EP0636436B1 - Verfahren und Vorrichtung zum Formen des metallischen Deckels eines Behälters und durch dieses Verfahren erzeugter metallischer Deckel - Google Patents

Verfahren und Vorrichtung zum Formen des metallischen Deckels eines Behälters und durch dieses Verfahren erzeugter metallischer Deckel Download PDF

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Publication number
EP0636436B1
EP0636436B1 EP94400938A EP94400938A EP0636436B1 EP 0636436 B1 EP0636436 B1 EP 0636436B1 EP 94400938 A EP94400938 A EP 94400938A EP 94400938 A EP94400938 A EP 94400938A EP 0636436 B1 EP0636436 B1 EP 0636436B1
Authority
EP
European Patent Office
Prior art keywords
cover
die
forming
matrix
peripheral rim
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.)
Expired - Lifetime
Application number
EP94400938A
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English (en)
French (fr)
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EP0636436A1 (de
Inventor
Gérard Heurteboust
Jean-François Seconde
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0636436A1 publication Critical patent/EP0636436A1/de
Application granted granted Critical
Publication of EP0636436B1 publication Critical patent/EP0636436B1/de
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
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures

Definitions

  • the present invention relates to a method and a device for forming from a sheet blank of a cover, also called bottom, comprising a peripheral rim intended to be fixed on the edge of an opening of a container, according to the preambles of claims 1 and 2 respectively.
  • the covers are generally produced by stamping and comprise a peripheral rim intended to be fixed on the edge of an opening of the container and at least one step making it possible to stiffen this cover.
  • the thickness of the cover must be relatively large and the material constituting this cover must have a high elastic limit.
  • the material constituting the lid must have a low elastic limit.
  • the impact resistance of the cover is an important condition which is satisfied thanks to a high thickness and high elastic limit of the material constituting said cover.
  • the reduction in the weight of the cover is an important significant economic aspect which can be resolved either by reducing the thickness of the cover material, or by reducing the flat surface of the sheet blank intended for forming said cover.
  • the thickness of the material varies between 0.10 and 0.26 mm and the elastic limit of this material varies between 490 and 670 Mpa.
  • the sheet blank is cut and the crimping rim is first formed, then at least one stiffening step is formed on this cover.
  • the stamping device comprises a punch for forming the peripheral rim during a first step and a matrix for forming the step during a second step.
  • the cover has a harmful warping for the stacking, the transfer of the covers and the subsequent operations, for example jointing, crimping.
  • EP-A-0 153 115 discloses a process for forming a reinforced pressure-resistant cover consisting of a flat metal blank comprising a central portion and a peripheral portion, to deform the blank during a first step to cause the separation of the central portion and the peripheral portion and to stamp the blank in a U shape, then during a second step to bring the central portion and the rim closer together annular to form a reinforcing rib.
  • EP-A-0 518 613 also discloses a method for manufacturing can lids comprising a crimping rim and a central part, according to the preamble of claim 1 and a device for implementing the method according to the preamble of claim 2.
  • the method consists, during a first step of forming, from a flat metal blank, the crimping rim, then during a second step of bringing the peripheral rim and the central part together to form on said part central stiffening ribs.
  • the object of the invention is to propose a method and a device for forming a metal cover. of a container making it possible to increase, on the one hand, the elastic resistance of the material at the level of the steps and, on the other hand, the pressure of non-return of the cover after the sterilization of the food contained in the container, while decreasing the thickness of the material of this cover and the flat surface of the sheet blank intended for forming said cover.
  • the invention also makes it possible to obtain a cover of steel with high elastic limit not exhibiting buckling.
  • the subject of the invention is therefore a method of forming from a sheet blank of a cover, also called bottom, comprising a peripheral rim intended to be fixed on the edge of an opening of a container and at least a step of stiffening said cover, characterized in that the edge of the sheet blank is maintained over its entire periphery and, successively, said step is formed, then the peripheral rim is formed.
  • the invention also relates to a device for forming from a sheet blank of a cover, also called bottom, comprising a peripheral rim intended to be fixed on the edge of an opening of a container and at least a step for stiffening said cover, said device comprising a blank holder from the edge of the sheet blank over its entire periphery, means for forming the peripheral rim comprising a punch adjacent to the blank holder and means for forming said step comprising, d on the one hand, a first movable matrix and adjacent to the punch and, on the other hand, a second mobile matrix and disposed opposite the first matrix, the faces opposite these matrices having impressions of complementary shape to form said step, said means being distinct and movable independently of each other, characterized in that the first matrix is supported and maintained by at least one compression means in a high position in which its imprint is located above the nose of the punch, said compression means being calibrated for the formation of said step before the formation of said peripheral rim.
