EP1585933A1 - Method of assembling a pyrotechnic separation device and pyrotechnic separation device thus obtained - Google Patents

Method of assembling a pyrotechnic separation device and pyrotechnic separation device thus obtained

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Publication number
EP1585933A1
EP1585933A1 EP04705109A EP04705109A EP1585933A1 EP 1585933 A1 EP1585933 A1 EP 1585933A1 EP 04705109 A EP04705109 A EP 04705109A EP 04705109 A EP04705109 A EP 04705109A EP 1585933 A1 EP1585933 A1 EP 1585933A1
Authority
EP
European Patent Office
Prior art keywords
initiation
tube
envelope
loaded
separation device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP04705109A
Other languages
German (de)
French (fr)
Other versions
EP1585933B1 (en
Inventor
Pierre Morlighem
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EADS Space Transportation SA
Original Assignee
EADS Space Transportation SA
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 EADS Space Transportation SA filed Critical EADS Space Transportation SA
Publication of EP1585933A1 publication Critical patent/EP1585933A1/en
Application granted granted Critical
Publication of EP1585933B1 publication Critical patent/EP1585933B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
    • F42B15/36—Means for interconnecting rocket-motor and body section; Multi-stage connectors; Disconnecting means
    • F42B15/38—Ring-shaped explosive elements for the separation of rocket parts

Definitions

  • the present invention relates to the field of pyrotechnic separation, in particular to the separation of two elements of aeronautical or spacecraft, such as for example the cap or protective panels of measurement devices of a rocket and the body of the rocket.
  • It relates to a method of assembling a pyrotechnic separation device, as well as a pyrotechnic separation device obtained by the implementation of this assembly method.
  • the document WO 87/07006 describes a pyrotechnic separation device which comprises at least one charged tube formed of an envelope containing over its entire length a detonating cord.
  • the loaded tube is arranged between two machine elements which must be separated from each other, along a cutting area between the two machine elements.
  • the envelope is made of a deformable metallic material, and has in a first operating configuration a flat cross section, for example oblong or oval. It is filled with a flexible material within which the detonating cord is placed.
  • the separation device is held in place inside a housing running through the cutting area.
  • the wall of this housing has, distributed over its entire length, areas of weakness, which are areas where said wall is thinned.
  • the firing of the detonating cord at at least one of the ends of the separation device and the propagation of a subsequent shock wave inside the charged tube cause the deformation thereof, step by step.
  • Said loaded tube then tends to take a second operating configuration in which it has a circular cross section. This radial expansion of the loaded tube has the consequence that the weakening zones of the housing break along the cutting area between the two machine elements, which, gradually, separates these two machine elements .
  • Document O-87/07006 does not provide any indication of the ends of the pyrotechnic separation device.
  • FIG. 5 A conventional pyrotechnic separation device of the prior art, seen at its ends, is illustrated in Figure 5 in top view.
  • the separation device 110 comprises at each of its ends an initiation nozzle 120, which is connected on the one hand to one end of a charged tube 112 and on the other hand to a connecting cord 180, itself connected to a firing device (not shown in Figure 5), through which the initiation is initiated fire from the detonating cord, and which is distant from the separation device.
  • the separation device 110 is received in a housing 106 which is continuous over the entire length corresponding to the loaded tube 112, and which has a discontinuity corresponding to the location of the initiation nozzle 120 associated with said end of the separation device 110. This discontinuity results in an opening 108 made in the wall 109 of at least one of the two machine elements which must be separated.
  • the firing is caused at both ends of the loaded tube 112, in order to counter the possibility of a firing failure which would occur at one of these ends, which requires the presence of two initiation tips 120 and two connections with a firing cord 180.
  • the positioning of the separation device 110 in the housing 106 is such that the two end caps 120 are in close proximity to each other, which requires an opening 108 having a greater length in the cutting plan.
  • the initiation nozzle 120 of the prior art is a segment of substantially straight tube, which has at one end an assembly orifice 126 for its assembly with the envelope, and at the other end a firing orifice 124 for its connection with the firing cord 180.
  • a method of manufacturing a conventional pyrotechnic separation device of the prior art takes place as follows:
  • an initiation nozzle 120 is assembled at each end of the envelope, by a conventional assembly process, for example by screwing into the assembly orifice 126 of the initiation nozzle 120,
  • the sheath containing the detonating cord is introduced, through an introduction orifice 124 of the initiation nozzle 120, said introduction orifice 124 being for this purpose oriented in such a way that its axis is parallel to the longitudinal direction common to the initiation end piece and to the envelope, then said sheath is moved step by step inside the initiation end piece and the envelope,
  • a firing cord 180 is connected to each initiation nozzle 120, for example by screwing, in the firing orifice 124 of the initiation nozzle 120,
  • the tube loaded with the flexible sheath containing the detonating cord is deformed, to bring it into its first operating configuration in which it has a flattened shape over its entire length, by an appropriate deformation process, for example by a process pressing or other calibrated crushing process.
  • the shape of the initiation tip 120 is conditioned by the manufacturing process which has just been recalled. For reasons of convenience, the introduction orifice is merged with the firing orifice 124.
  • the firing orifice 124 and the assembly orifice 126 of the initiation nozzle 120 are aligned with each other in the longitudinal direction thereof, so that we can introduce and slide the flexible sheath containing the detonating cord in the initiation tip 120 and then in the envelope, according to the longitudinal direction common to the initiation tip 120 and to the casing.
  • the firing orifice 124 therefore serves both to connect the firing cord to the initiation tip 120, and to introduce the flexible sheath containing the detonating cord.
  • This introduction function requires that the initiation nozzle has a certain length, designated by D in FIG. 5, in order to be able to guide the flexible sheath.
  • connection between the initiation tip and the firing cord is made on a connection portion, designated by 140 in Figure 5, which occupies a certain length Dl, in the longitudinal direction of the tip initiation, which accordingly increases the length L, in the cutting plane, of the opening 108 made in said wall 109 of at least one of the two machine elements which must be
  • the tube deformation operation is done after its assembly with the initiation tip, because otherwise it would not be possible, or in any case very difficult, to introduce the flexible sheath containing the detonating cord into an already flattened envelope .
  • the loaded tube has a transient portion, designated by 150 in FIG. 5, along which its section passes progressively in a substantially circular shape, near the end piece. initiation, to a substantially flattened shape, where it has been deformed.
  • This transient portion 150 occupies a certain length D2, which consequently increases the length L, in the cutting plane, of the opening 108 made in said wall 109 of at least one of the two machine elements.
  • An object of the present invention is to obtain a pyrotechnic separation device which retains the main advantage of the separation device of the prior art, namely allowing a clean separation of the elements, that is to say that the residues explosive material remains inside the tube. Indeed, one of the two machine elements to be separated is very often a compartment in which there are sophisticated, fragile and expensive electronic equipment, which must not be polluted during the separation of the elements.
  • a further object of the present invention is to minimize the stresses on the edges of openings in the wall of the at least one machine component to be separated. For this, it is necessary to reduce the length of these openings in the cutting plane. To do this, we seek to reduce the length D of each initiation nozzle and / or the length D1 of the associated connection portion, and / or to reduce the length D2 of the associated transient portion.
  • a solution consists in previously loading an envelope having a substantially circular cross section with the flexible sheath containing the detonating cord, then in deforming the loaded tube to give its cross section a flattened shape on its entire length, and finally to assemble the initiation nozzle on one end of said loaded tube, through the assembly orifice of the initiation nozzle. Consequently, the firing orifice of the initiation nozzle only serves to connect the latter with the firing cord, and no longer serves to introduce the flexible sheath containing the detonating cord. It follows on the one hand that the transient portion is eliminated, since the deformation of the loaded tube takes place over its entire length. The length D2 can thus be deleted.
  • the elimination of the transient portion also has the advantage of reducing the manufacturing costs of the separation device.
  • Another object of the present invention is to guarantee that the assembly between the loaded tube and the initiation nozzle ensures good sealing conditions to preserve the detonating cord from the humidity of the ambient air.
  • the heating of the parts during welding must not cause inadvertent ignition or destruction of the detonating cord which is already inside the envelope at the time of assembly.
  • the present invention therefore provides a method of assembling a pyrotechnic separation device by which at least one initiation nozzle is directly assembled at one end of a tube. previously loaded and deformed, said initiation nozzle having a reduced longitudinal dimension compared to the initiation nozzles of the prior art, and said assembly method ensuring the tightness of the assembly. It also proposes a pyrotechnic separation device obtained by this process.
  • the method of assembling a pyrotechnic separation device comprises:
  • the method comprises a prior step during which the loaded tube is deformed to give its cross section a flattened shape over its entire length.
  • said flattened cross section has an oblong or oval or elliptical shape.
  • the method comprises an initial step during which an envelope having a cross section of substantially circular shape is loaded with a flexible material and a detonating cord, said flexible material forming a sheath for said detonating cord.
  • the separation device comprises more than one initiation nozzle, the succession of the above-mentioned steps is repeated for each assembly of an initiation nozzle with an end of tube previously loaded and deformed.
  • said weld bead is produced between a thinned peripheral zone of an assembly wall surrounding an assembly orifice of the initiation nozzle and the envelope.
  • Said welding points pass through the thinned peripheral zone of the assembly wall and penetrate into the envelope without passing through it.
  • this spot welding is carried out by means of a laser welding apparatus of the pulsed YAG laser type. Its operating parameters are adjusted in such a way that the temperature rise at the detonating cord is perfectly controlled.
  • the pyrotechnic separation device comprises at least one tube loaded with a detonating cord and at least one initiation tip assembled on said charged tube by the implementation of a conforming assembly process to the first aspect of the invention.
  • the initiation nozzle is provided with an assembly orifice delimited by an assembly wall which comprises a thinned peripheral zone.
