EP0334764A1 - Plastics projectile for short-range ammunition, and manufacturing method therefor - Google Patents
Plastics projectile for short-range ammunition, and manufacturing method therefor Download PDFInfo
- Publication number
- EP0334764A1 EP0334764A1 EP89400834A EP89400834A EP0334764A1 EP 0334764 A1 EP0334764 A1 EP 0334764A1 EP 89400834 A EP89400834 A EP 89400834A EP 89400834 A EP89400834 A EP 89400834A EP 0334764 A1 EP0334764 A1 EP 0334764A1
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- European Patent Office
- Prior art keywords
- belt
- plastic material
- ball according
- ball
- density
- 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.)
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Links
- 239000004033 plastic Substances 0.000 title claims abstract description 30
- 229920003023 plastic Polymers 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000002245 particle Substances 0.000 claims abstract description 15
- 239000007787 solid Substances 0.000 claims abstract description 12
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 239000000314 lubricant Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 27
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000004952 Polyamide Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 229910000906 Bronze Inorganic materials 0.000 claims description 4
- 239000010974 bronze Substances 0.000 claims description 4
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 2
- 229910000464 lead oxide Inorganic materials 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims description 2
- 229910002064 alloy oxide Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 4
- 239000004429 Calibre Substances 0.000 abstract 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000004959 Rilsan Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000002788 crimping Methods 0.000 description 2
- 230000001687 destabilization Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 208000031968 Cadaver Diseases 0.000 description 1
- 229910000994 Tombac Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000013528 metallic particle Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
- F42B14/02—Driving bands; Rotating bands
Definitions
- the present invention relates to a bullet for reduced-fire ammunition made of plastic material and its manufacturing process.
- the field of application of the invention relates more particularly to small caliber reduced shooting (5.56 for example), for instruction or close combat, taking into account the range limitation required for the ball.
- BALPLAST Some, marketed under the name BALPLAST, are based on plastic material of the polyamide type with a density close to 1, overmolded on a metal belt made, for example, of copper, brass or tombac.
- This metal belt has a double function.
- this belt has the role of ballasting the ball in order to make it more stable on its trajectory.
- this metal belt is capable of coming off the plastic material, as a result of a connection defect, in particular in rotation, which can cause destabilization of the trajectory of the ball. Fragmentation can also be caused when firing due to the heterogeneity of the bullet.
- the accuracy of the shot can be affected by the lack of concentricity of the belt and the body of the bullet.
- the belt must be precisely produced beforehand, and its positioning in the mold before injection molding must also be precise, these operations requiring numerous manipulations.
- Another disadvantage is that its cost remains high due to the exclusive use of an expensive charged plastic material.
- the object of the invention is to propose bullets made of plastic material intended for reduced shooting or close combat which are of reliable ballistic characteristics and adjustable over a wide range for these types of jobs, and the method of production of which ensures good reproducibility and low production cost.
- the ballistic characteristics of the balls according to the invention have the following advantages: - sufficient accuracy at a limited distance chosen (for example 100 m), comparable to that of a war bullet, which implies good stability on the initial part of the trajectory. - adjustable range limitation (for example 500 m), less than that of a war bullet, which implies destabilization of the bullet beyond the precise shooting distance. - weak annoying effect.
- these ballistic characteristics are obtained easily and at low cost by varying the geometry of the ball, its center of gravity, its density and its moments of inertia longitudinal and transverse and consequently the ratio of the latter.
- the invention relates to a bullet for reduced ammunition firing comprising a body of low density plastic material and a guide belt of higher density, characterized in that the belt is made of plastic material loaded with particles solids and containing particles of a lubricant.
- the body of the ball is made of plastic material with a density close to 1.
