EP3096897B1 - Method for producing a beverage can, a bottle-can or an aerosol can from aluminium alloy - Google Patents

Method for producing a beverage can, a bottle-can or an aerosol can from aluminium alloy Download PDF

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Publication number
EP3096897B1
EP3096897B1 EP15705040.2A EP15705040A EP3096897B1 EP 3096897 B1 EP3096897 B1 EP 3096897B1 EP 15705040 A EP15705040 A EP 15705040A EP 3096897 B1 EP3096897 B1 EP 3096897B1
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Prior art keywords
blank
metal
beverage
profile
rolling direction
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EP15705040.2A
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German (de)
French (fr)
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EP3096897A1 (en
Inventor
Hervé STOPPIGLIA
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Constellium Neuf Brisach SAS
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Constellium Neuf Brisach SAS
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Priority to PL15705040T priority Critical patent/PL3096897T3/en
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    • 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
    • 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
    • B21D28/00—Shaping by press-cutting; Perforating
    • B21D28/02—Punching blanks or articles with or without obtaining scrap; Notching
    • B21D28/06—Making more than one part out of the same blank; Scrapless working

Definitions

  • the invention relates to the field of aluminum alloy beverage cans, also known to those skilled in the art under the name of “cans” or “beverage cans”, but also metal bottles or “bottle-cans” and aerosol cans, manufactured by stamping-stretching, that is to say according to a process including in particular these two basic steps.
  • the invention relates more particularly to a stamping process optimized for this type of application and having in particular the advantage of avoiding the so-called “pinched horns” phenomenon, well known to those skilled in the art, with the risk of breakage. that it involves during subsequent stretching.
  • Aluminum alloys are used more and more in the manufacture of beverage cans, also known under the name of “cans” or “beverage cans”, but also of metal bottles or “bottle-cans” and boxes of. aerosol, because of their very good aesthetic appearance, in particular compared to plastics and steels, their ability to be recycled and their good resistance to corrosion. All the aluminum alloys referred to in what follows are designated, unless otherwise specified, according to the designations defined by the “Aluminum Association” in the “Registration Record Series” that it publishes regularly.
  • Beverage cans or cans, also known to those skilled in the art under the name of “cans” or “beverage cans”, are usually manufactured by stamping-drawing from alloy sheets of the type 3104 in the state. metallurgical H19.
  • the sheet undergoes a first operation of cutting into blanks and stamping into cups or "cups”; more precisely, during this step, the sheet coil feeds a press, also called a “cupper”, which cuts discs called blanks and performs a first stamping operation to produce cups also known as “cups”. ".
  • a press also called a “cupper”
  • the cups are then conveyed to a second press or "bodymaker” where they undergo at least a second stamping and several successive drawing operations; these consist in passing the stamped blank through drawing rings in order to lengthen the metal and thin it. In this way, boxes are gradually obtained whose walls are thinner than the bottom. These boxes are then processed in a machine which gives them a rotary motion while a shear cuts them to the desired height.
  • beverage cans are then conveyed to a shrinking and flanging station (or edging) also known as the “necker flanger” where the upper part of the preform undergoes several successive diameter shrinkages and edging intended for the. subsequent fitting of the cover.
  • a shrinking and flanging station also known as the “necker flanger” where the upper part of the preform undergoes several successive diameter shrinkages and edging intended for the. subsequent fitting of the cover.
  • Metal bottles and aerosol cans or aerosol cans, made of aluminum alloy, are traditionally manufactured by impact spinning, from pins resulting from casting on a wheel.
  • Patent applications testify JP 7060386 by Toyo Rikagaku Kenkyusho from 1993 and EP 0740971 de Hoogovens under priority of 1995.
  • These bottles are not, however, a one-piece structure. Indeed, the vertical walls and neck of the bottle are made from the bottom of the preform and a cover is crimped on the top of the preform.
  • This type of solution is also used in series, particularly in the United States. However, it has the drawback of non-optimum formability with respect to stamping, and also, moreover, of shrinking or “necking”.
  • the shape of the developed perimeter known to those skilled in the art under the name of “horn profile”, is not favorable. This is in fact a profile with six lugs, two of which are positioned respectively at 0 and 180 ° from the rolling direction and four at 45 ° on either side of said direction, in accordance with the figure 1 .
  • the design and use in production of non-circular blanks for the manufacture of beverage cans form part of the state of the art.
  • the objective is to compensate for the anisotropy of the metal by varying the diameter of the blank according to its orientation with respect to the rolling direction. This technology is advantageous because it increases the ratio between the quantity of metal actually used in the beverage can and the quantity of metal engaged on the flat metal, or strip.
  • the invention aims to resolve these difficulties by providing a non-circular blank eliminating any risk of pinched horn (s) during the stamping of the cups or "cups".
  • the figure 1 represents the "horn profile", that is to say the shape of the perimeter developed from the top of the "cups" at the end of the first stamping, with, on the ordinate, the ratio of the height of the horn to the average height of the cup and, on the abscissa, the angle ⁇ with respect to the rolling direction.
  • This is in fact a profile with six lugs, two of which are positioned respectively at 0 and 180 ° from the rolling direction and four at 45 ° on either side of said direction.
  • the figure 2 represents the starting strip of metal A as well as its virtual division into regular hexagons B from which the blanks C.
  • the rolling direction is marked D while the strip width is marked E.
  • the figure 3 provides the same indications, with, in addition, the areas of the hexagon left free at F, G, H and I.
  • the figure 4 represents a curve of the flat outer profile of the uniform circular blank with a radius of 69.3 mm (solid line) and non-circular optimized to take account of the anisotropic behavior of the metal according to the prior art (curve in dotted lines).
  • the radius R in mm On the ordinate, the radius R in mm and, on the abscissa, the angle ⁇ formed with the direction of rolling.
  • the figure 5 represents a curve (continuous with the addition of cross patterns) of the flat outer profile of the non-circular blank according to the invention, designed by adding to the previous variant four horns with a relative height equal to 0.35% of the radius of said variant.
  • the constant radius variant is always represented there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 4 .
  • the figure 6 represents a curve (continuous with the addition of cross patterns) of the flat outer profile of the non-circular blank according to the invention, designed by adding to the “optimized” variant of the figure 4 , four horns with a relative height equal to 0.57% of the radius of said variant.
  • the constant radius variant is always represented there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 5 .
  • the figure 7 represents the profile curves of the cups obtained from the 4 variants of blank, with, on the ordinate the height H of the cup at the corresponding point with a step of 0.1 mm and on the abscissa the angle ⁇ formed with the rolling direction: On the curve full, the profile of the cups obtained with a uniform circular blank with a radius equal to 69.3 mm, In dotted curve, the profile of the cups with a non-circular blank of the so-called “optimal” prior art, On a curve with a cross, the profile of the cups with a non-circular blank optimized according to the invention with 4 horns at 0.35%, Curved with circles, the profile of the cups with a non-circular blank optimized according to the invention with 4 horns at 0.57%.
  • the invention consists in a judicious choice of the design of the non-circular blank, optimized in two stages:
  • a first step of compensating for the anisotropy according to the prior art It consists in compensating for the effect of the anisotropy of the metal by varying the diameter of the blank as a function of its orientation with respect to the rolling direction, typically, and schematically, by increasing the radius of the blank in the directions corresponding to hollows on the profile of the cup, due to the anisotropy of behavior of the metal during the first stamping step, and reducing it in the directions corresponding to horns or bumps on said profile.
  • the typical width at mid-height is equal to the length of the segment perpendicular to the radius joining the center of the blank and the top of the horn, and delimited by the intersection of the horn with a corner sector of approximately 30 ° from the center of the blank.
  • An alloy plate of the 3104 type was cast by continuous vertical casting. It was scalped and then homogenized at a temperature of approximately 580 ° C. for approximately 3 hours before undergoing hot rolling and then cold rolling to the final thickness of 0.264 mm is in the metallurgical state H19. "Cups" were made from this sheet with a diameter of the stamping punch of the cups of 88.9 mm from flat profile blanks according to the variants below, all cut by laser:
  • Variant 1 corresponds to a constant blank radius of 69.3 mm as shown in solid lines on the figure 4 or a circular blank without any optimization.
  • Variant 2 corresponds to a so-called “optimal” blank, that is to say “perfectly” compensating for the anisotropy of behavior of the metal, according to a method known to those skilled in the art, such as that mentioned above reported in item “Convolute Cut-Edge Design for an Earless Cup in Cup Drawing” by RE Dick, JW Yoon and F. Barlat, CP778 Volume A, Numishet 2005 . She is represented on this same figure 4 by a dotted line curve.
  • Variant 3 according to the invention :
  • Variant 3 corresponds to a blank according to the invention, designed by adding to the preceding variant 2 four horns at 35 °, 145 °, 215 ° and 325 °, with a relative height equal to 0.35% of the radius of said variant 2 and a width at mid-height corresponding to a sector of 30 °. She is pictured on the figure 5 by a curve in a continuous line supplemented with cross patterns.
  • Variant 1 is still shown there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 4 .
  • Variant 4 according to the invention :
  • Variant 4 corresponds to a blank according to the invention, designed by adding to the preceding variant 2 four horns at 35 °, 145 °, 215 ° and 325 °, with a relative height equal to 0.57% of the radius of said variant 2 and a width at mid-height corresponding to a sector of 30 °. She is pictured on the figure 6 by a curve in a continuous line supplemented with cross patterns. Variant 1 is still shown there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 4 .
  • the so-called “optimal” prior art blank compensates for the anisotropy of the metal because the amplitude of the profile curve goes from approximately 0.9 mm to less than 0.2 mm.
  • the 4 additional horns are clearly visible on the profile curves with crosses and with circles. The difference in height of the additional horns is correctly related to the difference in the initial horn heights.
  • the height of the artificial horns in the case of the profile of horns at 0.57% (curve with circles), largely exceeds the height of the horns linked to the anisotropy (solid curve) and also meets it in the case of horns.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Description

