EP1059505B1 - Metal cartridge case coated with an inner liner for preventing erosion - Google Patents
Metal cartridge case coated with an inner liner for preventing erosion Download PDFInfo
- Publication number
- EP1059505B1 EP1059505B1 EP00401523A EP00401523A EP1059505B1 EP 1059505 B1 EP1059505 B1 EP 1059505B1 EP 00401523 A EP00401523 A EP 00401523A EP 00401523 A EP00401523 A EP 00401523A EP 1059505 B1 EP1059505 B1 EP 1059505B1
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- EP
- European Patent Office
- Prior art keywords
- cartridge case
- sleeve
- combustible
- titanium oxide
- nitrocellulose
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
- F42B5/02—Cartridges, i.e. cases with charge and missile
- F42B5/24—Cartridges, i.e. cases with charge and missile for cleaning; for cooling; for lubricating ; for wear reducing
Definitions
- the present invention provides such a solution and primarily relates to a new socket metallic ammunition for firearms comprising a metal bottom and skirt, at least partially internally coated with a new anti-erosion additive comprising titanium oxide as an anti-erosion agent.
- This new socket is characterized in that the new anti-erosion add-on is a rigid sleeve made up of a combustible matrix loaded with powdery titanium oxide, in that the weight content of TiO 2 is between 10% and 30% relative to the total weight of the sleeve, limits included, and in that the combustible matrix comprises fibrous nitrocellulose, fibrous cellulose and an organic resin.
- the sleeve has a longitudinal slot or helical over its entire length so as to offer a certain radial elasticity facilitating its implementation place by the collar of the socket, as well as its positioning and holding it against the surface inside of the sleeve skirt.
- the combustible matrix is essentially consisting of fibrous nitrocellulose, of fibrous cellulose and organic resin, say that the sum of the weight contents in nitrocellulose, cellulose and resin is more than 95% with respect to the fuel matrix.
- fibrous nitrocellulose it is possible to use any industrial nitrocellulose with a nitrogen level less than 13.8%.
- the apparent density measured is 0.85 g / cm 3 .
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Paints Or Removers (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
- Manufacturing Of Micro-Capsules (AREA)
- Materials For Medical Uses (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
L'invention se situe dans le domaine des munitions pour armes à feu, notamment pour artillerie de gros calibre, et concerne plus particulièrement une nouvelle douille métallique de munition pour armes à feu destinée à contenir un chargement propulsif combustible ayant vocation à assurer la propulsion d'un projectile.The invention relates to the field of ammunition for firearms, in particular for wholesale artillery caliber, and relates more particularly to a new metal ammunition shell for firearms to contain a combustible propellant charge having vocation to ensure the propulsion of a projectile.
Le problème de l'usure et de l'érosion physique et/ou chimique des armes à feu provoquées par les frottements du projectile de la munition et des gaz chauds de combustion du chargement propulsif sur la paroi interne du tube des armes à feu est connu depuis très longtemps.The problem of wear and physical erosion and / or chemical firearms caused by ammunition and gas projectile friction propellant charge combustion hot on the inner wall of the gun tube has been known since long time.
Plusieurs solutions à ce problème ont déjà été proposées, mais aucune n'est vraiment satisfaisante, notamment parce que le coût est trop élevé et/ou l'efficacité insuffisante, et/ou parce que la solution engendre d'autres problèmes.Several solutions to this problem have already been proposed, but none is really satisfactory, in particular because the cost is too high and / or insufficient efficiency, and / or because the solution creates other problems.
Le brevet FR 1 526 983 enseigne par exemple qu'on
peut réduire l'érosion du tube de l'arme à feu en
revêtant la surface interne de la douille métallique
d'une enveloppe constituée d'un tissu enduit ou imprégné
d'une cire paraffinique chargée d'un ou plusieurs oxydes
métalliques en poudre, tels que SiO2, MgO, SnO2 et
TiO2.
Cette solution présente plusieurs inconvénients. Tout
d'abord, la cinétique de départ des charges, dépendante
de la température de ramollissement de la cire et de la
tenue du tissu, est mal maítrisée.
Elle présente aussi l'inconvénient d'un risque de
pollution de l'allumeur et de la poudre propulsive par
dépôt de particules d'oxydes métalliques arrachées de
leur support. En cas de sollicitations mécaniques
sévères de la munition, une telle pollution peut
conduire à l'inhibage des grains de poudre propulsive,
puis par suite provoquer un mauvais allumage (retard),
puis même l'éclatement du tube de l'arme.