- This plastic material can be a polyamide, in particular known under the trade name RILSAN, having the physical and mechanical characteristics set out below, or any other material with similar characteristics: - density at 23 ° C: 1.04 ⁇ 0.02 - melting temperature: 183 to 187 ° C - traction characteristics at 23 ° C: flow threshold stress:> 40 MPa breaking stress:> 37 MPa elongation at break:> 250%
- the belt made of plastic material loaded with solid particles has a density between 2 and 6 and preferably close to 4.
- the solid particles are made of metal such as copper or lead, of an alloy such as bronze or of metal oxide such as lead oxide. They are preferably made up of bronze balls with a diameter of between 0.01 and 0.1 mm.
- the plastic material loaded with the belt also contains a solid lubricant. This is preferably molybdenum disulfide.
- the parameters influencing the ballistic characteristics of the ball can be adjusted according to the intended use by varying the geometry of the belt (height, thickness, positioning relative to the body of the ball), as well as the nature and composition of the materials. constitutive of the body and the belt.
- the presence of solid particles in the belt makes it possible to ballast the plastic material and to obtain the desired density for the bale by varying the content of solid particles.
- This density can vary over a wide range from 1.2 to 5, and preferably from 2 to 3.
- a perfect bond between the plastic material of the body of the ball and the belt is ensured thanks to the manufacturing process, in particular by reflow on the surface of the belt during the injection of the body and / or by devices making it possible to increase the surfaces in contact (grooves, grooves, for example).
- the crimping of the sleeve is carried out in a known manner above the belt, while the invention allows crimping on the belt with a range of freedom on its positioning. , and therefore on the dimensions of the socket.
- the resulting ball is therefore perfectly reproducible and has reliable ballistic characteristics.
- the balls can have different known shapes, such as conical, ogival, with flats, with shoulder of the ogival part.
- Figure 1 schematically shows the longitudinal section of a 5.56 caliber bullet whose body 1 with a length of 14.5 mm has a pointed ogival end and whose belt 2 is positioned 3 mm from the base.
- This frustoconical interior section belt slightly flared upwards with an opening angle of 3 degrees has an average thickness of 1.7 mm and an average height of 6 mm.
- the body is made of a polyamide with the commercial name RILSAN as defined above.
- the belt is made of a plastic material identical to that of the body, loaded with bronze balls with a diameter between 0.01 and 0.1 mm and containing a solid lubricant consisting of molybdenum disulfide. Its density and 4.
- Figure 2 differs from Figure 1 in the geometry of the belt. It is also of frustoconical interior section slightly flared upwards with an opening angle of 3 degrees, with an average thickness of 1.7 mm but its height is 8.5 mm.
- the density of this ball is 2.68.
- the balls can have other geometric characteristics and other compositions without departing from the scope of the invention.
- biinjecting presses are used provided with a multi-cavity rotary mold making it possible to mold, for example, 8 bales simultaneously.
- the molding of the body is done in masked time, compared to the injection of the belt. Indeed, it is performed while the injection of the belt is not finished. Therefore, the manufacturing time is not the sum of the durations of these two operations, but the duration of the longest of these.
- the quantity of charged plastic material required is much lower (for example by a third) than that used for the manufacture of the ball forming the object of the above-mentioned patent FR-B-2 528 564.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
La présente invention concerne une balle pour munitions de tir réduit en matériau plastique et son procédé de fabrication.The present invention relates to a bullet for reduced-fire ammunition made of plastic material and its manufacturing process.
Le domaine d'application de l'invention concerne plus particulièrement le tir réduit de petit calibre (5,56 par exemple), pour l'instruction ou le combat rapproché, compte-tenu de la limitation de portée requise pour la balle.The field of application of the invention relates more particularly to small caliber reduced shooting (5.56 for example), for instruction or close combat, taking into account the range limitation required for the ball.
Les balles connues dans ce genre d'application sont globalement de deux types.Bullets known in this kind of application are generally of two types.