Domaine de l'inventionField of the invention

L'invention concerne le domaine des boîtes-boissons en alliage d'aluminium, encore connues de l'homme du métier sous l'appellation de « cans » ou « beverage cans », mais aussi des bouteilles métalliques ou « bottle-cans » et boîtiers d'aérosol, fabriqués par emboutissage-étirage, c'est à dire selon un procédé incluant notamment ces deux étapes de base.
L'invention concerne plus particulièrement un procédé d'emboutissage optimisé pour ce type d'application et présentant notamment l'avantage d'éviter le phénomène dit de « cornes pincées », bien connu de l'homme de métier, avec le risque de casse qu'il implique lors des étirages ultérieurs.The invention relates to the field of aluminum alloy beverage cans, also known to those skilled in the art under the name of “cans” or “beverage cans”, but also metal bottles or “bottle-cans” and aerosol cans, manufactured by stamping-stretching, that is to say according to a process including in particular these two basic steps.
The invention relates more particularly to a stamping process optimized for this type of application and having in particular the advantage of avoiding the so-called “pinched horns” phenomenon, well known to those skilled in the art, with the risk of breakage. that it involves during subsequent stretching.

Etat de la techniqueState of the art

Les alliages d'aluminium sont de plus en plus utilisés dans la fabrication des boîtes-boissons, encore connues sous l'appellation de « cans » ou « beverage cans », mais aussi des bouteilles métalliques ou « bottle-cans » et boîtiers d'aérosol, en raison de leur très bon aspect esthétique, notamment par rapport aux matières plastiques et aux aciers, de leur aptitude au recyclage et de leur bonne résistance à la corrosion.
Tous les alliages d'aluminium dont il est question dans ce qui suit sont désignés, sauf mention contraire, selon les désignations définies par l' « Aluminum Association » dans les « Registration Record Sériés » qu'elle publie régulièrement.Aluminum alloys are used more and more in the manufacture of beverage cans, also known under the name of “cans” or “beverage cans”, but also of metal bottles or “bottle-cans” and boxes of. aerosol, because of their very good aesthetic appearance, in particular compared to plastics and steels, their ability to be recycled and their good resistance to corrosion.
All the aluminum alloys referred to in what follows are designated, unless otherwise specified, according to the designations defined by the “Aluminum Association” in the “Registration Record Series” that it publishes regularly.

