EP0939047A1 - Method and device for separating metal sheets - Google Patents

Method and device for separating metal sheets Download PDF

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Publication number
EP0939047A1
EP0939047A1 EP99400402A EP99400402A EP0939047A1 EP 0939047 A1 EP0939047 A1 EP 0939047A1 EP 99400402 A EP99400402 A EP 99400402A EP 99400402 A EP99400402 A EP 99400402A EP 0939047 A1 EP0939047 A1 EP 0939047A1
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EP
European Patent Office
Prior art keywords
sheets
stack
upper sheet
sheet
corner
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.)
Withdrawn
Application number
EP99400402A
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German (de)
French (fr)
Inventor
Georges Barakat
Bernard Criqui
Cyril Malarge
Brayima Dakyo
Jean-Philippe Joubert
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.)
Renault SAS
Original Assignee
Renault SAS
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Publication date
Application filed by Renault SAS filed Critical Renault SAS
Publication of EP0939047A1 publication Critical patent/EP0939047A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/16—Separating articles from piles using magnetic force

Definitions

  • the present invention relates to a method and a device for unstacking of sheets.
  • stamping lines In particular for production of motor vehicle bodies, the sheets arrive in packages and are then unstacked and conveyed one after the other to the stamping presses.
  • the first process consists of inserting a threaded rod between the upper sheet to be removed and the rest of the stack of sheets and the second method is to inject pressurized air between the two first sheets of the stack of sheets by the use of flat spouts placed at the edge of the stack of sheets.
  • the oil film which covers the sheets can be broken and the sheet can be separated and removed for example thanks to suction cups.
  • the friction of the threaded rod on the sheets removes material and spreads chips on their faces, thus degrading the condition of the sheets for subsequent operations by example of painting.
  • the transverse movement mechanism of the threaded rod at the edge of the sheet pile must have elements complex and bulky mechanical due to variations in straightness stacks of sheets.
  • the object of the present invention is to try to remedy the above disadvantages of the solutions currently used.
  • the present invention firstly relates to a method of unstacking of sheets placed one above the other and forming a battery, which consists in generating a magnetic field in a part adjacent to the edges of the top sheet of the stack of sheets, so to generate field lines especially in the plane of the sheet top of the stack of sheets, to circulate an electric current in the upper sheet of the stack of sheets substantially perpendicular to said field lines, so as to cause a raising of the edge of the upper sheet of the stack of sheets.
  • the method according to the invention consists, in addition, in lifting the sheet upper part of the sheet pile and remove it.
  • the process according to the invention preferably consists, after the abovementioned resulting bearing from the edge of the upper sheet of the pile of sheets, to keep raised and / or lift the part adjacent to this edge of this upper sheet then lift the central part of the sheet to purposes of its removal.
  • the method according to the invention preferably consists in generating the aforementioned magnetic field in a corner part of the stack of sheets so as to produce field lines in arcs extending between the edges determining said corner of the upper sheet of the stack of sheets.
  • the method according to the invention preferably consists in making circulate an electric current in the upper sheet of the stack of sheets along and in the area of the edges of this upper sheet determining said corner.
  • the present invention also relates to a device for unstacking of sheets placed one above the other and forming a pile, in particular for the implementation of the above method, which of preference includes two permanent magnets arranged along the edges delimiting a corner of the stack of sheets, in the upper part of this battery, a magnetic flux return circuit joining by outside said permanent magnets, and retractable means carrying at least two electrodes bearing at a distance one of the other on the upper sheet of the stack of sheets and likely to be connected to a source of electric current, the magnetizations of said permanent magnets being perpendicular to said edges of the stack of sheets, their own likings being perpendicular.
  • said electrodes preferably come resting on the upper sheet of the stack of sheets under the effect of springs.
  • said retractable means comprise at least one retractable arm carrying at least one electrode located in the area of said corner of the upper sheet of the stack of sheets and at at least one electrode located at a distance from said corner electrode and in the vicinity of one of said edges of the upper sheet.
  • said retractable means comprise preferably a lifting suction cup arranged in the area of the corner of the upper sheet of the stack of sheets.
  • the unstacking device comprises, in complement, means for taking the upper sheet from the pile of sheets and remove it, which include at least one suction cup placed in the central part of this upper sheet.
  • the unstacking device shown in the figures which is generally identified by the reference 1, is intended to constitute an aid for unstacking the upper sheet 2 of a stack of sheets 3 of rectangular shape, arranged on an air cushion not shown.
  • the device 1 is placed in a corner of the stack of sheets 2 and includes two permanent magnets 4 and 5 which extend horizontally along two adjacent sides of the stack of sheets 3, determining a corner 6, in the vicinity of this corner, and which exceeds slightly above it, so that the adjacent edges 7 and 8 of the upper sheet 2 extend laterally to magnets 4 and 5.
  • Permanent magnets 4 and 5 are integral with a circuit magnetic flow return 9 which is set square outside permanent magnets 4 and 5.
  • the magnetizations of permanent magnets 4 and 5 are perpendicular to the edges 7 and 8 of the sheet 2 and the magnetization of the magnet 4 is obtained by a rotation of 90 ° with respect to that of magnet 5 counterclockwise.
  • the device 1 further comprises a retractable support 11 which is carried by an operating arm 12 so that it can be arranged above and at a distance from the corner 6 of the stack of sheets 3.
  • the support 11 carries two vertical electrodes 13 and 14 which cross and which are subjected downwards to the effect of springs 15 and 16 to come to rest on the upper sheet 2, as well as a suction cup 17 which is connected to an external vacuum circuit 18.
  • Electrodes 13 and 14 are electrically connected by a horizontal connection bar 19 on which is connected an electrical connection braid 20.
  • the retractable support 11 carries two arms 21 and 22 which extend respectively parallel to the edges 7 and 8 of the sheet 2, in direction of its other corners opposite corner 6.
  • the ends of the horizontal arms 21 and 22 carry vertical electrodes 23 and 24 which extend downwards so that that their lower ends come to rest on the upper sheet 2 of the stack of sheets 3, near its edges 7 and 8 and at a distance from the electrodes 13 and 14. On electrodes 23 and 24 are also connected electrical braids 25 and 26.
  • the electrical braid 20 connected to the electrodes of corner 13 and 14 and on the other hand the electrical braids 25 and 26 connected to the edge electrodes 23 and 24 are respectively connected to the two poles 27 and 28 of a current source 29 shown in FIG. 6.
  • This current source 29 includes a transformer 30 which is powered by an alternating current source 31 and which is connected to a rectifier circuit 32 via an inductor 33, the output rectifier circuit 32 being connected to poles 27 and 28.
  • a diode bridge 34 is also connected to poles 27 and 28, this bridge making the current source 29 insensitive to short circuits which may occur at the contact points of the electrodes above with the upper plate 2.
  • a device for taking and removal 35 can be arranged in the upper central part of the stack of sheets 3 and carries four suction cups 36.
  • the device 1 which has just been described can be used from the next way.
  • the retractable support 11 is brought into the position described previously, so that the lower ends of the electrodes 13 and 14 and the suction cup are in contact with the face upper of the upper sheet 2 of the stack of sheets 3, in the corner 6 of the latter, and that the lower ends of the electrodes 23 and 24 are also in contact with the upper face of the upper sheet 2, away from corner 6.
  • the springs 15 and 16 and the suction cup 17 are constructed of so as to exert bearing forces on the upper face of the sheet upper 2 which are as low as possible.
  • the current source 29 is switched on. N is established then a passage of electric current mainly in the sheet upper 2 between the corner electrodes 13 and 14 and the electrodes of edge 23 and 24.
  • the current lines thus established extend substantially perpendicular to the magnetic field lines 10 produced by permanent magnets 4 and 5.
  • the vacuum circuit 18 is established.
  • the suction cup 17 produces then its effect and certainly raises the corner 6 of the sheet 2.
  • the vacuum circuit is established suction cups 36 of the removal device 35 to cause the total lifting of the upper plate 2 with respect to the rest of the pile of sheets 3.
  • the device 1 is insensitive variations in the straightness of the top sheet 2 to be removed from the stack of sheets 3, that it tolerates variations in vertical positioning of the stack of sheets 3, that it exerts no effort liable to deteriorate the sheets of the stack of sheets 3 and that, because of its simplicity, can be easily integrated into a production line.

