EP0451013B1 - Method and apparatus for making an embossed part in a sheet metal plate and product obtained by this method - Google Patents

Method and apparatus for making an embossed part in a sheet metal plate and product obtained by this method Download PDF

Info

Publication number
EP0451013B1
EP0451013B1 EP91400795A EP91400795A EP0451013B1 EP 0451013 B1 EP0451013 B1 EP 0451013B1 EP 91400795 A EP91400795 A EP 91400795A EP 91400795 A EP91400795 A EP 91400795A EP 0451013 B1 EP0451013 B1 EP 0451013B1
Authority
EP
European Patent Office
Prior art keywords
punch
zone
preforming
embossed part
sheet metal
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
EP91400795A
Other languages
German (de)
French (fr)
Other versions
EP0451013A1 (en
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 EP0451013A1 publication Critical patent/EP0451013A1/en
Application granted granted Critical
Publication of EP0451013B1 publication Critical patent/EP0451013B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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 subject of the present invention is a method and a device for forming a raised part on a sheet blank, for example a rivet of a so-called easy opening lid for metal boxes or various containers.
  • the present invention also relates to a product comprising a raised part obtained by the method according to the invention.
  • the processes for forming a raised part on a sheet blank, used up to now, consist in carrying out a succession of stamping operations using several sets of die and punch in order to gradually form blanks. until the final obtaining of said raised part.
  • a flat sheet metal blank 1 is placed in a first set of matrix 2 and punch 3 so as to achieve, by bringing together said matrix 2 and said punch 3, an expansion of said sheet blank on a zone located in forming a first bubble-shaped blank 1a (Fig. 1a).
  • this first blank 1a is placed in a second set of matrix 4 and punch 5 (Fig. 1b) to produce a first neck forming a second blank 1b
  • this second blank 1b thus formed is placed in a third set of matrix 6 and punch 7 (Fig. 1c) to make a second neck forming a third blank 1c
  • this third blank 1c is finally placed in a fourth die set 8 and punch 9 (Fig. 1d) in order to obtain the raised part final 1d, said punch 9 having dimensions substantially equivalent to said part in relief.
  • This thinning is due to a concentration of the deformations in a limited area of the sheet blank during the successive forming phases.
  • thin irons which are generally very hardened, are characterized by their stiffness and their low ability to deform so that expanding forming proves to be very difficult to carry out, since the metal at the periphery of the part relief does not participate in the deformations, and there is generally a rupture of the metal at the top of said raised part.
  • the object of the present invention is in particular to remedy these drawbacks by proposing a method and a drawing device according to claims 1 and 6.
  • the surface of the localized preformed zone is substantially equivalent to that of said localized zone after final forming.
  • the present invention also relates to the application of the method to the production of a rivet of a so-called easy opening cover.
  • the device for forming, according to the invention, a part in relief on a sheet blank 10, such as a rivet of a cover said to be easy opening, consists of a die set and preforming punch respectively 20 and 25 (Fig. 2) and a die set and shaping punch respectively 30 and 35 (Fig. 3).
  • the die 20 and the punch 25 for preforming have imprints of complementary shape to produce, as will be seen later, on a localized area of the sheet blank (10) a succession of undulations.
  • the imprints of the preforming matrix 20 are constituted by a series of projections 21a, 21b and 21c and of recesses 22a, 22b and 22c for example three in number and whose height increases from the center towards the periphery of said matrix 20 .
  • the imprints of the preforming punch 25 consist of a series of projections 26a, 26b and 26c and of recesses 27a, 27b and 27c, the height of which decreases from the center towards the periphery of said punch 25.
  • the projection 26a of the punch 25 and the hollow 22a of the preforming die 20 have a shape substantially equivalent to the shape of the raised part which it is desired to obtain on the sheet blank 10.
  • the projecting part 26a of the punch 25 and the hollow 22a of the die 20 have a cylindrical shape and the projections 21a, 21b, 21c and 26a, 26b, 26c respectively of the die 20 and the punch 25 are constituted by radial rings.
  • the shaping matrix 30 has an imprint 31 and the shaping punch 35 has a projection 36 of shape complementary to said imprint 31 and also identical to the shape of the raised part which it is desired to obtain on the blank 10.
  • the forming method according to the invention consists of two successive operations, a preforming operation using the die 20 and the punch 25 and a shaping operation using the die 30 and the punch 35.
  • the flat sheet blank 10 is placed between the die 20 and the preform punch 25, said sheet blank being held, for example, by peripheral blank clamps not shown.
  • the die 20 descends and at the start of the stamping, the projection 21c comes into contact with the blank 10 which is itself in contact with the projection 26a of the punch 25 (FIG. 4a).
  • This first phase makes it possible to determine on the blank 10 a localized zone A (FIG. 6) on which the stresses will be uniformly distributed, while the peripheral zone of the blank surrounding the localized zone A, kept pressed by the blank holder, is not stretched and does not undergo deformations.
  • the matrix 20 continues to descend so that the projections 21b, 26b and 21a, 26c come into contact with the blank 10 (Fig. 4b), then gradually interpenetrate (Fig. 4c) until the moment when the the highest projection, that is to say the projection 21c, comes to bear in the hollow 27c of the punch 25.
  • This preforming operation therefore causes the material to deform in several places and allows the surface to be deformed to be divided into several annular sections.
  • the material thins at the level of the support of the projection (s) and, during the formation of the step corrugations, the initial deformations are kept blocked under the contact effect of said projections.
  • the surface of the preformed localized zone A is substantially equivalent to said localized zone after final shaping of the raised part.
  • the punch 35 of conformation comprises means for controlling the constriction of the blank 10 during the unfolding of the corrugations 10d and the conformation of the raised part 10a.
  • control means are formed by rings 37 arranged either at the level of the reliefs or at the level of the hollows of the corrugations 10d, and pressurized for example by springs 38.
  • the method and the device according to the invention therefore make it possible to form a raised part on a sheet metal blank in two operations.
  • the invention applies to all types of material and allows the use of strongly hardened thin irons with a thickness of between 0.10 and 0.20 mm, in particular for lids with easy opening of metal boxes or various containers.
  • the covers have a smaller thickness which leads to a gain in weight, a lower cost and a lower opening effort of these covers.
  • the invention applies not only to the forming of raised parts of circular section, such as rivets for covers, but also to the forming of raised parts of any section and possibly variable depending on the height of said raised part. .

