EP2426455A1 - Verdichtungsverfahren für ein explosives Material in einem Projektilkörper und Werkzeug zur Umsetzung eines solchen Verfahrens - Google Patents

Verdichtungsverfahren für ein explosives Material in einem Projektilkörper und Werkzeug zur Umsetzung eines solchen Verfahrens Download PDF

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Publication number
EP2426455A1
EP2426455A1 EP11290343A EP11290343A EP2426455A1 EP 2426455 A1 EP2426455 A1 EP 2426455A1 EP 11290343 A EP11290343 A EP 11290343A EP 11290343 A EP11290343 A EP 11290343A EP 2426455 A1 EP2426455 A1 EP 2426455A1
Authority
EP
European Patent Office
Prior art keywords
guide
punch
compression
bead
head
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
EP11290343A
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English (en)
French (fr)
Other versions
EP2426455B1 (de
Inventor
Frédéric Carreau
François Lambert
Christophe Tripeau
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.)
Nexter Munitions SA
Original Assignee
Nexter Munitions 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 Nexter Munitions SA filed Critical Nexter Munitions SA
Publication of EP2426455A1 publication Critical patent/EP2426455A1/de
Application granted granted Critical
Publication of EP2426455B1 publication Critical patent/EP2426455B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F42B33/025—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges by compacting

