EP1336073A1 - Projectile contenant un noyau lourd entoure d'une chemise - Google Patents

Projectile contenant un noyau lourd entoure d'une chemise

Info

Publication number
EP1336073A1
EP1336073A1 EP01982958A EP01982958A EP1336073A1 EP 1336073 A1 EP1336073 A1 EP 1336073A1 EP 01982958 A EP01982958 A EP 01982958A EP 01982958 A EP01982958 A EP 01982958A EP 1336073 A1 EP1336073 A1 EP 1336073A1
Authority
EP
European Patent Office
Prior art keywords
core
jacket
projectile
parts
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01982958A
Other languages
German (de)
English (en)
Inventor
Björn Erik WOLD
Knut R. Kristensen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nammo Raufoss AS
Original Assignee
Nammo Raufoss AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nammo Raufoss AS filed Critical Nammo Raufoss AS
Publication of EP1336073A1 publication Critical patent/EP1336073A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/02—Driving bands; Rotating bands
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
    • F42B12/44—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information of incendiary type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/72—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material
    • F42B12/76—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing
    • F42B12/78—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the material of the casing of jackets for smallarm bullets ; Jacketed bullets or projectiles

Definitions

  • the present invention relates to a projectile which contains a heavy core surrounded by a jacket.
  • the penetration capability also is a function of the core diameter, and more precisely it is inversely proportional to the core diameter.
  • the following empirical formula has been derived for determination of the penetration capability:
  • C is a constant determined by the type of target and the shape of the core
  • m is the mass of the core
  • v is the impact velocity
  • D is the diameter of the core.
  • a subcalibre core necessitates a lining around the core, and as such lining is among else used a plastics jacket.
  • a charge usually an incendiary charge, may be situated in front of the core inside of the jacket.
  • a heavy and hard material for instance tungsten, tungsten carbide or hardened, alloyed steel.
  • the use of a plastics jacket is, however, limited to small calibre projectiles, as the plastics jacket will not withstand the strains of propulsing itself and the remainder of the projectile in rotation in the barrel of the weapon. Rotation is achieved in that the jacket is deformed into the rifles in the barrel, whereby the jacket is forced to rotate during the launching.
  • the jacket causes sealing for the propulsive gases.
  • deformation means a weakening of the plastics jacket.
  • a plastics jacket is unfavourable because it results in that the projectile has a small mass adjacent the periphery. This reduces the stability of the projectile in the trajectory. Pure plastics materials, therefore, have only been used for light projectiles, i.e. without a heavy core.
  • a jacket has not been used for armour piercing projectiles of larger calibre of more than about 15 mm, because the jacket, like plastics jackets for small calibre ammunition, will not withstand the strains of propulsing itself and the remainder of the projectile in rotation in the barrel of the weapon. It must be taken into consideration the enormous acceleration, also angular acceleration, which the launching entails. (For instance up to about 100000 G in linear acceleration). Therefore, guide bands of metal or plastics have been used, mounted in a circumferential groove in the projectile, in order to cause sealing for the propulsive gases and rotation, in that the guide band is deformed into the rifles in the barrel. As metal in such guide bands alloyed copper, soft steel and galvanized steel have been used.
  • An object of the present invention is to solve the problems related to the use of plastics jackets for projectiles which are to be driven in rotation in weapon barrels.
  • the invention relates to a projectile which contains a heavy core surrounded by a jacket, and is characterized in that the jacket is of plastics and is formed by two parts, with a circumferential partition, that a metal band is mounted about the partition between the jacket parts, and that the jacket parts are glued to the core.
  • the metal ring is mounted in connection with the joining of the jacket parts.
  • Each jacket part has a step on the end which is to be joined to the other jacket part, whereby the steps together form a circumferential groove in which the metal ring will be situated when the jacket parts are connected.
  • the jacket parts are glued to the core, in order to be kept on the core, and in order to be able to move the core; i.e. to impart angular acceleration to the core, during the launching.
  • the metal band causes rotation of the projectile in the barrel of the weapon and causes sealing for the propulsion gases during the launching.
  • the metal band can be made of tombac.
  • the metal band is pressed radially due to the rifles in the barrel, and the pressing increases the fixing of the metal ring against the jacket and secures transmission of torque thereto.
  • the metal ting is favourable in that it increases the mass of the jacket around the circumference and thereby improves the stability of the projectile in the trajectory.
  • incendiary charge may be placed in front of the core inside the jacket.
  • a core of hard metal for instance tungsten or tungsten carbide, may be used, but the core may be lighter than for armour piercing ammunition.
  • the core may be weakened by recesses or incisions, in order to burst in the impact.
  • the jacket including the metal band, will be cheaper to manufacture than a continuous metal jacket.
  • the fixing of the metal ring with respect to transfer of torque can be secured by mounting of the jacket parts mutually spaced and by pressing the metal ring into a groove in the core.
  • the groove may be formed with a pattern of flutes which prevent mutual rotation of the metal ring and the core.
  • rings can be mounted in the grooves in order to take up the pressure during launching.
  • the rings must fill up the grooves axially.
  • the rings have no influence with respect to the tensile strain which occurs in the core in an inclined impact, and do not prevent that the core bursts into fragments.
  • Fig. 1 shows a longitudinal section through an armour piercing projectile according to the invention.
  • Fig. 2 shows a longitudinal section through a practice projectile according to the invention.
  • Fig. 3 shows a segment of a projectile according to the invention, with a metal ring pressed into the core.
  • Fig. 4 shows a segment of a core included in the projectile according to the invention, with a ring inserted in a weakening groove in the core.
  • the Figs. 1 and 2 will be described as a whole.
  • the Figs show projectiles having a heavy core surrounded by a jacket of plastics, formed by a front part 1 and a rear part 2.
  • the jacket parts 1 , 2 are glued to the core 4.
  • a metal ring 3 is mounted in a circumferential groove formed at the transition between the jacket parts 1 and 2.
  • the jacket parts 1 and 2 are shown mutually spaced. Thereby, tolerances with respect to the length of the metal parts 1 and 2 are avoided.
  • Fig. 1 shows an armour piercing projectile, and the core 4 is of hard metal and is rounded on the front end. Alternatively the core 4 may be more or less pointed. As material may as example be used tungsten, tungsten carbide or alloyed, hardened steel.
  • the chamber 6 in the nose portion of the projectile may be filled with an incendiary charge.
  • the practice projectile shown in Fig. 2 contains a core 4, which does not need to be of hard metal, as the purpose is to impart the desired ballistic properties to the projectile.
  • the core 4 is shown having blunt ends, as it shall not have any penetrating effect in a target. In order that the core shall not ricochet undivided by inclined impact against a target surface, the core 4 has weakening grooves 5, which will cause that the core will fragmentize by impact.
  • Fig. 3 shows how this can be achieved.
  • the metal ring 3 has an inner, circumferential rib, and upon mounting of the metal ring 3 about the jacket parts 1 and 2 the metal ring 3 is compressed such that the rib protrudes into a circumferential groove in the core 4.
  • the groove may have flutes in the axial direction of the projectile, whereby the metal ring 3 cannot rotate relatively to the core 4. Thereby, a large torque can be transmitted from the metal ring 3 to the core 4.
  • the metal ring 3 is mounted in connection with the mounting of the jacket parts 1 and 2 on the core 4, in that the metal ring 3 is moved axially onto the jacket part 1 prior to mounting of the jacket part 2.
  • the metal ring 3 By launching in a rifled weapon barrel the metal ring 3 is pressed against the jacket part 2 because the metal ring 3 is deformed by the rifles.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