De plus, l'efficacité anti-érosive est assez limitée par
rapport au niveau recherché par les utilisateurs
actuels, et on observe la présence de résidus dans le
tube de l'arme, ce qui provoque son encrassement.Patent FR 1,526,983 teaches, for example, that the erosion of the gun tube can be reduced by coating the internal surface of the metal casing with an envelope made of a fabric coated or impregnated with a wax. paraffinic charged with one or more powdered metal oxides, such as SiO 2 , MgO, SnO 2 and TiO 2 .
This solution has several drawbacks. First, the kinetics of charge departure, dependent on the softening temperature of the wax and the behavior of the fabric, is poorly controlled.
It also has the disadvantage of a risk of pollution of the igniter and of the propellant powder by depositing particles of metal oxides torn from their support. In the event of severe mechanical stresses on the ammunition, such pollution can lead to the inhibition of the propellant powder grains, then consequently cause poor ignition (delay), then even the bursting of the barrel of the weapon. In addition, the anti-erosion efficiency is quite limited compared to the level sought by current users, and we observe the presence of residues in the barrel of the weapon, which causes its fouling.
Le brevet US 3 148 620 enseigne qu'on peut résoudre le problème de pollution précité en interposant une feuille d'un matériau combustible entre la charge propulsive et le tissu anti-érosif, mais on constate alors une baisse importante de l'efficacité anti-érosive et l'appoint anti-érosif devient complexe et coûteux.US Patent 3,148,620 teaches that one can solve the aforementioned pollution problem by interposing a sheet of combustible material between the charge propellant and anti-erosive tissue but we find then a significant drop in anti-erosion efficiency and the anti-erosion additive becomes complex and costly.
L'homme du métier est donc toujours à la recherche d'une solution simple, efficace et peu onéreuse au problème précité de l'usure et de l'érosion du tube des armes à feu.The skilled person is therefore always looking a simple, effective and inexpensive solution to aforementioned problem of wear and erosion of the tube of the fire arms.
La présente invention propose une telle solution et a principalement pour objet une nouvelle douille métallique de munition pour armes à feu comprenant un fond et une jupe métalliques, au moins partiellement intérieurement revêtue d'un nouvel appoint anti-érosif comprenant de l'oxyde de titane comme agent anti-érosif.The present invention provides such a solution and primarily relates to a new socket metallic ammunition for firearms comprising a metal bottom and skirt, at least partially internally coated with a new anti-erosion additive comprising titanium oxide as an anti-erosion agent.
Cette nouvelle douille est caractérisée en ce que le nouvel appoint anti-érosif est un manchon rigide constitué d'une matrice combustible chargée en oxyde de titane pulvérulent, en ce que la teneur pondérale en TiO2 est comprise entre 10% et 30% par rapport au poids total du manchon, limites incluses, et en ce que la matrice combustible comprend de la nitrocellulose fibreuse, de la cellulose fibreuse et une résine organique. This new socket is characterized in that the new anti-erosion add-on is a rigid sleeve made up of a combustible matrix loaded with powdery titanium oxide, in that the weight content of TiO 2 is between 10% and 30% relative to the total weight of the sleeve, limits included, and in that the combustible matrix comprises fibrous nitrocellulose, fibrous cellulose and an organic resin.
On a constaté, de façon inattendue, qu'on obtenait
ainsi une excellente diffusion de la charge TiO2 dans
l'écoulement gazeux pendant le coup de feu ainsi qu'une
efficacité anti-érosive très supérieure, pouvant
atteindre un facteur 30, à celle observée en utilisant
la même quantité de TiO2 dans un tissu imprégné tel que
décrit dans l'état de la technique précité, alors que la
réalisation de ce manchon, et sa mise en place rapide et
sans collage dans la jupe de la douille, sont des
opérations simples et peu onéreuses.
De plus , on a constaté une excellente retenue de la
charge TiO2 par le matériau fibreux durant toutes les
phases de la vie de la munition, et il n'est pas
nécessaire d'interposer une protection entre le manchon
anti-érosif et le chargement propulsif pour éviter la
pollution du chargement. Cela représente un avantage
considérable concernant le compromis précité sécurité de
fonctionnement des munitions/efficacité de l'action
anti-érosive.
