EP2075525B1 - Pyrotechnical cutter fuse and method of manufacturing such a fuse - Google Patents

Pyrotechnical cutter fuse and method of manufacturing such a fuse Download PDF

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Publication number
EP2075525B1
EP2075525B1 EP08291238A EP08291238A EP2075525B1 EP 2075525 B1 EP2075525 B1 EP 2075525B1 EP 08291238 A EP08291238 A EP 08291238A EP 08291238 A EP08291238 A EP 08291238A EP 2075525 B1 EP2075525 B1 EP 2075525B1
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EP
European Patent Office
Prior art keywords
envelope
cord
cutting
casing
explosive
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EP08291238A
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German (de)
French (fr)
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EP2075525A1 (en
Inventor
Gérard Tanguy
Nicolas Eches
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Nexter Munitions SA
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Nexter Munitions SA
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Publication of EP2075525A1 publication Critical patent/EP2075525A1/en
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
    • C06C5/00—Fuses, e.g. fuse cords
    • C06C5/04—Detonating fuses
    • 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

Definitions

  • the technical field of the invention is that of pyrotechnic cutting cords.
  • These cutting cords are well known. They usually comprise an explosive material which is arranged in a housing and against which is applied a metal profile forming a cutting coating.
  • the housing and the coating are usually elongated, straight or curved.
  • the cord is applied against the wall to be cut.
  • the initiation of the explosive causes the projection of the coating at high speed according to the conventional principle of operation of the formed charges. Due to the elongated shape of the cord, this projection causes a cut along the line followed by the cord.
  • the patent US-4297946 A thus describes a cutting line of known type.
  • a cord is usually obtained by stretching an explosive in a lead sheath, the shape of the coating (generally U or V) is obtained by deforming the cord according to this profile.
  • the cutting performance is not optimized and is not very reproducible because of the realization of the coating profile by stretch deformation of the sheath. Indeed this embodiment does not allow any flexibility on the relative placement of the explosive core relative to the coating (determination of shapes and relative thicknesses of the explosive and the coating).
  • the object of the invention is to provide a cutting line which is both reliable and optimized from the point of view of cutting characteristics, easy to manufacture at a lower cost, and compact.
  • the invention relates to a pyrotechnic cutting line comprising an explosive material disposed in a housing and against which is applied a metal profile forming a cutting coating, cord characterized in that the housing comprises at least two separate parts assembled the one to the other, a relatively thin rear part or casing and a thicker front part than the rear part, the front part having two lateral wings forming a support for the casing and connected by a thinner central area forming the cutting covering .
  • the front part may be constituted by a metal section.
  • the envelope may have a substantially constant thickness.
  • the envelope will advantageously be made of a plastic or composite material.
  • the explosive material may be in the form of a narrow sheet applied to the central zone of the front portion of the housing, sheet held in place by the envelope.
  • the explosive bead may be substantially cylindrical and obtained by extrusion.
  • the figure 1 shows a cord 1 according to a first embodiment of the invention.
  • This cord comprises a casing 2 which comprises at least two parts: a rear part or casing 2a and a front part 2b which are distinct from one another and assembled together so as to form a rigid assembly.
  • the front portion 2b is made in the form of a metal profile of a non-toxic material: aluminum, steel, copper ...
  • This profile is generally in the form of V or U returned. It comprises two lateral wings 3a and 3b which are connected by a median zone 4 which is thinner than the lateral wings.
  • This median zone 4 forms the cutting coating of the cord.
  • An explosive material 5 is applied against the medial zone 4 and is held in place by the envelope 2a.
  • the casing 2a is relatively thin and in particular that it is thinner than the front part 2b of the casing.
  • relatively thin is meant an envelope 2a whose thickness is three to five times lower than that of the front portion 2b.
  • the envelope 2a also has a substantially constant thickness.
  • the envelope may be made of a metallic material such as aluminum.
  • the envelope 2a will be made of a plastic material or a composite combining a plastic material and reinforcing fibers (glass fibers, Kevlar (trademark) or carbon).
  • the thickness of the envelope 2a will be chosen according to the mass of explosive 5 which is implemented.
  • the envelope 2a maintains the explosive material 5. It is attached to the front portion 2b at the outer surface of the side wings 3a and 3b thereof. The joining is for example ensured by gluing.
  • the front portion 2b of the housing also forms a support for the envelope 2a.
  • the median zone 4 (which is curved) is projected in the form of high speed jet.
  • the mechanical failure occurs preferentially at the level of zones 6 situated between the flanges 3a, 3b and the median zone 4, because of the abrupt change in the thickness of the front portion 2b at these zones 6.
  • the geometry of the front portion 2b is controlled. No longer with the invention reproducibility defects encountered with known cords lead sheath deformed. The reduced thickness of the envelope 2a also makes it possible to minimize the rear effects (projection of chips).
  • front portion 2b and in particular the differences in thickness between the median zone 4 and the wings 3a, 3b as a function of the mass of explosive 5 and the materials used to make the front portion 2b.
  • the explosive 5 is constituted by a narrow sheet which is applied and deformed on the central zone 4 of the front portion 2b of the housing.
  • the figure 2 shows in perspective the cutting line 1. This cord extends over a length L which is chosen according to the desired application.
  • the U-shape of the front portion 2b of the housing defines a cavity 7 which allows the formed charge jet to develop.
  • the depth of this cavity will correspond to the optimum distance to ensure between a shaped charge coating and a target to have the best perforation.
  • a light material for example a synthetic foam.
  • the initiation of the load 5 is provided by means of a priming means 8 which is arranged at one end of the cord. The other end is closed by a cover or a metal sheet (not shown).
  • the figure 3 shows a cutting line 1 according to another embodiment. This mode differs from the previous one in that the lateral wings 3a and 3b of the front portion 2b of the housing each comprise a notch 9 which constitutes the receptacle of the envelope 2a.
  • one of the lower edges of the wings 3a, 3b is rounded and the other edge is secured to a bracket 16 carrying at least one hole 17 for receiving a fixing means.
  • a bracket 16 carrying at least one hole 17 for receiving a fixing means.
  • Such a solution is suitable for laying a cord on a support.
  • the figure 4 schematizes the first steps of the method according to the invention.
  • a metal profile 2b having a generally V-shaped or U-shaped profile and having two lateral wings 3a, 3b separated by a median zone 4 which is thinner than the wings (possibly more legs) lateral fixation).
  • a metal section is easily manufactured by extrusion. It is then cut to the desired length.
  • a thin envelope 2a with a substantially constant thickness is also manufactured.
  • envelope can be made of a light metal (such as aluminum). It can then also be performed by extrusion.
  • the envelope 2a is made of a homogeneous plastic material or incorporating short fibers (less than 5 mm), it may also be produced by extrusion.
  • the envelope 2a is made of a long fiber composite material it can be achieved by weaving and then coating the fabric with a plastic material. The envelope will then be heat-formed to the desired U-shape using a suitable mold.
  • the explosive material is in the form of an elongated strap ( figure 4 ).
  • the width 1 of the strap 10 will be chosen substantially equal to the external length in section of the central zone 4 of the front portion 2b of the housing.
  • the figure 5 shows the succession of the different steps of this embodiment of the method:
  • step A1 is positioned the strap 10 at the central region 4 of the profile 2b, and then deformed so that it comes to marry this central area.
  • step B1 the envelope 2a is applied to the explosive strap 5 to close the housing.
  • the envelope 2a is fixed to the front part 2b by gluing the envelope 2a at the external surfaces of the lateral wings 3a, 3b.
  • This embodiment of the method comprises only assembly operations and is therefore particularly simple to implement.
  • the figure 6 schematizes another embodiment of the method according to the invention.
  • This embodiment differs from the previous one by the method of placing the explosive material 5.
  • an explosive lanyard is not cut to the desired dimensions, but a length of an extruded explosive material is cut in the form of a bead 11, for example cylindrical.
  • the thin envelope 2a is positioned in a matrix 13 comprising a cavity 12 of complementary shape to the external profile of the envelope 2a.
  • This explosive material is then compressed directly into the envelope 2a and with the aid of a punch 15 having a shape similar to that of the profile 2b which will then be used.
  • step B2 a layer of explosive material 5 is positioned in the envelope 2a and has the desired shape to receive the front portion 2b.
  • step C2 we finally position the profile 2b in the casing 2a carrying the explosive 5.
  • step C2 we finally position the profile 2b in the casing 2a carrying the explosive 5.
  • This embodiment simplifies the implementation of the explosive. It is indeed easier to compress a commercially available explosive cord than to cut an explosive sheet to the desired dimensions.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Toys (AREA)
  • Air Bags (AREA)