Les unes, commercialisées sous la dénomination BALPLAST, sont à base de matériau plastique du type polyamide de densité voisine de 1, surmoulé sur une ceinture métallique réalisée, par exemple, en cuivre, en laiton ou en tombac.Some, marketed under the name BALPLAST, are based on plastic material of the polyamide type with a density close to 1, overmolded on a metal belt made, for example, of copper, brass or tombac.
Cette ceinture métallique a une double fonction.This metal belt has a double function.
En premier lieu, elle favorise la prise de rayure du canon de l'arme en assurant d'une part l'étanchéité entre la balle et l'intérieur du canon et en empêchant d'autre part l'encrassement du canon par le matériau plastique puisqu'elle tend à supprimer le contact entre le matériau plastique et l'intérieur du canon.Firstly, it favors the scratching of the barrel of the weapon by ensuring on the one hand the seal between the bullet and the inside of the barrel and by preventing on the other hand clogging of the barrel by the plastic material since it tends to suppress the contact between the plastic material and the inside of the barrel.
En second lieu, cette ceinture a pour rôle de lester la balle afin de la rendre plus stable sur sa trajectoire.Secondly, this belt has the role of ballasting the ball in order to make it more stable on its trajectory.
Cependant, ce type de balle à ceinture métallique présente des inconvénients.However, this type of metal belted bullet has drawbacks.
D'une part, cette ceinture métallique est susceptible de se décoller du matériau plastique, par suite d'un défaut de liaison, notamment en rotation, ce qui peut entraîner une déstabilisation de la trajectoire de la balle. Une fragmentation peut également être provoquée au moment du tir en raison de l'hétérogénéité de la balle.On the one hand, this metal belt is capable of coming off the plastic material, as a result of a connection defect, in particular in rotation, which can cause destabilization of the trajectory of the ball. Fragmentation can also be caused when firing due to the heterogeneity of the bullet.
D'autre part, la précision du tir peut être affectée par le manque de concentricité de la ceinture et du corps de la balle.On the other hand, the accuracy of the shot can be affected by the lack of concentricity of the belt and the body of the bullet.
Enfin, son procédé de fabrication est de mise en oeuvre assez complexe : la ceinture doit être préalablement réalisée avec précision, et son positionnement dans le moule avant surmoulage par injection doit être également précis, ces opérations nécessitant de nombreuses manipulations.Finally, its manufacturing process is fairly complex to implement: the belt must be precisely produced beforehand, and its positioning in the mold before injection molding must also be precise, these operations requiring numerous manipulations.
Aussi, la productivité de ce procédé est-elle limitée et le coût de la balle relativement élevé.Also, the productivity of this process is limited and the cost of the bale relatively high.
L'autre type de balle proposé plus récemment est décrit dans le brevet FR-A-2 528 564.The other type of ball proposed more recently is described in patent FR-A-2,528,564.
Il s'agit d'une balle d'exercice réalisée entièrement en matériau plastique chargé de particules métalliques et contenant un lubrifiant, la teneur des particules étant telle que la densité de la balle soit comprise entre 3 et 5.It is an exercise ball made entirely of plastic material loaded with metallic particles and containing a lubricant, the content of the particles being such that the density of the ball is between 3 and 5.
Un des inconvénients de cette balle, dépourvue de ceinture, réside dans le nombre limité des paramètres, à savoir la forme et la densité, agissant sur ses performances balistiques par suite de son caractère monobloc.One of the drawbacks of this ball, devoid of a belt, lies in the limited number of parameters, namely the shape and the density, acting on its ballistic performance owing to its one-piece nature.
Un autre inconvénient est que son coût reste élevé en raison de l'utilisation exclusive d'un matériau plastique chargé onéreux.Another disadvantage is that its cost remains high due to the exclusive use of an expensive charged plastic material.
L'invention a pour but de proposer des balles en matériau plastique destinées au tir réduit ou au combat rapproché qui soient de caractéristiques balistiques fiables et ajustables dans une large plage pour ces types d'emplois, et dont le procédé de réalisation assure une bonne reproductibilité et un faible coût de production.The object of the invention is to propose bullets made of plastic material intended for reduced shooting or close combat which are of reliable ballistic characteristics and adjustable over a wide range for these types of jobs, and the method of production of which ensures good reproducibility and low production cost.