  • the initiation nozzle has a bent shape, for example forming substantially a right angle.
  • FIG. 1 is a perspective view of part of a cutting area between two machine elements, showing two initiation tips assembled on two respective ends placed end to end of two tubes loaded with a device pyrotechnic separation;
  • FIG. 2 illustrates in longitudinal section an initiation nozzle assembled on one end of a tube loaded with a pyrotechnic separation device
  • FIG. 3 is an enlarged partial view illustrating the assembly by welding between the initiation tip and the loaded tube of Figure 2; and - the.
  • Figure 4 is a close-up view of a welding spot to illustrate its shape and dimensions;
  • FIG. 5 already described, is a top view of part of a cutting area between two machine elements, showing two initiation tips assembled on two ends put end to end of a tube loaded with a pyrotechnic separation device of the prior art.
  • FIG. 1 illustrates only part of the two elements 2, 4, which each have an overall shape of a substantially circular crown.
  • This cutting area is traversed by a peripheral housing 6 which comprises, in the example illustrated, a wall 62 belonging to the machine element 2 and a wall 64 belonging to the machine element 4.
  • Said peripheral housing 6 receives.
  • pyrotechnic separation devices 10. These are, in this example, two in number and arranged end to end. They each include a loaded tube 12 and two initiation tips 20. Due to the substantially circular configuration of the cutting zone of the present example, it has two substantially diametrically opposite locations, in which there are two initiation tips.
  • FIG. 2 illustrates, in longitudinal section, one end of a pyrotechnic separation device 10, which comprises a charged tube 12 and an initiation nozzle 20.
  • the charged tube 12 comprises a metal casing 13, preferably made of stainless steel. It is equipped over its entire length with a detonating cord 14 constituting a core of said charged tube 12, and with a flexible sheath 16 which fills the space between the casing 13 and the detonating cord 14.
  • the charged tube 12 has was obtained by introducing into the envelope 13 a flexible material containing the detonating cord 1, said flexible material forming a sheath 16 for said detonating cord 14.
  • Said flexible sheath 16 is made of a damping material, such as for example silicone.
  • the loaded tube 12 has been previously deformed over its entire length. It has a flattened cross section, for example oblong, oval or elliptical. A firing of the detonating cord will cause a radial expansion of the loaded tube 12 which will tend to adopt a configuration in which it will have a substantially circular cross section.
  • the initiation tip 20 is a metal tip, preferably made of stainless steel refined under vacuum, which has a length D along its longitudinal direction which is also the longitudinal direction of the loaded tube 12. It comprises: - a tip body 22 a firing orifice 24 intended for connection with a firing cord 80
  • FIG. 1 (represented by broken lines in FIG. 1), which in the example illustrated is a screw-type connection, and an assembly orifice 26 for its assembly with the loaded tube 12.
  • the tip body 22 preferably has an angled shape.
  • the firing orifice 24 and the assembly orifice 26 have axes which intersect, forming, in the example illustrated, an angle substantially equal to 90 °.
  • the assembly orifice 26 has a cross section whose shape and dimensions are adapted to that of the cross section of the end of the loaded tube 12. It is delimited by an assembly wall 28 which is part of the body d end piece 22.
  • the assembly wall 28 has a thinned peripheral zone 30 and ends in a reinforcing ring 32.
  • the thinned peripheral zone 30 is shown on a larger scale in FIG. 3, which illustrates the actual assembly of the initiation nozzle 20 on the loaded tube 12.
  • the method of assembling the separation device 10 comprises a step for fitting the end of the loaded tube 12 into the assembly orifice 26, and a step of joining by welding the thinned peripheral zone 30 to the flattened envelope 13. These two steps can be preceded by a step of loading the envelope 13 with the detonating cord 14 surrounded by its flexible sheath 16, and / or by a step of deformation of the cross section of the loaded tube 12.
  • This deformation is carried out on the entire length of the loaded tube 12, and tends to flatten its cross section, to give it an oblong, or oval, or elliptical, or other flattened shape.
  • Welding is a fusion welding of metal, which is carried out by means of a laser welding machine of the pulsed YAG laser type, the operating parameters of which are adjusted, so that the temperature generated at the detonating cord does not exceed not a maximum value T M.
  • this maximum value T M is fixed at 100 ° C.
  • the main operating parameters are the welding speed, the welding energy, the pulse duration, the pulse frequency of the laser beam, the focal length of the objective, and the shooting distance.
  • a vacuum-refined stainless steel has the advantage, compared to a stainless steel that would not be vacuum-refined, of a lower sensitivity to cracking which sometimes occurs during laser welding, due to the rapid solidification of molten areas.
  • the welding step consists in making successive welding points 40 on the thinned peripheral zone 30, by overlapping the weld points 40 along the periphery of the thinned peripheral zone 30, so as to form one or more weld bead (s) 42 peripheral (s) and continuous (s).
  • the weld points 40 of the same weld bead 42 are regularly distributed over the entire circumference of the thinned peripheral zone 30, so that said weld bead 42 is closed.
  • the weld points 40 pass through the thinned peripheral zone 30 of the assembly wall 28, and penetrate into the envelope 13 without passing through it.
  • the assembly of the initiation nozzle 20 on one end of the loaded tube 12 is obtained as soon as one has produced a peripheral and continuous weld bead 42.
  • a peripheral and continuous weld bead 42 To improve the mechanical strength and tightness of the assembly, it is preferred to produce several peripheral and continuous weld beads 42 which are substantially parallel to one another.
  • the number of weld beads 42 is limited by the width of the thinned peripheral zone 30. It is preferably between two and six, and even more preferably equal to four. Said width of the thinned peripheral zone is noted a.
  • the weld beads 42 are spaced from each other in the direction of the width a of the thinned peripheral zone 30. According to another preferred variant, illustrated in FIG. 3, the weld beads 42 are contiguous in the direction of the width a of the thinned peripheral zone 30.
  • the height of the thinned peripheral zone is denoted hl
  • the axial distance between two adjacent weld beads 42 is denoted c
  • the distance between each end weld bead 42 and each edge of the thinned peripheral zone 30 is denoted b
  • the total welding width is noted 1.
  • FIG. 4 is illustrated in section and in an enlarged manner a weld point 40. It has a base portion 44 which opens to the outside at the surface of the thinned peripheral zone 30, and a foot portion 46 which penetrates into the casing 13.
  • the base 44 has substantially a dome shape and the foot 46 has substantially a cylindrical shape or a frustoconical shape which decreases as it moves away from the base 44.
  • the end of the foot 46 penetrating into the casing 13 ends with a substantially rounded tip 47.
  • the surface of the base 44 which opens to the outside has a recess 45.
  • the junction between the base 44 and the foot 46 has a substantially funnel-shaped profile.
  • the base 44 has a diameter dl and its hollow 45 has a height e.
  • the foot 46 has a diameter d2.
  • its diameter d2 is axially variable.
  • d2p the diameter d2 at the joint plane between the thinned peripheral zone 30 and the envelope 13.
  • the weld point 40 has a total height h.2 which is the sum of a through height hl equal to the height of the thinned peripheral zone 30 crossed by the points of weld 40 and a penetrating height h3 which corresponds to the penetration height of the weld points 40 in the casing 13.
  • the envelope 13 was loaded with a silicone sheath 13 containing a detonating cord 14.
  • the loaded tube thus formed was crushed to have a cross section of oblong shape, with two straight parts and two rounded parts.
  • a pulsed YAG laser welding process was used, with a microsoldering center known under the name LASAG PM 300.
  • the temperature generated at the detonating cord remained below 80 ° C.
  • the weld beads 42 were joined.
  • the weld points 40 had the following dimensions:
  • - base diameter 1.2 mm ⁇ dl ⁇ 1.6 mm
  • An initiation nozzle 20 was used whose length D along the longitudinal direction of the loaded tube was substantially between 30 and 35 millimeters, more precisely substantially equal to 32.7 millimeters, whereas according to the prior art a initiation nozzle having a firing and introduction orifice axially aligned with the assembly orifice, and having a length D of 58.4 mm.
  • the length L, in the cutting plane, of the opening made in the wall of the machine element has been reduced to 116 millimeters, whereas with a separation device of the prior art, we should have practiced an opening with a length L of 230 mm.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Bags (AREA)

Abstract

The invention relates to a method of assembling a pyrotechnic separation device (10). The inventive method comprises the following steps consisting in: fitting a filled tube (12), comprising a casing (13) containing a detonating cord (14), into an initiation end piece (20); and connecting the filled tube (12) and the initiation end piece (20) by means of fusion welding, by producing successive welding points (40) which overlap such as to form at least one peripheral, continuous, closed weld bead (42). The pyrotechnic separation device (10) is obtained using the inventive assembling method. The invention can be used for the separation of aeronautical or space vehicle elements (2, 4).

Description

PROCEDE D'ASSEMBLAGE D'UN DISPOSITIF DE SEPARATION METHOD FOR ASSEMBLING A SEPARATION DEVICE
PYROTECHNIQUE, ET DISPOSITIF DE SEPARATIONPYROTECHNIC, AND SEPARATION DEVICE
PYROTECHNIQUE OBTENU PAR CE PROCEDEPYROTECHNIQUE OBTAINED BY THIS PROCESS
DESCRIPTIONDESCRIPTION
DOMAINE TECHNIQUETECHNICAL AREA
La présente invention se rapporte au domaine de la séparation pyrotechnique, notamment à la séparation de deux éléments d'engins aéronautiques ou spatiaux, comme par exemple la coiffe ou des panneaux de protection d'appareils de mesure d'une fusée et le corps de la fusée .The present invention relates to the field of pyrotechnic separation, in particular to the separation of two elements of aeronautical or spacecraft, such as for example the cap or protective panels of measurement devices of a rocket and the body of the rocket.
