EP0868951A2 - Méthode de fabrication des boítes en métal et les boítes en métal fabriquées suivant cette méthode - Google Patents

Méthode de fabrication des boítes en métal et les boítes en métal fabriquées suivant cette méthode Download PDF

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Publication number
EP0868951A2
EP0868951A2 EP98302604A EP98302604A EP0868951A2 EP 0868951 A2 EP0868951 A2 EP 0868951A2 EP 98302604 A EP98302604 A EP 98302604A EP 98302604 A EP98302604 A EP 98302604A EP 0868951 A2 EP0868951 A2 EP 0868951A2
Authority
EP
European Patent Office
Prior art keywords
max
metal
cup
cans
dome
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.)
Granted
Application number
EP98302604A
Other languages
German (de)
English (en)
Other versions
EP0868951B1 (fr
EP0868951A3 (fr
Inventor
John Selwyn Williams
Brian John Bastable
Joseph Bulso
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.)
Corus UK Ltd
Redicon Corp
Original Assignee
British Steel PLC
Redicon 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 British Steel PLC, Redicon Corp filed Critical British Steel PLC
Publication of EP0868951A2 publication Critical patent/EP0868951A2/fr
Publication of EP0868951A3 publication Critical patent/EP0868951A3/fr
Application granted granted Critical
Publication of EP0868951B1 publication Critical patent/EP0868951B1/fr
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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • 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
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks
    • 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
    • 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—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, by deep-drawing operations performed on sheet material
    • B65D1/12—Cans, casks, barrels, or drums
    • B65D1/14—Cans, casks, barrels, or drums characterised by shape
    • B65D1/16—Cans, casks, barrels, or drums characterised by shape of curved cross-section, e.g. cylindrical
    • B65D1/165—Cylindrical cans
    • 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—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, 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
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material