Landscapes

  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Making Paper Articles (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Physical Vapour Deposition (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Container Filling Or Packaging Operations (AREA)
  • Packaging For Recording Disks (AREA)

Abstract

The subject of the invention is a method for forming an embossed part on a metal sheet blank (10) with the aid of a die and a punch. A preforming operation and a shaping operation are carried out on at least one localised zone of the metal sheet blank (10), of greater dimensions than those of the said embossed part, thereby forming the said embossed part. During the preforming operation, a succession of tiered undulations are progressively produced on an intermediate zone of the said localised zone, located between the eventual high part of the said embossed part at the periphery of the said localised zone and, during the shaping operation, the tiered undulations of the said intermediate zone are progressively opened out and, simultaneously, the said embossed part is formed. <??>The subject of the invention is also an apparatus for implementing the method. <IMAGE>

Description

La présente invention a pour objet un procédé et un dispositif de formage d'une partie en relief sur un flan de tôle, par exemple d'un rivet d'un couvercle dit à ouverture facile pour boîtes métalliques ou récipients divers.The subject of the present invention is a method and a device for forming a raised part on a sheet blank, for example a rivet of a so-called easy opening lid for metal boxes or various containers.

La présente invention a également pour objet un produit comportant une partie en relief obtenue par le procédé selon l'invention.The present invention also relates to a product comprising a raised part obtained by the method according to the invention.

Les procédés de formage d'une partie en relief sur un flan de tôle, utilisés jusqu'à présent, consistent à réaliser une succession d'opérations d'emboutissage à l'aide de plusieurs jeux de matrice et poinçon afin de former progressivement des ébauches jusqu'à l'obtention finale de ladite partie en relief.The processes for forming a raised part on a sheet blank, used up to now, consist in carrying out a succession of stamping operations using several sets of die and punch in order to gradually form blanks. until the final obtaining of said raised part.

Sur la figure 1 ci-jointe, on a représenté schématiquement les différentes étapes d'un procédé de formage classique.In Figure 1 attached, there is shown schematically the different stages of a conventional forming process.

Tout d'abord, on place un flan de tôle 1 plan dans un premier jeu de matrice 2 et poinçon 3 de façon à réaliser, par rapprochement de ladite matrice 2 et dudit poinçon 3, une expansion dudit flan de tôle sur une zone localisée en formant une première ébauche 1a en forme de bulle (Fig. 1a).First of all, a flat sheet metal blank 1 is placed in a first set of matrix 2 and punch 3 so as to achieve, by bringing together said matrix 2 and said punch 3, an expansion of said sheet blank on a zone located in forming a first bubble-shaped blank 1a (Fig. 1a).

Ensuite, cette première ébauche 1a est placée dans un second jeu de matrice 4 et poinçon 5 (Fig. 1b) pour réaliser un premier rétreint formant une deuxième ébauche 1b, puis cette deuxième ébauche 1b ainsi formée est placée dans un troisième jeu de matrice 6 et poinçon 7 (Fig. 1c) pour réaliser un second rétreint formant une troisième ébauche 1c, et cette troisième ébauche 1c est enfin placée dans un quatrième jeu de matrice 8 et poinçon 9 (Fig. 1d) afin d'obtenir la partie en relief finale 1d, ledit poinçon 9 possédant des dimensions sensiblement équivalentes à ladite partie en relief.Then, this first blank 1a is placed in a second set of matrix 4 and punch 5 (Fig. 1b) to produce a first neck forming a second blank 1b, then this second blank 1b thus formed is placed in a third set of matrix 6 and punch 7 (Fig. 1c) to make a second neck forming a third blank 1c, and this third blank 1c is finally placed in a fourth die set 8 and punch 9 (Fig. 1d) in order to obtain the raised part final 1d, said punch 9 having dimensions substantially equivalent to said part in relief.

On voit donc que ce procédé connu nécessite quatre phases successives ce qui multiplie les opérations de manipulation et de transfert des flans de tôle entre chaque phase et augmente ainsi le prix de revient du produit fini.It can therefore be seen that this known process requires four successive phases, which increases the handling and transfer operations of the sheet blanks between each phase and thus increases the cost price of the finished product.

De plus, avec ce procédé connu, il se crée, au cours des différentes phases de formage, un amincissement localisé du métal, plus particulièrement au sommet de la partie en relief, qui peut se traduire, après formage, par une rupture du métal notamment dans le cas d'un martelage de ladite partie en relief pour le rivetage d'un anneau d'arrachement d'un couvercle à ouverture facile.In addition, with this known process, a localized thinning of the metal is created, during the different forming phases, more particularly at the top of the raised part, which can result, after forming, in particular in breaking the metal. in the case of a hammering of said raised part for the riveting of a tear-off ring of an easy-opening cover.