Elle vise un procédé d'assemblage d'un dispositif de séparation pyrotechnique, ainsi qu'un dispositif de séparation pyrotechnique obtenu par la mise en œuvre de ce procédé d'assemblage.It relates to a method of assembling a pyrotechnic separation device, as well as a pyrotechnic separation device obtained by the implementation of this assembly method.
ETAT DE LA TECHNIQUE ANTERIEURESTATE OF THE PRIOR ART
Le document WO 87/07006 décrit un dispositif de séparation pyrotechnique qui comprend au moins un tube chargé formé d'une enveloppe contenant sur toute sa longueur un cordeau détonant . Le tube chargé est disposé entre deux éléments d'engin qui doivent être séparés l'un de l'autre, le long d'une zone de découpage entre les deux éléments d'engin. L'enveloppe est constituée d'un matériau métallique déformable, et présente dans une première configuration de fonctionnement une section transversale aplatie, par exemple oblongue ou ovale. Elle est remplie d'un matériau souple au sein duquel se trouve placé le cordeau détonant. Le dispositif de séparation est maintenu en place à l'intérieur d'un logement parcourant la zone de découpage. La paroi de ce logement présente, réparties sur toute sa longueur, des zones d'affaiblissement, qui sont des zones où ladite paroi est amincie.The document WO 87/07006 describes a pyrotechnic separation device which comprises at least one charged tube formed of an envelope containing over its entire length a detonating cord. The loaded tube is arranged between two machine elements which must be separated from each other, along a cutting area between the two machine elements. The envelope is made of a deformable metallic material, and has in a first operating configuration a flat cross section, for example oblong or oval. It is filled with a flexible material within which the detonating cord is placed. The separation device is held in place inside a housing running through the cutting area. The wall of this housing has, distributed over its entire length, areas of weakness, which are areas where said wall is thinned.
La mise à feu du cordeau détonant à l'une au moins des extrémités du dispositif de séparation et la propagation d'une onde de choc subséquente à l'intérieur du tube chargé provoquent la déformation de celui-ci, de proche en proche. Ledit tube chargé tend alors à prendre une deuxième configuration de fonctionnement dans laquelle il présente une section transversale circulaire. Cette expansion radiale du tube chargé a pour conséquence que les zones d'affaiblissement du logement se rompent, le long de la zone de découpage entre les deux éléments d' engin, ce qui, de proche en proche, sépare ces deux éléments d' engin.The firing of the detonating cord at at least one of the ends of the separation device and the propagation of a subsequent shock wave inside the charged tube cause the deformation thereof, step by step. Said loaded tube then tends to take a second operating configuration in which it has a circular cross section. This radial expansion of the loaded tube has the consequence that the weakening zones of the housing break along the cutting area between the two machine elements, which, gradually, separates these two machine elements .
Le document O-87/07006 ne fournit pas d'indication sur les extrémités du dispositif de séparation pyrotechnique.Document O-87/07006 does not provide any indication of the ends of the pyrotechnic separation device.
Un dispositif de séparation pyrotechnique classique de l'art antérieur, vu au niveau de ses extrémités, est illustré sur la figure 5 en vue de dessus. De manière connue en soi, le dispositif de séparation 110 comprend à chacune de ses extrémités un embout d'initiation 120, qui est raccordé d'une part à une extrémité d'un tube chargé 112 et d'autre part à un cordon de mise à feu 180, lui-même raccordé à un dispositif de mise à feu (non représenté sur la figure 5), par l'intermédiaire duquel est initiée la mise à feu du cordeau détonant, et qui est éloigné du dispositif de séparation.A conventional pyrotechnic separation device of the prior art, seen at its ends, is illustrated in Figure 5 in top view. In a manner known per se, the separation device 110 comprises at each of its ends an initiation nozzle 120, which is connected on the one hand to one end of a charged tube 112 and on the other hand to a connecting cord 180, itself connected to a firing device (not shown in Figure 5), through which the initiation is initiated fire from the detonating cord, and which is distant from the separation device.
Le dispositif de séparation 110 est reçu dans un logement 106 qui est continu sur toute la longueur correspondant au tube chargé 112, et qui présente une discontinuité correspondant à l'emplacement de l'embout d'initiation 120 associé à ladite extrémité du dispositif de séparation 110. Cette discontinuité se traduit par une ouverture 108 pratiquée dans la paroi 109 de l'un au moins des deux éléments d'engin qui doivent être séparés .The separation device 110 is received in a housing 106 which is continuous over the entire length corresponding to the loaded tube 112, and which has a discontinuity corresponding to the location of the initiation nozzle 120 associated with said end of the separation device 110. This discontinuity results in an opening 108 made in the wall 109 of at least one of the two machine elements which must be separated.
Un inconvénient important de cette configuration réside dans le fait que, dans la zone de découpage, le bord de cette ouverture 108 est une zone de concentration de contraintes. Les contraintes sont d'autant plus élevées qu'est grande la longueur de ce bord dans le plan de découpage, ou dans un plan sensiblement parallèle au plan de découpage. On rappelle que le plan de découpage est défini comme étant un plan médian de la zone de découpage entre les deux éléments d'engins qui doivent être séparés.An important drawback of this configuration lies in the fact that, in the cutting area, the edge of this opening 108 is a stress concentration area. The constraints are higher the greater the length of this edge in the cutting plane, or in a plane substantially parallel to the cutting plane. It will be recalled that the cutting plane is defined as being a median plane of the cutting zone between the two elements of machines which must be separated.
De manière connue en soi, on provoque la mise à feu aux deux extrémités du tube chargé 112, afin de parer à l'éventualité d'une défaillance de mise à feu qui se produirait à une de ces extrémités, ce qui nécessite la présence de deux embouts d' initiation 120 et de deux raccordements avec un cordon de mise à feu 180.In a manner known per se, the firing is caused at both ends of the loaded tube 112, in order to counter the possibility of a firing failure which would occur at one of these ends, which requires the presence of two initiation tips 120 and two connections with a firing cord 180.
De plus, lorsque la zone de découpage présente sensiblement un contour fermé comme c'est le cas par exemple pour la séparation entre la coiffe et le corps d'une fusée, le positionnement du dispositif de séparation 110 dans le logement 106 est tel que les deux embouts d'extrémité 120 se trouvent à proximité immédiate l'un de l'autre, ce qui nécessite une ouverture 108 ayant une plus grande longueur dans le plan de découpage.In addition, when the cutting area has a substantially closed contour as is the case for example for the separation between the cap and the body of a rocket, the positioning of the separation device 110 in the housing 106 is such that the two end caps 120 are in close proximity to each other, which requires an opening 108 having a greater length in the cutting plan.
Enfin, dans le cas de structures d'engin à contour fermé de grand diamètre, pour des facilités de mise en oeuvre, il est connu par l'homme du métier de disposer deux dispositifs de séparation 110, ou trois, ou davantage, mis bout à bout et ayant chacun un embout d'initiation à chaque extrémité. Cela conduit à deux emplacements correspondant aux embouts d'initiation 120 disposés de manière à être sensiblement diamétralement opposés (ou trois, ou davantage) , et donc à deux ouvertures 108 (ou trois, ou davantage) pratiquées dans la paroi 109 de l'un au moins des éléments qui doivent être séparés .Finally, in the case of structures with a closed contour of large diameter, for ease of implementation, it is known to those skilled in the art to have two separation devices 110, or three, or three, or more, brought to end. end and each having an initiation tip at each end. This leads to two locations corresponding to the initiation tips 120 arranged so as to be substantially diametrically opposite (or three, or more), and therefore to two openings 108 (or three, or more) made in the wall 109 of one at least elements that need to be separated.
De manière classique, l'embout d'initiation 120 de l'art antérieur est un segment de tube sensiblement rectiligne, qui comporte à une extrémité un orifice d'assemblage 126 pour son assemblage avec l'enveloppe, et à l'autre extrémité un orifice de mise à feu 124 pour son raccordement avec le cordon de mise à feu 180. De manière connue en soi, un procédé de fabrication d'un dispositif de séparation pyrotechnique classique de l'art antérieur se déroule de la manière suivante :Conventionally, the initiation nozzle 120 of the prior art is a segment of substantially straight tube, which has at one end an assembly orifice 126 for its assembly with the envelope, and at the other end a firing orifice 124 for its connection with the firing cord 180. In a manner known per se, a method of manufacturing a conventional pyrotechnic separation device of the prior art takes place as follows:
- on part d'une enveloppe, ayant une section circulaire, on assemble un embout d'initiation 120 à chaque extrémité de l'enveloppe, par un procédé d'assemblage classique, par exemple par vissage dans l'orifice d'assemblage 126 de l'embout d'initiation 120,- we start from an envelope, having a circular section, an initiation nozzle 120 is assembled at each end of the envelope, by a conventional assembly process, for example by screwing into the assembly orifice 126 of the initiation nozzle 120,
- on introduit ensuite la gaine contenant le cordeau détonant, par un orifice d'introduction 124 de l'embout d'initiation 120, ledit orifice d'introduction 124 étant à cet effet orienté de telle manière que son axe soit parallèle à la direction longitudinale commune à l'embout d'initiation et à l'enveloppe, puis on fait coulisser ladite gaine de proche en proche à l'intérieur de l'embout d'initiation et de l'enveloppe,- Then the sheath containing the detonating cord is introduced, through an introduction orifice 124 of the initiation nozzle 120, said introduction orifice 124 being for this purpose oriented in such a way that its axis is parallel to the longitudinal direction common to the initiation end piece and to the envelope, then said sheath is moved step by step inside the initiation end piece and the envelope,
- on raccorde un cordon de mise à feu 180 à chaque embout d'initiation 120, par exemple par vissage, dans l'orifice de mise à feu 124 de l'embout d'initiation 120,a firing cord 180 is connected to each initiation nozzle 120, for example by screwing, in the firing orifice 124 of the initiation nozzle 120,
- on déforme enfin le tube chargé de la gaine souple contenant le cordeau détonant, pour l'amener dans sa première configuration de fonctionnement dans laquelle il présente une forme aplatie sur toute sa longueur, par un procédé approprié de déformation, par exemple par un procédé de pressage ou autre procédé d'écrasement calibré. La forme de l'embout d'initiation 120 est conditionnée par le procédé de fabrication qui vient d'être rappelé. Pour des raisons de commodité, l'orifice d'introduction est confondu avec l'orifice de mise à feu 124. L'orifice de mise à feu 124 et l'orifice d'assemblage 126 de l'embout d'initiation 120 sont alignés l'un avec l'autre selon la direction longitudinale de celui-ci, pour que l'on puisse introduire et faire coulisser la gaine souple contenant le cordeau détonant dans l'embout d'initiation 120 puis dans l'enveloppe, selon la direction longitudinale commune à l'embout d'initiation 120 et à l'enveloppe.- Finally, the tube loaded with the flexible sheath containing the detonating cord is deformed, to bring it into its first operating configuration in which it has a flattened shape over its entire length, by an appropriate deformation process, for example by a process pressing or other calibrated crushing process. The shape of the initiation tip 120 is conditioned by the manufacturing process which has just been recalled. For reasons of convenience, the introduction orifice is merged with the firing orifice 124. The firing orifice 124 and the assembly orifice 126 of the initiation nozzle 120 are aligned with each other in the longitudinal direction thereof, so that we can introduce and slide the flexible sheath containing the detonating cord in the initiation tip 120 and then in the envelope, according to the longitudinal direction common to the initiation tip 120 and to the casing.
