EP0519798B1 - Procédé de fabrication d'une charge explosive de grande puissance et dispositif de mise en oeuvre du procédé - Google Patents

Procédé de fabrication d'une charge explosive de grande puissance et dispositif de mise en oeuvre du procédé Download PDF

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Publication number
EP0519798B1
EP0519798B1 EP19920401657 EP92401657A EP0519798B1 EP 0519798 B1 EP0519798 B1 EP 0519798B1 EP 19920401657 EP19920401657 EP 19920401657 EP 92401657 A EP92401657 A EP 92401657A EP 0519798 B1 EP0519798 B1 EP 0519798B1
Authority
EP
European Patent Office
Prior art keywords
mould
mixture
filtering
mold
manufacturing process
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19920401657
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0519798A1 (fr
Inventor
André Espagnacq
Jean-Marie Lombard
Philippe Morand
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 EP0519798A1 publication Critical patent/EP0519798A1/fr
Application granted granted Critical
Publication of EP0519798B1 publication Critical patent/EP0519798B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/04—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams
    • B30B9/06—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using press rams co-operating with permeable casings or strainers
    • C—CHEMISTRY; METALLURGY
    • C06—EXPLOSIVES; MATCHES
    • C06B—EXPLOSIVES OR THERMIC COMPOSITIONS; MANUFACTURE THEREOF; USE OF SINGLE SUBSTANCES AS EXPLOSIVES
    • C06B21/00—Apparatus or methods for working-up explosives, e.g. forming, cutting, drying
    • C06B21/0033—Shaping the mixture
    • C06B21/005—By a process involving melting at least part of the ingredients
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B33/00—Manufacture of ammunition; Dismantling of ammunition; Apparatus therefor
    • F42B33/02—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges
    • F42B33/0207—Processes for loading or filling propulsive or explosive charges in containers

