EP0263204B1 - Charge de perforation linéaire - Google Patents

Charge de perforation linéaire Download PDF

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Publication number
EP0263204B1
EP0263204B1 EP86307745A EP86307745A EP0263204B1 EP 0263204 B1 EP0263204 B1 EP 0263204B1 EP 86307745 A EP86307745 A EP 86307745A EP 86307745 A EP86307745 A EP 86307745A EP 0263204 B1 EP0263204 B1 EP 0263204B1
Authority
EP
European Patent Office
Prior art keywords
charge
casing
groove
bar
liner
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
EP86307745A
Other languages
German (de)
English (en)
Other versions
EP0263204A1 (fr
Inventor
David Alan Dr. Dadley
Peter John Dr. Haskins
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.)
BAE Systems PLC
Original Assignee
Royal Ordnance PLC
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 Royal Ordnance PLC filed Critical Royal Ordnance PLC
Priority to EP86307745A priority Critical patent/EP0263204B1/fr
Priority to ES86307745T priority patent/ES2015534B3/es
Priority to AT86307745T priority patent/ATE51958T1/de
Publication of EP0263204A1 publication Critical patent/EP0263204A1/fr
Application granted granted Critical
Publication of EP0263204B1 publication Critical patent/EP0263204B1/fr
Priority to GR90400326T priority patent/GR3001010T3/el
Priority to GR90300049T priority patent/GR900300049T1/el
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
    • 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
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/08—Blasting cartridges, i.e. case and explosive with cavities in the charge, e.g. hollow-charge blasting cartridges
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B3/00—Blasting cartridges, i.e. case and explosive
    • F42B3/28—Cartridge cases characterised by the material used, e.g. coatings

Definitions

  • This invention relates to a hollow charge for linear cutting purposes.
  • Hollow charges comprising a mass of explosive having a variously shaped cavity at one of its surfaces, the cavity being lined with a metal liner. Detonation of the charge violently compresses the metal liner converting it into an outwardly projected slug of metal, the shape of which is dependent upon the shape of the cavity.
  • the slug has powerful penetrating properties which are utilized by detonating the charge with its cavity adjacent and facing a surface to be penetrated, i.e. the work surface. The penetration of the slug is dependent on the separation of the charge from the work surface, i.e. the stand-off distance, the optimum value of which is normally determined by experiment.
  • a hollow charge known for linear cutting purposes comprises an elongated mass of explosive material having a cavity in the form of a V-shaped groove along its length, which mass is encased by a thin walled metal casing. Detonation produces a planar slug along the length of the groove which can be utilized for linear cutting.
  • a lead tube is packed with explosive granules and then passed through a series of rollers arranged to form the packed tube into a bar of chevron cross-section thereby forming a lead- lined, V-shaped groove along the length of the bar.
  • the present invention seeks to provide a linear cutting charge having a construction conducive to accurate and uniform formation of its effective dimensions.
  • a linear cutting charge includes an explosive mass formed in the shape of a bar from a composite of explosive material and a first pliant material, the bar having a groove extending longitudinally along one of its faces, within which groove is located a continuous liner formed from a composite of particulate metal and a second pliant material.
  • both the bar and the liner may be formed by extrusion, but formation may also be by other techniques, e.g. moulding or rolling.
  • the particulate metal may advantageously be copper.
  • the first and second pliant materials are chosen to be chemically compatible with the explosive material and are preferably identical.
  • the groove has an outwardly widening, triangular cross-section and both the bar and the liner may be of chevron cross-section, the liner being bonded to the bar so as to cover the surfaces of the groove.
  • the linear cutting charge further includes a casing which may advantageously be substantially rigid to prevent distortion of the bar and the liner during handling, which casing may advantageously include a spacing portion having an engagement surface for presentation to a work surface, which engagement surface is parallel to the outer edges of the liner and spaced therefrom, thereby to maintain an optimum stand-off distance.
  • the casing may be flexible to facilitate cutting of curved surfaces and curved lines.
  • stiffening means may be advantageously included, which may comprise metallic strips embedded in the casing normal to the engagement surface and extending longitudinally on either side of the groove, whereby the bending of the linear cutting charg e may be limited to lateral bending parallel with the engagement surface.
  • the casing may advantageously include a groove filling portion of low density material to prevent the influx of dense material when, for example, the linear cutting charge is used underwater.
  • the casing including the spacing portion and the groove filling portion may be integrally constructed from a low density flexible material such as expanded polyethylene.
  • the linear cutting charge of Figures 1 and 2 has an explosive bar 1 of chevron cross-section having a groove 2 defined by the intersecting surfaces 3 and 4 which are included one to the other at an angle of 120 degrees.
  • the bar 1 is formed by extrusion from a pliant mixture of 88% by weight of RDX (Cyclotrimethylene- trinitramine), 8.4% PIB (Polyisobutylene), 2.4% DEHS (2(Diethylhexyl) sebacate), and 1.2% PTFE (polytetrafluroethylene).
  • RDX Cyclotrimethylene- trinitramine
  • PIB Polyisobutylene
  • DEHS Diethylhexyl
  • PTFE polytetrafluroethylene
  • the thickness of the bar measured in a direction normal to either of the faces 3 or 4 is 6.35 mm.
  • a flexible casing 6 of expanded polyethylene surrounds the bar 1 except for the groove 2 and includes spacing portions 7 and 8 which protrude beyond the edges 9 of the liner 5 by a distance of 3.8mm which, for this configuration, is the optimum stand-off distance between the edges 9 and an engagement surface 12 presented to a work surface 10.
  • the casing 6 and the bar 1 are bonded together by a compatible adhesive.
  • the explosive bar 1 may conveniently be initiated by an electrically operated detonator (not shown) which may be affixed externally to the casing at one end of the linear cutting charge.
  • FIG. 3 A second embodiment of the invention is illustrated in Figure 3 in which the bar 1 and liner 5 described with reference to Figures 1 and 2 are surrounded entirely by a casing 11 of a low density material such as expanded polyethylene having an engagement surface 12 which is placed in contact with a work surface 13.
  • the casing 11 comprises a first portion 156 which is substantially the same as the casing 6 of Figure 1 and a groove filling portion 17 which is bonded to the first portion 16 at surfaces 18 and 19 by a suitable adhesive.
  • Stiffening means comprising metallic strips 14 and 15 are embedded in the casing 11 on either side of the groove 2 and normal to the engagement surface 12, thereby limiting bending of the linear cutting charge to lateral bending parallel to the plane of the engagement surface 12.
  • the casing may be of a rigid material such as polystyrene, and any casing may or may not include a groove filling portion.
  • a groove filling portion may alternatively comprise a thin walled, air filled compartment, thereby excluding material from the groove and providing minimal resistance to the cutting slug generated by detonation of the charge.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Dry Shavers And Clippers (AREA)
  • Surgical Instruments (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Claims (16)

