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WO1998037995A1 - Extremite de boite metallique d'epaisseur reduite - Google Patents

Extremite de boite metallique d'epaisseur reduite Download PDF

Info

Publication number
WO1998037995A1
WO1998037995A1 PCT/US1997/013126 US9713126W WO9837995A1 WO 1998037995 A1 WO1998037995 A1 WO 1998037995A1 US 9713126 W US9713126 W US 9713126W WO 9837995 A1 WO9837995 A1 WO 9837995A1
Authority
WO
WIPO (PCT)
Prior art keywords
panel
steel
radius
seaming
chuckwall
Prior art date
Application number
PCT/US1997/013126
Other languages
English (en)
Inventor
Martin Mark Hubball
Original Assignee
Buhrke Tech International, 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 Buhrke Tech International, Inc. filed Critical Buhrke Tech International, Inc.
Publication of WO1998037995A1 publication Critical patent/WO1998037995A1/fr

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
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • B21D51/44—Making closures, e.g. caps

Definitions

  • Figure 3 illustrates an enlarged cross-sectional portion of the prior art can end having a profile or shape which has become the industry standard as providing the most desirable strength characteristics combined with the smallest can end size and gauge.
  • a can end shape commonly known as a B64 can end
  • U.S. Patent No. 4,031,837 to Jordan and U.S. Patent No. 4,735,863 to Bachmann et al One method of forming such a shape is disclosed in U.S. Patent No. 4,109,599 issued on August 29, 1978 to Schultz and assigned to the Aluminum Company of America (Alcoa) , and described in Alcoa's prior art B64 Reformed Shell Forming Process Report .
  • can ends for beer and beverage cans have been reduced to this industry standard size and has become close to the low end of acceptable limits of buckle pressure and tab/rivet and score formation considerations. Such considerations have prevented the industry from further reducing the size and thickness of the can end.
  • the present invention solves the problems of further reducing in size and thickness the can end for a beer and beverage container and fulfills a long felt need to do the same.
  • Figure 1 is a perspective view of a prior art can end
  • Figure 2 is a partial cross sectional view of the can end as seen from lines 2-2 of Figure 1 ;
  • Figure 5 is a cross sectional view of the apparatus used in the method of forming the can end of the present invention.
  • Figure 9 is an enlarged view of the circular window labeled
  • Figure 10 illustrates a partial cross sectional view of the apparatus used in the method of forming the can end of the present invention at a step subsequent to the step in Figure 8;
  • the thickness of the can end can be reduced from the industry standard of 0.0083 inches (0.2108 mm) for the aluminum can end to a thickness (t) of 0.0071 inches (0.1803 mm) for the steel can end, resulting in a gauge reduction of 0.0012 inches (0.0305 mm) in the can end.
  • the steel can end having the thickness of 0.0071 inches (0.1803 mm) adequately allows for the formation of the rivet without having the rivet crack when the tab is assembled to the panel 12.
  • the following chart sets forth the can end material tested (type or grade of steel), its thickness, and the highest pressure (measured in psi (parenthetical in KPa) ) applied to each sample can end tested (five of each) .
  • type or grade of material e.g. T-65
  • T-65 the letter "T” stands for tempered and the number is an industry designation of the hardness of the steel. The higher the number, the harder the steel, resulting in greater strength, but at the same time becoming harder to form.
  • T-65 and T-61 steel are the most common and are readily available. Other types or grades of steel are available but at higher costs.
  • T-65 and T-61 are European standards roughly corresponding to the American standard grades of T-5 and T-4 respectively. Material Thickness End #l End #2 End #3 End #4 End #5
  • the letter “B” following the psi value denotes that the sample end buckled at that pressure. Where the letter “B” is not present following the psi value, that psi value was the highest pressure achieve by the testing system during the test run and the can end did not buckle. As can be seen, all of the tested can ends were able to withstand the 95 psi (34.48 KPa) buckle pressure limit. However the sample can ends formed of T-61 steel having a thickness of 0.0071 inches (0.1803mm) allowed for the lowest acceptable buckle pressure and are thus preferred. Further such can ends allow for acceptable rivet/tab formation as well as proper scoring meeting acceptable "pop and tear" force standards .
  • the overall material needed to form a can end has been reduced from 2.856 cubic inches (46.801 cubic centimeters) of aluminum to 2.776 cubic inches (45.490 cubic centimeters) of steel.
  • the average manufacturing price of a standard industry aluminum can end of approximately $21,000,000 per one billion can ends has been reduced to an average manufacturing cost for each can end of the present invention of $18,000,000 per one billion can ends.
  • the overall savings in the production of one billion can ends results in substantial savings totaling $3,000,000.
  • the inventive method and apparatus for forming the improved can end of the present invention is disclosed.
  • the can end of the present invention is formed by the single action press apparatus 50 illustrated in Figure 5, comprising a punch assembly 60 and a die assembly 75.
  • Punch assembly 60 is comprised of a punch cut edge member 62 having a contact surface 62a, an upper clamp ring 64 having a contact surface 64a, and an inner form punch 66 having a contact surface 66a.
  • Punch cut edge member 62 and inner form punch 66 are suitably mounted to a punch holder 68 which can be selectively moved toward and away from die 75 by any suitable drive means 70 such as a motorized system of pulleys and belts selectively moving punch holder 68 via telescoping guide bars slidable along a series of roller pins.
