EP3977042A1 - Améliorations apportés ou associés à des charges explosives - Google Patents

Améliorations apportés ou associés à des charges explosives

Info

Publication number
EP3977042A1
EP3977042A1 EP20723779.3A EP20723779A EP3977042A1 EP 3977042 A1 EP3977042 A1 EP 3977042A1 EP 20723779 A EP20723779 A EP 20723779A EP 3977042 A1 EP3977042 A1 EP 3977042A1
Authority
EP
European Patent Office
Prior art keywords
liner
explosive
metal
degrees
shaped charge
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.)
Granted
Application number
EP20723779.3A
Other languages
German (de)
English (en)
Other versions
EP3977042B1 (fr
EP3977042C0 (fr
Inventor
Roland Alford
Sidney ALFORD.
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.)
Alford IP Ltd
Original Assignee
Alford IP Ltd
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 Alford IP Ltd filed Critical Alford IP Ltd
Publication of EP3977042A1 publication Critical patent/EP3977042A1/fr
Application granted granted Critical
Publication of EP3977042B1 publication Critical patent/EP3977042B1/fr
Publication of EP3977042C0 publication Critical patent/EP3977042C0/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • 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
    • F42B12/04—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type
    • F42B12/10—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of armour-piercing type with shaped or hollow charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/028—Shaped or hollow charges characterised by the form of the liner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/032—Shaped or hollow charges characterised by the material of the liner
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/036—Manufacturing processes therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
    • F42B33/06—Dismantling fuzes, cartridges, projectiles, missiles, rockets or bombs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
    • F42B33/06—Dismantling fuzes, cartridges, projectiles, missiles, rockets or bombs
    • F42B33/062—Dismantling fuzes, cartridges, projectiles, missiles, rockets or bombs by high-pressure water jet means

