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EP1988355A1 - Projectile generating flashes of light - Google Patents

Projectile generating flashes of light Download PDF

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Publication number
EP1988355A1
EP1988355A1 EP08290277A EP08290277A EP1988355A1 EP 1988355 A1 EP1988355 A1 EP 1988355A1 EP 08290277 A EP08290277 A EP 08290277A EP 08290277 A EP08290277 A EP 08290277A EP 1988355 A1 EP1988355 A1 EP 1988355A1
Authority
EP
European Patent Office
Prior art keywords
projectile
envelope
splinter
projectile according
casing
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Withdrawn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
EP08290277A
Other languages
German (de)
French (fr)
Inventor
Dominique Roux
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.)
Nexter Munitions SA
Original Assignee
Nexter Munitions SA
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 Nexter Munitions SA filed Critical Nexter Munitions SA
Publication of EP1988355A1 publication Critical patent/EP1988355A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F42B12/34—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect expanding before or on impact, i.e. of dumdum or mushroom 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
    • F42B12/02—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
    • F42B12/367—Projectiles fragmenting upon impact without the use of explosives, the fragments creating a wounding or lethal effect

Definitions

  • the technical field of the invention is that of projectiles and in particular projectiles of medium caliber (caliber less than or equal to 50 mm).
  • the patent FR-2673461 thus proposes a fragmentable perforating projectile whose body contains a mass of inert compression material (for example an elastomer or a metal powder). The material is compressed in a bore of the body and exerts a prestress on the latter. During the impact on a target the additional stress applied to the body of the projectile causes its fragmentation.
  • inert compression material for example an elastomer or a metal powder
  • the known concepts not only make it possible to avoid the use of explosive and means of initiation, but they also make it possible to reduce the lethal radius of the projectile. Splinters remain in a smaller area and collateral effects are minimized.
  • EP1000311 The concepts proposed by EP1000311 are also difficult to implement in medium caliber. It is difficult to associate for a caliber less than 50 mm a body cylindrical chip generator with a bearing structure ensuring the ballistic trajectory of the projectile.
  • the warhead which is essential for the ballistic flight of the projectile must not disturb the effect on the target of the splinter generating body and its filling. It must therefore be as thin as possible. It must, however, withstand the constraints of shooting and implementation in the weapon.
  • EP1000311 consider (without specifying the caliber) a variant in which the warhead is filled with a filling material.
  • EP-1000311 one of the essential features of the concept proposed by EP-1000311 is the existence of a planar face at the front of the chip generator, which face impacts on the target and at which the filling material is compressed and can exert a radial stress on the generator of fragments.
  • the object of the invention is to propose a projectile of medium caliber generating splinters and implementing an inert loading, projectile in which the operation at impact is ensured as well as the mechanical and ballistic resistance of the projectile.
  • the projectile according to the invention is simple and inexpensive to manufacture.
  • the subject of the invention is thus a splinter-generating projectile comprising a perforating envelope enclosing an expanding material capable under the pressure of perforation of accelerating radially the material of the envelope, projectile comprising at its front end a ballistic ogive, projectile characterized in that the expanding material extends beyond the perforating envelope to fill substantially the entire internal volume to the warhead and thus ensure the mechanical strength of the latter.
  • the ballistic warhead will preferably have a front portion having a substantially constant thickness and less than or equal to one millimeter.
  • the perforating envelope is sub-calibrated and disposed inside a projectile body.
  • Training means will be provided to ensure the rotational drive of the perforating envelope by the body.
  • These drive means may comprise a conical bearing surface of the body cooperating with a complementary bearing carried by a rear face of the casing.
  • the drive means may comprise a threading formed on the outer cylindrical surface of the casing and cooperating with a complementary tapping carried by the body.
  • the envelope may have a front portion extending forward of the body.
  • the front portion of the envelope may thus extend substantially to the ogive and the expanding material will include an annular bearing bearing against the cylindrical front face of the envelope.
  • the perforating envelope may constitute the actual body of the projectile.
  • the warhead will then have a thick rear portion that will be placed in a bore of the body and which will end with a thinned front portion.
  • the projectile generating chips according to the invention will have a caliber less than or equal to 50 mm.
  • a projectile 1 fragment generator according to a first embodiment of the invention comprises a substantially cylindrical body 2 which ends at its rear part by a solid bottom 3.
  • the body 2 carries a sealing belt 4 and a rear groove 5 for fixing it by crimping on a socket (not shown).
  • the body 2 here constitutes a perforating envelope generating splinters. It is made of a dense material, for example steel.
  • the body 2 is extended at its front by a ballistic ogive 6 which is made of a light material such as an aluminum alloy or a plastic or composite material.
  • the nose 6 has a thin front portion 6a extended by a rear portion 6b thick which is placed in a bore 7 of the body 2.
  • the nose 6 is fixed to the body 2 by threading or crimping.
  • the body 2 contains an expanding material 8 capable, under the pressure due to the perforation, of accelerating the material of the body radially 2.
  • an expanding material 8 capable, under the pressure due to the perforation, of accelerating the material of the body radially 2.