Les boîtes-boissons, ou canettes, encore connues de l'homme de métier sous l'appellation de « cans » ou « beverage cans », sont usuellement fabriquées par emboutissage-étirage à partir de tôles en alliage du type 3104 à l'état métallurgique H19.Beverage cans, or cans, also known to those skilled in the art under the name of “cans” or “beverage cans”, are usually manufactured by stamping-drawing from alloy sheets of the type 3104 in the state. metallurgical H19.

La tôle subit une première opération de découpage en flans et emboutissage en coupelles ou « cups » ; plus précisément, au cours de cette étape, la bobine de tôle alimente une presse, également appelée « cupper », qui découpe des disques appelés flans et effectue une première opération d'emboutissage pour produire des coupelles aussi connues sous l'appellation de « cups ». Il s'agit là de l'étape concernée au premier chef par l'invention.
Les coupelles sont ensuite acheminées vers une deuxième presse ou « bodymaker » où elles subissent au moins un second emboutissage et plusieurs étirages successifs ; ceux-ci consistent à faire passer l'ébauche emboutie par des bagues d'étirage afin d'allonger le métal et l'amincir.
On obtient ainsi progressivement des boîtes dont les parois sont plus minces que le fond. Ces boîtes sont alors traitées dans une machine qui leur imprime un mouvement rotatif pendant qu'une cisaille les coupe à la hauteur voulue.
Celles-ci sont ensuite lavées dans plusieurs bains de nettoyage et rinçage puis séchées.
Après revêtement, les boîtes boissons sont ensuite acheminées vers un poste de rétreint et bordage (ou bordurage) encore connu sous l'appellation de « necker flanger » où la partie supérieure de la préforme subit plusieurs rétrécissements de diamètre successifs et un bordurage destiné à la pose ultérieure du couvercle.The sheet undergoes a first operation of cutting into blanks and stamping into cups or "cups"; more precisely, during this step, the sheet coil feeds a press, also called a “cupper”, which cuts discs called blanks and performs a first stamping operation to produce cups also known as “cups”. ". This is the step primarily concerned by the invention.
The cups are then conveyed to a second press or "bodymaker" where they undergo at least a second stamping and several successive drawing operations; these consist in passing the stamped blank through drawing rings in order to lengthen the metal and thin it.
In this way, boxes are gradually obtained whose walls are thinner than the bottom. These boxes are then processed in a machine which gives them a rotary motion while a shear cuts them to the desired height.
These are then washed in several cleaning and rinsing baths and then dried.
After coating, the beverage cans are then conveyed to a shrinking and flanging station (or edging) also known as the “necker flanger” where the upper part of the preform undergoes several successive diameter shrinkages and edging intended for the. subsequent fitting of the cover.

Les bouteilles métalliques et boîtiers d'aérosol ou bombes-aérosol, en alliage d'aluminium, sont traditionnellement fabriqués par filage par choc, à partir de pions issus de coulée sur roue.
Les premières bouteilles en alliage d'aluminium, ou « bottle-cans », fabriquées par emboutissage-étirage puis rétreint ou « necking », sont apparues au Japon en 1993 et en Europe en 1995.
En témoignent les demandes de brevet JP 7060386 de Toyo Rikagaku Kenkyusho de 1993 et EP 0740971 de Hoogovens sous priorité de 1995.
Ces bouteilles ne sont toutefois pas de structure monobloc. En effet, les parois verticales et goulot de la bouteille sont fabriqués à partir du fond de la préforme et un couvercle est serti sur le haut de la préforme.Metal bottles and aerosol cans or aerosol cans, made of aluminum alloy, are traditionally manufactured by impact spinning, from pins resulting from casting on a wheel.
The first aluminum alloy bottles, or “bottle-cans”, made by drawing-drawing and then shrinking or “necking”, appeared in Japan in 1993 and in Europe in 1995.
Patent applications testify JP 7060386 by Toyo Rikagaku Kenkyusho from 1993 and EP 0740971 de Hoogovens under priority of 1995.
These bottles are not, however, a one-piece structure. Indeed, the vertical walls and neck of the bottle are made from the bottom of the preform and a cover is crimped on the top of the preform.

Ainsi en est il également dans le cas de la demande WO 0115829 , de Daiwa Can en 2000 sous priorité de 1999, qui revendique une bouteille en alliage d'aluminium fabriquée par formage à chaud avec un outillage complexe.
La fabrication de boîtes-boissons, de bouteilles du type « bottle can » ou de boîtiers d'aérosol en alliage d'aluminium par essentiellement emboutissage-étirage et rétreint nécessite en effet un matériau capable notamment de:

  • subir des emboutissages profonds, c'est-à-dire de formation de coupelles à parois verticales et fond horizontal, avec des rapports d'emboutissage, c'est à dire le rapport du diamètre du flan au diamètre du poinçon, jusqu'à 1.9 voire plus, avec des déformations en rétreint élevées, afin d'obtenir une réduction de diamètre importante en deux passes d'emboutissage (emboutissage et emboutissage de reprise) seulement,
  • et surtout, objet de cet invention, fournir des coupelles ou « cups » de bonne qualité, c'est-à-dire ne présentant pas de défauts connus de l'homme de métier sous l'appellation de « cornes pincées » ni de plis, afin d'éviter toute casse lors de l'étirage ultérieur.
This is also the case in the case of demand WO 0115829 , from Daiwa Can in 2000 under priority of 1999, which claims an aluminum alloy cylinder made by hot forming with complex tooling.
The manufacture of beverage cans, bottles of the “bottle can” type or aerosol cans made of aluminum alloy by essentially drawing-stretching and shrinking indeed requires a material capable in particular of:
  • undergo deep drawing, that is to say of forming cups with vertical walls and horizontal bottom, with stamping ratios, that is to say the ratio of the diameter of the blank to the diameter of the punch, up to 1.9 or even more, with high shrinkage deformations, in order to obtain a significant reduction in diameter in just two stamping passes (stamping and reworking),
  • and above all, object of this invention, to provide cups or "cups" of good quality, that is to say not exhibiting defects known to those skilled in the art under the name of "pinched horns" or pleats. , to avoid breakage during subsequent stretching.

