A spinning warhead for extending the life of gun barrels

Abstract

The present invention provides a spinning bullet that can extend the life of a gun barrel. The bullet is designed with two centrosymmetrical semi-enclosed spiral grooves at the bottom of the bullet. The spiral grooves extend into the interior of the bullet, forming two small cavities at the bottom of the bullet. When the gunpowder in the cartridge case is ignited by the bullet primer, the high-temperature and high-pressure gas generated in the cartridge case will act on the bottom of the bullet and the two small cavities. The spiral grooves of the small cavities have an inclined surface that is not perpendicular to the force of the high-temperature and high-pressure gas, and part of the gas pressure can be used for the rotation of the bullet, so that the bullet has an initial rotation speed at the time of instantaneous firing, which improves the existing mode in which the bullet can only rotate by rifling. In a smoothbore gun barrel, this bullet can obtain a certain rotation speed without relying on rifling.

Description

Technical Field

[0001] The invention relates to a mechanical processing technology in the military field, in particular to a spinning warhead capable of extending the service life of a gun barrel. Background Art

[0002] The problem of extending the service life of gun barrels has long restricted the improvement of comprehensive performance of weapons and the long-term performance of combat effectiveness. Extending the service life of gun barrels is an urgent need for modernization and future battlefields. Today, a lot of research has been conducted on the technology of extending the service life of gun barrels from the aspects of improving propellants, surface treatment of barrel inner bore, optimizing projectile and rifling design, improving gun barrel steel materials, and anti-ablation technology.

[0003] This patent focuses on the shape of the bullet and designs a spinning bullet that can pre-rotate when fired. It provides new ideas for my country in the field of extending the life of gun barrels, and provides inspiration for exploring new life extension technologies. It can also provide reference and reference for extending the service life of barrels and improving the combat effectiveness of artillery. Summary of the invention

[0004] Purpose: Aiming at the defects of the existing gun barrel life extension technology, as a supplement to the existing gun barrel life extension technology, the purpose of the present invention is to provide a spinning bullet that can obtain an initial rotation velocity through gunpowder drive, which can extend the service life of the gun barrel and save expenses for national defense.

[0005] Technical solution: To achieve the above purpose, the present invention provides a spinning bullet that prolongs the life of a gun barrel. The specific technical solution is to design and process two centrosymmetrical semi-closed spiral grooves on the bottom edge of the bullet. The spiral grooves extend to the inside of the bullet, and half of the length of the spiral grooves is hidden below the bottom surface of the bullet, forming two small cavities at the bottom of the bullet, like a snail shell. When the bullet primer ignites the gunpowder in the shell, the high-temperature and high-pressure gas generated in the shell will act on the bottom of the bullet and the two small cavities. The spiral grooves of the small cavity have a curved surface that is not perpendicular to the force of the high-temperature and high-pressure gas. This part of the gas entering the small cavity causes the bullet to rotate along its own axis. Therefore, the bullet has an initial rotation speed at the time of instantaneous firing, which improves the existing mode that the bullet can only rotate by rifling, and can greatly reduce the friction between the side of the bullet and the rifling. In a smoothbore gun barrel, this bullet can also obtain a certain rotation speed without relying on the rifling. In order to meet the processing requirements of the small cavity at the bottom of the bullet, the spin bullet material in the present invention needs to use a certain thickness of stainless steel or brass material at the bottom, while the lead material inside the bullet is the same as that of a conventional bullet.

[0006] Beneficial effects:

[0007] (1) The spinning bullet can be used on modern rifle and artillery barrels to reduce the frictional thermal shock of the bullet on the gun barrel before it leaves the barrel. Since part of the charge energy causes the bullet to rotate, the utilization rate of the charge by the bullet is improved.

[0008] (2) It can effectively achieve a shorter exit time. The superposition of the initial rotation velocity provided by the high-temperature and high-pressure gas and the rotation of the bullet forced by the rifling of the gun barrel can shorten the time it takes for the bullet to exit the barrel.