  • a material of low density will be adopted with respect to to the material of the spark generator envelope 2.
  • a plastic material or aluminum may be used. This material will be machined to the desired shape before being placed in the body 2.
  • the bottom 11 of the bore 7 is conical. This conicity ensures the rotational drive of the material 8 by the body 2 when firing the projectile.
  • the expanding material 8 extends beyond the perforating envelope formed by the body 2 to fill substantially all the internal volume to the ogive 6.
  • the material 8 thus ensures the mechanical strength of the ogive 6, both during the handling phases or implementation in the weapon, as the ballistic trajectory of the projectile.
  • This mechanical strength is ensured despite the reduced thickness of the front portion 6a of the nose 6.
  • This thickness is substantially constant at the front portion 6a and is less than or equal to 1 millimeter.
  • the front portion 6a of the warhead 6 extends over a length L which corresponds substantially to half the total length of the warhead.
  • the rear portion 6b has a cylindrical internal bore 9.
  • the internal profile of the ogive 6 thus passes at a plane perpendicular to the axis 18 of the projectile of a portion 6a, thin and of substantially constant thickness, to a thick rear portion 6b which extends the body 2 of the projectile.
  • the expanding material 8 contained in the front part 6a of the warhead will cause the shear of the latter substantially at the plane 10.
  • the ogive 6 does not interfere with the interaction of the projectile with the target.
  • the material 8 will thus be compressed inside the bore 7, extended by the bore 9. This will result in a radial stress on the rear part 6b of the nose and then on the body 2 and the formation of splinters .
  • the advantage of this embodiment is that the projectile structure is extremely simple. It is the body 2 that plays the role of splinter generator. The filling material 8 is manufactured separately and is then placed in the body 2. The ogive 6 is finally attached to the body and completes the structure of the projectile.
  • the figure 2 shows another embodiment of the invention in which is implemented a fragment generator of different structure.
  • the chip generator here comprises a perforating envelope 12 enclosing the expanding material 8.
  • This perforating envelope 12 is under-calibrated and disposed inside a projectile body 2.
  • tungsten envelope may be made to meet certain operational characteristics (density and desired volume for the chips).
  • the body 2 is here made of aluminum alloy. It comprises an internal bore which comprises a cylindrical bearing surface 13 ensuring radial retention of the casing 12.
  • the internal bore also comprises a conical rear bearing surface 14 which cooperates with a complementary bearing surface secured to a rear face of the casing 12.
  • This conical bearing surface 14 constitutes a means for ensuring the rotational drive of the perforating casing 12 by the body 2.
  • the bore internal to the body 2 extends behind the casing 12 by a cylindrical portion 15. Furthermore the casing 12 has a front portion 12a which extends forward of the body 2 over a length 1.
  • the front portion 12a of the envelope thus extends substantially to the nose 6.
  • the widening material 8 completely fills the envelope 12 and it also fills the inside of the front portion 6a of the nose 6.
  • the expanding material thus comprises an annular bearing surface 16 bearing against the front cylindrical face of the casing 12. This support prevents any shearing of the ogive 6 by the casing during the handling and firing phases of the projectile.
  • the nose 6 has a rear portion 6b thicker and which is fixed on an outer cylindrical surface 17 of the body 2, for example by threading or crimping.
  • the material 8 ensures the mechanical strength of the nose 6 during the phases preceding the impact on a target, despite the reduced thickness of the warhead.
  • the material 8 located inside the front part of the nose 6 is deformed and causes an expansion of the warhead.
  • the latter is detached from the body 2 at the level of the span 17 and it is also sheared by the front portion of the envelope 12.
  • the disturbances caused to the envelope 12 are therefore minimized.
  • the envelope 12 impacts the target and the material 8 ensures the fragmentation of the envelope 12. Note that, the envelope 12 extending in front of the body 2, it does not interfere either the generation of chips by the 'envelope.
  • the density of the body 2 is very different from that of the envelope 12 (steel or tungsten alloy).
  • the body 2 thus makes it possible to position the casing in a relatively advanced manner relative to the body which facilitates the generation of splinters while ensuring the ballistic profile necessary for the flight of the projectile.
  • the bore 15 may if necessary allow to position a complementary balancing ballast or it may receive a pyrotechnic composition to provide a complementary effect after target perforation.
  • a pyrotechnic composition may be provided.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

The projectile (1) has a body (2) forming a perforating envelope that encloses expanding material (8). The expanding material radially accelerates material of the envelope under pressure due to perforation. A ballistic warhead (6) is provided at front end of the projectile. The expanding material is extended beyond the envelope for filling entire internal volume of the warhead and ensuring mechanical holding of the warhead. The material has an annular face (16) supported against a cylindrical front surface of the envelope.

Description

Le domaine technique de l'invention est celui des projectiles et en particulier des projectiles de moyen calibre (calibre inférieur ou égal à 50 mm).The technical field of the invention is that of projectiles and in particular projectiles of medium caliber (caliber less than or equal to 50 mm).

Il est connu de réaliser des projectiles renfermant un chargement explosif dont l'initiation est commandée par un moyen d'amorçage tel une fusée. La détonation du chargement explosif provoque la génération d'une gerbe d'éclats.It is known to make projectiles containing an explosive charge whose initiation is controlled by a priming means such as a rocket. The detonation of the explosive charge causes the generation of a sheaf of shrapnel.

