EP0773425A1 - Auskleidungsbefestigungsmittel für eine Hohlladung - Google Patents

Auskleidungsbefestigungsmittel für eine Hohlladung Download PDF

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Publication number
EP0773425A1
EP0773425A1 EP96402313A EP96402313A EP0773425A1 EP 0773425 A1 EP0773425 A1 EP 0773425A1 EP 96402313 A EP96402313 A EP 96402313A EP 96402313 A EP96402313 A EP 96402313A EP 0773425 A1 EP0773425 A1 EP 0773425A1
Authority
EP
European Patent Office
Prior art keywords
coating
washer
charge
holding device
vector
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
EP96402313A
Other languages
English (en)
French (fr)
Other versions
EP0773425B1 (de
Inventor
Pascal Laurend
Michel Vives
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.)
Giat Industries SA
Original Assignee
Giat Industries 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 Giat Industries SA filed Critical Giat Industries SA
Publication of EP0773425A1 publication Critical patent/EP0773425A1/de
Application granted granted Critical
Publication of EP0773425B1 publication Critical patent/EP0773425B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
    • F42B1/02—Shaped or hollow charges
    • F42B1/028—Shaped or hollow charges characterised by the form of the liner

Definitions

  • the technical field of the invention is that of devices for maintaining the coating of a core-generating charge and more particularly of a core-generating charge intended to be placed inside a vector, such as a shell. cargo ship, and to be ejected from it at a given time on the trajectory
  • the core-generating charges generally comprise an explosive charge placed in an envelope and to which a coating is applied having the overall shape of a spherical cap.
  • the coating is set in motion by the incident pressure wave. It deforms by turning over "like a thimble", that is to say it transforms into a projectile (or core) the front part of which is formed by the axial zone of the covering and the rear part is a formed skirt by the periphery of the coating.
  • Patent FR2627580 describes such a charge generating a nucleus.
  • the coating is usually attached to the explosive charge by gluing or it is immobilized relative to the envelope of the charge by means of a support integral with the envelope and placed in front of the coating.
  • the core-generating charges which are intended to be ejected from a vector are subjected to significant acceleration forces which can cause, a separation of the coating and of the loading, or at least a degradation of the coating, thus harming the subsequent formation of the nucleus.
  • the problem of the behavior of the coating acceleration is all the more complex as the charge is in principle subjected during the firing of the vector (such as an artillery shell) to a first acceleration, then knows during the ejection of the charge out of the vector a second acceleration having a direction opposite to that of the first.
  • the device according to the invention thus ensures excellent resistance of the coating of the load to the acceleration stresses which it undergoes inside the vector without causing disturbance to the formation of the core.
  • the subject of the invention is a device for maintaining a coating of a charge generating a core with respect to an envelope of said charge, a charge which is intended to be placed inside a vector, such as a cargo shell, and to be ejected out of this vector at a given time on the trajectory, device characterized in that it includes wedging means which ensure axial retention of the coating relative to the envelope of the load and which separate from it when ejected from the vector.
  • the wedging means are kept applied to the coating by a support means which is external to the charge and which is ejected from the vector at the same time as the latter.
  • the support means may be constituted by another load placed in the vector.
  • the wedging means will also be able to drive the coating in rotation.
  • the wedging means comprise a washer or an annular support which is supported on a peripheral zone of the covering.
  • This washer or this support can be divided into at least two parts which separate when the load is ejected from the vector.