  • a metal cover for example a steel designated as a whole by the reference 1 and intended to be fixed for example by crimping or by rolling on the edge of an opening of a container not shown.
  • This cover 1 formed from a sheet blank has for example a circular shape and comprises a peripheral rim 2 and at least one step 3 for stiffening the central part of said cover.
  • the cover 1 comprises a step 3, but this cover 1 can comprise several steps 3.
  • the method of forming the cover 1 from the sheet blank 1a consists in maintaining the edge of the sheet blank 1a over its entire periphery and, successively in forming the step 3, then in forming the peripheral rim 2.
  • the forming device shown in FIG. 2 comprises a blank holder 10 from the edge of the sheet blank 1a over its entire periphery, means 20 for forming the peripheral rim 2 and means 30 for forming the step 3.
  • the means 20 and 30 are distinct and movable independently of each other to form, during a first step, the step 3 and during a second step, the peripheral rim 2.
  • the blank holder 10 is formed by an upper blank holder 11 also called a stamping die and by a lower blank holder 12.
  • the means 20 for forming the peripheral rim 2 are formed by a punch 21 adjacent to the lower blank holder 12 and the nose 21a of which has a shape corresponding to the shape of the peripheral rim 2 of the cover 1.
  • the means 30 for forming the step 3 are formed, on the one hand, by a first matrix 31 movable and adjacent to the punch 21 and, on the other hand, by a second movable die 32 and disposed opposite said first die 31.
  • the face 31a of the first matrix 31 arranged opposite the second matrix 32 has a protruding imprint 33 and the face 32a of the second matrix 32 disposed opposite the first matrix 31 has an imprint 34 arranged opposite the imprint 33 projecting from the first matrix 31.
  • the imprints 33 and 34 are of complementary shape.
  • the punch 21 forms a housing 13 for the first die 31 and in which said first die 31 can slide.
  • At least one compression means for example a spring 14, is interposed between the bottom of the housing 13 and the first die 31.
  • Said compression spring 14 is calibrated to a determined value as will be seen later.
  • the forming device comprises an ejector 15 of the cover after its formation, said ejector 15 being disposed between the upper blank holder 11 and the second die 13 and facing the punch 21.
  • the second die 32 has external peripheral dimensions slightly smaller than the external peripheral dimensions of the first die 31 to allow the metal to flow between the upper blank holder 11, the punch 21 and this upper die 32 during the forming of the peripheral rim 2.
  • the device operates as follows.
  • the sheet blank 1a is cut to determined dimensions and this cut sheet blank 1a is positioned between the lower blank holder 12 and the upper blank holder 11 and between the first die 31 and the second die 32 as represented at Fig. 2.
  • the first die 31 is, under the effect of the compression springs 14, in the high position such that the imprint 33 projecting from said first die 31 is located above the nose 21a of the punch 21.
  • the assembly constituted by the upper blank holder 11, the ejector 15 and the second die 32 gradually descends so that, during a first step, the edge of the sheet blank 1a is maintained over its entire periphery between the upper blank holder 11 and the lower blank holder 12 (Fig. 3) and so that, during a second step, the step 3 is formed by the imprint 33 projecting from the first matrix 31 and by l impression 34 in hollow of the second matrix 32 (FIG. 4).
  • the compression springs 14 are calibrated to a value greater than the force exerted by the second matrix 32 on the first matrix 31 to prevent the descent of this first matrix 31 during the step formation 3.
  • the descent of the first die 31 relative to the fixed punch 21 causes the peripheral rim 2 to form between the nose 21a of the punch 21, the ejector 15 and the dies 31 and 32 as shown in Fig. 5.
  • the assembly constituted by the upper blank holder 11, the ejector 15 and the second die 32 rises as shown in FIG. 6, by driving the cover 1 thus formed and the descent of the ejector 15 causes the cover 1 formed to be ejected as shown in FIG. 7.
  • the forming device according to the invention makes it possible to form the step 3 just after the cutting of the sheet blank.
  • this step is carried out when the periphery of the sheet blank is retained between the upper blank holder and the lower blank holder. Consequently, this pinched surface does not collaborate, or very little, in the deformation of the step 3.
  • the lid obtained by the method according to the invention swells less and the deformation which follows after elastic return of said lid is decreased by 10%.
  • An analysis of the thickness profile of the cover produced by the method according to the invention shows that the top of the step is thinner than with a method according to the state of the art.
  • the metal is more work hardened which explains a better ability of the cover obtained by the method according to the invention, to return to its original shape after its deformation during the sterilization of food contained in the container.
  • the volume of metal required to form the cover by the method according to the invention is therefore less since there is a thinning at the top of the step.
  • the decrease in the volume of metal required being less, the cutting diameter of the sheet blank from which the cover is formed, can therefore be reduced, which makes it possible to lighten the cover.
  • Tests carried out on 73mm diameter covers obtained by the process according to the invention show a gain of 0.5% in material, ie a reduction of 0.3mm in the cutting diameter of the sheet blank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Closing Of Containers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Claims (4)