Les premières bouteilles en alliage d'aluminium, ou « bottle-cans », de structure monobloc, et fabriquées essentiellement par emboutissage-étirage puis rétreint ou « necking », ont vu le jour au Japon dans les années 2000. En témoigne la demande JP 2003082429 de Kobe Steel sous priorité de 2001.
Il en va de même pour la demande EP 1870481 sous priorité de 2005 du même Kobe Steel.
Ce type de solution est également utilisé en série notamment aux Etats-Unis. Cependant il présente l'inconvénient d'une formabilité non optimale vis-à-vis de l'emboutissage, et aussi d'ailleurs du rétreint ou « necking ».
En particulier, après emboutissage des coupelles ou « cups », à partir de flans circulaires, la forme du périmètre développé, connue de l'homme de métier sous l'appellation de « profil de cornes », n'est pas favorable.
Il s'agit en effet d'un profil à six cornes, dont deux positionnées respectivement à 0 et 180° de la direction de laminage et quatre à 45° de part et d'autre de ladite direction, conformément à la figure 1.The first aluminum alloy bottles, or “bottle-cans”, with a one-piece structure, and manufactured mainly by drawing-drawing and then shrinking or “necking”, saw the light of day in Japan in the 2000s. JP 2003082429 from Kobe Steel under 2001 priority.
The same goes for demand EP 1870481 under priority of 2005 of the same Kobe Steel.
This type of solution is also used in series, particularly in the United States. However, it has the drawback of non-optimum formability with respect to stamping, and also, moreover, of shrinking or “necking”.
In particular, after stamping of the cups or “cups”, from circular blanks, the shape of the developed perimeter, known to those skilled in the art under the name of “horn profile”, is not favorable.
This is in fact a profile with six lugs, two of which are positioned respectively at 0 and 180 ° from the rolling direction and four at 45 ° on either side of said direction, in accordance with the figure 1 .

Il se trouve qu'une telle configuration, du fait des cornes à 0 et 180°, présente un sérieux risque de donner lieu au phénomène dit de « cornes pincées » bien connu de l'homme de métier, avec le risque de casse lors des étirages ultérieurs.
Pour pallier ce problème, la conception et l'utilisation en production de flans non circulaires pour la fabrication de boîtes boisson font partie de l'état de la technique. Dans ce contexte, l'objectif est de compenser l'anisotropie du métal en faisant varier le diamètre du flan en fonction de son orientation par rapport à la direction de laminage. Cette technologie est avantageuse car elle augmente le ratio entre la quantité de métal réellement utilisée dans la boîte boisson et la quantité de métal engagé sur le métal à plat, ou bande.
Une telle conception typique est parfaitement décrite notamment dans l'article « Convolute Cut-Edge Design for an Earless Cup in Cup Drawing » de R. E. Dick, J. W. Yoon et F. Barlat, CP778 Volume A, Numishet 2005 . It turns out that such a configuration, because of the 0 and 180 ° lugs, presents a serious risk of giving rise to the so-called "pinched lugs" phenomenon well known to those skilled in the art, with the risk of breakage during subsequent stretching.
To overcome this problem, the design and use in production of non-circular blanks for the manufacture of beverage cans form part of the state of the art. In this context, the objective is to compensate for the anisotropy of the metal by varying the diameter of the blank according to its orientation with respect to the rolling direction. This technology is advantageous because it increases the ratio between the quantity of metal actually used in the beverage can and the quantity of metal engaged on the flat metal, or strip.
Such a typical design is fully described in particular in the article “Convolute Cut-Edge Design for an Earless Cup in Cup Drawing” by RE Dick, JW Yoon and F. Barlat, CP778 Volume A, Numishet 2005 .

Problème poséProblem

L'utilisation de ce type de flan non circulaire a hélas pour inconvénient majeur de rendre le procédé d'emboutissage bien plus sensible à la moindre variabilité d'anisotropie de métal. En effet, la coupelle ou « cup » emboutie, réalisée à partir d'un flan non circulaire, présente théoriquement un profil « plat » car les creux et bosses ont été compensés par les variations de diamètre du flan de départ. Dans ce cas, toute variation de l'anisotropie du métal va fatalement générer un profil présentant des cornes de taille et orientation non maîtrisées. Ainsi, une modification de l'anisotropie du métal suivant l'axe de laminage ou orthogonalement à cet axe, favorisera l'apparition de 2 cornes diamétralement opposées, ce qui est propice au phénomène de « cornes pincées » que l'homme du métier cherche absolument à éviter.
Ainsi, le profil de la coupelle présente toujours des creux et des cornes au détriment du ratio entre la quantité de métal réellement utilisée dans la boîte boisson et la quantité de métal initiale sur le métal à plat.The use of this type of non-circular blank unfortunately has the major drawback of making the stamping process much more sensitive to the slightest variability of metal anisotropy. In fact, the stamped cup or “cup”, made from a non-circular blank, theoretically has a “flat” profile because the hollows and bumps have been compensated for by the variations in diameter of the starting blank. In this case, any variation in the anisotropy of the metal will inevitably generate a profile having horns of uncontrolled size and orientation. Thus, a modification of the anisotropy of the metal along the rolling axis or orthogonally to this axis, will promote the appearance of 2 diametrically opposed horns, which is conducive to the phenomenon of "pinched horns" that a person skilled in the art seeks. absolutely to be avoided.
Thus, the profile of the cup always has hollows and horns to the detriment of the ratio between the quantity of metal actually used in the beverage can and the initial quantity of metal on the flat metal.

L'invention vise à résoudre ces difficultés en proposant un flan non circulaire éliminant tout risque de corne(s) pincée(s) lors de l'emboutissage des coupelles ou « cups ».The invention aims to resolve these difficulties by providing a non-circular blank eliminating any risk of pinched horn (s) during the stamping of the cups or "cups".