  • the washer may include spring tabs, regularly distributed angularly and which are arranged so as to allow deformation by compression of the washer.
  • the spring tabs may have the form of arcs of a circle concentric with the washer.
  • the wedging means may comprise a cup kept applied to an external surface of the coating.
  • a sheet of compressible material may be placed between the coating and the cup.
  • a vector 1 which is here an artillery cargo shell, comprises an envelope 2, closed at one end by a base 3 and at the other end by a warhead 4.
  • the envelope 2 here contains two anti-tank submunitions 5a, 5b, which are held axially between the base 3 and a piston 6.
  • This shell is intended to eject the submunitions 5a and 5b at a given instant on the trajectory.
  • the ejection is controlled by a chronometric rocket 7, which initiates a gas generating charge 8.
  • the gas pressure pushes the piston which causes the separation of the base 3 and the casing 2 then the exit of the submunitions 5a, 5b out of the envelope.
  • Such a shell is known for example from patent FR2682754, which shows in particular the means allowing the rotation of the submunitions by the envelope as well as those allowing an adjustment of the axial clearance between the submunitions and the envelope ( means that are not shown here).
  • the submunitions 5a and 5b are charges which generate a nucleus. Each charge thus comprises an envelope 10 inside which is placed an explosive charge 9. A coating 11 is applied to the explosive charge 9.
  • the coating is kept applied axially to the explosive charge by wedging means which include an annular support 12.
  • This annular support is shown in more detail in Figures 2a and 2b. It has an external diameter less than or equal to the diameter of the casing 2 of the shell and on which a groove 13 is arranged intended to cooperate with a key (not shown) to ensure its drive in rotation by the casing 2.
  • the support 12 has a circular internal fold 14 which has a surface corresponding to the external surface of the covering 11. It also has a flat rear face 15 which is supported on the second load 5b and a flat rim 16 which comes to bear on the 'envelope 10 of the load 5a.
  • the support 12 is pinched between the two charges 5a and 5b. It then ensures axial retention of the coating 11 relative to the envelope 10 of the charge 5a (as well as an axial retention of the explosive charge 9 relative to the envelope 10).
  • the support is kept applied in this setting position of the covering by means of support which is formed by the second load 5b.
  • FIG. 1a represents this same cargo shell 1 at the time of ejection on the trajectory of the charges 5a, 5b.
  • the pressure of the gases generated by the gas-generating charge 8 separates the base 3 from the shell 2 of the shell and pushes in the direction indicated by the arrow F the stack of charges out of the shell 2.
  • the support 12 which is not integral with the charges 5a or 5b separates from them during ejection.
  • the core-generating load 5a then has the configuration, represented in FIG. 1a, in which no ring or obstacle is located in front of the coating 11.
  • This variant will give a certain elasticity to the connection, possibly making it possible to compensate for thermal expansions.
  • the coating of the load 5b is held axially by a similar support (not shown) disposed between the piston 6 and the load 5b.
  • FIG. 3a represents a second embodiment of the invention in which the coating 11 of the load 5a is held axially relative to the envelope 10 by wedging means constituted by a thin cup 17.
  • the cup 17 has a circular border 18 which is pinched between the two loads 5a, 5b and it has a convex profile which matches that of the external surface of the covering 11.
  • the cup will preferably be made of metal, for example steel or aluminum alloy.
  • the cup 17 separates from the coating 11 as well as the elastomer 19 which can advantageously be glued to the cup.
  • the core-generating charge of the submunition 5a therefore no longer includes any disruptive obstacle placed in front of its coating.
