EP0000438B1 - Procédé de fabrication de pièces tubulaires - Google Patents

Procédé de fabrication de pièces tubulaires Download PDF

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Publication number
EP0000438B1
EP0000438B1 EP78300126A EP78300126A EP0000438B1 EP 0000438 B1 EP0000438 B1 EP 0000438B1 EP 78300126 A EP78300126 A EP 78300126A EP 78300126 A EP78300126 A EP 78300126A EP 0000438 B1 EP0000438 B1 EP 0000438B1
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EP
European Patent Office
Prior art keywords
tube
die
forming tool
necked
necking
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
Application number
EP78300126A
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German (de)
English (en)
Other versions
EP0000438A1 (fr
Inventor
Geoffrey Martin Spence
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0000438A1 publication Critical patent/EP0000438A1/fr
Application granted granted Critical
Publication of EP0000438B1 publication Critical patent/EP0000438B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/54—Making hollow objects characterised by the use of the objects cartridge cases, e.g. for ammunition, for letter carriers in pneumatic-tube plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/04—Shaping thin-walled hollow articles, e.g. cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K21/00—Making hollow articles not covered by a single preceding sub-group
    • B21K21/12—Shaping end portions of hollow articles
    • B21K21/14—Shaping end portions of hollow articles closed or substantially-closed ends, e.g. cartridge bottoms

Definitions

  • This invention relates to a cold working process for the manufacture from an open-ended hollow metal tube of a hollow tubular article having a shaped head.
  • the invention is particularly concerned with a process for the manufacture of shell and cartridge cases.
  • a known process for the manufacture of shell and cartridge cases consists of stamping a disc from a brass sheet, forming the disc into a tube closed at one end, progressively drawing the tube to the required length, stamping a primer pocket in the base of the tube, and finally drilling a hole through the base of the tube, the drilled hole communicating with the pocket to form a primer vent.
  • Such a process involves several different operations and is therefore time consuming and relatively expensive.
  • the tube is extended to three or four times its original length and it must therefore be annealed during the drawing process.
  • an open-ended hollow metal tube is subjected to a three- stage cold forming process.
  • the tube is necked in a necking die, in the second stage it is drawn to its final length, and in the third stage the head is pressed to the desired shape.
  • different tooling is used for performing each stage so that the tube has to be extracted and transferred from one tool to another between each of the stages.
  • a cold working process for the manufacture from an open-ended hollow metal tube of a hollow tubular article having a shaped head characterised in that the process comprises supporting the tube in a die with one end of the tube projecting beyond the end of a first forming tool inserted into the tube, initially necking the projecting end of the tube in a necking portion of the die, and thereafter, with the necked tube held in the die by the first forming tool, compressing the necked portion of the tube between the first forming tool, and a second forming tool to form the shaped head.
  • the first and second forming tools are so designed that when the necked portion of the tube is compressed between the two tools the head of the shell or cartridge case is formed with a primer pocket and vent.
  • a cold working process for the manufacture from an open-ended hollow metal tube of a tubular metal shell or cartridge case characterised in that the process comprises supporting the tube in a die with one end of the tube projecting beyond the end of a first forming tool inserted into the tube, initially necking the projecting end of the tube in a necking portion of the die and thereafter, with the necked tube held in the die by the first forming tool, compressing the necked portion of the tube between the first forming tool and a second forming tool to form the head of the shell or cartridge case with a primer pocket and vent.
