EP2125264B1 - Method and device for deep drawing blanks made of sheet metal into flangeless molded blanks - Google Patents

Method and device for deep drawing blanks made of sheet metal into flangeless molded blanks Download PDF

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Publication number
EP2125264B1
EP2125264B1 EP07856204A EP07856204A EP2125264B1 EP 2125264 B1 EP2125264 B1 EP 2125264B1 EP 07856204 A EP07856204 A EP 07856204A EP 07856204 A EP07856204 A EP 07856204A EP 2125264 B1 EP2125264 B1 EP 2125264B1
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EP
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Prior art keywords
blanks
chamber
flangeless
piston
holder
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EP07856204A
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German (de)
French (fr)
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EP2125264A1 (en
Inventor
Thomas Haar
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Saeta GmbH and Co KG
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Saeta GmbH and Co KG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D24/00—Special deep-drawing arrangements in, or in connection with, presses
    • B21D24/10—Devices controlling or operating blank holders independently, or in conjunction with dies
    • B21D24/14—Devices controlling or operating blank holders independently, or in conjunction with dies pneumatically or hydraulically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/22—Deep-drawing with devices for holding the edge of the blanks

Definitions

  • the invention relates to a drawing tool for the deep drawing of blanks made of sheet metal material, which is coated with paint or film material, to flangeless moldings according to claim 1.
  • Lids for containers are usually made by deep-drawing blanks punched from sheets in a deep-drawing die, thereby forming approximately cup-shaped blanks having a top and a skirt portion. Naturally, this leads to a compression of the material in the edge portion due to the reduction of the diameter. Since the material used, in particular steel or aluminum, has a given texture, such deep-drawing operation results in the formation of smaller projections on the free edge. It form so-called ears from (earing).
  • lids for containers that absorb sensitive material or that are filled with korrosions expedindem content it is known to paint the inside of such cover or to provide with any other coating, for example, with foil material.
  • the coating already takes place on the sheet metal material, ie on the sheet metal strip or the sheet metal plates to be punched. This form on the cylindrical or flangeless edge of the deep-drawn lid fine lint or hair-like structures, which are considered to be extremely disadvantageous.
  • the lid within recently heavily contaminate the tool.
  • they can contaminate the contents of a container during the subsequent use of the lid.
  • a typical deep-drawing tool for deep-drawing of flat blanks for the purpose of forming lids provides a drawing bell and a drawing core around which the drawing bell forms the cup-shaped molding. Because of the diameter reduction already described, wrinkles can form on the edge. Therefore, such a Tiefziehtechnikzeng provides a so-called fold holder, which applies under spring force against the edge region. Here, the inside of the edge region lies on the fold holder and thus against the paint or film layer. It has been assumed in the art that the breaking of the material at the end of the stamping process, which is inevitable in particular on harder sheet metal, is the cause of the fraying layer.
  • a spring device for a pleat holder of a drawing tool has become known with which the force of the pleat holder is reduced to the flange of the molding as the deep-drawing process progresses.
  • the surface pressure between the fold holder and the molded article increases with increasing force on the fold holder with increasing force, because the surface of the edge region of the molding cooperating with the fold holder becomes progressively smaller.
  • the surface pressure should be kept approximately the same in the known case.
  • EP-A-0 595 417 For example, there has been known a drawing tool for deep drawing of blanks, comprising a pulling bell, a pulling core, a fold holder or a pneumatic spring which applies a spring force to the fold holder.
  • the invention has for its object to provide an apparatus for deep drawing of flat blanks to cup-shaped, flangeless moldings, wherein the blanks are stamped from painted or sheet material coated with sheet material to create, in which the formation of enamel hairs and similar phenomena is avoided.
  • the spring force on the fold holder is reduced spontaneously to essentially zero.
  • the device according to the invention is based on the knowledge that during the blanking of the blanks from the sheet material lacquer or foil in the edge region is detached from the base material.
  • the blanking of the blanks takes place either in advance or simultaneously with the deep drawing by the Tiefziehglocke accomplished the punching process.
  • the pleat holder comes into contact with this detached edge region of the coating and causes no "chewing effect" at the moment in which the sheet to be drawn leaves the pleat holder. This causes in this way a more or less strong destruction of this detached edge region, which leads to the formation of paint hair already mentioned several times.
