Ammunition and explosives – Projectiles – Having jacket
Patent
1988-10-06
1989-11-07
Tudor, Harold J.
Ammunition and explosives
Projectiles
Having jacket
102518, 29 123, 29517, 294192, F42B 1108
Patent
active
048784346
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a penetrating projectile of a caliber equal or less than 40 mm.
The object of the invention is equally to provide a cartridge including such a penetrating projectile as well as a method of making the projectile.
Known penetrating projectiles most often comprise a jacket of ductile metal or alloy such as copper or brass which surrounds a core of hard metal such as hardened steel or of tungsten carbide embedded in lead.
The drawback of these projectiles lies in the fact that the attachment between the ductile outer jacket and the hard inner core is imperfect.
Thus, when the projectile is made to rotate under the influence of helical rifling in the barrel of a firearm shooting the projectile, slippage occurs between this jacket and the hard core, which substantially affects the penetrating power of the projectile.
In an embodiment described in French Patent No. 2 536 527, the rear portion of the core of the penetrating projectile is provided with a Morse taper which is socketed in a complementary cone formed in a guide or sabot of ductile metal, which thus comes to partially overlie the hard core.
This mode of assembly permits the achievement of good conditions for rotation of the core, and this projectile thus presents satisfactory penetrating power. Nevertheless, this method of assembly using cones with a Morse taper or auto-clamping cones is difficult to adapt to high volume industrial production. As a matter of fact, the use of Morse taper cones requires very high precision to obtain a perfect fit and without a gap between the guide and the rear face of the core.
In this embodiment, undulations are formed in the external surface of the guide in order to limit the friction between that external surface and the rifling formed in the barrel of a firearm. The creation of these undulations by machining, however, is expensive and involves wasting prime material.
In French Patent No. 2 191 718, there is described a penetrating projectile comprising a hard core, the rear part of which is overlaid by a guide or sabot of ductile material. Bonding of the guide on the core is obtained by soldering, brazing, gluing, casting, or by deposition of metal. These fixing techniques are equally difficult and burdensome to perform on an industrial scale.
In French Patent No. 764 833 a penetrating bullet comprises a hard core surrounded by a soft metal jacket which is attached to the core by means of an embossing or shrinking process which causes the soft metal to penetrate into hollows existing on the surface of the core. However, the external surface of the soft jacket remains smooth in such a way that the jacket presents a high frictional resistance at the time of its passage through a gun barrel.
The object of the present invention is to overcome the drawbacks of the known products by creating a penetrating projectile in which the core and the guide are attached together in a manner such that rotating the assembly takes place under optimal conditions and in which the guide presents undulations on its external surface which reduce the friction of the projectile against a gun barrel, such projectile being easy and inexpensive to manufacture.
The penetrating projectile of a caliber equal to or less than 40 mm which is the aim of the invention comprises a core having a front point, the core being composed of a hard and/or high density metal or metallic alloy, surrounded at the rear of the point by a generally cylindrical guide of ductile metal, the portion of the core which is surrounded by the guide being provided with projections and depressions and the guide being crimped on this portion of the core by radial compression such that the internal surface of the guide is gripped axially and rotationally to that part of the core by means of the projections and depressions of the latter.
According to the invention, the projectile is characterized in that the guide is crimped onto said part of the core by electromagnetic forming and in that said part of the core is provided with undulations, the int
REFERENCES:
patent: 1322662 (1919-11-01), Watson
patent: 1709414 (1929-04-01), Stendeback
patent: 1944884 (1934-01-01), Gerlich
patent: 3143966 (1964-08-01), Burns, Jr. et al.
patent: 4708063 (1987-11-01), Ladriere
patent: 4793037 (1988-12-01), Carter
Societe Francaise de Munitions
Tudor Harold J.
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