1. Charge pour coupe linéaire, caractérisée en ce qu'elle comporte une masse explosive mise en forme de barre (1) obtenue à partir d'un composite d'une matière explosive et d'une première matière malléable, la barre ayant une rainure (2) s'étendant longitudinalement le long d'une de ses faces, ladite rainure logeant un chemisage (5) continu, formé à partir d'un composite de métal particulaire et d'une seconde matière malléable.
2. Charge telle que revendiquée à la revendication 1, caractérisée en ce que le métal particulaire est du cuivre.
3. Charge telle que revendiquée aux revendications 1 et 2, caractérisée en ce que la première matière malléable et la seconde matière malléable ont les mêmes constituants.
4. Charge telle que revendiquée à la revendication 3, caractérisée en ce que les constituants sont du PIB (polyisobutylène), du DEHS (sébacate de bis (2-diéthylhexyle)] et du PTFE (polytétrafluor- éthylène).
5. Charge telle que revendiquée dans l'une quelconque des revendications précédentes, caractérisée en ce que la barre (1) et le chemisage (5) sont tous deux formés par extrusion.
6. Charge telle que revendiquée dans l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte en outre une enveloppe (6) ouverte à la rainure et comportant, à la périphérie de la rainure, une surface (12) de contact, qui est présentée ou tournée en service vers une surface à travailler.
7. Charge telle que revendiquée à la revendication 6, caractérisée en ce que l'enveloppe (6) s'étend au-delà de la rainure (2) pour produire une partie (7, 8) à rôle d'entretoise d'espacement, de sorte que la surface de contact est espacée, d'une distance d'écartement prédéterminée, des bords extérieurs du chemisage.
8. Charge telle que revendiquée aux revendications 6 et 7, caractérisée en ce que l'enveloppe (11) comporte une partie (17), formée d'une matière à basse densité, pour l'emplissage de la rainure.
9. Charge telle que revendiquée à la revendication 8, caractérisée en ce que la partie (17) d'emplissage de la rainure et l'enveloppe (11) forment un ensemble monobloc.
10. Charge telle que revendiquée dans l'une quelconque des revendications précédentes, caractérisée en ce que la rainure (2) présente une section transversale triangulaire s'élargissant vers l'extérieur.
11. Charge telle que revendiquée à la revendication 10, caractérisée en ce que la barre (1) et le chemisage (5) ont une section transversale en chevron.
12. Charge telle que revendiquée dans l'une quelconque des revendications 6 à 11, caractérisée en ce que l'enveloppe est essentiellement rigide.
13. Charge telle que revendiquée dans l'une quelconque des revendications 6 à 11, caractérisée en ce que l'enveloppe est flexible.
14. Charge telle que revendiquée à la revendication 13, caractérisée en ce qu'elle comprend un moyen (14, 15) de raidissement, de sorte qu'une flexion de la barre est essentiellement limitée à une flexion latérale parallèlement à la surface de contact.
15. Charge telle que revendiquée à la revendication 14, caractérisée en ce que le moyen de raidissement comprend des bandes métalliques (14, 15) enrobées dans l'enveloppe (11) perpendiculairement à la surface de contact et qui s'étendent longitudinalement de chaque côté de la rainure (2).
16. Charge telle que revendiquée dans l'une quelconque des revendications 13 à 15, caractérisée en ce que l'enveloppe (11) est en polyéthylène expansé.
EP86307745A 1986-10-08 1986-10-08 Charge de perforation linéaire Expired - Lifetime EP0263204B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP86307745A EP0263204B1 (fr) 1986-10-08 1986-10-08 Charge de perforation linéaire
ES86307745T ES2015534B3 (es) 1986-10-08 1986-10-08 Carga de corte lineal
AT86307745T ATE51958T1 (de) 1986-10-08 1986-10-08 Lineare schneidladung.
GR90400326T GR3001010T3 (en) 1986-10-08 1990-05-24 A linear cutting charge
GR90300049T GR900300049T1 (en) 1986-10-08 1991-07-31 A linear cutting charge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86307745A EP0263204B1 (fr) 1986-10-08 1986-10-08 Charge de perforation linéaire