  • the spring force on the pen holder is made substantially zero, and indeed within a very short time, in e.g. Milliseconds.
  • the time at which the spring force is eliminated at the fold holder will be determined by the position of the fold holder or the bell. It is understood that this position depends on the geometry of the molded article to be produced.
  • the spring force at the pleat holder by a pneumatic force, for example by a gas cushion closed by a piston, which in turn abuts the pleat holder via suitable force transfer means.
  • the gas cushion is vented to the atmosphere when the spring force is to be eliminated.
  • the spring force is successively reduced during the drawing process to achieve approximately constant surface pressure between the fold holder and edge molding.
  • the spring force is allowed to increase linearly during the drawing process until spontaneous omission. This is automatically the case when the volume of a gas cushion during the drawing process is continuously reduced.
  • the surface pressures are increased during the drawing process, but this partially compensates for the phenomenon that with increasing deformation of the edge region of this thicker and thus a higher spring force is required to counteract the formation of wrinkles.
  • the pneumatic spring is formed by a gas volume in a chamber which is closed by a piston.
  • the piston in turn acts via force transfer elements on the pleat holder, and the chamber is associated with a vent valve, which is actuated when the piston has reached a predetermined lower position, whereby the chamber is vented abruptly.
  • the vent valve, a rod or a lever may be assigned, which is arranged in the chamber and actuated by the piston.
  • a pressure source is provided which is connectable via a vent valve with the chamber.
  • a control device actuates the vent valve after completion of the drawing process. As a result, the piston and the pleat holder are automatically adjusted to an upper position and are ready for the next drawing process.
  • a not necessarily circular blank 10 in FIG. 1 consists of a base material 12 and a coating 14.
  • the base material is for example made of steel or aluminum sheet.
  • the coating 14 is a paint, a plastic film or the like.
  • At 16 it is shown how the coating on the edge of the blank has detached from the base material 12. Such a process occurs during the blanking of the blank 10 from the coated sheet material.
  • thermoforming tool after FIG. 2 has a cylindrical pulling core 18, for example, a cylindrical annular bell 20 and an annular disk-shaped fold holder 22.
  • a cylindrical pulling core 18 is stationary, for example, while the pulling bell 20 by means of a suitable Pressing device, for example, a plunger of an eccentric press is coupled.
  • the pleat holder 22 is in contact at the bottom with power transmission elements 24, which are part of a spring device.
  • the force acting on the force transmission elements 24 spring forces are in FIG. 2 indicated at 26.
  • FIG. 2 is indicated how the blank 10 is deep-drawn by the edge region by means of the drawing bell 20 is increasingly formed around the draw core 18 around.
  • the fold holder 22 abuts against the "inside" of the molding and prevents the formation of wrinkles in the edge region because of the reduction in the diameter of the material. Structure and function of such a drawing tool are well known.
  • FIG. 3 are the power transmission elements 24 after FIG. 2 can be seen, which cooperate with a piston 28 which sits sealed in a cylindrical chamber 30.
  • the chamber 30 is filled with gas, for example air, preferably under a predetermined pressure. If the fold holder 22 after FIG. 2 moves downward during the drawing operation, the piston 28 moves into the chamber 30 and compresses the gas cushion, whereby the spring force at the fold holder 22 increases approximately linearly.
  • FIG. 4 indicated by a characteristic curve 32, in which the spring force is indicated as a function of the travel of the piston 28 and the fold holder 22.
  • a characteristic 34 would be obtained if - as in the prior art mentioned above - the spring force would be reduced continuously as the volume displacement in the chamber 30 progresses.
  • FIG. 3 is indicated that the bottom of the chamber at 36 has an opening which is normally closed by a valve disc 38 which is biased by a spring 40 in the closed position.
  • the valve plate 38 is provided with an actuating rod 42 which projects into the chamber 30, approximately perpendicular to the extension of the piston 28. Reaches the piston 28, the rod 42, the valve 38 is opened, and the air in the chamber 30 can relax abruptly, so that within milliseconds the spring force 26 is eliminated at the fold holder 22.
  • the rod is dimensioned to be actuated by the piston 28 when the squeeze-holder (s) 22 are immediately before their final position during the drawing operation.
  • the chamber 30 is connected via a connection 44 to a pressure source 46 via a valve 48.
  • the valve 48 is actuated by a control device 50 which receives on the one hand via a pressure gauge 52, a pressure signal corresponding to the pressure in the chamber 30, and further receives a further signal above 54, which indicates when the drawing process is completed and the pulling bell 20th is moved back to the starting position.
  • the valve 48 is opened so that the pressure source 46, the chamber 30 can refill with gas predetermined pressure.