Depuis quelques années on cherche à améliorer la sécurité d'emploi des munitions en proposant des concepts de projectiles dépourvus de chargement explosif.In recent years, the aim has been to improve the safety of use of munitions by proposing projectile concepts without explosive charge.

Le brevet FR-2673461 propose ainsi un projectile perforant fragmentable dont le corps renferme une masse de matériau de compression inerte (par exemple un élastomère ou une poudre métallique). Le matériau est comprimé dans un alésage du corps et exerce une précontrainte sur ce dernier. Lors de l'impact sur une cible la contrainte supplémentaire appliquée au corps du projectile provoque sa fragmentation.The patent FR-2673461 thus proposes a fragmentable perforating projectile whose body contains a mass of inert compression material (for example an elastomer or a metal powder). The material is compressed in a bore of the body and exerts a prestress on the latter. During the impact on a target the additional stress applied to the body of the projectile causes its fragmentation.

Il a également été proposé par le brevet EP-1000311 un concept de projectile comprenant un étui cylindrique ouvert vers l'avant et rempli d'un matériau inerte. Lors de l'impact sur une cible le matériau de remplissage exerce une contrainte radiale sur l'étui provoquant sa fragmentation.It was also proposed by the patent EP-1000311 a projectile concept comprising a cylindrical case open forwards and filled with an inert material. During the impact on a target the filling material exerts a radial stress on the holster causing its fragmentation.

Les concepts connus permettent non seulement d'éviter l'emploi d'explosif et de moyens d'amorçage, mais ils permettent aussi de réduire le rayon de létalité du projectile. Les éclats restent dans une zone de dimensions plus réduite et les effets collatéraux sont donc minimisés.The known concepts not only make it possible to avoid the use of explosive and means of initiation, but they also make it possible to reduce the lethal radius of the projectile. Splinters remain in a smaller area and collateral effects are minimized.

Cependant les concepts connus présentent également des inconvénients.However, the known concepts also have disadvantages.

Ainsi, même si le projectile proposé par FR2673461 est un projectile de moyen calibre, le montage proposé impose une mise en précontrainte du corps. Il en résulte un surcoût de fabrication pour ce projectile et par ailleurs la reproductibilité du niveau de précontrainte obtenu, notamment après des périodes de stockage prolongé, n'est pas assurée.So, even if the projectile proposed by FR2673461 is a projectile of medium caliber, the proposed assembly imposes a prestressing of the body. This results in additional manufacturing cost for this projectile and also the reproducibility of the level of prestressing obtained, especially after periods of prolonged storage, is not ensured.

Les concepts proposés par EP1000311 sont par ailleurs délicats à mettre en oeuvre en moyen calibre. Il est difficile d'associer pour un calibre inférieur à 50 mm un corps cylindrique générateur d'éclats avec une structure d'emport assurant la trajectoire balistique du projectile.The concepts proposed by EP1000311 are also difficult to implement in medium caliber. It is difficult to associate for a caliber less than 50 mm a body cylindrical chip generator with a bearing structure ensuring the ballistic trajectory of the projectile.

Notamment, l'ogive qui est indispensable pour le vol balistique du projectile ne doit pas perturber l'effet sur la cible du corps générateur d'éclats et de son remplissage. Elle doit donc être la plus fine possible. Elle doit cependant résister aux contraintes de tir et de mise en oeuvre dans l'arme.In particular, the warhead which is essential for the ballistic flight of the projectile must not disturb the effect on the target of the splinter generating body and its filling. It must therefore be as thin as possible. It must, however, withstand the constraints of shooting and implementation in the weapon.

Ces deux exigences sont contradictoires et limitent les possibilités d'emploi d'un tel concept en moyen calibre.These two requirements are contradictory and limit the possibilities of use of such a concept in medium caliber.

On notera que EP1000311 envisage (sans préciser le calibre) une variante dans laquelle l'ogive est remplie d'un matériau de remplissage.It will be noted that EP1000311 consider (without specifying the caliber) a variant in which the warhead is filled with a filling material.

Cependant cette variante n'est que suggérée par ce brevet qui ne précise notamment pas comment un tel matériau est mis en place dans l'ogive, comment une telle ogive se fixe sur le générateur d'éclats, et dans quelle mesure le fonctionnement du générateur d'éclats est assuré malgré la présence de cette ogive pleine.However this variant is only suggested by this patent which does not specifically specify how such a material is placed in the warhead, how such a warhead is fixed on the chip generator, and how the operation of the generator of fragments is assured despite the presence of this full warhead.

En effet, une des caractéristiques essentielles du concept proposé par EP-1000311 est l'existence d'une face plane au niveau de l'avant du générateur d'éclats, face qui impacte sur la cible et au niveau de laquelle le matériau de remplissage se trouve comprimé et peut exercer une contrainte radiale sur le générateur d'éclats.Indeed, one of the essential features of the concept proposed by EP-1000311 is the existence of a planar face at the front of the chip generator, which face impacts on the target and at which the filling material is compressed and can exert a radial stress on the generator of fragments.