  • a cold working process for the manufacture from an open-ended hollow metal tube of a hollow tubular article having a shaped head characterised in that the process comprises supporting the tube in a die with one end of the tube projecting beyond the end of a first forming tool inserted into the tube, the first forming tool being surrounded by a spring loaded sleeve which engages the end face of the tube, inserting the first forming tool into the die such that the projecting end of the tube is necked in a necking portion of the die, advancing a second forming tool toward the first forming tool, the second forming tool being slidably received in a bore formed in the die beneath the necking portion thereof, the advancing end face of the second forming tool having a substantially circular projecting portion with a diameter substantially equal to the internal diameter of the necked portion of the tube, the said projecting portion being inserted into the mouth of the necked portion of the tube before an annular portion of the said
  • the necked portion of the tube is fully supported both internally and externally during its compression between the two forming tools.
  • the process is performed in a single die, and is a substantially continuous operation with only two working strokes.
  • an annealed brass tube 10 is shown inserted into a three-part die 21.
  • the tube 10 is mounted on a spring loaded first forming tool 12.
  • a sleeve 13 surrounding the first forming tool 12 is provided with an outer collar (not shown) which prevents the wall of the tube 10 deforming as the tube is progressively necked in the die parts 21 a and 21 b.
  • the die part 21 has a second forming tool 15 slidably received therein.
  • the face 16 of the second forming tool 15 includes an annular projection 17 having an outer diameter substantially equal to the internal diameter of the necked portion of the tube 10.
  • a pin 18 is slidably received in the central hole of the projection 17.
  • the next step in the process is shown in Fig. 2.
  • the first forming tool 12 and the second forming tool 15 are moved toward one another with the pin 18 locked in a position protruding above the annular projection 17.
  • the metal of the tube 10 is displaced inwardly through substantially 90°. This is the only space available into which the metal can flow when compressed between the first forming tool 12 and the surface 16 of the second forming tool 15.
  • the pin 18 finally enters the hole 22 in the first forming tool 12 as shown in Fig. 4.
  • the resulting distribution of metal at the bottom of the tube 10 provides a base which includes a recess or pocket having a shape corresponding to the projection 17 and which further includes a hole corresponding to the shape of the pin 18, this hole communicating with the recess and being positioned centrally thereof.
  • the pocket thus forms the conventional primer pocket for receiving a primer charge when the tube 10 has been drawn and filled with a propellant mixture for the cartridge projectile.
  • the tube 10 is drawn to about two or three times its length by means of the swaging die 19 as shown in Figs. 3 and 4. In these figures the angles of the swaging work faces are exaggerated.
  • the shoulder 19 of the die part 21b is omitted, the die 21 is recessed as shown in dashed outline in Fig. 2, and the first forming tool is displaced an extra distance. This additional movement of the first forming tool displaces metal into the recess 23 and thus forms the projecting rim.
  • the required variation in wall thickness for a particular case can, if the case is short, be provided by the final motion of the die. Larger cases may be swaged by reverse motion of the die. The manufacture of a shell case is thus accomplished with a single die in a continuous two-stroke operation.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Claims (11)