Abstract

The pyrotechnic cutting cord (1) useful in military aircrafts and launchers, comprises an explosive material (5) disposed in a casing (2), and a metallic profile that forms a coating of the cut and is applied against the explosive material. The casing comprises two distinct parts assembled one after the other. The two distinct parts include a thin rear part or a covering (2a), and a thick front part (2b). The front part comprises two lateral wings (3a, 3b) forming a support for the covering and connected by a median zone that forms the coating of the cut. The pyrotechnic cutting cord (1) useful in military aircrafts and launchers, comprises an explosive material (5) disposed in a casing (2), and a metallic profile that forms a coating of the cut and is applied against the explosive material. The casing comprises two distinct parts assembled one after the other. The two distinct parts include a thin rear part or a covering (2a), and a thick front part (2b). The front part comprises two lateral wings (3a, 3b) forming a support for the covering and connected by a median zone that forms the coating of the cut, and is constituted by the metallic profile. The covering has a constant thickness, and is made of plastic or a composite material. The explosive material is applied in the form of a narrow sheet on the median zone of the front part. The narrow sheet is maintained in a place by the covering. An independent claim is included for a process for the fabrication of a cutting cord.

Description

Le domaine technique de l'invention est celui des cordeaux de découpe pyrotechnique.The technical field of the invention is that of pyrotechnic cutting cords.

