US3604240A - Neck-forming apparatus for cartridge shells - Google Patents

Neck-forming apparatus for cartridge shells Download PDF

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Publication number
US3604240A
US3604240A US840010A US3604240DA US3604240A US 3604240 A US3604240 A US 3604240A US 840010 A US840010 A US 840010A US 3604240D A US3604240D A US 3604240DA US 3604240 A US3604240 A US 3604240A
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US
United States
Prior art keywords
mandrel
die
support
cavity
ejector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US840010A
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English (en)
Inventor
Rolf Weyhmuller
Franz Xander
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rheinmetall Air Defence AG
Original Assignee
Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Werkzeugmaschinenfabrik Oerlikon Buhrle AG filed Critical Werkzeugmaschinenfabrik Oerlikon Buhrle AG
Application granted granted Critical
Publication of US3604240A publication Critical patent/US3604240A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • a tubular mandrel and an ejector pin slidable in the mandrel enter the cavity through the tapering end, and a driver moves axially into and out of the other end,
  • a lost-motion coupling connects the driven ejector pin with the mandrel.
  • a neck is formed on a blank while the blank is pushed by the driver over the stationary mandrel in the tapering die end, The driver moves with the ejector pin to discharge the finished cart ridge shell,
  • PATENTEDSEP14 I971 SHEET 2 UF 4 PATENTED SEPI 4 ISII SHEET U 0F 4 I I l I" I m /A// m NECK-FORMING APPARATUS FOR CARTRIDGE SHELLS
  • This invention relates to the forming of a neck on a tubular blank, and will be described hereinafter with reference to the forming of a neck on an otherwise finished cartridge shell.
  • the primary object of the invention is the provision of apparatus for forming the neck of a cartridge shell or like tubular blank which is capable of reproducing a desired internal and external configuration with high precision at a high output rate, yet is simple and rugged in its construction, and therefore inexpensive to build and to maintain.
  • the apparatus of the invention permits the neck of a cartridge shell to be formed between a stationary mandrel and a stationary die while the blank is forced through the annular gap between the die and mandrel, and the apparatus is kept simple by the provision of a guide arrangement which guides the die during a limited axial movement on the supporting machine structure, and by coupling the mandrel to the driven ejector pin by a lost-motion coupling for joint axial movement.
  • FIG. 1 shows a neck-forming apparatus of the invention in elevational section
  • FIGS. 2 to 4 illustrate the apparatus of FIG. 1 in sequential other operating positions.
  • FIG. 1 there is seen a heavy-walled tubular die 1 whose cavity has a longer and wider axial front section of circular cross section, a narrower, short, cylindrical rear section, and an intermediate conical section axially connecting the two cylindrical sections.
  • the die 1 is axially slidably received in a conforming cylindrical bore of a guide sleeve 2 normally fixed in the stationary supporting structure 11 of the press.
  • Axial movement of the die 1 on the support 1 1 in a forward direction is limited by an internal flange 3 which bounds an opening 5 at the front end of the guide sleeve 2 aligned with the die cavity, and in the rearward direction by a cover 6 which is also normally fixed on the support 11 and assists in guiding the die 1.
  • a cover 6 which is also normally fixed on the support 11 and assists in guiding the die 1.
  • Several, circumferentially distributed, blind bores 4 in an annular radial face 19 of the cover 6 hold helical compression springs 7 which bias the die 1 toward the flange 5 (FIGS. 3to5).
  • the mandrel partly extends into the cylindrical front portion of the die cavity, and the forward terminal portion of the mandrel 10 has an annular, radially enlarged sizing portion 12 received in the conical section of the die cavity.
  • An annular notch 13 near the rear end of the mandrel 10 is engaged by two diametrically opposite U-shaped detents 14 radially slidable in recesses of the cover 6 and biased into locking engagement with the notch 13 by helical compression springs 18.
  • the reduced front portion 8 of an ejector pin 15 is slidably received in the bore of the mandrel l0 and connected with the mandrel by a lost-motion coupling. Rearward axial movement of the" pin 15 relative to the mandrel 10 is limited by abutting engagement of an enlarged head 9 on the free front end of the pin portion 8 against the front end of the mandrel.
  • a conical face of the pin 15 at the rear end of the pin portion 8 abuttingly engages the rear end of the mandrel 10.
  • the ejector pin 15 is moved longitudinally by a nonillustrated cam driven by the main drive shaft of the press in a known manner, not shown. 7
  • the pin 15 is longitudinally or axially aligned with the cylindrical ram or driver 17 of the press which is also cam-operated in the nonillustrated conventional manner referred to above, and thus is synchronized with the ejector pin 15.
  • the driver 17 moves into and out of the opening 5 in each cycle of press operation.
  • the driver 17 has pushed a tubular, bottomed cartridge-shell blank 16 into the die cavity, through the opening 5, and frictional engagement of the blank with the inner die wall has moved the die 1 against the restraint of the springs 7 to the fixed face 19 of the cover 6.
  • a reduced neck is formed on the open end of the blank 16.
  • the outer configuration of the neck is determined by the shape of the conical and narrower cylindrical walls of the die cavity, and the wall thickness of the cartridge shell neck is precisely determined by the spacing of the stationary sizing portion 12 from the stationary walls of the die 1 while the blank is forced over the sizing portion 12 by the driver 17
  • the driver 17 is thereafter withdrawn, the die 1 is moved by the springs 7 against the flange 3, and the ejector pin 15 moves forward (FIG. 3) to engage the inner bottom wall of the blank 13.
  • the blank is stretched axially and contracts radially until the neck portion of the finished cartridge shell expands resiliently to slip over the sizing portion 12.
  • the conical face of the ejector pin 15 cammingly dislodges the detents 14 from the notch 13 and thereafter abuts against the rear end of the mandrel 10 so that the pin 15, the mandrel l0, and the cartridge shell 16 move forward jointly into the position of FIG. 4 in which the cartridge shell 16 is fully exposed outside the cavity of the die 1 and may be removed by hand or by a nonillustrated automatic device.
  • the head 9 on the front portion 8 of the pin engages the front end of the mandrel 10 to couple the mandrel to the pin and shifts the mandrel rearward into a position in which the head 9 still partly projects from the opening 5 to facilitate insertion of the next blank 16 whereupon the condition seen in FIG. 1 is restored and another neck-forming cycle begins after the mandrel 10 is axially secured by the spring-loaded detents 14.
  • Cartridge shells have been produced on the illustrated apparatus from brass and mild steel to precisely reproducible shapes at high production rates, and the apparatus has performed satisfactorily over extended production runs.
  • apparatus for forming a neck on a tubular blank including a support, a die mounted on said support and formed with a cavity having an axis and tapering at one axial end, a driver member mounted on said support for axial movement into and out of said cavity through the other axial end thereof, a mandrel member in said tapering end of said cavity, an ejecd. cam means on said ejector member for releasing said detent means in response to an axial movement of said ejector member.
  • said mandrel member and said ejector member each having respective end eluding a support, a die mounted on said support and formed portions adjacent and remote from said driver member, the
  • said detent means including a de-"' tent member on said support, and yieldably resilient means biasing said detent member inward of said recess when the detent member and said recess are radially aligned.
  • said cam means inwith a cavity having an axis and tapering at one axial end, a driver member mounted on said support for axial movement into and out of said cavity through the other axial end thereof,
  • lost-motion coupling means coupling said mandrel member to said ejector member for joint axial movement
  • said coupling means including an enlarged head on said ejector member in said cavity and outside said passage
  • said head being dimensioned for engagement with an end face of said mandrel member.
  • said guide means including a guide member formed with a bore, said die being axially movable in said bore, and an internal flange on said guide member projecting into said bore and limiting the axial movement of said die.
  • yieldably resilient means biasing said die axially in said bore toward said flange and toward said driver member.
  • said yieldably resilient means including a plurality of spring members circumferentially distributed about said axis and each interposed 7 between said support and said die.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Forging (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US840010A 1968-07-12 1969-07-08 Neck-forming apparatus for cartridge shells Expired - Lifetime US3604240A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT678168A AT278487B (de) 1968-07-12 1968-07-12 Preßwerkzeug