Abstract

The sheets are separated using permanent magnets (4,5) to create a magnetic field near the edges of the top sheet (2) of the stack (3), then causing an electric current to circulate in the top sheet by means of two electrodes (13,23) placed at a distance one from the other on the top sheet. The interaction with the magnetic field lifts the top sheet to separate it from the stack.

Description

La présente invention concerne un procédé et un dispositif de dépilage de tôles.The present invention relates to a method and a device for unstacking of sheets.

Sur les chaines d'emboutissage, en particulier pour la réalisation de caisses de véhicules automobiles, les tôles arrivent en paquets et sont ensuite dépilées et convoyées les unes après les autres vers les presses d'emboutissage.On stamping lines, in particular for production of motor vehicle bodies, the sheets arrive in packages and are then unstacked and conveyed one after the other to the stamping presses.

Lorsque les tôles sont en une matière ferromagnétique, le décollage de la tôle supérieure de la pile de tôles est assuré par l'effet magnétique exercé par des aimants permanents placés en périphérie de la pile de tôles. Aujourd'hui cependant, pour des raisons diverses, on emboutit également, sur les mêmes chaínes d'emboutissage, des tôles en aluminium qui sont amagnétiques de telle sorte que les aimants permanents précités ne produisent pas d'effet.When the sheets are made of ferromagnetic material, the take-off of the upper sheet from the stack of sheets is ensured by the effect magnetic exerted by permanent magnets placed on the periphery of the stack of sheets. Today however, for various reasons, we also stamps, on the same stamping lines, sheet metal aluminum which are non-magnetic so that the magnets aforementioned perms have no effect.