Definitions

  • the present invention relates generally to explosive charges and particularly, but not exclusively, to shaped charges.
  • a typical shaped charge has a concave metal hemisphere or cone (known as a liner) backed by a high explosive, all in a casing.
  • a liner concave metal hemisphere or cone
  • a detonation wave is generated; this causes the metal liner to be compressed and squeezed forward, forming a high velocity metallic jet.
  • the present invention seeks to provide improvements in or relating to shaped charges.
  • An aspect of the present invention provides a liner for a shaped charge, the liner being a generally conical liner, in which the liner is formed from metal or metal alloy and in which the liner has an internal apex angle in the range of approximately 105- 1 10 degrees.
  • the angle may be in the range of approximately 107- 109 degrees.
  • the angle may be approximately 108 degrees.
  • a further aspect provides a liner for a shaped charge, the liner being, in which the liner is formed from metal or metal alloy and in which the liner is formed as a section of a hemisphere.
  • the liner may be formed from a low-density metal or alloy that is capable of burning.
  • the liner is formed from magnesium, copper or aluminium or alloys thereof.
  • Examples of embodiments include: a copper jet forming cone; a copper explosively formed projectile; and a magnesium jet forming cone. Additional thickness could, for example, be used to maintain roughly the same mass for a lower density metal.
  • a further aspect provides an explosive ordnance neutralisation system comprising a low-order explosive shaped charge having a liner, the liner being a die-cast, jet-forming cone having a cone angle of approximately 1 08 degrees.
  • a further aspect provides an explosive ordnance neutralisation system comprising a low-order explosive shaped charge having an EFP-forming liner, the liner having a cone angle of approximately 1 08 degrees.
  • Systems formed in accordance with the present invention may operate in such a way to produce a non-explosive reaction that does not cause a detonation, known as a low order event.
  • the liner is systems formed in accordance with the present invention may be formed from magnesium or a magnesium alloy.
  • a liner for a shaped charge the liner being a generally conical metal liner, in which the liner is formed from magnesium and in which the liner has an internal apex angle in the range of approximately 105- 1 10 degrees.
  • the angle may be in the range of approximately 105- 1 10 degrees, for example 107- 109 degrees; such as approximately 108 degrees.
  • the metal liner is formed by die casting. This helps to avoid porosity (which can prevent jet formation). In other embodiments the metal liner may be formed by hot-stamping from metal sheet.
  • the material of the liner has a generally uniform thickness.
  • the present invention also provides a shaped charge fittable with, fitted with, or having a liner as described herein.
  • the present invention also provides an explosive ordnance neutralisation system comprising an explosive shaped charge designed to produce a low-order event in a target munition having a liner, the liner being a die-cast magnesium jet-forming cone having a cone angle of 108 degrees.
  • Explosives can be categorised by their speed of detonation: low explosives which burn violently or high explosives which detonate. The speed of deflagration or detonation are a measure of the power and destructive force of an explosive. High explosives detonate, producing a shockwave travelling through the explosive material at supersonic speed (typically from 1 ,800 to 8,000 m/s).
  • a“low-order” event When attempting to neutralise a munition in the process of explosive ordnance disposal detonating the munition is not ideal because the damage caused to the surroundings can be significant. It is possible to cause munitions to deflagrate or burn rather than detonate in a process commonly referred to as a“low-order” event. Unlike low explosives such as black powder which can only deflagrate, specific conditions must be maintained in order to cause a high explosive to violently enough to rapidly destroy a munition and consume a significant proportion of the explosive without it undergoing a transition to detonation. Such a low-order event may be preferable in some situations.
  • Shaped charges may be used to cause explosive in a munition to react, and the type of reaction depends largely on the size, shape and material of the charge. If too much energy is imparted into the munition, it may shock to detonation. Conversely, imparting too little energy may cause the reaction of not sustain itself and self- extinguish.
  • the target explosive shall ignite and with suitable confinement from the munition’s outer casing, the pressure within the case shall increase, accelerating the speed of deflagration, causing further pressure increases until the munition’s case is unable to retain the high internal pressure and bursts. The munition is opened up, the explosive either burned or scattered and the entire device rendered safe.
  • This invention relates to a shaped charge projectile design that produces the ideal conditions for producing a low-order event by using a low-density metallic material capable of burning.
  • the shape of the projectile is such that it is in the transition phase between a traditional conical shaped charge capable of deep penetration and an explosively formed projectile (EFP) capable of travelling great distances.
  • EFP explosively formed projectile
  • it lacks the deep penetrative power of a more conventional shaped charge, typically made from copper having a cone angle between 70 and 45 degrees but has greater penetration than a comparably sized EFP which would form a larger diameter entry hole.
  • the charge 10 comprises a generally cylindrical bottle-like container 15.
  • the container includes a generally cylindrical body 16. At one end of the body an inclined wall 17 extends radially inwards. At the centre of the wall 17 a neck 18 is provided and has a central passage 19. In this embodiment a separate screw threaded collar 20 is provided for receiving a detonator and can be screwed onto the neck 18.
  • the other end of the body 16 is closed by a partition/barrier/barrier membrane 25.
  • the membrane 25 has an annular flange 26 that fits onto the open end of the body.
  • a short annular skirt 27 depends from the flange. The skirt 27 is positioned to fit into the interior of the body.
  • a longitudinal annular leg 29 extends and is closed by a concave plate 30 (so the plate 30 is“inside” the body).
  • the interior of the body provides an enclosure 32 for receiving liquid explosive, such as nitromethane.
  • a projectile in the form of a die-cast magnesium metal cone 37 having a cone angle of 108 degrees is provided.
  • the shape/profile of the cone 37 is complimentary with the shape of the plate/leg.
  • the charge diameter is greater than the projectile diameter.
  • the container could be formed from a plastics material.
  • This embodiment includes a plastic surface between the explosive and the liner which facilitates containing a liquid without leaking, while not adversely affecting the performance of the cone.
  • This embodiment uses liquid explosives.
  • Other embodiments use a more conventional shaped charge (factory or user-filled) which uses plastic explosive or a cast explosive.
  • the charge I 10 is shown assembled in Figure 6.
  • the body I 16 can be filled with liquid explosive and the collar 120 is screwed onto the body 1 16.
  • a detonator 140 is fitted into the collar and a projectile 1 37 is fitted into the membrane 125.
  • activation of the detonator 140 causes detonation of the liquid explosive material, which in turn causes projection of the projectile 1 37.
  • This embodiment provides the feature that there is a plastic surface between the explosive and the liner which facilitates containing a liquid without leaking while not adversely affecting the performance of the cone.
  • FIGS. 7 to I I are sections showing two sizes and three projectiles for comparison: Copper jet forming cone, Copper explosively formed projectile and Magnesium 108 degree Magnesium jet forming cone. Additional thickness can be used to maintain roughly the same mass for a lower density metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Toys (AREA)

