EP2072946B1 - Boîtier amélioré de charge militaire - Google Patents

Boîtier amélioré de charge militaire Download PDF

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Publication number
EP2072946B1
EP2072946B1 EP07123506A EP07123506A EP2072946B1 EP 2072946 B1 EP2072946 B1 EP 2072946B1 EP 07123506 A EP07123506 A EP 07123506A EP 07123506 A EP07123506 A EP 07123506A EP 2072946 B1 EP2072946 B1 EP 2072946B1
Authority
EP
European Patent Office
Prior art keywords
casing
warhead
powder
aluminium
laser sintered
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.)
Active
Application number
EP07123506A
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German (de)
English (en)
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EP2072946A1 (fr
Inventor
Hans-Göran Ohlsson
Geron Karlsson
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 AB
Original Assignee
Saab AB
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=39402580&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2072946(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Saab AB filed Critical Saab AB
Priority to DE602007013788T priority Critical patent/DE602007013788D1/de
Priority to ES07123506T priority patent/ES2361052T3/es
Priority to AT07123506T priority patent/ATE504797T1/de
Priority to EP07123506A priority patent/EP2072946B1/fr
Priority to US12/338,178 priority patent/US20090151591A1/en
Publication of EP2072946A1 publication Critical patent/EP2072946A1/fr
Application granted granted Critical
Publication of EP2072946B1 publication Critical patent/EP2072946B1/fr
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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
    • F42B12/72—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