1. Procédé d'écrouissage pour la fabrication d'un tube métallique creux à extrémité ouverte faisant partie d'un article tubulaire creux comportant une tête façonnée, caractérisé en ce qu'il comprend les étapes qui consistent à supporter le tube (10) dans une matrice (21) de telle sorte qu'une extrémité du tube (10) ressorte au-delà de l'extrémité d'un premier outil de formage (12) introduit dans le tube (10), former initialement un rétrécissement dans l'extrémité en saillie du tube (10) dans une partie de rétrécissement (21b) de la matrice (21), puis, tandis que le tube à rétrecissement (10) est maintenu dans la matrice (21) par le premier outil de formage (12), comprimer la partie rétrécie du tube (10) entre le premier outil de formage (12) et un second outil de formage (15) afin de former la tête façonnée.
2. Procédé suivant la revendication 1, caractérisé en ce qu'il comprend également l'étape qui consiste à introduire une partie (17) du second outil de formage (15) dans l'embouchure du tube à rétrécissement (10) avant de comprimer la partie rétrécie de ce tube (10) entre les deux outils (12, 15).
3. Procédé suivant la revendication 2, caractérisé en ce que la partie (17) du second outil de formage (15) est pratiquement circulaire et ressort d'une face en bout de ce dernier, le diamètre de cette partie circulaire en saillie étant pratiquement égal au diamètre intérieur de la partie rétrécie du tube (10).
4. Procédé suivant la revendication 3, caractérisé en ce que la partie circulaire en saillie (17) est entourée d'une partie annulaire (16) de la face en bout précitée qui vient s'engager ultérieurement sur la face en bout du tube à rétrécissement (10) au cours de la compression de la partie rétrécie entre les deux outils (12, 15).
5. Procédé suivant la revendication 1, caractérisé en ce que la matrice (21) peut être séparée en au moins deux parties, le rétrécissement du tube (10) étant effectué dans une première (21 b) de ces parties, tandis que, après formage de la tête, une seconde partie (21 c) de la matrice (21) est déplacée par rappport au premier outil de formage (12) en vue d'étirer le tube (10) à la longueur requise.
6. Procédé d'écrouissage suivant la revendication 5, caractérisé en ce que le rétrécissement du tube (10) et le façonnage de la tête sont effectués dans la première partie (21 b) de la matrice en déplaçant les deux outils de formage (12, 15) l'un vers l'autre dans une première course de travail, tandis que le mouvement de la seconde partie (21c) de la matrice (21) dans le but d'étirer le tube constitue une seconde course de travail, de telle sorte que l'article complet soit formé dans une seule matrice et en une opération continue à deux courses.
7. Procédé d'écrouissage suivant la revendication 5, caractérisé en ce que le premier outil de formage (12) va en diminuant en cône vers l'extrémité de l'outil supportant le tube (10), de telle sorte que le mouvement relatif entre le premier outil de formage (12) et la seconde partie (21c) de la matrice (21) ait pour effet d'emboutir le tube (10) et de définir une épaisseur progressivement décroissante en coupe.
8. Procédé d'écrouissage suivant la revendication 1, caractérisé en ce que le second outil de formage (15) peut coulisser dans un alésage formé dans la matrice (21), tandis que les deux outils de formage (12, 15) sont disposés de part et d'autre de la partie de rétrécissement de la matrice (21 ).
9. Procédé d'écrouissage suivant la revendication 8, caractérisé en ce que l'alésage définit une cavité en dessous de la partie de rétrécissement de la matrice (21), de telle sorte que le métal soit déplacé dans cette cavité au cours de la compression de la partie rétrécie du tube (10) entre les deux outils de formage, formant ainsi une bride ou un rebord en saillie sur la tête de l'article.
10. Procédé d'écrouissage pour la fabrication d'un tube métallique creux à extrémité ouverte faisant partie d'une douille de cartouche ou d'obus, caractérisé en ce qu'il comprend les étapes qui consistent à supporter le tube (10) dans une matrice (21) de telle sorte qu'une extrémité du tube (10) ressorte au-delà de l'extrémité d'un premier outil de formage (12) introduit dans le tube (10), former initialement un rétrécissement dans l'extrémité en saillie du tube dans une partie de rétrécissement (21 b) de la matrice (21) puis, tandis que le tube à rétrécissement est maintenu dans la matrice (21) par le premier outil de formage (12), comprimer la partie rétrécie du tube (10) entre le premier outil de formage (12) et un second outil de formage (15) afin de former une alvéole d'amorce et un évent dans la tête de la douille de cartouche ou d'obus.
11. Procédé d'écrouissage pour la fabrication d'un tube metallique creux à extrémité ouverte faisant partie d'un article tubulaire creux comportant une tête façonnée, caractérisé en ce qu'il comprend les étapes qui consistent à supporter le tube (10) dans une matrice de telle sorte qu'une extrémité du tube (10) ressorte au-delà de l'extrémité d'un premier outil de formage introduit dans le tube (10), ce premier outil de formage étant entouré d'un manchon à ressort (13) qui vient s'engager sur la face en bout du tube (10), introduire le premier outil de formage dans la matrice (21) de telle sorte que l'extrémité en saillie du tube (10) soit rétrécie dans une partie de rétrécissement (21 b) de la matrice (21) faire avancer un second outil de formage (15) vers le premier outil de formage (12), ce second outil de formage (15) coulissant dans un alésage formé dans la matrice (21 ) en dessous de la partie de rétrécissement (21 b) de cette dernière, la- face en bout du second outil de formage (15) qui avance, comportant une partie en saillie pratiquement circulaire (17) dont le diamètre est pratiquement égal au diamètre intérieur de la partie rétrécie du tube (10), cette partie en saillie (17) étant introduite dans l'embouchure de la partie rétrécie du tube (10) avant qu'une partie annulaire (16) de cette face en bout qui entoure la saillie circulaire (17) vienne s'engager sur la face en bout du tube à rétrécissement pour comprimer la partie rétrécie du tube (10) entre les deux outils (12, 15) et former ainsi la tête façonnée.
EP78300126A 1977-07-07 1978-07-06 Procédé de fabrication de pièces tubulaires Expired EP0000438B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB28495/77A GB1602973A (en) 1977-07-07 1977-07-07 Process for producing tubular articles
GB2849577 1977-07-07