L'orifice de mise à feu 124 sert donc à la fois à raccorder le cordon de mise à feu sur l'embout d'initiation 120, et à introduire la gaine souple contenant le cordeau détonant. Cette fonction d'introduction nécessite que l'embout d'initiation ait une certaine longueur, désignée par D à la figure 5, pour pouvoir guider la gaine souple .The firing orifice 124 therefore serves both to connect the firing cord to the initiation tip 120, and to introduce the flexible sheath containing the detonating cord. This introduction function requires that the initiation nozzle has a certain length, designated by D in FIG. 5, in order to be able to guide the flexible sheath.
Le raccordement entre l'embout d'initiation et le cordon de mise à feu, se fait sur une portion de raccordement, désignée par 140 à la figure 5, qui occupe une certaine longueur Dl, selon la direction longitudinale de l'embout d'initiation, qui augmente d'autant la longueur L, dans le plan de découpage, de l'ouverture 108 pratiquée dans ladite paroi 109 de l'un au moins des deux éléments d'engin qui doivent êtreThe connection between the initiation tip and the firing cord is made on a connection portion, designated by 140 in Figure 5, which occupies a certain length Dl, in the longitudinal direction of the tip initiation, which accordingly increases the length L, in the cutting plane, of the opening 108 made in said wall 109 of at least one of the two machine elements which must be
L'opération de déformation du tube se fait après son assemblage avec l'embout d'initiation, car sinon il ne serait pas possible, ou en tout cas très difficile, d'introduire la gaine souple contenant le cordeau détonant dans une enveloppe déjà aplatie. Il en résulte que le tube chargé présente une portion transitoire, désignée par 150 à la figure 5, le long de laquelle sa section passe progressivement d'une forme sensiblement circulaire, à proximité de l'embout d'initiation, à une forme sensiblement aplatie, là où il a été déformé. Cette portion transitoire 150 occupe une certaine longueur D2, qui augmente d'autant la longueur L, dans le plan de découpage, de l'ouverture 108 pratiquée dans ladite paroi 109 de l'un au moins des deux éléments d'engin.The tube deformation operation is done after its assembly with the initiation tip, because otherwise it would not be possible, or in any case very difficult, to introduce the flexible sheath containing the detonating cord into an already flattened envelope . As a result, the loaded tube has a transient portion, designated by 150 in FIG. 5, along which its section passes progressively in a substantially circular shape, near the end piece. initiation, to a substantially flattened shape, where it has been deformed. This transient portion 150 occupies a certain length D2, which consequently increases the length L, in the cutting plane, of the opening 108 made in said wall 109 of at least one of the two machine elements.
EXPOSÉ DE L'INVENTIONSTATEMENT OF THE INVENTION
Un but de la présente invention est d'obtenir un dispositif de séparation pyrotechnique qui conserve l'avantage principal du dispositif de séparation de l'art antérieur, à savoir permettre une séparation propre des éléments, c'est-à-dire que les résidus de matière explosive restent à l'intérieur du tube. En effet, l'un des deux éléments d'engin devant être séparés est très souvent un compartiment dans lequel se trouvent des équipements électroniques sophistiqués, fragiles et onéreux, qui ne doivent pas être pollués lors de la séparation des éléments.An object of the present invention is to obtain a pyrotechnic separation device which retains the main advantage of the separation device of the prior art, namely allowing a clean separation of the elements, that is to say that the residues explosive material remains inside the tube. Indeed, one of the two machine elements to be separated is very often a compartment in which there are sophisticated, fragile and expensive electronic equipment, which must not be polluted during the separation of the elements.
Un • autre but de la présente invention est de minimiser les contraintes sur les bords des ouvertures pratiquées dans la paroi de l'un au moins des éléments d'engin devant être séparés. Pour cela, il est nécessaire de réduire la longueur de ces ouvertures dans le plan de découpage. Pour cela., on cherche à diminuer la longueur D de chaque embout d' initiation et/ou la longueur Dl de la portion de raccordement associée, et/ou à diminuer la longueur D2 de la portion transitoire associée. • a further object of the present invention is to minimize the stresses on the edges of openings in the wall of the at least one machine component to be separated. For this, it is necessary to reduce the length of these openings in the cutting plane. To do this, we seek to reduce the length D of each initiation nozzle and / or the length D1 of the associated connection portion, and / or to reduce the length D2 of the associated transient portion.
Or ces trois longueurs D, Dl, D2 sont liées au procédé de fabrication du dispositif de séparation pyrotechnique de l'art antérieur, qui consiste à assembler un embout d'initiation rectiligne sur une enveloppe vide, puis à charger ladite enveloppe avec la gaine de matériau souple contenant le cordeau détonant par un orifice d'extrémité de l'embout d'initiation, puis à déformer le tube résultant, une fois qu'il a été chargé et raccordé .However, these three lengths D, Dl, D2 are linked to the process for manufacturing the pyrotechnic separation device of the prior art, which consists in assemble a straight initiation tip on an empty envelope, then load said envelope with the sheath of flexible material containing the detonating cord through an end orifice of the initiation tip, then deform the resulting tube, once that it has been loaded and connected.
Pour diminuer ces trois longueurs D, Dl, D2, une solution consiste à charger préalablement une enveloppe ayant une section transversale sensiblement circulaire avec la gaine souple contenant le cordeau détonant, puis à déformer le tube chargé pour conférer à sa section transversale une forme aplatie sur toute sa longueur, et enfin à assembler l'embout d'initiation sur une extrémité dudit tube chargé, par l'orifice d'assemblage de l'embout d'initiation. Par conséquent, l'orifice de mise à feu de l'embout d'initiation ne sert qu'à raccorder celui-ci avec le cordon de mise à feu, et ne sert plus à introduire la gaine souple contenant le cordeau détonant . II en résulte d'une part que la portion transitoire est supprimée, puisque la déformation du tube chargé se fait sur toute sa longueur. La longueur D2 peut ainsi être supprimée. Il en résulte d'autre part qu'il n'est plus nécessaire de placer l'orifice de mise à feu de manière à ce qu'il soit aligné avec l'orifice d'assemblage selon la direction longitudinale du tube chargé. La longueur Dl peut ainsi être supprimée. Il en résulte enfin que l'embout d'initiation peut être raccourci, et sa longueur D diminuée, puisqu'il n'a plus pour rôle de guider la gaine souple contenant le cordeau détonant pour son introduction dans 1 ' enveloppe .To reduce these three lengths D, Dl, D2, a solution consists in previously loading an envelope having a substantially circular cross section with the flexible sheath containing the detonating cord, then in deforming the loaded tube to give its cross section a flattened shape on its entire length, and finally to assemble the initiation nozzle on one end of said loaded tube, through the assembly orifice of the initiation nozzle. Consequently, the firing orifice of the initiation nozzle only serves to connect the latter with the firing cord, and no longer serves to introduce the flexible sheath containing the detonating cord. It follows on the one hand that the transient portion is eliminated, since the deformation of the loaded tube takes place over its entire length. The length D2 can thus be deleted. It follows on the other hand that it is no longer necessary to place the firing orifice so that it is aligned with the assembly orifice in the longitudinal direction of the loaded tube. The length D1 can thus be deleted. Finally, it follows that the initiation tip can be shortened, and its length D reduced, since it no longer has the role of guiding the flexible sheath containing the detonating cord for its introduction into the envelope.
La suppression de la portion transitoire a aussi pour avantage de réduire les coûts de fabrication du dispositif de séparation.The elimination of the transient portion also has the advantage of reducing the manufacturing costs of the separation device.
Un autre but de la présente invention est de garantir que l'assemblage entre le tube chargé et l'embout d'initiation assure de bonnes conditions d'étanchéité pour préserver le cordeau détonant de l'humidité de l'air ambiant.Another object of the present invention is to guarantee that the assembly between the loaded tube and the initiation nozzle ensures good sealing conditions to preserve the detonating cord from the humidity of the ambient air.