Ces cordeaux de découpe sont bien connus. Ils comprennent habituellement un matériau explosif qui est disposé dans un boîtier et contre lequel est appliqué un profil métallique formant revêtement de découpe.These cutting cords are well known. They usually comprise an explosive material which is arranged in a housing and against which is applied a metal profile forming a cutting coating.

Le boîtier et le revêtement sont habituellement de forme allongée, droite ou courbe. Le cordeau est appliqué contre la paroi à découper. L'initiation de l'explosif provoque la projection du revêtement à grande vitesse suivant le principe classique de fonctionnement des charges formées. Du fait de la forme allongée du cordeau, cette projection provoque une découpe le long de la ligne suivie par le cordeau.The housing and the coating are usually elongated, straight or curved. The cord is applied against the wall to be cut. The initiation of the explosive causes the projection of the coating at high speed according to the conventional principle of operation of the formed charges. Due to the elongated shape of the cord, this projection causes a cut along the line followed by the cord.

Le brevet US-4297946 A décrit ainsi un cordeau de découpe de type connu. Un tel cordeau est obtenu habituellement par étirage d'un explosif dans une gaine de plomb, la forme du revêtement (généralement en U ou en V) est obtenue en déformant le cordeau suivant ce profil.The patent US-4297946 A thus describes a cutting line of known type. Such a cord is usually obtained by stretching an explosive in a lead sheath, the shape of the coating (generally U or V) is obtained by deforming the cord according to this profile.

Un tel cordeau connu présente de nombreux inconvénients.Such a known cord has many disadvantages.

Tout d'abord les performances de découpe ne sont pas optimisées et sont peu reproductibles en raison de la réalisation du profil de revêtement par une déformation par étirage de la gaine. En effet ce mode de réalisation ne permet aucune souplesse sur le placement relatif de l'âme d'explosif par rapport au revêtement (détermination des formes et des épaisseurs relatives de l'explosif et du revêtement).First of all, the cutting performance is not optimized and is not very reproducible because of the realization of the coating profile by stretch deformation of the sheath. Indeed this embodiment does not allow any flexibility on the relative placement of the explosive core relative to the coating (determination of shapes and relative thicknesses of the explosive and the coating).

Ensuite le plomb est un matériau toxique dont la mise en oeuvre doit être limitée. Ce métal en particulier sera dans un proche avenir à proscrire pour les applications aéronautiques (cordeaux de découpe des verrières des aéronefs militaires) et spatiales (découpe de structures sur lanceurs).Then lead is a toxic material whose implementation must be limited. This metal in particular will be in the near future to proscribe for the aeronautical applications (cannons of canopy of military aircraft) and space (cutting of structures on launchers).

Enfin ce cordeau connu engendre des effets arrières (projection d'éclats de plomb) qui sont particulièrement néfastes dans le cadre d'une mise en oeuvre pour la découpe de verrières des aéronefs.Finally this known cord generates rear effects (projection of lead chips) which are particularly harmful in the context of an implementation for the cutting of canopies aircraft.

On connaît également par le brevet FR-2590661 A (Base du preambule de la revendication indépendante 1) un cordeau qui résout le problème de la fiabilité de la découpe en proposant un boîtier allongé en matière plastique à l'intérieur duquel est mis en place un explosif sur lequel est appliqué un revêtement.It is also known from the patent FR-2590661 A (Base of the preamble of the independent claim 1) a cord that solves the problem of the reliability of the cut in proposing an elongate plastic casing inside which is placed an explosive on which is applied a coating.

Un tel cordeau est cependant coûteux à réaliser. Le boîtier est encombrant et les effets arrières peuvent être encore gênants en raison de la présence de renforts métalliques dans la paroi du boîtier.Such a cord is however expensive to produce. The housing is bulky and the rear effects can be still troublesome because of the presence of metal reinforcements in the wall of the housing.

L'invention a pour objet de proposer un cordeau de découpe qui soit à la fois fiable et optimisé d'un point de vue des caractéristiques de découpe, facile à fabriquer à moindre coût, et peu encombrant.The object of the invention is to provide a cutting line which is both reliable and optimized from the point of view of cutting characteristics, easy to manufacture at a lower cost, and compact.

Ainsi, l'invention a pour objet un cordeau de découpe pyrotechnique comprenant un matériau explosif disposé dans un boîtier et contre lequel est appliqué un profil métallique formant revêtement de découpe, cordeau caractérisé en ce que le boîtier comporte au moins deux parties distinctes assemblées l'une à l'autre, une partie arrière ou enveloppe relativement mince et une partie avant plus épaisse que la partie arrière, la partie avant comportant deux ailes latérales formant support pour l'enveloppe et reliées par une zone médiane plus mince formant le revêtement de découpe.Thus, the invention relates to a pyrotechnic cutting line comprising an explosive material disposed in a housing and against which is applied a metal profile forming a cutting coating, cord characterized in that the housing comprises at least two separate parts assembled the one to the other, a relatively thin rear part or casing and a thicker front part than the rear part, the front part having two lateral wings forming a support for the casing and connected by a thinner central area forming the cutting covering .