Definitions

  • This invention relates to a method of producing metal cans and to metal cans produced by this method.
  • the required equipment is expensive and is normally only justified when large numbers of cans are to be produced.
  • the process is environmentally unfriendly because large volumes of water are used to cool and clean the can and solvents and other organics are emitted during the lacquer coating process.
  • DRD draw-redraw
  • ECCS electro-chromium coated steel
  • the present invention sets out to alleviate many of the problems associated with conventional can production processes, some of these being discussed above.
  • the invention addresses the difficulties associated with can shaping, especially can doming.
  • the dome of a can has to withstand high internal pressures to meet industrial standards at steels of low thickness (typically 0.15-0.16mm).
  • DWI cans are internally coated with a spray coat of 'lacquer' which must cover all the exposed metal. This is difficult to achieve on surfaces close to the vertical and on sharp radii.
  • a DWI can dome may be 'reformed' after spraying to alter geometry. Therefore, it is an object of the present invention to achieve the desired geometries without the need for reforming.
  • the feedstock preferably comprises a low carbon steel strip or sheet of less than 0.25mm thickness and coated on each of its surfaces with coherent laminated films of a thermoplastic polymer, the laminate coating having sufficient formability to withstand without loss of integrity reductions in thickness of up to 40%.
  • the polymer laminates may comprise films of polyethylene terephthalate and polypropylene. Other film materials may however be used.
  • the films may be bonded to the surfaces of the feedstock using heat and pressure.
  • the films may be coextruded whereby a bonding film of approximately 2 ⁇ m first makes contact with the feedstock followed by a polymer film coating which, after coating, is heated and cooled to produce an amorphous structure in the polyethylene terephthalate and a minimal crystalline structure in the polypropylene.
  • the steel is a high strength ductile steel known as TENFORM DR (RTM).
  • Strip produced from the feedstock may then be subjected to an electrolytic coating process.
  • the steel strip is cleaned and pickled before being passed through a plating bath in which it is coated with a thin layer of chromium metal (typically of 0.01 ⁇ m thickness) followed by a thin layer of chromium oxide (again typically of 0.01 ⁇ m thickness).
  • a plating bath in which it is coated with a thin layer of chromium metal (typically of 0.01 ⁇ m thickness) followed by a thin layer of chromium oxide (again typically of 0.01 ⁇ m thickness).
  • tinplate, blackplate or other suitable substrate could be employed.
  • the punch has a taper located between 15mm and 30mm from the top of the second redraw cup in the range 0.10mm - 0.25mm increase in diameter to aid stripping of the can from the punch.
  • the gap between the punch and the die (per side) at the widest point is controlled to between 1.0 and 1.20 times the starting laminate thickness.
  • Gap control or arrested draw is employed again as the second redraw stage to eliminate cup high spot clip offs or the generation of laminate "whiskers".
  • gaps of 0.10mm to 0.15mm are used between the pressure sleeve and die face dependent upon the laminate feedstock used.
  • the overall can wall thinning employed is 5 - 40% dependent upon the end use of the can.
  • a small reverse draw in the cup base may also be used in this operation depending upon the dome required in the final can.
  • Domes for carbonated beverages may be 206 (2 6/16 inches), 204 or 202 diameter.
  • the purpose of the reverse draw is to eliminate the tendency to form chime wrinkles in the finished can and to make the cup base more rigid and thus keep the can circular and eliminate the tendency for oval cans.
  • FIG 1 shows five stages of a cupping operation of the method of the present invention.
  • the five stages are labeled A to E.
  • Stage 1A shows a feedstock strip 1 of laminated steel strip held between a draw pad 2 and a blank and draw die 3.
  • a disc 4 of the required diameter is cut from the strip, by downward movement of a cutter 5 (see Figure 1B).
  • a punch 6 ( Figures 1C and 1D) is then moved downwardly with the disc edges trapped between the opposed surfaces of the draw pad 2 and draw die 3.
  • a cup 7 is thereby formed which is removed from the die by air pressure (see Figure 1E).
  • the cup 7 is then placed on a die 8 for first redraw purposes.
  • This stage is illustrated in Figure 2A.
  • the die is formed with a shaped lip 9 and has a curved annular projection 10 protruding inwardly from its upper surface.
  • the lip 9 and projection 10 can be seen more clearly from Figure 4.
  • a pressure sleeve 11 and punch 12 move downwardly and within the side wall of the cup 7.
  • the outer rim of the cup base seats between the opposed surfaces of the pressure sleeve 11 and the die 8.
  • the gap between these members is sufficient only to restrict movement of the cup 7, not to impose a force sufficient to deform or iron the cup.
  • the punch is moved downwardly, so the cup wall is stretched to increase cup height.
  • the can is to be shaped, this can be achieved by insertion of an expandable mandrel which, one expanded, imposes any required shape to the can. This is possible only because of the particular pre-coated laminated strip feedstock employed which has sufficient inherent formability to withstand the stretching and forming operation discussed without any loss of coating integrity.
  • Other can shaping processes including hydroforming can be employed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Glass Compositions (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Thermally Insulated Containers For Foods (AREA)
EP98302604A 1997-04-04 1998-04-02 Méthode de fabrication des boítes en métal et les boítes en métal fabriquées suivant cette méthode Expired - Lifetime EP0868951B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9706873 1997-04-04
GB9706873A GB2323803B (en) 1997-04-04 1997-04-04 A method of producing metal cans

Publications (3)

Publication Number Publication Date
EP0868951A2 true EP0868951A2 (fr) 1998-10-07
EP0868951A3 EP0868951A3 (fr) 1999-03-24
EP0868951B1 EP0868951B1 (fr) 2004-09-01

Family

ID=10810291

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98302604A Expired - Lifetime EP0868951B1 (fr) 1997-04-04 1998-04-02 Méthode de fabrication des boítes en métal et les boítes en métal fabriquées suivant cette méthode

Country Status (5)

Country Link
EP (1) EP0868951B1 (fr)
AT (1) ATE275013T1 (fr)
DE (1) DE69825930T2 (fr)
ES (1) ES2227772T3 (fr)
GB (2) GB2355679B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1165266A1 (fr) * 1999-02-10 2002-01-02 Chill-Can International, Inc. Procede de fabrication d'un recipient comprenant comme partie integrante une unite d'echange thermique
CN102275067A (zh) * 2011-08-02 2011-12-14 西安西工大超晶科技发展有限责任公司 一种航天器燃料用半球形金属贮箱的加工制备方法
CN110799281A (zh) * 2017-06-27 2020-02-14 现代制铁株式会社 热冲压零件及其制造方法