Objet de l'inventionObject of the invention

L'invention a pour objet un procédé de fabrication d'une boîte-boisson, une bouteille ou un boîtier d'aérosol en alliage d'aluminium, par emboutissage-étirage suivi de rétreint et/ou pliage, à partir d'un flan non circulaire, selon lequel :

  • La bande de métal dans laquelle est prélevé chaque flan est virtuellement divisée en hexagones réguliers identiques dont deux côtés opposés sont sensiblement perpendiculaires à la direction de laminage de la dite bande et constituant un système hexagonal compact plan,
  • Le périmètre dudit flan est calculé par ajustement à partir d'un cercle concentrique et de rayon inférieur à celui du cercle inscrit de l'hexagone correspondant, pour compenser, lors de l'emboutissage, l'anisotropie de comportement du métal, selon une méthode connue de l'homme du métier, typiquement telle que décrite dans l'article « Convolute Cut-Edge Design for an Earless Cup in Cup Drawing » de R. E. Dick, J. W. Yoon et F. Barlat , CP778 Volume A, Numishet 2005
    et caractérisé en ce que
  • Au moins quatre cornes sont ajoutées au-delà et à partir dudit périmètre, dans les zones de l'hexagone laissées libres, soit dont l'axe principal forme un angle respectivement de sensiblement 35°, 145°, 215° et 325° avec la direction de laminage, chacune d'une hauteur relative de 0.3 à 0.8% par rapport audit cercle concentrique de départ, et d'une largeur maximum compte-tenu de l'espace disponible, soit typiquement correspondant, à mi-hauteur de ladite corne, à un secteur angulaire minimum de sensiblement 25° ayant pour sommet le centre du flan. L'invention porte également sur un flan d'emboutissage de boîte boisson, bouteille métallique ou boîtier d'aérosol, fabriqué par un procédé tel que décrit ci-dessus.
Elle a également pour objet une boîte-boisson ou bouteille métallique, encore connue de l'homme de métier sous les appellations repectives de « can » ou « beverage can » et « bottle can » ou « bottle type beverage can », fabriquée à partir d'un flan présentant les caractéristiques précitées, y compris une bouteille métallique dite de forme, c'est-à-dire dont les parois principales ne sont pas strictement cylindriques. Elle a également pour objet un boîtier d'aérosol, encore connu de l'homme de métier sous l'appellation de « bombe-aérosol » ou encore « distributeur d'aérosol », fabriqué à partir dudit flan présentant les caractéristiques précitées, y compris un boîtier d'aérosol dit de forme, c'est-à-dire dont les parois principales ne sont pas strictement cylindriques.The subject of the invention is a method of manufacturing a beverage can, a bottle or an aerosol can in aluminum alloy, by drawing-drawing followed by shrinking and / or folding, from a blank not circular, according to which:
  • The metal strip from which each blank is taken is virtually divided into identical regular hexagons, two opposite sides of which are substantially perpendicular to the rolling direction of said strip and constituting a compact hexagonal system,
  • The perimeter of said blank is calculated by adjustment from a concentric circle with a radius smaller than that of the inscribed circle of the corresponding hexagon, to compensate, during stamping, for the anisotropy of behavior of the metal, according to a method known to those skilled in the art, typically as described in the article “Convolute Cut-Edge Design for an Earless Cup in Cup Drawing” by RE Dick, JW Yoon and F. Barlat, CP778 Volume A, Numishet 2005
    and characterized in that
  • At least four horns are added beyond and from said perimeter, in the areas of the hexagon left free, i.e. whose main axis forms an angle of approximately 35 °, 145 °, 215 ° and 325 ° respectively with the rolling direction, each with a relative height of 0.3 to 0.8% with respect to said starting concentric circle, and of a maximum width taking into account the available space, i.e. typically corresponding, at mid-height of said horn, at a minimum angular sector of substantially 25 ° having the center of the blank as its apex. The invention also relates to a beverage can, metal bottle or aerosol can stamping blank manufactured by a process as described above.
It also relates to a beverage can or metal bottle, also known to those skilled in the art under the respective names of “can” or “beverage can” and “bottle can” or “bottle type beverage can”, made from of a blank exhibiting the aforementioned characteristics, including a so-called shaped metal bottle, that is to say the main walls of which are not strictly cylindrical. It also relates to an aerosol case, also known to those skilled in the art under the name of “aerosol can” or “aerosol dispenser”, made from said blank having the aforementioned characteristics, including a so-called shaped aerosol housing, that is to say the main walls of which are not strictly cylindrical.

Description des figuresDescription of the figures

La figure 1 représente le « profil de cornes », c'est-à-dire la forme du périmètre développé du sommet des « coupelles » à l'issue du premier emboutissage, avec, en ordonnée, le rapport de la hauteur de corne à la hauteur moyenne de la coupelle et, en abscisse, l'angle α par rapport à la direction de laminage.
Ce profil, avec des cornes notamment pour α = 0 et 180°, correspond à une coupelle de l'art antérieur sans optimisation. Il s'agit en effet d'un profil à six cornes, dont deux positionnées respectivement à 0 et 180° de la direction de laminage et quatre à 45° de part et d'autre de ladite direction.The figure 1 represents the "horn profile", that is to say the shape of the perimeter developed from the top of the "cups" at the end of the first stamping, with, on the ordinate, the ratio of the height of the horn to the average height of the cup and, on the abscissa, the angle α with respect to the rolling direction.
This profile, with horns in particular for α = 0 and 180 °, corresponds to a cup of the prior art without optimization. This is in fact a profile with six lugs, two of which are positioned respectively at 0 and 180 ° from the rolling direction and four at 45 ° on either side of said direction.

La figure 2 représente la bande de métal de départ A ainsi que son découpage virtuel en hexagones réguliers B dans lesquels sont prélevés les flans C.
La direction de laminage porte le repère D alors que la largeur de bande porte le repère E.The figure 2 represents the starting strip of metal A as well as its virtual division into regular hexagons B from which the blanks C.
The rolling direction is marked D while the strip width is marked E.

La figure 3 fournit les mêmes indications, avec, de plus, les zones de l'hexagone laissées libres en F, G, H et I.The figure 3 provides the same indications, with, in addition, the areas of the hexagon left free at F, G, H and I.

La figure 4 représente une courbe du profil extérieur à plat du flan circulaire uniforme d'un rayon de 69.3 mm (trait plein) et optimisé non circulaire pour tenir compte du comportement anisotropique du métal selon l'art antérieur (courbe en traits pointillés). En ordonnées, le rayon R en mm et, en abscisse, l'angle α formé avec la direction de laminage.The figure 4 represents a curve of the flat outer profile of the uniform circular blank with a radius of 69.3 mm (solid line) and non-circular optimized to take account of the anisotropic behavior of the metal according to the prior art (curve in dotted lines). On the ordinate, the radius R in mm and, on the abscissa, the angle α formed with the direction of rolling.