La partie avant pourra être constituée par un profilé métallique.The front part may be constituted by a metal section.

L'enveloppe pourra avoir une épaisseur sensiblement constante.The envelope may have a substantially constant thickness.

L'enveloppe sera avantageusement réalisée en une matière plastique ou composite.The envelope will advantageously be made of a plastic or composite material.

Selon un mode particulier de réalisation, le matériau explosif pourra être sous la forme d'une feuille étroite appliquée sur la zone médiane de la partie avant du boîtier, feuille maintenue en place par l'enveloppe.According to a particular embodiment, the explosive material may be in the form of a narrow sheet applied to the central zone of the front portion of the housing, sheet held in place by the envelope.

L'invention a également pour objet un procédé de fabrication d'un tel cordeau, procédé comprenant les étapes suivantes :

  • fabrication d'un profilé métallique ayant un profil globalement en V ou en U et comportant deux ailes latérales séparées par une zone médiane plus mince que les ailes,
  • fabrication d'une enveloppe mince à épaisseur sensiblement constante, en matière plastique, métallique ou composite et ayant un profil globalement en V ou en U susceptible de coopérer avec le profilé en étant fixé au niveau des ailes de ce dernier.
The invention also relates to a method of manufacturing such a cord, a method comprising the following steps:
  • manufacture of a metal profile having a generally V-shaped or U-shaped profile and comprising two lateral wings separated by a median zone which is thinner than the wings,
  • manufacturing a thin envelope of substantially constant thickness, of plastic, metal or composite material and having a generally V-shaped or U-shaped profile capable of cooperating with the profile being fixed at the wings of the latter.

Selon un premier mode de réalisation de ce procédé,

  • le matériau explosif est mis à la forme d'une lanière allongée par la découpe d'une feuille,
  • la lanière est ensuite positionnée au niveau de la zone médiane du profilé puis déformée pour épouser cette dernière,
  • l'enveloppe est enfin appliquée sur la lanière et le profilé pour fermer le boîtier.
According to a first embodiment of this method,
  • the explosive material is in the form of a strip elongated by the cutting of a sheet,
  • the thong is then positioned at the middle region of the profile and then deformed to fit the latter,
  • the envelope is finally applied to the strap and the profile to close the case.

Selon un second mode de réalisation de ce procédé,

  • on positionne l'enveloppe mince dans une matrice comportant une forme complémentaire du profil externe de l'enveloppe,
  • on met en place dans le volume interne délimité par l'enveloppe un cordon d'un matériau explosif,
  • on comprime ce matériau dans l'enveloppe à l'aide d'un poinçon ayant une forme analogue à celle du profilé,
  • on positionne le profilé dans l'enveloppe portant l'explosif pour fermer le boîtier.
According to a second embodiment of this method,
  • positioning the thin envelope in a matrix having a shape complementary to the external profile of the envelope,
  • in the internal volume delimited by the envelope is placed a bead of an explosive material,
  • this material is pressed into the envelope by means of a punch having a shape similar to that of the profile,
  • the profile is positioned in the envelope carrying the explosive to close the housing.

Le cordon d'explosif pourra être sensiblement cylindrique et obtenu par extrusion.The explosive bead may be substantially cylindrical and obtained by extrusion.

Dans tous les cas on pourra fixer l'enveloppe au profilé par collage.In all cases we can fix the envelope to the profile by gluing.

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 desquels :

  • la figure 1 est une vue en coupe transversale d'un cordeau suivant un premier mode de réalisation de l'invention,
  • la figure 2 est une vue en perspective de ce cordeau,
  • la figure 3 est une vue en coupe transversale d'un cordeau suivant un deuxième mode de réalisation de l'invention,
  • la figure 4 est un synoptique schématisant les premières étapes du procédé selon l'invention,
  • la figure 5 est un synoptique schématisant les différentes étapes d'un premier mode de réalisation du procédé selon l'invention,
  • la figure 6 est un synoptique schématisant les différentes étapes d'un deuxième mode de réalisation du procédé selon l'invention.
The invention will be better understood on reading the following description of various embodiments, a description given with reference to the accompanying drawings and in which:
  • the figure 1 is a cross-sectional view of a cord according to a first embodiment of the invention,
  • the figure 2 is a perspective view of this cord,
  • the figure 3 is a cross-sectional view of a cord according to a second embodiment of the invention,
  • the figure 4 is a schematic diagram of the first steps of the method according to the invention,
  • the figure 5 is a block diagram schematically the different steps of a first embodiment of the method according to the invention,
  • the figure 6 is a block diagram schematically the different steps of a second embodiment of the method according to the invention.

La figure 1 montre un cordeau 1 selon un premier mode de réalisation de l'invention.The figure 1 shows a cord 1 according to a first embodiment of the invention.

Ce cordeau comprend un boîtier 2 qui comporte au moins deux parties : une partie arrière ou enveloppe 2a et une partie avant 2b distinctes l'une de l'autre et assemblées entre elles de manière à former un ensemble rigide.This cord comprises a casing 2 which comprises at least two parts: a rear part or casing 2a and a front part 2b which are distinct from one another and assembled together so as to form a rigid assembly.