Definitions

  • the technical field of the invention is that of methods for compressing explosive materials in the projectile bodies as well as tools associated with such processes.
  • casting is the preferred method.
  • the advantage of explosive compression processes is that they allow the projectiles to be loaded relatively quickly. Indeed, the explosive is set up by dosing the material in the powdered and non-liquid state and it is not necessary, when the compression is carried out at ambient temperature, to carry out heat treatments for cooling the load such as the usual casting processes impose it.
  • the explosive material in powder form is compressed by means of a compression punch directly into the projectile body and through a rear opening of this body.
  • the object of the invention is to propose a method, and the associated tooling, for compressively loading a projectile body or military head having one or more internal circular beads.
  • the subject of the invention is a method of compressing an explosive material in a projectile body or military head through a rear opening of this body, a method employing at least one compression punch, characterized in that the compression is carried out in several successive steps, each compression step being carried out by using a particular tooling associating a compression punch and a punch guide, guide interposed between the punch and the body, at minus a first punch guide having a defined length such that this guide can come into contact with an internal bead of the body or at least in the immediate vicinity of this bead, the internal diameter of the guide being less than or equal to the diameter of the bead .
  • the second guide may be disposed within the bore of the first guide.
  • the invention also relates to a tool for compressing an explosive material in a projectile body or military head through a rear opening of the body, a tool comprising a support for holding the body and at least one punch of compression mounted sliding relative to the support, tooling which is characterized in that it comprises at least one cylindrical guide for the sliding punch, guide interposed between the body and the punch, the guide having a length such that it can come into contact on an internal bead of the body or at least in the immediate vicinity of this bead, the inner diameter of the guide being less than or equal to the diameter of the bead.
  • This compression tooling may comprise a set of at least two punch guides of different lengths, the punch may also be equipped with at least two different compression heads.
  • the compression tool may comprise at least a second guide longer than the first guide and thus to guide a compression punch beyond the inner bead.
  • the second guide may be disposed within the bore of the first guide.
  • the punch head may include an end shoulder for scraping the inner surface of the guide.
  • the punch may also include at least one circular groove behind the head.
  • a compression tool 1 for an explosive material comprises a support 2 ensuring the maintenance of a body 3 of a projectile.
  • This support 2 is secured to a frame (not shown) of a compression machine.
  • the support 2 comprises a cylindrical bore 2a which receives the projectile body 3.
  • the bore 2a is extended by a concave surface 4 which has a shape complementary to that of the nose 3a of the body 3.
  • the body 3 is firmly maintained by the support 2, both radially and axially.
  • the support 2 is capped at its rear by a sleeve 5 to which it is fixed by screws or radial pins 6.
  • the sleeve has an internal counterbore 7 which constitutes a stop bearing against the rear 3b of the body 3 to level of the opening 8 of the latter.
  • the positioning holes of the pins 6 in the support 2 are arranged on the tool so that when placing these pins 6, the countersink 7 is actually in abutment against the rear 3b of the body.
  • the sleeve 5 has an axial bore 9 which has the same diameter as the internal bore 3c of the projectile body 3.
  • the axial bore 9 opens into an opening 10 of larger diameter and is threaded to receive a guide as will be described later.
  • the sleeve 5 finally carries radial vents 11 which allow the evacuation of air during the positioning of the sleeve 5 on the support 2.
  • the body 3 of the projectile has a particular internal profile which here comprises two circular beads 12a, 12b. These beads 12a, 12b are intended to strengthen the structure of the body 3 of the projectile. They oppose against the passage of a compression punch of the explosive which would be the internal diameter of the bore 3c of the body 3.
  • a cylindrical tubular guide 13 is disposed in the bore 9 of the sleeve 5. This guide slides when it is placed on the bore 3c of the body 3 of the projectile up to come into contact on the first bead 12a or at least in the immediate vicinity of this bead.
  • the internal diameter of the bore 13a of the guide 13 is less than or equal to the inner diameter (d) of the bead 12a (here substantially equal). Thus, when a punch 14 is slid inside the guide 13, this punch no longer interferes with the bead 12a.
  • the punch that slides inside the guide does not interfere with the bead and the length of the guide is sufficient to guide the punch during compression.
  • the end of the guide must also be as close as possible to the bead to limit the risk of introducing explosive between guide and bead during loading.
  • the guide 13 is secured to the support 2 by means of the sleeve 5 and is interposed between the body 3 of the projectile and the punch 14.
  • the guide 13 thus ensures the guiding of the punch 14 as usually done the body of the projectile when the latter is devoid of bulges. This avoids any risk of buckling of the punch and prevents the rise of the explosive material along the punch body 14.
  • the guide 13 comprises an enlarged rear head 15 which is threaded and is housed in the tapping 10 of the sleeve 5. It is thus ensured a rigid positioning of the guide 13 relative to the assembly formed by the support 2 and the sleeve 5.
  • Punch 14 is attached at its back to the compression machine (not shown). The latter exerts a force on the punch 14 and the head 16 of the punch 14 is then applied against the explosive charge (not shown in this example). figure 2 ) to achieve its compression in the body 3.
  • the head 16 of the punch 14 comprises a conical portion 16a which terminates in a spherical portion 16b.
  • the shape of the end of the head 16 of the punch is defined so as to ensure a transfer of the axial compression force along non-axial directions towards the wall of the body 3.
  • the compression force that the head 16 provides to the explosive material is oriented perpendicularly to the walls of the head 16.
