RU2262651C2 - Armor-piercing bullet - Google Patents

Abstract

FIELD: ammunition for individual automatic small-arms in firing at lightly armored targets.

SUBSTANCE: proposed armor-piercing bullet has bimetallic case, armor-piercing core and jacket; geometric shapes of bullet are changed; optimal geometric sizes of external outlines of armor-piercing core and assembled bullet are proposed. Bullet has ogival head section, leading section, intermediate section and tail taper section with flat rear end; it consists of bimetallic case with bottom in tail section whose inner and outer lateral surfaces are stepped in form, steel core secured in bimetallic case over its inner surfaces of intermediate and tail sections and partially protruding and having blunt area in nose section, ogival section, cylindrical section, engageable with intermediate taper section and tail taper section narrowing towards rear flat end and jacket made from soft material and placed in cavity between core and bimetallic envelope in at least zone of leading section of bullet; intermediate section of bullet is cylindrical in shape.

EFFECT: facilitated procedure of manufacture of bullet; enhanced armor-piercing and accuracy of fire.

4 cl, 2 dwg

Description

The invention relates to ammunition mainly of 9 mm caliber, designed for firing from individual automatic small arms at lightly armored targets.

Known armor-piercing bullet according to the patent of the Russian Federation No. 2077021, IPC 6 F 42 B 30/02, 12/06, publ. 04/10/97, this bullet contains a shell, the inner and outer side surfaces of which are stepped. The bullet has a sequentially located head ogival part, a protruding leading part, a gauge centering part and a tail conical part. An armor-piercing core is placed in the shell along the inner surface of the centering and tail parts, and a shirt is placed in the cavity between the core and the leading and head parts of the shell.

The disadvantages of this bullet include the low manufacturability of its assembly due to the fact that the central part of the core is cylindrical, which, on the one hand, makes it difficult to assemble it with an interference fit, and on the other hand, to facilitate assembly, it does not allow proper density during assembly. The execution of the Central part of the core is cylindrical also leads to a decrease in its breakdown property, since part of the kinetic energy of the bullet is spent on separating the core from the shirt and shell. In addition, the implementation of the peaked core complicates the technology of its manufacture and reduces the breakdown properties of the core over metal barriers.

Known bullet according to the patent of the Russian Federation No. 2089839, IPC 6 F 42 B 30/02, publ. 09/10/97, According to this patent, the bullet does not differ in design parameters from the above, however, it proposes specific geometric parameters for the external contour of the bullet itself and its armor-piercing core. This pool has the same disadvantages as the above.

Known armor-piercing bullet for the second version of the patent of the Russian Federation No. 2112206, IPC 6 F 42 B 30/02, 12/04, publ. 05/27/98, which is the closest analogue to the declared armor-piercing bullet in the number of matching essential features and is selected as a prototype. According to this patent, the bullet contains a shell, the inner and outer surfaces of which are stepped, and has a head, leading intermediate conical and tail parts and a jacket and core located in the shell, having a head, tail and intermediate parts between them, while the intermediate part of the core is made in in the form of a conjugate cylindrical adjacent to the head, and conical adjacent to the tail, sections.

This bullet in comparison with the above is more technologically advanced both in the manufacture of the core and in its assembly, and also has greater efficiency in armor penetration. However, the lack of manufacturability of the assembly of the bullet itself and the entire cartridge has disadvantages due to the presence of an intermediate conical part on the outer surface of the shell. The presence of this section also worsens the aerodynamic characteristics of the bullet, reducing its stability on the trajectory and thereby reducing its accuracy. In addition, this patent claims only the general principle of bullet layout. The absence of an indication of the specific ratio of the parameters of the bullet and its core does not allow us to uniquely identify its aerodynamic and combat qualities.

The invention solves the problem of improving the manufacturability of the manufacture of bullets, including armor-piercing core, and also solves the problem of increasing armor penetration and accuracy.

The problem is solved in that in the armor-piercing pool containing a bimetallic shell, armor-piercing core and shirt, the geometric shapes of the assembled bullet have been changed, and the optimal geometric dimensions of the outer contours of both the armor-piercing core and the assembled bullet have been proposed.

It is proposed in an armor-piercing pool with a lively head part, a leading part, an intermediate part and a tail conical part with a flat rear end, consisting of a bimetallic shell with a bottom in the tail part, the inner and outer side surfaces of which are stepped, a steel core fixed in a bimetallic shell along its inner surfaces of the intermediate and tail parts and partially protruding in the head of the bullet from the shell having a blunting in the bow, the animating part, the cylinder the other part, conjugated between the intermediate conical and tail conical parts, tapering to the rear flat end, and also a shirt made of soft material and placed in the cavity between the core and the bimetallic shell, at least in the area of the leading part of the bullet, the intermediate part of the bullet run cylindrical.

Moreover, the bullet is made with the following geometric dimensions: the total length of the bullet (4.3 ÷ 4.55) d, the length of the bullet head (1.7 ÷ 1.9) d, the radius of curvature of the outer surface of the bullet head (3.0 ÷ 3.2) d, the length of the core protruding from the shell (0.6 ÷ 0.75) d, the total length of the intermediate cylindrical and tail conical parts of the bullet (1.3 ÷ 1.5) d, the length of the tail conical part of the bullet, tapering to the rear flat end (0.8 ÷ 1.0) d, where d is the caliber of the bullet. The leading part of the bullet can be made conical with a taper angle facing the apex equal to 1 '÷ 10'. The diameter of the cylindrical intermediate part of the bullet is less than the diameter of the mating portion of the leading part of the bullet by 0.15 ÷ 0.25 mm.