La partie avant 2b est réalisée sous la forme d'un profilé métallique d'un matériau non toxique : aluminium, acier, cuivre...The front portion 2b is made in the form of a metal profile of a non-toxic material: aluminum, steel, copper ...

Ce profilé est globalement en forme de V ou de U retourné. Il comprend deux ailes latérales 3a et 3b qui sont reliées par une zone médiane 4 qui est plus mince que les ailes latérales.This profile is generally in the form of V or U returned. It comprises two lateral wings 3a and 3b which are connected by a median zone 4 which is thinner than the lateral wings.

Cette zone médiane 4 forme le revêtement de découpe du cordeau. Un matériau explosif 5 est appliqué contre la zone médiane 4 et il est maintenu en place par l'enveloppe 2a.This median zone 4 forms the cutting coating of the cord. An explosive material 5 is applied against the medial zone 4 and is held in place by the envelope 2a.

On voit sur la figure que l'enveloppe 2a est relativement mince et en particulier qu'elle est plus mince que la partie avant 2b du boîtier. Par relativement mince, on entend une enveloppe 2a dont l'épaisseur est trois à cinq fois inférieure à celle de la partie avant 2b. L'enveloppe 2a a par ailleurs une épaisseur sensiblement constante.It can be seen in the figure that the casing 2a is relatively thin and in particular that it is thinner than the front part 2b of the casing. By relatively thin, is meant an envelope 2a whose thickness is three to five times lower than that of the front portion 2b. The envelope 2a also has a substantially constant thickness.

L'enveloppe pourra être réalisée en un matériau métallique tel que l'aluminium. Avantageusement, on réalisera cependant l'enveloppe 2a en une matière plastique ou en un composite associant une matière plastique et des fibres de renfort (fibres de verre, de Kevlar (marque déposée) ou de carbone).The envelope may be made of a metallic material such as aluminum. Advantageously, however, the envelope 2a will be made of a plastic material or a composite combining a plastic material and reinforcing fibers (glass fibers, Kevlar (trademark) or carbon).

L'épaisseur de l'enveloppe 2a sera choisie en fonction de la masse d'explosif 5 qui est mise en oeuvre.The thickness of the envelope 2a will be chosen according to the mass of explosive 5 which is implemented.

Le fait de prévoir une enveloppe arrière 2a relativement mince et légère permet de minimiser les effets arrières du cordeau 1.Providing a relatively thin and light rear envelope 2a makes it possible to minimize the rear effects of the cord 1.

L'enveloppe 2a assure le maintien du matériau explosif 5. Elle est fixée à la partie avant 2b au niveau de la surface externe des ailes latérales 3a et 3b de celle-ci. La solidarisation est par exemple assurée par collage.The envelope 2a maintains the explosive material 5. It is attached to the front portion 2b at the outer surface of the side wings 3a and 3b thereof. The joining is for example ensured by gluing.

Ainsi, la partie avant 2b du boîtier forme aussi un support pour l'enveloppe 2a.Thus, the front portion 2b of the housing also forms a support for the envelope 2a.

Lors de l'initiation de l'explosif 5 la zone médiane 4 (qui est courbée) est projetée sous la forme de jet à haute vitesse. La rupture mécanique intervient d'une façon préférentielle au niveau de zones 6 situées entre les ailes 3a,3b et la zone médiane 4, cela en raison du changement brusque de l'épaisseur de la partie avant 2b au niveau de ces zones 6.At the initiation of the explosive 5 the median zone 4 (which is curved) is projected in the form of high speed jet. The mechanical failure occurs preferentially at the level of zones 6 situated between the flanges 3a, 3b and the median zone 4, because of the abrupt change in the thickness of the front portion 2b at these zones 6.

La forme particulière proposée par l'invention permet ainsi de fiabiliser les performances du cordeau de découpe.The particular form proposed by the invention thus makes it possible to make the performance of the cutting line reliable.

En effet, la géométrie de la partie avant 2b est maîtrisée. On n'a donc plus avec l'invention les défauts de reproductibilité rencontrés avec les cordeaux connus sous gaine de plomb déformée. L'épaisseur réduite de l'enveloppe 2a permet par ailleurs de minimiser les effets arrières (projection d'éclats).Indeed, the geometry of the front portion 2b is controlled. No longer with the invention reproducibility defects encountered with known cords lead sheath deformed. The reduced thickness of the envelope 2a also makes it possible to minimize the rear effects (projection of chips).

L'Homme du Métier dimensionnera la partie avant 2b et notamment les différences d'épaisseur entre la zone médiane 4 et les ailes 3a,3b en fonction de la masse d'explosif 5 et des matériaux mis en oeuvre pour réaliser la partie avant 2b.Those skilled in the art will size the front portion 2b and in particular the differences in thickness between the median zone 4 and the wings 3a, 3b as a function of the mass of explosive 5 and the materials used to make the front portion 2b.

