EP2173507B1 - Procédé et dispositif de fabrication d'un corps solide de forme tubulaire à partir d'un alliage de tungstène et de métaux lourds à haut point de fusion, en particulier comme ébauche pour la fabrication d'un pénétrateur pour munitions à haute pénétration et effet de fragmentation - Google Patents
Procédé et dispositif de fabrication d'un corps solide de forme tubulaire à partir d'un alliage de tungstène et de métaux lourds à haut point de fusion, en particulier comme ébauche pour la fabrication d'un pénétrateur pour munitions à haute pénétration et effet de fragmentation Download PDFInfo
- Publication number
- EP2173507B1 EP2173507B1 EP08784808.1A EP08784808A EP2173507B1 EP 2173507 B1 EP2173507 B1 EP 2173507B1 EP 08784808 A EP08784808 A EP 08784808A EP 2173507 B1 EP2173507 B1 EP 2173507B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filling
- tube
- filler piece
- extrusion die
- metal powder
- 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.)
- Not-in-force
Links
Images
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
- F42B33/0214—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges by casting
- F42B33/0242—Filling cartridges, missiles, or fuzes; Inserting propellant or explosive charges by casting by pressure casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1035—Liquid phase sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/045—Alloys based on refractory metals
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
- F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
- F42B12/20—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
- F42B12/22—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the invention relates to a method and an apparatus for producing a rohrformige penetrator for a balancing projectile with splinter effect.
- the US 2005/0006825 A1 relates to a process for the production of a molded green body or of inserts during hardening of the green body.
- This ceramic powder is pressed in an isostatic pressing device to a green compact.
- the Pressvorrich. tion consists in turn of a metal tube which is closed by a detachably arranged upper lid, wherein a part of the lid engages in a flexible tube which is inserted in a tubular sealing rubber.
- the sealing rubber stores the flexible tube in the center of the metal tube.
- the metal tube has an opening at the side for the pressure inlet. From below, the metal tube is provided with a hole possessing metal lid. Through this lower lid, the ceramic powder located in Matrizen is introduced into the device and this closed. Then the flexible tube is pressed against the dies and the latter against the powdered ceramic via the lateral pressure inlet.
- the pressing process takes place hydrostatically.
- the JP 2004114139 A discloses a device for kafthydrostatik pressing for the production of a molding with a number of holes with completely uniform Puderdlchte.
- the device comprises an elastic frame as well as an upper and a lower lid for closing the upper and lower open sections, as well as a number of metallic inserts.
- WSM tungsten heavy metal
- tubular penetrators are used for special ammunition, such as PELE, ALP or WSM explosive projectile. These are to avoid possible collateral damage of a penetrator, for example, when penetrating a wall or the like.
- penetrators are previously made of solid rods, which are subsequently processed by deep hole drilling, so as to be hollowed out or pierced. This process is technically very complicated and not economical.
- a method for producing such a Vollpenetrators is for example from the DE 10 2005 049 748 A1 known.
- For cost-effective production of such a penetrator is introduced into a, adapted to the outer dimensions of the penetrator concentric with the dimension of the Penetratorkems Doppeltrichterein colllvorraum, creating a gap is created.
- a first tungsten-like powder mixture with high tungsten content is filled in the inner tube to produce the penetrator core
- a second tungsten-containing powder mixture is introduced into the annular space, which has a lower tungsten content than the other powder mixture.
- a powder mixture is pressed into a pressed body, the body is then sintered.
- a further step is then carried out the cold forming of the compact and the finishing of the Penetratorrohlings.
- the GB 2 165 483 A describes an apparatus and method for producing a pressed tubular body having a groove on its outer surface.
- the body is formed by isostatic pressing of particulate material in an elastic mold which is closed at one end by means of a mold closure and core support member. This produces ceramic insulators.
- the invention addresses the problem of demonstrating a cost-effective method and a device for carrying out this method for the production of penetrators for balancing projectiles with splintering effect.
- the invention is based on the idea to produce such pipes or tubular penetrators, in which both ends can be open or closed, in the sintering process without reworking the inner contour.
- Sintering is done with an internal medium in the blank, which can be easily removed after sintering.
- the material properties are set by the alloy composition and characterized by heat treatment and, if necessary, mechanical deformation.
