WO2010040947A1 - Cutting detonating cord - Google Patents

Cutting detonating cord Download PDF

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Publication number
WO2010040947A1
WO2010040947A1 PCT/FR2009/051903 FR2009051903W WO2010040947A1 WO 2010040947 A1 WO2010040947 A1 WO 2010040947A1 FR 2009051903 W FR2009051903 W FR 2009051903W WO 2010040947 A1 WO2010040947 A1 WO 2010040947A1
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WO
WIPO (PCT)
Prior art keywords
dense
metal
detonating cord
charge
binder
Prior art date
Application number
PCT/FR2009/051903
Other languages
French (fr)
Inventor
Vincent Coisnon
Bernard Mahe
Bruno Nouguez
Original Assignee
Eurenco
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 Eurenco filed Critical Eurenco
Publication of WO2010040947A1 publication Critical patent/WO2010040947A1/en

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/04—Severing by squeezing
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/04—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive
    • C06B45/06—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component
    • C06B45/10—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component the organic component containing a resin
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B45/00—Compositions or products which are defined by structure or arrangement of component of product
    • C06B45/04—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive
    • C06B45/06—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component
    • C06B45/10—Compositions or products which are defined by structure or arrangement of component of product comprising solid particles dispersed in solid solution or matrix not used for explosives where the matrix consists essentially of nitrated carbohydrates or a low molecular organic explosive the solid solution or matrix containing an organic component the organic component containing a resin
    • C06B45/105—The resin being a polymer bearing energetic groups or containing a soluble organic explosive
    • 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

Definitions

  • the present invention relates to detonating cutting cords.
  • Said detonating cutting cords combine composition and geometry characteristics that make them particularly effective in a context of cutting structures.
  • detonating cords consist of a hollow charge with a metal coating are very effective but suffer from being very little deformable. This is why soft detonating cords have also been developed. They are for example described in patent applications EP 0 263 204 and WO 2004/048880. These soft detonating cords comprise a coating, made of a polymeric binder composite material incorporating a powdered metal filler composed of copper, tungsten or metal carbide, of encyclical form, covering the hollow portion (the groove) of an explosive hollow charge.
  • the explosive hollow charge of the cords of the prior art is thus covered in its hollow part by a metal coating; metal coating or polymeric coating loaded with a metal.
  • This architecture involves complex and expensive manufacturing processes.
  • dense composite explosives comprising, in a binder, an explosive charge and a high density metal particulate filler composed of tungsten. Other heavy metals are sometimes cited, but not used for reasons of cost and / or toxicity.
  • This type of dense composite explosive has been developed as an explosive charge of bombs with reduced collateral effects.
  • the present invention therefore relates to a detonating cutting line:
  • the detonating cutting cords of the invention are particularly interesting in that they consist of a dense explosive charge (material characteristic), in the state, in the form of a grooved bar (shape characteristic).
  • the qualifier "as is" of said charge means that said charge is not covered in its groove by a metal coating: metal coating or polymeric coating loaded with metal particles.
  • the detonating cutting cords according to the invention thus consisting of a hollow charge (hollow, by the presence of the groove), without a metal coating (metal or polymer loaded with metal particles) in their hollow part, flexible, present a cutting capacity close to that of the flexible cords of the prior art consisting of a hollow charge with a polymeric coating loaded with metal in their hollow part. .
  • the explosive charge (hollow) constituting a detonating cord of the invention is dense due to the presence of the dense metal particulate filler within it. Said load (and therefore said detonating cord of the invention) has a higher density than the usual explosive charges. It (II) has a density greater than 2 g / cm 3 .
  • Said metal particulate filler is dense. It generally has a density of between 12 and 19.2 g / cm 3 . Said density can be adjusted according to the exact constitution of said metal particulate filler. Said dense metal particulate filler intervenes in an amount adequate to impart the desired density to the detonating cord (to the dense explosive charge constituting said cord), to confer effectiveness to said detonating cord. The person skilled in the art has in fact understood that it is the "strong" density of the metallic particulate load associated with its amount of intervention within said detonating cord which induces the good efficiency of said detonating cord. The good results obtained were however not acquired in advance. Said dense metal particulate filler is generally present, within the dense explosive charge cords of the invention, at a rate of 30 to 90% by weight. Advantageously, it is present in a proportion of 50 to 80% by weight.
  • Said dense metal particulate filler of the dense explosive charge of the cords of the invention advantageously encloses; tungsten ("pure”) (W particles), and / or - tungsten carbide (“pure”) (WC particles), and / or tungsten carbide sintered with a metal binder (sintered toilet particles) and / or
  • the said metal binder (s) is (are) chosen from ductile metals, and in particular silver, copper, aluminum, nickel, cobalt, tin and their mixtures. Cobalt and / or copper and / or nickel are particularly suitable as metal binder.
  • Tungsten has a density of 19.2 g / cm 3 ; tungsten carbide a density of 15.6 g / cm 3 ; tungsten carbide sintered a density of less than 15.6 g / cm 3 ; tungsten sintered a density lower than 19.2 g / cm 3 .
  • Tungsten particles sintered or not
  • tungsten carbide particles sintered or not
  • particles of a different nature are susceptible to be present within the dense metal particulate filler of the detonation cord of the invention.
