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EP2558229A1 - Fabrication de récipients en métal - Google Patents

Fabrication de récipients en métal

Info

Publication number
EP2558229A1
EP2558229A1 EP11714289A EP11714289A EP2558229A1 EP 2558229 A1 EP2558229 A1 EP 2558229A1 EP 11714289 A EP11714289 A EP 11714289A EP 11714289 A EP11714289 A EP 11714289A EP 2558229 A1 EP2558229 A1 EP 2558229A1
Authority
EP
European Patent Office
Prior art keywords
cup
draw
base
punch
stretch
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.)
Withdrawn
Application number
EP11714289A
Other languages
German (de)
English (en)
Inventor
Stuart Monro
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 Technology Inc
Original Assignee
Crown Packaging Technology Inc
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 Crown Packaging Technology Inc filed Critical Crown Packaging Technology Inc
Priority to EP11714289A priority Critical patent/EP2558229A1/fr
Publication of EP2558229A1 publication Critical patent/EP2558229A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B21D22/24—Deep-drawing involving two drawing operations having effects in opposite directions with respect to the blank
    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • 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
    • B21D25/00—Working sheet metal of limited length by stretching, e.g. for straightening
    • B21D25/04—Clamping arrangements
    • 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
    • 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

Definitions

  • This invention relates to the production of metal cups and in particular (but without limitation) to metal cups suitable for the production of "two-piece" metal containers.
  • US 4095544 (NATIONAL STEEL CORPORATION) 20/06/1978 details conventional Draw & Wall Ironing (DWI) and Draw & Re-Draw (DRD) processes for manufacturing cup-sections for use in making two-piece metal containers.
  • DWI Draw & Wall Ironing
  • DWI Draw & Re-Draw
  • the term "two-piece” refers to i) the cup-section and ii) the closure that would be subsequently fastened to the open end of the cup-section to form the container.
  • a flat (typically) circular blank stamped out from a roll of metal sheet is drawn though a drawing die, under the action of a punch, to form a shallow first stage cup.
  • This initial drawing stage does not result in any intentional thinning of the blank.
  • the cup which is typically mounted on the end face of a close fitting punch or ram, is pushed through one or more annular wall-ironing dies for the purpose of effecting a reduction in thickness of the sidewall of the cup, thereby resulting in an elongation in the sidewall of the cup.
  • the ironing process will not result in any change in the nominal diameter of the first stage cup.
  • Figure 1 shows the distribution of metal in a container body resulting from a conventional DWI (D&l) process.
  • Figure 1 is illustrative only, and is not intended to be precisely to scale. Three regions are indicated in figure 1 :
  • Region 1 represents the un-ironed material of the base. This remains approximately the same thickness as the ingoing gauge of the blank, i.e. it is not affected by the separate manufacturing operations of a conventional DWI process.
  • Region 2 represents the ironed mid-section of the sidewalk Its thickness (and thereby the amount of ironing required) is determined by the performance required for the container body.
  • Region 3 represents the ironed top-section of the sidewalk Typically in can making, this ironed top-section is around 50-75% of the thickness of the ingoing gauge.
  • a combination of ironing and re-drawing may be used on the first stage cup, which thereby reduces both the cup's diameter and sidewall thickness.
  • the container body is typically made by drawing a blank into a first stage cup and subjecting the cup to a number of re-drawing operations until arriving at a container body of the desired nominal diameter, then followed by ironing the sidewall to provide the desired sidewall thickness and height.
  • the thickness of the base remains broadly unchanged from that of the ingoing gauge of the blank. This can result in the base being far thicker than required for performance purposes.
  • the metal packaging industry is fiercely competitive, with weight reduction being a primary objective because it reduces transportation and raw material costs.
  • weight reduction By way of example, around 65% of the costs of manufacturing a typical two-piece metal food container derive from raw material costs.
  • cup-section and “cup” are used interchangeably.
  • a method for manufacture of a metal cup from a metal sheet comprising the following operations:
  • a drawing operation comprising drawing the metal sheet into a cup having a sidewall and an integral base
  • a stretching operation performed on the cup comprising clamping an annular region on the base of the cup to define an enclosed portion, and deforming and stretching at least part of the base that lies within the enclosed portion to thereby increase the surface area and reduce the thickness of the base, the annular clamping adapted to restrict or prevent metal flow from the clamped region into the enclosed portion during this stretching operation;
  • a press for manufacture of a metal cup from a metal sheet comprising: i. means for drawing the metal sheet into a cup having a sidewall and an integral base;
  • a clamping element for clamping the drawn cup during a stretching operation, the clamping element adapted to clamp an annular region on the base of the drawn cup to define an enclosed portion
  • a stretch tool adapted to deform and stretch at least part of the base that lies within the enclosed portion in the stretching operation to thereby increase the surface area and reduce the thickness of the base, the clamping element further adapted to restrict or prevent metal flow from the clamped region into the enclosed portion during the stretching operation.
  • the invention enables cost savings to be made of the order of several dollars per 1 ,000 containers relative to existing manufacturing techniques.
  • the base of the drawn cup is clamped sufficiently to restrict or prevent metal flow from the clamped region into the enclosed portion during the stretching operation. If the clamping loads are insufficient, material from the clamped region (or from outside of the clamped region) would merely be drawn into the enclosed portion, rather than the enclosed portion (and the cup's base) undergoing any thinning. It has been found that stretching and thinning can still occur when permitting a limited amount of flow of material from the clamped region (or from outside of the clamped region) into the enclosed portion, i.e. when metal flow is restricted rather than completely prevented.
  • the method and apparatus of the invention is particularly suitable for use in the manufacture of metal containers, with the final resulting cup being used for the container body.
  • the final resulting cup may be formed into a closed container by the fastening of a closure to the open end of the cup.
  • a metal can end may be seamed to the open end of the final resulting cup.
  • typically the cup resulting from the method of the invention would be subjected to either or a combination of a re-drawing operation and an ironing operation.
  • the re-drawing operation may comprise one or more stages, each stage having the effect of inducing a staged reduction in cup diameter.
  • the ironing operation would have the benefit of increasing the height of the sidewall of the cup produced by the method and apparatus of the invention.
  • the stretching operation comprises deforming and stretching at least part of the base that lies within the enclosed portion into a domed profile.
  • the base of the container body In the field of metal containers for carbonated beverages, it is common for the base of the container body to be inwardly-domed to resist pressure generated by the product.
  • the "dome" provided by the method and apparatus of the invention may serve as the inwardly-domed region of a beverage container body.
  • the cup would undergo a later reforming operation to provide the domed base of the cup with a desired final profile necessary to resist in-can pressure.
  • the method of the invention is suitable for use on cups that are both round and non-round in plan. However, it works best on round cups.
  • the graph also shows the effect of reducing the thickness of the top and mid-wall sections of the container in driving down the cost curve.
  • Figure 3 shows the same graph based upon actual data for UK- supplied tinplate of the type commonly used in can-making. For the material illustrated in figure 3, 0.285 mm represents the optimum thickness on cost grounds, with the use of thinner gauge material increasing net overall costs for can production. The graph of figure 3 shows the percentage increase in overall cost per 1 ,000 cans when deviating from the 0.285 mm optimum ingoing gauge thickness.
  • the final resulting cup of the invention has the benefits of a thinner (and therefore lighter) base.
  • the "metal sheet” can include a blank cut from a larger expanse of metal sheet.
  • annular clamping or clamping an “annular region” is meant that the base of the drawn cup is clamped either continuously or at spaced intervals in an annular manner.