Cet amincissement est dû à une concentration des déformations sur une zone limitée du flan de tôle au cours des phases successives de formage.This thinning is due to a concentration of the deformations in a limited area of the sheet blank during the successive forming phases.

Compte-tenu de cet inconvénient, le procédé utilisé jusqu'à présent ne permet pas l'emploi de matériaux de faibles épaisseurs et plus particulièrement de fers minces et fortement écrouis.Given this drawback, the process used until now does not allow the use of materials of small thicknesses and more particularly of thin irons and strongly hardened.

En effet, les fers minces, qui sont généralement très écrouis, se caractérisent par leur raideur et leur faible aptitude à se déformer si bien que le formage en expansion s'avère très difficile à réaliser, car le métal à la périphérie de la partie en relief ne participe pas aux déformations, et il se crée généralement une rupture du métal au sommet de ladite partie en relief.Indeed, thin irons, which are generally very hardened, are characterized by their stiffness and their low ability to deform so that expanding forming proves to be very difficult to carry out, since the metal at the periphery of the part relief does not participate in the deformations, and there is generally a rupture of the metal at the top of said raised part.

Or, on sait que l'emploi de fers minces et fortement écrouis, par exemple dans le cas des couvercles à ouverture facile, offre de nombreux avantages qui sont notamment une épaisseur plus faible des couvercles et donc un gain de poids, une diminution des efforts d'ouverture et une amélioration de la faisabilité des lignes de moindre résistance sur le couvercle.However, it is known that the use of thin irons and strongly hardened, for example in the case of covers with easy opening, offers many advantages which are in particular a thinner thickness of the covers and therefore a gain in weight, a reduction in opening forces and improvement in the feasibility of lines of least resistance on the cover.

Il a déjà été proposé, dans le document FR 2 164 703, de résoudre ce problème en réalisant, dans la zone entourant le rivet, une moulure annulaire en forme d'ondulation de manière à étirer le métal dans cette zone, pour rendre du métal disponible pour la formation ultérieure du rivet. Toutefois ce procédé ne peut s'appliquer à des fers très minces et fortement écrouis car l'ondulation formée de part et d'autre du plan du flan ne suffit pas pour créer la surface supplémentaire nécessaire au formage du rivet, et si on accentue l'amplitude de l'ondulation pour tendre à l'obtention de cette surface, on risque une rupture du flan par étirage excessif localisé vers les sommets de l'ondulation. De plus, l'ondulation ainsi formée de part et d'autre du plan du flan ne peut être correctement remise en forme lors de l'opération de formage définitif du rivet sans risque d'étirage supplémentaire du fer déjà écroui à la limite de la rupture.It has already been proposed, in document FR 2 164 703, to solve this problem by producing, in the zone surrounding the rivet, an annular molding in the form of a corrugation so as to stretch the metal in this zone, to make metal available for subsequent rivet formation. However, this method cannot be applied to very thin and strongly hardened irons because the undulation formed on either side of the plane of the blank is not sufficient to create the additional surface necessary for forming the rivet, and if the amplitude of the ripple to tend to obtain this surface, there is a risk of rupture of the blank by excessive stretching located towards the peaks of the ripple. In addition, the corrugation thus formed on either side of the plane of the blank cannot be properly reshaped during the operation of definitive forming of the rivet without risk of additional drawing of the iron already hardened to the limit of the rupture.

La présente invention a notamment pour but de remédier à ces inconvénients en proposant un procédé et un dispositif d'emboutissage selon les revendications 1 et 6.The object of the present invention is in particular to remedy these drawbacks by proposing a method and a drawing device according to claims 1 and 6.

Selon une autre caractéristique du procédé, la surface de la zone localisée préformée est sensiblement équivalente à celle de ladite zone localisée après formage définitif.According to another characteristic of the method, the surface of the localized preformed zone is substantially equivalent to that of said localized zone after final forming.

Selon d'autres caractéristiques du dispositif :

  • le poinçon de conformation comporte des moyens de contrôle du rétreint du flan de tôle lors du dépliage des ondulations en gradins et de la conformation de la partie en relief,
  • les moyens de contrôle du rétreint sont formés par des bagues mobiles mises sous pression, par exemple par des ressorts.
According to other characteristics of the device:
  • the shaping punch comprises means for controlling the constriction of the sheet blank during the unfolding of the stepped corrugations and the shaping of the raised part,
  • the constriction control means are formed by pressurized movable rings, for example by springs.

La présente invention a encore pour objet l'application du procédé à la réalisation d'un rivet d'un couvercle dit à ouverture facile.The present invention also relates to the application of the method to the production of a rivet of a so-called easy opening cover.

Selon d'autres caractéristiques :

  • le rivet est formé à partir d'un flan de tôle en fer mince fortement écroui,
  • le flan de tôle a une épaisseur comprise entre 0,10 et 0,20mm.
According to other characteristics:
  • the rivet is formed from a blank of thin iron plate which is strongly hardened,
  • the sheet blank has a thickness of between 0.10 and 0.20mm.