An armor-piercing core is performed with the following ratios of geometric dimensions: core length (4.2 ÷ 4.4) d, length of the animated part of the core (1.7 ÷ 1.9) d, radius of curvature of the animated part of the core (5.3 ÷ 5.6 ) d, the total length of the head and cylindrical parts of the core (2.4 ÷ 2.5) d, the diameter of the cylindrical part of the core (0.82 ÷ 0.86) d, the length of the tail conical part of the core (0.65 ÷ 1.0) d. The diameter of the blunting of the bow of the core (0.2 ÷ 0.25) d and can reach 1.8 ÷ 2.5 mm. Moreover, the taper angle of the intermediate conical part of the core is 10 '÷ 30', and the taper angle of the tail parts of the bullet and core is 15 ° ÷ 20 °.

Figure 1 presents a longitudinal section of a bullet assembly, and figure 2 - its core.

The bullet consists of a steel core 1, a shirt 2 made of soft material and placed between the outer bimetallic shell 3 and the core 1.

The bullet is made with ogival head part 4, the leading part 5, the intermediate cylindrical part 6 and the tail conical part 7, tapering to the rear flat end 8.

The core 1 is made with an animated head part 9, a leading cylindrical part 10, an intermediate conical part 11 and a tail conical part 12, tapering to the rear flat end. The core has a flat blunting 13 at the apex.

The blunting of the core at the apex of the bullet up to 2.5 mm and, as a result, the increase in the radius of curvature of its animate part, on the one hand, increased the manufacturability of the core, and on the other hand, increased its impact strength with, as a result, an increase penetration when firing at metal sheets on the principle of "knocking the cork" without destroying the core.

To assess the impact of a bullet, tests were conducted for 9 mm bullets. Penetration tests were carried out from a ballistic barrel (the length of the threaded portion of the barrel is 160 ... 165 mm) using a standard procedure, which showed that a bullet at an average flight speed of 305 ... 315 m / s provides 100% penetration of the number of credited hits 6 mm sheet and 90% penetration of 7 mm steel sheet St.3 at a distance of 100 m at an angle of 90 ° to the horizon and direction of fire, although 80% penetration is provided for according to TU.

An increase in the core blunting diameter and the radius of curvature of the head part of the core increased its mass. In order to preserve the mass of the bullet as a whole, its length is reduced in comparison with the regular bullet, which simultaneously with the execution of the outer surface of the shell of the intermediate part of the cylindrical bullet increased the stability of the bullet in flight and, consequently, increased the accuracy of its hit.

Claims (4)

1. An armor-piercing bullet made with an animated head part, a leading part, an intermediate part and a tail conical part with a flat rear end and consisting of a bimetallic shell with a bottom in the tail conical part, the inner and outer side surfaces of which are stepped, of a steel core fixed in bimetallic shell on its inner surfaces of the intermediate and tail parts, partially protruding in the head of the bullet from the shell and having a blunting in the bow, lively part, a cylindrical part, an intermediate conical and tail conical parts, tapering to the rear flat end, and also a shirt made of soft material and placed in the cavity between the core and the bimetallic shell, at least in the area of the leading part of the bullet, characterized in that the intermediate part of the bullet is cylindrical, while the bullet is made with the following size ratios: total length of the bullet (4.3 ÷ 4.55) d, length of the bullet head (1.7 ÷ 1.9) d, radius of curvature of the outer surface of the head bullets (3.0 ÷ 3.2) d, the length of the tail conical part of the bullet (0.8 ÷ 1.0) d, the total length of the intermediate cylindrical and tail conical parts of the bullet (1.3 ÷ 1.5) d, the length of the protruding part of the core from the shell (0.6 ÷ 0 , 75) d, a core has the following size ratios: core length (4.2 ÷ 4.4) d, blunting diameter of the bow of the core (0.2 ÷ 0.25) d, length of the core revitalization (1.7 ÷ 1.9) d, the radius of curvature of the animated part of the core (5.3 ÷ 5.6) d, the total length of the head and cylindrical parts of the core (2.4 ÷ 2.5) d, the diameter of the cylindrical part of the core (0.82 ÷ 0 , 86) d, tail length the new conical part of the core (0.65 ÷ 1.0) d, where d is the caliber of the bullet, and the taper angle of the intermediate conical part of the core is 10'-30 ', and the taper angle of the tail parts of the bullet and core is 15-20 °. 2. The bullet according to claim 1, characterized in that the blunting of the core in the bow is made with a diameter of 1.8-2.5 mm. 3. The bullet according to claim 1, characterized in that the leading part of the bullet is made conical with a taper angle facing the apex equal to 1'-10 '. 4. The bullet according to claim 1 or 3, characterized in that the diameter of the cylindrical intermediate part of the bullet is less than the diameter of the mating portion of the leading part of the bullet by 0.15-0.25 mm.

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