  • Said particulate metal filler may in particular contain aluminum particles. It is understood that the rate of intervention of such particles is limited by reference to the density parameter of the "overall" particulate load.
  • Said "overall" particulate filler generally consists of at least 70% by weight of tungsten, optionally sintered with a metal binder and / or tungsten carbide, optionally sintered with a metal binder. It may also be indicated in a non-limiting manner that particles of said dense metal particulate filler generally have a median diameter of between 0.5 ⁇ m and 100 ⁇ m, advantageously a median diameter of between 1 ⁇ m and 50 ⁇ m.
  • any solid high explosive energy charge may be suitable for the formulation of the dense explosive charge (constituting said cord of the invention).
  • said explosive charge consists of octogen (HMX), hexogen (RDX), nitroguanidine, triaminotrinitrobenzene (TATB), oxynitrotriazole (ONTA) or a mixture of such explosives. It can also consist of such explosives mixed with an oxidizing charge such as ammonium perchlorate or ammonium nitrate.
  • HMX octogen
  • RDX hexogen
  • TATB triaminotrinitrobenzene
  • ONTA oxynitrotriazole
  • Said binder can be an inert binder, such as a polymeric polyurethane binder, a rubber binder or an energy binder, such as a polymeric nitrogen binder. In any case, it is deformable and supports a certain lengthening without breaking.
  • the dense explosive charge constituting the detonation cord of the invention contains;
  • Said filler is a composite filler (cord) by the presence of the binder and it (II) contains a relatively high content of a dense metal particulate filler.
  • the detonating cord of the invention is in the form of a bar, said bar having a longitudinal groove. Its geometry is therefore that of a linear hollow charge. Said detonating cord, composite (with a flexible binder), in the form of a bar, is thus flexible. It can be curved.
  • the bar in question may have any section, including a circular section, oval, square, rectangular, trapezoidal ...
  • such a groove may be defined in particular by an inverted v ( ⁇ ) OR an u reversed ( ⁇ ), a circular profile, parabolic or hyperbolic.
  • the detonating cord of the invention as described above, characterized by its composition and shape, can in particular be obtained by compression, molding, machining or extrusion. These techniques are well known to those skilled in the art. Their implementation to obtain the dense cords of the invention (their constitutive dense explosive charge) do not pose any particular difficulties. Surprisingly, the dense detonating cutting cords of the invention have proved to be efficient, as efficient as the cords of the flexible prior art, with a polymer coating loaded with metal.
  • cords of the invention without metal coating in their groove, can however be manipulated and / or used with a sheath, such or such material, for example, a simple protective sheath.
  • Figure 2 shows a detonating cord according to Figure 1, positioned on a metal plate to be cut.
  • FIG. 1 thus shows in perspective a detonating cord of the invention 10, consisting of a dense explosive charge C.
  • Said detonating cord 10 has the shape of a bar 1, of polygonal section, with a longitudinal groove 2 in the shape of a V reversed.
  • Such a detonating cord (said dense explosive charge C) consists for example of:
  • Explosive energy charge RDX: 34%.
  • tungsten particulate filler W: 60%.
  • polyurethane binder PBHT: 6%.
  • the tungsten particles constituting said particulate filler have a median diameter of 40 microns.
  • Figure 2 therefore shows the detonating fuse line 10, shown in Figure 1 (250 mm long), disposed on a plate 3 of mild steel type E24.
  • Said plate 3 has a variable thickness, from 10 to 20 mm, along the cutting line of the detonating cord 10.
  • the distance 4, called “stand off”, distance away from the base of the dihedral relative to the plate 3, is 13 mm.
  • This distance 4 is provided by a foam wedge 5 disposed in (the hollow of) the dihedral groove 2 of the bar 1 (that is to say in the hollow of the cord 10).
  • FIG. 3 shows the shape of the cutout 20 obtained (seen from the side of the plate 3 of 20 mm thick), after the operation of the detonating cord 10 of the example.
  • Said cutout imprint 20 is sharp, very regular, with very few lateral projections, formed by a directional cutting jet.
  • the penetration of said cavity 20 into the plate 3 is about 10 mm. This penetration is of the same order of magnitude as that obtained with flexible linear cords of the prior art, having the same linear load of RDX, packaged in the form of a flexible cord of the prior art (with polymeric coating loaded with metal ).

Abstract

The present invention relates to a cutting detonating cord (10), consisting of a dense explosive charge (C) containing an explosive energy charge as well as a dense metal particulate charge in a flexible polymer binder, and made in the shape of a bar (1), said bar (1) comprising a groove (2) arranged longitudinally and free of any metal coating.

Description

CORDEAU DETONANT DE DECOUPAGE DETONATING CORDE OF CUTTING
La présente invention a pour objet des cordeaux détonants de découpage. Lesdits cordeaux détonants de découpage combinent des caractéristiques de composition et de géométrie qui les rendent particulièrement performants dans un contexte de découpe de structures.The present invention relates to detonating cutting cords. Said detonating cutting cords combine composition and geometry characteristics that make them particularly effective in a context of cutting structures.