Publications (1)

Publication Number Publication Date
US3604240A true US3604240A (en) 1971-09-14

Family

ID=3589699

Family Applications (1)

Application Number Title Priority Date Filing Date
US840010A Expired - Lifetime US3604240A (en) 1968-07-12 1969-07-08 Neck-forming apparatus for cartridge shells

Country Status (6)

Country Link
US (1) US3604240A (en:Method)
AT (1) AT278487B (en:Method)
DE (1) DE1933488C3 (en:Method)
FR (1) FR2012860A1 (en:Method)
GB (1) GB1261766A (en:Method)
NL (1) NL6910670A (en:Method)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446714A (en) * 1982-02-08 1984-05-08 Cvacho Daniel S Methods of necking-in and flanging tubular can bodies
US6256853B1 (en) 2000-01-31 2001-07-10 Eveready Battery Company, Inc. Crimping die employing powered chuck
CN116871414A (zh) * 2023-07-10 2023-10-13 辽沈工业集团有限公司 一种用于金属塑性成型的弹体收口模具

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2330476A1 (fr) * 1975-11-10 1977-06-03 Haut Rhin Manufacture Machines Machine de retreint et de calibrage de pieces tubulaires
FR2475946A1 (fr) * 1980-02-14 1981-08-21 Haut Rhin Manufacture Machines Machine de matricage en continu

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US865257A (en) * 1903-04-15 1907-09-03 Hermann Kohl Apparatus for narrowing the walls of hollow bodies.
US2542508A (en) * 1949-11-18 1951-02-20 Prec Gear And Machine Company Ferrule reforming apparatus
US2755839A (en) * 1952-07-05 1956-07-24 Ainsworth Mfg Corp Apparatus for re-forming tubular members

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US865257A (en) * 1903-04-15 1907-09-03 Hermann Kohl Apparatus for narrowing the walls of hollow bodies.
US2542508A (en) * 1949-11-18 1951-02-20 Prec Gear And Machine Company Ferrule reforming apparatus
US2755839A (en) * 1952-07-05 1956-07-24 Ainsworth Mfg Corp Apparatus for re-forming tubular members

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4446714A (en) * 1982-02-08 1984-05-08 Cvacho Daniel S Methods of necking-in and flanging tubular can bodies
US6256853B1 (en) 2000-01-31 2001-07-10 Eveready Battery Company, Inc. Crimping die employing powered chuck
US6427302B2 (en) 2000-01-31 2002-08-06 Eveready Battery Company, Inc. Crimping die employing powered chuck
CN116871414A (zh) * 2023-07-10 2023-10-13 辽沈工业集团有限公司 一种用于金属塑性成型的弹体收口模具

Also Published As

Publication number Publication date
FR2012860A1 (en:Method) 1970-03-27
DE1933488C3 (de) 1974-02-14
DE1933488A1 (de) 1970-01-15
GB1261766A (en) 1972-01-26
AT278487B (de) 1970-02-10
DE1933488B2 (de) 1973-07-19
NL6910670A (en:Method) 1970-01-14

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