- the method can be used for small bars for mid caliber ammunition (eg outside ⁇ 22mm, inside ⁇ 15mm), as subcaliber big bullet ammunition and for big bars for full caliber ammunition 120mm (eg outside ⁇ 20mm, inside ⁇ 110mm).
- the material is a tungsten heavy metal alloy.
- Length and diameter are variable and are currently not limited by the process itself, but rather by conventional manufacturing equipment. But this has the advantage that existing manufacturing equipment can be used.
- a filling device consisting of an outer tube with a concentrically arranged pressing die and a filling piece with attached filling tube and centering part, is filled with a metal powder plaster.
- the length and diameter of the outer tube and the pressing die determine the outer contour, and the geometry of the case determines the inner contour of the tubular solid.
- a plastic centering is attached to one end and at the other end, the centering takes place via a plugged centering with firmly connected thereto filling tube.
- a filling of the cavity zwisehen Press die and filler with a metal powder mixture is made possible through the filling tube.
- the centering part together with the filling tube is removed from the filling piece.
- the metal powder mixture is refilled by hand to the desired height above the filler after removing centering and filling tube.
- the press die is closed with a stopper.
- the filling device For compacting the metal powder, the filling device is placed in a press plant and pressed into a green compact. This has, depending on the structure of the filling device, after removal from this, the shape of a unilaterally fugitive or open on both sides of the tube.
- the green compact is sintered in one or more passes, whereby known dimensions are produced from the compact workpieces with solid properties.
- tubes are produced for producing penetrators with very good fragmentation, which can be adjusted by the ratio of inner to outer diameter and the corresponding material or material composition.
- Fig. 1a . b show a filling device or mold 1 for producing a tubular, here closed on one side solid 10, (see. Fig. 2 ).
- the filling device Fig. 1 a consists of an outer tube 2 (preferably made of steel), in which bores are located on the mantle and bottom surface at regular intervals.
- a pressing die 3 preferably made of PU
- a filler 4 preferably made of metal
- a filling tube 5 attached to the outer tube 2 .
- the concentricity of the filler 4 is ensured by a centering disc 6 (preferably made of PU) at the lower end and plugged on the filler centering part 7 of the filling tube 5 at the upper end. Centering 7 and filling tube 5 are firmly connected. It is filled in between a press die 3 and 4 filling spacer space 8.
- the filling device Fig. 1b placed in a hydrostatic pressing system (not shown in detail, as known) and at a pressure of about 1500 bar, the metal powder mixture is pressed into a green compact. This has after removal from the filling device Fig. 1b the shape of a unilaterally sealed tube and can be handled without breaking.
- the pressed tubes are then sintered in one or more passes in an oven (pre-sintering at a temperature between 1400 ° C and 1490 ° C, resintering at a temperature between 1495 ° C and 1570 ° C), so that from the compact workpieces with solid properties getting produced.
- pre-sintering at a temperature between 1400 ° C and 1490 ° C, resintering at a temperature between 1495 ° C and 1570 ° C
- the pressed tubes during pre-and Vietnamese sintem a preselected time-temperature curve, it being ensured that forms in a stable tungsten skeleton, a melt of tungsten and the remaining binder elements and evenly dwindles in all directions, so that after the Nachsintem a geometric desired solid arises, such as in Fig. 2 demonstrated.
- the solids are subjected to a heat treatment after the sintering.
- a heat treatment after the sintering.
- eg tensile strength, elongation at break and constriction can be adjusted.
- This is preferably carried out in an annealing process, in which the annealing in a high vacuum below the melting temperature of the binder leads to a phase transformation, which leads to the subsequent quenching, for example in N 2 for fixing the material state and thus the material properties.
- Fig. 2 is a tubular Festköper for producing an ammunition not shown (for example, a balancing projectile projectile) shown, which has been prepared by the method described above and the adjusted solid state properties having.
- This has L g a predetermined total length and L v a length of the solid body and has an inner diameter d i and an outer diameter d a .
