RU2410635C1 - Fire arm round bullet - Google Patents

Abstract

FIELD: weapons and ammunition. ^ SUBSTANCE: invention relates to small arms, particularly, to round bullets. Round bullet consists of bimetal shell accommodating a core. Said bimetal shell has cylindrical outer surface and curvilinear head part. Said outer cylindrical surface has grooves with depth making 0.4-0.9 of barrel bore rifling groove ledge height. Grooves are made at the angle to bullet lengthwise axis in number multiple of the number of barrel bore rifling groove ledges. ^ EFFECT: higher accuracy of hits. ^ 6 cl, 3 dwg

Description

The invention relates to the field of small arms ammunition, in particular to the design of small arms cartridges.

Known 9-mm pistol cartridge, consisting of an encapsulated guillotine with a propelling charge and a bullet with a bimetallic shell, a lead shirt and a steel core, index 57-H-181C (drawing 4-27147, holder of the original documents in military unit 64176).

One of the disadvantages of this cartridge is the low accuracy of fire.

The prototype of the invention is a 5.45 mm cartridge, consisting of an encapsulated sleeve with a powder charge and a bullet with a shell and a lead core (drawing IZHMV 771811.005, the holder of the original documents - Closed Joint-Stock Company Barnaul Cartridge Plant. See RF patent No. 22245508 " Bullet cartridge small arms. "The bullet cartridge prototype consists of a bimetallic shell with a curved radial head part and a lead core mounted in its cavity. On the inner surface of the head part of the shell and an annular shoulder limiting the movement of the lead core to the shell. The wall thickness is formed in place of the ledge 30 to 65% of its thickness.

The disadvantages of the known design prototype can also include low accuracy of fire.

The problem to which the present invention is directed, is to eliminate the disadvantages of the prototype and create a bullet having a higher accuracy of fire compared to the prototype.

The task set by the invention is achieved by the fact that on the outer cylindrical surface of the bimetallic shell at an angle to the longitudinal axis in an amount multiple of the number of protrusions of the grooves of the barrel of a small arms, grooves are made with a depth equal to 0.4 ... 0.9 of the height of the protrusions of the grooves of the barrel channel.

At least one compression girdle is made from the end face of the bullet to a width of 0.2 ... 0.4 caliber.

The angle of inclination of the grooves on the outer cylindrical surface of the shell is made equal to the angle of inclination of the protrusions of the weapons used and is 2 ... 8 °.

The length of the grooves on the cylindrical surface of the shell is made equal to 0.4 ... 1.4 caliber.

The front of the grooves at the boundary of the transition of the shell from the cylindrical part to the head is made with the expansion.

Each groove of the shell in cross section is made with a bevel in the direction opposite to the combat face of the rifling of the bore.

The novelty of the proposed technical solution is the implementation on the outer cylindrical surface of the bimetallic shell at an angle to the longitudinal axis of the bullet in an amount multiple of the number of protrusions of the grooves of the barrel of a small arms, grooves with a depth equal to 0.4 ... 0.9 of the height of the protrusions of the grooves of the barrel.

Thus, the presence of grooves on the outer cylindrical surface of the shell, a multiple of the number of protrusions of the rifling of the bore, allows the bullet and the cartridge as a whole in the chamber of the gun to orientally orient themselves while charging the arms, to cover directly the grooves of the rifling of the bore of the barrel without applying significant effort, and their depth 0.4 ... 0.9 the height of the protrusions of the grooves of the barrel bore together with the compression girdle completely covers the gap between the shell of the bullet and the grooves of the barrel bore and thereby does not allow inject gas flow into the gaps between the shell and the grooves of the bore, which increases the ballistic characteristics of the bullet. In this case, in the presence of grooves pre-formed on the surface of the shell surface, less effort is spent on the formation of these grooves by rifling the barrel channel and less effort on the passage and rotation of the bullet during movement along the barrel channel. Additionally, during the flight of the bullet to the target, the started rotation of the bullet in the barrel channel continues, since there is no protrusion from the side opposite the combat ledge, which prevents rotation, which ultimately leads to more accurate shooting and reduced wear of the barrel channel.

These signs, according to a search for analogues in patent and information sources, are new, non-obvious, industrially feasible and aimed at achieving the objectives of the invention to obtain a bullet with increased accuracy of fire.

The signs of the angle of inclination of the grooves on the outer cylindrical surface of the shell equal to the angle of inclination of the protrusions of the weapons used, amounting to 2 ... 8 °, allows you to install the bullet in the chamber in a oriented manner without significant effort and thereby create optimal conditions for achieving the objectives of the invention.

