RU2372579C1 - Small arms cartridge - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: proposed cartridge comprises cartridge case with primer, propellant charge and bullet consisting of lead core and jacket. Aforesaid lead core features three and more lengthwise crimps made in forming by closing lengthwise incisions made in core billet. Note that aforesaid crimps feature depth making 25% to 40% of core diametre.

EFFECT: reduced probability of rehitting by rebounding bullet fragments.

4 cl, 3 dwg

Description

The invention relates to the field of small arms ammunition intended for use by law enforcement agencies in various conditions, including in settlements, in a limited space. The invention is aimed at reducing the likelihood of secondary damage from ricochet fragments of bullets.

Known 9-mm pistol cartridge with a bullet with a steel core, index 57-N-181C (drawing No. 4-27147, the holder of the original documents - military unit 64176), the bullet of which consists of a bimetallic shell, lead shirt and steel core. The bullet has a high penetration ability, but has a high rebound ability. When a bullet encounters a solid barrier at various angles, the bullet is divided into fragments of a shell, a lead shirt, and a steel core, which is deformed, but does not lose its integrity and is reflected from the obstacle in different directions. When ricochetting, penetration of a sheet of five-layer plywood (which is the equivalent of demi-season clothing in strength) installed at a distance of 3 m from the obstacle occurs with each shot, which is a disadvantage of the known bullet.

The prototype of the invention is a 5.45 mm cartridge with a bullet with a lead core PRS - low rebound ability (drawing IZHMV 771811.005, the holder of the original documents - closed joint-stock company "Barnaul cartridge factory"). See RF patent No. 225508 "Bullet cartridge small arms." The bullet of the known prototype cartridge consists of a bimetallic shell and a lead core. An annular ledge is made on the inner surface of the head of the shell, restricting the movement of the lead core in the shell. The wall thickness at the location of the step is from 30 to 65% of the wall thickness before the formation of the step. In general, the bullet has good indicators of accuracy of fire and fragmentation of the shell when meeting with solid obstacles at different angles, but low indicators of fragmentation of the lead core.

The ledge is a stress concentrator. When hitting an obstacle, the nose of the shell detaches with the formation of a torn edge, which, with further movement of the lead core, contributes to the separation of the shell into a large number of longitudinal fragments.

The core of a bullet is a solid body without concentrators breaking it into parts. When the core meets an obstacle, it is destroyed with the formation of parts having an unequal mass. When reflected from an obstacle, the largest fragments of the core retain high speed and energy. Those. in this bullet design, the issue of guaranteed fragmentation of the lead core when it meets an obstacle is not resolved.

The technical problem that this invention is directed to is to create a bullet having a reduced rebound ability compared to the prototype.

The stated technical problem is achieved in that the lead core is made with three or more longitudinal folds with a depth of 25 to 40% of the core diameter.

Longitudinal folds are evenly distributed on the outer surface of the lead core.

Longitudinal folds are made along the entire length of the core.

The width of the notches in the core blank is from 6 to 15% of its diameter.

The novelty of the proposed technical solution is the implementation of a lead core with three or more longitudinal folds with a depth of 25 to 40% of the core diameter.

These signs are new, non-obvious, industrially feasible and aimed at achieving the technical task posed by the invention to eliminate large fragments of a lead core having high energy and amazing ability after meeting with solid obstacles.

Figure 1 schematically shows the proposed cartridge.

Figure 2 shows a profiled lead wire with notches.

Figure 3 shows the matrix used for the manufacture of lead wire.

The proposed cartridge design contains an encapsulated sleeve 1 with a propelling charge 2, a bullet 3 containing a lead core 4 and a sheath 5. At least three longitudinal folds 6 are made on the side surface of the lead core 4. The folds 6 are made along the entire length of the core. The number of longitudinal folds 6 can be four, and five, or more.

By direct extrusion of lead through a matrix 7 with protrusions 8, a profiled wire 9 is obtained with three or more longitudinal cuts formed on its outer surface 10. After cutting the workpiece from the profiled lead wire, the core is stamped, on which the geometry of the lead core is formed. In this case, the incisions are closed, forming longitudinal folds.

The proposed cartridge small arms works as follows:

- when a bullet hits a solid obstacle, its head deforms initially;

- under the resulting high pressure of lead, the shell is divided into several fragments;

- the released core breaks up into fragments, while the mass of the largest fragment does not exceed the mass of one sector. Fragments, reflected from the barrier, quickly lose speed and energy.

The introduction of the operation of forming longitudinal folds in the core does not require significant additional material costs and allows the use of existing technological equipment.

The experiments established that the depth of the longitudinal folds on the side of the core, equal to 25 to 40% of the core diameter, retains the optimal characteristics of the cartridge and provides a significant reduction in the effect of rebounding.

When the depth of the folds is less than 25% of the diameter, reliable separation of the core into fragments does not occur. The depth of the folds of more than 40% of the core diameter is unattainable due to the fragility of the design of the profiled lead wire - core blanks.

Currently, the Barnaul cartridge plant developed drawings of the proposed cartridge. Research work has been carried out, pilot batches of cartridges of the proposed design have been manufactured and tested, which confirm the prospects and effectiveness of their use. A decision was made to organize the production of cartridges.

Claims (4)

1. A small arms cartridge containing an encapsulated sleeve with a propelling charge and a bullet consisting of a lead core and a shell, characterized in that the lead core is made with three or more longitudinal folds on its side surface formed by stamping by closing longitudinal cuts made in the core blank, while the depth of said folds is 25-40% of the core diameter. 2. The cartridge according to claim 1, characterized in that the longitudinal folds are evenly distributed along the side surface of the lead core. 3. The cartridge according to claim 1, characterized in that the longitudinal folds on the side surface of the lead core are made along its entire length. 4. The cartridge according to claim 1, characterized in that the width of the notches in the core blank is 6 - 15% of its diameter.

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