Abstract

A method for deep drawing blanks, which are punched out of sheet metal that is painted or coated with film material, for example made of steel or aluminum, into flangeless molded blanks, wherein the blanks are formed to a crucible-shaped part, with a flangeless cylindrical edge, around a drawing core by means of a drawing bell of a drawing die, and a predetermined spring force is applied to the side of the edge opposite to the drawing bell during the forming of the edge of the blanks by means of a blank holder, characterized in that the spring force applied to the blank holder is spontaneously reduced substantially to zero shortly before the end of the drawing process.

Description

Die Erfindung bezieht sich auf ein Ziehwerkzeug für das Tiefziehen von Rohlingen aus Blechmaterial, das mit Lack oder Folienmaterial beschichtet ist, zu flanschlosen Formlingen nach dem Patentanspruch 1.The invention relates to a drawing tool for the deep drawing of blanks made of sheet metal material, which is coated with paint or film material, to flangeless moldings according to claim 1.

Deckel für Behälter werden üblicherweise dadurch hergestellt, daß Rohlinge, die aus Blechtafeln ausgestanzt werden, in einem Tiefziehwerkzeug tiefgezogen werden, wodurch annähernd topfförmige Formlinge gebildet werden mit einem Decken- und einem Randabschnitt. Naturgemäß kommt es dabei zu einer Stauchung des Materials im Randabschnitt aufgrund der Verringerung des Durchmessers. Da das eingesetzte Material, insbesondere Stahl oder Aluminium, eine vorgegebene Textur hat, kommt es beim derartigen Tiefziehvorgang zur Ausbildung von kleineren Vorsprüngen am freien Rand. Es bilden sich sogenannte Zipfel aus (earing).Lids for containers are usually made by deep-drawing blanks punched from sheets in a deep-drawing die, thereby forming approximately cup-shaped blanks having a top and a skirt portion. Naturally, this leads to a compression of the material in the edge portion due to the reduction of the diameter. Since the material used, in particular steel or aluminum, has a given texture, such deep-drawing operation results in the formation of smaller projections on the free edge. It form so-called ears from (earing).

Bei Deckeln für Behälter, die empfindliches Material aufnehmen oder die mit korrosionsförderndem Inhalt befüllt werden, ist bekannt, die Innenseite derartiger Deckel zu lackieren oder mit einer sonstigen Beschichtung zu versehen, beispielsweise mit Folienmaterial. Die Beschichtung erfolgt bereits am Blechmaterial, d.h. am Blechband oder den zu stanzenden Blechtafeln. Dabei bilden sich am zylindrischen bzw. flanschlosen Rand des tiefgezogenen Deckels feine Fussel oder haarähnliche Gebilde aus, welche als äußerst nachteilig betrachtet werden. Dies zum einen, weil derartige "Fussel" binnen kurzem das Werkzeug stark verunreinigen. Zum anderen können sie bei der späteren Anwendung des Deckels den Inhalt eines Behälters verunreinigen.For lids for containers that absorb sensitive material or that are filled with korrosionsförderndem content, it is known to paint the inside of such cover or to provide with any other coating, for example, with foil material. The coating already takes place on the sheet metal material, ie on the sheet metal strip or the sheet metal plates to be punched. This form on the cylindrical or flangeless edge of the deep-drawn lid fine lint or hair-like structures, which are considered to be extremely disadvantageous. On the one hand, because such "lint" within recently heavily contaminate the tool. On the other hand, they can contaminate the contents of a container during the subsequent use of the lid.

Ein typisches Tiefwerkzeug zum Tiefziehen von flachen Rohlingen zwecks Formung von Deckeln sieht eine Ziehglocke und einen Ziehkern vor, um welchen die Ziehglocke den topfförmigen Formling herum formt. Wegen der bereits beschriebenen Durchmesserreduzierung können sich am Rand Falten ausbilden. Deshalb sieht ein derartiges Tiefziehwerkzeng einen sogenannten Faltenhalter vor, der sich unter Federkraft gegen den Randbereich anlegt. Hierbei liegt die Innenseite des Randbereichs auf dem Faltenhalter und damit gegen die Lack- oder Folienschicht an. In der Fachwelt wurde vermutet, daß das insbesondere bei härterem Blech zwangsläufige Brechen des Materials zum Ende der Stanzvorgangs Ursache des ausfransenden Schicht ist.A typical deep-drawing tool for deep-drawing of flat blanks for the purpose of forming lids provides a drawing bell and a drawing core around which the drawing bell forms the cup-shaped molding. Because of the diameter reduction already described, wrinkles can form on the edge. Therefore, such a Tiefziehwerkzeng provides a so-called fold holder, which applies under spring force against the edge region. Here, the inside of the edge region lies on the fold holder and thus against the paint or film layer. It has been assumed in the art that the breaking of the material at the end of the stamping process, which is inevitable in particular on harder sheet metal, is the cause of the fraying layer.