  • the shape of the head 16 will therefore be chosen as a function of the maximum depth of penetration of the punch 14 inside the body 3 and in particular the distance maximum then separating the head 16 from the wall of the body 3.
  • the head 16 of the punch 14 has an end shoulder 16c in the form of a circular ring between the conical portion 16a and the cylindrical body of the punch 14.
  • This shoulder is a scraper for scraping the inner surface of the guide 13 during the advance of the punch. This scraping makes it possible to push towards the inside of the body 3 the explosive material which could be adhering to the inner wall 13a of the guide 13.
  • the punch 14 has a circular groove 17 behind the head 16. This groove 17 completes the scraper 16c and makes it possible to trap during the movement of the punch 14 the explosive material that may be on the inner cylindrical surface 13a of the guide 13.
  • the annular surfaces 17a and 17b delimiting the groove 17 are also scrapers which lead to the groove 17 the explosive material present on the cylindrical surface of the guide.
  • the figure 3a shows a first step of the method according to the invention.
  • the first guide 13.1 is chosen with a length such that it can come into contact with the first inner bead 12a of the body 3 (or at least in the immediate vicinity of this bead).
  • a first volume 18.1 of an explosive material in the powdery state is then placed at the bottom of the body 3 of the projectile.
  • the compressible explosives are well known to those skilled in the art.
  • the patent can be consulted FR2801883 which describes a compressible explosive. This explosive is introduced using a metering hopper (not shown) that is positioned in the guide 13.1.
  • a first punch 14.1 is then introduced into the guide 13.1. This punch is secured to a compression machine (not shown) which exerts on the punch 14.1 an effort F.
  • the head 16.1 of the punch 14.1 is then applied against the explosive charge to achieve its compression in the body 3.
  • a head 16.1 having a conical profile at acute apex angle was chosen.
  • the axial compression force F will be decomposed into compression forces along directions G perpendicular to the cone walls of the head 16.1.
  • the shape of the head 16.1 will thus ensure compression forces well distributed around the punch 14.1 and to the inner wall of the body 3.
  • the compressive force exerted on the first volume of explosive material 18.1 will also cause it to rise along the punch 14.1 to the first bead 12a (annular zone 18a).
  • the figure 3b shows a second step of the compression process according to the invention.
  • a second guide 13.2 which is fixed in the same way as the previous one to the sleeve 5 but which is shorter than the first guide and is therefore no longer in abutment against the first bead 12a.
  • This second guide is also the diameter of the bore of the body 3 and is therefore interposed between the punch 14.2 and the body 3.
  • a second punch 14.2 is used whose head 16.2 is different from the first head 16.1.
  • This head 16.2 has a conical portion having an obtuse apex angle.
  • the second volume of compressed explosive material 18.2 is less for this second compression step and the compression forces must then be distributed either to the nose 3a of the body 3 but rather to the upper interface 18.1a of the first volume of explosive 18.1 tablet.
  • the second head 16.2 comprises (just like the first head 16.1) an annular scraper 16c.
  • the figure 3c finally shows a third step of the method according to the invention.
  • This guide 13.3 is fixed in the same way as the two previous guides. It is also the diameter of the bore of the body 3 and is therefore interposed between a third punch 14.3 and the body 3.
  • the third punch 14.3 has a head 16.3 having a different profile.
  • the profile of the head 16.3 is spherical.
  • the bore of the body at the level of the third layer 18.3 of explosive material is indeed cylindrical without beads and the compression forces can be closer to the axial direction.
  • the profile of the head 16.3 of the punch 14.3 may change depending on the desired shape for the external surface of the explosive charge.
  • the guides 13.1, 13.2 and 13.3 make it possible to guiding the punches 14.1, 14.2 and 14.3 despite the presence of the beads.
  • the guides also allow to channel the explosive. No interference between the punch and the bead is to be feared because the guide diameter of the punch in the guide is less than or equal to the diameter (d) of the bead.
  • the lengths of the guides make it possible to progressively fill the body 3 of the projectile with the explosive.
  • figure 3a a method in which it is sufficient, during the first compression step, to position the first guide directly in contact (or in the immediate vicinity) with the first bead 12a. This is possible if the distance between the end of the head 16.1 of the punch 14.1 and the bottom of the body 3 is not too large relative to the internal diameter of the body 3 (distance between 1 and 2 times the size).
  • the figure 4 shows thus another embodiment of the tool according to the invention, wherein a second guide 13.1b is disposed within the bore of the first guide 13.1a.
  • the first guide comprises a tapping 19 arranged in the threaded rear head 15 of the first guide 13.1a.
  • the tapping 19 receives a threaded head 20 secured to the second guide 13.1b.
  • the tapping 19 receives a threaded head 20 secured to the second guide 13.1b.
  • the first guide 13.1a is positioned in contact (or in the immediate vicinity) with the first bead 12a. It has an internal bore whose diameter is equal to the inner diameter of the bead 12a.
  • the second guide 13.1b has an outer diameter equal to the inner diameter of the first guide 13.1a. This second guide 13.1b is longer than the first guide 13.1a and extends here beyond the second inner bead 12b of the projectile body 3.
  • the compression punch 14.1 is guided by the second guide 13.1b beyond the first inner bead 12a and also beyond the second inner bead 12b.
  • this second embodiment of the invention makes it possible to perform compressions in bodies of projectiles or military heads comprising a large number of beads and even adjacent beads of the front end of the body.
EP20110290343 2010-09-01 2011-07-28 Verdichtungsverfahren für ein explosives Material in einem Projektilkörper und Werkzeug zur Umsetzung eines solchen Verfahrens Active EP2426455B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1003503A FR2964188B1 (fr) 2010-09-01 2010-09-01 Procede de compression d'un materiau explosif dans un corps de projectile et outillage permettant la mise en oeuvre d'un tel procede

