EP0103074A2 - Erlangung erhöhter Steifigkeit für Metalldeckel durch Umstülpen gekrümmter Abschnitte - Google Patents

Erlangung erhöhter Steifigkeit für Metalldeckel durch Umstülpen gekrümmter Abschnitte Download PDF

Info

Publication number
EP0103074A2
EP0103074A2 EP83105729A EP83105729A EP0103074A2 EP 0103074 A2 EP0103074 A2 EP 0103074A2 EP 83105729 A EP83105729 A EP 83105729A EP 83105729 A EP83105729 A EP 83105729A EP 0103074 A2 EP0103074 A2 EP 0103074A2
Authority
EP
European Patent Office
Prior art keywords
closure
wall
center panel
reversing
panel
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Withdrawn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
EP83105729A
Other languages
English (en)
French (fr)
Other versions
EP0103074A3 (de
Inventor
Tuan Anh Nguyen
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.)
Ball Corp
Original Assignee
Ball 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 Ball Corp filed Critical Ball Corp
Publication of EP0103074A2 publication Critical patent/EP0103074A2/de
Publication of EP0103074A3 publication Critical patent/EP0103074A3/de
Withdrawn legal-status Critical Current

Links

Images

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
    • B21D51/383—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures scoring lines, tear strips or pulling tabs
    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/06—Integral, or permanently secured, end or side closures
    • B65D17/08—Closures secured by folding or rolling and pressing