D'autres caractéristiques et avantages de l'invention apparaitront à la lecture de la description qui va suivre donnée à titre d'exemple et faite en référence aux dessins annexés sur lesquels :

  • la Fig. 1 représente les différentes phases de formage d'une partie en relief avec un dispositif selon l'art antérieur,
  • la Fig. 2 représente schématiquement en coupe le jeu de matrice et poinçon de préformage du dispositif selon l'invention,
  • la Fig. 3 représente schématiquement en coupe le jeu de matrice et poinçon de conformation du dispositif selon l'invention,
  • les Figs. 4a à 4d sont des demi-vues schématiques en coupe montrant les phases successives de préformage avec le dispositif selon l'invention,
  • les Figs. 5a à 5d sont des demi-vues schématiques en coupe montrant les phases successives de conformation avec le dispositif selon l'invention,
  • la Fig. 6 est un diagramme montrant la répartition des contraintes sur le flan de tôle, d'une part avec le procédé selon l'art antérieur, et d'autre part, avec le procédé selon l'invention,
  • la Fig. 7 représente schématiquement en coupe une variante du jeu de matrice et poinçon de conformation du dispositif selon l'invention.
Other characteristics and advantages of the invention will appear on reading the description which follows, given by way of example and made with reference to the appended drawings in which:
  • Fig. 1 represents the different phases of forming a part in relief with a device according to the prior art,
  • Fig. 2 schematically shows in section the set of die and preforming punch of the device according to the invention,
  • Fig. 3 diagrammatically shows in section the set of dies and punch for shaping the device according to the invention,
  • Figs. 4a to 4d are schematic half-views in section showing the successive phases of preforming with the device according to the invention,
  • Figs. 5a to 5d are schematic half-views in section showing the successive phases of conformation with the device according to the invention,
  • Fig. 6 is a diagram showing the distribution of the stresses on the sheet blank, on the one hand with the method according to the prior art, and on the other hand, with the method according to the invention,
  • Fig. 7 schematically shows in section a variant of the die set and shaping punch of the device according to the invention.

En se reportant tout d'abord aux Figs 2 et 3, on voit que le dispositif de formage, selon l'invention, d'une partie en relief sur un flan de tôle 10, tel qu'un rivet d'un couvercle dit à ouverture facile, se compose d'un jeu de matrice et poinçon de préformage respectivement 20 et 25 (Fig. 2) et d'un jeu de matrice et poinçon de conformation respectivement 30 et 35 (Fig. 3).Referring first to Figs 2 and 3, it can be seen that the device for forming, according to the invention, a part in relief on a sheet blank 10, such as a rivet of a cover said to be easy opening, consists of a die set and preforming punch respectively 20 and 25 (Fig. 2) and a die set and shaping punch respectively 30 and 35 (Fig. 3).

La matrice 20 et le poinçon 25 de préformage comportent des empreintes de forme complémentaire pour réaliser, comme on le verra ultérieurement, sur une zone localisée du flan de tôle (10) une succession d'ondulations.The die 20 and the punch 25 for preforming have imprints of complementary shape to produce, as will be seen later, on a localized area of the sheet blank (10) a succession of undulations.

Ainsi, les empreintes de la matrice 20 de préformage sont constituées par une série de saillies 21a, 21b et 21c et de creux 22a, 22b et 22c par exemple au nombre de trois et dont la hauteur croît du centre vers la périphérie de ladite matrice 20.Thus, the imprints of the preforming matrix 20 are constituted by a series of projections 21a, 21b and 21c and of recesses 22a, 22b and 22c for example three in number and whose height increases from the center towards the periphery of said matrix 20 .

Les empreintes du poinçon 25 de préformage sont constituées par une série de saillies 26a, 26b et 26c et de creux 27a, 27b et 27c dont la hauteur décroît du centre vers la périphérie dudit poinçon 25.The imprints of the preforming punch 25 consist of a series of projections 26a, 26b and 26c and of recesses 27a, 27b and 27c, the height of which decreases from the center towards the periphery of said punch 25.

La saillie 26a du poinçon 25 et le creux 22a de la matrice 20 de préformage ont une forme sensiblement équivalente à la forme de la partie en relief que l'on désire obtenir sur le flan de tôle 10.The projection 26a of the punch 25 and the hollow 22a of the preforming die 20 have a shape substantially equivalent to the shape of the raised part which it is desired to obtain on the sheet blank 10.

Par exemple et dans le cas du formage d'un rivet sur le flan de tôle 10, la partie en saillie 26a du poinçon 25 et le creux 22a de la matrice 20 ont une forme cylindrique et les saillies 21a, 21b, 21c et 26a, 26b, 26c respectivement de la matrice 20 et du poinçon 25 sont constituées par des anneaux radiaux.For example and in the case of forming a rivet on the sheet blank 10, the projecting part 26a of the punch 25 and the hollow 22a of the die 20 have a cylindrical shape and the projections 21a, 21b, 21c and 26a, 26b, 26c respectively of the die 20 and the punch 25 are constituted by radial rings.

La matrice 30 de conformation comporte une empreinte 31 et le poinçon 35 de conformation comporte une saillie 36 de forme complémentaire à ladite empreinte 31 et également identique à la forme de la partie en relief que l'on désire obtenir sur le flan 10.The shaping matrix 30 has an imprint 31 and the shaping punch 35 has a projection 36 of shape complementary to said imprint 31 and also identical to the shape of the raised part which it is desired to obtain on the blank 10.

Le procédé de formage, selon l'invention, consiste en deux opérations successives, une opération de préformage à l'aide de la matrice 20 et du poinçon 25 et une opération de conformation à l'aide de la matrice 30 et du poinçon 35.The forming method according to the invention consists of two successive operations, a preforming operation using the die 20 and the punch 25 and a shaping operation using the die 30 and the punch 35.