  • Upper clamp ring 64 is positioned in a cavity 69 between punch cut edge member 62 and inner form punch 66 and is free to move vertically within cavity 69 by a suitable force means such as by a spring or pressurized air supplied to cavity 69 via air conduit 72, as will be described in more detail below.
  • Die assembly 75 is comprised of a die cut edge member 80 having a contact surface 80a, a lower draw ring 82 having a contact surface 82a, a lower form die 84 having a contact surface 84a, and a panel form die 86 having a contact surface 86a.
  • Lower form die is suitably mounted to a die holder 88.
  • Die cut edge member 80 is positioned upon a shoulder portion of lower form die 84.
  • Lower draw ring 82 is positioned in a cavity 90 between die cut edge member 80 and lower form die 84 and is free to move vertically within cavity 90 via a suitable force means such as air pressure supplied through air conduit 91, as will be described in more detail below.
  • Panel form die 86 is positioned in a cavity 92 inside lower form die 84 and is free to move vertically within cavity 92 via a suitable force means such as air pressure supplied through air conduit 93, as will be described in more detail below.
  • Figures 6 and 7 illustrate the initial step in forming the can end of the present invention wherein the can end blank 95 is cut from a sheet of steel 97.
  • Sheet of steel 97 is positioned over die assembly 75 upon contact surface 80a of die cut edge member 80, whereupon punch assembly 60 is lowered until contact surface 62a of punch cut edge member 62 contacts blank 95.
  • Zone 1 Figure 7
  • the punch assembly 60 continues downward to clamp blank 95 between contact surface 62a of punch cut edge member 62 and contact surface 82a of lower draw ring 82 at Zone 2 ( Figure 7) .
  • Figures 8 and 9 illustrate the subsequent step in the formation of the can end of the present invention wherein the chuckwall 20 and seaming panel 24 are formed.
  • Punch assembly 60 continues moving downward.
  • punch cut edge member 62 forces lower draw ring 82 downward in cavity 90
  • inner form punch 66 forces panel form die 86 downward in cavity 92.
  • inner form punch 66 is lowered, the panel 12 of blank 95 gets pressed downward between contact surface 66a and 86a, pulling seaming panel 24 out from between contact surfaces 62a and 82a, and into its illustrated position between contact surfaces 64a and 84a.
  • lower form die 84 prevents upper clamp ring 64 from moving downward, thus causing upper clamp ring 64 to have an upward movement in cavity 69 relative to punch cut edge member 62 and inner form punch 66 (as indicated by arrows) .
  • This above described movement results in the blank taking the form shown in Figure 9, having a chuckwall 20 and a seaming panel 24.
  • Figures 10 and 11 illustrate the subsequent step in the formation of the can end of the present invention wherein the panel wall 16 and countersink radius 18 are formed.
  • Punch assembly 60 begins to recede or move back, upwards and away from die assembly 75.
  • Upper clamp ring 64 remains m place to clamp seaming panel 24 with lower form die 84 at Zone 3 ( Figure 11) .
  • Panel form die 86 is moved upward in cavity 92 by a suitable force means such as by a spring or pressurized air supplied in cavity 92.
  • the blank 95 is reverse formed to create the panel wall 16 at Zone 4 ( Figure 11) , as well as the countersink radius 18.
  • Blank 95 remains clamped between inner form punch 66 and panel form die 86 at Zone 5 ( Figure 11), resulting in the formation of panel 12.
  • the desired panel depth Z is reached when panel form die 86 is stopped by lower form die 84 at Zone 6 ( Figure 10) .
  • the can end of the present invention is now formed.
  • Figures 12 and 13 illustrates the final step wherein the can end is ejected from the tooling area.
  • Punch assembly 60 continues to move back upwards and away from die assembly 75 until the entire can end is completely clear from the die assembly.
  • the seaming panel 24 of the can end remains held against the contact surface 64a of upper clamp ring 64 by light air pressure applied from a source below the can end, until an air blast from an air supply at the side of the can end separates the seaming panel from the upper clamp ring and ejects the can end from the tooling area.
  • the formed steel can end After being formed, the formed steel can end will continue to other stages in the manufacturing process to achieve a finished product, such as the forming of the curl 26, an electro-coating process, and the compound lining (gasketing) of the curl on the can end to prevent leakage in the seam between the can end and can.
  • a finished product such as the forming of the curl 26, an electro-coating process, and the compound lining (gasketing) of the curl on the can end to prevent leakage in the seam between the can end and can.
  • the can end Once finished, the can end is ready to be seamed to the sidewall of a can, such as a beer or beverage can.
  • a can such as a beer or beverage can.
  • the can end of the present invention could be reduced in diameter as well, resulting in further downsizing and downgauging of the can end and greater material costs savings.
  • other grades of steel could be used according to the principles of the present invention which may result in the ability to further downsize and downgauge the can end while maintaining the required pressure and structural considerations.
  • the can end 10 of the present invention and the method of formation thereof may be employed by industry to replace the current industry standard aluminum can end.
  • the present invention facilitates a can end 10 which requires less material to manufacture than an aluminum can end and which is capable of withstanding the pressures and rigors applied to a can end 10.
  • the can end 10 of the present invention presents particular advantages for cans constructed from steel in that the efforts required for recycling of the can end 10 and an associated can are greatly reduced by constructing each component of steel. The need to separate the can from the can end 10 prior to recycling is eliminated by the present invention 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Abstract

