EP0391876B1 - Projectile perforant - Google Patents

Projectile perforant Download PDF

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Publication number
EP0391876B1
EP0391876B1 EP90850130A EP90850130A EP0391876B1 EP 0391876 B1 EP0391876 B1 EP 0391876B1 EP 90850130 A EP90850130 A EP 90850130A EP 90850130 A EP90850130 A EP 90850130A EP 0391876 B1 EP0391876 B1 EP 0391876B1
Authority
EP
European Patent Office
Prior art keywords
projectile
contact
nose cone
armour
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.)
Expired - Lifetime
Application number
EP90850130A
Other languages
German (de)
English (en)
Other versions
EP0391876A2 (fr
EP0391876A3 (fr
Inventor
Lars Karsberg
Hans Gustafsson
Hans-Erik Kropp
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.)
Saab Bofors AB
Original Assignee
Bofors AB
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 Bofors AB filed Critical Bofors AB
Publication of EP0391876A2 publication Critical patent/EP0391876A2/fr
Publication of EP0391876A3 publication Critical patent/EP0391876A3/fr
Application granted granted Critical
Publication of EP0391876B1 publication Critical patent/EP0391876B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/06—Electric contact parts specially adapted for use with electric fuzes
    • F42C19/07—Nose-contacts for projectiles or missiles