Par ailleurs, on a également noté l'absence de phénomène
d'encrassement du tube de l'arme, et même de la douille,
pendant le coup de feu.It has been found, unexpectedly, that an excellent diffusion of the TiO 2 charge is thus obtained in the gas flow during the shot as well as a very higher anti-erosive efficiency, which can reach a factor of 30, than that observed using the same amount of TiO 2 in an impregnated fabric as described in the aforementioned state of the art, while the production of this sleeve, and its rapid installation without gluing in the skirt of the sleeve, are simple and inexpensive operations.
In addition, an excellent retention of the TiO 2 charge by the fibrous material has been observed during all the phases of the life of the ammunition, and it is not necessary to interpose a protection between the anti-erosion sleeve and the charge. propellant to avoid pollution of the load. This represents a considerable advantage concerning the aforementioned compromise between the operational safety of ammunition and the effectiveness of the anti-erosion action.
In addition, it was also noted the absence of fouling phenomenon of the barrel of the weapon, and even of the case, during the shot.
La présente invention a également comme objet, d'une part le nouvel appoint anti-érosif précité, et d'autre part une nouvelle munition pour armes à feu comprenant la douille métallique précitée selon l'invention contenant un chargement propulsif combustible et munie d'une amorce et d'un projectile fixés à la douille de façon bien connue de l'homme du métier.The subject of the present invention is also, on the one hand, the aforementioned new anti-erosion supplement, and on the other hand a new ammunition for firearms comprising the aforementioned metal socket according to the invention containing a propellant charge combustible and equipped with a primer and a projectile attached to the socket in a manner well known to man of the job.
Le métal constituant la nouvelle douille selon l'invention et plus particulièrement le fond et la jupe, peut être tout métal ou alliage métallique habituellement utilisé pour confectionner des douilles métalliques, comme par exemple l'acier et le laiton.The metal constituting the new socket according to the invention and more particularly the bottom and the skirt, can be any metal or metal alloy usually used to make sockets metallic, such as steel and brass.
Selon l'invention, la douille est intérieurement
revêtue par le manchon anti-érosif, soit en totalité sur
toute la hauteur de la jupe, soit partiellement sur une
partie seulement de cette hauteur.
Par « revêtue », il faut comprendre que le manchon est
en contact total ou partiel avec l'intérieur de la jupe.
Le contact partiel peut être ponctuel, linéaire ou
surfacique. De façon générale, en cas de contact
partiel, celui-ci est matérialisé par plusieurs zones de
contact ponctuelles et/ou linéaires et/ou surfaciques.According to the invention, the sleeve is internally coated with the anti-erosion sleeve, either entirely over the entire height of the skirt, or partially over only part of this height.
By “coated”, it should be understood that the sleeve is in total or partial contact with the interior of the skirt. The partial contact can be punctual, linear or surface. Generally, in the event of partial contact, this is materialized by several point and / or linear and / or surface contact zones.
De façon générale encore, la forme du manchon
épouse celle de la douille. Le manchon peut par exemple
être cylindrique ou quasi cylindrique, tronconique, ou
comporter une partie cylindrique et une partie
tronconique.
Le manchon peut aussi être constitué par un empilage de
plusieurs tronçons.Still generally, the shape of the sleeve matches that of the socket. The sleeve can for example be cylindrical or almost cylindrical, frustoconical, or comprise a cylindrical part and a frustoconical part.
The sleeve can also consist of a stack of several sections.
De façon préférée, le manchon présente
extérieurement des cannelures longitudinales venant en
contact avec la surface intérieure de la jupe de la
douille. De telles zones de contact sont linéaires, ou
quasi linéaires, ou bien encore forment d'étroites
bandes longitudinales.
Une telle configuration crée, entre la paroi intérieure
de la jupe et le manchon, des conduits longitudinaux qui
favorisent la combustion de la matrice combustible du
manchon ainsi que l'écoulement de tous les gaz de
combustion du chargement propulsif et du manchon.Preferably, the sleeve externally has longitudinal grooves coming into contact with the internal surface of the skirt of the sleeve. Such contact zones are linear, or almost linear, or even form narrow longitudinal strips.
Such a configuration creates, between the interior wall of the skirt and the sleeve, longitudinal conduits which promote the combustion of the combustible matrix of the sleeve as well as the flow of all the combustion gases from the propellant charge and from the sleeve.