Les caractéristiques balistiques des balles selon l'invention présentent les avantages suivants :
- précision suffisante à distance limitée choisie (par exemple 100 m), comparable à celle d'une balle de guerre, ce qui implique une bonne stabilité sur la partie initiale de la trajectoire.
- limitation ajustable de la portée (par exemple 500 m), inférieure à celle d'une balle de guerre, ce qui implique une déstabilisation de la balle au-delà de la distance de tir précis.
- faible effet vulnérant.The ballistic characteristics of the balls according to the invention have the following advantages:
- sufficient accuracy at a limited distance chosen (for example 100 m), comparable to that of a war bullet, which implies good stability on the initial part of the trajectory.
- adjustable range limitation (for example 500 m), less than that of a war bullet, which implies destabilization of the bullet beyond the precise shooting distance.
- weak annoying effect.
Conformément à l'invention, ces caractéristiques balistiques sont obtenues aisément et à faible coût en faisant varier la géométrie de la balle, son centre de gravité, sa densité et ses moments d'inertie longitudinal et transversal et par suite le rapport de ces derniers.According to the invention, these ballistic characteristics are obtained easily and at low cost by varying the geometry of the ball, its center of gravity, its density and its moments of inertia longitudinal and transverse and consequently the ratio of the latter.
Pour ce faire, l'invention a pour objet une balle pour munitions de tir réduit comprenant un corps en matériau plastique de faible densité et une ceinture de guidage de densité plus élevée, caractérisée en ce que la ceinture est réalisée en matériau plastique chargé de particules solides et renfermant des particules d'un lubrifiant.To do this, the invention relates to a bullet for reduced ammunition firing comprising a body of low density plastic material and a guide belt of higher density, characterized in that the belt is made of plastic material loaded with particles solids and containing particles of a lubricant.
L'invention a également pour objet un procédé de fabrication de la balle mettant en oeuvre des presses à biinjection et caractérisé en ce qu'il comprend les étapes suivantes :
- 1) on moule par injection la composition plastique constituant la ceinture, puis dans un même cycle,
- 2) on moule par injection le corps de la balle dans l'espace demeuré libre, la ceinture étant maintenue en position fixe dans le moule.
- 1) the plastic composition constituting the belt is injection molded, then in the same cycle,
- 2) the body of the ball is molded by injection into the space which remains free, the belt being held in a fixed position in the mold.
D'autres caractéristiques et avantages de l'invention apparaîtront dans la description suivante d'exemples non limitatifs, en référence aux figures parmi lesquelles :
- les figures 1 et 2 sont des coupes schématiques longitudinales d'exemples de balles selon l'invention.Other characteristics and advantages of the invention will appear in the following description of nonlimiting examples, with reference to the figures among which:
- Figures 1 and 2 are schematic longitudinal sections of examples of balls according to the invention.
Selon un mode de réalisation préféré de l'invention, le corps de la balle est réalisé en matériau plastique d'une densité voisine de 1.According to a preferred embodiment of the invention, the body of the ball is made of plastic material with a density close to 1.
Ce matériau plastique peut être un polyamide, notamment connu sous le dénomination commerciale RILSAN, présentant les caractéristiques physiques et mécaniques énoncées ci-après, ou tout autre matériau de caractéristiques voisines :
- densité à 23°C : 1,04 ± 0,02
- température de fusion : 183 à 187°C
- caractéristiques de traction à 23°C :
contrainte au seuil d'écoulement : > 40 MPa
contrainte à la rupture : > 37 MPa
allongement à la rupture : > 250 %This plastic material can be a polyamide, in particular known under the trade name RILSAN, having the physical and mechanical characteristics set out below, or any other material with similar characteristics:
- density at 23 ° C: 1.04 ± 0.02
- melting temperature: 183 to 187 ° C
- traction characteristics at 23 ° C:
flow threshold stress:> 40 MPa
breaking stress:> 37 MPa
elongation at break:> 250%
La ceinture en matériau plastique chargé de particules solides présente une densité comprise entre 2 et 6 et, de préférence, voisine de 4.The belt made of plastic material loaded with solid particles has a density between 2 and 6 and preferably close to 4.