Par conséquent, pour la fabrication d'un dispositif de séparation pyrotechnique, on est confronté au double problème suivant : utiliser un tube préalablement chargé et ayant une section transversale préalablement aplatie, avant de l'assembler avec un embout d'initiation à au moins une de ses extrémités,Consequently, for the manufacture of a pyrotechnic separation device, we are confronted with the following double problem: using a tube previously loaded and having a cross-section previously flattened, before assembling it with a tip for initiating at least one from its ends,
- garantir l'étanchéité de cet assemblage entre l'embout d'initiation et ladite extrémité du tube préalablement chargé et préalablement déformé.- Guarantee the tightness of this assembly between the initiation nozzle and said end of the tube previously loaded and previously deformed.
Ce double problème peut être résolu au moyen d'un assemblage par soudage.This double problem can be solved by means of welding assembly.
Mais un problême dérivé survient alors .But then a derivative problem arises.
L' ëchauffement des pièces lors du soudage ne doit pas provoquer la mise à feu intempestive ou la destruction du cordeau détonant qui se trouve déjà à l'intérieur de l'enveloppe au moment de l'assemblage.The heating of the parts during welding must not cause inadvertent ignition or destruction of the detonating cord which is already inside the envelope at the time of assembly.
La présente invention propose donc un procédé d'assemblage d'un dispositif de séparation pyrotechnique par lequel on assemble directement au moins un embout d'initiation à une extrémité d'un tube préalablement chargé et déformé, ledit embout d'initiation ayant une dimension longitudinale réduite par rapport aux embouts d'initiation de l'art antérieur, et ledit procédé d'assemblage garantissant l'étanchéité de l'assemblage. Elle propose aussi un dispositif de séparation pyrotechnique obtenu par ce procédé .The present invention therefore provides a method of assembling a pyrotechnic separation device by which at least one initiation nozzle is directly assembled at one end of a tube. previously loaded and deformed, said initiation nozzle having a reduced longitudinal dimension compared to the initiation nozzles of the prior art, and said assembly method ensuring the tightness of the assembly. It also proposes a pyrotechnic separation device obtained by this process.
Selon un premier aspect de l'invention, le procédé d'assemblage d'un dispositif de séparation pyrotechnique comprend :According to a first aspect of the invention, the method of assembling a pyrotechnic separation device comprises:
- une étape au cours de laquelle on emboîte un tube chargé, comprenant une enveloppe contenant un cordeau détonant, dans un embout d'initiation,a step during which a loaded tube, comprising an envelope containing a detonating cord, is fitted into an initiation tip,
- une étape au cours de laquelle on solidarise ledit tube chargé et ledit embout d' initiation par soudage par fusion, en réalisant des points de soudure successifs qui se chevauchent de manière à former au moins un cordon de soudure périphérique, continu et fermé . De manière préférée, le procédé comprend une étape préalable au cours de laquelle on a déformé le tube chargé pour conférer à sa section transversale une forme aplatie sur toute sa longueur.- A step during which said loaded tube and said initiation tip are joined by fusion welding, by carrying out successive welding points which overlap so as to form at least one peripheral, continuous and closed weld bead. Preferably, the method comprises a prior step during which the loaded tube is deformed to give its cross section a flattened shape over its entire length.
De manière préférée, ladite section transversale aplatie a une forme oblongue ou ovale ou elliptique .Preferably, said flattened cross section has an oblong or oval or elliptical shape.
De manière préférée, le procédé comprend une étape initiale au cours de laquelle on a chargé une enveloppe ayant une section transversale de forme sensiblement circulaire avec un matériau souple et un cordeau détonant, ledit matériau souple formant une gaine pour ledit cordeau détonant .Preferably, the method comprises an initial step during which an envelope having a cross section of substantially circular shape is loaded with a flexible material and a detonating cord, said flexible material forming a sheath for said detonating cord.
Si le dispositif de séparation comporte plus d'un embout d'initiation, la succession des étapes ci- dessus mentionnées est renouvelée pour chaque assemblage d'un embout d'initiation avec une extrémité de tube préalablement chargé et déformé .If the separation device comprises more than one initiation nozzle, the succession of the above-mentioned steps is repeated for each assembly of an initiation nozzle with an end of tube previously loaded and deformed.
De préférence, ledit cordon de soudure est réalisé entre une zone périphérique amincie d'une paroi d'assemblage entourant un orifice d'assemblage de l'embout d'initiation et l'enveloppe. Lesdits points de soudure traversent la zone périphérique amincie de la paroi d'assemblage et pénètrent dans l'enveloppe sans la traverser. De préférence, ce soudage par points est effectué au moyen d'un appareil de soudage au laser de type laser YAG puisé . Ses paramètres de fonctionnement sont réglés de telle manière que l'élévation de température au niveau du cordeau détonant soit parfaitement maîtrisée.Preferably, said weld bead is produced between a thinned peripheral zone of an assembly wall surrounding an assembly orifice of the initiation nozzle and the envelope. Said welding points pass through the thinned peripheral zone of the assembly wall and penetrate into the envelope without passing through it. Preferably, this spot welding is carried out by means of a laser welding apparatus of the pulsed YAG laser type. Its operating parameters are adjusted in such a way that the temperature rise at the detonating cord is perfectly controlled.
Selon un deuxième aspect de l'invention, le dispositif de séparation pyrotechnique comprend au moins un tube chargé avec un cordeau détonant et au moins un embout d'initiation assemblé sur ledit tube chargé par la mise en œuvre d'un procédé d'assemblage conforme au premier aspect de l'invention.According to a second aspect of the invention, the pyrotechnic separation device comprises at least one tube loaded with a detonating cord and at least one initiation tip assembled on said charged tube by the implementation of a conforming assembly process to the first aspect of the invention.
De préférence, l'embout d'initiation est doté d'un orifice d'assemblage délimité par une paroi d'assemblage qui comporte une zone périphérique amincie . De préférence, l'embout d'initiation présente une forme coudée, formant par exemple sensiblement un angle droit.Preferably, the initiation nozzle is provided with an assembly orifice delimited by an assembly wall which comprises a thinned peripheral zone. Preferably, the initiation nozzle has a bent shape, for example forming substantially a right angle.
BRÈVE DESCRIPTION DES DESSINS D'autres caractéristiques et avantages du procédé d'assemblage et du dispositif de séparation pyrotechnique apparaîtront à la lecture de la description détaillée qui va suivre d'un exemple de réalisation de l'invention, fourni à titre purement illustratif et non limitatif, en référence aux dessins annexés dans lesquels :BRIEF DESCRIPTION OF THE DRAWINGS Other characteristics and advantages of the assembly process and of the pyrotechnic separation device will appear on reading the detailed description which follows of an embodiment of the invention, provided purely by way of illustration and not limiting, with reference to the accompanying drawings in which:
- la figure 1 est une vue en perspective d'une partie d'une zone de découpage entre deux éléments d'engin, montrant deux embouts d'initiation assemblés sur deux extrémités respectives mises bout à bout de deux tubes chargés d'un dispositif de séparation pyrotechnique ;- Figure 1 is a perspective view of part of a cutting area between two machine elements, showing two initiation tips assembled on two respective ends placed end to end of two tubes loaded with a device pyrotechnic separation;
- la figure 2 illustre en coupe longitudinale un embout d'initiation assemblé sur une extrémité d'un tube chargé d'un dispositif de séparation pyrotechnique ;- Figure 2 illustrates in longitudinal section an initiation nozzle assembled on one end of a tube loaded with a pyrotechnic separation device;
- la figure 3 est une vue partielle agrandie illustrant l'assemblage par soudage entre l'embout d'initiation et le tube chargé de la figure 2 ; et - la. figure 4 est une vue en gros plan d'un point de soudure permettant d'illustrer sa forme et ses dimensions ;- Figure 3 is an enlarged partial view illustrating the assembly by welding between the initiation tip and the loaded tube of Figure 2; and - the. Figure 4 is a close-up view of a welding spot to illustrate its shape and dimensions;
- la figure 5, déjà décrite, est une vue de dessus d'une partie d'une zone de découpage entre deux éléments d'engin, montrant deux embouts d'initiation assemblés sur deux extrémités mises bout à bout d'un tube chargé d'un dispositif de séparation pyrotechnique de l'art antérieur.- Figure 5, already described, is a top view of part of a cutting area between two machine elements, showing two initiation tips assembled on two ends put end to end of a tube loaded with a pyrotechnic separation device of the prior art.