Abstract

L'invention concerne un revêtement pour une charge façonnée, le revêtement étant un revêtement généralement conique, le revêtement étant formé à partir d'un métal ou d'un alliage métallique et le revêtement ayant un angle de sommet interne dans la plage d'environ 105 à 110 degrés.
EP20723779.3A 2019-05-25 2020-05-07 Charge creuse Active EP3977042B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB1907438.4A GB2582670B8 (en) 2019-05-25 2019-05-25 Improvements in or relating to explosive charges
GB2002939.3A GB2584361B (en) 2019-05-25 2020-03-02 Improvements in or relating to explosive charges
PCT/EP2020/062689 WO2020239383A1 (fr) 2019-05-25 2020-05-07 Améliorations apportés ou associés à des charges explosives

Publications (3)

Publication Number Publication Date
EP3977042A1 true EP3977042A1 (fr) 2022-04-06
EP3977042B1 EP3977042B1 (fr) 2024-10-16
EP3977042C0 EP3977042C0 (fr) 2024-10-16

Family

ID=67385411

Family Applications (3)

Application Number Title Priority Date Filing Date
EP25189750.0A Pending EP4624862A3 (fr) 2019-05-25 2020-04-09 Améliorations apportées ou se rapportant à des charges explosives
EP20168891.8A Active EP3745078B1 (fr) 2019-05-25 2020-04-09 Améliorations apportées ou se rapportant à des charges explosives
EP20723779.3A Active EP3977042B1 (fr) 2019-05-25 2020-05-07 Charge creuse

Family Applications Before (2)

Application Number Title Priority Date Filing Date
EP25189750.0A Pending EP4624862A3 (fr) 2019-05-25 2020-04-09 Améliorations apportées ou se rapportant à des charges explosives
EP20168891.8A Active EP3745078B1 (fr) 2019-05-25 2020-04-09 Améliorations apportées ou se rapportant à des charges explosives

Country Status (4)

Country Link
US (1) US20220325991A1 (fr)
EP (3) EP4624862A3 (fr)
GB (2) GB2582670B8 (fr)
WO (1) WO2020239383A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB202017072D0 (en) * 2020-10-27 2020-12-09 Uxo Control B V Unexploded ordinance disposal method and system
CN116625175B (zh) * 2023-07-25 2023-09-19 吉林市双林射孔器材有限责任公司 一种大孔径增压射孔弹
GB202405504D0 (en) * 2024-04-19 2024-06-05 Alford Ip Ltd Improvements in or relating to explosive charges

Family Cites Families (31)

