JPH06307800A - Launcher - Google Patents

Abstract

PURPOSE:To remarkably improve penetration without impairing a strength by mounting an auxiliary material having small specific gravity in a cylindrical state on an outer periphery of a rodlike launcher body formed of a large specific gravity material in a launcher to be used for a core for an armor-piercing. CONSTITUTION:A launcher body 1 is formed of a large specific gravity material such as rodlike sintered material formed by mixing and sintering 93wt.% of tungsten particles, 4.9wt.% of Ni particles and 2.1wt.% of Fe particles. An auxiliary material 2 made by molding a material having low specific gravity and low melting point such as plastic mixed with 70% of carbon-reinforced fiber is mounted on an outer periphery of the body to obtain a launcher 3 of a core for an armor-piercing, etc. Thus, the material 2 is preferentially melted by friction during penetrating of an armor, etc., to be easily separated from the body 1, and hence excellent penetration is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projectile used for a bullet armor for an armor-piercing bullet.

[0002]

2. Description of the Related Art A core for armor-piercing bullets is required to have high strength and toughness.
So-called heavy metal such as alloy sintered body is used. Since this bullet needs to be fired from a barrel or the like and penetrate deeply into a protective object, a material having a high specific gravity such as the above-mentioned heavy metal having good penetration is used. However, the penetrating amount of the armor for armor-piercing rounds should be as large as possible, and it is desired to develop a core that further improves the penetrating force currently obtained.

[0003]

The above-described bullet has a W-
Although an Fe-Ni alloy sintered body is widely used, an example of a method for manufacturing this sintered body will be described. As a main component, 85 to 98% by weight of tungsten and the balance Ni and Fe serving as binders are used. After preparing and mixing the powder, the powder is formed into a compact by CIP (cold isotropic working press) or the like, and then heated to a temperature above the liquidus temperature of the binder and sintered. Then, in order to improve the strength, it is preheated to 400 to 600 ° C. to carry out warm work strengthening such as swaging, and further post heat treatment (aging treatment) is carried out to increase the strength.

By the way, it is known that the penetrating force of the core is higher as the specific gravity of the core material is larger when the core is shot at the same speed, and the core using a W-Fe-Ni alloy sintered body is known. However, increasing the specific gravity can be expected to improve the penetrating power. However, the W-Fe-Ni alloy sintered body that has been conventionally used has a large amount of binder, and thus contains a large amount of tungsten having a large specific gravity in order to have a large specific gravity, and there is room for increasing the amount of tungsten. Is few. Moreover, if the amount of binder is further reduced by increasing the amount of tungsten, the ductility and toughness of the sintered body may be reduced. Moreover, even if the specific gravity of the core is increased as it is, the weight of the core increases, so the firing speed of the core decreases,
There is also the problem of impeding the ability to penetrate.

In addition to the method of increasing the specific gravity of the core material, a method of increasing the penetrating force by increasing the length of the core can be considered. However, if the length is simply increased, the weight is increased and the firing speed is reduced as in the case of increasing the specific gravity. Therefore, I thought about a method to reduce the weight of the core by suppressing the increase in weight, but if the diameter of the core is reduced, the strength will decrease, and the core will be damaged at the time of firing or when hitting the target object. It may happen.

Further, in general, a sabot having a large diameter is attached to the bullet so that the bullet has a large diameter and is detached from the bullet after the shot is started so that the cavity pressure of the barrel can be sufficiently received. However, the sabot that departs from the bullet after launching cannot be used for the bullet used in a flying object such as an airplane. this is,
This is because Savoie, who has left the core, may hit a moving vehicle. Therefore, in the past, the sabot and the bullet were integrated and hit the target as it was. However, if the sabot and the bullet are integrated in this way, the weight increases, so that there is a problem that the firing speed decreases and sufficient penetration performance cannot be obtained. The present invention has a basic object to solve the above problems, and an object thereof is to provide a projectile having improved penetrating power without impairing strength and the like.

[0007]

In order to solve the above problems, in the projectile of the present invention, an auxiliary material having a small specific gravity is cylindrically mounted on the outer periphery of a rod-shaped projectile body made of a large specific gravity material. It is characterized by The second invention is
The auxiliary material is made of a material having a melting point lower than that of the projectile body.

As the projectile body used in the present invention, W-Fe-Ni conventionally used as a projectile is used.
Examples include heavy metals such as alloy sintered bodies and depleted uranium materials. The auxiliary material to be attached to the outer circumference may be at least one having a specific gravity lighter than that of the projectile body, and preferably one having a low melting point. As the auxiliary material, an Al alloy material, a fiber reinforced plastic material or the like can be exemplified as one which satisfies these properties.