Publications (2)

Publication Number Publication Date
EP0000438A1 EP0000438A1 (fr) 1979-01-24
EP0000438B1 true EP0000438B1 (fr) 1982-10-20

Family

ID=10276546

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78300126A Expired EP0000438B1 (fr) 1977-07-07 1978-07-06 Procédé de fabrication de pièces tubulaires

Country Status (6)

Country Link
US (1) US4198843A (fr)
EP (1) EP0000438B1 (fr)
JP (1) JPS5440276A (fr)
CA (1) CA1086112A (fr)
DE (1) DE2862061D1 (fr)
GB (1) GB1602973A (fr)

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NL8006992A (nl) * 1980-12-22 1982-07-16 Petrus Hendrikus Van Baal Werkwijze en inrichting voor het door koud vervormen vervaardigen van buisvormige, aan een einde althans in hoofdzaak gesloten houders uit pijpmateriaal.
DE3203438A1 (de) * 1982-02-02 1983-08-11 Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt Verfahren zur herstellung einer metallmuffe aus einem zylindrischen rohrabschnitt
IE60104B1 (en) * 1987-05-04 1994-06-01 Barrett James Fintan Process and apparatus for manufacturing pipe fittings
RU2113309C1 (ru) * 1996-03-26 1998-06-20 Евдокимов Анатолий Кириллович Способ получения гильз патронов стрелкового оружия
JP2000167637A (ja) * 1998-12-08 2000-06-20 Aida Eng Ltd 底部が側壁より厚い製品の製造方法
CN1309498C (zh) * 2005-06-15 2007-04-11 福建工程学院 弹头壳的多工位连续成形冲压工艺
US7131311B1 (en) * 2005-11-10 2006-11-07 Honda Motor Co. Ltd. Method of and apparatus for forming forging blank
RU2433012C1 (ru) * 2010-03-17 2011-11-10 Закрытое акционерное общество "Барнаульский патронный завод" Способ изготовления гильз патронов стрелкового оружия
RU2446908C2 (ru) * 2010-03-17 2012-04-10 Закрытое акционерное общество "Барнаульский патронный завод" Способ получения гильз патронов стрелкового оружия
RU2446909C2 (ru) * 2010-03-17 2012-04-10 Закрытое акционерное общество "Барнаульский патронный завод" Способ изготовления гильз патронов стрелкового оружия
DE102011077182A1 (de) 2011-06-08 2012-12-13 Robert Bosch Gmbh Verfahren zum Herstellen einer Drossel
CN102319813B (zh) * 2011-07-20 2013-07-31 沈阳飞机工业（集团）有限公司 小圆角盒类零件的模具制作工艺
US9016184B2 (en) * 2012-09-27 2015-04-28 National Machinery Llc Precision forged cartridge case
US9126258B2 (en) 2013-02-28 2015-09-08 Robert Rottinghaus Unitary connector pin formed by two-stage cold heading die
EP2789411B1 (fr) * 2013-04-08 2017-05-17 Neugebauer, Hans-Jürgen Procédé de fabrication d'un boîtier de cartouches de pistolet et presse à étages multiples pour mettre en oeuvre le procédé
US9010227B1 (en) * 2013-09-12 2015-04-21 Oleg Dyuzhev Method for commercial production of small-arms cartridge cases
US9670951B2 (en) * 2014-04-08 2017-06-06 A.A.M International S.A.R.L. Variable-wall light-weight axle shaft with an integral flange member and method for making the same
US9630451B2 (en) 2014-06-18 2017-04-25 American Axle & Manufacturing, Inc. Method of manufacturing hollow axle shaft for a vehicle
RU2584195C1 (ru) * 2014-10-29 2016-05-20 Общество С Ограниченной Ответственностью "Часовой Завод Ника" Способ изготовления цилиндрических деталей с конической частью
US10495430B2 (en) * 2017-03-07 2019-12-03 National Machinery Llc Long cartridge case
RU2677450C1 (ru) * 2017-12-15 2019-01-16 Акционерное общество "Научно-производственное предприятие "Алмаз" (АО "НПП "Алмаз") Способ пластического образования конусных отверстий
WO2023105381A1 (fr) * 2021-12-09 2023-06-15 Giorgio Pizzamiglio Procédé de fabrication de douilles de cartouches pour fusils de chasse à âme lisse et douille de cartouche pour fusils de chasse à âme lisse

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GB1538213A (en) * 1975-05-20 1979-01-10 Lucas Industries Ltd Method of manufacturing an extruded steel component for use in a roller clutch assembly

Also Published As

Publication number Publication date
EP0000438A1 (fr) 1979-01-24
DE2862061D1 (en) 1982-11-25
GB1602973A (en) 1981-11-18
US4198843A (en) 1980-04-22
CA1086112A (fr) 1980-09-23
JPS5440276A (en) 1979-03-29

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