The presence of at least one compression girdle from the end face of the bullet to a width of 0.12 ... 0.4 caliber reliably prevents the penetration of powder gases between the bullet and rifling of the barrel bore during movement along the barrel channel and reduces forces and loads on the shell of the bullet and rifling because the belt has a width much smaller than the entire cylindrical part of the shell of the bullet.

The execution of each shell groove in cross section with a bevel to the side opposite from the combat face of the bore of the barrel channel due to the presence of the shell metal in the beveled part of the groove creates an additional seal between the shell and the grooves, which guarantees the prevention of the penetration of powder gases through the grooves of the barrel channel, reduces wear barrel, thereby contributing to the achievement of the objectives of the invention.

Figure 1 schematically presents the proposed bullet.

Figure 2 shows the cross section of the bullet with grooves made with bevels in the direction opposite to the combat face of the rifled barrel channel.

Figure 3 shows a scan of the grooves on the cylindrical surface of the shell with an extension towards the head of the bullet with a curved radial head part.

The proposed bullet comprises a shell with a curved radial head part with grooves 2 and a compression belt 3 made on its outer cylindrical surface at an angle to the axis 3. A lead core 4 is mounted in the cavity of the shell 1. The grooves 2 are made in cross section with the bevel 5 in the direction opposite to combat faces of the rifling of the bore, and with an extension of 6 in the front. The combat faces of the grooves of the barrel channel during the movement of the bullet along the barrel channel are in contact with the faces of 7 grooves 2.

The cartridge of small arms with the proposed bullet works as follows.

During the filing of the cartridge into the barrel of the small arms made with an extension of 6 towards the head of the bullet, the grooves 2 cover the protrusions of the rifling of the barrel, thereby contributing to the oriented installation of the bullet and the cartridge as a whole in the chamber of the small arms.

The implementation of the grooves 2 on the shell of the bullet is a multiple of the number of grooves in the barrel channel, namely, when the number of grooves 2 is doubled or tripled, etc., the oriented installation of the bullet and the cartridge as a whole in the chamber is even more facilitated, since the bullet and cartridge when installed in the chamber must be rotated at a smaller angle.

When a bullet is fired and the bullet begins to move along the bore, each or multiple face of 7 grooves 2, in contact with the combat face of each rifle of the bore, starts to move forward and simultaneously rotate, and when the bullet leaves the bore, the rotation of the bullet continues due to one-sided contact of the face 7 shell 1 with air. The bevels 5, made in the groove 2, reduce the gap between the rifling of the bore and the outer surface of the shell, which increases the effect of powder gases on the bullet and contributes to its additional rotation.

The implementation of the grooves along the length of 0.4 ... 1.4 caliber allows you to use this design feature on bullets having, respectively, the length of the cylindrical part equal to 0.4 ... 1.4 caliber.

The use of the proposed design bullet is possible in small arms cartridges of various calibers.

Currently, the Barnaul cartridge plant has developed working drawings of the proposed cartridge. Research work has been carried out, pilot batches of cartridges with the proposed bullet have been manufactured and tested, which confirm the prospects and effectiveness of their use.

It was decided to organize the production of the proposed cartridges.

Claims (6)

1. Bullet cartridge small arms, consisting of a bimetallic shell with a cylindrical outer surface and a curved radial head and mounted in its cavity core, characterized in that on the outer cylindrical surface of the bimetallic shell at an angle to the longitudinal axis of the bullet in the number of multiple protrusions of the channel cuts the barrel of the small arms made grooves with a depth of 0.4 ... 0.9 the height of the protrusions of the rifling of the bore. 2. The bullet according to claim 1, characterized in that at least one compression belt is made from the end face of the bullet to a width of 0.2 ... 0.4 caliber. 3. The bullet according to claim 1, characterized in that the angle of inclination of the grooves on the outer cylindrical surface of the shell is made equal to the angle of inclination of the protrusions of the weapon used and is 2 ... 8 degrees. 4. The bullet according to claim 1, characterized in that the length of the grooves on the cylindrical surface of the shell is made equal to 0.4 ... 1.4 caliber. 5. The bullet according to claim 1, characterized in that the front of the grooves at the boundary of the transition of the shell from the cylindrical part to the head is made with the expansion. 6. The bullet according to claim 1, characterized in that each shell groove in cross section is beveled to the side opposite from the combat face of the barrel channel cut.

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