La figure 5 représente une courbe (continue additionnée de motifs en croix) du profil extérieur à plat du flan non circulaire selon l'invention, conçu en ajoutant à la variante précédente quatre cornes d'une hauteur relative égale à 0.35% du rayon de ladite variante.
La variante à rayon constant y est toujours représentée en un trait plein et le flan de l'art antérieur dit optimal en traits pointillés comme à la figure 4.The figure 5 represents a curve (continuous with the addition of cross patterns) of the flat outer profile of the non-circular blank according to the invention, designed by adding to the previous variant four horns with a relative height equal to 0.35% of the radius of said variant.
The constant radius variant is always represented there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 4 .

La figure 6 représente une courbe (continue additionnée de motifs en croix) du profil extérieur à plat du flan non circulaire selon l'invention, conçu en ajoutant à la variante « optimisée » de la figure 4, quatre cornes d'une hauteur relative égale à 0.57% du rayon de ladite variante.
La variante à rayon constant y est toujours représentée en un trait plein et le flan de l'art antérieur dit optimal en traits pointillés comme à la figure 5.The figure 6 represents a curve (continuous with the addition of cross patterns) of the flat outer profile of the non-circular blank according to the invention, designed by adding to the “optimized” variant of the figure 4 , four horns with a relative height equal to 0.57% of the radius of said variant.
The constant radius variant is always represented there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 5 .

La figure 7 représente les courbes de profil des coupelles obtenues à partir des 4 variantes de flan, avec, en ordonnées la hauteur H de coupelle au point correspondant avec un pas de 0.1 mm et en abscisse l'angle α formé avec la direction de laminage: En courbe pleine, le profil des coupelles obtenues avec un flan circulaire uniforme de rayon égal à 69.3 mm,
En courbe pointillée, le profil des coupelles avec un flan non circulaire de l'art antérieur dit « optimal »,
En courbe avec croix, le profil des coupelles avec un flan non circulaire optimisé selon l'invention avec 4 cornes à 0.35%,
En courbe avec ronds, le profil des coupelles avec un flan non circulaire optimisé selon l'invention avec 4 cornes à 0.57%.The figure 7 represents the profile curves of the cups obtained from the 4 variants of blank, with, on the ordinate the height H of the cup at the corresponding point with a step of 0.1 mm and on the abscissa the angle α formed with the rolling direction: On the curve full, the profile of the cups obtained with a uniform circular blank with a radius equal to 69.3 mm,
In dotted curve, the profile of the cups with a non-circular blank of the so-called “optimal” prior art,
On a curve with a cross, the profile of the cups with a non-circular blank optimized according to the invention with 4 horns at 0.35%,
Curved with circles, the profile of the cups with a non-circular blank optimized according to the invention with 4 horns at 0.57%.

Description de l'inventionDescription of the invention

L'invention consiste dans un choix judicieux de la conception du flan non circulaire, optimisée en deux étapes :
Une première étape de compensation de l'anisotropie selon l'art antérieur : Elle consiste à compenser l'effet de l'anisotropie du métal en faisant varier le diamètre du flan en fonction de son orientation par rapport à la direction de laminage, typiquement, et schématiquement, en augmentant le rayon du flan suivant les directions correspondant à des creux sur le profil de la coupelle, dus à l'anisotropie de comportement du métal lors de la première étape d'emboutissage, et en le réduisant suivant les directions correspondant à des cornes ou bosses sur ledit profil. Une telle conception typique est parfaitement décrite notamment dans l'article « Convolute Cut-Edge Design for an Earless Cup in Cup Drawing » de R. E. Dick, J. W. Yoon et F. Barlat, CP778 Volume A, Numishet 2005 .
Une deuxième étape au cours de laquelle on ajoute au moins quatre cornes au-delà et à partir dudit périmètre, en augmentant le rayon du flan dans les zones au-delà des flans sans cornes additionnelles et à l'intérieur de l'hexagone correspondant, suivant quatre directions symétriques par rapport à la direction de laminage, comme indiqué en figure 3 (zones F, G, H et I).
Plus précisément, si on décompose virtuellement la bande de métal dans laquelle est prélevé chaque flan en hexagones réguliers identiques dont deux côtés opposés sont sensiblement perpendiculaires à la direction de laminage, constituant ainsi un système hexagonal compact plan, comme le montre la figure 2, les quatre cornes sont ajoutées au-delà et à partir dudit périmètre, dans les zones de l'hexagone laissées libres, soit dont l'axe principal forme un angle respectivement de sensiblement 35°, 145°, 215° et 325° avec la direction de laminage, comme le montre la figure 3, chacune d'une hauteur relative de 0.3 à 0.8% par rapport audit cercle concentrique de départ, et d'une largeur maximum compte-tenu de l'espace disponible, soit typiquement correspondant à mi-hauteur de ladite corne à un secteur angulaire minimum de sensiblement 25° ayant pour sommet le centre du flan.
Plus précisément, la largeur typique à mi-hauteur est égale à la longueur du segment perpendiculaire au rayon joignant le centre du flan et le sommet de la corne, et délimité par l'intersection de la corne avec un secteur d'angle de sensiblement 30° issu du centre du flan.The invention consists in a judicious choice of the design of the non-circular blank, optimized in two stages:
A first step of compensating for the anisotropy according to the prior art: It consists in compensating for the effect of the anisotropy of the metal by varying the diameter of the blank as a function of its orientation with respect to the rolling direction, typically, and schematically, by increasing the radius of the blank in the directions corresponding to hollows on the profile of the cup, due to the anisotropy of behavior of the metal during the first stamping step, and reducing it in the directions corresponding to horns or bumps on said profile. Such a typical design is fully described in particular in the article “Convolute Cut-Edge Design for an Earless Cup in Cup Drawing” by RE Dick, JW Yoon and F. Barlat, CP778 Volume A, Numishet 2005 .
A second step during which at least four horns are added beyond and from said perimeter, increasing the radius of the blank in the areas beyond the blanks without additional horns and inside the corresponding hexagon, in four directions symmetrical with respect to the rolling direction, as indicated in figure 3 (zones F, G, H and I).
More precisely, if we virtually decompose the strip of metal from which each blank is taken into identical regular hexagons, two opposite sides of which are substantially perpendicular to the rolling direction, thus constituting a compact hexagonal system, as shown in figure 2 , the four horns are added beyond and from said perimeter, in the areas of the hexagon left free, i.e. the main axis of which forms an angle of approximately 35 °, 145 °, 215 ° and 325 ° respectively with the direction of rolling, as shown in figure 3 , each of a relative height of 0.3 to 0.8% with respect to said starting concentric circle, and of a maximum width taking into account the available space, i.e. typically corresponding to mid-height of said horn to a minimum angular sector of substantially 25 ° having the center of the blank as its apex.
More precisely, the typical width at mid-height is equal to the length of the segment perpendicular to the radius joining the center of the blank and the top of the horn, and delimited by the intersection of the horn with a corner sector of approximately 30 ° from the center of the blank.