Aus EP 0 595 417 B1 ist eine Federvorrichtung für einen Faltenhalter eines Ziehwerkzeugs bekannt geworden, mit der die Kraft des Faltenhalters auf den Flansch des Formlings bei fortschreitendem Tiefziehvorgang reduziert wird. Bekanntlich nimmt die Flächenpressung zwischen Faltenhalters und Formling mit zunehmendem Verformvorgang bei gleichbleibender Kraft am Faltenhalter zu, weil die mit dem Faltenhalter zusammenwirkende Fläche des Randbereichs des Formlings zunehmend kleiner wird. Durch sukzessive Reduzierung der Kraft am Faltenhalter soll im bekannten Fall die Flächenpressung annähernd gleichgehalten werden.Out EP 0 595 417 B1 For example, a spring device for a pleat holder of a drawing tool has become known with which the force of the pleat holder is reduced to the flange of the molding as the deep-drawing process progresses. As is well known, the surface pressure between the fold holder and the molded article increases with increasing force on the fold holder with increasing force, because the surface of the edge region of the molding cooperating with the fold holder becomes progressively smaller. By successively reducing the force on the fold holder, the surface pressure should be kept approximately the same in the known case.

Aus US-A-5,433,099 ist ein Verfahren zum Tiefziehen von Rohlingen, die aus lackiertem oder mit Folienmaterial beschichtetem Blechmaterial, z.B. aus Stahl oder Aluminium, ausgestanzt werden, bekannt geworden, bei dem die Rohlinge mittels einer Ziehglocke eines Ziehwerkzeugs um einen Ziehkern herum zu einem topfförmigen Teil mit einem flanschlosen zylindrischen Rand verformt werden und während der Formung des Randes der Rohlinge mit Hilfe eines Faltenhalters auf die der Ziehglocke entgegen gesetzten Seite des Randes eine vorgegebene Federkraft aufgebracht wird. Kurz vor dem Ende des Ziehvorgangs wird die Federkraft am Faltenhalter spontan im Wesentlichen auf null reduziert.Out US-A-5,433,099 is a method for deep drawing of blanks, which are stamped from painted or sheet material coated sheet material, such as steel or aluminum, has become known, in which the blanks by means of a drawing bell of a pulling tool around a pulling core around a cup-shaped part with a flangeless cylindrical Edge are deformed and during the formation of the edge of the blanks by means of a pleat holder on the opposite side of the pull bell of the edge a predetermined spring force is applied. Shortly before the end of the drawing process, the spring force on the pleat holder is spontaneously reduced to substantially zero.

Aus EP-A-0 595 417 ist ein Ziehwerkzeug für das Tiefziehen von Rohlingen bekannt geworden, mit einer Ziehglocke, einem Ziehkern, einem Faltenhalter oder einer pneumatischen Feder, die eine federkraft auf den Faltenhalter aufbringt.Out EP-A-0 595 417 For example, there has been known a drawing tool for deep drawing of blanks, comprising a pulling bell, a pulling core, a fold holder or a pneumatic spring which applies a spring force to the fold holder.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Tiefziehen von flachen Rohlingen zu topfförmigen, flanschlosen Formlingen, wobei die Rohlinge aus lackiertem oder mit Folienmaterial beschichtetem Blechmaterial gestanzt werden, zu schaffen, bei der die Bildung von Lackhaaren und ähnliche Erscheinungen vermieden wird.The invention has for its object to provide an apparatus for deep drawing of flat blanks to cup-shaped, flangeless moldings, wherein the blanks are stamped from painted or sheet material coated with sheet material to create, in which the formation of enamel hairs and similar phenomena is avoided.

Diese Aufgabe wird durch die Merkmale des Patentanspruchs 1 gelöst.This object is solved by the features of patent claim 1.