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AUPR144100A0 (en) * 2000-11-13 2000-12-07 Amcor Packaging (Australia) Pty Ltd Process for can manufacture
PL2739412T3 (pl) * 2011-08-01 2018-10-31 Crown Packaging Technology, Inc. Wytwarzanie puszek
DE102012102230B4 (de) 2012-03-16 2014-07-17 Thyssenkrupp Rasselstein Gmbh Verfahren zum Veredeln einer metallischen Beschichtung auf einem Stahlblech, beschichtetes Stahlblech, sowie Herstellungsverfahren für Dosen aus beschichtetem Stahlblech
DE102018114002A1 (de) 2018-06-12 2019-12-12 Gebrüder Leonhardt GmbH & Co. KG Blema Kircheis Verfahren und Vorrichtung zur Herstellung eines Behälters

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002577A1 (fr) * 1982-02-02 1983-08-04 Claydon, Paul, Charles Procede de façonnage de conteneurs
WO1992006804A1 (fr) * 1990-10-12 1992-04-30 Weirton Steel Corporation Production de boites en une seule piece par allongement controle de la paroi laterale
EP0680884A1 (fr) * 1994-05-02 1995-11-08 Toyo Seikan Kaisha Limited Boîtier sans joint, avec partie rétrécie

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1529061A (en) * 1976-06-23 1978-10-18 British Petroleum Co Forming process
JPS52124409A (en) * 1976-04-14 1977-10-19 Nippon Steel Corp Steel plate for hard metal case superior in flanging workability
US4952461A (en) * 1986-04-25 1990-08-28 Weirton Steel Company Composite-coated flat-rolled steel can stock and can product
JPS6314818A (ja) * 1986-07-05 1988-01-22 Nippon Steel Corp フランジ成形性に優れた缶用鋼板
JPH0757385B2 (ja) * 1989-06-13 1995-06-21 東洋製罐株式会社 被覆深絞り缶の製造方法
JPH07108706B2 (ja) * 1991-11-12 1995-11-22 東洋製罐株式会社 薄肉化絞り缶の製造方法
TW252961B (en) * 1994-02-15 1995-08-01 Toyo Seikan Kaisha Ltd Method of producing seamless cans
JP3575117B2 (ja) * 1995-06-06 2004-10-13 東洋製罐株式会社 耐食性と耐フレーバー性の優れた２ピース絞りしごき缶およびその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1983002577A1 (fr) * 1982-02-02 1983-08-04 Claydon, Paul, Charles Procede de façonnage de conteneurs
WO1992006804A1 (fr) * 1990-10-12 1992-04-30 Weirton Steel Corporation Production de boites en une seule piece par allongement controle de la paroi laterale
EP0680884A1 (fr) * 1994-05-02 1995-11-08 Toyo Seikan Kaisha Limited Boîtier sans joint, avec partie rétrécie

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1165266A1 (fr) * 1999-02-10 2002-01-02 Chill-Can International, Inc. Procede de fabrication d'un recipient comprenant comme partie integrante une unite d'echange thermique
EP1165266A4 (fr) * 1999-02-10 2003-06-25 Chill Can International Inc Procede de fabrication d'un recipient comprenant comme partie integrante une unite d'echange thermique
CN102275067A (zh) * 2011-08-02 2011-12-14 西安西工大超晶科技发展有限责任公司 一种航天器燃料用半球形金属贮箱的加工制备方法
CN110799281A (zh) * 2017-06-27 2020-02-14 现代制铁株式会社 热冲压零件及其制造方法

Also Published As

Publication number Publication date
GB9706873D0 (en) 1997-05-21
GB2355679B (en) 2001-09-19
ATE275013T1 (de) 2004-09-15
GB2355679A (en) 2001-05-02
DE69825930D1 (de) 2004-10-07
EP0868951B1 (fr) 2004-09-01
EP0868951A3 (fr) 1999-03-24
GB2323803A (en) 1998-10-07
ES2227772T3 (es) 2005-04-01
GB0029668D0 (en) 2001-01-17
GB2323803B (en) 2001-09-19
DE69825930T2 (de) 2005-09-29

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