  • This embodiment makes it possible to distribute the acceleration forces relatively uniformly and over the entire external surface of the covering 11. It is particularly well suited to core-generating charges which use coverings of which the material is ductile or for which the formation of the core is disturbed by the presence of local stresses on the coating.
  • This embodiment also makes it possible to protect the external surface of the coating 11 from shocks or friction occurring at the time of ejection.
  • FIG. 3b shows an alternative embodiment in which the cup 17 is annular and therefore has an axial hole 20.
  • This embodiment makes it possible to give the cup increased elasticity (possibly making it possible to compensate for thermal expansions).
  • FIG. 4a shows a third embodiment of the invention in which the cup 17 does not have a circular edge 18 but a flat support crown 21.
  • a washer 22 is placed on this support ring and is interposed between the load 5b and the cup 17.
  • the wedging means therefore comprise the cup 17 and the washer 22, and these wedging means are kept applied to the covering 11 by a support means which is constituted by the load 5b.
  • the washer has a diameter slightly greater than that of the envelope 10 and is housed in a countersink 10a of the envelope.
  • the counterbore carries dishes intended to cooperate with the washer to ensure its drive in rotation.
  • the washer 22 is shown in more detail in Figures 4b and 4c. It is made of stamped spring steel sheet and it has spring tongues 23 (here four tongues), regularly angularly distributed, and which are supported on the crown 21 of the cup 17.
  • These spring tabs 23 have here the form of arcs of circles concentric with the washer 22 and they are obtained by cutting the washer.
  • the washer 22 also has three flats 24, regularly angularly distributed, which cooperate with the corresponding machining operations arranged on the casing 10 at the counterbore 10a. These flats make it possible to ensure the rotation drive of the washer 22 by the load 5a.
  • the washer 22 is deformable in compression and it makes it possible to make up for the axial clearances between the coating 11 and the casing 10, mainly the clearances due to thermal expansion.
  • the cup allows the stresses to be distributed over the entire external surface of the coating.
  • the washer 22 and the cup 17 separate from the charge 5a and therefore do not disturb the subsequent formation of the core.
  • the advantage of this embodiment is that it ensures excellent mechanical resistance to the acceleration of ejection of the charge while allowing thermal expansion in a very reliable and reproducible manner.
  • a washer 22 is preferably adopted such that, when the shell is rotated, the ends of the tongues 23 engage in the cup 17 (or in the coating). This ensures the rotational drive of the cup and / or of the coating by the washer 22 (itself driven in rotation by the casing 10 of the load).
  • the use of a cup protects the coating from the penetration of the tongues.
  • the washer must therefore be defined in such a way that the tongues come to bear on the cup and have an orientation such that the direction of rotation of the shell corresponds to an arc oriented from the base of the tongue towards its free end.
  • the elastic washer 22 may be replaced by a compressible elastomer washer.
  • Figures 5a and 5b show another alternative embodiment of the washer 22 in which the spring tabs 23 extend in a radial direction of the washer.
  • These tongues have a shape such that they come into contact with the concave surface of the cup 17.
  • the cup 17 and / or the washer 22 in several sectors, these sectors may be produced asymmetrically so as to promote their dispersal out of the shell.
  • Figure 6 shows for example a spring washer 22 made in four sectors 22a, 22b, 22c and 22d and Figure 7 shows a cup 17 made in three sectors 17a, 17b and 17c.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Portable Nailing Machines And Staplers (AREA)
EP19960402313 1995-11-13 1996-10-30 Auskleidungsbefestigungsmittel für eine Hohlladung Expired - Lifetime EP0773425B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9513379 1995-11-13
FR9513379A FR2741143B1 (fr) 1995-11-13 1995-11-13 Dispositif de maintien d'un revetement d'une charge generatrice de noyau