Des cordeaux détonants de découpe linéaire ont été décrits dans la référence "Experiments in plate cutting by shaped high explosive charges," by AIO Zaide & al, Journal of Mechanical Engineering Science,Detonating linear cutting cords have been described in the reference "Experiments in the field of high explosive charges," by AIO Zaide et al, Journal of Mechanical Engineering Science,
Vol 13, n°l, p 13-25, 1971. Ils se présentent le plus généralement sous la forme de charge creuse explosive linéaire diédrique recouverte, au moins dans leur partie creuse, d'un revêtement en métal, généralement en cuivre ou en plomb. Le revêtement en métal est le plus souvent diédrique : sa section transversale forme un V. La détonation de la substance explosive projette les deux faces du revêtement en métal (faces intérieures du dièdre) dans le plan de symétrie dudit revêtement où leur collision donne naissance à un jet métallique plan, en forme de lame, animé d'une grande vitesse (plusieurs milliers de m/s). Lorsque le jet rencontre un matériau placé à proximité, il y creuse un sillon, ce qui entraîne la découpe. La substance explosive peut notamment être de type HMX ou RDX. Ces cordeaux détonants constitués d'une charge creuse avec un revêtement en métal sont très efficaces mais souffrent d'être très peu déformables. C'est pourquoi des cordeaux détonants souples ont aussi été développés. Ils sont par exemple décrits dans les demandes de brevet EP 0 263 204 et WO 2004/048880. Ces cordeaux détonants souples comprennent un revêtement, en matériau composite à liant polymérique incorporant une charge de métal pulvérulent composée de cuivre, de tungstène ou de carbure métallique, de forme dîédrique, recouvrant la partie creuse (la rainure) d'une charge creuse explosive.Vol 13, No. 1, p 13-25, 1971. They are most generally in the form of a dihedral linear explosive hollow charge covered, at least in their hollow part, with a metal coating, generally made of copper or aluminum. lead. The metal coating is usually dihedral: its cross section forms a V. The detonation of the explosive substance projects both sides of the metal coating (inner faces of the dihedron) into the plane of symmetry of said coating where their collision gives rise to a flat metal jet shaped blade, driven by a high speed (several thousand m / s). When the jet meets a nearby material, it furrows a groove, resulting in cutting. The explosive substance may in particular be of the HMX or RDX type. These detonating cords consist of a hollow charge with a metal coating are very effective but suffer from being very little deformable. This is why soft detonating cords have also been developed. They are for example described in patent applications EP 0 263 204 and WO 2004/048880. These soft detonating cords comprise a coating, made of a polymeric binder composite material incorporating a powdered metal filler composed of copper, tungsten or metal carbide, of encyclical form, covering the hollow portion (the groove) of an explosive hollow charge.
La charge creuse explosive des cordeaux de l'art antérieur est donc recouverte dans sa partie creuse par un revêtement métallique ; revêtement en métal ou revêtement polymérique chargé avec un métal. Cette architecture implique des procédés de fabrication complexes et coûteux.The explosive hollow charge of the cords of the prior art is thus covered in its hollow part by a metal coating; metal coating or polymeric coating loaded with a metal. This architecture involves complex and expensive manufacturing processes.
L'homme du métier est donc, à ce jour, toujours à la recherche de cordeaux détonants souples, pouvant être utilisés aussi bien dans une configuration linéaire que dans une configuration courbée, constitués d'une charge creuse sans revêtement métallique et d'une efficacité de découpe proche de celle des cordeaux souples de l'art antérieur.The person skilled in the art is therefore, to this day, still looking for soft detonating cords, which can be used both in a linear configuration that in a curved configuration, consisting of a hollow charge without metal coating and a cutting efficiency close to that of the flexible cords of the prior art.
L'homme du métier connaît par ailleurs les explosifs composites denses comprenant, dans un liant, une charge explosive et une charge particulaire métallique à forte densité composée de tungstène. D'autres métaux lourds sont parfois cités, mais non utilisés pour des raisons de coûts et/ou de toxicité. Ce type d'explosif composite dense a été développé comme charge explosive de bombes à effets collatéraux réduits. A ce propos, on peut par exemple se référer à l'enseignement des brevets US 3 528 864 et US 5 910 638.Those skilled in the art also know dense composite explosives comprising, in a binder, an explosive charge and a high density metal particulate filler composed of tungsten. Other heavy metals are sometimes cited, but not used for reasons of cost and / or toxicity. This type of dense composite explosive has been developed as an explosive charge of bombs with reduced collateral effects. In this regard, reference may be made, for example, to the teaching of US Pat. Nos. 3,528,864 and 5,910,638.