Selon un premier mode de réalisation de l'invention, l'explosif 5 est constitué par une feuille étroite qui est appliquée et déformée sur la zone médiane 4 de la partie avant 2b du boîtier.According to a first embodiment of the invention, the explosive 5 is constituted by a narrow sheet which is applied and deformed on the central zone 4 of the front portion 2b of the housing.

La figure 2 montre en perspective le cordeau de découpe 1. Ce cordeau s'étend sur une longueur L qui est choisie en fonction de l'application souhaitée. La forme en U de la partie avant 2b du boîtier délimite une cavité 7 qui permet au jet de charge formée de se développer.The figure 2 shows in perspective the cutting line 1. This cord extends over a length L which is chosen according to the desired application. The U-shape of the front portion 2b of the housing defines a cavity 7 which allows the formed charge jet to develop.

D'une façon classique pour l'Homme du Métier du domaine de la pyrotechnie, la profondeur de cette cavité correspondra à la distance optimale à assurer entre un revêtement de charge formée et une cible pour avoir la perforation la meilleure.In a manner conventional to the skilled person in the field of pyrotechnics, the depth of this cavity will correspond to the optimum distance to ensure between a shaped charge coating and a target to have the best perforation.

Dans certaines applications (en particulier les cordeaux de découpe devant agir sous l'eau) il sera possible de remplir la cavité 7 avec un matériau léger, par exemple une mousse synthétique.In some applications (especially cutting cords having to act under water) it will be possible to fill the cavity 7 with a light material, for example a synthetic foam.

L'initiation de la charge 5 est assurée à l'aide d'un moyen d'amorçage 8 qui est disposé au niveau d'une extrémité du cordeau. L'autre extrémité est fermée par un couvercle ou une feuille métallique (non représentée).The initiation of the load 5 is provided by means of a priming means 8 which is arranged at one end of the cord. The other end is closed by a cover or a metal sheet (not shown).

La figure 3 montre un cordeau de découpe 1 suivant un autre mode de réalisation. Ce mode diffère du précédent en ce que les ailes latérales 3a et 3b de la partie avant 2b du boîtier comportent chacune une entaille 9 qui constitue le réceptacle de l'enveloppe 2a.The figure 3 shows a cutting line 1 according to another embodiment. This mode differs from the previous one in that the lateral wings 3a and 3b of the front portion 2b of the housing each comprise a notch 9 which constitutes the receptacle of the envelope 2a.

Une telle disposition améliore l'intégration de l'enveloppe 2a sur la partie avant 2b.Such an arrangement improves the integration of the envelope 2a on the front portion 2b.

Par ailleurs, un des bords inférieurs des ailes 3a,3b est arrondi et l'autre bord est solidaire d'une patte de fixation 16 portant au moins un trou 17 permettant de recevoir un moyen de fixation. Une telle solution est adaptée à la pose d'un cordeau sur un support. On pourrait à titre de variante définir un cordeau portant deux pattes de fixation, une au niveau de chaque aile 3a,3b.Furthermore, one of the lower edges of the wings 3a, 3b is rounded and the other edge is secured to a bracket 16 carrying at least one hole 17 for receiving a fixing means. Such a solution is suitable for laying a cord on a support. One could alternatively define a cord carrying two fastening tabs, one at each wing 3a, 3b.

La figure 4 schématise les premières étapes du procédé selon l'invention.The figure 4 schematizes the first steps of the method according to the invention.

Il est en effet tout d'abord nécessaire de fabriquer un profilé métallique 2b ayant un profil globalement en V ou en U et comportant deux ailes latérales 3a,3b séparées par une zone médiane 4 qui est plus mince que les ailes (plus éventuellement des pattes de fixation latérales). Un tel profilé métallique se fabrique aisément par extrusion. Il est découpé ensuite à la longueur souhaitée.It is first of all necessary to manufacture a metal profile 2b having a generally V-shaped or U-shaped profile and having two lateral wings 3a, 3b separated by a median zone 4 which is thinner than the wings (possibly more legs) lateral fixation). Such a metal section is easily manufactured by extrusion. It is then cut to the desired length.

On fabrique aussi par ailleurs une enveloppe 2a mince et à épaisseur sensiblement constante. Selon le cas cette enveloppe pourra être réalisée en un métal léger (tel que l'aluminium). Elle pourra alors elle aussi être réalisée par extrusion.In addition, a thin envelope 2a with a substantially constant thickness is also manufactured. Depending on the case envelope can be made of a light metal (such as aluminum). It can then also be performed by extrusion.

Si on réalise l'enveloppe 2a en une matière plastique homogène ou incorporant des fibres courtes (inférieures à 5 mm) on pourra également la réaliser par extrusion.If the envelope 2a is made of a homogeneous plastic material or incorporating short fibers (less than 5 mm), it may also be produced by extrusion.

Si l'enveloppe 2a est réalisée en un matériau composite à fibres longues on pourra la réaliser par tissage puis enduction du tissu à l'aide d'une matière plastique. L'enveloppe sera ensuite formée à la chaleur au profil en U souhaité à l'aide d'un moule approprié.If the envelope 2a is made of a long fiber composite material it can be achieved by weaving and then coating the fabric with a plastic material. The envelope will then be heat-formed to the desired U-shape using a suitable mold.