La demanderesse a constaté que cette optimisation avait pour effet tout à fait répétitif de limiter au maximum le risque de défauts connus de l'homme de métier sous l'appellation de « cornes pincées » ainsi que de plis, afin d'éviter toute casse lors de l'étirage ultérieur.The Applicant has observed that this optimization had the completely repetitive effect of limiting as much as possible the risk of defects known to those skilled in the art under the name of “pinched horns” as well as of folds, in order to avoid any breakage during the process. subsequent stretching.

Dans ses détails, l'invention sera mieux comprise à l'aide des exemples ci-après, qui n'ont toutefois pas de caractère limitatif.In its details, the invention will be better understood with the aid of the examples below, which are not, however, limiting in nature.

ExemplesExamples

On a coulé par coulée continue verticale une plaque d'alliage du type 3104. Elle a été scalpée puis homogénéisée à une température d'environ 580°C pendant environ 3 heures avant de subir le laminage à chaud puis le laminage à froid jusqu'à l'épaisseur finale de 0.264 mm soit à l'état métallurgique H19.
Des « coupelles » ont été réalisées à partir de cette tôle avec un diamètre du poinçon d'emboutissage des coupelles de 88.9 mm à partir de flans de profil à plat selon les variantes ci-dessous, tous découpés par laser:An alloy plate of the 3104 type was cast by continuous vertical casting. It was scalped and then homogenized at a temperature of approximately 580 ° C. for approximately 3 hours before undergoing hot rolling and then cold rolling to the final thickness of 0.264 mm is in the metallurgical state H19.
"Cups" were made from this sheet with a diameter of the stamping punch of the cups of 88.9 mm from flat profile blanks according to the variants below, all cut by laser:

Variantes 1 et 2 hors invention :Variants 1 and 2 outside the invention:

La variante 1 correspond à un rayon de flan constant de 69.3 mm comme représenté en trait plein à la figure 4 soit un flan circulaire sans aucune optimisation.Variant 1 corresponds to a constant blank radius of 69.3 mm as shown in solid lines on the figure 4 or a circular blank without any optimization.

La variante 2 correspond à un flan dit « optimal », c'est-à-dire compensant « parfaitement » l'anisotropie de comportement du métal, selon une méthode connue de l'homme du métier, telle que celle précitée rapportée dans l'article « Convolute Cut-Edge Design for an Earless Cup in Cup Drawing » de R. E. Dick, J. W. Yoon et F. Barlat, CP778 Volume A, Numishet 2005 .
Elle est représentée sur cette même figure 4 par une courbe en traits pointillés.Variant 2 corresponds to a so-called "optimal" blank, that is to say "perfectly" compensating for the anisotropy of behavior of the metal, according to a method known to those skilled in the art, such as that mentioned above reported in item “Convolute Cut-Edge Design for an Earless Cup in Cup Drawing” by RE Dick, JW Yoon and F. Barlat, CP778 Volume A, Numishet 2005 .
She is represented on this same figure 4 by a dotted line curve.

Variante 3 selon l'invention : Variant 3 according to the invention :

La variante 3 correspond à un flan selon l'invention, conçu en ajoutant à la variante 2 précédente quatre cornes à 35°, 145°, 215° et 325°, d'une hauteur relative égale à 0.35 % du rayon de ladite variante 2 et d'une largeur à mi-hauteur correspondant à un secteur de 30°.
Elle est représentée sur la figure 5 par une courbe en un trait continu additionné de motifs en croix.Variant 3 corresponds to a blank according to the invention, designed by adding to the preceding variant 2 four horns at 35 °, 145 °, 215 ° and 325 °, with a relative height equal to 0.35% of the radius of said variant 2 and a width at mid-height corresponding to a sector of 30 °.
She is pictured on the figure 5 by a curve in a continuous line supplemented with cross patterns.

La variante 1 y est toujours représentée en un trait plein et le flan de l'art antérieur dit optimal en traits pointillés comme à la figure 4.Variant 1 is still shown there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 4 .

Variante 4 selon l'invention : Variant 4 according to the invention :

La variante 4 correspond à un flan selon l'invention, conçu en ajoutant à la variante 2 précédente quatre cornes à 35°, 145°, 215° et 325°, d'une hauteur relative égale à 0.57% du rayon de ladite variante 2 et d'une largeur à mi-hauteur correspondant à un secteur de 30°.
Elle est représentée sur la figure 6 par une courbe en un trait continu additionné de motifs en croix.
La variante 1 y est toujours représentée en un trait plein et le flan de l'art antérieur dit optimal en traits pointillés comme à la figure 4.Variant 4 corresponds to a blank according to the invention, designed by adding to the preceding variant 2 four horns at 35 °, 145 °, 215 ° and 325 °, with a relative height equal to 0.57% of the radius of said variant 2 and a width at mid-height corresponding to a sector of 30 °.
She is pictured on the figure 6 by a curve in a continuous line supplemented with cross patterns.
Variant 1 is still shown there in a solid line and the blank of the prior art said to be optimal in dotted lines as in figure 4 .

