5.21 5.23 5.12 4.6 4.8 5.10 - the smallest amount of deepening, mm 4.95 4.98 4.72 3,1 3,1 3.22 - the spread of the depth, mm 0.26 0.25 0.40 1,5 1.7 1.88 6. Smoke generation out out out It has It has It has 7. Number of shots without cleaning the gun 1000 1200 1100 400 500 600

According to the drawing, 4 types of short construction cartridges are produced: K-1 - weak, K-2 - medium, K-3 - strong and K-4 - super-strong. The mass of the charge for K-1 is 0.2 g; for K-2 - 0.22 g; for K-3 - 0.25 g; for K-4 - 0.27 g.

When testing, the depth in the steel plate for K-1 is 3 ± 0.5 mm; for K-2 - 3.5 ± 0.5 mm; for K-3 - 4 ± 0.5 mm; for K-4 - 4.5 ± 0.5 mm.

From the above table it follows that the charge developed from the pyroxylin spherical powder with a porosity of 26 to 30% (examples 1 ... 3) satisfies all the requirements for a short building and mounting cartridge K-1, K-2, K-3, K- four. The mass of the charge was reduced by 0.04 ... 0.07 g. The spread between the maximum and minimum deepening does not exceed 0.84 mm. Cleaning of construction and assembly pistols from soot was carried out after 1000 ... 1200 shots. Outside the boundary conditions, the charge for the construction cartridge does not provide the specified characteristics (examples 4, 5).

The charge obtained by the prototype (example 6) has a high mass of the powder charge (0.27 g), a large spread between the maximum and minimum penetrations (0.88 mm). Shots are accompanied by smoke formation, and cleaning the construction and assembly pistol from soot is carried out after 600 shots.

Thus, the charge developed by the authors for the construction cartridge allows:

- reduce the charge mass for all types of short construction cartridges (K-1, K-2, K-3, K-4);

- reduce the spread between the maximum and minimum values of the deepening;

- reduce smoke during the shot;

- increase the resource without cleaning the construction gun up to 1000 ... 1200 shots.

Claims (1)

The charge for the construction cartridge of spherical porous powder placed in an encapsulated sleeve, characterized in that the powder charge is made of spherical powder with a porosity of 26 ... 30 wt.% And a residual moisture content of 0.1 ... 0.5 wt.%, Graphite with the surface of 0.1 ... 0.3 wt.% graphite in the following mass ratio of fractions,%:
0.2 ... 0.4 mm not less than 70 less than 0.2 mm and more than 0.4 mm no more than 30