EXPOSÉ DÉTAILLÉ D'UN MODE DE RÉALISATION PARTICULIERDETAILED DESCRIPTION OF A PARTICULAR EMBODIMENT
En se référant à la figure 1, un premier élément d'engin 2 et un deuxième élément d'engin 4 destinés à être séparés sont accolés l'un à l'autre le long d'une zone de découpage. La figure 1 illustre seulement une partie des deux éléments 2, 4, qui présentent chacun une forme globale de couronne sensiblement circulaire. Cette zone de découpage est parcourue par un logement périphérique 6 qui comprend, dans l'exemple illustré, une paroi 62 appartenant à l'élément d'engin 2 et une paroi 64 appartenant à l'élément d'engin 4. Ledit logement périphérique 6 reçoit . des dispositifs 10 de séparation pyrotechnique. Ceux-ci sont, dans le présent exemple, au nombre de deux et disposés bout à bout. Ils comprennent chacun un tube chargé 12 et deux embouts d'initiation 20. Du fait de la configuration sensiblement circulaire de la zone de découpage du présent exemple, celle-ci présente deux emplacements sensiblement diamétralement opposés, dans lesquels se trouvent deux embouts d'initiation 20 appartenant chacun à l'un des dispositifs de séparation 10. Au niveau de ces deux emplacements, l'élément d'engin 4 présente des ouvertures 8 destinées à loger les embouts d'initiation 10 et des cordons de mise à feu 80 (représentés par des traits discontinus à la figure 1) qui connectent les embouts d'initiation 20 à un dispositif de mise à feu (non représenté) , qui est éloigné de la zone de découpage . La figure 2 illustre, en coupe longitudinale, une extrémité d'un dispositif de séparation pyrotechnique 10, qui comprend un tube chargé 12 et un embout d'initiation 20. Le tube chargé 12 comprend une enveloppe métallique 13, de préférence en acier inoxydable. Il est équipé sur toute sa longueur d'un cordeau détonant 14 constituant une âme dudit tube chargé 12, et d'une gaine souple 16 qui remplit l'espace compris entre l'enveloppe 13 et le cordeau détonant 14. Le tube chargé 12 a été obtenu en introduisant dans l'enveloppe 13 un matériau souple contenant le cordeau détonant 1 , ledit matériau souple formant une gaine 16 pour ledit cordeau détonant 14. Ladite gaine souple 16 est réalisée en un matériau amortisseur, comme par exemple du silicone.Referring to FIG. 1, a first machine element 2 and a second machine element 4 intended to be separated are joined to one another along a cutting zone. FIG. 1 illustrates only part of the two elements 2, 4, which each have an overall shape of a substantially circular crown. This cutting area is traversed by a peripheral housing 6 which comprises, in the example illustrated, a wall 62 belonging to the machine element 2 and a wall 64 belonging to the machine element 4. Said peripheral housing 6 receives. pyrotechnic separation devices 10. These are, in this example, two in number and arranged end to end. They each include a loaded tube 12 and two initiation tips 20. Due to the substantially circular configuration of the cutting zone of the present example, it has two substantially diametrically opposite locations, in which there are two initiation tips. 20 each belonging to one of the separation devices 10. At these two locations, the machine element 4 has openings 8 intended to accommodate the initiation nozzles 10 and firing cords 80 (shown by broken lines in Figure 1) which connect the initiation tips 20 to a firing device (not shown), which is remote from the cutting area. FIG. 2 illustrates, in longitudinal section, one end of a pyrotechnic separation device 10, which comprises a charged tube 12 and an initiation nozzle 20. The charged tube 12 comprises a metal casing 13, preferably made of stainless steel. It is equipped over its entire length with a detonating cord 14 constituting a core of said charged tube 12, and with a flexible sheath 16 which fills the space between the casing 13 and the detonating cord 14. The charged tube 12 has was obtained by introducing into the envelope 13 a flexible material containing the detonating cord 1, said flexible material forming a sheath 16 for said detonating cord 14. Said flexible sheath 16 is made of a damping material, such as for example silicone.
Le tube chargé 12 a été préalablement déformé sur toute sa longueur. Il présente une section transversale de forme aplatie, par exemple oblongue, ovale ou elliptique. Une mise à feu du cordeau détonant provoquera une expansion radiale du tube chargé 12 qui tendra à adopter une configuration dans laquelle il présentera une section transversale sensiblement circulaire . L'embout d'initiation 20 est un embout métallique, de préférence en acier inoxydable affiné sous vide, qui présente une longueur D selon sa direction longitudinale qui est aussi la direction longitudinale du tube chargé 12. Il comprend : - un corps d'embout 22, un orifice de mise à feu 24 destiné au raccordement avec un cordon de mise à feu 80The loaded tube 12 has been previously deformed over its entire length. It has a flattened cross section, for example oblong, oval or elliptical. A firing of the detonating cord will cause a radial expansion of the loaded tube 12 which will tend to adopt a configuration in which it will have a substantially circular cross section. The initiation tip 20 is a metal tip, preferably made of stainless steel refined under vacuum, which has a length D along its longitudinal direction which is also the longitudinal direction of the loaded tube 12. It comprises: - a tip body 22 a firing orifice 24 intended for connection with a firing cord 80
(représenté par des traits discontinus à la figure 1) , qui est sur l'exemple illustré un raccordement de type vissé, et un orifice d'assemblage 26 pour son assemblage avec le tube chargé 12.(represented by broken lines in FIG. 1), which in the example illustrated is a screw-type connection, and an assembly orifice 26 for its assembly with the loaded tube 12.
Le corps d'embout 22 présente de préférence une forme coudée. L'orifice de mise à feu 24 et l'orifice d'assemblage 26 ont des axes qui se coupent en formant, dans l'exemple illustré, un angle sensiblement égal à 90°.The tip body 22 preferably has an angled shape. The firing orifice 24 and the assembly orifice 26 have axes which intersect, forming, in the example illustrated, an angle substantially equal to 90 °.
L'orifice d'assemblage 26 présente une section transversale dont la forme et les dimensions sont adaptées à celles de la section transversale de l'extrémité du tube chargé 12. Il est délimité par une paroi d'assemblage 28 qui fait partie du corps d'embout 22. La paroi d'assemblage 28 présente une zone périphérique amincie 30 et se termine par un anneau de renfort 32.The assembly orifice 26 has a cross section whose shape and dimensions are adapted to that of the cross section of the end of the loaded tube 12. It is delimited by an assembly wall 28 which is part of the body d end piece 22. The assembly wall 28 has a thinned peripheral zone 30 and ends in a reinforcing ring 32.
La zone périphérique amincie 30 est représentée à plus grande échelle à la figure 3, qui illustre l'assemblage proprement dit de l'embout d'initiation 20 sur le tube chargé 12. Le procédé d'assemblage du dispositif de séparation 10 comprend une étape d'emboîtement de l'extrémité du tube chargé 12 dans l'orifice d'assemblage 26, et une étape de solidarisation par soudage de la zone périphérique amincie 30 sur l'enveloppe aplatie 13. Ces deux étapes peuvent être précédées par une étape de chargement de l'enveloppe 13 avec le cordeau détonant 14 entouré de sa gaine souple 16, et/ou par une étape de déformation de la section transversale du tube chargé 12. Cette déformation est effectuée sur toute la longueur du tube chargé 12, et tend à aplatir sa section transversale, pour lui conférer une forme oblongue, ou ovale, ou elliptique, ou autre forme aplatie. Le soudage est un soudage par fusion de métal, qui est effectué au moyen d'un appareil de soudage au laser de type laser YAG puisé, dont on règle les paramètres de fonctionnement, de sorte que la température générée au niveau du cordeau détonant ne dépasse pas une valeur maximale TM. De préférence, cette valeur maximale TM est fixée à 100°C. Les principaux paramètres de fonctionnement sont la vitesse de soudage, l'énergie de soudage, la durée des impulsions, la fréquence des impulsions du faisceau laser, la focale de l'objectif, et la distance de tir.The thinned peripheral zone 30 is shown on a larger scale in FIG. 3, which illustrates the actual assembly of the initiation nozzle 20 on the loaded tube 12. The method of assembling the separation device 10 comprises a step for fitting the end of the loaded tube 12 into the assembly orifice 26, and a step of joining by welding the thinned peripheral zone 30 to the flattened envelope 13. These two steps can be preceded by a step of loading the envelope 13 with the detonating cord 14 surrounded by its flexible sheath 16, and / or by a step of deformation of the cross section of the loaded tube 12. This deformation is carried out on the entire length of the loaded tube 12, and tends to flatten its cross section, to give it an oblong, or oval, or elliptical, or other flattened shape. Welding is a fusion welding of metal, which is carried out by means of a laser welding machine of the pulsed YAG laser type, the operating parameters of which are adjusted, so that the temperature generated at the detonating cord does not exceed not a maximum value T M. Preferably, this maximum value T M is fixed at 100 ° C. The main operating parameters are the welding speed, the welding energy, the pulse duration, the pulse frequency of the laser beam, the focal length of the objective, and the shooting distance.
Le procédé de soudage influence le choix du matériau constitutif de l'embout d'initiation. En effet, un acier inoxydable affiné sous vide présente comme avantage, par rapport à un acier inoxydable qui ne serait pas affiné sous vide, une moindre sensibilité à la fissuration qui se produit parfois au cours d'un soudage au laser, du fait de la solidification rapide des zones fondues .The welding process influences the choice of material constituting the initiation tip. In fact, a vacuum-refined stainless steel has the advantage, compared to a stainless steel that would not be vacuum-refined, of a lower sensitivity to cracking which sometimes occurs during laser welding, due to the rapid solidification of molten areas.
L'étape de soudage consiste à réaliser des points de soudure 40 successifs sur la zone périphérique amincie 30, en faisant se chevaucher les points de soudure 40 le long de la périphérie de la zone périphérique amincie 30, de manière à former un ou plusieurs cordon (s) de soudage 42 périphérique (s) et continu (s) . De préférence, les points de soudure 40 d'un même cordon de soudure 42 sont régulièrement répartis sur la totalité de la circonférence de la zone périphérique amincie 30, de sorte que ledit cordon de soudure 42 est fermé. Comme on le voit distinctement sur la figure 3, les points de soudure 40 traversent la zone périphérique amincie 30 de la paroi d'assemblage 28, et pénètrent dans l'enveloppe 13 sans la traverser.The welding step consists in making successive welding points 40 on the thinned peripheral zone 30, by overlapping the weld points 40 along the periphery of the thinned peripheral zone 30, so as to form one or more weld bead (s) 42 peripheral (s) and continuous (s). Preferably, the weld points 40 of the same weld bead 42 are regularly distributed over the entire circumference of the thinned peripheral zone 30, so that said weld bead 42 is closed. As can be clearly seen in FIG. 3, the weld points 40 pass through the thinned peripheral zone 30 of the assembly wall 28, and penetrate into the envelope 13 without passing through it.