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BE471713A (fr) * 1946-03-09
US2974595A (en) * 1947-09-11 1961-03-14 Welex Inc Projectile
DE1946991C3 (de) * 1969-09-17 1978-05-24 Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen Hohlladung
GB1475754A (en) * 1974-10-21 1977-06-10 Ici Ltd Shaped charge device
GB1520692A (en) * 1976-03-01 1978-08-09 Ici Ltd Shaped explosive charge casing
GB1556859A (en) * 1976-11-29 1979-11-28 Ici Ltd Shaped explosive charge device for underwater use
FR2429990B1 (fr) * 1978-06-27 1985-11-15 Saint Louis Inst Charge explosive plate
GB2105015B (en) * 1981-07-17 1985-08-21 Alford Sidney C Directed explosive cutting charge and method
DE8132666U1 (de) * 1981-11-07 1984-01-31 Rheinmetall GmbH, 4000 Düsseldorf Einlage für eine Sprengladung zum Bilden eines im wesentlichen stabförmigen Projektils
US4714022A (en) * 1984-09-05 1987-12-22 Etat Francais Warhead with tandem shaped charges
DE3506225A1 (de) * 1985-02-22 1986-08-28 Diehl GmbH & Co, 8500 Nürnberg Gefechtskopfanordnung
DE3508740A1 (de) * 1985-03-12 1986-10-16 Karl 8898 Schrobenhausen Rudolf Hohlladung zum einsatz gegen beton- und/oder gesteinsarmierte ziele
US4766813A (en) * 1986-12-29 1988-08-30 Olin Corporation Metal shaped charge liner with isotropic coating
DE3705381A1 (de) * 1987-02-20 1988-09-01 Diehl Gmbh & Co Sprengladung mit einer projektilbildenden metallischen einlage
GB2209819B (en) * 1987-09-15 1991-04-17 Alford Sidney C Shaping apparatus for an explosive charge
AU8138791A (en) * 1990-07-27 1992-01-30 Dyno Wesfarmers Limited Improvements in or relating to shaped charges
US5098487A (en) * 1990-11-28 1992-03-24 Olin Corporation Copper alloys for shaped charge liners
US5155296A (en) * 1992-03-18 1992-10-13 The United States Of America As Represented By The Secretary Of The Army Thermally enhanced warhead
US5522319A (en) * 1994-07-05 1996-06-04 The United States Of America As Represented By The United States Department Of Energy Free form hemispherical shaped charge
FR2741142B1 (fr) * 1995-11-13 1998-01-02 Giat Ind Sa Charge generatrice de noyau ayant une tenue a l'acceleration amelioree
GB0200267D0 (en) * 2002-01-08 2002-02-20 Alford Sidney C Device for the disruption of explosive ordnance
US8375859B2 (en) * 2010-03-24 2013-02-19 Southwest Research Institute Shaped explosive charge
US8434411B2 (en) * 2011-01-19 2013-05-07 Raytheon Company Cluster explosively-formed penetrator warheads
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US9157705B1 (en) * 2013-05-30 2015-10-13 The United States Of America As Represented By The Secretary Of The Army Projector for defeating buried mines
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US10274292B1 (en) * 2015-02-17 2019-04-30 U.S. Department Of Energy Alloys for shaped charge liners method for making alloys for shaped charge liners
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RU2658734C2 (ru) * 2016-07-05 2018-06-22 Виктор Николаевич Лаврентьев Удлинённый кумулятивный заряд
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Also Published As

Publication number Publication date
EP3977042B1 (fr) 2024-10-16
GB201907438D0 (en) 2019-07-10
WO2020239383A1 (fr) 2020-12-03
EP4624862A2 (fr) 2025-10-01
GB202002939D0 (en) 2020-04-15
EP3977042C0 (fr) 2024-10-16
GB2582670B8 (en) 2023-10-25
EP3745078C0 (fr) 2025-10-08
US20220325991A1 (en) 2022-10-13
GB2584361A (en) 2020-12-02
GB2582670A (en) 2020-09-30
EP3745078B1 (fr) 2025-10-08
GB2582670B (en) 2023-07-12
GB2584361B (en) 2023-02-01
EP3745078A1 (fr) 2020-12-02
GB2582670A8 (en) 2023-10-25
EP4624862A3 (fr) 2025-12-03

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