L'ogive pleine décrite par EP-1000311 ne peut que perturber le fonctionnement du générateur d'éclats.The full warhead described by EP-1000311 can only disrupt the operation of the chip generator.

L'invention a pour but de proposer un projectile de moyen calibre générateur d'éclats et mettant en oeuvre un chargement inerte, projectile dans lequel le fonctionnement à l'impact est assuré ainsi que la tenue mécanique et balistique du projectile.The object of the invention is to propose a projectile of medium caliber generating splinters and implementing an inert loading, projectile in which the operation at impact is ensured as well as the mechanical and ballistic resistance of the projectile.

Par ailleurs le projectile selon l'invention est de fabrication simple et peu coûteuse.Furthermore, the projectile according to the invention is simple and inexpensive to manufacture.

L'invention a ainsi pour objet un projectile générateur d'éclats comprenant une enveloppe perforante renfermant un matériau élargisseur capable sous la pression due à la perforation d'accélérer radialement le matériau de l'enveloppe, projectile comportant à son extrémité avant une ogive balistique, projectile caractérisé en ce que le matériau élargisseur s'étend au-delà de l'enveloppe perforante pour remplir sensiblement tout le volume interne à l'ogive et assurer ainsi la tenue mécanique de cette dernière.The subject of the invention is thus a splinter-generating projectile comprising a perforating envelope enclosing an expanding material capable under the pressure of perforation of accelerating radially the material of the envelope, projectile comprising at its front end a ballistic ogive, projectile characterized in that the expanding material extends beyond the perforating envelope to fill substantially the entire internal volume to the warhead and thus ensure the mechanical strength of the latter.

L'ogive balistique comportera de préférence une partie avant ayant une épaisseur sensiblement constante et inférieure ou égale à un millimètre.The ballistic warhead will preferably have a front portion having a substantially constant thickness and less than or equal to one millimeter.

Suivant un mode particulier de réalisation, l'enveloppe perforante est sous calibrée et disposée à l'intérieur d'un corps de projectile.According to a particular embodiment, the perforating envelope is sub-calibrated and disposed inside a projectile body.

Des moyens d'entraînement seront prévus pour assurer l'entraînement en rotation de l'enveloppe perforante par le corps.Training means will be provided to ensure the rotational drive of the perforating envelope by the body.

Ces moyens d'entraînement pourront comprendre une portée conique du corps coopérant avec une portée complémentaire portée par une face arrière de l'enveloppe.These drive means may comprise a conical bearing surface of the body cooperating with a complementary bearing carried by a rear face of the casing.

Alternativement, les moyens d'entraînement pourront comprendre un filetage réalisé sur la surface cylindrique externe de l'enveloppe et coopérant avec un taraudage complémentaire porté par le corps.Alternatively, the drive means may comprise a threading formed on the outer cylindrical surface of the casing and cooperating with a complementary tapping carried by the body.

L'enveloppe pourra présenter une partie avant s'étendant en avant du corps.The envelope may have a front portion extending forward of the body.

La partie avant de l'enveloppe pourra ainsi s'étendre sensiblement jusqu'à l'ogive et le matériau élargisseur comportera une portée annulaire en appui contre la face cylindrique avant de l'enveloppe.The front portion of the envelope may thus extend substantially to the ogive and the expanding material will include an annular bearing bearing against the cylindrical front face of the envelope.

Selon un autre mode de réalisation, l'enveloppe perforante pourra constituer le corps même du projectile.According to another embodiment, the perforating envelope may constitute the actual body of the projectile.

L'ogive comportera alors une partie arrière épaisse qui sera mise en place dans un alésage du corps et qui se terminera par une partie avant amincie.The warhead will then have a thick rear portion that will be placed in a bore of the body and which will end with a thinned front portion.

Le projectile générateur d'éclats selon l'invention aura un calibre inférieur ou égal à 50 mm.The projectile generating chips according to the invention will have a caliber less than or equal to 50 mm.

L'invention sera mieux comprise à la lecture de la description qui va suivre de différents modes de réalisation, description faite en référence aux dessins annexés et dans lesquels:

  • la figure 1 est une vue en coupe longitudinale d'un projectile selon un premier mode de réalisation de l'invention,
  • la figure 2 est une vue en coupe longitudinale d'un projectile selon un second mode de réalisation de l'invention.
The invention will be better understood on reading the following description of various embodiments, description made with reference to the accompanying drawings and in which:
  • the figure 1 is a longitudinal sectional view of a projectile according to a first embodiment of the invention,
  • the figure 2 is a longitudinal sectional view of a projectile according to a second embodiment of the invention.

En se reportant à la figure 1, un projectile 1 générateur d'éclats selon un premier mode de réalisation de l'invention comprend un corps 2 sensiblement cylindrique qui se termine à sa partie arrière par un fond 3 massif. Le corps 2 porte une ceinture d'étanchéité 4 ainsi qu'une gorge arrière 5 permettant sa fixation par sertissage sur une douille (non représentée).Referring to the figure 1 , a projectile 1 fragment generator according to a first embodiment of the invention comprises a substantially cylindrical body 2 which ends at its rear part by a solid bottom 3. The body 2 carries a sealing belt 4 and a rear groove 5 for fixing it by crimping on a socket (not shown).