L'assemblage de l'embout d'initiation 20 sur 1 ' extrémité du tube chargé 12 est obtenu dès que 1 ' on a réalisé un cordon de soudure 42 périphérique et continu. Pour améliorer la tenue mécanique et l'étanchéité de l'assemblage, on préfère réaliser plusieurs cordons de soudure 42 périphériques et continus, qui sont sensiblement parallèles entre eux. Le nombre de cordons de soudure 42 est limité par la largeur de la zone périphérique amincie 30. Il est de préférence compris entre deux et six, et de manière encore plus préférée égal à quatre. Ladite largeur de la zone périphérique amincie est notée a.The assembly of the initiation nozzle 20 on one end of the loaded tube 12 is obtained as soon as one has produced a peripheral and continuous weld bead 42. To improve the mechanical strength and tightness of the assembly, it is preferred to produce several peripheral and continuous weld beads 42 which are substantially parallel to one another. The number of weld beads 42 is limited by the width of the thinned peripheral zone 30. It is preferably between two and six, and even more preferably equal to four. Said width of the thinned peripheral zone is noted a.
Selon une variante de réalisation, les cordons de soudure 42 sont espacés les uns des autres selon la direction de la largeur a de la zone périphérique amincie 30. Selon une autre variante préférée, illustrée à la figure 3, les cordons de soudure 42 sont jointifs selon la direction de la largeur a de la zone périphérique amincie 30.According to an alternative embodiment, the weld beads 42 are spaced from each other in the direction of the width a of the thinned peripheral zone 30. According to another preferred variant, illustrated in FIG. 3, the weld beads 42 are contiguous in the direction of the width a of the thinned peripheral zone 30.
La hauteur de la zone périphérique amincie est notée hl, la distance axiale entre deux cordons de soudure 42 adjacents est notée c, la distance entre chaque cordon de soudure 42 d'extrémité et chaque bord de la zone périphérique amincie 30 est notée b, et la largeur totale de soudage est notée 1.The height of the thinned peripheral zone is denoted hl, the axial distance between two adjacent weld beads 42 is denoted c, the distance between each end weld bead 42 and each edge of the thinned peripheral zone 30 is denoted b, and the total welding width is noted 1.
Sur la figure 4 est illustré en coupe et de manière agrandie un point de soudure 40. Il comporte une partie formant base 44 qui débouche à l'extérieur à la surface de la zone périphérique amincie 30, et une partie formant pied 46 qui pénètre dans l'enveloppe 13. La base 44 présente sensiblement une forme de dôme et le pied 46 présente sensiblement une forme cylindrique ou une forme tronconique s ' amenuisant en s ' éloignant de la base 44. L'extrémité du pied 46 pénétrant dans l'enveloppe 13 se termine par un bout 47 sensiblement arrondi . La surface de la base 44 qui débouche à l'extérieur présente un creux 45. La jonction entre la base 44 et le pied 46 présente sensiblement un profil en forme d'entonnoir. La base 44 présente un diamètre dl et son creux 45 présente une hauteur e. Le pied 46 présente un diamètre d2. Lorsque le pied 46 présente une forme sensiblement tronconique, son diamètre d2 est axialement variable. On désigne par d2p le diamètre d2 au niveau du plan de joint entre la zone périphérique amincie 30 et l'enveloppe 13. Le point de soudure 40 présente une hauteur totale h.2 qui est la somme d'une hauteur traversante hl égale à la hauteur de la zone périphérique amincie 30 traversée par les points de soudure 40 et d'une hauteur pénétrante h3 qui correspond à la hauteur de pénétration des points de soudure 40 dans l'enveloppe 13. Exemple On a utilisé un embout d' initiation 20 en acier inoxydable de type EZ2 CN 18-10, hypertrempé et affiné sous vide, comportant une paroi d'assemblage 28 ayant une zone périphérique amincie 30 d'une largeur a = 6,2 mm, et d'une hauteur hl = 0,95 mm. On a également utilisé une enveloppe cylindrique 13 en acier inoxydable de type Z2 CN 18-10, hypertrempé et non affiné sous vide.In Figure 4 is illustrated in section and in an enlarged manner a weld point 40. It has a base portion 44 which opens to the outside at the surface of the thinned peripheral zone 30, and a foot portion 46 which penetrates into the casing 13. The base 44 has substantially a dome shape and the foot 46 has substantially a cylindrical shape or a frustoconical shape which decreases as it moves away from the base 44. The end of the foot 46 penetrating into the casing 13 ends with a substantially rounded tip 47. The surface of the base 44 which opens to the outside has a recess 45. The junction between the base 44 and the foot 46 has a substantially funnel-shaped profile. The base 44 has a diameter dl and its hollow 45 has a height e. The foot 46 has a diameter d2. When the foot 46 has a substantially frustoconical shape, its diameter d2 is axially variable. We denote by d2p the diameter d2 at the joint plane between the thinned peripheral zone 30 and the envelope 13. The weld point 40 has a total height h.2 which is the sum of a through height hl equal to the height of the thinned peripheral zone 30 crossed by the points of weld 40 and a penetrating height h3 which corresponds to the penetration height of the weld points 40 in the casing 13. Example We used an initiation tip 20 made of stainless steel type EZ2 CN 18-10, hyper-soaked and vacuum-refined, comprising an assembly wall 28 having a thinned peripheral zone 30 with a width a = 6.2 mm and a height hl = 0.95 mm. A cylindrical casing 13 made of stainless steel type Z2 CN 18-10, hyperhardened and not refined under vacuum, was also used.
L'enveloppe 13 a été chargée avec une gaine de silicone 13 contenant un cordeau détonant 14. Le tube chargé ainsi formé a été écrasé pour avoir une section transversale de forme oblongue, avec deux parties droites et deux parties arrondies.The envelope 13 was loaded with a silicone sheath 13 containing a detonating cord 14. The loaded tube thus formed was crushed to have a cross section of oblong shape, with two straight parts and two rounded parts.
On a utilisé un procédé de soudage par laser YAG puisé, avec un centre de microsoudage connu sous la dénomination LASAG PM 300.A pulsed YAG laser welding process was used, with a microsoldering center known under the name LASAG PM 300.
On a réglé ses paramètres de fonctionnement de la manière suivante :We set its operating parameters as follows:
- vitesse de soudage sur les parties droites : 45 mi11imètres/minute - vitesse de soudage sur les parties arrondies : 540 degrés/minute- welding speed on the straight parts: 45 mi11imeters / minute - welding speed on the rounded parts: 540 degrees / minute
- énergie impulsionnelle : 18 joules- impulse energy: 18 joules
- durée des impulsions : 6 millisecondes- pulse duration: 6 milliseconds
- fréquence des impulsions : 3 hertz - focale de l'objectif : 150 millimètres- pulse frequency: 3 hertz - lens focal length: 150 millimeters
- distance de tir : 125,6 millimètres On a appliqué une protection gazeuse au moyen d'un flux d'azote ayant un débit de 10 litres/minute.- shooting distance: 125.6 millimeters A gas protection was applied by means of a flow of nitrogen having a flow rate of 10 liters / minute.
La température générée au niveau du cordeau détonant est restée inférieure à 80°C. On a réalisé des points de soudure 40 se chevauchant selon la direction périphérique de manière à former quatre cordons de soudure 42 périphériques, continus, et fermés. Les cordons de soudure 42 étaient jointifs. La distance axiale entre deux cordons de soudure 42 adjacents était c = 0,9 mm. La distance entre chaque cordon de soudure le plus extérieur et le bord correspondant de la zone périphérique amincie était b = 1,75 mm. La largeur totale de soudage était 1 = 4,2 mm. Les points de soudure 40 présentaient les dimensions suivantes :The temperature generated at the detonating cord remained below 80 ° C. Was welded points 40 overlapping in the peripheral direction so as to form four weld beads 42 peripheral, continuous, and closed. The weld beads 42 were joined. The axial distance between two adjacent weld beads 42 was c = 0.9 mm. The distance between each outermost weld bead and the corresponding edge of the thinned peripheral area was b = 1.75 mm. The total welding width was 1 = 4.2 mm. The weld points 40 had the following dimensions:
- hauteur totale : h.2 ≈ 1,2 à 1,4 mm,- total height: h.2 ≈ 1.2 to 1.4 mm,
- hauteur traversante : hl = 0,95 mm,- through height: hl = 0.95 mm,
- hauteur pénétrante : h.3 = h2 - hl = 0,25 à 0,45 mm, - diamètre de base : 1,2 mm < dl < 1,6 mm,- penetrating height: h.3 = h2 - hl = 0.25 to 0.45 mm, - base diameter: 1.2 mm <dl <1.6 mm,
- hauteur moyenne du creux dans la base : e < 0,2 mm,- average height of the hollow in the base: e <0.2 mm,
- diamètre de pied au niveau du plan de joint entre la zone périphérique amincie 30 et l'enveloppe 13 : d2p ≥ 0,4 mm. On a utilisé un embout d'initiation 20 dont la longueur D selon la direction longitudinale du tube chargé était sensiblement comprise entre 30 et 35 millimètres, plus précisément sensiblement égale à 32,7 millimètres, alors que selon l'art antérieur on aurait utilisé un embout d'initiation comportant un orifice de mise à feu et d'introduction axialement aligné avec l'orifice d'assemblage, et présentant une longueur D de 58,4 mm.- foot diameter at the joint plane between the thinned peripheral zone 30 and the casing 13: d2p ≥ 0.4 mm. An initiation nozzle 20 was used whose length D along the longitudinal direction of the loaded tube was substantially between 30 and 35 millimeters, more precisely substantially equal to 32.7 millimeters, whereas according to the prior art a initiation nozzle having a firing and introduction orifice axially aligned with the assembly orifice, and having a length D of 58.4 mm.