Publications (2)

Publication Number Publication Date
EP0263204A1 EP0263204A1 (fr) 1988-04-13
EP0263204B1 true EP0263204B1 (fr) 1990-04-11

Family

ID=8196171

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86307745A Expired - Lifetime EP0263204B1 (fr) 1986-10-08 1986-10-08 Charge de perforation linéaire

Country Status (4)

Country Link
EP (1) EP0263204B1 (fr)
AT (1) ATE51958T1 (fr)
ES (1) ES2015534B3 (fr)
GR (2) GR3001010T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU169487U1 (ru) * 2016-08-03 2017-03-21 Станислав Иванович Дорошенко Удлиненный заряд взрывчатого вещества

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2476994B (en) * 2010-01-18 2015-02-11 Jet Physics Ltd Linear shaped charge
CN104016818B (zh) * 2014-05-29 2017-04-05 山东大学 一种多功能乳化炸药切割装置及其方法
FR3028853B1 (fr) * 2014-11-21 2016-12-30 Pyroalliance Cordeaux detonants de decoupe et leur preparation
FR3130363B1 (fr) 2021-12-15 2024-03-01 Pyroalliance Ensemble séparable par découpe pyrotechnique

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2605703A (en) * 1944-07-06 1952-08-05 Du Pont Liner for hollow charges
BE471713A (fr) * 1946-03-09
US3136249A (en) * 1961-06-12 1964-06-09 Jet Res Ct Inc Shaped charge explosive unit and liner therefor
US3185089A (en) * 1962-06-28 1965-05-25 Thiokol Chemical Corp Flexible linear shaped charge for underwater use
FR2333764A1 (fr) * 1975-12-05 1977-07-01 Poudres & Explosifs Ste Nale Procede de fabrication de cordeaux detonants de decoupage et de charges diedriques ou creuses ameliores et dispositifs ainsi obtenus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU169487U1 (ru) * 2016-08-03 2017-03-21 Станислав Иванович Дорошенко Удлиненный заряд взрывчатого вещества

Also Published As

Publication number Publication date
ES2015534B3 (es) 1990-09-01
EP0263204A1 (fr) 1988-04-13
ATE51958T1 (de) 1990-04-15
GR3001010T3 (en) 1991-12-30
GR900300049T1 (en) 1991-07-31

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