Selon une autre variante préférée de l'invention, le manchon présente une fente longitudinale ou hélicoïdale sur toute sa longueur de manière à offrir une certaine élasticité radiale facilitant sa mise en place par le collet de la douille, ainsi que son positionnement et son maintien contre la surface intérieure de la jupe de la douille.According to another preferred variant of the invention, the sleeve has a longitudinal slot or helical over its entire length so as to offer a certain radial elasticity facilitating its implementation place by the collar of the socket, as well as its positioning and holding it against the surface inside of the sleeve skirt.
Selon l'invention, le manchon rigide est constitué
d'une matrice combustible comprenant de la
nitrocellulose fibreuse, de la cellulose fibreuse et une
résine organique, chargée par du TiO2 pulvérulent.
La matrice combustible peut également comprendre
certains additifs, tels que des stabilisants comme la
diphénylamine.According to the invention, the rigid sleeve consists of a combustible matrix comprising fibrous nitrocellulose, fibrous cellulose and an organic resin, loaded with pulverulent TiO 2 .
The combustible matrix may also include certain additives, such as stabilizers such as diphenylamine.
De façon préférée, la matrice combustible est essentiellement constituée de nitrocellulose fibreuse, de cellulose fibreuse et de résine organique, c'est à dire que la somme des teneurs pondérales en nitrocellulose, cellulose et résine est supérieure à 95% par rapport à la matrice combustible.Preferably, the combustible matrix is essentially consisting of fibrous nitrocellulose, of fibrous cellulose and organic resin, say that the sum of the weight contents in nitrocellulose, cellulose and resin is more than 95% with respect to the fuel matrix.
La teneur en TiO2 est comprise entre 10% en poids et 30% en poids par rapport au poids total du manchon, limites incluses.The TiO 2 content is between 10% by weight and 30% by weight relative to the total weight of the sleeve, limits included.
La granulométrie du TiO2 peut être quelconque. Elle est par exemple de l'ordre de 50 µm.The particle size of the TiO 2 can be arbitrary. It is for example of the order of 50 μm.
Le manchon peut également comprendre d'autres charges que TiO2, notamment d'autres oxydes minéraux connus pour leur action anti-érosive.The sleeve may also include fillers other than TiO 2 , in particular other mineral oxides known for their anti-erosive action.
Comme cellulose fibreuse, on utilise de préférence des fibres de Kraft®, mais les autres fibres cellulosiques naturelles ou régénérées peuvent tout aussi bien convenir, y compris les fibres de pâte mécanique et les viscoses.As fibrous cellulose, preferably used Kraft® fibers, but other fibers natural or regenerated cellulosics can all also suitable, including pulp fibers mechanics and viscoses.
Comme nitrocellulose fibreuse, on peut utiliser toute nitrocellulose industrielle ayant un taux d'azote inférieur à 13,8%.As fibrous nitrocellulose, it is possible to use any industrial nitrocellulose with a nitrogen level less than 13.8%.
Comme résine organique, on peut utiliser toute résine ou mélange de résines ayant la propriété de floculer sur les fibres de nitrocellulose ou de cellulose.As organic resin, any resin or mixture of resins having the property of flocculate on nitrocellulose fibers or cellulose.
Les résines préférées selon l'invention sont les résines acryliques, les résines vinyliques, les latex à base de butadiène comme les latex butadiène styrène ou butadiène acrylonitrile.The preferred resins according to the invention are the acrylic resins, vinyl resins, latexes butadiene base such as styrene butadiene latex or butadiene acrylonitrile.
Les rapports des différents constituants du manchon peuvent varier dans de grandes proportions.The reports of the different components of the sleeve can vary widely.
Il faut néanmoins une quantité minimale de résine pour permettre une agglomération suffisante des fibres, et on a observé qu'il est nécessaire que la quantité pondérale de résine représente au moins 2% de la quantité pondérale de nitrocellulose et de cellulose utilisée. On utilisera de préférence une quantité pondérale comprise entre 5% et 15%, par exemple voisine de 10%.However, a minimum quantity of resin is required. to allow sufficient agglomeration of the fibers, and it has been observed that it is necessary that the quantity resin weight represents at least 2% of the weight amount of nitrocellulose and cellulose used. We will preferably use a quantity weight between 5% and 15%, for example close 10%.
Le rapport pondéral nitrocellulose/cellulose peut varier entre 8 et 1/8, de préférence entre 8 et 1/2.The nitrocellulose / cellulose weight ratio can vary between 8 and 1/8, preferably between 8 and 1/2.