Résultats : Results :

A partir de ces quatre variantes de flans, nous avons réalisé des coupelles par emboutissage avec un diamètre du poinçon d'emboutissage de 88.9 mm pour une hauteur moyenne des coupelles de 32 mm.
La figure 7 présente les courbes de profil des coupelles obtenues à partir des 4 variantes de flan :

  • En courbe pleine, le profil des coupelles obtenues avec un flan circulaire uniforme de rayon égal à 69.3 mm.
  • En courbe pointillée, le profil des coupelles avec un flan non circulaire de l'art antérieur dit « optimal ».
  • En courbe avec croix, le profil des coupelles avec un flan non circulaire optimisé selon l'invention avec 4 cornes à 0.35% selon la variante 3.
  • En courbe avec ronds, le profil des coupelles avec un flan non circulaire optimisé selon l'invention avec 4 cornes à 0.57% selon la variante 4.
From these four variants of blanks, we made stamping cups with a stamping punch diameter of 88.9 mm for an average height of the cups of 32 mm.
The figure 7 presents the profile curves of the cups obtained from the 4 variants of blank:
  • In full curve, the profile of the cups obtained with a uniform circular blank of radius equal to 69.3 mm.
  • In dotted curve, the profile of the cups with a non-circular blank of the so-called “optimal” prior art.
  • Curved with a cross, the profile of the cups with a non-circular blank optimized according to the invention with 4 horns at 0.35% according to variant 3.
  • Curved with circles, the profile of the cups with a non-circular blank optimized according to the invention with 4 horns at 0.57% according to variant 4.

On y observe sans ambiguïté que le flan de l'art antérieur dit « optimal » (courbe en pointillés) compense l'anisotropie du métal car l'amplitude de la courbe de profil passe de 0.9 mm environ à moins de 0.2 mm.
Sur la base des profils optimisés selon l'invention, les 4 cornes additionnelles sont bien visibles sur les courbes de profil avec croix et avec ronds. La différence de hauteur des cornes additionnelles est correctement liée à la différence des hauteurs de cornes initiales.
On observe également que la hauteur des cornes artificielles, dans le cas du profil de cornes à 0.57% (courbe avec ronds), dépasse largement la hauteur des cornes liées à l'anisotropie (courbe pleine) et la rejoint aussi dans le cas des cornes à 0.35% (courbe avec croix). Ainsi, le risque de voir apparaître un système à 2 cornes, système plus sensible au phénomène des « cornes pincées », est clairement réduit, y compris par rapport au cas correspondant à la courbe pointillée de l'optimisation selon l'art antérieur, mais aussi, des valeurs négatives (creux du profil supérieur de coupelle) ne sont pas relevées.It can be seen without ambiguity that the so-called “optimal” prior art blank (dotted curve) compensates for the anisotropy of the metal because the amplitude of the profile curve goes from approximately 0.9 mm to less than 0.2 mm.
On the basis of the profiles optimized according to the invention, the 4 additional horns are clearly visible on the profile curves with crosses and with circles. The difference in height of the additional horns is correctly related to the difference in the initial horn heights.
We also observe that the height of the artificial horns, in the case of the profile of horns at 0.57% (curve with circles), largely exceeds the height of the horns linked to the anisotropy (solid curve) and also meets it in the case of horns. at 0.35% (curve with cross). Thus, the risk of seeing a system with 2 horns appear, a system more sensitive to the phenomenon of "pinched horns", is clearly reduced, including compared to the case corresponding to the dotted curve of the optimization according to the prior art, but also, negative values (hollow of the upper cup profile) are not recorded.

Claims (2)

  1. Method for manufacturing a beverage can, a bottle or a spray can made of aluminium alloy, by means of drawing-ironing followed by necking and/or bending, from a non-circular blank, whereby:
    - The metal strip from which each blank is taken is virtually divided into identical regular hexagons wherein two opposite sides are substantially perpendicular to the rolling direction of said strip and forming a plane compact hexagonal system
    - The perimeter of said blank is calculated by adjustment using a concentric circle having a radius less than that of the inscribed circle of the corresponding hexagon, to compensate, during drawing, for the anisotropic behaviour of the metal, by varying the blank diameter according to the orientation thereof with respect to the rolling direction, by increasing the radius of the blank along the directions corresponding to hollows on the cup profile, due to the anisotropic behaviour of the metal during the first drawing step, and reducing same along the directions corresponding to ears or bumps on said profile,
    and characterised in that
    - At least four ears are added beyond and from said perimeter, in the zones of the hexagon left free, either wherein the primary axis forms an angle respectively of substantially 35°, 145°, 215° and 325° with the rolling direction, each having a relative height of 0.3 to 0.8% with respect to said initial concentric circle, and a maximum width in view of the space available, or typically corresponding, at the mid-height of said ear, to a minimum angular sector of substantially 25° having the centre of the blank as the vertex thereof.
  2. Drawing blank of a beverage can, metal bottle or spray can, characterised in that it is manufactured by means of a method according to claim 1, i.e. in that it comprises at least four ears, added beyond and from said perimeter, in the zones of the hexagon left free, either wherein the primary axis forms an angle respectively of substantially 35°, 145°, 215° and 325° with the rolling direction, each having a relative height of 0.3 to 0.8% with respect to said initial concentric circle, and a maximum width in view of the space available, or typically corresponding, at the mid-height of said ear, to a minimum angular sector of substantially 25° having the centre of the blank as the vertex thereof.
EP15705040.2A 2014-01-20 2015-01-15 Method for producing a beverage can, a bottle-can or an aerosol can from aluminium alloy Active EP3096897B1 (en)

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FR1400104A FR3016538B1 (en) 2014-01-20 2014-01-20 PROCESS FOR MANUFACTURING A BOX, METAL BOTTLE OR AEROSOL BOX OF ALUMINUM ALLOY
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RU2016133985A (en) 2018-02-22
CN105916609A (en) 2016-08-31
US10675669B2 (en) 2020-06-09
US20160332208A1 (en) 2016-11-17
PL3096897T3 (en) 2021-02-08
BR112016016067A2 (en) 2017-08-08
RU2016133985A3 (en) 2018-08-01
FR3016538B1 (en) 2016-07-15
WO2015107284A1 (en) 2015-07-23
CN105916609B (en) 2017-12-22
FR3016538A1 (en) 2015-07-24
BR112016016067B1 (en) 2022-11-08
RU2684986C2 (en) 2019-04-16
EP3096897A1 (en) 2016-11-30
ES2818082T3 (en) 2021-04-09

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