  • the clamping element may be in the form of a continuous annular sleeve; alternatively, it may be a collection of discrete clamping elements distributed in an annular manner to act against the metal sheet.
  • the method and apparatus of the invention are not limited to a particular metal. They are particularly suitable for use with any metals commonly used in DWI (D&l) and DRD processes. Also, there is no limitation on the end use of the cup that results from the method and apparatus of the invention. Without limitation, the cups may be used in the manufacture of any type of container, whether for food, beverage or anything else.
  • Figure 1 is a side elevation view of a container body of the background art resulting from a conventional DWI process. It shows the distribution of material in the base and sidewall regions of the container body.
  • Figure 2 is a graph showing in general terms how the net overall cost of manufacturing a typical two-piece metal container varies with the ingoing gauge of the sheet metal. The graph shows how reducing the thickness of the sidewall region (e.g. by ironing) has the effect of driving down the net overall cost.
  • Figure 3 is a graph corresponding to figure 2, but based on actual price data for UK-supplied tinplate.
  • Figure 4 is a cross-section through a press of the invention showing a blank of metal sheet prior to the drawing and stretching operations.
  • Figure 5 is a cross-section through the press of figure 4, but after the
  • drawing operation to draw the blank of metal sheet into a cup having a sidewall and integral base.
  • Figure 6 is a cross-section through the press of figures 4 and 5, but after the stretching operation to deform and stretch the base of the drawn cup.
  • Figure 4 shows a combined drawing and stretching press 10.
  • a blank of metal sheet 5 is "slidably clamped” in position between the opposing surfaces of a draw pad 1 1 and an end face of a draw die 12.
  • a draw punch 13 is located above the upper surface of the blank of metal sheet 5 Within the bore defined by the draw die 12 is a stretch punch 14 which is radially-inwards of and surrounded by annular clamping element 15.
  • the draw punch 13 is moved axially downwards (along axis 16) until the peripheral annular region 17 of the end face of the punch contacts a corresponding region on the blank 5 (see figure 5).
  • the draw punch 13 is urged downwards through the bore of the draw die 12 to progressively draw the initially planar blank 5 into a cup 30 having a sidewall 31 and integral base 32.
  • slidably clamping is meant that the clamping load during drawing is selected so as to permit the metal sheet 5 to slide, relative to whatever clamping means is used (in this case a "draw pad 1 1 "), in response to the deforming action of the draw punch 13 / draw die 12 on the metal sheet.
  • a clamping means in this case a "draw pad 1 1 "
  • An intention of this slidable clamping is to prevent or restrict wrinkling of the material during drawing.
  • annular clamping element 15 is moved axially upwards until an annular region 33 on the base 32 of the drawn cup is clamped between the annular clamping element and the peripheral annular region 17 of the end face of the draw punch 13 (see figure 5).
  • the material of the cup's base enclosed by this annular clamping is referred to as the "enclosed portion" 34.
  • Stretch punch 14 is then moved axially upwards (along axis 16) to contact the enclosed portion 34 (see figure 6).
  • the stretch punch 14 is urged upwards into the recess 18 defined within the end face of the draw punch 13 to progressively deform and stretch the material of the enclosed portion 34 of the cup 30 into a domed profile 35 (see figure 6).
  • the clamping load applied between the annular clamping element 15 and the peripheral annular region 17 of the end face of the draw punch 13 is sufficient to restrict or prevent metal flow from the clamped annular region 33 into the enclosed portion 34 during this stretching operation.
  • the end face of the annular clamping element 15 may be textured (not shown in the figures) to thereby allow use of a reduced clamping load compared to use of an annular clamping element having a smooth polished end face.
  • the cup that results from the stretching operation performed in press 10 has a reduced thickness in its base relative to the ingoing gauge of the blank of metal sheet 5.
  • this cup may be used as a container body, but would generally be subjected to either or a combination of redrawing and ironing operations to optimise the cup diameter and sidewall thickness.
  • the domed region 35 may be particularly beneficial for containers intended for pressurised products, such as carbonated beverages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Stackable Containers (AREA)
  • Laminated Bodies (AREA)