Le corps 2 constitue ici une enveloppe perforante génératrice d'éclats. Il est réalisé en un matériau dense, par exemple en acier.The body 2 here constitutes a perforating envelope generating splinters. It is made of a dense material, for example steel.

Le corps 2 est prolongé à sa partie avant par une ogive balistique 6 qui est réalisée en un matériau léger tel qu'un alliage d'aluminium ou bien une matière plastique ou composite.The body 2 is extended at its front by a ballistic ogive 6 which is made of a light material such as an aluminum alloy or a plastic or composite material.

L'ogive 6 comporte une partie avant mince 6a prolongée par une partie arrière 6b épaisse qui est mise en place dans un alésage 7 du corps 2. L'ogive 6 est fixée au corps 2 par filetage ou sertissage.The nose 6 has a thin front portion 6a extended by a rear portion 6b thick which is placed in a bore 7 of the body 2. The nose 6 is fixed to the body 2 by threading or crimping.

Selon une caractéristique importante de l'invention, le corps 2 renferme un matériau élargisseur 8 capable, sous la pression due à la perforation, d'accélérer radialement le matériau du corps 2. Comme matériau élargisseur 8 on adoptera un matériau de faible densité par rapport au matériau de l'enveloppe génératrice d'éclats 2. On pourra par exemple utiliser une matière plastique ou bien de l'aluminium. Ce matériau sera usiné à la forme souhaité avant d'être mis en place dans le corps 2.According to an important characteristic of the invention, the body 2 contains an expanding material 8 capable, under the pressure due to the perforation, of accelerating the material of the body radially 2. As the expanding material 8, a material of low density will be adopted with respect to to the material of the spark generator envelope 2. For example, a plastic material or aluminum may be used. This material will be machined to the desired shape before being placed in the body 2.

Le fond 11 de l'alésage 7 est conique. Cette conicité assure l'entraînement en rotation du matériau 8 par le corps 2 lors du tir du projectile.The bottom 11 of the bore 7 is conical. This conicity ensures the rotational drive of the material 8 by the body 2 when firing the projectile.

Selon une autre caractéristique importante de l'invention le matériau élargisseur 8 s'étend au-delà de l'enveloppe perforante formée par le corps 2 pour remplir sensiblement tout le volume interne à l'ogive 6.According to another important characteristic of the invention the expanding material 8 extends beyond the perforating envelope formed by the body 2 to fill substantially all the internal volume to the ogive 6.

Le matériau 8 assure ainsi la tenue mécanique de l'ogive 6, tant lors des phases de manipulation ou de mise en oeuvre dans l'arme, que sur la trajectoire balistique du projectile.The material 8 thus ensures the mechanical strength of the ogive 6, both during the handling phases or implementation in the weapon, as the ballistic trajectory of the projectile.

Grâce au matériau 8 cette tenue mécanique est assurée malgré l'épaisseur réduite de la partie avant 6a de l'ogive 6. Cette épaisseur est sensiblement constante au niveau de la partie avant 6a et elle est inférieure ou égale à 1 millimètre.With the material 8 this mechanical strength is ensured despite the reduced thickness of the front portion 6a of the nose 6. This thickness is substantially constant at the front portion 6a and is less than or equal to 1 millimeter.

On voit sur la figure 1 que la partie avant 6a de l'ogive 6 s'étend sur une longueur L qui correspond sensiblement à la moitié de la longueur totale de l'ogive. On remarque également que la partie arrière 6b présente un alésage interne 9 cylindrique.We see on the figure 1 that the front portion 6a of the warhead 6 extends over a length L which corresponds substantially to half the total length of the warhead. We also note that the rear portion 6b has a cylindrical internal bore 9.

Le profil interne de l'ogive 6 passe ainsi au niveau d'un plan 10 perpendiculaire à l'axe 18 du projectile d'une partie 6a, mince et à épaisseur sensiblement constante, à une partie arrière 6b épaisse qui prolonge le corps 2 du projectile. A l'impact le matériau élargisseur 8 contenu dans la partie avant 6a de l'ogive va provoquer le cisaillement de cette dernière sensiblement au niveau du plan 10. L'ogive 6 ne gène donc pas l'interaction du projectile avec la cible.The internal profile of the ogive 6 thus passes at a plane perpendicular to the axis 18 of the projectile of a portion 6a, thin and of substantially constant thickness, to a thick rear portion 6b which extends the body 2 of the projectile. At impact the expanding material 8 contained in the front part 6a of the warhead will cause the shear of the latter substantially at the plane 10. The ogive 6 does not interfere with the interaction of the projectile with the target.

Le matériau 8 se trouvera donc comprimé à l'intérieur de l'alésage 7, prolongé par l'alésage 9. Il en résultera une contrainte radiale sur la partie arrière 6b de l'ogive puis sur le corps 2 et la formation d'éclats.The material 8 will thus be compressed inside the bore 7, extended by the bore 9. This will result in a radial stress on the rear part 6b of the nose and then on the body 2 and the formation of splinters .