Bei der erfindungsgermäßen Vorrichtung wird kurz vor dem Ende des Ziehvorgangs die Federkraft am Faltenhalter spontan im wesentlichen auf Null reduziert.In the device according to the invention, shortly before the end of the drawing process, the spring force on the fold holder is reduced spontaneously to essentially zero.

Es hat sich gezeigt, daß die Bildung von Lackhaaren bei flanschlosen Formlingen entfällt, wenn nahe dem Ende des Ziehvorgangs die Kraft am Faltenhalter weggenommen wird, d.h. der Rand bzw. die Kante des Randabschnitts im wesentlichen drucklos am. Faltenhalter anliegt. Flanschlos meint im vorliegenden Zusammenhang, daß der Rand des Formlings an der freien Kante keinen Flansch aufweist, d.h. der Rand ist zylindrisch.It has been found that the formation of enamel hair in flangeless moldings is eliminated when near the end of the drawing operation, the force is removed at the fold holder, i. the edge or the edge of the edge portion abuts substantially without pressure on. Fold holder. Flangeless means in the present context that the edge of the blank at the free edge has no flange, i. the edge is cylindrical.

Die erfindungsgemäße Vorrichtung beruht auf der Erkenntnis, daß wähnend des Ausstanzen der Rohlinge aus dem Blechmaterial Lack oder Folie im Randbereich sich vom Basismaterial ablöst. Das Ausstanzen der Rohlinge findet entweder im Vorwege oder gleichzeitig mit dem Tiefziehen statt, indem die Tiefziehglocke den Ausstanzvorgang bewerkstelligt. Beim konventionellen Tiefziehen kommt der Faltenhalter mit diesem abgelösten Randbereich der Beschichtung in Berührung und verursacht keine "Kauwirkung" in dem Augenblick in dem das zu ziehende Blech den Faltenhalter verläßt. Dies bewirkt auf diese Weise eine mehr oder weniger starke Zerstörung dieses abgelösten Randbereichs, was zur Bildung der bereits mehrfach erwähnten Lackhaare führt.The device according to the invention is based on the knowledge that during the blanking of the blanks from the sheet material lacquer or foil in the edge region is detached from the base material. The blanking of the blanks takes place either in advance or simultaneously with the deep drawing by the Tiefziehglocke accomplished the punching process. In conventional deep drawing, the pleat holder comes into contact with this detached edge region of the coating and causes no "chewing effect" at the moment in which the sheet to be drawn leaves the pleat holder. This causes in this way a more or less strong destruction of this detached edge region, which leads to the formation of paint hair already mentioned several times.

Entscheidend für die erfindungsgemäße Vorrichtung ist, daß die Federkraft am Federhalter weitgehend zu null gemacht wird und zwar innerhalb sehr kurzer Zeit, in z.B. Millisekunden. Der Zeitpunkt, an dem die Federkraft am Faltenhalter eliminiert wird, wird durch die Position des Faltenhalters bzw. der Ziehglocke vorgegeben werden. Es versteht sich, daß diese Position von der Geometrie des herzustellenden Formlings abhängt.Decisive for the device according to the invention is that the spring force on the pen holder is made substantially zero, and indeed within a very short time, in e.g. Milliseconds. The time at which the spring force is eliminated at the fold holder, will be determined by the position of the fold holder or the bell. It is understood that this position depends on the geometry of the molded article to be produced.

Wie oben angegeben ist bekannt, die Federkraft am Faltenhalter durch eine pneumatische Kraft bereitzustellen, beispielsweise durch ein Gaskissen, das durch einen Kolben abgeschlossen wird, der seinerseits am Faltenhalter über geeignete Kraftbertragungseleeente anliegt. Bei einer derartigen Ausführung wird das Gaskissen zur Atmosphäre hin entlüftet, wenn die Federkraft eliminiert werden soll.As stated above, it is known to provide the spring force at the pleat holder by a pneumatic force, for example by a gas cushion closed by a piston, which in turn abuts the pleat holder via suitable force transfer means. In such an embodiment, the gas cushion is vented to the atmosphere when the spring force is to be eliminated.

Nach dem Entlüften des Gaskissens ist der das Gaskissen aufnehmende Raum erneut mit Gas zu befüllen, um für den nächsten Ziehvorgang die Federkraft bereitzustellen.After venting the gas cushion, fill the gas cushion receiving space with gas again to provide the spring force for the next drawing operation.