Quel que soit son mode de réalisation, on découpera bien entendu l'enveloppe 2a à la longueur souhaitée et déjà choisie pour le profilé 2b.Whatever its embodiment, it will of course cut the envelope 2a to the desired length and already chosen for the section 2b.

Suivant un premier mode de réalisation du procédé selon l'invention, le matériau explosif est mis à la forme d'une lanière 10 allongée (figure 4).According to a first embodiment of the method according to the invention, the explosive material is in the form of an elongated strap ( figure 4 ).

Il suffit pour cela de découper une feuille d'un matériau explosif plastique tel que le Formex (marque déposée).Simply cut a sheet of plastic explosive material such as Formex (trademark).

La largeur 1 de la lanière 10 sera choisie sensiblement égale à la longueur externe en section de la zone médiane 4 de la partie avant 2b du boîtier.The width 1 of the strap 10 will be chosen substantially equal to the external length in section of the central zone 4 of the front portion 2b of the housing.

La figure 5 montre la succession des différentes étapes de ce mode de réalisation du procédé :The figure 5 shows the succession of the different steps of this embodiment of the method:

A l'étape A1 on positionne la lanière 10 au niveau de la zone médiane 4 du profilé 2b, puis on la déforme pour qu-elle vienne épouser cette zone médiane.In step A1 is positioned the strap 10 at the central region 4 of the profile 2b, and then deformed so that it comes to marry this central area.

A l'étape B1 on applique l'enveloppe 2a sur la lanière d'explosif 5 pour fermer le boîtier. On fixe l'enveloppe 2a à la partie avant 2b par collage de l'enveloppe 2a au niveau des surfaces externes des ailes latérales 3a,3b.In step B1, the envelope 2a is applied to the explosive strap 5 to close the housing. The envelope 2a is fixed to the front part 2b by gluing the envelope 2a at the external surfaces of the lateral wings 3a, 3b.

L'assemblage étant ainsi achevé, le cordeau 1 est terminé (étape C1).The assembly being thus completed, the cord 1 is completed (step C1).

Ce mode de réalisation du procédé ne comporte que des opérations d'assemblage et il est donc particulièrement simple à mettre en oeuvre.This embodiment of the method comprises only assembly operations and is therefore particularly simple to implement.

La figure 6 schématise un autre mode de réalisation du procédé selon l'invention.The figure 6 schematizes another embodiment of the method according to the invention.

Ce mode de réalisation diffère du précédent par le mode de mise en place du matériau explosif 5.This embodiment differs from the previous one by the method of placing the explosive material 5.

Suivant ce procédé on ne découpe pas une lanière d'explosif aux dimensions souhaitées mais on découpe une longueur d'un matériau explosif extrudé sous la forme d'un cordon 11, par exemple cylindrique.According to this method, an explosive lanyard is not cut to the desired dimensions, but a length of an extruded explosive material is cut in the form of a bead 11, for example cylindrical.

Il est en effet facile d'obtenir commercialement de tels extrudés explosifs. Il suffit ensuite de les déformer pour leur donner la forme souhaitée.It is indeed easy to commercially obtain such explosive extrudates. Then simply deform to give them the desired shape.

Pour cela, à l'étape A2, on positionne l'enveloppe mince 2a dans une matrice 13 comportant une cavité 12 de forme complémentaire du profil externe de l'enveloppe 2a.For this, in step A2, the thin envelope 2a is positioned in a matrix 13 comprising a cavity 12 of complementary shape to the external profile of the envelope 2a.

On positionne ensuite dans le volume interne 14 délimité par l'enveloppe 2a un cordon 11 du matériau explosif.Then is positioned in the internal volume 14 delimited by the envelope 2a a cord 11 of the explosive material.

On comprime ensuite ce matériau explosif directement dans l'enveloppe 2a et à l'aide d'un poinçon 15 ayant une forme analogue à celle du profilé 2b qui sera ensuite mis en oeuvre.This explosive material is then compressed directly into the envelope 2a and with the aid of a punch 15 having a shape similar to that of the profile 2b which will then be used.

Le résultat obtenu après retrait du poinçon 15 est représenté à l'étape B2 : une couche de matériau explosif 5 est positionnée dans l'enveloppe 2a et elle a la forme souhaitée pour recevoir la partie avant 2b.The result obtained after removal of the punch 15 is shown in step B2: a layer of explosive material 5 is positioned in the envelope 2a and has the desired shape to receive the front portion 2b.

A l'étape C2 on positionne enfin le profilé 2b dans l'enveloppe 2a portant l'explosif 5. On referme ainsi le boîtier 2. La solidarisation de l'enveloppe 2a et de la partie avant 2b est là encore assurée par collage.In step C2 we finally position the profile 2b in the casing 2a carrying the explosive 5. Thus closes the housing 2. The fastening of the casing 2a and the front portion 2b is again ensured by bonding.