L'avantage de ce mode de réalisation est que la structure du projectile est extrêmement simple. C'est le corps 2 qui joue le rôle de générateur d'éclats. Le matériau de remplissage 8 est fabriqué d'une façon séparée puis il est mis en place dans le corps 2. L'ogive 6 est enfin fixée au corps et complète la structure du projectile.The advantage of this embodiment is that the projectile structure is extremely simple. It is the body 2 that plays the role of splinter generator. The filling material 8 is manufactured separately and is then placed in the body 2. The ogive 6 is finally attached to the body and completes the structure of the projectile.

La figure 2 montre un autre mode de réalisation de l'invention dans lequel on met en oeuvre un générateur d'éclats de structure différente.The figure 2 shows another embodiment of the invention in which is implemented a fragment generator of different structure.

Le générateur d'éclats comprend ici une enveloppe perforante 12 renfermant le matériau élargisseur 8. Cette enveloppe perforante 12 est sous calibrée et disposée à l'intérieur d'un corps 2 de projectile.The chip generator here comprises a perforating envelope 12 enclosing the expanding material 8. This perforating envelope 12 is under-calibrated and disposed inside a projectile body 2.

On pourra ainsi réaliser l'enveloppe 12 en un matériau de nature différente de celui du corps 2. On pourra par exemple réaliser une enveloppe en tungstène pour répondre à certaines caractéristiques opérationnelles (densité et volume souhaité pour les éclats).It will thus be possible to produce the envelope 12 in a material of a different nature from that of the body 2. For example, a tungsten envelope may be made to meet certain operational characteristics (density and desired volume for the chips).

Le corps 2 est ici réalisé en alliage d'aluminium. Il comporte un alésage interne qui comprend une portée cylindrique 13 assurant le maintien radial de l'enveloppe 12.The body 2 is here made of aluminum alloy. It comprises an internal bore which comprises a cylindrical bearing surface 13 ensuring radial retention of the casing 12.

L'alésage interne comporte aussi une portée arrière conique 14 qui coopère avec une portée complémentaire solidaire d'une face arrière de l'enveloppe 12. Cette portée conique 14 constitue un moyen permettant d'assurer l'entraînement en rotation de l'enveloppe perforante 12 par le corps 2.The internal bore also comprises a conical rear bearing surface 14 which cooperates with a complementary bearing surface secured to a rear face of the casing 12. This conical bearing surface 14 constitutes a means for ensuring the rotational drive of the perforating casing 12 by the body 2.

On voit sur la figure 2 que l'alésage interne au corps 2 se prolonge en arrière de l'enveloppe 12 par une partie cylindrique 15. Par ailleurs l'enveloppe 12 présente une partie avant 12a qui s'étend en avant du corps 2 sur une longueur 1.We see on the figure 2 that the bore internal to the body 2 extends behind the casing 12 by a cylindrical portion 15. Furthermore the casing 12 has a front portion 12a which extends forward of the body 2 over a length 1.

La partie avant 12a de l'enveloppe s'étend ainsi sensiblement jusqu'à l'ogive 6. Le matériau élargisseur 8 remplit complètement l'enveloppe 12 et il remplit aussi l'intérieur de la partie avant 6a de l'ogive 6.The front portion 12a of the envelope thus extends substantially to the nose 6. The widening material 8 completely fills the envelope 12 and it also fills the inside of the front portion 6a of the nose 6.

Le matériau élargisseur comporte ainsi une portée annulaire 16 en appui contre la face cylindrique avant de l'enveloppe 12. Cet appui évite tout cisaillement de l'ogive 6 par l'enveloppe au cours des phases de manipulation et de tir du projectile.The expanding material thus comprises an annular bearing surface 16 bearing against the front cylindrical face of the casing 12. This support prevents any shearing of the ogive 6 by the casing during the handling and firing phases of the projectile.

L'ogive 6 comporte une partie arrière 6b plus épaisse et qui se fixe sur une portée cylindrique externe 17 du corps 2, par exemple par filetage ou sertissage.The nose 6 has a rear portion 6b thicker and which is fixed on an outer cylindrical surface 17 of the body 2, for example by threading or crimping.

Là encore le matériau 8 assure donc la tenue mécanique de l'ogive 6 au cours des phases précédant l'impact sur une cible, et ce malgré l'épaisseur réduite de l'ogive.Here again the material 8 ensures the mechanical strength of the nose 6 during the phases preceding the impact on a target, despite the reduced thickness of the warhead.

Au moment de l'impact sur une cible le matériau 8 situé à l'intérieur de la partie avant de l'ogive 6 est déformé et il provoque un élargissement de l'ogive. Cette dernière se désolidarise du corps 2 au niveau de la portée 17 et elle est par ailleurs cisaillée par la partie avant de l'enveloppe 12.At the moment of the impact on a target, the material 8 located inside the front part of the nose 6 is deformed and causes an expansion of the warhead. The latter is detached from the body 2 at the level of the span 17 and it is also sheared by the front portion of the envelope 12.