Bei der bekannten Vorrichtung wird die Federkraft während des Ziehvorgangs sukzessive reduziert, um annähernd konstante Flächenpressung zwischen Faltenhalter und Formlingsrand zu erzielen. Bei der Erfindung wurde festgestellt, daß eine Reduktion der Federkraft während des Ziehvorgangs keine Vorteile bringt. Im Gegenteil, bei der Erfindung wird die Federkraft während des Ziehvorgangs bis zum spontanen Wegfall linear ansteigen gelassen. Dies ist automatisch der Fall, wenn das Volumen eines Gaskissens während des Ziehvorgangs kontinuierlich reduziert wird. Dadurch werden die Flächenpressungen während des Ziehvorgangs erhöht, was jedoch die Erscheinung teilweise kompensiert, daß mit zunehmender Verformung des Randbereichs dieser dicker wird und somit eine höhere Federkraft erforderlich ist, der Bildung von Falten zu begegnen.In the known device, the spring force is successively reduced during the drawing process to achieve approximately constant surface pressure between the fold holder and edge molding. In the invention it has been found that a reduction of the spring force during the drawing process brings no advantages. On the contrary, in the invention, the spring force is allowed to increase linearly during the drawing process until spontaneous omission. This is automatically the case when the volume of a gas cushion during the drawing process is continuously reduced. As a result, the surface pressures are increased during the drawing process, but this partially compensates for the phenomenon that with increasing deformation of the edge region of this thicker and thus a higher spring force is required to counteract the formation of wrinkles.

Bei dem erfindungsgemäßen Ziehwerkzeug wird die pneumatische Feder von einem Gasvolumen in einer Kammer gebildet, das von einem Kolben abgeschlossen ist. Der Kolben wirkt seinerseits über Kraftübertragungselemente auf den Faltenhalter, und der Kammer ist ein Entlüftungsventil zugeordnet, das betätigt wird, wenn der Kolben eine vorgegebene untere Position erreicht hat, wodurch die Kammer schlagartig entlüftet wird. Zur Betätigung des Ventils kann nach einer Ausgestaltung der Erfindung dem Entlüftungsventil eine Stange oder ein Hebel zugeordnet sein, die bzw. der in der Kammer angeordnet und vom Kolben betätigbar ist.In the drawing tool according to the invention, the pneumatic spring is formed by a gas volume in a chamber which is closed by a piston. The piston in turn acts via force transfer elements on the pleat holder, and the chamber is associated with a vent valve, which is actuated when the piston has reached a predetermined lower position, whereby the chamber is vented abruptly. For actuation of the valve according to one embodiment of the invention, the vent valve, a rod or a lever may be assigned, which is arranged in the chamber and actuated by the piston.

Da nach dem Entlüften der Kammer durch Belüftung ein neuer Druckautbau erfolgen muß, ist nach einer Ausgestaltung der Erfindung eine Druckquelle vorgesehen, die über ein Belüftungsventil mit der Kammer verbindbar ist. Eine Steuervorrichtung betätigt das Belüftungsventil nach Beendigung des Ziehvorgang. Dadurch werden der Kolben und der Faltenhalter automatisch in eine obere Position verstellt und sind für den nächsten Ziehvorgang bereit.Since after venting the chamber by ventilation a new Druckautbau must be made, according to one embodiment of the invention, a pressure source is provided which is connectable via a vent valve with the chamber. A control device actuates the vent valve after completion of the drawing process. As a result, the piston and the pleat holder are automatically adjusted to an upper position and are ready for the next drawing process.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.

Fig. 1
zeigt schematisch einen Schnitt durch einen Rohling für die Her- stellung eines zylindrischen Formlings.
Fig. 2
zeigt schematisch ein Ziehwerkzeug während eines Ziehvorgangs mit einem Rohling nach Figur 1.
Fig. 3
zeigt schematisch eine Federvorrichtung für den Faltenhalter des Ziehwerkzeugs nach Figur 2.
Fig. 4
zeigt zwei Federkernlinien einer Federvorrichtung für einen Falten- halter des Ziehwerkzeugs nach Figur 2.
An embodiment of the invention will be explained in more detail with reference to drawings.
Fig. 1
shows schematically a section through a blank for the production of a cylindrical molding.
Fig. 2
schematically shows a drawing tool during a drawing process with a blank after FIG. 1 ,
Fig. 3
schematically shows a spring device for the fold holder of the drawing tool after FIG. 2 ,
Fig. 4
shows two spring core lines of a spring device for a folding holder of the drawing tool FIG. 2 ,