En se reportant aux Figs 4 et 5 on va maintenant décrire ces deux opérations.Referring to Figs 4 and 5 we will now describe these two operations.

Tout d'abord, on place le flan de tôle 10 plan entre la matrice 20 et le poinçon 25 de préformage, ledit flan de tôle étant maintenu, par exemple, par des serre-flans périphériques non représentés.First of all, the flat sheet blank 10 is placed between the die 20 and the preform punch 25, said sheet blank being held, for example, by peripheral blank clamps not shown.

La matrice 20 descend et au début de l'emboutisssage, la saillie 21c entre en contact avec le flan 10 qui est lui même en contact avec la saillie 26a du poinçon 25 (Fig.4a).The die 20 descends and at the start of the stamping, the projection 21c comes into contact with the blank 10 which is itself in contact with the projection 26a of the punch 25 (FIG. 4a).

Cette première phase permet de déterminer sur le flan 10 une zone localisée A (Fig. 6) sur laquelle les contraintes seront uniformément ré-parties, alors que la zone périphérique du flan entourant la zone localisée A, maintenue pressée par le serre-flan, n'est pas étirée et ne subit pas de déformations.This first phase makes it possible to determine on the blank 10 a localized zone A (FIG. 6) on which the stresses will be uniformly distributed, while the peripheral zone of the blank surrounding the localized zone A, kept pressed by the blank holder, is not stretched and does not undergo deformations.

Ensuite, la matrice 20 continue à descendre de telle sorte que les saillies 21b, 26b et 21a, 26c entrent en contact avec le flan 10 (Fig. 4b), puis s'interpénètrent progressivement (Fig. 4c) jusqu'au moment où la saillie la plus haute, c'est à dire la saillie 21c, vienne en appui dans le creux 27c du poinçon 25.Then, the matrix 20 continues to descend so that the projections 21b, 26b and 21a, 26c come into contact with the blank 10 (Fig. 4b), then gradually interpenetrate (Fig. 4c) until the moment when the the highest projection, that is to say the projection 21c, comes to bear in the hollow 27c of the punch 25.

Ainsi, on forme sur une zone intermédiaire B de la zone localisée A du flan 10 et située entre la future partie haute 10b de la partie en relief 10a à former et la périphérie de la zone localisée A, une succession d'ondulations 10d réparties en gradins (Fig. 6).Thus, there is formed on an intermediate zone B of the localized zone A of the blank 10 and situated between the future upper part 10b of the raised part 10a to be formed and the periphery of the localized zone A, a succession of undulations 10d distributed in bleachers (Fig. 6).

Cette opération de préformage conduit donc le matériau à se déformer en plusieurs endroits et permet de partager la surface à déformer en plusieurs tranches annulaires.This preforming operation therefore causes the material to deform in several places and allows the surface to be deformed to be divided into several annular sections.

Au début de l'emboutissage, le matériau s'amincit au niveau de l'appui de la ou des saillies et, lors du formage des ondulations en gradins, les déformations initiales sont maintenues bloquées sous l'effet de contact desdites saillies.At the start of stamping, the material thins at the level of the support of the projection (s) and, during the formation of the step corrugations, the initial deformations are kept blocked under the contact effect of said projections.

En fin d'opération, les déformations se développent le long des rayons, puis dans les parties laissées libre entre les saillies.At the end of the operation, the deformations develop along the spokes, then in the parts left free between the projections.

De plus, la surface de la zone localisée A préformée est sensiblement équivalente à ladite zone localisée après formage définitif de la partie en relief.In addition, the surface of the preformed localized zone A is substantially equivalent to said localized zone after final shaping of the raised part.

Grâce à cette disposition, et comme on peut le voir sur la Fig. 6, les contraintes sont uniformément réparties sur la zone A du flan 10.Thanks to this arrangement, and as can be seen in FIG. 6, the stresses are uniformly distributed over the area A of the blank 10.

Lors de la deuxième opération représentée sur les Figs. 5a à 5b, on pratique, après positionnement de la préforme du flan 10 entre la matrice 30 et le poinçon 35 de conformation (Fig. 5a), un rétreint selon la forme donnée par la saillie 36 dudit poinçon 35.During the second operation shown in Figs. 5a to 5b, after the preform of the blank 10 is positioned between the die 30 and the punch 35 of conformation (FIG. 5a), a shrinking according to the shape given by the projection 36 of said punch 35 is practiced.

A cet effet, on descend progressivement la matrice 30 de façon à réaliser un dépliage successif des ondulations 10d (Fig. 5b et 5c), jusqu'au formage définitif de la partie en relief 10a (Fig. 5d), le métal de ladite zone intermédiaire, à l'exclusion de celui utilisé pour constituer la surface latérale de la partie en relief, se trouvant alors ramené sensiblement dans le plan du flan.To this end, we gradually descend the matrix 30 so as to successively unfold the corrugations 10d (Fig. 5b and 5c), until the final formation of the raised part 10a (Fig. 5d), the metal of said intermediate zone, excluding that used to constitute the lateral surface of the raised part, being then brought back substantially in the plane of the blank.

Grâce au dépliage successif des ondulations 10d, il se crée une retenue suffisante pour faciliter le passage de la matière dans l'empreinte 31 de la matrice 30.Thanks to the successive unfolding of the corrugations 10d, sufficient retention is created to facilitate the passage of the material in the cavity 31 of the matrix 30.

