RU21592U1 - Lamellar powder - Google Patents

Description

Lamellar powder

Authors: V.V. Namestnikov I.V. Krivenko, Yu.M., Filippov,

A.E. Melnikov, E.V. Shapovalov, S.E. Mezheritsky, T.V. Andreeva

The utility model relates to the field of pyroxylin powders and propellant charges and can be used for sports, hunting smoothbore and rifled weapons and other small-caliber systems.

Currently, Russia produces three types of small grades of pyroxylin gunpowder for small arms: spherical, grained and lamellar.

For example, for the equipment of hunting cartridges, spherical gunpowders of the brands “Extra O,“ OSNF, “Superbars,“ Isyubr. To equip sporting cartridges, spherical gunpowder of the brands “Sunar SVS,” Sep 22 / 4.87, and also gunpowder of the type “Cowboy. However, the spherical shape determines the degressive nature of the combustion of powder elements, which ultimately worsens the ballistic characteristics of the gunpowder.

But the traditional pressing technology produces porous granular gunpowder (for example, brands “Sunar,“ Sunar-SV, “CyHap-MarH5nvf), which have a cylindrical shape with a channel / V.I. Gindich Technology of pyroxylin powders: Volume 2. Production of gunpowders - Kazan - 1995 390s /. The surface layers of the powder elements are coated with graphite, which performs several functions. Firstly, it ensures the stability of the combustion of gunpowder. Secondly, it eliminates the electrification of granular powders and improves their flowability.

S06V25 / 24

Exceed 680 kgf / cm, and the average pressure should not exceed 630 kgf / cm, which meets the requirements of the JV International Convention. Therefore, the average pressure in the bore is usually in the range of 400 ... 600 kgf / cm.

It is known that the powder grain channel begins to work when

powder gas pressures of more than 650 kgf / cm. At lower pressures, the single-channel form of grain is unjustified, since the powder burns according to the laws of combustion of the cylinder. As a result, the ballistic characteristics of gunpowder sharply worsen.

With an overdose of gunpowder, the pressure in the barrel channel usually exceeds 650 kgf / cm. As a result, the channel begins to work in the powder element, which leads to a double rate of gas formation and, consequently, to a sharp pressure jump, which can lead to rupture of the barrel, which is often observed with manual equipment of cartridges by hunters.

Currently, the Sokol brand powder (GOST 22781-77), which is taken as a prototype of this utility model, is considered to be the easiest to handle and very popular. The powder plates with a graphitized surface have a rectangular shape. The average plate thickness is 0.13 - 0.022 mm. The length of the plate edge is from 1.24 to 1.60 mm.

However, the geometrical shape of the powder elements, which, due to the angles, creates additional resistance during sieving, sorting of the powder, impairs its flowability and reduces gravimetric density, is a significant drawback in operating conditions for plate powder.

The purpose of this utility model is to eliminate these drawbacks and create a new type of plate powder for sports and hunting smoothbore and rifled weapons and other small-caliber systems.

This goal is achieved in that the plate powder for the equipment of sports and hunting smoothbore and rifled weapons and other small-caliber systems is produced in the form of a disk.

The positive effect of the presented utility model is achieved due to the disk-shaped shape of the powder elements, in which the thickness of the disk is less than its diameter. This form of lamellar powder elements provides, firstly, the stability of the gas formation of the combustion process and, accordingly, the improvement of the ballistic characteristics of the powder. Secondly, the absence of angles helps to improve the operational characteristics of the powder, in particular, its flowability and increase the gravimetric density.

Table 1 presents the main physico-chemical parameters of the disk-shaped powder, and in tables 2, 3 - its ballistic indicators in comparison with granular ("Sunar) and plate (" Falcon) gunpowders.

Thus, the proposed lamellar gunpowder for sports and hunting smoothbore and rifled weapons and other small-caliber systems due to the disk-shaped form has high ballistic characteristics and improved operational properties.

Table 1.

Physico-chemical characteristics of disk-shaped powder

Name the indicators

1. Appearance

2. The diameter of the plates, mm

3. The average thickness of the plates, not more than, mm

4. The content of volatile substances,%

general content, no more

removed by hourly drying, not less than

not removable by drying, not less

5. The content of DFA,%

6. The residual content of nitrate,

no more, %

7. The content of free graphite,

no more, %

Value range

Disc-shaped plates

forms graphitized by

surface

fifteen

0.8

0.9

0.1

0.3: 1.8

0.4 0.04

Ballistic indicators of sports powders Name of indicators "Falcon

1. Type of powder element

2. The smallest mass of powder charge, g

3.Mass of fraction, g.

4. The average speed of the shot projectile, m / s

5. The pressure of the powder gases in the canapes of the barrel at a distance of 25 mm from the breech section of the barrel, kgf / cm

average

the greatest

Table 2.

Single channel

Disc-shaped plate

1.55

1.35 24

24

343

345

600

560 680 630 Type of sports powder “Sunar-SV Disc-shaped

Ballistic indicators of hunting gunpowders

Table 3.

Claims (1)

Lamellar gunpowder for sports, hunting smoothbore and rifled weapons and other small-caliber systems, characterized in that the powder elements have a disc-shaped shape, the disc thickness of which is less than their diameter.