Definitions

  • the present invention relates generally to container ends and more particularly to an improved end for a pressurized container and method of forming such end.
  • the configuration of ends conventionally used to close drawn and ironed beer and beverage cans comprises a center panel, a grooved portion surrounding the center panel and bounded on the inside by an integral inner wall and on the outside by an integral chuckwall, a first curved segment at the bottom of the groove joining the inner wall and the chuckwall, a second curved segment joining the center panel to the inner wall, and a peripheral curl at the upper end of the chuckwall for securing the closure to a can body.
  • a metal container closure of the usual type is strengthened by reversing a portion of the second curved segment to provide at least three reversing curved segments integrally joining the center panel to the inner wall.
  • a die and punch arrangement is placed respectively under and over a standard closure.
  • the working surface of the die includes a first concave portion located underneath the second arcuate segment of the closure.
  • the first concave portion extends upwardly to a vertical first sidewall which terminates in a first convex portion which is adjacent the closure and inwardly of the second arcuate segment.
  • An inwardly extending second horizontal portion is connected thereto. Outside the first concave portion is an integrally connected first horizontal portion which terminates in a second convex portion which terminates in a substantially vertical plane.
  • a second downwardly extending sidewall may be integrally connected to the lower part of said second convex portion.
  • the working surface of the punch includes a third convex portion which substantially matches with said first concave portion of said die and is located to accomplish the metal forming requirement when the punch and die are brought together in working position.
  • the third convex portion terminates upwardly in a vertical third sidewall and outwardly in a third horizontal portion.
  • a second concave portion which substantially matches with the second convex portion of said die is integrally connected to the outside of said third horizontal portion.
  • the second concave portion of the working surface of the punch terminates in a downwardly extending ring-like member which mates with the first arcuate segment of the closure.
  • the ring-like member includes fourth and fifth sidewall portions which are integrally connected at the lower end by a fourth convex portion which is constructed to fit the countersink portion of the closure.
  • a closure is placed between the die and punch.
  • the die and'punch are then moved into working position whereby the third convex portion of the punch contacts and reverses the second arcuate segment of the closure.
  • the closure is formed around the first and second convex portions of the die and the third convex portion of the punch resulting in a reduction in the diameter of the center panel, a slight increase in the panel height, the provision of three reversing curved segments between the inner wall and the center panel and an increased stiffness for such three reversing curved segments due to work hardening.
  • a particular advantage of the present invention is its applicability to the great majority of now produced lightweight closures without significantly altering the critical dimensions of such closures thereby requiring no alterations in customers handling equipment..
  • the preferred embodiment described hereinafter is a standard end of the ring pull type. It is understood that the method described in this patent applies to all types and.sizes of ends manufactured for metal beer and soft drink containers.
  • FIG. 1 a metal container end 10 of the easy open type.
  • the end 10 is of conventional construction and is provided with a tear portion 12 defined by a score line 14. As shown in the. preferred embodiment, the tear portion is removed by means of a pull tab 16 functionally connected to the tear portion 12 by the usual rivet 18.
  • the end 10 includes a substantially flat center panel 20 surrounded by an annular grooved portion or countersink 21.
  • the annular grooved portion is bounded on the inside by an inner panel wall 24 and on the outside by a chuckwall 26.
  • the chuckwall 26 and inner wall 24 are integrally joined at the bottom of the countersink by an upwardly bowed first arcuate segment 22, having a radius of R1.
  • the inner wall extends upwardly and inwardly at an angle A from vertical and is integrally joined to the center panel 20 by a downwardly bowed second arcuate segment.25, having a radius of R2.
  • the end has a dome depth "M" measured from the rivet to the uppermost portion of the curl 28 and a'panel height H, measured from the bottom of the grooved portion to the bottom of the center panel 20 adjacent the second arcuate segment 25.
  • the working surface 44 of the die includes a first concave portion 45, having a radius of R4, which terminates in an upwardly extending first sidewall 49 and an outwardly extending first horizontal portion 55.
  • the first sidewall 49 terminates in a first convex portion 47, having a radius R3, which may be integrally joi ' ned to an inwardly extending second horizontal portion 51.
  • a second convex portion 53, having a radius R5 is integrally joined to the outwardly extending first horizontal portion 55 and said second convex portion 53 has a downwardly extending second sidewall 57.
  • the working surface 58 of punch 41 includes a third convex portion 59, having a radius R6, shaped and aligned for matching with first concave portion 45 on die 43.
  • third convex portion 59 terminates in an upwardly extending vertical third sidewall 61 and outwardly, third convex portion 59 terminates in an outwardly extending third horizontal portion 63.
  • a downwardly extending ring-like member 64 is integrally attached to the punch outward of said third horizontal portion 63 and includes a second concave portion 65, having a radius R7, which is matable with second convex portion 53 of die 43.
  • the ring-like member further includes vertical fourth and fifth sidewalls, respectively referenced 66 and 69, and a fourth convex portion 67, having a radius R8, which is shaped to conform to the countersink of closure 10.
  • the outermost portion of the substantially flat center panel 20, as indicated by dotted line X, is moved inwardly to the dotted line referenced X' thereby reducing the overall substantially flat center panel diameter.
  • the eversion resistance of the closure may be further increased by further lowering the punch such that third horizontal portion 63 coins the substantially flat portion of the closure limited by reversing curves 30 and 31.
  • FIG. 6 illustrates an enlarged view of the reversed segments of reformed closure 10.
  • each of the segments 30, 31 and 32 cover an arc of about 90 degrees with segment 30 starting at angle A from vertical and providing a transition to about the horizontal, segment 31 starting at about the horizontal and providing a transition to about the vertical and segment 32 starting at about the vertical and providing a second transition back to about the horizontal.
  • the radii of the reversing segments and the radii of R3 through R7 on the punch and die are between about 0.015 and about 0.010 inches, or preferably, the radii of reversing segments 30 and 32, respectively R9 and R11, are about 0.015 inches and the radii of reversing segment 31, R10, is about 0.010 inches.
  • the height of the first transition to horizontal from the bottom of groove 22 is referenced B and the height from said first transition to the center panel is referenced C.
  • the decrease in diameter which the center panel will experience is approximately equal to twice the distance between lines X and X' in Figure 4, which is referenced D.
  • Representative figures for B and C in Figure 6, and D in Figure 4 are respectively, 0.040 + 0.010 inches, 0.020 + 0.10 inches and 0.035 + 0.005 inches. The above would indicate a decrease in center panel diameter of as much as 0.080 inches.
  • the substantially flat portion of the closure between reversing segments 30 and 31 may be coined for added strength to a residual of between about 0.008 inches and about 0.009 inches when reforming a closure which has a thickness of about 0.0122.
  • a standard shell or closure may be strengthened by reversing the second arcuate segment connecting the inner wall to the outer panel and decreasing the diameter of the center panel. This is accomplished by placing a die and punch under and over the closure.
  • the die having a first concave portion and first and second convex portion of substantially the final shape which is desired.
  • the punch is provided with a third convex portion in register with the first concave portion of the die.
  • the die and punch are then brought into working position causing the third convex portion of the punch to form the second arcuate segment and the upper portion of the inner wall and the outer portion of the center panel around the first and second convex portions of the die resulting in a reversal of the second arcuate segment, a decrease in dome.diameter and a straightening of the inner wall.
  • These effects are accompanied by a slight doming of the center panel and a work hardening of the resulting three reversing segments of the closure.
  • the smaller the radii of the three reversing segments of the closure the greater the strength; however, if such radii are too small, failure of the closure will be a problem due to fracturing along the radii.
  • An optimum compromise has been achieved where said first and second convex portions of the die have radii of about 0.015 inches and said third convex portion of the punch has a radius of about 0.010 inches.
  • the present invention relates to strengthening a standard closure by reversing the arcuate segment of the closure which joins the center panel to the inner wall. This is preferably accomplished by placing a first downwardly bowed annular forming surface underneath the closure and inwardly from said arcuate segment, placing a second downwardly bowed annular forming surface underneath the closure and upwardly from the bottom of the countersink and moving a third upwardly bowed annular forming surface, from above the closure, downwardly against said arcuate segment causing the reversal of said arcuate segment and the-formation of three reversing segments in conformance with said first and second downwardly bowed annular forming surfaces and said third upwardly bowed annular forming surface.
  • the reformed closure will have a slight dome, with a decreased dome depth, a straightened sidewall and an increase in buckle resistance of about 8 to about 10 percent.
  • the dimensional characteristics of the reversed closure will .be substantially identical to a standard closure except that a thinner gauge of material may be used with its attendant cost savings.
  • the decreased dome depth may be minimized by clamping a portion of the center panel in the horizontal during the working process.
  • An additional advantage of the present invention is that it may easily be instituted in many now-used conversion presses with minimal alterations and an almost insignificant increase in press tonnage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
EP83105729A 1982-09-09 1983-06-10 Erlangung erhöhter Steifigkeit für Metalldeckel durch Umstülpen gekrümmter Abschnitte Withdrawn EP0103074A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US41619882A 1982-09-09 1982-09-09
US416198 1982-09-09