Il est du mérite des inventeurs d'avoir sélectionné ce type d'explosif (explosif composite dense ; c'est-à-dire avec liant et charges particulaires denses) et de lui proposer un débouché original en référence au problème technique évoqué ci-dessus : celui de la fourniture de cordeaux détonants de découpage souples constitués d'une charge creuse explosive sans revêtement métallique dans sa partie creuse, efficaces.... Il est également du mérite des inventeurs d'avoir élargi l'utilisation d'explosif composite dense, en référence à la nature de la charge particulaire dense. Outre le tungstène, le carbure de tungstène ("pur") ou(et) le carbure de tungstène fritte avec un liant métallique ou(et) le tungstène fritte avec un liant métallique, peu(ven)t convenir comme métal constitutif de la charge particulaire métallique en cause (voir ci-après).It is the merit of the inventors to have selected this type of explosive (dense composite explosive, that is to say with binder and dense particulate fillers) and to offer him an original outlet in reference to the technical problem mentioned above : that of the supply of soft detonating cutting cords consisting of an explosive hollow charge without metal coating in its hollow part, effective .... It is also the merit of the inventors to have expanded the use of dense composite explosive , with reference to the nature of the dense particulate charge. In addition to tungsten, tungsten carbide ("pure") or (and) tungsten carbide sintered with a metal binder or (and) tungsten sintered with a metal binder, may be suitable as the constituent metal of the filler. particulate metal involved (see below).
Selon son premier objet, la présente invention concerne donc un cordeau détonant de découpage :According to its first object, the present invention therefore relates to a detonating cutting line:
- constitué d'une charge explosive dense renfermant une charge énergétique explosive et une charge particulaire métallique dense dans un liant polymérique souple ; et- consisting of a dense explosive charge containing an explosive energy charge and a dense metal particulate charge in a flexible polymeric binder; and
- se présentant sous la forme d'une barre ; ladite barre comportant une rainure, agencée longitudînalement, sans revêtement métallique.- in the form of a bar; said bar having a groove, arranged longitudinally, without metal coating.
Les cordeaux détonants de découpage de l'invention sont particulièrement intéressants en ce qu'ils consistent en une charge explosive dense (caractéristique de matériau), en l'état, se présentant sous la forme d'une barre rainurée (caractéristique de forme). Le qualificatif "en l'état" de ladite charge signifie que ladite charge n'est pas recouverte dans sa rainure par un revêtement métallique : revêtement en métal ou revêtement polymérique chargé en particules métalliques. Les cordeaux détonants de découpage selon l'invention, constitués donc d'une charge creuse (creuse, de par la présence de la rainure), sans revêtement métallique (en métal ou polymérique chargé en particules métalliques) dans leur partie creuse, souples, présentent une capacité de découpe proche de celle des cordeaux souples de l'art antérieur constitués d'une charge creuse avec un revêtement polymérique chargé en métal dans leur partie creuse. . La charge explosive (creuse) constitutive d'un cordeau détonant de l'invention est dense du fait de la présence de la charge particulaire métallique dense en son sein. Ladite charge (et donc ledit cordeau détonant de l'invention) présente une masse volumique supérieure à celle des charges explosives usuelles. Elle(il) présente une masse volumique supérieure à 2 g/cm3.The detonating cutting cords of the invention are particularly interesting in that they consist of a dense explosive charge (material characteristic), in the state, in the form of a grooved bar (shape characteristic). The qualifier "as is" of said charge means that said charge is not covered in its groove by a metal coating: metal coating or polymeric coating loaded with metal particles. The detonating cutting cords according to the invention, thus consisting of a hollow charge (hollow, by the presence of the groove), without a metal coating (metal or polymer loaded with metal particles) in their hollow part, flexible, present a cutting capacity close to that of the flexible cords of the prior art consisting of a hollow charge with a polymeric coating loaded with metal in their hollow part. . The explosive charge (hollow) constituting a detonating cord of the invention is dense due to the presence of the dense metal particulate filler within it. Said load (and therefore said detonating cord of the invention) has a higher density than the usual explosive charges. It (II) has a density greater than 2 g / cm 3 .
Ladite charge particulaire métallique est dense. Elle présente généralement une masse volumique comprise entre 12 et 19,2 g/cm3. Ladite masse volumique peut être ajustée en fonction de la constitution exacte de ladite charge particulaire métallique. Ladite charge particulaire métallique dense intervient en une quantité adéquate pour conférer la densité recherchée au cordeau détonant (à la charge explosive dense constitutive dudit cordeau), pour conférer l'efficacité audit cordeau détonant. L'homme du métier a en effet compris que c'est la "forte" masse volumique de la charge particulaire métallique associée à sa quantité d'intervention au sein dudit cordeau détonant qui induit la bonne efficacité dudit cordeau détonant. Les bons résultats obtenus n'étaient toutefois nullement acquis par avance. Ladite charge particulaire métallique dense est généralement présente, au sein de la charge explosive dense des cordeaux de l'invention, à raison de 30 à 90 % en masse. Avantageusement, elle y est présente à raison de 50 à 80 % en masse.Said metal particulate filler is dense. It generally has a density of between 12 and 19.2 g / cm 3 . Said density can be adjusted according to the exact constitution of said metal particulate filler. Said dense metal particulate filler intervenes in an amount adequate to impart the desired density to the detonating cord (to the dense explosive charge constituting said cord), to confer effectiveness to said detonating cord. The person skilled in the art has in fact understood that it is the "strong" density of the metallic particulate load associated with its amount of intervention within said detonating cord which induces the good efficiency of said detonating cord. The good results obtained were however not acquired in advance. Said dense metal particulate filler is generally present, within the dense explosive charge cords of the invention, at a rate of 30 to 90% by weight. Advantageously, it is present in a proportion of 50 to 80% by weight.
