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WO1996017700A2 - Repartition des differentes epaisseurs de paroi dans la section d'embouchure de boites-boissons - Google Patents

Repartition des differentes epaisseurs de paroi dans la section d'embouchure de boites-boissons Download PDF

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Publication number
WO1996017700A2
WO1996017700A2 PCT/DE1995/001737 DE9501737W WO9617700A2 WO 1996017700 A2 WO1996017700 A2 WO 1996017700A2 DE 9501737 W DE9501737 W DE 9501737W WO 9617700 A2 WO9617700 A2 WO 9617700A2
Authority
WO
WIPO (PCT)
Prior art keywords
thickness
sheet
ironing
upper edge
wall
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.)
Ceased
Application number
PCT/DE1995/001737
Other languages
German (de)
English (en)
Other versions
WO1996017700A3 (fr
Inventor
Dieter Buse
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 AU41713/96A priority Critical patent/AU4171396A/en
Publication of WO1996017700A2 publication Critical patent/WO1996017700A2/fr
Publication of WO1996017700A3 publication Critical patent/WO1996017700A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
    • 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
    • B21D22/30—Deep-drawing to finish articles formed by deep-drawing

Definitions

  • the technical field of the invention is the forming process for tin cans, be they made of sheet steel or aluminum sheet or a combination material.
  • stretched can bodies are created, which are converted into sealed cans with a lid in a closing process. It is an object of the invention to facilitate the forming processes and at the same time save material and thus costs.
  • a thickness variation is carried out in the upper edge portion of the stretched can body (claim 1).
  • the thickness variation is designed in such a way that at least one additional thickness level d 2 , d 3 or d 4 is provided, in addition to a (single) thickness level from d c to d- j _ already existing in the prior art (cf. ZB EP- A 59 196).
  • the ironing mandrel used for forming has gem.
  • the trimming process is improved if an additional step is provided at the upper edge of the can A, which reduces the sheet to a thickness d 2 , which is approximately in the order of the wall thickness d, ⁇ . the box lies as it is in the main part of the wall - below the drawn-in area B (claim 6).
  • Both the reshaping behavior when shaping the fold and the reshaping behavior when retracting the upper edge of the can are improved with the proposals according to the invention.
  • stripping forces from the ironing mandrel are reduced to a particular extent in order to be able to further reduce the sheet thickness in the rest of the trunk area.
  • the use of lubricants can be avoided due to the improved (easier) forming behavior in order to be able to apply a well-adhering coating after the forming.
  • the coating thus does not take part in the forming process and allows a more corrosion-resistant - because less damaged - surface to be produced.
  • the invention enables such a further development.
  • the prerequisites are created to facilitate the forming processes, in particular the drawing in, trimming and forming of the fold edge, and nevertheless the
  • Figure lb show a drawn in their neck area
  • Tin can 1 which has a wall section C, a
  • Feed section B and a folding section A are fed sections B and a folding section A.
  • the fold section A becomes one in FIG. 1b
  • FIG. 2 shows a sheet thickness distribution, as used along the sections A, B and C according to Figures la, lb in the prior art.
  • the sheet thickness d is that which, after the ironing process in the manufacture of the can body in the upper section B, A of
  • Can wall 1 is present.
  • the sheet tapers to a thickness of d c due to the ironing process, the transition section is symbolically designated 11 and consists of a light weight
  • Figure 3a, Figure 3b, Figure 3c, Figure 3d, Figure 3e show embodiments of
  • FIG. 4b schematically shows the manufacturing process of the ironing with a plunger 100 which pushes a bowl la through a "further pull" 20 in order to change the wall thickness d Q of the blank (of the bowl).
  • FIG. 4b illustrates the change in the diameter of the plunger 100 by means of a "transition point" 100a rounded without a transition, which leads from a first diameter to a second diameter of the plunger 100.
  • the forming process with which the neck region B of the can 1 is drawn in in order to make the diameter of the lid smaller and to be able to save material is not shown. It can be carried out as described in the prior art.
  • the starting point for its implementation, however, is a changed thickness distribution d (x) that follows a certain mathematical function (geometry).
  • the thickness distribution is carried out as is shown in FIGS. 3a to 3e in individual examples, there are advantages in the reshaping of the feed area B, the axial loads on the can can be reduced in the shaping. Oil can be saved because the axial loads are reduced. Due to lack of
  • Lubricant also improves the porosity in the can. Finally, there are lower stripping forces of the ironed cup - after the ironing process according to FIG. 4a - when the ironed cup - the container body - is stripped by the ironing mandrel 100. Can continue
  • Trimmer malfunctions and loss of efficiency can be avoided for the reasons mentioned.
  • d 2 is chosen approximately equal to d c ; d- ⁇ is about half the initial thickness d Q of the cup before stretching.
  • Figures 2 to 3e are not drawn to scale, the thickness d c in the wall section C after the ironing process is approximately one third of the initial thickness d Q.
  • the chosen - not to scale - representation serves to clarify the differences in the mouth section with regard to their thicknesses.
  • FIGS. 3c and 3e Comparable to FIG. 3a in the end section A, which results in the fold 3 - according to FIG. 1b - is the FIGS. 3c and 3e.
  • the examples according to FIGS. 3b and 3d are those which choose a thickness d 1 in the end region A, that is to say they do not differ from the usual sheet thickness d- ⁇ according to FIG. 2 in sections A and B. Instead, a central thickness step 12 is formed in these figures. This central step 12 leads via a further step 11 into the wall section C in FIG. 3b.
  • the central step 12 has an opposite step or bevel 13 in FIG. 3d, which leads into a renewed sheet metal thickening 11a. Only then is the slope 11 transferred into the wall section C.
  • Common to all examples is at least one (additional) slope or thickness step 10, 12 in the upper end section A, B of the fuselage wall, if one excludes the transition step 11, which is normal in the prior art, from the wall thickness d c to the end section thickness d- . Taking them into account, there are at least two thickness levels in the upper end section A, B.
  • the ram 100 according to FIG. 4a has the corresponding negative diameter geometry, so that the thickness steps 10, 11, 12, 13 are obtained during the ironing process.
  • the trimmer line is located between sections A and B, here the wall is cut.
  • the trimmer line is advantageously provided such that it runs to the right of the outermost thickness change step 10 in the figures.
  • FIG. 3a, 3b The examples suggest both a one-step sheet thickness step (FIGS. 3a, 3b), a two-step step (FIGS. 3c, 3d) and a three-step step (FIG. 3e).
  • Two stages - stages characterize changes in thickness in section A or B - form a saddle which has a “low point” which corresponds to a ring plane 13a with thickness d 4 (FIGS. 3d, 3e); the two thickness levels can, however, also lie in relation to one another in such a way that in FIG. 3c a ring hill 10a with the thickness d - j _ is formed, limited by two bevels 10, 12 leading to thinner sheet thicknesses d 2 , d 3 .
  • the ironing mandrel according to FIG. 4b shows one
  • Transition area 100a which is clearly shown in Figure 4a.
  • the actual changes in diameter are so small that they would not be recognizable in the schematic image of FIG. 4a, which is why FIG. 4b illustrates a transition area 100a in a (mirror-image) enlargement of the detail.
  • first segment which is formed by a circular segment in cross-section, a central ramp-shaped area (which, viewed rotationally symmetrically, represents a circumferential surface of a cone) and a third area, which over a (in cross-section) circular segment section turns back into a cylindrical shape of the ironing mandrel 100 passes.
  • the two circle segment transitions at the beginning and at the end of the ramp segment have transitions r1 and r3 (first and third areas) which are shown schematically.
  • the ramp section R running between them corresponds to the ramp section R of FIG. 4a. It runs at a small angle a, which in the example is approximately 2 °. It can be adapted to the thickness geometry to be created according to FIGS.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