Le manchon rigide peut être obtenu selon les techniques bien connues de l'homme du métier à partir d'une suspension aqueuse des divers constituants, par exemple par feutrage. The rigid sleeve can be obtained according to techniques well known to those skilled in the art from of an aqueous suspension of the various constituents, for example by felting.
Ses dimensions sont adaptées à celles de la douille, de façon à pouvoir revêtir la paroi interne de la douille après introduction.Its dimensions are adapted to those of the socket, so as to be able to coat the inner wall of the socket after introduction.
L'exemple non limitatif suivant illustre l'invention et les avantages qu'elle procure.The following nonlimiting example illustrates the invention and the advantages it provides.
Dans une suspension aqueuse constituée de 97,6 parties en poids de fibres de Kraft, de 248 parties en poids de nitrocellulose ayant un taux d'azote de 13,4% et de 9600 parties en poids d'eau, on ajoute 96 parties en poids de TiO2 ayant un diamètre médian de 44 µm, 33,6 parties en poids d'une résine acrylique de type polyacrylate de méthyle et d'éthyle et 4,8 parties en poids de diphénylamine.In an aqueous suspension consisting of 97.6 parts by weight of Kraft fibers, 248 parts by weight of nitrocellulose having a nitrogen content of 13.4% and 9600 parts by weight of water, 96 parts are added. weight of TiO 2 having a median diameter of 44 μm, 33.6 parts by weight of an acrylic resin of the poly (methyl ethyl ethyl acrylate) type and 4.8 parts by weight of diphenylamine.
Après obtention d'un mélange homogène, on réalise, selon la technique de feutrage bien connue de l'homme du métier, 2 tronçons de manchon, de longueur 185 mm, de diamètre extérieur 122 mm et d'épaisseur 4 mm, ayant chacun une masse de 240 g.After obtaining a homogeneous mixture, we realizes, according to the well-known felting technique of the skilled person, 2 sections of sleeve, length 185 mm, outside diameter 122 mm and thickness 4 mm, each having a mass of 240 g.
La masse volumique apparente mesurée est de 0,85 g/cm3.The apparent density measured is 0.85 g / cm 3 .
Les propriétés mécaniques, et de combustion en
bombe manométrique mesurées à la densité de chargement
de 0,1 g/ cm3, sont les suivantes :
Après avoir fendu longitudinalement chacun des 2 tronçons de manchon réalisés en a), on les roule légèrement sur eux-mêmes de façon à permettre leur introduction par le collet d'une douille en laiton de type 105F4 comportant un culot et une jupe approximativement cylindrique de longueur 607 mm. After having split longitudinally each of the 2 sleeve sections made in a), they are rolled slightly on themselves so as to allow their introduction by the collar of a brass socket of type 105F4 with a base and a skirt approximately cylindrical, length 607 mm.
Les diamètres intérieur et extérieur du collet sont respectivement 104 mm et 107 mm.The inside and outside diameters of the collar are 104 mm and 107 mm respectively.
La jupe comporte une partie cylindrique de diamètre intérieur 122 mm et de longueur environ 400 mm, ainsi qu'une partie tronconique faisant liaison entre cette partie cylindrique et le collet.The skirt has a cylindrical part of internal diameter 122 mm and length approximately 400 mm, as well as a frustoconical part connecting this cylindrical part and the collar.
Après pénétration successive des 2 tronçons de manchon dans la douille par son collet, puis relâchement, on les enfonce jusqu'à ce qu'ils soient empilés et revêtent intérieurement la partie cylindrique de la jupe.After successive penetration of the 2 sections of sleeve in the socket by its collar, then loosening, we push them until they are stacked and internally lining the cylindrical part of the skirt.
On a obtenu une cartouche en positionnant une amorce de type TPA 27 x 320 bien connue de l'homme du métier au niveau du culot de la douille, puis en remplissant la douille par 5,6 kg d'une charge propulsive constituée d'une poudre double base nitrocellulose/nitroglycérine de type GB 19 T (1,65) GR également bien connue de l'homme du métier.We obtained a cartridge by positioning a TPA type primer 27 x 320 well known to those skilled in the art loom at the socket base, then in filling the socket with 5.6 kg of a charge propellant consisting of a double base powder nitrocellulose / nitroglycerin type GB 19 T (1.65) GR also well known to those skilled in the art.