Publications (2)

Publication Number Publication Date
EP0773425A1 true EP0773425A1 (de) 1997-05-14
EP0773425B1 EP0773425B1 (de) 2000-05-17

Family

ID=9484475

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960402313 Expired - Lifetime EP0773425B1 (de) 1995-11-13 1996-10-30 Auskleidungsbefestigungsmittel für eine Hohlladung

Country Status (3)

Country Link
EP (1) EP0773425B1 (de)
DE (1) DE69608392T2 (de)
FR (1) FR2741143B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10520286B2 (en) * 2018-04-06 2019-12-31 Dynaenergetics Gmbh & Co. Kg Inlay for shaped charge and method of use

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11053782B2 (en) 2018-04-06 2021-07-06 DynaEnergetics Europe GmbH Perforating gun system and method of use

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071272A5 (en) * 1969-12-23 1971-09-17 Serat Parachute mine laying system - using mother projectile
FR2086531A5 (en) * 1970-04-01 1971-12-31 Clausin Pierre Plate charges - insulating screen
DE2046372A1 (en) * 1970-09-19 1972-03-23 Dynamit Nobel Ag, 5210 Troisdorf Hollow charge - with conical shaper kept in charge contact by springs and adhesive intermediate layer
DE3510402A1 (de) * 1985-03-22 1986-09-25 Diehl GmbH & Co, 8500 Nürnberg Stapelbare munition
DE3540021A1 (de) * 1985-11-12 1987-05-21 Messerschmitt Boelkow Blohm Mehrteilige hohlladungsauskleidung
DE2807309C1 (de) * 1978-02-21 1987-07-23 Messerschmitt Boelkow Blohm Sprengladung mit stachel- oder projektilbildenden Belegungen
DE3635361A1 (de) * 1986-10-17 1988-04-21 Diehl Gmbh & Co Artilleriegeschoss mit submunitionen
FR2627580A1 (fr) 1988-02-18 1989-08-25 France Etat Armement Procede permettant d'obtenir un noyau comportant des ailettes stabilisatrices et charge militaire faisant application
DE3933955A1 (de) * 1989-10-11 1991-04-18 Diehl Gmbh & Co Submunition mit einer hohlladung
FR2657156A1 (fr) 1990-01-16 1991-07-19 Rheinmetall Gmbh Bague de fixation pour la fixation axiale d'une garniture de formation de projectile.
FR2682754A1 (fr) 1991-10-22 1993-04-23 Giat Ind Sa Obus cargo.
EP0543072A1 (de) * 1991-07-01 1993-05-26 Bofors AB Projektilbildende explosive Ladung

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2071272A5 (en) * 1969-12-23 1971-09-17 Serat Parachute mine laying system - using mother projectile
FR2086531A5 (en) * 1970-04-01 1971-12-31 Clausin Pierre Plate charges - insulating screen
DE2046372A1 (en) * 1970-09-19 1972-03-23 Dynamit Nobel Ag, 5210 Troisdorf Hollow charge - with conical shaper kept in charge contact by springs and adhesive intermediate layer
DE2807309C1 (de) * 1978-02-21 1987-07-23 Messerschmitt Boelkow Blohm Sprengladung mit stachel- oder projektilbildenden Belegungen
DE3510402A1 (de) * 1985-03-22 1986-09-25 Diehl GmbH & Co, 8500 Nürnberg Stapelbare munition
DE3540021A1 (de) * 1985-11-12 1987-05-21 Messerschmitt Boelkow Blohm Mehrteilige hohlladungsauskleidung
DE3635361A1 (de) * 1986-10-17 1988-04-21 Diehl Gmbh & Co Artilleriegeschoss mit submunitionen
FR2627580A1 (fr) 1988-02-18 1989-08-25 France Etat Armement Procede permettant d'obtenir un noyau comportant des ailettes stabilisatrices et charge militaire faisant application
DE3933955A1 (de) * 1989-10-11 1991-04-18 Diehl Gmbh & Co Submunition mit einer hohlladung
FR2657156A1 (fr) 1990-01-16 1991-07-19 Rheinmetall Gmbh Bague de fixation pour la fixation axiale d'une garniture de formation de projectile.
EP0543072A1 (de) * 1991-07-01 1993-05-26 Bofors AB Projektilbildende explosive Ladung
FR2682754A1 (fr) 1991-10-22 1993-04-23 Giat Ind Sa Obus cargo.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10520286B2 (en) * 2018-04-06 2019-12-31 Dynaenergetics Gmbh & Co. Kg Inlay for shaped charge and method of use

Also Published As

Publication number Publication date
DE69608392T2 (de) 2000-09-21
FR2741143B1 (fr) 1998-01-02
DE69608392D1 (de) 2000-06-21
EP0773425B1 (de) 2000-05-17
FR2741143A1 (fr) 1997-05-16

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