EP0000438B1 - Verfahren zur Herstellung von rohrförmigen Hohlkörpern - Google Patents
Verfahren zur Herstellung von rohrförmigen Hohlkörpern Download PDFInfo
- 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
- Authority
- 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
Links
Images
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.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
Claims (11)
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 (de) | 1979-01-24 |
EP0000438B1 true EP0000438B1 (de) | 1982-10-20 |
Family
ID=10276546
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP78300126A Expired EP0000438B1 (de) | 1977-07-07 | 1978-07-06 | Verfahren zur Herstellung von rohrförmigen Hohlkörpern |
Country Status (6)
Country | Link |
---|---|
US (1) | US4198843A (de) |
EP (1) | EP0000438B1 (de) |
JP (1) | JPS5440276A (de) |
CA (1) | CA1086112A (de) |
DE (1) | DE2862061D1 (de) |
GB (1) | GB1602973A (de) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
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 |
PL2789411T3 (pl) * | 2013-04-08 | 2017-10-31 | Neugebauer Hans Juergen | Sposób wytwarzania łuski naboju do broni palnej oraz wielostanowiskowa prasa transferowa do realizacji tego sposobu |
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 (en) * | 2021-12-09 | 2023-06-15 | Giorgio Pizzamiglio | Method for manufacturing cases of cartridges for smoothbore shotguns and case of cartridge for smoothbore shotguns |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE514800A (de) * | ||||
US2089912A (en) * | 1935-05-23 | 1937-08-10 | Biginelli Oreste | Apparatus for making metal cases from tubular pieces |
CH178286A (fr) * | 1936-01-02 | 1935-07-15 | Biginelli Oreste | Procédé de fabrication d'une ébauche de douille de cartouche. |
US2394842A (en) * | 1942-12-26 | 1946-02-12 | Remington Arms Co Inc | Tool |
US2397206A (en) * | 1943-10-15 | 1946-03-26 | Fed Cartridge Corp | Welded steel component and method of manufacturing same |
DE893936C (de) * | 1949-07-20 | 1953-10-19 | Marianne Leussler | Verfahren zur span- und abfallosen Herstellung von Aluminiumhuelsen fuer Jagdschrotpatronen |
GB779730A (en) * | 1955-08-26 | 1957-07-24 | Barkway Engineering Company Lt | Process and apparatus for the manufacture of hollow metal bodies and hollow bodies thus produced |
FR77058E (fr) * | 1955-08-26 | 1962-01-12 | Barkway Engineering Co | Procédé et dispositifs pour la fabrication de corps creux en métal et corps creux ainsi produits |
US2980993A (en) * | 1956-08-10 | 1961-04-25 | Lyon George Albert | Method of and apparatus for forming flanged casing bottom |
US3456479A (en) * | 1967-08-18 | 1969-07-22 | Nickolai Ivanovich Matveev | Method of and apparatus for manufacturing hollow metal bodies provided with a polyhedral head portion adapted to have a wrench or equivalent tool applied thereto |
US3948073A (en) * | 1974-09-27 | 1976-04-06 | Robert Lovell | Apparatus and method of metal forming |
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 |
-
1977
- 1977-07-07 GB GB28495/77A patent/GB1602973A/en not_active Expired
-
1978
- 1978-07-05 CA CA306,834A patent/CA1086112A/en not_active Expired
- 1978-07-06 US US05/922,328 patent/US4198843A/en not_active Expired - Lifetime
- 1978-07-06 DE DE7878300126T patent/DE2862061D1/de not_active Expired
- 1978-07-06 EP EP78300126A patent/EP0000438B1/de not_active Expired
- 1978-07-07 JP JP8282278A patent/JPS5440276A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
EP0000438A1 (de) | 1979-01-24 |
JPS5440276A (en) | 1979-03-29 |
DE2862061D1 (en) | 1982-11-25 |
CA1086112A (en) | 1980-09-23 |
US4198843A (en) | 1980-04-22 |
GB1602973A (en) | 1981-11-18 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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