On a ensuite obtenu une munition en positionnant par le collet de la cartouche, de façon bien connue de l'homme du métier, un projectile de type boulet empenné OFL 105 de 5,8 kg, lesté à 6,25 kg.We then obtained ammunition by positioning by the collar of the cartridge, in a well known manner from a person skilled in the art, a feathered ball type projectile OFL 105 of 5.8 kg, weighted at 6.25 kg.
L'évaluation en arme (canon de type 105 F1) de 20 munitions identiques obtenues comme selon b) a permis de constater une usure du tube de l'arme de 0,5 µm par coup, mesurée après les 20 coups à l'aide d'une étoile de métrologie de façon bien connue de l'homme du métier. The weapon assessment (105 F1 type gun) of 20 identical munitions obtained as per b) allowed to note a wear of the barrel of 0.5 µm by shot, measured after 20 shots with a star of metrology in a manner well known to those skilled in the art.
Lors de ces tirs, la vitesse initiale mesurée du projectile est de 1527 m/s et les pressions maximales, respectivement mesurées à 110 mm et 508 mm de la culasse, sont de 405 MPa et 387 MPa (valeurs moyennes). On note par ailleurs l'absence d'encrassement du tube et même de la douille pendant le coup de feu.During these shots, the initial measured speed of the projectile is 1527 m / s and the maximum pressures, respectively measured at 110 mm and 508 mm from the cylinder head, are 405 MPa and 387 MPa (average values). We also note the absence of fouling of the tube and even from the socket during the shot.
Parallèlement à cet exemple selon l'invention, on a réalisé deux exemples comparatifs, ne faisant pas partie de l'invention, afin de bien mettre en évidence le problème résolu par l'invention et les avantages qu'elle procure.In parallel with this example according to the invention, we carried out two comparative examples, not part of the invention, in order to highlight the problem solved by the invention and the advantages that it provides.
Selon le premier exemple comparatif, on a réalisé 20 munitions identiques ne se différenciant de la munition précitée selon l'invention que par l'appoint anti-érosif utilisé, à savoir, l'utilisation, au lieu du manchon rigide réalisé selon a), d'un appoint de 182 g bien connu de l'homme du métier, correspondant à l'état de la technique selon FR 1 526 983 précité, constitué de 53% en poids de TiO2 et de 47% en poids de cire et tissu support.According to the first comparative example, 20 identical munitions were produced, differing from the above-mentioned ammunition according to the invention only by the anti-erosion additive used, namely, the use, instead of the rigid sleeve produced according to a), an addition of 182 g well known to those skilled in the art, corresponding to the state of the art according to the above-mentioned FR 1 526 983, consisting of 53% by weight of TiO 2 and 47% by weight of wax and fabric support.
On notera que la quantité de TiO2 est identique (96 g) à celle utilisée selon l'invention.Note that the amount of TiO 2 is identical (96 g) to that used according to the invention.
L'évaluation en arme, dans les mêmes conditions expérimentales qu'en c) selon l'invention, a permis de constater une usure du tube de l'arme de 7 µm par coup, à savoir une usure 14 fois supérieure à celle constatée avec les munitions selon l'invention.Weapon evaluation, under the same conditions that in c) according to the invention, allowed to note a 7 µm barrel wear per shot, namely wear 14 times greater than that observed with the ammunition according to the invention.
Selon le second exemple comparatif, on a utilisé le même appoint de 182 g que celui utilisé selon le premier exemple comparatif, mais comprenant en outre une feuille de protection pour éviter la pollution du chargement, comme cela est enseigné par US 3 148 620 précité dans l'état de la technique.According to the second comparative example, we used the same supplement of 182 g as that used according to the first comparative example, but further comprising a protective sheet to avoid pollution of the loading, as taught by US 3,148,620 cited above in the state of the art.
L'évaluation en arme, dans les mêmes conditions expérimentales qu'en c) selon l'invention, a permis de constater une usure du tube de l'arme de 14 µm par coup, à savoir une usure 28 fois supérieure à celle constatée avec les munitions selon l'invention.Weapon evaluation, under the same conditions that in c) according to the invention, allowed to note a 14 µm weapon tube wear per shot, namely wear 28 times greater than that observed with the ammunition according to the invention.
Claims (9)
- Metal ammunition cartridge case for firearms at least partially coated internally with an anti-erosion auxiliary comprising powdered titanium oxide, characterized in that the anti-erosion auxiliary is a rigid sleeve consisting of a combustible matrix filled with titanium oxide, in that the concentration by weight of titanium oxide lies between 10% and 30% based on the total weight of the sleeve, and in that the combustible matrix comprises fibrous nitrocellulose, fibrous cellulose and an organic resin.
