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WO2025151494A1 - Construction de coque à bulle inverse et procédé de formation de rivet et outillage associé - Google Patents

Construction de coque à bulle inverse et procédé de formation de rivet et outillage associé

Info

Publication number
WO2025151494A1
WO2025151494A1 PCT/US2025/010703 US2025010703W WO2025151494A1 WO 2025151494 A1 WO2025151494 A1 WO 2025151494A1 US 2025010703 W US2025010703 W US 2025010703W WO 2025151494 A1 WO2025151494 A1 WO 2025151494A1
Authority
WO
WIPO (PCT)
Prior art keywords
shell
tooling assembly
bubble
rivet
forming
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.)
Pending
Application number
PCT/US2025/010703
Other languages
English (en)
Inventor
Steven Todd ALBRIGHT
Dennis Cornelius STAMMEN
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.)
Stolle Machinery Co LLC
Original Assignee
Stolle Machinery Co LLC
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 Stolle Machinery Co LLC filed Critical Stolle Machinery Co LLC
Publication of WO2025151494A1 publication Critical patent/WO2025151494A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/28—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness
    • B65D17/401—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall
    • B65D17/4012—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions at lines or points of weakness characterised by having the line of weakness provided in an end wall for opening partially by means of a tearing tab
    • 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
    • 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
    • B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles

Definitions

  • the can body typically has a base and a sidewall extending from the base to define a generally enclosed space that is open at one end.
  • the can body is filled with product and the can end is then coupled (e.g., seamed) to the can body at the open end.
  • the container is, in some instances, heated to cook and/or sterilize the contents thereof. This process increases the internal pressure of the container.
  • the container contains, in some instances, a pressurized product such as, but not limited to a carbonated beverage. It will therefore be appreciated that the container must have a minimum strength. [0004]
  • the strength of the container is related to the thickness of the metal from which the can body and the can end is formed as well as the shape and configuration of various elements of the can body and can end.
  • the present application primarily addresses the can ends rather than the can bodies.
  • the can ends are commonly referred to as “easy open” ends and include a tear panel and an opening device (e.g., a pull tab).
  • the tear panel is defined by a score profile, or score line, on the exterior surface (identified herein as the “public side”) of the can end.
  • the pull tab is attached (e.g., without limitation, riveted) adjacent the tear panel and is structured to be lifted and/or pulled to sever the score line and deflect and/or remove the severable panel, thereby creating an opening for dispensing the contents of the container.
  • a shell/can end is formed in a press having a plurality of stations.
  • the blank is moved intermittently, or as used herein “indexed,” through the plurality of stations, meaning the blank is moved and stops at each station wherein a forming operation is performed (it is understood that some stations are “null” stations that do not perform a forming operation).
  • the first bubble coining surface 122 is structured to move between a first position (not shown), wherein the first bubble coining surface 122 is spaced from the second bubble coining surface 132, and the second position shown in Figure 1A, wherein the first bubble coining surface 122 and the second bubble coining surface 132 engage the shell 4 to form the expandable bubble 2. That is, the tooling coins (i.e., compresses) segments 6, 8 of the shell 4 and creates the upward projection 10 thereby forming the aforementioned expandable bubble 2.
  • expandable bubble 2 has been shown to result in enhanced rivet formation processes and properties, continued room for improvement remains and the quest to reduce metal thickness while maintaining strength and rivet forming consistency continues.
  • a rivet forming method comprises providing a sheet material with a base thickness.
  • the sheet material is formed into a shell.
  • a reverse bubble is formed on the shell.
  • the shell is formed into a can end.
  • the reverse bubble is formed into a rivet button.
  • the rivet button is staked into a rivet to secure a pull tab to the can end.
  • a reverse bubble shell construct comprises a shell. A convex sidewall extends upward from the shell.
  • the upper tooling assemblies 250 for the stations move at the same time and are driven by a single drive assembly (not shown).
  • elements of a tooling assembly are also identified as parts of a specific station 202. That is, for example, the upper tooling assembly 350 at the bubble station 302, discussed below, is also identified as the bubble station upper tooling assembly 350.
  • any specifically identified upper tooling assembly 250 or lower tooling assembly 252, e.g., without limitation, a “rivet station upper tooling assembly 750,” are generally part of the upper/lower tooling assemblies 250/252, respectively, and the identifier/name merely indicates the nature of the station.
  • the lower tooling assembly 252 is, in an exemplary embodiment, coupled, directly coupled, or fixed to the frame 254. [0047] It is understood that, generally, the belt 206 moves when the upper tooling assembly 250 is in (or moving toward or away from) the first position. Conversely, the belt 206 is stationary when the upper tooling assembly 250 is in the second position. As is known, the drive assembly is structured to move the upper tooling assembly 250 between the first and second positions. Further, and as is known, the upper tooling assembly 250 and the lower tooling assembly 252 include separately movable elements (e.g., without limitation, punches, dies, spacers, pads, risers and other sub-elements (collectively hereinafter “sub- elements”)), that are structured to move separately from each other.
  • sub- elements e.g., without limitation, punches, dies, spacers, pads, risers and other sub-elements
  • the drive assembly includes cams, linkages, and other elements that are structured to move the sub-elements of the upper tooling assembly 250 and the lower tooling assembly 252 in the proper order. That is, selected sub- elements of the upper tooling assembly 250 and the lower tooling assembly 252 are structured to move independently of other selected sub-elements. For example, one selected sub-element is structured to move into, and dwell, at the second position while another sub- element moves into and out of the second position.
  • the upper tooling assembly 350 of the bubble station 302 includes an upper punch 308 and an upper cap 306.
  • the upper punch 308 has a generally cylindrical body 320 and defines a first bubble coining surface 322.
  • the generally cylindrical body 320 defines an opening 326.
  • the opening 326 is elongated and extends upward through the first bubble coining surface 322 and at least partially into the upper punch 308.
  • the opening 326 may extend entirely through the upper punch 308.
  • the opening 326 is centrally defined on the first bubble coining surface 322.
  • the recess 334 is dimensioned to form the central portion 17 of the reverse bubble 13, wherein the recess 334 forms an area of no contact between the shell 5 and the lower tooling assembly 352, such that a reverse bubble 13 can be at least partially formed therein.
  • the recess 334 of the lower punch 312 is of a greater area than the opening 326 of the upper punch 308. As such, the recess 334 defines the diameter 25 of the annular apex 16 of the reversed bubble 13.
  • the body 330 of the exemplary lower punch 312 instead includes the recess 334 and, therefore, is not structured to, and does not, engage the central portion 17 of the shell 5, as shown in Figure 3A.
  • the central portion 17 of the shell 5 is not engaged at all by any tooling. This leaves the material thicker in the central portion 17.
  • the central portion 17 is formed downward in the direction of arrow 15 and into the recess 334 of the lower punch 312, as shown in Figure 3A.
  • This is precisely the opposite of the prior art tooling and forming method shown and described with respect to Figure 1A, and thus creates the unique concave downwardly extending central portion 17 resulting in the “reverse bubble” 13 of the disclosed concept.
  • the reverse bubble 13 includes a convex sidewall 14 with a concave central portion 17 defined centrally therein.
  • the concave central portion 17 is defined within an annular apex 16 defined at a highest point of the convex sidewall 14 relative to the shell 5, wherein the convex sidewall 14 transitions into the concave central portion 17.
  • the concave central portion 17 extends between two opposing points 19, 21 of the annular apex 16 defined between the convex sidewall 14 and the concave central portion 17.
  • the annular apex 16 has a diameter 25, shown in the exemplary embodiment of Figure 3B as the distance 25, between the first opposing point 19 and the second opposing point 21 of the annular apex 16.
  • the reverse bubble 13 is of a uniform shape and thickness around an entire perimeter thereof.
  • the depth 27 of the concave central portion 17 is also shown in Figure 3B. [0053] As further discussed herein, the reverse bubble 13 results in a number of enhanced rivet properties.
  • the method includes providing 1001 a shell having a central panel, an annular countersink, a chuck wall, and a curl.
  • finishing operations include, but are not limited to, scoring, paneling, inspection, and/or applying coatings and/or other surface treatments.
  • forming 1004 a rivet button on the shell includes forming 1010 a bubble construct on the shell, forming 1020 the bubble with a concave central portion 17 to create a reverse bubble 13, and/or forming 1022 the reverse bubble 13 into a rivet button 23 having a sidewall 24, a generally planar top portion 26, and a peripheral upper edge 28.
  • the sidewall 24 of the rivet button 13 is of a greater thickness than the peripheral upper edge 28 and the sidewall 24.
  • the diameter of the rivet 33 can be relatively larger, as previously described, with a lower risk of the rivet 33 tearing when the can end 70 is opened.
  • staking 1005 the rivet button 23 includes providing 1030 a tab 50 with a body having an opening, positioning 1032 the tab 50 over the rivet button with the rivet button extending through the tab opening, forming 1034 the rivet button into the rivet, wherein the rivet has the aforementioned enhanced properties and advantages.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Insertion Pins And Rivets (AREA)

