EP0127837B1 - Procédé et dispositif pour la fabrication de lignes de déchirage à tôle métallique, en particulier pour la fabrication de couvercles de déchirage pour les boîtes ou récipients - Google Patents

Procédé et dispositif pour la fabrication de lignes de déchirage à tôle métallique, en particulier pour la fabrication de couvercles de déchirage pour les boîtes ou récipients Download PDF

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Publication number
EP0127837B1
EP0127837B1 EP84105832A EP84105832A EP0127837B1 EP 0127837 B1 EP0127837 B1 EP 0127837B1 EP 84105832 A EP84105832 A EP 84105832A EP 84105832 A EP84105832 A EP 84105832A EP 0127837 B1 EP0127837 B1 EP 0127837B1
Authority
EP
European Patent Office
Prior art keywords
stamping
stamping die
tear
score line
arrangement
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
Application number
EP84105832A
Other languages
German (de)
English (en)
Other versions
EP0127837A3 (en
EP0127837A2 (fr
Inventor
Hans-Joachim Pförtner
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.)
Ardagh Metal Packaging Germany GmbH
Original Assignee
Schmalback Lubeca AG
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 Schmalback Lubeca AG filed Critical Schmalback Lubeca AG
Priority to AT84105832T priority Critical patent/ATE31258T1/de
Publication of EP0127837A2 publication Critical patent/EP0127837A2/fr
Publication of EP0127837A3 publication Critical patent/EP0127837A3/de
Application granted granted Critical
Publication of EP0127837B1 publication Critical patent/EP0127837B1/fr
Expired 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
    • 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

Definitions

  • the invention relates to a method for producing tear lines in metal sheets, in particular for producing tear-open lids for cans or similar containers, in which the sheet is placed on an anvil type abutment and by sinking the embossing or scoring edge of a stamping tool corresponding to the course of the tear line a scribe line is generated at a predetermined penetration depth.
  • tear-open covers in which the cover plate can be torn partially or completely along a line of weakness determined by the tear line, preferably with the aid of a part arranged firmly on the tear-open part, such as a handle tab or the like .
  • the course of the weakening line corresponds to the outline of the tearing part.
  • the line of weakness can be closed in itself, so that the tear-open section of the sheet is completely removed from the other sheet metal parts of the can when opened.
  • the tear line can also have an interruption point, e.g. serves to ensure that when opening the container the tear-open part can be torn open to expose the opening, but is permanently connected to the can via the break point of the tear line.
  • the main purpose of this measure is to ensure that the tear-open lid with its sharp tear-open edge, together with the empty container, reaches a waste collection point.
  • the tear-open cover has a more complicated geometric outline shape, the tear line passing through relatively narrow radii of curvature.
  • such a tear line is produced with a uniform embossing tool in a single work step by embossing cracks.
  • the sheet is placed on the anvil part and the embossing tool is lowered so far that the embossing edge provided on the embossing tool and corresponding to the length and the course of the scoring line has penetrated into the sheet to a predetermined depth of sheet thickness.
  • a single scoring tool with only a limited length of the embossing line corresponding to the scoring line can be used and can be brought into effect in two or more successive steps in mutually offset positions. Again in such a way that the individual scribe line sections overlap in the sheet when this appears to be indicated.