- Metal cartridge case according to claim 1, characterized in that the combustible matrix consists substantially of fibrous nitrocellulose, fibrous cellulose and organic resin.
- Metal cartridge case according to claim 1, characterized in that the weight ratio of resin/nitrocellulose + cellulose lies between 0.05 and 0.15 and in that the weight ratio of nitrocellulose/cellulose lies between 8 and 1/2.
- Metal cartridge case according to claim 1, characterized in that the organic resin is chosen from the group consisting of acrylic resins, vinyl resins, butadiene-based latex and mixtures thereof.
- Metal cartridge case according to claim 1, characterized in that the sleeve has external longitudinal splines coming into contact with the internal surface of the skirt of the cartridge case.
- Metal cartridge case according to claim 1, characterized in that the sleeve has a longitudinal or helical slit over all its length.
- Metal cartridge case according to claim 1, characterized in that the sleeve consists of a stack of several sections.
- Ammunition for firearms comprising a metal cartridge case provided with a detonator and a projectile, and containing a combustible propellant charge, characterized in that the cartridge case is a cartridge case according to any one of claims 1 to 7.
- Anti-erosion auxiliary designed for internally coating a metal cartridge case of ammunition for firearms, characterized in that this auxiliary is a rigid sleeve consisting of a combustible matrix filled with titanium oxide, in that the concentration by weight of titanium oxide lies between 10% and 30% based on the total weight of the sleeve, and in that the combustible matrix comprises fibrous nitrocellulose, fibrous cellulose and an organic resin.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9907219A FR2794854B1 (en) | 1999-06-08 | 1999-06-08 | METAL AMMUNITION SOCKET FOR INTERIOR FIREARMS COATED WITH AN ANTI-EROSIVE SLEEVE |
| FR9907219 | 1999-06-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1059505A1 EP1059505A1 (en) | 2000-12-13 |
| EP1059505B1 true EP1059505B1 (en) | 2004-01-21 |
Family
ID=9546519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00401523A Expired - Lifetime EP1059505B1 (en) | 1999-06-08 | 2000-05-30 | Metal cartridge case coated with an inner liner for preventing erosion |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1059505B1 (en) |
| AT (1) | ATE258305T1 (en) |
| DE (1) | DE60007799T2 (en) |
| FR (1) | FR2794854B1 (en) |
| IL (1) | IL136555A (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB998450A (en) * | 1956-11-14 | 1965-07-14 | Mini Of Nat Defence Of Canada | Reduction of gun barrel wear |
| GB950609A (en) | 1959-08-14 | 1964-02-26 | Military Training Device Co Ak | Improvements in or relating to ammunition cartridges |
| DE1578199B1 (en) * | 1966-01-24 | 1970-03-05 | Prb Nv | Cartridge or the like for firearms |
| FR1526983A (en) | 1966-01-24 | 1968-05-31 | Prb Nv | Erosion reducer |
| US3403625A (en) * | 1968-01-18 | 1968-10-01 | Wegematic Corp | Wear reduction additives |
| DE3544907A1 (en) * | 1985-12-19 | 1987-06-25 | Diehl Gmbh & Co | ADDITIVE CUFF FOR LARGE-CALIBRED PROTECTIVE AMMUNITION TO PROTECT THE ARMON TUBE |
-
1999
- 1999-06-08 FR FR9907219A patent/FR2794854B1/en not_active Expired - Fee Related
-
2000
- 2000-05-30 AT AT00401523T patent/ATE258305T1/en active
- 2000-05-30 DE DE60007799T patent/DE60007799T2/en not_active Expired - Lifetime
- 2000-05-30 EP EP00401523A patent/EP1059505B1/en not_active Expired - Lifetime
- 2000-06-05 IL IL13655500A patent/IL136555A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE60007799D1 (en) | 2004-02-26 |
| FR2794854A1 (en) | 2000-12-15 |
| IL136555A (en) | 2003-03-12 |
| DE60007799T2 (en) | 2004-11-25 |
| FR2794854B1 (en) | 2002-05-17 |
| IL136555A0 (en) | 2001-06-14 |
| ATE258305T1 (en) | 2004-02-15 |
| EP1059505A1 (en) | 2000-12-13 |
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