Definitions

  • the present invention relates to a process for manufacturing a high-powered explosive charge, of the type consisting in mixing a high-power explosive in the form of solid particles with a liquid or molten binder, in pouring the pasty mixture obtained into a mold, evacuate the excess liquid binder and then allow the mixture to solidify to form said explosive charge.
  • the field of application of the present invention is that of secondary explosives for charges, in particular explosives intended for hollow charges and for which charges are desired whose rate of high-powered explosive is very high, the very low degree of porosity and the smallest possible axial density gradient.
  • the industrial manufacture of hollow charges is preferably obtained by a casting method.
  • One such method consists in mixing high power explosives, for example hexogen and / or octogen, with an inert liquid constituent, for example a hardenable plastic resin, or an active one, for example molten TNT, the pasty mixture thus obtained being poured into the envelopes of hollow charges. Then the binder is allowed to harden.
  • the binder whether inert or active, inevitably constitutes a power reducer. The problem is therefore to reduce the rate of use of this binder as much as possible.
  • the object of the invention is to design a method and a device which make it possible to overcome the abovementioned drawbacks while providing other advantages.
  • the invention provides a method of manufacturing a high-powered explosive charge, of the aforementioned type and which is characterized in that it consists in removing the excess of liquid binder by filtration through porous walls of the mold, this filtration taking place substantially over the entire height thereof
  • the conventional method casting-compression is replaced by a casting-filtration process.
  • the evacuation of the excess of the liquid binder is carried out either by natural filtration, or by forced filtration by vibrating the mixture for a predetermined time, of the order of a few minutes.
  • the invention also provides a device for implementing this method, a device which is more particularly suitable when the binder used is a fusible product.
  • This device is characterized in that the mold has porous walls over substantially its entire height and in that it comprises means for cooling the mold which comprise a serpentine channel located inside a holding body. of the mold and connected by return pipes to a cooling device.
  • the bottom wall of the mold supports a conical block on which a coating of hollow charge rests.
  • the device will advantageously include means for cooling the coating of the hollow charge, these means comprising a serpentine-shaped channel housed inside the conical block and connected by return and return conduits to a cooling device.
  • the mold comprises a bottom wall bordered by a side wall open at its free end, each wall being formed by a rigid perforated grid and by at least one filtering envelope.
  • the filter envelope may be a metallic fabric, a plastic fabric, a fabric or a filter paper.
  • the wall of the mold may include at least one double filter envelope.
  • the mold is advantageously of cylindrical shape and has a bottom wall bordered by a side wall open at its free end, and it is removably attached to a holding support.
  • the holding support comprises a hollow body of cylindrical shape open at one end or upper end, and a receptacle into which opens the lower end of the body, the mold being housed in a removable manner inside this body by providing an annular space between the mold and the internal wall of the body for the free passage of the excess liquid binder which falls by gravity into the recovery receptacle.
  • the implementation device is equipped with complementary means capable of creating in the body of the support for holding a depression around the mold and / or an overpressure at the level of the surface of the mixture. , as well as a porous or unmounted piston sliding in order to exert a compressive force on the surface of the mixture.
  • the device 1 for implementing the method mainly comprises a mold 2 advantageously of cylindrical shape which has a bottom wall 3 bordered by a side wall 4 open at its free end and determined by a radially external rim 4a, and a support for holding 5 to which the mold 2 is fixed removably.
  • the bottom wall 3 and the side wall 4 of the mold 2 are porous walls which are constituted, with reference to FIGS. 1a and 1b, by a rigid support 6 such as sheet metal having perforations 6a each having an opening of the order of 10 mm, and by a filter envelope 7 which covers the interior wall of the mold 2.
  • This envelope 7 is constituted by a filtering material, for example, metallic fabric, plastic fabric or filter paper for example.
  • the casing 7 can be made up of two thicknesses 7a and 7b made up of different filtering materials.
  • the internal diameter of the mold 2 is slightly greater, of the order of 3 to 5 mm, than that of the filler that it is desired to obtain, and its height is sufficient to contain in addition to the filler , the extension which will then be removed by machining.
  • the mold 2 can advantageously be made in two parts in the form of two semi-cylindrical shells and / or flaring slightly at its upper part by delimiting a frustoconical shoulder 8 extended by the aforementioned radially external rim 4a.
  • Such a mold 2 is removably attached to the holding support 5 as described below with reference to FIG. 1.
  • the retaining support 5 comprises a cylindrical hollow body 9 where the mold 2 is housed, means 10 for fixing the mold 2 to the body 9, and a receptacle 11 into which the lower end of the body 9 opens.
  • the body 9 has, towards its end opposite to that opposite the receptacle 11, an internal wall which widens slightly outwards to form a frustoconical shoulder 9a of shape complementary to that of the shoulder 8 of the mold 2.
  • the internal diameter of the body 9 is greater than the external diameter of the mold 2, so that the mold 2 can be freely mounted inside the body 9 by delimiting between them an annular space E.
  • the mold 2 is retained in the body 9 by means of its shoulder 8 which bears on the complementary shoulder 9a of the body 9. In this position, the external rim 4a of the mold 2 bears on the upper end surface of the body 9, the rim 4a forming the mold retaining element 2 in the absence of the shoulders 8 and 9a.
  • the fastening means 10 of the mold 2 inside the body 9 consist of a ring 10a with a diameter substantially equal to that of the body 9.
  • This ring 10a is attached coaxially to the body 9, so as to come to bear on the rim 4a of the mold 2 to immobilize the latter, the ring 10a being itself fixed to the body 9 by any suitable means, known per se.
  • the receptacle 11 comprises a bottom wall 12 bordered by a lateral cylindrical wall 13 whose diameter is substantially equal to that of the body 9, and it forms a recovery chamber 14. This receptacle 11 once positioned under the body 9 is fixed to the latter by any suitable means known in oneself.
  • This device 1 makes it possible to manufacture a charge of explosive containing a high percentage of high-powered explosive according to the method according to the invention which takes place generally according to four main stages.
  • a mixture of high-power explosives is prepared, for example octogen and / or hexogen in the form of solid particles with a liquid binder such as molten TNT.
  • the pasty mixture which must then be able to be poured inside the mold 2 comprises of the order of 75% by weight of explosive and 25% by weight of TNT. Specific examples will be given later.
  • a third step, or filtration step the excess liquid binder in the mixture is evacuated naturally through the porous walls 3 and 4 of the mold 2 and is collected in the chamber 14 of the receptacle 11, after having passed through the filter envelope 7 and the perforations 6a of the perforated sheet 6 of the mold 2.
  • the duration of the filtration step is of the order of a few minutes, and in general, the mold 2 is kept at a temperature higher than that of the melting of the binder.
  • the mixture is allowed to solidify inside the mold 2, and the explosive charge is then removed from the mold.
  • the filtration operation takes place in a natural way.
  • the device 1 is equipped with vibrating means shown diagrammatically at 20 and which act directly on the holding support (5) of the mold 2.
  • These means can for example consist of a vibrating table on which the holding support 5 is fixed. .
  • a vacuum is created inside the space E provided between the mold 2 and the retaining body 5, so as to facilitate the filtration operation of the mixture contained in the mold 2.
  • a conduit 21 which is connected to a device 22 known per se which makes it possible to create this depression.
  • an overpressure is created at the level of the upper surface of the mixture contained in the mold 2 to also favor the filtration operation.
  • the implementation device is completed by a cover 25 which closes the upper end of the holding support 5 which then forms a closed enclosure.
  • a passage 26 is provided which communicates with a device 27, known per se, for sending pressurized air inside the holding body 5.
  • the mixture is slightly compressed always to facilitate the filtration operation of the excess liquid binder in the mixture contained in the mold 2.
  • This compression is ensured by means of a hollow piston 28 which is mounted sliding in the retaining body 5 and at the upper part thereof.
  • the piston 28 is hollow and its end surface adjacent to the mixture contained in the mold 2 is advantageously porous and constituted for example by a filtering wall 29 having the same constitution as the walls of the mold 2.
  • FIG. 5 shows an alternative embodiment of FIG. 4, in which the piston 28 is a full piston.
  • the step of solidifying the mixture, after natural or forced evacuation of the excess liquid binder, is accompanied by an operation of cooling the mixture.
  • This operation is advantageously carried out when the binder used is a fusible product, because it allows the shrinkage phenomenon to be limited to the upper part of the solidified block, part which is then eliminated.
  • this cooling operation there is provided in the holding support 5, a continuous channel 30 in the form of a serpentine which extends over the entire height of the mold 2.
  • This interior channel 30 opens out to the exterior. towards the lower and upper parts of the retaining body 5, and it communicates via outward and return conduits 32 with a cooling device 33, known per se, which circulates a coolant and comprises a circulation pump and an exchanger of heat for example.
  • Figure 7 is illustrated a variant of the embodiment of Figure 6 to improve the cooling operation of the mixture during solidification.
  • the bottom wall 3 of the mold 2 is pierced with a central opening 35 on which rests by the base a conical block 36 supporting the hollow charge coating 37.
  • a hollow charge consists of a metallic coating of conical shape onto which the explosive is poured.
  • the device for implementing the method according to the invention in the example considered in FIG. 7 includes this coating of hollow charge 37 supported by the block conical 36, so as to directly obtain a hollow charge after solidification of the mixture which sticks to the coating.
  • the solidified mixture once demolded when it is intended to constitute the explosive of a hollow charge, it must undergo a machining operation consisting in digging a conical recess in which the hollow charge coating is then bonded.
  • these other implementing devices can be equipped with these means 36 and 37 for manufacturing hollow charges.
  • a cooling circuit of the mixture which comprises by two circuits respectively external and internal.
  • the external circuit is similar to that shown in FIG. 6 with an internal channel 30 in the retaining body 5 which is connected by outward and return conduits 32 to a cooling device 33.
  • the internal cooling circuit comprises a continuous channel 40 in the form of a coil which is housed inside the conical block 36, channel 40 which is connected by outward and return conduits 42 to a cooling device 43 similar to the device 33.
  • the pasty mixture produced during the first step of the process initially contains 76% by weight of industrial quality octogen according to a particle size between 0 and 800 ⁇ m, and 24% of molten TNT.
  • the pasty mixture produced during the first step of the process contains 80% by weight of octogen according to a particle size between 0 and 1600 ⁇ m, and 20% by weight of molten TNT.
  • the pasty mixture produced during the first step of the process contains 83% by weight of octogen according to a particle size between 0 and 1000 ⁇ m and 17% by weight of molten TNT.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Materials (AREA)
EP19920401657 1991-06-21 1992-06-16 Procédé de fabrication d'une charge explosive de grande puissance et dispositif de mise en oeuvre du procédé Expired - Lifetime EP0519798B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9107606A FR2677977A1 (fr) 1991-06-21 1991-06-21 Procede de fabrication d'une charge explosive de grande puissance et dispositif de mise en óoeuvre du procede.
FR9107606 1991-06-21