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Combustion & Propulsion (AREA)
- Powder Metallurgy (AREA)
Claims (12)
- Procédé de fabrication d'un pénétrateur tubulaire pour munition propulsée à fragmentation, le procédé présentant les étapes suivantes :un ensemble de remplissage constitué d'un tube extérieur (2) dans lequel est située une matrice de presse (3) ainsi qu'une pièce de remplissage (4) est rempli d'un mélange de poudre métallique dans un espace intermédiaire (8) formé entre la pièce de remplissage (4) et la matrice de presse (3), l'espace intermédiaire étant ensuite fermé,pour comprimer la poudre métallique, l'ensemble de remplissage (1) est placé dans une presse hydrostatique et le mélange de poudre métallique est comprimé pour former une pièce crue,la pièce crue est ensuite frittée en un ou plusieurs passages dans un four, la pièce crue subissant à cet effet une évolution présélectionnée de la température en fonction du temps de manière à garantir la formation d'un bain de fusion qui se contracte uniformément dans toutes les directions, de telle sorte qu'après le frittage, on obtienne un corps solide de géométrie souhaitée etaprès le frittage, le corps solide subit un traitement thermique qui permet d'établir sa résistance en traction et son allongement à la rupture.
- Procédé selon la revendication 1, caractérisé en ce que le traitement thermique est de préférence un traitement de recuit dans lequel le recuit réalisé sous vide poussé et en dessous de la température de fusion du liant conduit à une conversion de phase.
- Procédé selon la revendication 2, caractérisé en ce que lors de la trempe ultérieure, l'état du matériau et donc les propriétés du matériau sont fixées.
- Procédé selon l'une des revendications 1 à 3, caractérisé en ce qu'après le traitement thermique, le corps solide subit une opération de forgeage qui augmente la contrainte d'écoulement et la résistance en traction.
- Procédé selon l'une des revendications 1 à 4, caractérisé en ce que le remplissage de l'ensemble de remplissage par la poudre métallique s'effectue par un tube de remplissage (5) placé sur la pièce de remplissage (4) et permettant de remplir l'espace situé entre la pièce de remplissage (4) et la matrice de presse (3).
- Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le tube de remplissage (5) est enlevé après le remplissage de l'ensemble de remplissage.
- Procédé selon la revendication 6, caractérisé en ce qu'après l'enlèvement du tube de remplissage (5) et de la pièce de centrage (7), le mélange de poudre métallique est versé à la main jusqu'à la hauteur souhaitée au-dessus de la pièce de remplissage (4).
- Procédé selon l'une des revendications 1 à 7, caractérisé en ce que la fermeture de l'espace intermédiaire (8) s'effectue par un bouchon (9).
- Procédé selon l'une des revendications 1 à 8, caractérisé en ce que l'alliage est un alliage de métaux lourds et de tungstène contenant de 80 à 98 % en poids de tungstène et au moins un deuxième composant de l'ensemble constitué par Ti, V, Cr, Mn, Fe, Co, Ni, Mo ou une quelconque de leur combinaison.
- Procédé selon l'une des revendications 1 à 9, caractérisé en ce que l'effet de fragmentation du pénétrateur peut être ajusté par l'intermédiaire du rapport entre le diamètre intérieur (di) et le diamètre extérieur (da) et du matériau ou de la composition de matériau correspondant.
- Ensemble de remplissage permettant la fabrication d'un pénétrateur tubulaire pour munition propulsée à fragmentation en vue de la réalisation du procédé selon l'une des revendications 1 à 10, présentant un tube extérieur (2), une matrice de presse (3) disposée concentriquement dans le tube extérieur (2) et une pièce de remplissage (4), un espace intermédiaire (8) se formant entre la matrice de presse (3) et la pièce de remplissage (4) et étant rempli d'un mélange de poudre métallique,