  • the invention provides an arrangement with an anvil-like abutment and an embossing tool which has an embossing or scoring edge, this arrangement being further developed in accordance with the invention according to the teaching of claim 2.
  • a single embossing tool can be provided with an embossing or scoring edge of limited length, which can be brought into effect on the sheet in predetermined, differing positions and in a predetermined sequence, such that the two or more scoring lines become sharp at their connection points bump or cross at an angle.
  • the embossing or scoring edge of each part of the embossing tool can have an approximately circular arc shape, the embossing or scoring edges of the parts of the embossing tool having a different radius of curvature.
  • the scribing tool is shown in a form which basically corresponds to the scribing tool of DE-A-2 406 306 mentioned at the beginning corresponds.
  • the scoring tool is made in several parts. 1 and 2 only a part of the scribing or embossing tool is shown. This part is designated by 2.
  • the associated embossed edge is designated 5 (see FIG. 2).
  • a part of the anvil 3 is shown in cross section and detail, on which the sheet 1 is placed before the embossing tool 2 is lowered. The lowering takes place in relation to the anvil 3 to a predetermined approximation, which at the same time determines the depth of penetration of the embossed edge 5 into the sheet 1.
  • the embossed edge has two inclined flanks 6 which have two flats 7 and 8 located at different heights, which are connected to one another via an inclined shoulder.
  • the embossing tool has an embossing edge 5 of only a limited length. This itself is not enough to delimit a tear-in or tear-out part. Rather, several stamping tool parts, each with a limited stamping edge according to FIG. 2, are required. The essential thing is that these embossing tool parts are provided in a predetermined relative geometric arrangement to one another and act on the sheet metal one after the other. As a result, not only can a relatively acute-angled mutual course between adjacent sections of the scoring line be produced, but above all it can be achieved that these scoring line sections intersect slightly at their connection points, as shown by various exemplary embodiments according to FIGS. 3-7.
  • the size of the crossover is exaggerated, since it is usually sufficient for the scoring line sections to cross so far that a direct connection of the scoring lines to one another is reliably ensured.
  • the score lines can also butt against one another at the apex of the angle enclosed by them, as is shown at 19 in FIG. 5.
  • a composite scribe line 14 is provided in addition to a simple scribe line in a sheet.
  • This consists of the scribe line sections 15 and 16, both of which have an approximately circular arc shape, the arches, however, showing different radii of curvature.
  • the length and arrangement is such that the two scribe line sections 15 and 16 intersect slightly at the adjoining points as at 17.
  • a single embossing tool can also be provided which has an embossing edge for producing one of the scoring lines 11 to 13.
  • This embossing tool is arranged in such a way that it can be brought into different positions one after the other and can thus be used one after the other to generate the different scoring lines 11 to 13.
  • a tear-open part 18 is shown by two identical scoring lines in the form of a circular-purpose corner with butt joints 19.
  • FIG. 7 Another geometric shape of a tear-open area with four curved side edges 26 to 29 is shown at 25 in FIG. 7.
  • the adjacent scoring line sections intersect at a sharp angle, the scoring lines preferably crossing at these points, as shown.
  • the new process is equally suitable for sheet metal of any kind, i.e. for aluminum sheet or steel sheet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Removal Of Water From Condensation And Defrosting (AREA)
  • Making Paper Articles (AREA)