Abstract

L'invention concerne un procédé de formation de rivet comprenant la fourniture d'un matériau en feuille ayant une épaisseur de base, la formation du matériau en feuille dans une coque, la formation d'une bulle inverse sur la coque, la formation de la coque dans une extrémité de boîte, la formation de la bulle inverse dans un bouton de rivet, l'agrafage du bouton de rivet pour fixer une languette de traction à l'extrémité de boîte, et la réalisation d'opérations de finition sur l'extrémité de boîte. La bulle inverse fournit des procédés et des propriétés de formation de rivet améliorés et permet l'utilisation d'une feuille métallique ayant une épaisseur de base plus mince.
PCT/US2025/010703 2024-01-12 2025-01-08 Construction de coque à bulle inverse et procédé de formation de rivet et outillage associé Pending WO2025151494A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202463620364P 2024-01-12 2024-01-12
US63/620,364 2024-01-12

Publications (1)

Publication Number Publication Date
WO2025151494A1 true WO2025151494A1 (fr) 2025-07-17

Family

ID=96349113

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2025/010703 Pending WO2025151494A1 (fr) 2024-01-12 2025-01-08 Construction de coque à bulle inverse et procédé de formation de rivet et outillage associé

Country Status (2)

Country Link
US (1) US20250229942A1 (fr)
WO (1) WO2025151494A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191564A (en) * 1963-05-15 1965-06-29 Ermal C Fraze Method of fabricating a sheet metal joint
US3361102A (en) * 1964-11-06 1968-01-02 American Can Co Method of making an end closure
US3602980A (en) * 1968-12-23 1971-09-07 Aluminum Co Of America Method for forming a sheet metal joint
US3750606A (en) * 1970-03-18 1973-08-07 Aluminum Co Of America Rivet fabrication
US20230286033A1 (en) * 2018-01-23 2023-09-14 Stolle Machinery Company, Llc Shell with expandable rivet button and tooling therefor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191564A (en) * 1963-05-15 1965-06-29 Ermal C Fraze Method of fabricating a sheet metal joint
US3361102A (en) * 1964-11-06 1968-01-02 American Can Co Method of making an end closure
US3602980A (en) * 1968-12-23 1971-09-07 Aluminum Co Of America Method for forming a sheet metal joint
US3750606A (en) * 1970-03-18 1973-08-07 Aluminum Co Of America Rivet fabrication
US20230286033A1 (en) * 2018-01-23 2023-09-14 Stolle Machinery Company, Llc Shell with expandable rivet button and tooling therefor

Also Published As

Publication number Publication date
US20250229942A1 (en) 2025-07-17

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