Les particules solides sont en métal tel que le cuivre ou le plomb, en alliage tel que le bronze ou en oxyde métallique tel que l'oxyde plomb. Elles sont, de préférence constituées par des billes de bronze de diamètre compris entre 0,01 et 0,1 mm.The solid particles are made of metal such as copper or lead, of an alloy such as bronze or of metal oxide such as lead oxide. They are preferably made up of bronze balls with a diameter of between 0.01 and 0.1 mm.
Le matériau plastique chargé de la ceinture contient également un lubrifiant solide. Celui-ci est préférentiellement du bisulfure de molybdène.The plastic material loaded with the belt also contains a solid lubricant. This is preferably molybdenum disulfide.
Les paramètres influant sur les caractéristiques balistiques de la balle peuvent être ajustés suivant l'usage envisagé en faisant varier la géométrie de la ceinture (hauteur, épaisseur, positionnement par rapport au corps de la balle), ainsi que la nature et la composition des matériaux constitutifs du corps et de la ceinture.The parameters influencing the ballistic characteristics of the ball can be adjusted according to the intended use by varying the geometry of the belt (height, thickness, positioning relative to the body of the ball), as well as the nature and composition of the materials. constitutive of the body and the belt.
Notamment, la présence de particules solides dans la ceinture permet de lester le matériau plastique et d'obtenir la densité désirée pour la balle en faisant varier la teneur en particules solides. Cette densité peut varier dans une large gamme de 1,2 à 5, et de préférence de 2 à 3.In particular, the presence of solid particles in the belt makes it possible to ballast the plastic material and to obtain the desired density for the bale by varying the content of solid particles. This density can vary over a wide range from 1.2 to 5, and preferably from 2 to 3.
L'expérience montre que ces particules solides suffisent à obtenir la prise de rayure du canon de l'arme et empêchent l'encrassement de ce dernier.Experience shows that these solid particles are sufficient to obtain a scratch on the barrel of the weapon and prevent fouling of the latter.
Une liaison parfaite entre le matériau plastique du corps de la balle et la ceinture est assurée grâce au procédé de fabrication, notamment par une refusion en surface de la ceinture lors de l'injection du corps et/ou par des artifices permettant d'accroître les surfaces en contact (cannelures, stries, par exemple).A perfect bond between the plastic material of the body of the ball and the belt is ensured thanks to the manufacturing process, in particular by reflow on the surface of the belt during the injection of the body and / or by devices making it possible to increase the surfaces in contact (grooves, grooves, for example).
Par ailleurs, dans le cas d'une balle à ceinture métallique, le sertissage de la douille est effectué de façon connue au-dessus de la ceinture, tandis que l'invention autorise un sertissage sur la ceinture avec une plage de liberté sur son positionnement, et par conséquent sur les dimensions de la douille.Furthermore, in the case of a ball with a metal belt, the crimping of the sleeve is carried out in a known manner above the belt, while the invention allows crimping on the belt with a range of freedom on its positioning. , and therefore on the dimensions of the socket.
La balle obtenue est par conséquent parfaitement reproductible et de caractéristiques balistiques fiables.The resulting ball is therefore perfectly reproducible and has reliable ballistic characteristics.
Les balles peuvent présenter différentes formes connues, telles que coniques, ogivales, avec méplats, avec épaulement de la partie ogivale.The balls can have different known shapes, such as conical, ogival, with flats, with shoulder of the ogival part.