Pour y remédier, le décollage de tôles amagnétiques est jusqu'à ce jour assuré par deux types de procédé.To remedy this, takeoff of non-magnetic sheets is up to date ensured by two types of process.

Le premier procédé consiste en l'insertion d'une tige filetée entre la tôle supérieure à enlever et le reste de la pile de tôles et le second procédé consiste à injecter de l'air sous pression entre les deux premières tôles de la pile de tôles par l'utilisation de becs plats placés au bord de la pile de tôles. Ainsi, le film d'huile qui recouvre les tôles peut être rompu et la tôle peut être séparée et enlevée par exemple grâce à des ventouses.The first process consists of inserting a threaded rod between the upper sheet to be removed and the rest of the stack of sheets and the second method is to inject pressurized air between the two first sheets of the stack of sheets by the use of flat spouts placed at the edge of the stack of sheets. Thus, the oil film which covers the sheets can be broken and the sheet can be separated and removed for example thanks to suction cups.

Ces solutions connues présentent cependant des inconvénients.These known solutions have drawbacks, however.

Dans la solution par insertion, le frottement de la tige filetée sur les tôles enlève de la matière et répand des copeaux sur leurs faces, dégradant ainsi l'état des tôles pour les opérations ultérieures par exemple de peinture. De plus, le mécanisme de déplacement transversal de la tige filetée au bord de la pile de tôles doit comporter des éléments mécaniques complexes et encombrants du fait des variations de rectitude des piles de tôles.In the solution by insertion, the friction of the threaded rod on the sheets removes material and spreads chips on their faces, thus degrading the condition of the sheets for subsequent operations by example of painting. In addition, the transverse movement mechanism of the threaded rod at the edge of the sheet pile must have elements complex and bulky mechanical due to variations in straightness stacks of sheets.

Dans la solution par injection d'air, on retrouvre le même inconvénient que dans la solution précédente en ce qui concerne le positionnement des becs de soufflage. De plus, cette solution exige l'installation de tuyaux à air comprimé dans le voisinage des paquets de tôles.In the solution by air injection, we find the same downside than in the previous solution regarding the positioning of the blowing nozzles. In addition, this solution requires the installation of compressed air hoses in the vicinity of the packages of sheets.

Le but de la présente invention est de tenter de remédier aux inconvénients ci-dessus des solutions actuellement utilisées.The object of the present invention is to try to remedy the above disadvantages of the solutions currently used.

La présente invention a tout d'abord pour objet un procédé de dépilage de tôles placées les unes au-dessus des autres et formant une pile, qui consiste à générer un champ magnétique dans une partie adjacente aux bords de la tôle supérieure de la pile de tôles, de manière à générer des lignes de champ notamment dans le plan de la tôle supérieure de la pile de tôles, à faire circuler un courant électrique dans la tôle supérieure de la pile de tôles sensiblement perpendiculairement auxdites lignes de champ, de manière à provoquer un relèvement du bord de la tôle supérieure de la pile de tôles.The present invention firstly relates to a method of unstacking of sheets placed one above the other and forming a battery, which consists in generating a magnetic field in a part adjacent to the edges of the top sheet of the stack of sheets, so to generate field lines especially in the plane of the sheet top of the stack of sheets, to circulate an electric current in the upper sheet of the stack of sheets substantially perpendicular to said field lines, so as to cause a raising of the edge of the upper sheet of the stack of sheets.

Après quoi, le relèvement résultant précité s'étant produit, le procédé selon l'invention consiste, en complément, à soulever la tôle supérieure de la pile de tôles et à l'enlever.After which, the aforementioned resulting bearing having occurred, the method according to the invention consists, in addition, in lifting the sheet upper part of the sheet pile and remove it.

Le procédé selon l'invention consiste de préférence, après le relèvement résultant précité du bord de la tôle supérieure de la pile de tôles, à maintenir soulevée et/ou soulever la partie adjacente à ce bord de cette tôle supérieure puis à soulever la partie centrale de la tôle aux fins de son enlèvement.The process according to the invention preferably consists, after the abovementioned resulting bearing from the edge of the upper sheet of the pile of sheets, to keep raised and / or lift the part adjacent to this edge of this upper sheet then lift the central part of the sheet to purposes of its removal.

Le procédé selon l'invention consiste de préférence à générer le champ magnétique précité dans une partie en coin de la pile de tôles de manière à produire des lignes de champ en arcs s'étendant entre les bords déterminant ledit coin de la tôle supérieure de la pile de tôles.The method according to the invention preferably consists in generating the aforementioned magnetic field in a corner part of the stack of sheets so as to produce field lines in arcs extending between the edges determining said corner of the upper sheet of the stack of sheets.

Le procédé selon l'invention consiste de préférence à faire circuler un courant électrique dans la tôle supérieure de la pile de tôles le long et dans la zone des bords de cette tôle supérieure déterminant ledit coin.The method according to the invention preferably consists in making circulate an electric current in the upper sheet of the stack of sheets along and in the area of the edges of this upper sheet determining said corner.