Ladite charge particulaire métallique dense de la charge explosive dense des cordeaux de l'invention renferme avantageusement ; - du tungstène ("pur") (des particules de W)), et/ou - du carbure de tungstène ("pur") (des particules de WC), et/ou - du carbure de tungstène fritte avec un liant métallique (des particules de WC fritte) et/ouSaid dense metal particulate filler of the dense explosive charge of the cords of the invention advantageously encloses; tungsten ("pure") (W particles), and / or - tungsten carbide ("pure") (WC particles), and / or tungsten carbide sintered with a metal binder (sintered toilet particles) and / or
- du tungstène fritte avec un liant métallique (des particules de W fritte). Le(s)dit(s) liant(s) métallique(s) est(sont) choisi(s) parmi les métaux ductiles, et notamment l'argent, le cuivre, l'aluminium, Ie nickel, Ie cobalt, l'étain et leurs mélanges. Le cobalt et/ou le cuivre et/ou le nickel conviennent tout particulièrement comme liant métallique.- Sintered tungsten with a metal binder (particles of W sintered). The said metal binder (s) is (are) chosen from ductile metals, and in particular silver, copper, aluminum, nickel, cobalt, tin and their mixtures. Cobalt and / or copper and / or nickel are particularly suitable as metal binder.
Le tungstène présente une masse volumique de 19,2 g/cm3 ; le carbure de tungstène une masse volumique de 15,6 g/cm3 ; le carbure de tungstène fritte une masse volumique inférieure à 15,6 g/cm3 ; le tungstène fritte une masse volumique inférieure à 19,2 g/cm3.Tungsten has a density of 19.2 g / cm 3 ; tungsten carbide a density of 15.6 g / cm 3 ; tungsten carbide sintered a density of less than 15.6 g / cm 3 ; tungsten sintered a density lower than 19.2 g / cm 3 .
Ces métaux denses sont a priori les plus intéressants. La présence de métaux lourds, tels l'uranium, le tantale, le vanadium, le niobium, l'osmium et le rhénium n'est pas totalement exclue mais lesdits métaux lourds sont coûteux et/ou toxiques.These dense metals are a priori the most interesting. The presence of heavy metals such as uranium, tantalum, vanadium, niobium, osmium and rhenium is not totally excluded but said heavy metals are expensive and / or toxic.
Des particules de tungstène (fritte ou non) et des particules de carbure de tungstène (fritte ou non) peuvent être utilisées conjointement.Tungsten particles (sintered or not) and tungsten carbide particles (sintered or not) can be used together.
On peut ainsi notamment régler la densité (la masse volumique) de la charge particulaire métallique dense et donc celle de la charge explosive dense et donc celle du cordeau détonant.It is thus possible in particular to adjust the density (the density) of the dense metal particulate filler and therefore that of the dense explosive charge and therefore that of the detonating cord.
De manière générale, en référence à un tel réglage de la densité et/ou pour assurer d'autres fonctions (auxiliaire de fabrication, agent de combustion...), des particules d'une autre nature (que W et WC) sont susceptibles d'être présentes au sein de la charge particulaire métallique dense du cordeau détonant de l'invention. Ladite charge particulaire métallique peut notamment renfermer des particules d'aluminium. On comprend que le taux d'intervention de telles particules reste limité en référence au paramètre densité de Ia charge particulaire "globale".In general, with reference to such a density adjustment and / or to ensure other functions (manufacturing auxiliary, combustion agent, etc.), particles of a different nature (than W and WC) are susceptible to be present within the dense metal particulate filler of the detonation cord of the invention. Said particulate metal filler may in particular contain aluminum particles. It is understood that the rate of intervention of such particles is limited by reference to the density parameter of the "overall" particulate load.
Ladite charge particulaire "globale" est généralement constituée d'au moins 70 % en masse de tungstène, éventuellement fritte avec un liant métallique et/ou de carbure de tungstène, éventuellement fritte avec un liant métallique, On peut également indiquer de manière nullement limitative que les particules de ladite charge particulaire métallique dense présentent généralement un diamètre médian compris entre 0,5 μm et 100 μm, avantageusement un diamètre médian compris entre 1 μm et 50 μm.Said "overall" particulate filler generally consists of at least 70% by weight of tungsten, optionally sintered with a metal binder and / or tungsten carbide, optionally sintered with a metal binder. It may also be indicated in a non-limiting manner that particles of said dense metal particulate filler generally have a median diameter of between 0.5 μm and 100 μm, advantageously a median diameter of between 1 μm and 50 μm.
En référence à la charge énergétique explosive de la charge explosive dense du cordeau détonant de l'invention, on peut indiquer ce qui suit.With reference to the explosive energy charge of the dense explosive charge of the detonating cord of the invention, the following can be indicated.