Les perturbations occasionnées à l'enveloppe 12 sont donc minimisées. L'enveloppe 12 impacte la cible et le matériau 8 assure la fragmentation de l'enveloppe 12. On notera que, l'enveloppe 12 s'étendant en avant du corps 2, ce dernier ne gêne pas non plus la génération des éclats par l'enveloppe.The disturbances caused to the envelope 12 are therefore minimized. The envelope 12 impacts the target and the material 8 ensures the fragmentation of the envelope 12. Note that, the envelope 12 extending in front of the body 2, it does not interfere either the generation of chips by the 'envelope.

On remarque sur la figure 2 qu'il est possible de jouer sur le positionnement axial de l'enveloppe 12 par rapport au corps 2 pour régler la position du centre de gravité du projectile.We notice on the figure 2 it is possible to play on the axial positioning of the envelope 12 relative to the body 2 to adjust the position of the center of gravity of the projectile.

En effet la densité du corps 2 (matériau léger tel qu'un alliage d'aluminium) est très différente de celle de l'enveloppe 12 (acier ou alliage de tungstène). Le corps 2 permet ainsi de positionner l'enveloppe d'une façon relativement avancée par rapport au corps ce qui facilite la génération d'éclats tout en assurant le profil balistique nécessaire au vol du projectile.Indeed, the density of the body 2 (light material such as an aluminum alloy) is very different from that of the envelope 12 (steel or tungsten alloy). The body 2 thus makes it possible to position the casing in a relatively advanced manner relative to the body which facilitates the generation of splinters while ensuring the ballistic profile necessary for the flight of the projectile.

L'alésage 15 pourra le cas échéant permettre de positionner un lest d'équilibrage complémentaire ou bien il pourra recevoir une composition pyrotechnique permettant d'apporter un effet complémentaire après perforation de cible. On pourra prévoir par exemple une composition incendiaire.The bore 15 may if necessary allow to position a complementary balancing ballast or it may receive a pyrotechnic composition to provide a complementary effect after target perforation. For example, an incendiary composition may be provided.

A titre de variante on pourra assurer l'entraînement en rotation de l'enveloppe 12 par le corps 2 par des moyens différents. On pourra ainsi supprimer la portée conique 14 et donner à l'enveloppe 12 une face arrière plane coopérant avec un lamage plan du corps 2. On prévoira alors un filetage sur la surface cylindrique externe de l'enveloppe 12. Ce filetage coopérera avec un taraudage complémentaire réalisé sur l'alésage interne du corps 2, notamment au niveau de la portée cylindrique 13As a variant it will be possible to ensure the rotation of the casing 12 by the body 2 by different means. It will thus be possible to eliminate the conical bearing surface 14 and to give the casing 12 a plane rear face cooperating with a planar counterbore of the body 2. A thread will then be provided on the outer cylindrical surface of the casing 12. This thread will cooperate with a tapping. complementary made on the internal bore of the body 2, especially at the level of the cylindrical seat 13

Claims (11)