Selon une variante représentée à Fig. 7, le poinçon 35 de conformation comporte des moyens de contrôle du rétreint du flan 10 lors du dépliage des ondulations 10d et de la conformation de la partie en relief 10a.According to a variant shown in FIG. 7, the punch 35 of conformation comprises means for controlling the constriction of the blank 10 during the unfolding of the corrugations 10d and the conformation of the raised part 10a.

Ces moyens de contrôle sont formés par des bagues 37 disposées, soit au niveau des reliefs ou soit au niveau des creux des ondulations 10d, et mises sous pression par exemple par des ressorts 38.These control means are formed by rings 37 arranged either at the level of the reliefs or at the level of the hollows of the corrugations 10d, and pressurized for example by springs 38.

Le procédé et le dispositif selon l'invention permettent donc de former sur un flan de tôle une partie en relief en deux opérations.The method and the device according to the invention therefore make it possible to form a raised part on a sheet metal blank in two operations.

L'invention s'applique à tous typés de matériau et permet l'emploi de fers minces fortement écrouis d'une épaisseur comprise entre 0,10 et 0,20 mm, notamment pour des couvercles à ouverture facile de boîtes métalliques ou récipients divers.The invention applies to all types of material and allows the use of strongly hardened thin irons with a thickness of between 0.10 and 0.20 mm, in particular for lids with easy opening of metal boxes or various containers.

Grâce à l'emploi de ce type de matériau, les couvercles ont une plus faible épaisseur ce qui entraine un gain de poids, un coût inférieur et- un moindre effort d'ouverture de ces couvercles.Thanks to the use of this type of material, the covers have a smaller thickness which leads to a gain in weight, a lower cost and a lower opening effort of these covers.

Par ailleurs, il permet également une amélioration de la faisabilité des lignes de moindre résistance prévues sur ces couvercles et une diminution de la profondeur de ces lignes.In addition, it also allows a improvement of the feasibility of the lines of least resistance provided on these covers and a reduction in the depth of these lines.

L'invention s'applique non seulement au formage de parties en relief de section circulaire, telles que des rivets pour couvercles, mais aussi, au formage de parties en relief de section quelconque et éventuellement variable en fonction de la hauteur de ladite partie en relief.The invention applies not only to the forming of raised parts of circular section, such as rivets for covers, but also to the forming of raised parts of any section and possibly variable depending on the height of said raised part. .

Claims (8)

  1. Method for making an embossed part (10a) in a sheet metal blank (10) with the aid of a die and a punch, in which method a preforming operation is carried out in at least one localized zone (A) of the sheet metal blank (10), this zone (A) being larger in size than the said embossed part (10a), which preforming operation consists in producing an undulation in an intermediate zone B in the said zone A, this intermediate zone B being located between the future upper part (10b) of the said embossed part (10a) and the circumference of the said zone A, and a conformation operation is then carried out in order to form the said embossed part (10a), in the course of which the undulation in the said intermediate zone (B) is unfolded and the said embossed part (10a) is formed, characterised in that, in the course of the preforming operation, there is produced a series of stepped undulations (10d) located on the same side of the sheet metal blank (10) and, in the course of the conformation operation, the said stepped undulations (10d) are successively unfolded from the centre towards the circumference.
  2. Embossing method according to claim 1, characterised in that the surface area of the preformed localized zone is substantially equivalent to the surface area of the said localized zone after final forming.
  3. Method according to one of claims 1 and 2, characterised in that it is applied to the production of a rivet for so-called easy-opening lids.
  4. Method according to claim 3, characterised in that the rivet is formed from a sheet of iron (10) which is cold-worked very thin.
  5. Method according to claim 4, characterised in that the sheet metal blank (10) has a thickness of between 0.10 and 0.20 mm.
  6. Device for making an embossed part (10a) in a sheet metal blank (10), comprising a preforming die (20) and punch (25) set and a conformation die (30) and punch (35) set, the preforming die (20) and punch (25) each being provided with shaping marks having complementary shapes in order to form an undulation in the localized zone (A) of the said sheet metal blank (10), which localized zone (A) is larger in size than the said embossed part (10a) to be formed, characterised in that the shaping marks of the preforming die (20) and punch (25) set are formed by a series of concentric projections (21a, 21b,... and 26a, 26b...) and cavities (22a, 22b... and 27a, 27b...), the said projections (21a, 21b...) and the said cavities (22a, 22b...) of the preforming die having a height which increases from the centre towards the circumference of the said die, and the said preforming projections (26a, 26b...) and the said cavities (27a, 27b...) of the preforming punch (25) having a height which decreases from the centre towards the circumference of the said punch.
  7. Embossing device according to claim 6, characterised in that the conformation punch (35) comprises means for checking the contraction in area of the sheet metal blank (10) during unfolding of the stepped undulations (10d) and the conformation of the embossed part (10a).
  8. Embossing device according to claim 7, characterised in that the means for checking the contraction in area are formed by movable rings (37) placed under pressure, for example, by springs (38).
EP91400795A 1990-04-03 1991-03-25 Method and apparatus for making an embossed part in a sheet metal plate and product obtained by this method Expired - Lifetime EP0451013B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004264A FR2660220B1 (en) 1990-04-03 1990-04-03 PROCESS AND DEVICE FOR FORMING A RELIEF PART ON A SHEET OF SHEET AND PRODUCT OBTAINED ACCORDING TO THIS PROCESS.
FR9004264 1990-04-03

Publications (2)