Abstract

La méthode et le dispositif ci-décrits sont destinés à une utilisation pour la fabrication de récipients métalliques en deux parties. Plus particulièrement, une presse produisant des sections de gobelets à partir d'une tôle en combinant des opérations d'étirage et de laminage est divulguée. Les gobelets ainsi produits présentent l'avantage de posséder une épaisseur de base moindre, comparativement à l'épaisseur initiale de la tôle.
EP11714289A 2010-04-13 2011-04-13 Fabrication de récipients en métal Withdrawn EP2558229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11714289A EP2558229A1 (fr) 2010-04-13 2011-04-13 Fabrication de récipients en métal

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP10159826 2010-04-13
PCT/EP2011/055847 WO2011128385A1 (fr) 2010-04-13 2011-04-13 Fabrication de récipients en métal
EP11714289A EP2558229A1 (fr) 2010-04-13 2011-04-13 Fabrication de récipients en métal

Publications (1)

Publication Number Publication Date
EP2558229A1 true EP2558229A1 (fr) 2013-02-20

Family

ID=42752975

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11714289A Withdrawn EP2558229A1 (fr) 2010-04-13 2011-04-13 Fabrication de récipients en métal

Country Status (14)

Country Link
US (3) US20130098926A1 (fr)
EP (1) EP2558229A1 (fr)
JP (1) JP5952804B2 (fr)
CN (1) CN102834195A (fr)
AU (1) AU2011239981B2 (fr)
BR (1) BR112012026177A2 (fr)
CA (1) CA2794120C (fr)
CO (1) CO6630100A2 (fr)
MX (1) MX2012011886A (fr)
NZ (1) NZ603524A (fr)
RU (1) RU2567077C2 (fr)
UA (1) UA112058C2 (fr)
WO (1) WO2011128385A1 (fr)
ZA (1) ZA201208514B (fr)

Families Citing this family (14)

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US10525519B2 (en) 2009-10-21 2020-01-07 Stolle Machinery Company, Llc Container, and selectively formed cup, tooling and associated method for providing same
GB201205243D0 (en) 2012-03-26 2012-05-09 Kraft Foods R & D Inc Packaging and method of opening
GB2511560B (en) 2013-03-07 2018-11-14 Mondelez Uk R&D Ltd Improved Packaging and Method of Forming Packaging
GB2511559B (en) 2013-03-07 2018-11-14 Mondelez Uk R&D Ltd Improved Packaging and Method of Forming Packaging
GB201306765D0 (en) * 2013-04-12 2013-05-29 Crown Packaging Technology Inc Method and apparatus for manufacturing a can end
MX2016009371A (es) * 2014-03-28 2016-10-13 Nippon Steel & Sumitomo Metal Corp Metodo para manufacturar un componente formado en forma de lamina teniendo multiples secciones de grosor incrementado, y componente formado en forma de lamina teniendo multiples secciones de grosor incrementado.
EP3206810A4 (fr) 2014-10-15 2018-05-23 Ball Corporation Appareil et procédé pour former une épaule et un col d'un contenant métallique
BR112017007236A2 (pt) 2014-10-28 2017-12-12 Ball Corp aparelho e método para formar uma cuba com um fundo reformado
US20170267408A1 (en) * 2015-12-21 2017-09-21 Bill Martinez Dry Cup
US10286437B2 (en) * 2016-02-04 2019-05-14 Crown Packaging Technology, Inc. Anti-wrinkling tooling assembly for a can bodymaker
PL3219402T3 (pl) 2016-03-15 2020-05-18 Can - Pack S.A. Sposób kształtowania wytłoczek do wytwarzania opakowań
CN106216552A (zh) * 2016-07-22 2016-12-14 苏玲 金属罐的制造方法
JP2019534789A (ja) * 2016-10-06 2019-12-05 ストール マシーナリ カンパニー, エルエルシーStolle Machinery Company, LLC 容器、及び選択的に形成されるカップ、ツーリング、並びにこれらを提供する関連方法
WO2018165429A1 (fr) * 2017-03-08 2018-09-13 Ball Corporation Appareil et procédé de ré-étirage de coupelle ayant un fond reformé

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Also Published As

Publication number Publication date
CA2794120A1 (fr) 2011-10-20
JP5952804B2 (ja) 2016-07-13
WO2011128385A1 (fr) 2011-10-20
BR112012026177A2 (pt) 2016-06-28
MX2012011886A (es) 2012-11-30
CO6630100A2 (es) 2013-03-01
ZA201208514B (en) 2013-09-25
US20150283597A1 (en) 2015-10-08
US20130037555A1 (en) 2013-02-14
UA112058C2 (uk) 2016-07-25
JP2013523460A (ja) 2013-06-17
NZ603524A (en) 2013-10-25
CA2794120C (fr) 2018-04-03
CN102834195A (zh) 2012-12-19
RU2012148040A (ru) 2014-05-20
AU2011239981B2 (en) 2016-08-11
AU2011239981A1 (en) 2012-11-29
RU2567077C2 (ru) 2015-10-27
US20130098926A1 (en) 2013-04-25

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