Toute charge énergétique explosive performante solide peut convenir à la formulation de la charge explosive dense (constitutive dudit cordeau de l'invention). Avantageusement, ladite charge explosive consiste en de l'octogène (HMX), de Phexogène (RDX), de la nitroguanidine, du triaminotrinitrobenzène (TATB), de Poxynitrotriazole (ONTA) ou en un mélange de tels explosifs. Elle peut aussi consister en de tels explosifs en mélange avec une charge oxydante telle que le perchlorate d'ammonium ou le nitrate d'ammonium. En référence au liant intervenant, on a vu qu'il s'agit d'un liant polymérique souple. Le cordeau détonant est ainsi souple. Il peut être courbé. Ledit liant peut être un liant inerte, tel un liant polymérique polyuréthane, un liant caoutchoutique ou un liant énergétique, tel un liant polymérique azoté. En tout état de cause, il est déformable et supporte un allongement certain sans rupture.Any solid high explosive energy charge may be suitable for the formulation of the dense explosive charge (constituting said cord of the invention). Advantageously, said explosive charge consists of octogen (HMX), hexogen (RDX), nitroguanidine, triaminotrinitrobenzene (TATB), oxynitrotriazole (ONTA) or a mixture of such explosives. It can also consist of such explosives mixed with an oxidizing charge such as ammonium perchlorate or ammonium nitrate. With reference to the intervening binder, we have seen that it is a flexible polymeric binder. The detonating cord is thus flexible. It can be curved. Said binder can be an inert binder, such as a polymeric polyurethane binder, a rubber binder or an energy binder, such as a polymeric nitrogen binder. In any case, it is deformable and supports a certain lengthening without breaking.
Selon une variante particulièrement préférée, la charge explosive dense constitutive du cordeau détonant de l'invention renferme ;According to a particularly preferred variant, the dense explosive charge constituting the detonation cord of the invention contains;
- de 9 % à 69 % en masse, avantageusement de 19 % à 49 % en masse, d'une charge énergétique explosive, - de 30 % à 90 % en masse, avantageusement de 50 % àfrom 9% to 69% by weight, advantageously from 19% to 49% by weight, of an explosive energy charge, from 30% to 90% by weight, advantageously from 50% to
80 % en masse, d'une charge particulaire métallique dense, et80% by weight, of a dense metal particulate filler, and
- de 1 % à 10 % en masse d'un liant polymérique souple, inerte ou énergétique.from 1% to 10% by weight of a flexible, inert or energetic polymeric binder.
Ladite charge(ledit cordeau détonant) est une(un) charge(cordeau) composite de par la présence du liant et elle(il) renferme une relative forte teneur en une charge particulaire métallique dense.Said filler (said detonating cord) is a composite filler (cord) by the presence of the binder and it (II) contains a relatively high content of a dense metal particulate filler.
. Le cordeau détonant de l'invention se présente sous la forme d'une barre, ladite barre comportant une rainure longitudinale. Sa géométrie donc est celle d'une charge creuse linéaire. Ledit cordeau détonant, composite (avec un liant souple), sous la forme d'une barre, est ainsi souple. Il peut être courbé. La barre en cause peut présenter une section quelconque, notamment une section circulaire, ovale, carrée, rectangulaire, trapézoïdale.... The detonating cord of the invention is in the form of a bar, said bar having a longitudinal groove. Its geometry is therefore that of a linear hollow charge. Said detonating cord, composite (with a flexible binder), in the form of a bar, is thus flexible. It can be curved. The bar in question may have any section, including a circular section, oval, square, rectangular, trapezoidal ...
Sur sa longueur (sur l'une de ses faces, lorsqu'elle présente une section délimitée par un polygone), elle présente une rainure. Sur une coupe transversale de ladite barre, une telle rainure peut notamment être délimitée par un v renversé (Λ) OU un u renversé (π), un profil circulaire, parabolique ou hyperbolique.Along its length (on one of its faces, when it has a section delimited by a polygon), it has a groove. In a cross section of said bar, such a groove may be defined in particular by an inverted v (Λ) OR an u reversed (π), a circular profile, parabolic or hyperbolic.
Le cordeau détonant de l'invention, tel que décrit ci-dessus, caractérisé par sa composition et sa forme, peut notamment être obtenu par compression, moulage, usinage ou extrusion. Ces techniques sont parfaitement connues de l'homme du métier. Leur mise en œuvre pour l'obtention des cordeaux denses de l'invention (de leur charge explosive dense constitutive) ne posent pas de difficultés particulières. De façon surprenante, les cordeaux détonants de découpage denses de l'invention se sont révélés performants, aussi performants que les cordeaux de l'art antérieur souples, avec revêtement polymérique chargé en métal.The detonating cord of the invention, as described above, characterized by its composition and shape, can in particular be obtained by compression, molding, machining or extrusion. These techniques are well known to those skilled in the art. Their implementation to obtain the dense cords of the invention (their constitutive dense explosive charge) do not pose any particular difficulties. Surprisingly, the dense detonating cutting cords of the invention have proved to be efficient, as efficient as the cords of the flexible prior art, with a polymer coating loaded with metal.
Lesdits cordeaux, souples, selon l'invention (sans revêtement métallique dans leur partie creuse), performants, répondent ainsi au cahier des charges formulé dans l'introduction du présent texte.Said cords, flexible, according to the invention (without metal coating in their hollow part), performant, and meet the specifications formulated in the introduction of this text.