Publication Number Publication Date
EP0451013A1 EP0451013A1 (en) 1991-10-09
EP0451013B1 true EP0451013B1 (en) 1994-05-18

Family

ID=9395407

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400795A Expired - Lifetime EP0451013B1 (en) 1990-04-03 1991-03-25 Method and apparatus for making an embossed part in a sheet metal plate and product obtained by this method

Country Status (13)

Country Link
US (1) US5174146A (en)
EP (1) EP0451013B1 (en)
JP (1) JPH05305360A (en)
KR (1) KR100231074B1 (en)
AT (1) ATE105749T1 (en)
CA (1) CA2038958C (en)
DE (1) DE69102004T2 (en)
DK (1) DK0451013T3 (en)
ES (1) ES2056595T3 (en)
FI (1) FI112331B (en)
FR (1) FR2660220B1 (en)
NO (1) NO176239C (en)
PT (1) PT97213B (en)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH681614A5 (en) * 1991-07-03 1993-04-30 Soremartec Sa
FR2734182B1 (en) * 1995-05-19 1997-07-25 Metal Box Plc METHOD FOR MANUFACTURING A RIVET BODY IN A METAL PLATE
US6026573A (en) * 1997-05-14 2000-02-22 Dana Corporation Method for manufacturing a side rail for a vehicle frame assembly
BR9811360A (en) * 1998-06-24 2000-08-22 Weirton Steel Corp Process and tool for forming single hemispherical rivet, equipment for carrying out the process, single hemispheric rivet and rigid sheet metal end closure structure
US6669891B1 (en) 1999-04-02 2003-12-30 Midwest Brake Bond Company Method and apparatus for producing brake lining material
US6245180B1 (en) 1999-04-02 2001-06-12 Midwest Brake Bond Company Methods for bending brake lining material and for forming a lined brake shoe
JP2002092717A (en) * 2000-09-20 2002-03-29 Sanyo Electric Co Ltd Door device for vending machine
US7291946B2 (en) * 2003-01-27 2007-11-06 United Technologies Corporation Damper for stator assembly
TW200827460A (en) * 2006-08-11 2008-07-01 Nippon Steel Corp DR steel sheet and manufacturing method thereof
CA2666319A1 (en) * 2006-10-13 2008-04-17 Magna International Inc. Metal forming with vibration assist
DE102008018656B9 (en) * 2008-04-11 2009-07-09 Thyssenkrupp Steel Ag Process for producing high-volume half-shells
CN101972807A (en) * 2010-10-18 2011-02-16 烟台新科钢结构有限公司 Corrugated plate continuous press-molding production method and equipment thereof
JP5965159B2 (en) * 2012-02-22 2016-08-03 東プレ株式会社 Molding method for press parts
JP5869929B2 (en) * 2012-03-21 2016-02-24 株式会社神戸製鋼所 Rivet forming method for can lid with tab
GB201308927D0 (en) 2013-05-17 2013-07-03 Kraft Foods R & D Inc A beverage preparation system, a capsule and a method for forming a beverage
PT3656259T (en) 2013-05-17 2023-01-03 Douwe Egberts Bv A beverage preparation system, a capsule and a method for forming a beverage
JP6120006B2 (en) * 2014-03-19 2017-04-26 トヨタ紡織株式会社 Metal plate press forming method and press forming apparatus
JP6467791B2 (en) * 2014-06-19 2019-02-13 大日本印刷株式会社 Blank manufacturing method and blanking machine for manufacturing blank
WO2016039102A1 (en) * 2014-09-12 2016-03-17 本田技研工業株式会社 Press forming method and plate material expansion device used in said method
GB201420262D0 (en) 2014-11-14 2014-12-31 Kraft Foods R & D Inc A method of forming a cup-shaped body for a beverage capsule
JP6659380B2 (en) * 2016-01-29 2020-03-04 株式会社神戸製鋼所 Method for manufacturing press-formed product and press-forming apparatus
JP6988136B2 (en) * 2017-04-03 2022-01-05 東洋製罐株式会社 How to make a shell and how to make a can lid
US10946432B2 (en) * 2017-11-29 2021-03-16 Alfons Haar, Inc. Method and apparatus for forming a beaded can end
US20190224739A1 (en) 2018-01-23 2019-07-25 Stolle Machinery Company, Llc Shell with expandable bubble and tooling therefor
US11059091B2 (en) * 2018-01-23 2021-07-13 Stolle Machinery Company, Llc Shell with expandable rivet button and tooling therefor

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US610532A (en) * 1898-09-13 harmatta
CA570608A (en) * 1959-02-17 A. Lyon George Method of and apparatus for making cartridge casings
US756404A (en) * 1902-08-20 1904-04-05 Eugen Polte Method of making hollow metal articles.
FR594670A (en) * 1925-03-07 1925-09-17 Process for obtaining a cone with a thin wall and a thick base
US3750606A (en) * 1970-03-18 1973-08-07 Aluminum Co Of America Rivet fabrication
US3685338A (en) * 1970-04-24 1972-08-22 Krause Ass F A Hem formation
BE793015A (en) * 1971-12-24 1973-04-16 Vaw Ver Aluminium Werke Ag PROCESS FOR MANUFACTURING A HOLLOW RIVET FOR THE ASSEMBLY OF TWO SHEETS
SU435036A1 (en) * 1972-05-22 1974-07-05 Н. Ф. Баранов METHOD OF EXTRACTING SHEET PREPARATIONS ELASTIC PUNCHED
DD108222A1 (en) * 1973-12-20 1974-09-12
DE2619553A1 (en) * 1976-05-04 1977-11-10 Wehrstedt & Soehne Integral aluminium rivet for container - has rivet pressed from container sides in stages from oval section
US4134284A (en) * 1977-06-01 1979-01-16 Achim Nitschke Method and apparatus for the manufacture of hollow bodies
SU1233990A1 (en) * 1984-10-11 1986-05-30 Московский автомеханический институт Method of pressing bottoms
US4685322A (en) * 1985-09-03 1987-08-11 Aluminum Company Of America Method of forming a drawn and redrawn container body
SU1349835A1 (en) * 1986-01-09 1987-11-07 Челябинский Политехнический Институт Им.Ленинского Комсомола Method of drawing hollow articles from sheet blank