L'invention concerne le domaine des procédés de façonnage par déformation pour boîtes-boissons, qu'elles soient en tôle d'acier ou en tôle d'aluminium ou dans un matériau combiné. Dans ce domaine technique, on obtient des fûts (1) de boîtes-boissons étirés, qui sont complétés par un couvercle, lors d'une étape de bouchage, pour donner lieu à des boîtes-boissons fermées. Dans ce domaine technique, l'invention vise à simplifier les processus de déformation, tout en réduisant la quantité de matériaux requis et par conséquent les frais. A cet effet, il est prévu de faire varier l'épaisseur (10, 12, 13) du matériau utilisé dans la section marginale supérieure (A,B) du fût de boîte-boisson étiré. Cette variation d'épaisseur est structurée de manière à permettre une épaisseur supplémentaire d2, d3 ou d4. Le mandrin d'étirage (100) approprié comporte, dans le cas où l'étirage s'effectue sous forme d'opération de déformation, un contour négatif correspondant aux différentes épaisseurs.
PCT/DE1995/001737 1994-12-06 1995-12-06 Repartition des differentes epaisseurs de paroi dans la section d'embouchure de boites-boissons Ceased WO1996017700A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41713/96A AU4171396A (en) 1994-12-06 1995-12-06 Wall thickness distribution in the opening section of cans

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944443434 DE4443434A1 (de) 1994-12-06 1994-12-06 Wanddickenverteilung im Dosenmündungsabschnitt
DEP4443434.0 1994-12-06

Publications (2)

Publication Number Publication Date
WO1996017700A2 true WO1996017700A2 (fr) 1996-06-13
WO1996017700A3 WO1996017700A3 (fr) 1996-08-22

Family

ID=6535075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1995/001737 Ceased WO1996017700A2 (fr) 1994-12-06 1995-12-06 Repartition des differentes epaisseurs de paroi dans la section d'embouchure de boites-boissons

Country Status (3)

Country Link
AU (1) AU4171396A (fr)
DE (1) DE4443434A1 (fr)
WO (1) WO1996017700A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU769793B2 (en) * 2000-06-16 2004-02-05 Corus Staal B.V. Metal can being a pressure tight metal packaging
WO2023021436A1 (fr) * 2021-08-20 2023-02-23 Canpack S.A. Perce-boîtes, canette semi-finie et canette fabriquée à l'aide dudit perce-boîtes

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3951296A (en) * 1971-09-02 1976-04-20 National Steel Corporation Reinforced wall-ironed container
NL8004356A (nl) * 1980-07-30 1982-03-01 Thomassen & Drijver Duntrekinrichting.
GB2083382B (en) * 1980-09-08 1984-06-20 Metal Box Co Ltd Forming can bodies
NL8301069A (nl) * 1983-03-28 1984-10-16 Hoogovens Groep Bv Driedelige metalen verpakkingsbus, halfprodukt voor de vervaardiging van deze bus, en een werkwijze voor de vervaardiging van metalen verpakkingsbussen.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU769793B2 (en) * 2000-06-16 2004-02-05 Corus Staal B.V. Metal can being a pressure tight metal packaging
WO2023021436A1 (fr) * 2021-08-20 2023-02-23 Canpack S.A. Perce-boîtes, canette semi-finie et canette fabriquée à l'aide dudit perce-boîtes

Also Published As

Publication number Publication date
AU4171396A (en) 1996-06-26
DE4443434A1 (de) 1996-06-20
WO1996017700A3 (fr) 1996-08-22

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