Definitions

  • the present invention relates to an armour-piercing projectile of the type which comprises a nose cone with a reinforced tip for mechanical penetration of reactive armour and an impact contact member, placed in the nose cone, for triggering the actuation part of the projectile upon impact against a target, the impact contact member consisting of a full-calibre double shell in which the casing of the projectile constitutes an outer shell and the inner shell consists of a separate contact cone.
  • a shaped charge comprises, in principle, an outer casing, a metal cone and an explosive.
  • the explosive detonates, the metal cone is flattened and a metal jet is formed which, with great force, penetrates even very thick and hard armour.
  • shaped charges have for a long time constituted a serious threat to armoured vehicles.
  • armoured targets can be provided with a reactive armour of the mounted type positioned immediately in front of or at a distance from the main armour of the target.
  • Such reactive armour can consist of two metal plates with an intermediate layer of explosive.
  • Such reactive armour normally impedes the shaped charge jet of a projectile, and its penetration capability is drastically reduced.
  • US Patent 4,831,936 previously discloses an armour-piercing projectile in which increased penetration capability with respect to active armour was created by means of the nose cone of the projectile being given such a design that it is able to mechanically penetrate the reactive armour before the shaped charge is initiated. This means that the penetration jet of the shaped charge can pass unimpeded by the reactive armour, and in this way full pene-tration capability in the main target is achieved.
  • the front part or cap of the nose cone of the projectile has a reinforced tip for mechanical penetration of the reactive armour, and the impact contact member is positioned in the nose cone in such a way that contact is obtained only when the reinforced tip has passed the reactive armour without the latter detonating.
  • the cap has a rearward narrowing wall thickness.
  • the tip of the nose cone is solid and more pointed than in conventional armour-piercing projectiles, and the impact contact member is not brought right to the tip of the projectile. This provides for the delay which is required for the projectile to be able to penetrate the reactive armour before the shaped charge is initiated.
  • Armour-piercing projectiles of the abovementioned type generally afford a very good function both in the case of typical inclined impact angles and in the case of right-angle impacts. However, with certain types of targets, the contact function may be impaired or completely fail even in these armour-piercing projectiles.
  • the aim of the present invention is therefore to provide an armour-piercing projectile which retains a good and reliable contact function even against relatively soft targets, for example targets in which the main armour of the target is relatively thin-walled, such that it is unable to stop the tip of the projectile from penetrating through the armour plate.
  • the invention is characterized in that the casing of the nose cone has a weak point where the casing is designed to be deformed and make electrical contact with the contact member upon impact of the projectile against a target, and that the inner shell in association with the said thin-walled section has a bulge for the purpose of reduced contact distance between the two shells in the said section.
  • a sealing ring is inserted between the outer casing and the inner shell of the contact member at the rear part of the nose cone. This prevents shavings and other undesired particles from coming in between the two shells, the outer casing and inner shell, in the impact contact member and, particularly in the areas with a small contact distance, from causing unintentional contact between the shells.
  • Figure 1 shows a first variant of the invention with a solid, pointed tip
  • Figure 2 shows a second variant with a solid, truncated tip.
  • Figure 1 shows the front part of an armour-piercing projectile provided with a nose cone 1 with a reinforced tip 2.
  • the nose cone is screwed onto the projectile body 3 by means of a thread cutting 4.
  • the nose cone can comprise two parts, a rear part which is screwed onto the projectile body, and a front tip hood.
  • the tip is optimized so as to be able to pass the reactive armour without the latter detonating.
  • the tip is thus solid and has a markedly small tip radius, and its material thickness in the longitudinal direction amounts to at least 4 to 5 times the wall thickness of the rear part of the nose cone.
  • the tip 2' of the projectile which is shown in Figure 2 is also solid, but is truncated compared to the pointed tip which is shown in Figure 1.
  • a truncated tip can increase the penetration capability of the projectile, since the tip is not deflected as easily against an inclined target surface. In other respects the two nose cones do not differ.
  • the nose cone also comprises an impact contact member in the form of a full-calibre double shell, a shell incorporated in the outer casing of the projectile and an inner shell 5.
  • the outer and inner shells of the unused projectile are arranged at a distance and are insulated from each other in such a way that, upon impact of the projectile against a target, they can come into cooperation and make electrical contact with each other.
  • the shells form a passive make contact in the projectile's ignition system for triggering the shaped charge.
  • the nose cone comprises a rear, large space 6 in which the contact member is accommodated, and a front, shorter space 7 with increased material thickness in the walls.
  • the transition between the relatively thin-walled rear part 6 of the nose cone and the front part 7 is designed as an internal shoulder 8 with an annular surface 9 situated in a plane at right angles to the longitudinal axis 10 of the projectile.
  • the front cylindrical part 11 of the contact member is situated immediately behind the shoulder 8 and is insulated from this, and yet is designed in such a way that, upon impact of the projectile against a target, it can come into cooperation with the annular surface and make electrical contact with the outer shell.
  • the outer casing of the nose cone has a weak point or breakpoint in the form of a thin-walled section 12.
  • the inner shell 5 has a bulge 13 for reducing the contact distance between the outer casing and the inner shell in this area.
  • the thin-walled section 12 Upon impact of the projectile against a relatively "soft" target of the type in which the tip of the projectile penetrates part of the target, the thin-walled section 12 is deformed as a result of the compressive load, "squeezing", to which the nose area is subjected during penetration. In this way the outer shell comes into cooperation with the inner shell 5 of the contact member and provides the necessary contact function for triggering of the shaped charge part.
  • the thin-walled section 12 is deformed and contact is achieved in connection with the nose cone being broken or cracked in the weakened area.
  • the contact function As has been mentioned above, it has previously been possible for the contact function to fail in the case of certain types of targets.
  • a breakpoint is defined in which a deformation occurs and provides the desired contact function even in such "hard” target types.
  • a normal contact function is achieved between the internal shoulder and the inner shell as previously.
  • the thin-walled section 12 is formed by an inner, annular recess in the outer casing.
  • the wall thickness is not quite half of the wall thickness elsewhere.
  • the section is situated approximately in the centre of the nose cone in the longitudinal direction and extends in the longitudinal direction to permit a bulge 13 on the inner contact cone.
  • a sealing ring 14 is inserted between the outer shell and the inner shell 5 at the rear part of the nose cone.
  • Such particles can be, for example, metal shavings which can be worn loose from the thread 4 when the nose cone is screwed onto the projectile body. Such shavings could come loose and swirl around between the shells and bring about contact in those areas of the contact member where the contact distance is small.
  • the sealing ring 14 is therefore situated at the rear part of the nose cone in an area where the contact distance is greater.
  • the sealing ring is made of an electrically non-conducting material, preferably compressible and insensitive to humidity, for example material marketed under the name Fagerdala PC 225. This material is very light and compressible and can be pressed in between the shells and sits secured in this position.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electric Cable Installation (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Telephone Function (AREA)