On note incidemment ici que les cordeaux de l'invention, sans revêtement métallique dans leur rainure, peuvent toutefois être manipulés et/ou utilisés avec une gaine, en tel ou tel matériau, par exemple, une simple gaine de protection.It is noted here incidentally that the cords of the invention, without metal coating in their groove, can however be manipulated and / or used with a sheath, such or such material, for example, a simple protective sheath.
On se propose maintenant d'illustrer, de façon nullement limitative, la présente invention, par les figures annexées et l'exemple présenté en référence auxdites figures.It is now proposed to illustrate, in a non-limiting manner, the present invention, by the accompanying figures and the example presented with reference to said figures.
La figure 1 montre en perspective un cordeau détonant de l'invention (= une charge explosive dense avec rainure, ladite rainure ne comportant pas de revêtement métallique).Figure 1 shows in perspective a detonating cord of the invention (= a dense explosive charge with a groove, said groove having no metal coating).
La figure 2 montre un cordeau détonant selon la figure 1, positionné, sur une plaque métallique à découper.Figure 2 shows a detonating cord according to Figure 1, positioned on a metal plate to be cut.
La figure 3 montre l'empreinte de découpe obtenue avec une un tel cordeau détonant de découpage. La figure 1 montre donc en perspective un cordeau détonant de l'invention 10, consistant en une charge explosive dense C. Ledit cordeau détonant 10 présente Ia forme d'une barre 1, de section polygonale, avec une rainure longitudinale 2 en forme de V renversé. Un tel cordeau détonant (ladite charge explosive dense C) est constitué(e) par exemple, de :Figure 3 shows the cutout impression obtained with such a detonating cutting line. FIG. 1 thus shows in perspective a detonating cord of the invention 10, consisting of a dense explosive charge C. Said detonating cord 10 has the shape of a bar 1, of polygonal section, with a longitudinal groove 2 in the shape of a V reversed. Such a detonating cord (said dense explosive charge C) consists for example of:
. charge énergétique explosive : RDX : 34 % . charge particulaire de tungstène : W : 60 % . liant polyuréthanne : PBHT : 6 %. Les particules de tungstène constitutives de ladite charge particulaire présentent un diamètre médian de 40 μm.. Explosive energy charge: RDX: 34%. tungsten particulate filler: W: 60%. polyurethane binder: PBHT: 6%. The tungsten particles constituting said particulate filler have a median diameter of 40 microns.
Le cordeau détonant 10 présente la géométrie montrée sur les figures 1 et 2. Ses dimensions sont les suivantes : hauteur ; H = 18,75 mm longueur : L = 250 mm largeur : Ii = 21,58 mm largeur au sommet : b : 8,01 mm.The detonating cord 10 has the geometry shown in Figures 1 and 2. Its dimensions are as follows: height; H = 18.75 mm length: L = 250 mm width: Ii = 21.58 mm width at the top: b: 8.01 mm.
La rainure longitudinale 2 est donc diédrîque. Ses dimensions sont les suivantes : profondeur : P = 8,75 mm angle d'ouverture : α = 100°.The longitudinal groove 2 is diédrîque. Its dimensions are as follows: depth: P = 8.75 mm opening angle: α = 100 °.
La figure 2 montre donc le cordeau détonant de découpage 10, montré sur la figure 1 (de 250 mm de long), disposé sur une plaque 3 en acier doux type E24. Ladite plaque 3 présente une épaisseur variable, de 10 à 20 mm, le long de la ligne de découpe du cordeau détonant 10. La distance 4, dite de "stand off", distance d'éloignement de la base du dièdre par rapport à la plaque 3, est de 13 mm. Cette distance 4 est assurée par une cale en mousse 5 disposée dans (le creux de) la rainure diédrique 2 de la barre 1 (c'est-à-dire dans le creux du cordeau 10). La figure 3 montre l'allure de l'empreinte de découpe 20 obtenue (vue du côté de la plaque 3 de 20 mm d'épaisseur), après le fonctionnement du cordeau détonant 10 de l'exemple. Ladite empreinte de découpe 20 est nette, très régulière, avec très peu de projections latérales, formée par un jet de découpe directionnel. La pénétration de ladite empreinte 20 dans la plaque 3 est de 10 mm environ. Cette pénétration est du même ordre de grandeur que celle obtenue avec des cordeaux linéaires souples de l'art antérieur, possédant la même charge linéique de RDX, conditionnés sous forme d'un cordeau souple de l'art antérieur (avec revêtement polymérique chargé en métal). Figure 2 therefore shows the detonating fuse line 10, shown in Figure 1 (250 mm long), disposed on a plate 3 of mild steel type E24. Said plate 3 has a variable thickness, from 10 to 20 mm, along the cutting line of the detonating cord 10. The distance 4, called "stand off", distance away from the base of the dihedral relative to the plate 3, is 13 mm. This distance 4 is provided by a foam wedge 5 disposed in (the hollow of) the dihedral groove 2 of the bar 1 (that is to say in the hollow of the cord 10). FIG. 3 shows the shape of the cutout 20 obtained (seen from the side of the plate 3 of 20 mm thick), after the operation of the detonating cord 10 of the example. Said cutout imprint 20 is sharp, very regular, with very few lateral projections, formed by a directional cutting jet. The penetration of said cavity 20 into the plate 3 is about 10 mm. This penetration is of the same order of magnitude as that obtained with flexible linear cords of the prior art, having the same linear load of RDX, packaged in the form of a flexible cord of the prior art (with polymeric coating loaded with metal ).