Also Published As

Publication number Publication date
ATE105749T1 (en) 1994-06-15
DE69102004D1 (en) 1994-06-23
NO176239C (en) 1995-03-01
NO911287L (en) 1991-10-04
JPH05305360A (en) 1993-11-19
CA2038958A1 (en) 1991-10-04
DK0451013T3 (en) 1994-09-19
FI112331B (en) 2003-11-28
US5174146A (en) 1992-12-29
CA2038958C (en) 1999-07-13
PT97213A (en) 1993-05-31
FI911576A (en) 1991-10-04
KR100231074B1 (en) 1999-12-01
FR2660220A1 (en) 1991-10-04
FR2660220B1 (en) 1995-02-24
PT97213B (en) 1998-07-31
NO911287D0 (en) 1991-04-02
NO176239B (en) 1994-11-21
ES2056595T3 (en) 1994-10-01
FI911576A0 (en) 1991-04-02
DE69102004T2 (en) 1994-10-27
EP0451013A1 (en) 1991-10-09

Similar Documents

Publication Publication Date Title
EP0451013B1 (en) Method and apparatus for making an embossed part in a sheet metal plate and product obtained by this method
US4313545A (en) Metallic pressure vessel with thin wall
EP0733415B1 (en) Method of manufacture of a metal container in a form
FR2605911A1 (en) METHOD AND APPARATUS FOR FORMING CONTAINER END PIECES
US3129496A (en) Method of producing improved vehicle wheels
JPH10128476A (en) Manufacture of deformed metal can having rugged pattern in body part
JP2005530617A (en) Method and apparatus for making can lid shells
US3129505A (en) Process of manufacturing one piece brake drum shells
FR2731927A1 (en) PROCESS FOR PRODUCING A METALLIC SHAPE BOX
FR3061863A1 (en) MAGNETOFORMING PADDING DEVICE AND ASSOCIATED METHOD
EP0310726B1 (en) Manufacturing method of conical metal boxes and tool for carrying out this method
JPH04274834A (en) Method and device for forming single body type rivet on end of container
CA2031859C (en) Die stamping process and device of truncated containers and containers thus obtained
FR2734182A1 (en) METHOD FOR MANUFACTURING A RIVET BODY IN A METAL PLATE
EP0096683A1 (en) Wall-ironed cans
EP0852973B1 (en) Method of making metallic formcans and metallic foodcan made by this method
JP4497736B2 (en) Blank material for forming double-layer products
JP5321774B2 (en) Sealed container lid manufacturing method and sealed container lid
EP0434499A1 (en) Method of producing a non-developable piece from a flat metal plate and workpiece made by this method
JP4565756B2 (en) Blank material for forming double-layer products
JPH09500829A (en) METHOD FOR MANUFACTURING SINGLE COMPONENT COVER FOR VEHICLE FILTER, IN particular OIL FILTER, AND COVER PRODUCED BY THE METHOD
JP2023165497A (en) Can lid and molding method thereof
US866026A (en) Apparatus for forging car-wheels.
SU822950A2 (en) Method of producing hollow thin-walled envelopes with thickened portion
US866020A (en) Method of forging car and like wheels.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19911213

17Q First examination report despatched

Effective date: 19920911

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

REF Corresponds to:

Ref document number: 105749

Country of ref document: AT

Date of ref document: 19940615

Kind code of ref document: T

REF Corresponds to:

Ref document number: 69102004

Country of ref document: DE

Date of ref document: 19940623

ITF It: translation for a ep patent filed

Owner name: INVENTION S.N.C.

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940801

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2056595

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: GR

Ref legal event code: FG4A

Free format text: 3012957

EAL Se: european patent in force in sweden

Ref document number: 91400795.0

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20080313

Year of fee payment: 18

Ref country code: DK

Payment date: 20080314

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20080306

Year of fee payment: 18

Ref country code: GB

Payment date: 20080326

Year of fee payment: 18

Ref country code: NL

Payment date: 20080203

Year of fee payment: 18

Ref country code: LU

Payment date: 20080328

Year of fee payment: 18

Ref country code: IT

Payment date: 20080327

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20080313

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20080418

Year of fee payment: 18

Ref country code: FR

Payment date: 20080311

Year of fee payment: 18

Ref country code: DE

Payment date: 20080407

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GR

Payment date: 20080215

Year of fee payment: 18

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20081013

Year of fee payment: 18

BERE Be: lapsed

Owner name: *SOLLAC

Effective date: 20090331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090325

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

EUG Se: european patent has lapsed
GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20090325

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

Effective date: 20091001

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20091130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090331

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091001

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091001

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090331

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090325

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090331

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091123

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20090326

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20091002

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090326

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090325

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090325

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20090326