Publications (2)

Publication Number Publication Date
EP0103074A2 true EP0103074A2 (de) 1984-03-21
EP0103074A3 EP0103074A3 (de) 1984-05-23

Family

ID=23648984

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105729A Withdrawn EP0103074A3 (de) 1982-09-09 1983-06-10 Erlangung erhöhter Steifigkeit für Metalldeckel durch Umstülpen gekrümmter Abschnitte

Country Status (3)

Country Link
EP (1) EP0103074A3 (de)
JP (1) JPS5962444A (de)
AU (1) AU1618683A (de)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0497346A1 (de) * 1991-01-30 1992-08-05 The Stolle Corporation Druckbeständiger Endverschluss aus Blech
US5527143A (en) * 1992-10-02 1996-06-18 American National Can Company Reformed container end
US5590807A (en) * 1992-10-02 1997-01-07 American National Can Company Reformed container end
US6024239A (en) * 1997-07-03 2000-02-15 American National Can Company End closure with improved openability
WO2003035494A1 (en) * 2001-10-19 2003-05-01 Rexam Beverage Can Company Reformed can end and method therefore
US8490825B2 (en) 1999-12-08 2013-07-23 Metal Container Corporation Can lid closure and method of joining a can lid closure to a can body
WO2014062873A1 (en) * 2012-10-18 2014-04-24 Stolle Machinery Company, Llc End closure with coined panel radius and reform step
US9566634B2 (en) 2010-06-07 2017-02-14 Rexam Beverage Can Company Can end produced from downgauged blank
US9821928B2 (en) 2012-05-14 2017-11-21 Rexam Beverage Can Company Can end

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ210588A (en) * 1984-01-16 1988-01-08 Dayton Reliable Tool & Mfg Co Shell used in manufacture of can ends: non-circular blank having rounded corners is cut from sheet metal
JPH0211033U (de) * 1988-07-04 1990-01-24
JP5042941B2 (ja) * 2008-08-11 2012-10-03 ユニバーサル製缶株式会社 缶蓋
JP5186026B2 (ja) * 2011-06-24 2013-04-17 ユニバーサル製缶株式会社 缶蓋の製造方法
CN109158504A (zh) * 2018-11-08 2019-01-08 苏州斯莱克精密设备股份有限公司 冲压装置和多通道罐盖冲压系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441170A (en) * 1967-03-03 1969-04-29 Continental Can Co Coined bead for improved fill characteristics
US3774801A (en) * 1971-02-22 1973-11-27 American Can Co Reinforced metal can end
DE2532194A1 (de) * 1974-07-23 1976-02-05 Continental Can Co Verfahren und vorrichtung zum verformen eines aufreissdeckels aus metall
US4093102A (en) * 1974-08-26 1978-06-06 National Can Corporation End panel for containers
DE2820514A1 (de) * 1977-05-17 1978-11-23 Ferembal Sa Tiefziehboden fuer metallische verpackungen
US4217843A (en) * 1977-07-29 1980-08-19 National Can Corporation Method and apparatus for forming ends
GB2051646A (en) * 1979-06-26 1981-01-21 Continental Group Container produced by triple drawn method using tin coated steel