Claims (7)

1. Procédé pour la production de lignes d'ouverture dans des tôles métalliques (1 ), particulièrement pour la production de couvercles à ouverture facile pour des boîtes ou des récipients semblables, pour lesquels la tôle (1) est mise sur un support en forme d'enclume et une ligne d'incision est produite par impression des bords de frappe ou d'incision (5) d'un outillage de frappe (2), dont la forme correspond à celle de la ligne d'ouverture, jusqu'à une profondeur d'empreinte prédéterminée, caractérisé en ce que le support (3) et l'outillage de frappe (2) sont formés tous les deux par des segments individuels et composés de façon à ce que les sections de la ligne d'incision allant l'une vers l'autre sous un angle aigu soient frappées successivement et que, pour cela, un segment individuel respectif du support (3) et de l'outillage de frappe (2) soient utilisés en commun, une première section de la ligne d'incision étant produite en premier lieu et une autre section de la ligne d'incision étant produite après dans une telle position par rapport à la première section de la ligne d'incision que les deux sections de la ligne d'incision se coupent à l'origine de l'angle formé entre elles.
2. Disposition pour la réalisation du procédé conforme à la revendication 1 avec un support en forme d'enclume (3) et un outillage de frappe (2) ayant un bord de frappe ou d'incision (5), caractérisée en ce que le support (3) et l'outillage de frappe (2) sont composés tous les deux de segments individuels et que les segments de l'outillage de frappe (2) sont disposés en une position relative géométrique prédéterminée et agissent successivement sur la tôle (1 ) de sorte qu'une disposition partielle composée d'un segment individuel de l'outillage de frappe (2) et d'un segment individuel du support (3) est prévue pour chaque opération de frappe individuelle dans une opération de frappe à plusieurs stades successifs et que les dispositions partielles peuvent être opérées de manière que des sections d'une ligne d'incision se forment à un angle aigu et se coupent aux points d'origine des angles formés par elles.
3. Disposition conforme à la revendication 2, caractérisée en ce que le bord de frappe ou d'incision (5) de chaque partie de l'outillage de frappe (2) est courbé approximativement en arc de cercle.
4. Disposition conforme à la revendication 2, caractérisée en ce que les bords du frappe ou d'incision (5) des parties de l'outillage de frappe (2) ont des rayons de courbure différents.
5. Disposition conforme à une revendications 2 à 4, caractérisée en ce qu'un outillage de frappe avec un seul bord de frappe ou d'incision d'une longueur limitée peut être fait agir sur la tôle en des positions variantes prédéterminées et dans un ordre prédéterminé.
6. Disposition conforme à une des revendications 2 à 5, caractérisée en ce que le bord de frappe ou d'incision (5) de l'outillage de frappe (2) a des sections de profondeurs d'empreinte différentes sur sa longueur ou sur ses différents segments individuels.
7. Disposition conforme à une des revendications 2 à 6, caractérisée en ce que le bord de frappe ou d'incision (5) au moins de l'outillage de frappe (2) a une discontinuité (30) au minimum d'une longueur prédéterminée.
EP84105832A 1983-06-01 1984-05-22 Procédé et dispositif pour la fabrication de lignes de déchirage à tôle métallique, en particulier pour la fabrication de couvercles de déchirage pour les boîtes ou récipients Expired EP0127837B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84105832T ATE31258T1 (de) 1983-06-01 1984-05-22 Verfahren und anordnung zum herstellen von aufreisslinien in metallblechen, insbesondere zur herstellung von aufreissdeckeln fuer dosen oder dgl. behaelter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833319949 DE3319949A1 (de) 1983-06-01 1983-06-01 Verfahren und anordnung zum herstellen von aufreisslinien in metallblechen, insb. zur herstellung von aufreissdeckeln fuer dosen oder dgl. behaelter
DE3319949 1983-06-01

Publications (3)

Publication Number Publication Date
EP0127837A2 EP0127837A2 (fr) 1984-12-12
EP0127837A3 EP0127837A3 (en) 1985-05-29
EP0127837B1 true EP0127837B1 (fr) 1987-12-09

Family

ID=6200482

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84105832A Expired EP0127837B1 (fr) 1983-06-01 1984-05-22 Procédé et dispositif pour la fabrication de lignes de déchirage à tôle métallique, en particulier pour la fabrication de couvercles de déchirage pour les boîtes ou récipients

Country Status (6)

Country Link
EP (1) EP0127837B1 (fr)
AT (1) ATE31258T1 (fr)
DE (2) DE3319949A1 (fr)
DK (1) DK270484A (fr)
ES (1) ES291996Y (fr)
NO (1) NO159705C (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1041421A (en) * 1964-03-03 1966-09-07 Metal Box Co Ltd Improvements in or relating to the scoring of thin sheet metal
US3227304A (en) * 1964-09-08 1966-01-04 Charles T Ashury Can opening arrangement
US3355058A (en) * 1965-12-06 1967-11-28 Charles T Asbury Push-in can lid
US3688718A (en) * 1969-10-23 1972-09-05 Aluminum Co Of America Method and apparatus for scoring metal container ends
US3898944A (en) * 1973-06-18 1975-08-12 Continental Can Co Score and tool for forming the score

Also Published As

Publication number Publication date
ES291996Y (es) 1988-05-16
NO159705C (no) 1989-02-01
DE3319949A1 (de) 1984-12-06
EP0127837A3 (en) 1985-05-29
ES291996U (es) 1987-11-01
NO159705B (no) 1988-10-24
NO842161L (no) 1984-12-03
DE3467982D1 (en) 1988-01-21
EP0127837A2 (fr) 1984-12-12
DK270484A (da) 1984-12-02
ATE31258T1 (de) 1987-12-15
DK270484D0 (da) 1984-05-30

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