Claims

REVEN DICCTQNS REVEN DICCTQNS
1. Cordeau détonant de découpage (10), caractérisé en ce qu'il est constitué d'une charge explosive dense (C) renfermant une charge énergétique explosive et une charge particulaire métallique dense dans un liant polymérique souple et se présentant sous la forme d'une barre (1) ; ladite barre (1) comportant une rainure (2), agencée longitudinalement, sans revêtement métallique.1. detonating cutting line (10), characterized in that it consists of a dense explosive charge (C) containing an explosive energy charge and a dense metal particulate charge in a flexible polymeric binder and is in the form of a bar (1); said bar (1) having a groove (2), arranged longitudinally, without metal coating.
2. Cordeau détonant (10) selon la revendication 1, caractérisé en ce que la ladite charge particulaire métallique dense a une masse volumique comprise entre 12 et 19,2 g/cm3.2. Detonating cord (10) according to claim 1, characterized in that said dense metal particulate filler has a density of between 12 and 19.2 g / cm 3 .
3. Cordeau détonant (10) selon la revendication 1 ou 2, caractérisé en ce que ladite charge particulaire métallique dense comprend du tungstène et/ou du carbure de tungstène et/ou du tungstène fritte avec un liant métallique et/ou du carbure de tungstène fritte avec un liant métallique.The detonating cord (10) according to claim 1 or 2, characterized in that said dense metal particulate filler comprises tungsten and / or tungsten carbide and / or tungsten sintered with a metal binder and / or tungsten carbide sintered with a metal binder.
4. Cordeau détonant (10) selon la revendication 3, caractérisé en ce que ledit liant métallique est choisi parmi le cuivre, le nickel, le cobalt et leurs mélanges.4. detonating cord (10) according to claim 3, characterized in that said metal binder is selected from copper, nickel, cobalt and mixtures thereof.
5. Cordeau détonant (10) selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ladite charge particulaire métallique dense comprend des particules d'aluminium.The detonating cord (10) according to any one of claims 1 to 4, characterized in that said dense metal particulate filler comprises aluminum particles.
6. Cordeau détonant (10) selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ladite charge particulaire métallique dense est constituée au moins à 70 % en masse de tungstène et/ou de carbure de tungstène et/ou de tungstène fritte avec un liant métallique et/ou de carbure de tungstène fritte avec un liant métallique.6. detonating cord (10) according to any one of claims 1 to 5, characterized in that said dense metal particulate filler comprises at least 70% by weight of tungsten and / or tungsten carbide and / or tungsten sintered with a metal binder and / or tungsten carbide sintered with a metal binder.
7. Cordeau détonant (10) selon l'une quelconque des revendications 1 à 6, caractérisé en ce que les particules de ladite charge particulaire métallique dense présentent un diamètre médian compris entre 0,5 μm et 100 μm, avantageusement compris entre 1 μm et 50 μm. 7. detonating cord (10) according to any one of claims 1 to 6, characterized in that the particles of said dense metal particulate filler have a median diameter of between 0.5 microns and 100 microns, advantageously between 1 micron and 50 μm.
8, Cordeau détonant (10) selon l'une quelconque des revendications 1 à 7, caractérisé en ce que ladite charge énergétique explosive consiste en de l'octogène, de l'hexogène, de la nitroguanidine, du triaminotrinitrobenzène, de l'oxynitrotriazole ou en un mélange de ces explosifs, éventuellement en mélange avec une charge oxydante.8, detonating cord (10) according to any one of claims 1 to 7, characterized in that said explosive energy charge consists of octogen, hexogen, nitroguanidine, triaminotrinitrobenzene, oxynitrotriazole or in a mixture of these explosives, optionally mixed with an oxidizing charge.
9. Cordeau détonant (10) selon l'une quelconque des revendications 1 à 8, caractérisé en ce que ladite charge explosive dense (C) renferme :9. detonating cord (10) according to any one of claims 1 to 8, characterized in that said dense explosive charge (C) contains:
- de 9 % à 69 % en masse, avantageusement de 19 % à 49 % en masse, d'une charge énergétique explosive,from 9% to 69% by weight, advantageously from 19% to 49% by mass, of an explosive energy charge,
- de 30 % à 90 % en masse, avantageusement de 50 % à 80 % en masse, d'une charge particulaire métallique dense, etfrom 30% to 90% by weight, advantageously from 50% to 80% by weight, of a dense metal particulate filler, and
- de 1 % à 10 % en masse d'un liant polymérique souple inerte ou énergétique.from 1% to 10% by weight of an inert or energetic flexible polymeric binder.
10. Cordeau détonant (10) selon l'une quelconque des revendications 1 à 9, caractérisé en ce qu'il est obtenu par compression, par moulage, par usinage ou par extrusion. 10. detonating cord (10) according to any one of claims 1 to 9, characterized in that it is obtained by compression, molding, machining or extrusion.
PCT/FR2009/051903 2008-10-06 2009-10-06 Cutting detonating cord WO2010040947A1 (en)

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