La présente invention a également pour objet un dispositif de dépilage de tôles placées les unes au-dessus des autres et formant une pile, en particulier pour la mise en oeuvre du procédé ci-dessus, qui de préference comprend deux aimants permanents disposés le long des bords délimitant un coin de la pile de tôles, dans la partie supérieure de cette pile, un circuit magnétique de retour de flux joignant par l'extérieur lesdits aimants permanents, et des moyens escamotables portant au moins deux électrodes venant en appui à distance l'une de l'autre sur la tôle supérieure de la pile de tôles et susceptible d'être reliées à une source de courant électrique, les aimantations desdits aimants permanents étant perpendiculaires auxdits bords de la pile de tôles, leurs aimentations propres étant perpendiculaires.The present invention also relates to a device for unstacking of sheets placed one above the other and forming a pile, in particular for the implementation of the above method, which of preference includes two permanent magnets arranged along the edges delimiting a corner of the stack of sheets, in the upper part of this battery, a magnetic flux return circuit joining by outside said permanent magnets, and retractable means carrying at least two electrodes bearing at a distance one of the other on the upper sheet of the stack of sheets and likely to be connected to a source of electric current, the magnetizations of said permanent magnets being perpendicular to said edges of the stack of sheets, their own likings being perpendicular.

Selon l'invention, lesdites électrodes viennent de préférence en appui sur la tôle supérieure de la pile de tôles sous l'effet de ressorts.According to the invention, said electrodes preferably come resting on the upper sheet of the stack of sheets under the effect of springs.

Selon l'invention, lesdits moyens escamotables comprennent au moins un bras escamotable portant au moins une électrode située dans la zone dudit coin de la tôle supérieure de la pile de tôles et au moins une électrode située à distance de ladite électrode de coin et dans le voisinage de l'un desdits bords de la tôle supérieure.According to the invention, said retractable means comprise at least one retractable arm carrying at least one electrode located in the area of said corner of the upper sheet of the stack of sheets and at at least one electrode located at a distance from said corner electrode and in the vicinity of one of said edges of the upper sheet.

Selon l'invention, lesdits moyens escamotables comprennent de préférence une ventouse de soulèvement disposée dans la zone du coin de la tôle supérieure de la pile de tôles.According to the invention, said retractable means comprise preferably a lifting suction cup arranged in the area of the corner of the upper sheet of the stack of sheets.

Selon l'invention, le dispositif de dépilage comprend, en complément, des moyens pour prendre la tôle supérieure de la pile de tôles et l'enlever, qui comprennent au moins une ventouse placée dans la partie centrale de cette tôle supérieure.According to the invention, the unstacking device comprises, in complement, means for taking the upper sheet from the pile of sheets and remove it, which include at least one suction cup placed in the central part of this upper sheet.

La présente invention sera mieux comprise à l'étude d'un dispositif de dépilage de tôles amagnétiques, décrit à titre d'exemple non limitatif et illustré par le dessin sur lequel :

  • la figure 1 représente une vue en perspective d'un dispositif de dépilage de tôles selon la présente invention ;
  • la figure 2 représente une vue de côté du dispositif précité, partiellement en coupe ;
  • la figure 3 représente une vue de dessus partielle du dispositif précité ;
  • la figure 4 représente une vue de dessus d'un coin de la pile de tôles ;
  • la figure 5 représente, en perspective, un coin de la pile de tôles ;
  • et la figure 6 représente un schéma électrique d'alimentation du dispositif précité.
The present invention will be better understood from the study of a device for unstacking non-magnetic sheets, described by way of non-limiting example and illustrated by the drawing in which:
  • Figure 1 shows a perspective view of a sheet unstacking device according to the present invention;
  • 2 shows a side view of the above device, partially in section;
  • Figure 3 shows a partial top view of the above device;
  • Figure 4 shows a top view of a corner of the stack of sheets;
  • Figure 5 shows, in perspective, a corner of the stack of sheets;
  • and FIG. 6 represents an electrical diagram for supplying the aforementioned device.

Le dispositif de dépilage représenté sur les figures, qui est repéré d'une manière générale par la référence 1, est destiné à constituer une aide au dépilage de la tôle supérieure 2 d'une pile de tôles 3 de forme rectangulaire, disposée sur un coussin d'air non représenté.The unstacking device shown in the figures, which is generally identified by the reference 1, is intended to constitute an aid for unstacking the upper sheet 2 of a stack of sheets 3 of rectangular shape, arranged on an air cushion not shown.

Le dispositif 1 est disposé dans un coin de la pile de tôles 2 et comprend deux aimants permanents 4 et 5 qui s'étendent horizontalement le long de deux flancs adjacents de la pile de tôles 3, déterminant un coin 6, dans le voisinage de ce coin, et qui dépasse légèrement au-dessus, de telle sorte que les bords adjacents 7 et 8 de la tôle supérieure 2 s'étendent latéralement aux aimants 4 et 5.The device 1 is placed in a corner of the stack of sheets 2 and includes two permanent magnets 4 and 5 which extend horizontally along two adjacent sides of the stack of sheets 3, determining a corner 6, in the vicinity of this corner, and which exceeds slightly above it, so that the adjacent edges 7 and 8 of the upper sheet 2 extend laterally to magnets 4 and 5.