Definitions

  • the present invention relates to a casing for a warhead or a warhead module.
  • Warheads used for various weapons systems typically comprise warhead casings manufactured from aluminium or steel. These materials are chosen for the casings since they need to be strong and have sufficiently low weight. However, such warheads have the disadvantage that they are likely to cause collateral damage, due to splinter from the warhead casing.
  • US 2005/0235862 A1 describes warhead structures fabricated by using high energy density technology.
  • the warhead structures are made of metals.
  • a warhead casing having the features of independent claim 1 is provided.
  • a laser sintered warhead casing presents several advantages over the casings previously available. It is splinter proof, whereby collateral damage can be avoided, and it can be made in one piece as opposed to steel or aluminium metal casings which have to be manufactured in separate components which are finally assembled. Moreover, laser sintering of the warhead casing allows for more complex geometries than have previously been possible to obtain for warheads in a simple way.
  • the laser sintered material has a density that is sufficiently low, for use in a warhead casing, and the weight is lower than the weight of aluminium alloys, which have a density of 2,7-2,8 g/cm 3 .
  • Figures 1-3 illustrate examples of different geometries for warhead casings.
  • casings for warheads or warhead modules by selective laser sintering technique, a decrease in the weight of such components can be achieved, since laser sintered materials have lower density than solid materials.
  • Warhead casings are-typically rotationally symmetrical. However, due to the flexibility of laser sintering other geometries may be contemplated, so that the warhead casing may be unsymmetrical.
  • the warhead casing has the form of a hollow container, which is typically provided with an opening for filling of explosive.
  • the hollow container comprises one or more wall surface portions, which constitute the container wall.
  • the wall surface portions may be flat or curved.
  • the filling opening may be a cylindrical portion protruding from one of the wall surfaces.
  • the warhead casing may have an unsymmetrical geometry, defining a hollow body, having a flat upper wall and a somewhat curved lower wall opposite the upper wall, a rear flat wall and a front flat wall.
  • the height of the hollow body is larger at the rear end, than at the front end.
  • An opening for filling with explosives is arranged in the flat upper surface, close to the rear wall.
  • FIGS 1-3 illustrate examples of different geometries for warhead casings.
  • the warhead casing of Fig. 1 has an opening 1 for filling of explosive 2, arranged in a flat upper wall 3, from which three flat wall surfaces 4a, 4b, 4c extend sloping slightly downwards. All these three flat wall surfaces are connected to a rounded wall surface 5 which constitutes the wall opposite the filling opening.
  • an indentation 6 In one of the flat surfaces 4b and partly in the rounded wall surface is provided an indentation 6.
  • Fig. 2 illustrates a geometry in which the filling opening 7 extends from a circular surface 8, from which a rounded surface 9 extends downwardly in the form of a truncated cone. At the lower end of the lower wide end of the conical surface flat surfaces 10 extend. Three indentations 11 are provided in these flat surfaces. The bottom surface 12 opposite to the filling opening is flat.
  • the geometry illustrated in Fig. 3 has the form of an elongated container having the filling opening (not shown) arranged in a side wall at the end of a truncated cone.
  • the longitudinal cross-sectional area at the centre of the container (the cross-section of which is shown in Fig. 3 ) is larger than the cross-sectional area at each side of the container.
  • Indentations 13 are provided in the central portion of the container wall surface.
  • Laser sintering has hitherto primarily been used for manufacturing of prototypes for this application.
  • the strength of laser sintered material is not sufficient without reinforcement for extremely high launch forces, but good enough for moderate launch forces.
  • Laser sintering allows for shaping of_complex geometries in one piece, and normally no further machining is required, except possibly clearing of screw threads.
  • An example of the laser sintering technology is described in EP0734842A1 .
  • Laser sintering technology utilizes a model of the object to be manufactured, such as a CAD model.
  • a laser beam is moved layer by layer over a powder bed of fine particles in accordance with the model.
  • the laser beam locally heats the powder to the melting point, without the temperature exceeding the melting point, and the powder grains are thereby sintered together.
  • An article having the same geometry as the model is thus built up layer by layer.
  • On cooling the finished model is broken out of the "cake" of unsintered powder and brushed clean.
  • Selective laser sintering allows generating complex three dimensional objects by consolidating successive layers of powder material on top of each other.
  • the powder blend for manufacture of the warhead casing of the present invention comprises metal particles and particles of a binding component.
  • the powder blend may comprise fine grained aluminium powder and polymer powder.
  • the preferred average grain size of the aluminium powder is 10-90 ⁇ m, more preferably 30-70 ⁇ m, and most preferably 45-55 ⁇ m.
  • the polymer used is preferably a polyamide, such as nylon-powder, which may have a particle diameter of 0,05-0,2 mm.
  • the polyamide improves the binding of the particles to each other.
  • An example of a laser sintered material suitable for warhead casings or warhead modules is Alumide ® , available from EOS Gmbh, Germany.
  • Alumide ® is made up of 50% fine aluminium powder suspended in polyamide (Nylon 12).
  • PCTFE polychlorotrifluoroethylene
  • An alternative to aluminium powder in the laser sintered material may be magnesium powder.
  • the surfaces of the laser sintered parts can be finished by grinding, polishing, or coating.
  • An additional advantage is that low tool-wear machining is possible, e.g. milling, drilling, or tuning.
  • the laser sintered warhead casing is filled with a desired explosive composition.
  • the explosive composition preferably includes aluminium powder. Aluminium plays an important role in both the shock response and energy release rates of energetic materials.
  • the aluminium powder of the explosive composition When the explosive composition detonates, the aluminium powder of the explosive composition is dispersed and rapidly burns. At the same time the casing is disintegrated. As the warhead casing is made up of laser sintered aluminium and/or magnesium, the metal grains that the casing was made up of will participate in the explosive reaction and will thus contribute to the effect obtained.
  • the explosive composition used in the in the warhead may include aluminium powder in an amount of 15-50 % by weight of the total composition, which reacts with the air oxygen. Too high aluminium powder content doesn't serve any purpose, since the air oxygen available for reaction is limited. An aluminium powder content of approximately 19-21 % by weight, results in an explosive composition that is easy to handle and easy to fill in the warhead casing.
  • the aluminium powder typically has an average particle size between 12 and 18 ⁇ m.
  • the explosive composition may be based on a nitroamine explosive, such as RDX (hexogen or cyclotrimethylene-trinitramine) or HMX (octogen or cyclotetramethylene-tetranitramine), and may in addition to aluminium powder also comprise a binder.
  • a nitroamine explosive such as RDX (hexogen or cyclotrimethylene-trinitramine) or HMX (octogen or cyclotetramethylene-tetranitramine)
  • the amount of nitroamine explosive e.g. RDX
  • the binder may be present in approximately 15% by weight.
  • the binder may comprise a binder agent (e.g. HTPB (hydroxyl-terminated polybutadiene)), plasticizer (e.g. DOA (dioctyl adipate)), surfactant (e.g. DHE (N,N-di-(2-hydroxyethyl)-4,4-dimethylhydantoin)), cure catalyst (e.g. triphenylbismuth) and curing agent (e.g. IDPI (isophorone diisocyanate)).
  • a binder agent e.g. HTPB (hydroxyl-terminated polybutadiene)
  • plasticizer e.g. DOA (dioctyl adipate)
  • surfactant e.g. DHE (N,N-di-(2-hydroxyethyl)-4,4-dimethylhydantoin
  • cure catalyst e.g. triphenylbismuth
  • curing agent e.g. IDPI (iso
  • the lacquer coating must be compatible with the explosive, to avoid undesired reactions.
  • the lacquer may for example be an epoxy resin lacquer, such as RenLam ® , comprising resin and curing agent (e.g. RenLam LY 113/HY 97).
  • the laser sintered casing may also be reinforced by an outer lining of reinforced fibre type, e.g. carbon or Kevlar, to be able to withstand large launching forces.
  • reinforced fibre type e.g. carbon or Kevlar
  • the warhead casing thus manufactured will be splinter free, unless it is not provided with an additional metal casing.
  • the aluminium powder of the explosive composition will ignite and burn.
  • test warhead casing was manufactured by laser sintering of Alumide ® .
  • the test warhead was a cylindrical, hollow body with a material thickness of 4mm and a weight of 375 g, which was filled with 2 kg explosive composition PBXN-109.
  • the warhead was lacquered with RenLam ® .
  • test warhead casing was subjected to low temperature and high temperature tests.
  • the test warhead casing was placed in Weiss 1 climate chamber. Under a first period of time, the temperature in the climate chamber was changed from an initial temperature to a goal temperature. Under a second period of time the temperature in the climate chamber was maintained at the goal temperature, and under a third period of time the temperature in the climate chamber was changed from the-goal temperature to en end temperature.
  • test warhead was examined for damages, by means of ocular inspection. No damages could be observed.
  • the test warhead was also subjected to a vibration test (STANAG 4242/APO-34).
  • the warhead was mounted on a fixture of a test equipment (vibrator system LDS 954, amplifier MPA 32, control system DACTRON Dual DSP) and was subjected to vibrations for two hours in each of three directions (x-, y-, and z-directions) in a temperature of approx. 20°C.
  • the measuring equipment used was an accelerometer KISTLER ICP. Thereafter, the test casing was examined for damages. No damages could be observed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Powder Metallurgy (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
  • Circuits Of Receivers In General (AREA)