Publications (2)

Publication Number Publication Date
EP0519798A1 EP0519798A1 (fr) 1992-12-23
EP0519798B1 true EP0519798B1 (fr) 1996-04-17

Family

ID=9414094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920401657 Expired - Lifetime EP0519798B1 (fr) 1991-06-21 1992-06-16 Procédé de fabrication d'une charge explosive de grande puissance et dispositif de mise en oeuvre du procédé

Country Status (3)

Country Link
EP (1) EP0519798B1 (enrdf_load_stackoverflow)
DE (1) DE69209905T2 (enrdf_load_stackoverflow)
FR (1) FR2677977A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2270181C1 (ru) * 2004-08-03 2006-02-20 ФГУП "Бийский олеумный завод" Состав литого взрывчатого вещества (варианты)
FR2954308B1 (fr) 2009-12-23 2012-02-24 Nexter Munitions Composition explosive fusible/coulable et a vulnerabilite reduite
CN109400425B (zh) * 2018-10-25 2020-12-08 山西北方兴安化学工业有限公司 一种包覆层反向浇铸模具
CN109485529B (zh) * 2018-10-31 2019-07-12 四川大学 一种用于发射药挤压机的药料均流装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1469114A (en) * 1921-11-14 1923-09-25 Simpson James Fruit press
FR52514E (fr) * 1942-07-24 1945-04-17 Procédé de traitement et de séchage de la tourbe
GB888858A (en) * 1951-08-15 1962-02-07 Hercules Powder Co Ltd Method and apparatus for manufacture of cast plastic compositions
US2800072A (en) * 1954-04-28 1957-07-23 American Viscose Corp Cylindrical press assembly
DE3529123C1 (en) * 1985-08-14 1987-04-23 Messerschmitt Boelkow Blohm Process and device for producing explosive charges
DE8904735U1 (de) * 1989-04-14 1989-06-01 Pettay, Franz, 8900 Augsburg Fruchtsaft-Filterpresse

Also Published As

Publication number Publication date
FR2677977A1 (fr) 1992-12-24
FR2677977B1 (enrdf_load_stackoverflow) 1994-07-13
DE69209905D1 (de) 1996-05-23
EP0519798A1 (fr) 1992-12-23
DE69209905T2 (de) 1996-09-05

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