Les aimants permanents 4 et 5 sont solidaires d'un circuit magnétique 9 de retour de flux qui est disposé en équerre à l'extérieur des aimants permanents 4 et 5.Permanent magnets 4 and 5 are integral with a circuit magnetic flow return 9 which is set square outside permanent magnets 4 and 5.

Les aimantations des aimants permanents 4 et 5 sont perpendiculaires aux bords 7 et 8 de la tôle 2 et l'aimantation de l'aimant 4 est obtenue par une rotation de 90° par rapport à celle de l'aimant 5 dans le sens contraire des aiguilles d'une montre.The magnetizations of permanent magnets 4 and 5 are perpendicular to the edges 7 and 8 of the sheet 2 and the magnetization of the magnet 4 is obtained by a rotation of 90 ° with respect to that of magnet 5 counterclockwise.

Ainsi, comme le montre la figure 4, on peut obtenir dans le coin 6, plus particulièrement de la tôle supérieure 2, des lignes de champ 10 en arcs quasi circulaires qui s'étendent entre les bords 7 et 8 de la tôle 2, le module du champ magnétique présent dans la tôle 2 décroissant en partant de son coin 6.Thus, as shown in Figure 4, we can get in the corner 6, more particularly of the upper sheet 2, lines of field 10 in almost circular arcs which extend between edges 7 and 8 of sheet 2, the module of the magnetic field present in sheet 2 decreasing from its corner 6.

Le dispositif 1 comprend en outre un support escamotable 11 qui est porté par un bras de manoeuvre 12 de manière à pouvoir être disposé au-dessus et à distance du coin 6 de la pile de tôles 3.The device 1 further comprises a retractable support 11 which is carried by an operating arm 12 so that it can be arranged above and at a distance from the corner 6 of the stack of sheets 3.

Le support 11 porte deux électrodes verticales 13 et 14 qui le traversent et qui sont soumises vers le bas à l'effet de ressorts 15 et 16 pour venir en appui sur la tôle supérieure 2, ainsi qu'une ventouse 17 qui est reliée à un circuit extérieur à dépression d'air 18.The support 11 carries two vertical electrodes 13 and 14 which cross and which are subjected downwards to the effect of springs 15 and 16 to come to rest on the upper sheet 2, as well as a suction cup 17 which is connected to an external vacuum circuit 18.

Les parties supérieures des électrodes 13 et 14 sont électriquement reliées par une barre horizontale de connexion 19 sur laquelle est branchée une tresse de connexion électrique 20. The upper parts of electrodes 13 and 14 are electrically connected by a horizontal connection bar 19 on which is connected an electrical connection braid 20.

Le support escamotable 11 porte deux bras 21 et 22 qui s'étendent respectivement parallèlement aux bords 7 et 8 de la tôle 2, en direction de ses autres coins opposés au coin 6.The retractable support 11 carries two arms 21 and 22 which extend respectively parallel to the edges 7 and 8 of the sheet 2, in direction of its other corners opposite corner 6.

Les extrémités des bras horizontaux 21 et 22 portent des électrodes verticales 23 et 24 qui s'étendent vers le bas de telle sorte que leurs extrémités inférieures viennent en appui sur la tôle supérieure 2 de la pile de tôles 3, au voisinage de ses bords 7 et 8 et à distance des électrodes 13 et 14. Sur les électrodes 23 et 24 sont également branchées des tresses de connexion électrique 25 et 26.The ends of the horizontal arms 21 and 22 carry vertical electrodes 23 and 24 which extend downwards so that that their lower ends come to rest on the upper sheet 2 of the stack of sheets 3, near its edges 7 and 8 and at a distance from the electrodes 13 and 14. On electrodes 23 and 24 are also connected electrical braids 25 and 26.

D'une part, la tresse électrique 20 reliée aux électrodes de coin 13 et 14 et d'autre part les tresses électriques 25 et 26 reliées aux électrodes de bord 23 et 24 sont respectivement reliées aux deux pôles 27 et 28 d'une source de courant 29 représentée sur la figure 6.On the one hand, the electrical braid 20 connected to the electrodes of corner 13 and 14 and on the other hand the electrical braids 25 and 26 connected to the edge electrodes 23 and 24 are respectively connected to the two poles 27 and 28 of a current source 29 shown in FIG. 6.