Projectile (1) générateur d'éclats comprenant une enveloppe perforante (2,12) renfermant un matériau élargisseur (8) capable sous la pression due à la perforation d'accélérer radialement le matériau de l'enveloppe (2,12), projectile comportant à son extrémité avant une ogive balistique (6), projectile caractérisé en ce que le matériau. élargisseur (8) s'étend au-delà de l'enveloppe perforante (2,12) pour remplir sensiblement tout le volume interne à l'ogive (6) et assurer ainsi la tenue mécanique de cette dernière.Projectile (1) chip generator comprising a perforating envelope (2, 12) enclosing a widening material (8) capable under pressure due to the perforation of accelerating radially the material of the envelope (2, 12), a projectile comprising at its front end a ballistic ogive (6), projectile characterized in that the material. expander (8) extends beyond the perforating envelope (2,12) to fill substantially all the internal volume to the warhead (6) and thus ensure the mechanical strength of the latter. Projectile générateur d'éclats selon la revendication 1, caractérisé en ce que l'ogive balistique (6) comporte une partie avant (6a) ayant une épaisseur sensiblement constante et inférieure ou égale à un millimètre.Splinter projectile according to claim 1, characterized in that the ballistic ogive (6) has a front portion (6a) having a substantially constant thickness and less than or equal to one millimeter. Projectile générateur d'éclats selon une des revendications 1 ou 2, caractérisé en ce que l'enveloppe perforante (12) est sous calibrée et disposée à l'intérieur d'un corps (2) de projectile.Splinter projectile according to one of claims 1 or 2, characterized in that the perforating envelope (12) is sub-calibrated and disposed within a projectile body (2). Projectile générateur d'éclats selon la revendication 3, caractérisé en ce que des moyens d'entraînement (14) sont prévus pour assurer l'entraînement en rotation de l'enveloppe perforante (12) par le corps (2).Splinter projectile according to claim 3, characterized in that drive means (14) are provided for driving the perforating casing (12) in rotation through the body (2). Projectile générateur d'éclats selon la revendication 4, caractérisé en ce que les moyens d'entraînement comprennent une portée conique (14) du corps (2) coopérant avec une portée complémentaire portée par une face arrière de l'enveloppe (12).Splinter projectile according to claim 4, characterized in that the drive means comprise a conical seat (14) of the body (2) cooperating with a complementary bearing carried by a rear face of the casing (12). Projectile générateur d'éclats selon la revendication 4, caractérisé en ce que les moyens d'entraînement comprennent un filetage réalisé sur la surface cylindrique externe de l'enveloppe et coopérant avec un taraudage complémentaire porté par le corps.Splinter projectile according to claim 4, characterized in that the drive means comprise a thread formed on the outer cylindrical surface of the casing and cooperating with a complementary tapping carried by the body. Projectile générateur d'éclats selon une des revendications 3 à 6, caractérisé en ce que l'enveloppe (12) présente une partie avant (12a) s'étendant en avant du corps (2).Splinter projectile according to one of claims 3 to 6, characterized in that the casing (12) has a front portion (12a) extending in front of the body (2). Projectile générateur d'éclats selon la revendication 7, caractérisé en ce que la partie avant (12a) de l'enveloppe (12) s'étend sensiblement jusqu'à l'ogive (6) et en ce que le matériau élargisseur (8) comporte une portée annulaire (16) en appui contre la face cylindrique avant de l'enveloppe (12).Splinter projectile according to Claim 7, characterized in that the front part (12a) of the envelope (12) extends substantially as far as the warhead (6) and in that the expanding material (8) has an annular bearing (16) bearing against the front cylindrical face of the casing (12). Projectile générateur d'éclats selon une des revendications 1 ou 2, caractérisé en ce que l'enveloppe perforante constitue le corps (2) même du projectile.Splinter projectile according to one of claims 1 or 2, characterized in that the perforating envelope constitutes the body (2) itself of the projectile. Projectile générateur d'éclats selon la revendication 9, caractérisé en ce que l'ogive (6) comporte une partie arrière (6b) épaisse qui est mise en place dans un alésage (7) du corps (2) et qui se termine par une partie avant amincie (6a).Splinter projectile according to claim 9, characterized in that the nose (6) has a thick rear part (6b) which is placed in a bore (7) of the body (2) and which ends with a front portion thinned (6a). Projectile générateur d'éclats selon une des revendications 1 à 10, caractérisé en ce qu'il a un calibre inférieur ou égal à 50 mm.Splinter projectile according to one of claims 1 to 10, characterized in that it has a gauge less than or equal to 50 mm.
EP08290277A 2007-04-30 2008-03-26 Projectile generating flashes of light Withdrawn EP1988355A1 (en)

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FR0703127A FR2915563B1 (en) 2007-04-30 2007-04-30 FLASH GENERATOR PROJECTILE

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2407747A3 (en) * 2010-07-12 2015-02-18 Explosia a.s. Projectile with tubular penetrator

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Publication number Priority date Publication date Assignee Title
CH536481A (en) * 1971-03-29 1973-06-15 Oerlikon Buehrle Ag Sabot bullet and process for its manufacture
US4301737A (en) * 1979-10-04 1981-11-24 The United States Of America As Represented By The Secretary Of The Army Multi-purpose kinetic energy projectile
EP0146745A1 (en) * 1983-12-22 1985-07-03 Werkzeugmaschinenfabrik Oerlikon-Bührle AG Stabilised sub-calibre multi-purpose missile
FR2673461A1 (en) 1991-02-28 1992-09-04 Giat Ind Sa PERFORATING AND FRAGMENTABLE PROJECTILE.
EP0989381A2 (en) * 1999-02-25 2000-03-29 Oerlikon Contraves Pyrotec AG Subcalibre projectile
EP1000311A1 (en) 1997-01-08 2000-05-17 Geke Ingenieurbüro Projectile or warhead
EP1316774A1 (en) * 2001-11-28 2003-06-04 GEKE Technologie GmbH High penetration and lateral effect projectiles having an integrated fragment generator

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH536481A (en) * 1971-03-29 1973-06-15 Oerlikon Buehrle Ag Sabot bullet and process for its manufacture
US4301737A (en) * 1979-10-04 1981-11-24 The United States Of America As Represented By The Secretary Of The Army Multi-purpose kinetic energy projectile
EP0146745A1 (en) * 1983-12-22 1985-07-03 Werkzeugmaschinenfabrik Oerlikon-Bührle AG Stabilised sub-calibre multi-purpose missile
FR2673461A1 (en) 1991-02-28 1992-09-04 Giat Ind Sa PERFORATING AND FRAGMENTABLE PROJECTILE.
EP1000311A1 (en) 1997-01-08 2000-05-17 Geke Ingenieurbüro Projectile or warhead
EP0989381A2 (en) * 1999-02-25 2000-03-29 Oerlikon Contraves Pyrotec AG Subcalibre projectile
EP1316774A1 (en) * 2001-11-28 2003-06-04 GEKE Technologie GmbH High penetration and lateral effect projectiles having an integrated fragment generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2407747A3 (en) * 2010-07-12 2015-02-18 Explosia a.s. Projectile with tubular penetrator
CZ306529B6 (en) * 2010-07-12 2017-03-01 Explosia A.S. A projectile with a tubular penetrator

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FR2915563A1 (en) 2008-10-31

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