WO1998043757A1 - Formage de corps de contenant etires - Google Patents

Formage de corps de contenant etires Download PDF

Info

Publication number
WO1998043757A1
WO1998043757A1 PCT/GB1998/000774 GB9800774W WO9843757A1 WO 1998043757 A1 WO1998043757 A1 WO 1998043757A1 GB 9800774 W GB9800774 W GB 9800774W WO 9843757 A1 WO9843757 A1 WO 9843757A1
Authority
WO
WIPO (PCT)
Prior art keywords
bead
central portion
wall
cup
base wall
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.)
Ceased
Application number
PCT/GB1998/000774
Other languages
English (en)
Inventor
Paul Porucznik
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.)
Crown Packaging UK Ltd
Crown Packaging Technology Inc
Original Assignee
CarnaudMetalbox PLC
Metal Box PLC
Crown Cork and Seal Technologies Corp
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 CarnaudMetalbox PLC, Metal Box PLC, Crown Cork and Seal Technologies Corp filed Critical CarnaudMetalbox PLC
Priority to AU64122/98A priority Critical patent/AU6412298A/en
Publication of WO1998043757A1 publication Critical patent/WO1998043757A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • 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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing
    • 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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner

Definitions

  • This invention relates to the forming of drawn container bodies, such as those produced by drawing a cup and subsequently reforming .the cup into a metal container body.
  • the reforming of the cup may be by way of a redraw step (the draw redraw process) or a wall ironing step (the DWI process) .
  • a method of forming a metal container body comprising the steps of drawing a metal cup having a side wall and a base wall, the base wall having a stepped portion comprising a generally transverse central portion surrounded by an annular wall portion, the generally transverse central portion including a locating feature adapted to receive the nose portion of a reform tool, and contacting the base with a reform tool so as to reform it by rolling the metal in the annular wall portion upwardly with respect to the generally transverse central portion to form a generally frustroconical annular wall portion between the central portion and the side wall of the redrawn cup. Reform cups with the locating feature on a "plain base" have previously been proposed, (see US4685322).
  • the feature serves to locate a reforming tool such as an ironing punch, and also acts as a guide to the material of the cup to urge it to deform in a regular and consistent manner.
  • the shape of the locating feature is selected so as to assist the cup material in following the shape of the nose of the reforming tool.
  • the locating feature comprises at least one bead in the generally transverse central portion of the base wall.
  • the at least one bead is an inwardly projecting bead, in which case the nose of the ironing punch can contact the side of the bead so as to be precisely located with respect to the reform cup.
  • the at least one bead is an outwardly projecting bead, in which case the nose of the ironing punch may be received within the bead.
  • the at least one bead is an annular bead.
  • the central portion of the base wall presents a generally convex surface to the reform tool. This arrangement, in addition to locating the reforming tool and cup one against the other, provides a relatively rigid base structure for the cup, yet one which is curved so as to be able to be deformed further by the reforming tool in a controlled rolling motion.
  • the stepped portion is preferably an inwardly projecting recess, providing an upwardly extending side wall which is reformed by the tool into the downwardly extending frustroconical outer wall portion of the base of the finished container.
  • the invention further resides in a drawn cup adapted to be redrawn and formed into a metal container body, the cup comprising a side wall and a base wall, the base wall having a stepped portion comprising a generally transverse central portion surrounded by an annular wall portion, the generally transverse central portion including a locating feature adapted to receive the nose of a reform tool.
  • Figure 1 is a schematic sectional view of a drawn cup according to the present invention.
  • FIGS 2 to 5 are schematic sectional views of apparatus for reforming the cup of Figure 1 shown at various stages of the reforming process.
  • Figure 6 is a schematic sectional view of the apparatus of Figures 2 to 5 shown in combination with a doming station for forming the bottom profile of a finished can.
  • a metallic cup is shown generally at 1 and comprises cylindrical side wall 2 and a base wall 3, the base wall having a stepped configuration consisting of a central panel 4 surrounded by an annular wall portion 5.
  • Central panel 4 comprises an annular bead 6 and a slightly convex centre portion 7.
  • annular trough 8 Between the annular bead 6 and the convex portion 7 is an annular trough 8 of a dimension such as to receive the nose of an ironing punch.
  • Figure 2 shows the cup 1 positioned in apparatus to reform it into a container body.
  • the apparatus comprises an ironing punch 9 reciprocating in a redraw sleeve 10 and having a shaped nose 11.
  • the ironing punch and redraw sleeve cooperate with a redraw die at 12 having a central orifice 13 in which the punch 9 is received.
  • the cup 1 is held between the sleeve 10 and redraw die 12, with the nose 11 of the punch being received in the annular trough 8 provided in the central panel of the cup .
  • Figures 3 to 5 show the sequence of events as the ironing punch 9 moves into the orifice 13 of the redraw die 12.
  • the punch is starting to reform the cup, rolling the annular portion 5 downwardly as ' the nose 11 of the punch advances.
  • the punch has advanced to a position where the wall portion 5 has been almost completely reversed to form the outer wall portion of the bottom profile of the container body.
  • the reversal of the annular wall portion is complete to form the outer wall portion at 14.
  • a doming station shown generally at 15, completes the forming of the base of the container body.
  • the doming station comprises a doming die 16 for forming the domed base of the container, and a draw die 17 for completing the formation of the outer wall portion 14.
  • the profile of the cup 1, with its bead 6, trough 8 and convex portion 7, ensures that the rolling of the metal in the annular wall takes place in a consistent and controlled manner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