Cette source de courant 29 comprend un transformateur 30 qui est alimenté par une source de courant alternatif 31 et qui est relié à un circuit redresseur 32 par l'intermédiaire d'une inductance 33, la sortie du cicuit redresseur 32 étant reliée aux pôles 27 et 28. En parallèle, un pont de diodes 34 est également branché sur les pôles 27 et 28, ce pont permettant de rendre insensible la source de courant 29 aux court-circuits pouvant se produire à l'endroit des contacts des électrodes précitées avec la tôle supérieure 2.This current source 29 includes a transformer 30 which is powered by an alternating current source 31 and which is connected to a rectifier circuit 32 via an inductor 33, the output rectifier circuit 32 being connected to poles 27 and 28. In parallel, a diode bridge 34 is also connected to poles 27 and 28, this bridge making the current source 29 insensitive to short circuits which may occur at the contact points of the electrodes above with the upper plate 2.

En se reportant à la figure 3, on voit qu'un appareil de prise et d'enlèvement 35 peut être disposé dans la partie centrale supérieure de la pile de tôles 3 et porte quatre ventouses 36.Referring to FIG. 3, it can be seen that a device for taking and removal 35 can be arranged in the upper central part of the stack of sheets 3 and carries four suction cups 36.

Le dispositif 1 qui vient d'être décrit peut être utilisé de la manière suivante.The device 1 which has just been described can be used from the next way.

On amène l'appareil d'enlèvement 35 au-dessus de la partie centrale de la pile de tôles 3 de telle sorte que ses ventouses 36 soient en contact avec la face supérieure de la tôle supérieure 3.Take the removal device 35 above the part central of the stack of sheets 3 so that its suction cups 36 are in contact with the upper face of the upper plate 3.

On amène le support escamotable 11 dans la position décrite précédemment, de telle sorte que les extrémités inférieures des électrodes 13 et 14 et la ventouse soient en contact avec la face supérieure de la tôle supérieure 2 de la pile de tôles 3, dans le coin 6 de cette dernière, et que les extrémités inférieures des électrodes 23 et 24 soient également en contact avec la face supérieure de la tôle supérieure 2, à distance du coin 6.The retractable support 11 is brought into the position described previously, so that the lower ends of the electrodes 13 and 14 and the suction cup are in contact with the face upper of the upper sheet 2 of the stack of sheets 3, in the corner 6 of the latter, and that the lower ends of the electrodes 23 and 24 are also in contact with the upper face of the upper sheet 2, away from corner 6.

Les ressorts 15 et 16 et la ventouse 17 sont construits de manière à exercer des forces d'appui sur la face supérieure de la tôle supérieure 2 qui soient le plus faible possible.The springs 15 and 16 and the suction cup 17 are constructed of so as to exert bearing forces on the upper face of the sheet upper 2 which are as low as possible.

Ensuite, on met en marche la source de courant 29. n s'établit alors un passage de courant électrique principalement dans la tôle supérieure 2 entre les électrodes de coin 13 et 14 et les électrodes de bord 23 et 24. Les lignes de courant ainsi établies s'étendent sensiblement perpendiculairement aux lignes de champ magnétique 10 produites par les aimants permanents 4 et 5.Next, the current source 29 is switched on. N is established then a passage of electric current mainly in the sheet upper 2 between the corner electrodes 13 and 14 and the electrodes of edge 23 and 24. The current lines thus established extend substantially perpendicular to the magnetic field lines 10 produced by permanent magnets 4 and 5.

Le coin 6 de la tôle supérieure 2 subit alors des forces vers le haut qui provoquent son soulèvement ou décollage par pelage comme le montre la figure 5, provoquant avec une faible opposition une remontée des électrodes 13 et 14 à l'encontre des ressorts 15 et 16 et une légère compression de la partie inférieure de la ventouse 17.The corner 6 of the upper sheet 2 then undergoes forces towards the high that cause it to lift or peel off like the shows Figure 5, causing with slight opposition a rise electrodes 13 and 14 against springs 15 and 16 and a slight compression of the lower part of the suction cup 17.

Juste après ou en même temps que le passage du courant électrique, et au moins tant que le coin 6 de la tôle supérieure 2 est relevé, on établit le circuit à dépression 18. La ventouse 17 produit alors son effet et relève franchement le coin 6 de la tôle 2.Right after or at the same time as the current flow electric, and at least as long as the corner 6 of the upper sheet 2 is raised, the vacuum circuit 18 is established. The suction cup 17 produces then its effect and frankly raises the corner 6 of the sheet 2.

En même temps ou ensuite, on établit le circuit à dépression des ventouses 36 de l'appareil d'enlèvement 35 pour provoquer le soulèvement total de la tôle supérieure 2 par rapport au reste de la pile de tôles 3.At the same time or later, the vacuum circuit is established suction cups 36 of the removal device 35 to cause the total lifting of the upper plate 2 with respect to the rest of the pile of sheets 3.

La tôle supérieure 2 étant soulevée complètement, on peut couper la source de courant 29 et relâcher la ventouse de coin 11, puis escamoter le support escamotable 11, vers le haut et/ou vers le côté de la pile de tôles 3 puis actionner l'appareil 35 de manière à emmener la tôle supérieure 2 enlevée à son endroit de destination.With the upper plate 2 raised completely, you can cut the power source 29 and release the corner suction cup 11, then retract the retractable support 11, upwards and / or to the side of the sheet metal stack 3 then activate the device 35 so as to bring the upper sheet 2 removed at its destination.