Publications (2)

Publication Number Publication Date
EP2426455A1 true EP2426455A1 (de) 2012-03-07
EP2426455B1 EP2426455B1 (de) 2014-12-17

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ID=43858010

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110290343 Active EP2426455B1 (de) 2010-09-01 2011-07-28 Verdichtungsverfahren für ein explosives Material in einem Projektilkörper und Werkzeug zur Umsetzung eines solchen Verfahrens

Country Status (3)

Country Link
EP (1) EP2426455B1 (de)
ES (1) ES2529772T3 (de)
FR (1) FR2964188B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108955426A (zh) * 2018-06-13 2018-12-07 河南北方红阳机电有限公司 一种带有深引信孔的薄壁壳体战斗部复合装药方法
CN117804292A (zh) * 2024-02-28 2024-04-02 南京尚景智造科技有限公司 一种火工品自动封装控制系统及方法
CN117804292B (en) * 2024-02-28 2024-04-30 南京尚景智造科技有限公司 Automatic packaging control system and method for initiating explosive device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113804067B (zh) * 2021-09-14 2023-05-09 四川航天川南火工技术有限公司 一种通用性火工药剂装压工装
CN113790640A (zh) * 2021-09-16 2021-12-14 太原师范学院 一种针对圆筒薄壁结构弹体的燃料压装模具及其使用方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE41318C (de) * W. LORENZ in Karlsruhe i. B Verfahren und Werkzeuge zum Comprimiren von Pulver oder anderen compressionsfähigen Stoffen in Hohlkörpern aller Art, wie Patronenhülsen, Rohren, Matrizen, Büchsen etc. in radialer, seitlicher oder schräger Richtung vom Innern der Hohlkörper aus nach der Wandung derselben hin
DE733070C (de) * 1940-11-17 1943-03-18 Rheinmetall Borsig Ag Vorrichtung zum Einpressen des Sprengstoffes in Geschosse
US2373799A (en) * 1942-11-04 1945-04-17 Frank C Wilson Bomb loading press
US2395898A (en) * 1943-08-13 1946-03-05 John C Mohr Pressing device
FR2801883A1 (fr) 1999-12-06 2001-06-08 Giat Ind Sa Composition explosive comprimable a vulnerabilite reduite et procede de preparation d'une telle composition

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE41318C (de) * W. LORENZ in Karlsruhe i. B Verfahren und Werkzeuge zum Comprimiren von Pulver oder anderen compressionsfähigen Stoffen in Hohlkörpern aller Art, wie Patronenhülsen, Rohren, Matrizen, Büchsen etc. in radialer, seitlicher oder schräger Richtung vom Innern der Hohlkörper aus nach der Wandung derselben hin
DE733070C (de) * 1940-11-17 1943-03-18 Rheinmetall Borsig Ag Vorrichtung zum Einpressen des Sprengstoffes in Geschosse
US2373799A (en) * 1942-11-04 1945-04-17 Frank C Wilson Bomb loading press
US2395898A (en) * 1943-08-13 1946-03-05 John C Mohr Pressing device
FR2801883A1 (fr) 1999-12-06 2001-06-08 Giat Ind Sa Composition explosive comprimable a vulnerabilite reduite et procede de preparation d'une telle composition

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108955426A (zh) * 2018-06-13 2018-12-07 河南北方红阳机电有限公司 一种带有深引信孔的薄壁壳体战斗部复合装药方法
CN108955426B (zh) * 2018-06-13 2020-11-17 河南北方红阳机电有限公司 一种带有深引信孔的薄壁壳体战斗部复合装药方法
CN117804292A (zh) * 2024-02-28 2024-04-02 南京尚景智造科技有限公司 一种火工品自动封装控制系统及方法
CN117804292B (en) * 2024-02-28 2024-04-30 南京尚景智造科技有限公司 Automatic packaging control system and method for initiating explosive device

Also Published As

Publication number Publication date
ES2529772T3 (es) 2015-02-25
EP2426455B1 (de) 2014-12-17
FR2964188B1 (fr) 2012-08-17
FR2964188A1 (fr) 2012-03-02

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