[0009]

That is, according to the present invention, by mounting an auxiliary material having a small specific gravity on the outer circumference of the projectile body made of a large specific gravity material, the strength is increased and the increase in weight is suppressed as much as possible to make the projectile thin. It is possible to increase the diameter and length. Thereby, the penetrating force of the projectile can be increased without deteriorating the strength and the like. Moreover, the auxiliary material attached to the outer periphery of the projectile body, when hitting armored objects,
Due to the difference in specific gravity from the projectile body, it is easy to peel and separate.
The main body of the projectile penetrates the armored object in a state close to that of a large specific gravity material. Therefore, the projectile exerts a higher penetration force as a large specific gravity material.

If a material having a melting point lower than that of the projectile body is used as the auxiliary material, the auxiliary material is preferentially melted by friction during penetration of an armored article and easily separated from the projectile body. , The penetration of the projectile will be improved. Also,
The length L of the projectile is sufficiently long to obtain sufficient penetrating force, and the diameter D is preferably as small as possible in order to suppress the increase in weight. The ratio L / D of L and D is 25 or more. Is desirable.

[0011]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 93% by weight of tungsten particles
And 4.9% by weight of Ni particles and 2.1% by weight of Fe particles were mixed and sintered to prepare a rod-shaped sintered body having a diameter of 8 mm and a length of 130 mm as the projectile body 1 of the example. Furthermore, the plastic compounded with 70% carbon reinforced fiber,
The auxiliary material 2 was formed by FW molding with a thickness of 2.5 mm and a length of 120 mm and mounted on the outer periphery of the projectile body 1. This projectile 3 had a length L of 130 mm, a diameter D of 13 mm, an L / D of 10, and an average specific gravity of 7.8. In addition, for comparison, a steel material consisting of JIS SCM440 alone is used as a rod-shaped projectile with a length of 130 mm and a diameter of 13 mm (specific gravity 7.8).
Was prepared as Comparative Example 1, and further the above W-Ni-Fe
As a comparative example 2, a rod-shaped projectile (specific gravity: 17.6) having a length of 100 mm and a diameter of 10 mm was prepared as a single sintered body. The weights of these projectiles were the same.

These projectiles were shot at an initial velocity v to hit an armored object, and the penetration amount P at that time was measured. The result is as shown in FIG. 2, and the steel projectile having a small specific gravity always has a lower penetration amount than the other projectiles regardless of the initial velocity. On the other hand, the projectile of the embodiment is W-Ni-F.
Despite the overall specific gravity being smaller than the sintered body, the penetration amount is superior to this sintered body. It is considered that this is because the projectile body of the embodiment preferentially penetrates the small-diameter projectile body when it penetrates. In the projectiles of the examples, no damage phenomenon was observed in the projectiles from low speed to high speed. Next, the projectiles of the examples were tested for the penetration amount when the length L / diameter D was changed at the same weight. As a result, it was revealed that the greater the value of L / D, the better the penetrating power, despite the same weight.
Then, when L / D is set to 25 or more, a sufficiently excellent penetrating force is obtained.

(Embodiment 2) Next, a projectile launched from a flying body such as an airplane will be described. A W-Ni-Fe sintered body made of the same material as in Example 1 was used as the projectile body 4.
Then, the auxiliary material 5 made of JIS A7075 Al alloy was attached to the outer periphery thereof. In addition to this projectile 6, W-Ni-Fe
A projectile (not shown) formed by using a sintered alloy and having the same shape as the above projectile was prepared, and each projectile was shot with the same cavity pressure to hit the target. As a result, the projectiles of Examples had a particularly high launch speed and a significantly improved penetration amount as compared with the comparative materials. It is considered that this is due to the synergistic effect of the increased launch speed and the separation of the main body and the auxiliary material in the penetration state of the projectile of the embodiment.

[0014]

As described above, according to the projectile of the present invention, since the auxiliary material having a small specific gravity is cylindrically attached to the outer periphery of the rod-shaped projectile body composed of the large specific gravity material, the strength is improved. The penetrability can be dramatically improved without impairing it. If a material having a melting point lower than that of the projectile body is used for the auxiliary material, the penetrability is further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a projectile according to an embodiment of the present invention. .

FIG. 2 is a graph showing the penetrability of Examples and Comparative Examples.

FIG. 3 is a graph showing the relationship between L / D and penetrability in Examples.

FIG. 4 is a cross-sectional view of a projectile of another embodiment.

[Explanation of symbols]

 1 Projector body 2 Auxiliary material 3 Projector 4 Projectile body 5 Auxiliary material 6 Projector

Claims (2)

[Claims] 1. A projectile characterized in that an auxiliary material having a small specific gravity is cylindrically mounted on the outer periphery of a rod-shaped projectile body composed of a large specific gravity material. 2. The projectile according to claim 1, wherein the auxiliary material is made of a material having a melting point lower than that of the projectile body.