La tôle supérieure 2 étant complètement enlevée, on peut redisposer à nouveau le dispositif 1 dans la position décrite précédemment en vue de l'enlèvement de la tôle supérieure suivante de la pile de tôles 3.With the top plate 2 completely removed, you can redispose the device 1 again in the position described previously for the removal of the next upper sheet from the stack of sheets 3.

Bien entendu, des dispositifs équivalents pourront être prévus dans au moins l'un des autres coins de la pile de tôle 3.Of course, equivalent devices may be provided in at least one of the other corners of the sheet metal stack 3.

Il résulte de ce qui précède que le dispositif 1 est insensible aux variations de la rectitude de la tôle supérieure 2 à enlever de la pile de tôles 3, qu'il tolère des variations de positionnement vertical de la pile de tôles 3, qu'il n'exerce aucun effort susceptible de déteriorer les tôles de la pile de tôles 3 et qu'il peut, vu sa simplicité, être facilement intégré dans une chaíne de production.It follows from the above that the device 1 is insensitive variations in the straightness of the top sheet 2 to be removed from the stack of sheets 3, that it tolerates variations in vertical positioning of the stack of sheets 3, that it exerts no effort liable to deteriorate the sheets of the stack of sheets 3 and that, because of its simplicity, can be easily integrated into a production line.

Claims (11)

Procédé de dépilage de tôles placées les unes au-dessus des autres et formant une pile, caractérisé par le fait qu'il consiste : à générer un champ magnétique dans une partie adjacente aux bords de la tôle supérieure (2) de la pile de tôles (3), de manière à générer des lignes de champ notamment dans le plan de la tôle supérieure de la pile de tôles, à faire circuler un courant électrique dans la tôle supérieure (2) de la pile de tôles (3) sensiblement perpendiculairement auxdites lignes de champ, de manière à provoquer un relèvement du bord de la tôle supérieure de la pile de tôles. Process for unstacking sheets placed one above the other and forming a stack, characterized in that it consists: generating a magnetic field in a part adjacent to the edges of the upper sheet (2) of the stack of sheets (3), so as to generate field lines in particular in the plane of the upper sheet of the stack of sheets, circulating an electric current in the upper sheet (2) of the stack of sheets (3) substantially perpendicular to said field lines, so as to cause a raising of the edge of the upper sheet of the stack of sheets. Procédé selon la revendication 1, caractérisé par le fait qu'il consiste, le relèvement résultant précité s'étant produit, à soulever la tôle supérieure de la pile de tôles et à l'enlever.Method according to claim 1, characterized in that that it consists, the aforementioned resulting bearing having occurred, to raise the top sheet of the stack of sheets and remove it. Procédé selon l'une des revendications 1 et 2, caractérisé par le fait qu'il consiste, après le relèvement résultant précité du bord de la tôle supérieure de la pile de tôles, à maintenir soulevée et/ou soulever la partie adjacente à ce bord de cette tôle supérieure puis à soulever la partie centrale de la tôle aux fins de son enlèvement.Method according to one of claims 1 and 2, characterized by the fact that it consists, after the aforementioned resulting raising of the edge of the upper sheet of the stack of sheets, to keep it raised and / or lift the part adjacent to this edge of this upper sheet then to lift the central part of the sheet for removal. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé par le fait qu'il consiste à générer le champ magnétique précité dans une partie en coin (6) de la pile de tôles (3) de manière à produire des lignes de champ en arcs s'étendant entre les bords (7, 8) déterminant ledit coin de la tôle supérieure de la pile de tôles.Process according to any one of Claims 1 to 3, characterized by the fact that it consists in generating the magnetic field mentioned above in a corner part (6) of the stack of sheets (3) so as to producing field lines in arcs extending between edges (7, 8) determining said corner of the upper sheet of the stack of sheets. Procédé selon la revendication 4, caractérisé par le fait qu'il consiste à faire circuler un courant électrique dans la tôle supérieure de la pile de tôles le long et dans la zone des bords de cette tôle supérieure déterminant ledit coin.Method according to claim 4, characterized in that that it consists in circulating an electric current in the sheet top of the stack of sheets along and in the edge area of this upper sheet determining said corner. Dispositif de dépilage de tôles placées les unes au-dessus des autres et formant une pile, en particulier pour la mise en oeuvre du procédé selon l'une quelconque des revendications précédentes, caractérisé par le fait qu'il comprend : deux aimants permanents (4, 5) disposés le long des bords (7, 8) délimitant un coin (6) de la pile de tôles (3), dans la partie supérieure de cette pile, un circuit magnétique de retour de flux (9) joignant par l'extérieur lesdits aimants permanents, et des moyens escamotables (11) portant au moins deux électrodes (13, 23) venant en appui à distance l'une de l'autre sur la tôle supérieure (2) de la pile de tôles (3) et susceptible d'être reliées à une source de courant électrique (29). Device for unstacking sheets placed one above the other and forming a stack, in particular for implementing the method according to any one of the preceding claims, characterized in that it comprises: two permanent magnets (4, 5) arranged along the edges (7, 8) delimiting a corner (6) of the stack of sheets (3), in the upper part of this stack, a magnetic flux return circuit (9) joining said permanent magnets from the outside, and retractable means (11) carrying at least two electrodes (13, 23) bearing at a distance from one another on the upper sheet (2) of the stack of sheets (3) and capable of being connected to a source of electric current (29). Dispositif selon la revendication 6, caractérisé par le fait que les aimantations desdits aimants permanents (4, 5) sont perpendiculaires auxdits bords (7, 8) de la pile de tôles (3), leurs aimentations propres étant perpendiculaires.Device according to claim 6, characterized in that that the magnetizations of said permanent magnets (4, 5) are perpendicular to said edges (7, 8) of the stack of sheets (3), their proper likings being perpendicular. Dispositif selon l'une des revendications 6 et 7, caractérisé par le fait que lesdites électrodes viennent en appui sur la tôle supérieure (2) de la pile de tôles sous l'effet de ressorts (15).Device according to one of claims 6 and 7, characterized by the fact that said electrodes come to bear on the upper sheet (2) of the stack of sheets under the effect of springs (15). Dispositif selon l'une quelconque des revendications 6 à 8, caractérisé par le fait que lesdits moyens escamotables comprennent au moins un bras escamotable portant au moins une électrode (13) située dans la zone dudit coin (6) de la tôle supérieure (2) de la pile de tôles (3) et au moins une électrode (23) située à distance de ladite électrode de coin (13) et dans le voisinage de l'un desdits bords (7) de la tôle supérieure (2).Device according to any one of Claims 6 to 8, characterized in that said retractable means comprise at least one retractable arm carrying at least one electrode (13) located in the area of said corner (6) of the upper sheet (2) of the stack of sheets (3) and at least one electrode (23) located at a distance from said electrode corner (13) and in the vicinity of one of said edges (7) of the sheet upper (2). Dispositif selon l'une quelconque des revendications 6 à 9, caractérisé par le fait que lesdits moyens escamotables comprennent une ventouse de soulèvement (17) disposée dans la zone du coin de la tôle supérieure de la pile de tôles.Device according to any one of Claims 6 to 9, characterized in that said retractable means comprise a lifting suction cup (17) disposed in the corner area of the upper sheet of the stack of sheets. Dispositif selon l'une quelconque des revendications 6 et 10, caractérisé par le fait qu'il comprend des moyens (35) pour prendre la tôle supérieure (2) de la pile de tôles et l'enlever, qui comprennent au moins une ventouse (36) placée dans la partie centrale de cette tôle supérieure.Device according to any one of claims 6 and 10, characterized in that it comprises means (35) for take the upper sheet (2) from the stack of sheets and remove it, which comprise at least one suction cup (36) placed in the central part of this upper sheet.
EP99400402A 1998-02-27 1999-02-19 Method and device for separating metal sheets Withdrawn EP0939047A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9802418 1998-02-27
FR9802418A FR2775473B1 (en) 1998-02-27 1998-02-27 METHOD AND DEVICE FOR STACKING SHEETS