L'invention porte sur un projectile contenant un noyau lourd (4) entouré d'une chemise, cette chemise étant en plastique et constituée de deux parties (1, 2) avec cloison circonférentielle. Une bande métallique (3) est montée autour de la cloison entre les parties chemise et forme une bande de guidage, les parties chemise (1, 2) étant collées au noyau.
EP01982958A 2000-11-03 2001-11-02 Projectile contenant un noyau lourd entoure d'une chemise Withdrawn EP1336073A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO20005573A NO312608B1 (no) 2000-11-03 2000-11-03 Prosjektil som inneholder en tung kjerne som er omgitt av en mantel
NO20005573 2000-11-03
PCT/NO2001/000439 WO2002044645A1 (fr) 2000-11-03 2001-11-02 Projectile contenant un noyau lourd entoure d'une chemise

Publications (1)

Publication Number Publication Date
EP1336073A1 true EP1336073A1 (fr) 2003-08-20

Family

ID=19911759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01982958A Withdrawn EP1336073A1 (fr) 2000-11-03 2001-11-02 Projectile contenant un noyau lourd entoure d'une chemise

Country Status (5)

Country Link
EP (1) EP1336073A1 (fr)
AU (1) AU2002214417A1 (fr)
CA (1) CA2427675A1 (fr)
NO (1) NO312608B1 (fr)
WO (1) WO2002044645A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2387049T3 (es) * 2007-07-02 2012-09-12 Saltech Ag Proyectil para munición de armas de fuego manuales
US8286558B2 (en) 2010-04-22 2012-10-16 Liberty Ammunition, Inc. Thermoset polymer guide band for projectiles
CH706574B1 (de) * 2012-06-06 2019-12-30 Saltech Ag Übungsprojektil und Übungspatrone.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL302814A (fr) * 1963-03-27
DE1286703B (de) * 1966-03-11 1969-01-09 Rheinmetall Gmbh Verfahren zur Herstellung von Zerfallkoerpern fuer UEbungsmunition
US3861311A (en) * 1973-07-13 1975-01-21 Us Air Force Plastic semi armor piercing incendiary projectile
DE3009774C2 (de) * 1980-03-14 1986-03-06 Mauser-Werke Oberndorf Gmbh, 7238 Oberndorf Geschoß, insbesondere panzerbrechendes Geschoß

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0244645A1 *

Also Published As

Publication number Publication date
AU2002214417A1 (en) 2002-06-11
WO2002044645A1 (fr) 2002-06-06
CA2427675A1 (fr) 2002-06-06
NO20005573D0 (no) 2000-11-03
NO20005573L (no) 2002-05-06
NO312608B1 (no) 2002-06-03

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 20030519

AK Designated contracting states

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

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Effective date: 20040602