La figure 1 représente schématiquement la coupe longitudinale d'une balle de calibre 5,56 dont le corps 1 d'une longueur de 14,5 mm présente une extrémité ogivale pointue et dont la ceinture 2 est positionnée à 3 mm de l'embase. Cette ceinture de section intérieure tronconique légérement évasée vers le haut avec un angle d'ouverture de 3 degrés a pour épaisseur moyenne 1,7 mm et pour hauteur moyenne 6 mm. Le corps est réalisé en un polyamide de dénomination commerciale RILSAN tel que défini précédemment. La ceinture est réalisée en un matériau plastique identique à celui du corps, chargé de billes de bronze de diamètre compris entre 0,01 et 0,1 mm et renfermant un lubrifiant solide constitué par du bisulfure de molybdène. Sa densité et de 4.Figure 1 schematically shows the longitudinal section of a 5.56 caliber bullet whose body 1 with a length of 14.5 mm has a pointed ogival end and whose belt 2 is positioned 3 mm from the base. This frustoconical interior section belt slightly flared upwards with an opening angle of 3 degrees has an average thickness of 1.7 mm and an average height of 6 mm. The body is made of a polyamide with the commercial name RILSAN as defined above. The belt is made of a plastic material identical to that of the body, loaded with bronze balls with a diameter between 0.01 and 0.1 mm and containing a solid lubricant consisting of molybdenum disulfide. Its density and 4.
La densité de cette balle est de 2,34.The density of this ball is 2.34.
La figure 2 diffère de la figure 1 par la géométrie de la ceinture. Celle-ci est également de section intérieure tronconique légèrement évasée vers le haut avec un angle d'ouverture de 3 degrés, d'une épaisseur moyenne de 1,7 mm mais sa hauteur est de 8,5 mm.Figure 2 differs from Figure 1 in the geometry of the belt. It is also of frustoconical interior section slightly flared upwards with an opening angle of 3 degrees, with an average thickness of 1.7 mm but its height is 8.5 mm.
La densité de cette balle est de 2,68.The density of this ball is 2.68.
Les balles peuvent présenter d'autres caractéristiques géométriques et d'autres compositions sans sortir du cadre de l'invention.The balls can have other geometric characteristics and other compositions without departing from the scope of the invention.
Selon le procédé de fabrication de l'invention, on utilise des presses à biinjecter pourvues d'un moule rotatif multi empreintes permettant de mouler, par exemple, 8 balles simultanément.According to the manufacturing method of the invention, biinjecting presses are used provided with a multi-cavity rotary mold making it possible to mold, for example, 8 bales simultaneously.
Le surmoulage du corps se fait en temps masqué, par rapport à l'injection de la ceinture. En effet, il est effectué alors que l'injection de la ceinture n'est pas terminée. De ce fait, la durée de fabrication n'est pas la somme des durées de ces deux opérations, mais la durée de la plus longue de celles-ci.The molding of the body is done in masked time, compared to the injection of the belt. Indeed, it is performed while the injection of the belt is not finished. Therefore, the manufacturing time is not the sum of the durations of these two operations, but the duration of the longest of these.
En outre, la fabrication industrielle par deux opérations successives d'injection, sans extraire la ceinture, première partie injectée, permet de s'affranchir de la difficulté du positionnement de la ceinture rencontrée pour les balles à ceinture métallique.In addition, industrial manufacturing by two successive injection operations, without removing the belt, first part injected, overcomes the difficulty of positioning the belt encountered for bales with metal belts.
Enfin, la quantité de matériau plastique chargé nécessaire est nettement inférieure (par exemple d'un tiers) à celle utilisée pour la fabrication de la balle faisant l'object du brevet FR-B-2 528 564 susvisé.Finally, the quantity of charged plastic material required is much lower (for example by a third) than that used for the manufacture of the ball forming the object of the above-mentioned patent FR-B-2 528 564.