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WO2002008100A1 (en) * 1999-04-26 2002-01-31 Asm, S.A. Device for separating, lifting and moving aluminum sheets or other non-ferromagnetic material
GB2462499A (en) * 2008-08-15 2010-02-17 Cocatalyst Ltd Improvements to non-ferrous sheet transport systems
DE102016123492B4 (en) 2015-12-04 2020-06-18 GM Global Technology Operations LLC PACKING DEVICE FOR THE AUTOMATED HANDLING OF IRON-FREE METAL OBJECTS
DE102016123360B4 (en) 2015-12-04 2020-06-25 Gm Global Technology Operations, Llc MAGNETODYNAMIC DEVICE

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002008100A1 (en) * 1999-04-26 2002-01-31 Asm, S.A. Device for separating, lifting and moving aluminum sheets or other non-ferromagnetic material
US6746063B1 (en) 1999-04-26 2004-06-08 Albert Redo Sanchez Device for separating, lifting and moving aluminium sheets or other non-ferromagnetic material
GB2462499A (en) * 2008-08-15 2010-02-17 Cocatalyst Ltd Improvements to non-ferrous sheet transport systems
DE102016123492B4 (en) 2015-12-04 2020-06-18 GM Global Technology Operations LLC PACKING DEVICE FOR THE AUTOMATED HANDLING OF IRON-FREE METAL OBJECTS
DE102016123360B4 (en) 2015-12-04 2020-06-25 Gm Global Technology Operations, Llc MAGNETODYNAMIC DEVICE

Also Published As

Publication number Publication date
FR2775473A1 (en) 1999-09-03
FR2775473B1 (en) 2000-04-07

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