  1. Verfahren zum Bilden eines Deckels (1) ausgehend von einer Blechplatte (1a), der auch Boden genannt wird, mit einer peripherischen Bordkante (2) zur Befestigung auf dem Rand einer Öffnung eines Behälters und mit zumindest einem Absatz (3) zur Versteifung des Deckels, dadurch gekennzeichnet, daß der Rand der Blechplatte (1a) an seiner gesamten Peripherie gehalten wird und darauffolgend der Absatz (3) gebildet wird und die peripherische Bordkante (2) gebildet wird.
  2. Vorrichtung zum Bilden eines Deckels (1) ausgehend von einer Blechplatte (1a), der auch Boden genannt wird, mit einer peripherischen Bordkante (2) zur Befestigung auf dem einer Öffnung eines Behälters und mit zumindest einem Absatz (3) zur Versteifung des Deckels (1), wobei die Vorrichtung aufweist: einen Blechhalter (10) für den Rand der Blechplatte (1a) entlang ihrer gesamten Peripherie, eine Einrichtung (20) zum Bilden der peripherischen Bordkante (2) mit einem Formeisen (21) neben dem Blechhalter (10) und mit einer Einrichtung (30) zum Bilden des Absatzes (3) einerseits mit einer beweglichen Form (31), welche neben dem Formeisen (21) liegt, und andererseits mit einer zweiten beweglichen Form (32), welche gegenüberliegend der ersten Form (31) angeordnet ist, wobei die gegenüberliegenden Flächen (31a, 32a) dieser Formen (31, 32) Einprägungen (33, 34) komplementärer Gestalt zum Bilden des Absatzes (3) aufweisen, wobei die Einrichtungen (20, 30) verschieden sind und unabhängig voneinander verstellbar sind, dadurch gekennzeichnet, daß die erste Form (31) durch zumindest eine Kompressionseinrichtung (14) in einer Hochposition lagerbar und halterbar ist, in der ihre Einprägung (33) oberhalb des Kopfes (21a) des Formeisens (21) liegt, wobei die Kompressionseinrichtung (14) zur Bildung des Absatzes (3) vor der Bildung der peripherischen Bordkante (2) verstellbar ist.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Formeisen (21) einen Raum (13) für die erste Form (31) neben dem Formeisen (21) bildet, wobei die Kompressionseinrichtung (14) zwischen dem Boden des Raumes (13) und die erste Form (31) eingesetzt ist.
  4. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß sie einen Auswerfer (15) für den gebildeten Deckel (1) aufweist, welcher gegenüber dem Formeisen (21) angeordnet ist.
EP94400938A 1993-06-29 1994-04-29 Verfahren und Vorrichtung zum Formen des metallischen Deckels eines Behälters und durch dieses Verfahren erzeugter metallischer Deckel Expired - Lifetime EP0636436B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9307917A FR2707898B1 (fr) 1993-06-29 1993-06-29 Procédé et dispositif de formage d'un couvercle métallique d'un récipient et couvercle métallique obtenu par ce procédé.
FR9307917 1993-06-29

Publications (2)

Publication Number Publication Date
EP0636436A1 EP0636436A1 (de) 1995-02-01
EP0636436B1 true EP0636436B1 (de) 1997-10-22

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Application Number Title Priority Date Filing Date
EP94400938A Expired - Lifetime EP0636436B1 (de) 1993-06-29 1994-04-29 Verfahren und Vorrichtung zum Formen des metallischen Deckels eines Behälters und durch dieses Verfahren erzeugter metallischer Deckel

Country Status (5)

Country Link
EP (1) EP0636436B1 (de)
AT (1) ATE159437T1 (de)
DE (1) DE69406374T2 (de)
ES (1) ES2110193T3 (de)
FR (1) FR2707898B1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571978A (en) * 1984-02-14 1986-02-25 Metal Box P.L.C. Method of and apparatus for forming a reinforced can end
GB9112783D0 (en) * 1991-06-13 1991-07-31 Cmb Foodcan Plc Can ends

Also Published As

Publication number Publication date
EP0636436A1 (de) 1995-02-01
ES2110193T3 (es) 1998-02-01
FR2707898B1 (fr) 1995-10-20
FR2707898A1 (fr) 1995-01-27
DE69406374T2 (de) 1998-02-26
ATE159437T1 (de) 1997-11-15
DE69406374D1 (de) 1997-11-27

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