Ce mode de réalisation permet de simplifier la mise en oeuvre de l'explosif. Il est en effet plus aisé de comprimer un cordon explosif disponible dans le commerce que de découper une feuille d'explosif aux dimensions souhaitées.This embodiment simplifies the implementation of the explosive. It is indeed easier to compress a commercially available explosive cord than to cut an explosive sheet to the desired dimensions.

Claims (10)

  1. A pyrotechnic cutting cord (1) comprising an explosive material (5) arranged in a casing (2) and against which a metallic section is applied that forms a cutting coating, cord wherein the casing incorporates at least two separate parts assembled together, a rear part or envelope (2a) that is relatively thin and a front part (2b) that is thicker than the rear part (2a), the front part (2b) incorporating lateral wings (3a, 3b) forming a support for the envelope (2a) and linked by a thinner median zone (4) forming the cutting coating.
  2. A cutting cord according to Claim 1, wherein the front part (2b) is constituted by a metallic section.
  3. A cutting cord according to one of Claims 1 or 2, wherein the envelope (2a) is of substantially constant thickness.
  4. A cutting cord according to Claim 3, wherein the envelope (2a) is made of a plastic or composite material.
  5. A cutting cord according to one of Claims 1 to 4, wherein the explosive material (5) is in the form of a thin sheet applied to the median zone (4) of the front part (2b) of the casing (2), sheet held in place by the envelope (2a).
  6. Manufacturing process for a cutting cord according to one of Claims 1 to 5, process comprising the following steps:
    - manufacture of a metallic section (2b) having a globally V-shaped or U-shaped profile and incorporating two lateral wings (3a, 3b) separated by a median zone (4) that is thinner than the wings,
    - manufacture of a thin envelope (2a) of substantially constant thickness, of a plastic, metallic or composite material with a substantially V-shaped or U-shaped profile matching that of the metallic section (2b) and being fixed to the latter by the wings (3a, 3b).
  7. Manufacturing process according to Claim 6, wherein:
    - the explosive material (5) is in the form of a strip (10) stretched by cutting a sheet,
    - the strip (10) is then positioned on the median zone (4) of the section (2b) and then deformed to fit flush to it,
    - the envelope (2a) is then applied to the strip (10) and the section (2b) to close the casing.
  8. Manufacturing process according to Claim 6, wherein:
    - the thin envelope (2a) is positioned in a die (13) having a shape that matches that of the external profile of the envelope (2a),
    - a cord (11) of an explosive material is put in place in the inner volume delimited by the envelope (2a),
    - this material is compresses in the envelope (2a) using a punch (15) having a shape matching that of the section (2b),
    - the section (2b) is positioned in the envelope (2a) carrying the explosive (5) to close the casing (2).
  9. Manufacturing process according to Claim 8, wherein the explosive cord (11) is substantially cylindrical and obtained by extrusion.
  10. Manufacturing process according to one of Claims 6 to 9, wherein the envelope (2a) is fastened to the section (2b) by bonding.
EP08291238A 2007-12-26 2008-12-24 Pyrotechnical cutter fuse and method of manufacturing such a fuse Active EP2075525B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0709085A FR2925955A1 (en) 2007-12-26 2007-12-26 PYROTECHNIC CUTTING CORE AND METHOD FOR MANUFACTURING SUCH CORDEAU

Publications (2)

Publication Number Publication Date
EP2075525A1 EP2075525A1 (en) 2009-07-01
EP2075525B1 true EP2075525B1 (en) 2011-09-07

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ID=39720118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08291238A Active EP2075525B1 (en) 2007-12-26 2008-12-24 Pyrotechnical cutter fuse and method of manufacturing such a fuse

Country Status (4)

Country Link
EP (1) EP2075525B1 (en)
AT (1) ATE523755T1 (en)
ES (1) ES2372993T3 (en)
FR (1) FR2925955A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2333764A1 (en) * 1975-12-05 1977-07-01 Poudres & Explosifs Ste Nale PROCESS FOR MANUFACTURING DETONATING CORDS FOR CUTTING AND IMPROVED DIEDRICAL OR HOLLOW LOADS AND DEVICES THUS OBTAINED
DE7708557U1 (en) * 1977-03-19 1977-09-01 Hagenuk & Co Gmbh, 5750 Menden METAL INSERT FOR CUTTING CHARGES
US4297946A (en) 1978-12-05 1981-11-03 Paton Boris E Extended shaped charge and method of making same
GB2176878B (en) 1979-08-14 1987-09-03 Royal Ordnance Plc Hollow charges
FR2495991A1 (en) * 1980-12-15 1982-06-18 France Etat PYROTECHNIC METHODS AND DEVICES FOR CUTTING UNDER WATER USING DETONATING CORDE
US4649825A (en) * 1984-06-25 1987-03-17 The United States Of America As Represented By The Secretary Of The Navy Explosive separation system for composite materials

Also Published As

Publication number Publication date
ATE523755T1 (en) 2011-09-15
FR2925955A1 (en) 2009-07-03
EP2075525A1 (en) 2009-07-01
ES2372993T3 (en) 2012-01-30

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