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3441170A (en) * 1967-03-03 1969-04-29 Continental Can Co Coined bead for improved fill characteristics
US3774801A (en) * 1971-02-22 1973-11-27 American Can Co Reinforced metal can end
DE2532194A1 (de) * 1974-07-23 1976-02-05 Continental Can Co Verfahren und vorrichtung zum verformen eines aufreissdeckels aus metall
US4093102A (en) * 1974-08-26 1978-06-06 National Can Corporation End panel for containers
DE2820514A1 (de) * 1977-05-17 1978-11-23 Ferembal Sa Tiefziehboden fuer metallische verpackungen
US4217843A (en) * 1977-07-29 1980-08-19 National Can Corporation Method and apparatus for forming ends
GB2051646A (en) * 1979-06-26 1981-01-21 Continental Group Container produced by triple drawn method using tin coated steel

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0497346A1 (de) * 1991-01-30 1992-08-05 The Stolle Corporation Druckbeständiger Endverschluss aus Blech
US5149238A (en) * 1991-01-30 1992-09-22 The Stolle Corporation Pressure resistant sheet metal end closure
US5527143A (en) * 1992-10-02 1996-06-18 American National Can Company Reformed container end
US5590807A (en) * 1992-10-02 1997-01-07 American National Can Company Reformed container end
US5598734A (en) * 1992-10-02 1997-02-04 American National Can Company Reformed container end
US6024239A (en) * 1997-07-03 2000-02-15 American National Can Company End closure with improved openability
US8490825B2 (en) 1999-12-08 2013-07-23 Metal Container Corporation Can lid closure and method of joining a can lid closure to a can body
CN1326752C (zh) * 2001-10-19 2007-07-18 雷克萨姆饮料罐公司 再成型的罐端部及其制造方法
US6748789B2 (en) 2001-10-19 2004-06-15 Rexam Beverage Can Company Reformed can end for a container and method for producing same
AU2002347836B2 (en) * 2001-10-19 2007-12-20 Rexam Beverage Can Company Reformed can end and method therefore
US7748563B2 (en) 2001-10-19 2010-07-06 Rexam Beverage Can Company Reformed can end for a container and method for producing same
WO2003035494A1 (en) * 2001-10-19 2003-05-01 Rexam Beverage Can Company Reformed can end and method therefore
US9566634B2 (en) 2010-06-07 2017-02-14 Rexam Beverage Can Company Can end produced from downgauged blank
US10486852B2 (en) 2010-06-07 2019-11-26 Rexam Beverage Can Company Can end produced from downgauged blank
US9821928B2 (en) 2012-05-14 2017-11-21 Rexam Beverage Can Company Can end
US11174069B2 (en) 2012-05-14 2021-11-16 Rexam Beverage Can Company Can end
WO2014062873A1 (en) * 2012-10-18 2014-04-24 Stolle Machinery Company, Llc End closure with coined panel radius and reform step
US10967412B2 (en) 2012-10-18 2021-04-06 Stolle Machinery Company, Llc End closure with coined panel radius and reform step

Also Published As

Publication number Publication date
AU1618683A (en) 1984-03-15
EP0103074A3 (de) 1984-05-23
JPS5962444A (ja) 1984-04-09

Similar Documents

Publication Publication Date Title
EP0088968B1 (de) Verfahren zum Veiterverformen eines Metalldeckels und ein Metalldeckel
US4577774A (en) Buckle resistance for metal container closures
US10843845B2 (en) Can shell and double-seamed can end
US20220063864A1 (en) Can end
EP0497346B1 (de) Druckbeständiger Endverschluss aus Blech
US4031837A (en) Method of reforming a can end
US5527143A (en) Reformed container end
AU599143B2 (en) Method and apparatus for forming end panels for containers and end panels formed thereby
US4641761A (en) Increased strength for metal beverage closure through reforming
US7819275B2 (en) Can shell and double-seamed can end
US4809861A (en) Buckle resistant can end
US4559801A (en) Increased strength for metal beverage closure through reforming
EP0103074A2 (de) Erlangung erhöhter Steifigkeit für Metalldeckel durch Umstülpen gekrümmter Abschnitte
US4796772A (en) Metal closure with circumferentially-variegated strengthening
USRE33217E (en) Buckle resistance for metal container closures
US5749257A (en) Rivet in a converted can end, method of manufacture, and tooling
US4790705A (en) Method of forming a buckle resistant can end
US4862722A (en) Method for forming a shell for a can type container
JPH04311445A (ja) 缶本体
GB2067159A (en) Buckle-resistant container ends

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19840925

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19851231

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NGUYEN, TUAN ANH