On a réduit la longueur L, dans le plan de découpage, de l'ouverture pratiquée dans la paroi de l'élément d'engin à 116 millimètres, alors qu'avec un dispositif de séparation de l'art antérieur, on aurait dû pratiquer une ouverture ayant une longueur L de 230 mm.The length L, in the cutting plane, of the opening made in the wall of the machine element has been reduced to 116 millimeters, whereas with a separation device of the prior art, we should have practiced an opening with a length L of 230 mm.
L'invention n'est pas limitée au mode de réalisation et à l'exemple qui viennent d'être décrits. Elle englobe des modifications et adaptations qui sont à la portée de l'homme du métier. The invention is not limited to the embodiment and to the example which have just been described. It includes modifications and adaptations which are within the reach of those skilled in the art.

Claims

REVENDICATIONS
1. Procédé d'assemblage d'un dispositif de séparation pyrotechnique (10), caractérisé en ce. qu'il comprend :1. Method for assembling a pyrotechnic separation device (10), characterized in that. that he understands:
- une étape au cours de laquelle on emboîte un tube chargé (12) , comprenant une enveloppe (13) contenant un cordeau détonant (14) , dans un embout d'initiation (20), - une étape au cours de laquelle on solidarise ledit tube préalablement chargé (12) et ledit embout d'initiation (20) par soudage par fusion, en réalisant des points de soudure (40) successifs qui se chevauchent de manière à former au moins un cordon de soudure (42) périphérique, continu, et fermé.- a step during which a loaded tube (12) is fitted, comprising an envelope (13) containing a detonating cord (14), in an initiation tip (20), - a step during which said interlock previously loaded tube (12) and said initiation tip (20) by fusion welding, producing successive weld points (40) which overlap so as to form at least one peripheral, continuous weld bead (42), and closed.
2. Procédé selon la revendication 1, caractérisé en ce qu'il comprend une étape préalable au cours de laquelle on déforme le tube chargé.2. Method according to claim 1, characterized in that it comprises a prior step during which the loaded tube is deformed.
3. Procédé selon la revendication 2, caractérisé en ce qu'on déforme le tube chargé (12) pour conférer à sa section transversale une forme aplatie sur toute sa longueur.3. Method according to claim 2, characterized in that the loaded tube is deformed (12) to give its cross section a flattened shape over its entire length.
4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit tube chargé (12) présente une section transversale ayant une forme oblongue ou ovale ou elliptique. 4. Method according to any one of claims 1 to 3, characterized in that said loaded tube (12) has a cross section having an oblong or oval or elliptical shape.
5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'il comprend une étape initiale au cours de laquelle on charge 1 ' enveloppe avec un matériau souple contenant le cordeau détonant de manière à former ledit tube chargé.5. Method according to any one of claims 1 to 4, characterized in that it comprises an initial stage during which the envelope is loaded with a flexible material containing the detonating cord so as to form said charged tube.
6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce que ledit cordon de soudure (42) est réalisé entre l'enveloppe (13) et une zone périphérique amincie (30) d'une paroi d'assemblage (28) entourant un orifice d'assemblage (26) de l'embout d'initiation (20).6. Method according to any one of claims 1 to 5, characterized in that said weld bead (42) is produced between the envelope (13) and a thinned peripheral zone (30) of an assembly wall ( 28) surrounding an assembly orifice (26) of the initiation nozzle (20).
7. Procédé selon la revendication 6, caractérisé en ce que les points de soudure (40) traversent la zone périphérique amincie (30) de la paroi d'assemblage (28) et pénètrent dans l'enveloppe (13) .7. Method according to claim 6, characterized in that the welding points (40) pass through the thinned peripheral zone (30) of the assembly wall (28) and penetrate into the envelope (13).
8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que l'on réalise des cordons de soudure (42) sensiblement parallèles, dont le nombre est compris entre deux et six.8. Method according to any one of claims 1 to 7, characterized in that one carries out weld beads (42) substantially parallel, the number of which is between two and six.
9. Procédé selon la revendication 8, caractérisé en ce que l'on réalise quatre cordons de soudure (42) .9. Method according to claim 8, characterized in that four weld beads are produced (42).
10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que lorsque l'on réalise plus d'un cordon de soudure (42), ces cordons de soudure (42) sont espacés les uns des autres .10. Method according to any one of claims 1 to 9, characterized in that when more than one weld seam (42) is produced, these weld seams (42) are spaced from one another.
11. Procédé selon l'une quelconque des revendications l à 9, caractérisé en ce que lorsque l'on réalise plus d'un cordon de soudure (42), ces cordons de soudure (42) sont jointifs.11. Method according to any one of claims l to 9, characterized in that when more than one weld bead (42) is produced, these weld beads (42) are contiguous.
12. Procédé selon l'une quelconque des revendications 1 à 11, caractérisé en ce que le soudage est réalisé au moyen d'un laser YAG puisé dont les paramètres de fonctionnement sont réglés de sorte que la température générée au niveau du cordeau détonant ne dépasse une valeur de température maximale (TM) .12. Method according to any one of claims 1 to 11, characterized in that the welding is carried out by means of a pulsed YAG laser whose operating parameters are adjusted so that the temperature generated at the detonating cord does not exceed a maximum temperature value (T M ).
13. Procédé selon la revendication 12, caractérisé en ce que l'on fixe la valeur de température maximale (TM) à 100° C.13. Method according to claim 12, characterized in that the maximum temperature value (T M ) is fixed at 100 ° C.
14. Dispositif de séparation pyrotechnique (10), comprenant un embout d'initiation (20) et un tube chargé (12) avec un cordeau détonant (14) , caractérisé en ce que ledit embout d'initiation (20) est assemblé sur ledit tube chargé (12) , par la mise en œuvre d'un procédé d'assemblage selon l'une quelconque des revendications 1 à 13.14. Pyrotechnic separation device (10), comprising an initiation tip (20) and a charged tube (12) with a detonating cord (14), characterized in that said initiation tip (20) is assembled on said loaded tube (12), by implementing an assembly method according to any one of claims 1 to 13.
15. Dispositif (10) selon la revendication 14, caractérisé en ce que le tube chargé (12) est formé d'une enveloppe (13) dans laquelle a été introduite une gaine souple (16) contenant le cordeau détonant (14) .15. Device (10) according to claim 14, characterized in that the loaded tube (12) is formed an envelope (13) into which has been introduced a flexible sheath (16) containing the detonating cord (14).
16. Dispositif (10) selon la revendication 14 ou 15, caractérisé en ce que ledit tube chargé (12) présente une section transversale ayant une forme aplatie.16. Device (10) according to claim 14 or 15, characterized in that said loaded tube (12) has a cross section having a flattened shape.
17. Dispositif (10) selon l'une quelconque des revendications 14 à 16, caractérisé en ce que ledit tube chargé (12) présente une section transversale ayant une forme oblongue ou ovale ou elliptique.17. Device (10) according to any one of claims 14 to 16, characterized in that said loaded tube (12) has a cross section having an oblong or oval or elliptical shape.
18. Dispositif (10) selon l'une quelconque des revendications 14 à 17, caractérisé en ce que l'enveloppe (13) et l'embout d'initiation (20) sont tous deux réalisés en acier inoxydable.18. Device (10) according to any one of claims 14 to 17, characterized in that the envelope (13) and the initiation nozzle (20) are both made of stainless steel.
19. Dispositif (10) selon l'une quelconque des revendications 14 à 18, caractérisé en ce que l'enveloppe (13) est réalisée en acier inoxydable de type Z2 CN 18-10, hypertrempé.19. Device (10) according to any one of claims 14 to 18, characterized in that the casing (13) is made of stainless steel type Z2 CN 18-10, hyperhardened.
20. Dispositif (10) selon l'une quelconque des revendications 14 à 19, caractérisé en ce que l'embout d'initiation (20) est réalisé en acier inoxydable affiné sous vide de type EZ2 CN 18-10, hypertrempé et affiné sous vide.20. Device (10) according to any one of claims 14 to 19, characterized in that the initiation nozzle (20) is made of vacuum-refined stainless steel of the EZ2 CN 18-10 type, hyper-quenched and refined under empty.
21. Dispositif (10) selon l'une quelconque des revendications 14 à 20, caractérisé en ce que l'embout d'initiation (20) est doté d'un orifice d'assemblage (26) entouré d'une paroi d'assemblage (28) qui comporte une zone périphérique amincie (30) .21. Device (10) according to any one of claims 14 to 20, characterized in that the end piece initiation (20) is provided with an assembly orifice (26) surrounded by an assembly wall (28) which has a thinned peripheral zone (30).
22. Dispositif (10) selon l'une quelconque des revendications 14 à 21, caractérisé en ce que l'embout d'initiation (20) présente une forme coudée. 22. Device (10) according to any one of claims 14 to 21, characterized in that the initiation nozzle (20) has a bent shape.
EP04705109A 2003-01-24 2004-01-26 Method of assembling a pyrotechnic separation device and pyrotechnic separation device thus obtained Expired - Lifetime EP1585933B1 (en)

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FR0300778A FR2850454B1 (en) 2003-01-24 2003-01-24 METHOD FOR ASSEMBLING A PYROTECHNIC SEPARATION DEVICE, AND PYROTECHNIC SEPARATION DEVICE OBTAINED THEREBY
PCT/FR2004/050032 WO2004068062A1 (en) 2003-01-24 2004-01-26 Method of assembling a pyrotechnic separation device and pyrotechnic separation device thus obtained

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Also Published As

Publication number Publication date
WO2004068062A1 (en) 2004-08-12
ES2268623T3 (en) 2007-03-16
FR2850454B1 (en) 2005-04-15
FR2850454A1 (en) 2004-07-30
EP1585933B1 (en) 2006-07-26

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