caractérisé en ce queun tube de remplissage (5) est placé sur la pièce de remplissage (4) pour remplir l'espace intermédiaire (8),un disque de centrage (6) en matière synthétique et de préférence en PU est placé à l'extrémité inférieure de la matrice de presse (3) et une pièce de centrage (7) est placée sur la pièce de remplissage (4), la pièce de centrage (7) et le tube de remplissage (5) sont reliés solidairement l'une à l'autre. - Ensemble de remplissage selon la revendication 11, caractérisé en ce que le tube extérieur (2) est un tube en acier et la matrice de presse (3) un tube en PU.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007037702A DE102007037702A1 (de) | 2007-08-09 | 2007-08-09 | Verfahren und Vorrichtung zur Herstellung eines rohrförmigen Festkörpers aus einer hochschmelzenden Wolfram-Schwermetalllegierung, insbesondere als Halbzeug für die Fertigung eines Penetrators für ein Wuchtgeschoss mit Splitterwirkung |
PCT/EP2008/005800 WO2009018902A1 (fr) | 2007-08-09 | 2008-07-16 | Procédé et dispositif de fabrication d'un corps solide de forme tubulaire à partir d'un alliage de tungstène et de métaux lourds à haut point de fusion, en particulier comme ébauche pour la fabrication d'un pénétrateur pour munitions à haute pénétration et effet de fra |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2173507A1 EP2173507A1 (fr) | 2010-04-14 |
EP2173507B1 true EP2173507B1 (fr) | 2014-02-26 |
Family
ID=39800561
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08784808.1A Not-in-force EP2173507B1 (fr) | 2007-08-09 | 2008-07-16 | Procédé et dispositif de fabrication d'un corps solide de forme tubulaire à partir d'un alliage de tungstène et de métaux lourds à haut point de fusion, en particulier comme ébauche pour la fabrication d'un pénétrateur pour munitions à haute pénétration et effet de fragmentation |
Country Status (4)
Country | Link |
---|---|
US (1) | US20110176951A1 (fr) |
EP (1) | EP2173507B1 (fr) |
DE (1) | DE102007037702A1 (fr) |
WO (1) | WO2009018902A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11149343B2 (en) * | 2015-05-28 | 2021-10-19 | Materion Corporation | Processes for refurbishing a spent sputtering target |
DE102015117018A1 (de) | 2015-10-06 | 2017-04-06 | Rheinmetall Waffe Munition Gmbh | Penetrator sowie unterkalibriges Geschoss |
US20190017791A1 (en) * | 2017-03-07 | 2019-01-17 | U.S. Army Research Laboratory Attn: Rdrl-Loc-I | Reduced Jacketed Bullet Bore Resistance |
CN115109977A (zh) * | 2021-03-23 | 2022-09-27 | 安泰科技股份有限公司 | 一种超大规格高性能钨合金管及其制备方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2165483A (en) * | 1984-10-15 | 1986-04-16 | Champion Spark Plug Co | Isostatically pressing a body from particulate material |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3753704A (en) * | 1967-04-14 | 1973-08-21 | Int Nickel Co | Production of clad metal articles |
DE3821474C1 (de) | 1988-06-25 | 1998-08-27 | Nwm De Kruithoorn Bv | Unterkalibriges, drallstabilisiertes Mehrzweckgeschoß |
DE4124198A1 (de) | 1991-07-20 | 1993-01-21 | Sinterstahl Gmbh | Verfahren zur herstellung von sinterformteilen mittels kaltisostatischen pulverpressens in einmal verwendbaren pressformen |
DE4318827C2 (de) * | 1993-06-07 | 1996-08-08 | Nwm De Kruithoorn Bv | Schwermetallegierung und Verfahren zu ihrer Herstellung |
JP2004114139A (ja) | 2002-09-30 | 2004-04-15 | Kyocera Corp | 冷間静水圧成形用治具及びそれを用いた成形体の製造方法 |
JP4497854B2 (ja) | 2003-07-09 | 2010-07-07 | 株式会社明電舎 | インサート本体の加圧成形体の製造方法及びインサート本体の製造方法 |
DE102005021982B4 (de) * | 2005-05-12 | 2007-04-05 | Rheinmetall Waffe Munition Gmbh | Verfahren zur Herstellung eines Penetrators |
DE102005049748A1 (de) | 2005-10-18 | 2007-04-19 | Rheinmetall Waffe Munition Gmbh | Verfahren zur Herstellung eines Penetrators |
-
2007
- 2007-08-09 DE DE102007037702A patent/DE102007037702A1/de not_active Withdrawn
-
2008
- 2008-07-16 WO PCT/EP2008/005800 patent/WO2009018902A1/fr active Application Filing
- 2008-07-16 US US12/673,424 patent/US20110176951A1/en not_active Abandoned
- 2008-07-16 EP EP08784808.1A patent/EP2173507B1/fr not_active Not-in-force
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2165483A (en) * | 1984-10-15 | 1986-04-16 | Champion Spark Plug Co | Isostatically pressing a body from particulate material |
Also Published As
Publication number | Publication date |
---|---|
WO2009018902A1 (fr) | 2009-02-12 |
US20110176951A1 (en) | 2011-07-21 |
EP2173507A1 (fr) | 2010-04-14 |
DE102007037702A1 (de) | 2009-02-12 |
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