[0009] (3) A higher rotation speed can be effectively achieved. By changing the rifling to match the initial rotation speed provided by the high-temperature and high-pressure gas, the bullet can achieve a higher rotation speed.

[0010] (4) A spinning bullet can be used in a smoothbore gun barrel, so that the bullet still has a certain rotation speed after leaving the barrel and the shooting accuracy can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The purpose and features of the present invention will become more apparent through the accompanying drawings:

[0012] Figure 1 This is a diagram of the spinning warhead model;

[0013] Figure 2 It is a three-dimensional diagram of the bottom of the spinning warhead (including three views and three-dimensional model);

[0014] Figure 3 This is a three-dimensional model diagram of the bottom of the spinning warhead;

[0015] Figure 4 This is a cross-sectional view of the spin warhead cavity; DETAILED DESCRIPTION

[0016] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for technical researchers in this field, some concepts and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0017] like Figure 1 As shown, the appearance of the spin warhead in this embodiment is not significantly different from that of the conventional warhead. The main difference is as follows: Figure 2 The bottom of the warhead is shown. Figure 2 The special structure of the bottom of the bullet is shown, and the two semi-closed spiral grooves are symmetrically distributed at the center of the bottom, which directly contact the charge in the shell. The bullet in the present invention can be made into a special structure that meets the design requirements by precision machining and additive manufacturing. Therefore, in the present invention, the thickness of the material used in the bottom will be thicker than that of a conventional bullet.

[0018] In this embodiment, a semicircular groove is designed inside the small cavity, such as Figure 3 , 4 As shown, in order to increase the area of ​​gas action, in order to simplify the description and take into account the difficulty of processing, only two cavities are designed in this embodiment. Theoretically, more gas acts on the angle surface perpendicular to the radius of the bottom circle of the bullet and the axis, and the higher the initial rotation velocity obtained by the bullet; under the premise of not destroying the mechanical structure of the bullet, according to the principle of lever, the closer the equivalent action surface is to the edge of the bullet, the higher the initial rotation velocity obtained.

Claims

1. A spinning bullet for extending the life of a gun barrel, characterized in that: A semi-closed spiral groove is designed at the bottom of the bullet to allow the bullet to rotate. The spiral groove is distributed symmetrically at the center of the bottom of the bullet to form a cavity, so that the high-temperature and high-pressure gas generated by the gunpowder acts on the plane formed by the axis and radius of the bullet, causing the bullet to generate an initial rotational velocity when it is fired instantly.

2. The spinning bullet for extending the life of a gun barrel according to claim 1, characterized in that: The semi-closed spiral groove is made of copper or stainless steel, the bottom material thickness is thicker than that of a conventional bullet, and the formed cavity structure is prepared by precision machining or additive manufacturing.

3. The spinning bullet for extending the life of a gun barrel according to claim 1, characterized in that: The number of the semi-closed spiral grooves is not limited. Under the premise of ensuring the linear motion of the bullet in the gun barrel, as long as the bullet axis is subjected to uniform force, the number of cavities formed by the semi-closed spiral grooves can be from one to multiple.

4. The spinning bullet for extending the life of a gun barrel according to claim 1, characterized in that: The size parameters of the semi-closed spiral groove vary according to different types of bullets.

5. The spinning bullet for extending the life of a gun barrel according to claim 1, characterized in that: The cavity formed by the semi-closed spiral groove can reduce the damage to the rifling of the gun barrel when generating the initial rotation velocity.

6. The spinning bullet for extending the life of a gun barrel according to claim 1, characterized in that: The initial rotation speed varies according to different types of bullets. When the number of rotations before leaving the barrel reaches about 1.7 weeks (approximately calculated based on a barrel length of 415mm, 4 right-hand rifling grooves, and a twist of 240mm), the bullet can be used in a smoothbore gun barrel.

7. The spinning bullet for extending the life of a gun barrel according to claim 1, characterized in that: The cavity structure at the bottom of the warhead can be processed integrally with the warhead, or can be processed separately as a sabot and matched with the warhead. After serving as a sabot, it can be separated from the warhead when the projectile is flying.

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