Les caractéristiques mentionnées ci-dessus permettent d'abaisser le coût de fabrication par rapport à celui des réalisations antérieures pour une production suffisante.The characteristics mentioned above make it possible to lower the manufacturing cost compared to that of previous embodiments for sufficient production.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1989604789 DE68904789T2 (en) | 1989-03-24 | 1989-03-24 | PLASTIC BULLET FOR A SHORT AMMUNITION AMMUNITION AND MANUFACTURING PROCESS THEREFOR. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8800578A FR2626069B1 (en) | 1988-01-20 | 1988-01-20 | BALL FOR REDUCED SHOT AMMUNITION IN PLASTIC MATERIAL AND METHOD FOR MANUFACTURING THE SAME |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0334764A1 true EP0334764A1 (en) | 1989-09-27 |
| EP0334764B1 EP0334764B1 (en) | 1993-02-10 |
Family
ID=9362450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19890400834 Expired - Lifetime EP0334764B1 (en) | 1988-01-20 | 1989-03-24 | Plastics projectile for short-range ammunition, and manufacturing method therefor |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0334764B1 (en) |
| FR (1) | FR2626069B1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2691156A1 (en) * | 1992-05-13 | 1993-11-19 | Sfm Defense | High density composite plastic material - includes mineral-filled polyamide or polyester resin and is useful in forming balls for use in firing range |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1212568A (en) * | 1958-03-31 | 1960-03-24 | A V R | Improvements to shaped charge projectiles |
| US2995090A (en) * | 1954-07-02 | 1961-08-08 | Remington Arms Co Inc | Gallery bullet |
| FR1283766A (en) * | 1961-03-16 | 1962-02-02 | Oregon Ets Patentverwertung | Projectile |
| US3040662A (en) * | 1959-11-19 | 1962-06-26 | William A Zisman | Bullets |
| GB1175274A (en) * | 1967-07-04 | 1969-12-23 | Imp Metal Ind Kynoch Ltd | Improvements in Bullets. |
| DE2025163A1 (en) * | 1969-05-23 | 1970-11-26 | Henry Cross ley (Packings) Ltd., Bolton, Lancashire (Großbritannien) | Bullet guide ring |
| EP0096617A1 (en) * | 1982-06-11 | 1983-12-21 | Societe Francaise De Munitions (S.F.M.) | Plastics projectile |
-
1988
- 1988-01-20 FR FR8800578A patent/FR2626069B1/en not_active Expired - Fee Related
-
1989
- 1989-03-24 EP EP19890400834 patent/EP0334764B1/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2995090A (en) * | 1954-07-02 | 1961-08-08 | Remington Arms Co Inc | Gallery bullet |
| FR1212568A (en) * | 1958-03-31 | 1960-03-24 | A V R | Improvements to shaped charge projectiles |
| US3040662A (en) * | 1959-11-19 | 1962-06-26 | William A Zisman | Bullets |
| FR1283766A (en) * | 1961-03-16 | 1962-02-02 | Oregon Ets Patentverwertung | Projectile |
| GB1175274A (en) * | 1967-07-04 | 1969-12-23 | Imp Metal Ind Kynoch Ltd | Improvements in Bullets. |
| DE2025163A1 (en) * | 1969-05-23 | 1970-11-26 | Henry Cross ley (Packings) Ltd., Bolton, Lancashire (Großbritannien) | Bullet guide ring |
| EP0096617A1 (en) * | 1982-06-11 | 1983-12-21 | Societe Francaise De Munitions (S.F.M.) | Plastics projectile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2691156A1 (en) * | 1992-05-13 | 1993-11-19 | Sfm Defense | High density composite plastic material - includes mineral-filled polyamide or polyester resin and is useful in forming balls for use in firing range |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2626069B1 (en) | 1993-05-28 |
| FR2626069A1 (en) | 1989-07-21 |
| EP0334764B1 (en) | 1993-02-10 |
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