On décrit une extrémité de boîte métallique (10) destinée à fermer des canettes de bière ou autres boissons, qui présente une épaisseur réduite (t) et une profondeur derrière le panneau réduite (Z) d'une extrémité de boîte en aluminium, ce qui donne une profondeur unitaire réduite (Y). La taille et l'épaisseur réduites de cette boîte, obtenues sans compromettre les limites acceptables de fléchissement, les contraintes relatives à l'écrasement ou à la force de 'soulèvement et d'arrachage', permettent de réaliser des économies substantielles sur le coût des matières premières. L'extrémité de boîte métallique (10) est également résistante à l'amincissement de paroi-panneau (14) et de rayon de perçage conique (18) et peut ainsi être formé à partir d'une ébauche (95) circulaire ou ronde. On utilise un seul appareil et procédé à pression pour former par retournement l'extrémité de boîte métallique (10).
PCT/US1997/013126 1997-02-27 1997-07-25 Extremite de boite metallique d'epaisseur reduite WO1998037995A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US80776697A 1997-02-27 1997-02-27
US08/807,766 1997-02-27

Publications (1)

Publication Number Publication Date
WO1998037995A1 true WO1998037995A1 (fr) 1998-09-03

Family

ID=25197135

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/013126 WO1998037995A1 (fr) 1997-02-27 1997-07-25 Extremite de boite metallique d'epaisseur reduite

Country Status (1)

Country Link
WO (1) WO1998037995A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003057574A3 (fr) * 2001-12-27 2003-10-02 Alcoa Inc Coque d'extremite metallique et extremite de canette a ouverture facile pour canettes de biere et de boisson
CN100393443C (zh) * 2002-04-22 2008-06-11 皇冠包装技术公司 罐端
CN111050944A (zh) * 2017-08-30 2020-04-21 斯多里机械有限责任公司 与标准封罐机兼容的压力罐盖

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417898A (en) * 1965-10-20 1968-12-24 Continental Can Co Dual wall can end
US4448322A (en) * 1978-12-08 1984-05-15 National Can Corporation Metal container end
US4467933A (en) * 1981-10-16 1984-08-28 American Can Company Warp resistant closure for sanitary cans
US4991735A (en) * 1989-05-08 1991-02-12 Aluminum Company Of America Pressure resistant end shell for a container and method and apparatus for forming the same
EP0518613A1 (fr) * 1991-06-13 1992-12-16 CarnaudMetalbox plc Couvercles de boîtes et procédé de fabrication
WO1992022194A1 (fr) * 1991-06-17 1992-12-23 Reynolds Metals Company Procede et appareil de formage d'extremites de boites metalliques
US5590807A (en) * 1992-10-02 1997-01-07 American National Can Company Reformed container end

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3417898A (en) * 1965-10-20 1968-12-24 Continental Can Co Dual wall can end
US4448322A (en) * 1978-12-08 1984-05-15 National Can Corporation Metal container end
US4467933A (en) * 1981-10-16 1984-08-28 American Can Company Warp resistant closure for sanitary cans
US4991735A (en) * 1989-05-08 1991-02-12 Aluminum Company Of America Pressure resistant end shell for a container and method and apparatus for forming the same
EP0518613A1 (fr) * 1991-06-13 1992-12-16 CarnaudMetalbox plc Couvercles de boîtes et procédé de fabrication
WO1992022194A1 (fr) * 1991-06-17 1992-12-23 Reynolds Metals Company Procede et appareil de formage d'extremites de boites metalliques
US5590807A (en) * 1992-10-02 1997-01-07 American National Can Company Reformed container end

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003057574A3 (fr) * 2001-12-27 2003-10-02 Alcoa Inc Coque d'extremite metallique et extremite de canette a ouverture facile pour canettes de biere et de boisson
US6761280B2 (en) 2001-12-27 2004-07-13 Alcon Inc. Metal end shell and easy opening can end for beer and beverage cans
CN100393443C (zh) * 2002-04-22 2008-06-11 皇冠包装技术公司 罐端
CN111050944A (zh) * 2017-08-30 2020-04-21 斯多里机械有限责任公司 与标准封罐机兼容的压力罐盖

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