Claims (3)

  1. Projectile de perçage de blindage, comprenant un cône (1) de nez ayant un bout renforcé (2) destiné à pénétrer mécaniquement dans un blindage réactif et un organe (5) de contact à l'impact, placé dans le cône de nez et destiné à déclencher la partie de manoeuvre du projectile lors de l'impact sur une cible, l'organe de contact à l'impact étant formé d'une enveloppe double de calibre nominal telle que la douille du projectile constitue une enveloppe externe et l'enveloppe interne est constituée d'un cône séparé de contact (5), caractérisé en ce que la douille du cône de nez a un point de faiblesse sous forme d'un tronçon (12) à paroi mince, ce tronçon étant destiné à être déformé et à assurer un contact électrique avec le cône de contact (5) lorsque le projectile vient frapper une cible, et en ce que l'enveloppe interne, en association avec le tronçon (12) à paroi mince, possède une partie bombée (13) destinée à réduire la distance de contact entre les deux enveloppes dans ledit tronçon.
  2. Projectile selon la revendication 1, caractérisé en ce qu'une bague d'étanchéité (14) est placée entre la douille du projectile et l'enveloppe interne (5) de l'organe de contact à la partie arrière du cône de nez afin qu'elle empêche les particules sous forme de copeaux ou analogues de passer entre les deux enveloppes et de provoquer un contact intempestif.
  3. Projectile selon la revendication 2, caractérisé en ce que la bague (14) d'étanchéité est formée d'un matériau compressible léger si bien que la bague peut être comprimée entre les deux enveloppes de contact et est logée fermement dans cette position.
EP90850130A 1989-04-06 1990-04-04 Projectile perforant Expired - Lifetime EP0391876B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8901204 1989-04-06
SE8901204A SE468529B (sv) 1989-04-06 1989-04-06 Pansarspraenggranat

Publications (3)

Publication Number Publication Date
EP0391876A2 EP0391876A2 (fr) 1990-10-10
EP0391876A3 EP0391876A3 (fr) 1992-02-26
EP0391876B1 true EP0391876B1 (fr) 1996-06-05

Family

ID=20375567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90850130A Expired - Lifetime EP0391876B1 (fr) 1989-04-06 1990-04-04 Projectile perforant

Country Status (6)

Country Link
EP (1) EP0391876B1 (fr)
AT (1) ATE139026T1 (fr)
DE (1) DE69027251D1 (fr)
ES (1) ES2089006T3 (fr)
GR (1) GR3020857T3 (fr)
SE (1) SE468529B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2718842B1 (fr) * 1994-04-15 1996-06-28 Luchaire Defense Sa Projectile destiné à agresser des cibles dures.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI41630C (fi) * 1964-04-07 1969-12-10 Bofors Ab Kranaatti, jolla on suunnattu räjähdysvaikutus
FR2157152A5 (en) * 1971-10-20 1973-06-01 Serat Nose cone contactor for projectiles - with high degree of sensitivity
SE446483B (sv) * 1985-01-31 1986-09-15 Bofors Ab Pansarsprenggranat, innefattande en rsv-laddning, med forsterkt spets for mekanisk penetration av aktivt pansar
SE457187B (sv) * 1987-04-03 1988-12-05 Bofors Ab Pansarspraenggranat

Also Published As

Publication number Publication date
SE8901204L (sv) 1990-10-07
SE468529B (sv) 1993-02-01
ES2089006T3 (es) 1996-10-01
ATE139026T1 (de) 1996-06-15
EP0391876A2 (fr) 1990-10-10
DE69027251D1 (de) 1996-07-11
EP0391876A3 (fr) 1992-02-26
GR3020857T3 (en) 1996-11-30
SE8901204D0 (sv) 1989-04-06

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