Le corps d'un contenant métallique est formé par étirage d'une coupelle métallique comportant une paroi latérale (2) et une paroi de base (3). La paroi de base présente une partie centrale (4) généralement transversale entourée par une partie de paroi annulaire (5). Cette partie centrale (4) comprend un accessoire de positionnement, tel qu'un creux (8) adapté pour recevoir et positionner le nez d'un poinçon d'étirage (9). Ledit poinçon reforme la coupelle en enroulant le métal dans la partie de paroi annulaire (5), verticalement par rapport à la partie centrale, pour former la partie de paroi (14) généralement tronconique d'un contenant étiré. Le creux (8) sert à assurer que l'enroulement du métal dans la paroi annulaire s'effectue de manière constante et maîtrisée.
PCT/GB1998/000774 1997-03-27 1998-03-16 Formage de corps de contenant etires Ceased WO1998043757A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU64122/98A AU6412298A (en) 1997-03-27 1998-03-16 Forming drawn container bodies

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9706385.3 1997-03-27
GBGB9706385.3A GB9706385D0 (en) 1997-03-27 1997-03-27 Forming drawn container bodies

Publications (1)

Publication Number Publication Date
WO1998043757A1 true WO1998043757A1 (fr) 1998-10-08

Family

ID=10809968

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000774 Ceased WO1998043757A1 (fr) 1997-03-27 1998-03-16 Formage de corps de contenant etires

Country Status (3)

Country Link
AU (1) AU6412298A (fr)
GB (1) GB9706385D0 (fr)
WO (1) WO1998043757A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9327338B2 (en) 2012-12-20 2016-05-03 Alcoa Inc. Knockout for use while necking a metal container, die system for necking a metal container and method of necking a metal container
US9707615B2 (en) 2010-08-20 2017-07-18 Alcoa Usa Corp. Shaped metal container and method for making same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951296A (en) * 1971-09-02 1976-04-20 National Steel Corporation Reinforced wall-ironed container
US4151927A (en) * 1974-07-12 1979-05-01 Reynolds Metals Company Container construction
US4685322A (en) * 1985-09-03 1987-08-11 Aluminum Company Of America Method of forming a drawn and redrawn container body
US5016463A (en) * 1988-02-05 1991-05-21 Coors Brewing Company Apparatus and method for forming can bottoms
US5522248A (en) * 1993-08-18 1996-06-04 Aluminum Company Of America Method of forming a metal container body

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951296A (en) * 1971-09-02 1976-04-20 National Steel Corporation Reinforced wall-ironed container
US4151927A (en) * 1974-07-12 1979-05-01 Reynolds Metals Company Container construction
US4685322A (en) * 1985-09-03 1987-08-11 Aluminum Company Of America Method of forming a drawn and redrawn container body
US5016463A (en) * 1988-02-05 1991-05-21 Coors Brewing Company Apparatus and method for forming can bottoms
US5522248A (en) * 1993-08-18 1996-06-04 Aluminum Company Of America Method of forming a metal container body

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9707615B2 (en) 2010-08-20 2017-07-18 Alcoa Usa Corp. Shaped metal container and method for making same
US10464707B2 (en) 2010-08-20 2019-11-05 Alcoa Usa Corp. Shaped metal container and method for making same
US9327338B2 (en) 2012-12-20 2016-05-03 Alcoa Inc. Knockout for use while necking a metal container, die system for necking a metal container and method of necking a metal container

Also Published As

Publication number Publication date
AU6412298A (en) 1998-10-22
GB9706385D0 (en) 1997-05-14

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