Claims (8)

  1. Carter destiné à des composants d'ogive, caractérisé en ce que le carter est réalisé dans un matériau subissant un frittage laser, où le matériau subissant un frittage laser comprend des particules polymères et de la poudre d'aluminium ou de magnésium.
  2. Carter selon la revendication 1, où ladite poudre d'aluminium présente une granulométrie moyenne de 10-90, de préférence de 45-55 µm.
  3. Carter selon la revendication 1, où les particules polymères contiennent un polyamide.
  4. Carter selon de la revendication 1, où les particules polymères contiennent un polychlorotrifluoroéthylène.
  5. Carter selon l'une quelconque des revendications 1 à 4, où le carter comporte un revêtement de vernis.
  6. Carter selon l'une quelconque des revendications 1 à 5, où le carter comporte un revêtement extérieur de kevlar, par exemple.
  7. Ogive comprenant un carter tel que défini dans les revendications 1-6.
  8. Ogive selon la revendication 7, où le carter est rempli d'un produit composé explosif (2) à liaison polymère et qui comprend un liant et de la poudre d'aluminium.
EP07123506A 2007-12-18 2007-12-18 Boîtier amélioré de charge militaire Active EP2072946B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DE602007013788T DE602007013788D1 (de) 2007-12-18 2007-12-18 Verbessertes Gehäuse für einen Gefechtskopf
ES07123506T ES2361052T3 (es) 2007-12-18 2007-12-18 Carcasa para carga militar.
AT07123506T ATE504797T1 (de) 2007-12-18 2007-12-18 Verbessertes gehäuse für einen gefechtskopf
EP07123506A EP2072946B1 (fr) 2007-12-18 2007-12-18 Boîtier amélioré de charge militaire
US12/338,178 US20090151591A1 (en) 2007-12-18 2008-12-18 Warhead casing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07123506A EP2072946B1 (fr) 2007-12-18 2007-12-18 Boîtier amélioré de charge militaire

Publications (2)

Publication Number Publication Date
EP2072946A1 EP2072946A1 (fr) 2009-06-24
EP2072946B1 true EP2072946B1 (fr) 2011-04-06

Family

ID=39402580

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07123506A Active EP2072946B1 (fr) 2007-12-18 2007-12-18 Boîtier amélioré de charge militaire

Country Status (5)

Country Link
US (1) US20090151591A1 (fr)
EP (1) EP2072946B1 (fr)
AT (1) ATE504797T1 (fr)
DE (1) DE602007013788D1 (fr)
ES (1) ES2361052T3 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0815936D0 (en) * 2008-08-29 2009-01-14 Bae Systems Plc Cast Explosive Composition
US8114230B1 (en) 2010-10-08 2012-02-14 The United States Of America As Represented By The Secretary Of The Navy Composition 4 (C-4) simulants
US20140039662A1 (en) 2012-07-31 2014-02-06 Makerbot Industries, Llc Augmented three-dimensional printing
FR3000192B1 (fr) * 2012-12-21 2017-07-14 Tda Armements Sas Charge militaire a eclats et procede de fabrication
FR3000191B1 (fr) * 2012-12-21 2017-08-11 Tda Armements Sas Charge militaire a eclats et procede de fabrication
GB2526262B (en) * 2014-05-02 2021-04-28 Mbda Uk Ltd Composite reactive material for use in a munition
CN112390693B (zh) * 2020-11-03 2021-11-23 西安近代化学研究所 一种基于激光同轴度测量仪提高装填比的战斗部壳体

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Also Published As

Publication number Publication date
ES2361052T3 (es) 2011-06-13
US20090151591A1 (en) 2009-06-18
ATE504797T1 (de) 2011-04-15
EP2072946A1 (fr) 2009-06-24
DE602007013788D1 (de) 2011-05-19

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