Ein nicht notwendigerweise kreisförmiger Rohling 10 in Figur 1 besteht aus einem Basismaterial 12 und einer Beschichtung 14. Das Basismaterial ist zum Beispiel aus Stahl- oder Aluminiumblech. Die Beschichtung 14 ist ein Lack, eine Kunststofffolie oder dergleichen. Bei 16 ist gezeigt, wie sich die Beschichtung am Rand des Rohlings vom Basismaterial 12 abgelöst hat. Ein solcher Vorgang tritt beim Ausstanzen des Rohlings 10 aus dem beschichteten Blechmaterial auf.A not necessarily circular blank 10 in FIG FIG. 1 consists of a base material 12 and a coating 14. The base material is for example made of steel or aluminum sheet. The coating 14 is a paint, a plastic film or the like. At 16 it is shown how the coating on the edge of the blank has detached from the base material 12. Such a process occurs during the blanking of the blank 10 from the coated sheet material.

Das Tiefziehwerkzeug nach Figur 2 weist einen z.B. zylindrischen Ziehkern 18 auf, eine ringzylindrische Ziehglocke 20 sowie einen ringscheibenförmigen Faltenhalter 22. Ein derartiger Aufbau eines Tiefziehwerkzeugs ist allgemein bekannt. Der Ziehkern 18 ist zum Beispiel stationär, während die Ziehglocke 20 mit Hilfe einer geeigneten Preßvorrichtung, beispielsweise einem Stößel einer Exzenterpresse, gekoppelt ist. Der Faltenhalter 22 ist an der Unterseite mit Kraftübertragungselementen 24 in Kontakt, die Teil einer Federvorrichtung sind. Die auf die Kraftübertragungselemente 24 wirkenden Federkräfte sind in Figur 2 bei 26 angedeutet.The thermoforming tool after FIG. 2 has a cylindrical pulling core 18, for example, a cylindrical annular bell 20 and an annular disk-shaped fold holder 22. Such a construction of a thermoforming tool is well known. The pulling core 18 is stationary, for example, while the pulling bell 20 by means of a suitable Pressing device, for example, a plunger of an eccentric press is coupled. The pleat holder 22 is in contact at the bottom with power transmission elements 24, which are part of a spring device. The force acting on the force transmission elements 24 spring forces are in FIG. 2 indicated at 26.

In Figur 2 ist angedeutet, wie der Rohling 10 tiefgezogen wird, indem der Randbereich mit Hilfe der Ziehglocke 20 zunehmend um den Ziehkern 18 herum geformt wird. Der Faltenhalter 22 liegt gegen die "Innenseite" des Formlings an und verhindert die Ausbildung von Falten im Randbereich wegen der Durchmesserreduzierung des Materials. Aufbau und Funktion eines derartigen Ziehwerkzeugs sind allgemein bekannt.In FIG. 2 is indicated how the blank 10 is deep-drawn by the edge region by means of the drawing bell 20 is increasingly formed around the draw core 18 around. The fold holder 22 abuts against the "inside" of the molding and prevents the formation of wrinkles in the edge region because of the reduction in the diameter of the material. Structure and function of such a drawing tool are well known.

In Figur 3 sind die Kraftübertragungselemente 24 nach Figur 2 zu erkennen, die mit einem Kolben 28 zusammenwirken, der abgedichtet in einer zylindrischen Kammer 30 sitzt. Während des Tiefziehvorgangs ist die Kammer 30 mit Gas, zum Beispiel Luft, gefüllt, vorzugsweise unter einem vorgegebenen Druck. Wird der Faltenhalter 22 nach Figur 2 während des Ziehvorgangs nach unten bewegt, bewegt sich der Kolben 28 in die Kammer 30 hinein und komprimiert das Gaskissen, wodurch die Federkraft am Faltenhalter 22 annähernd linear ansteigt. Dies ist in Figur 4 durch eine Kennlinie 32 angedeutet, in der die Federkraft in Abhängigkeit von dem Weg des Kolbens 28 bzw. des Faltenhalters 22 angedeutet ist. Eine Kennlinie 34 würde erhalten, wenn - wie beim eingangs erwähnten Stand der Technik - die Federkraft kontinuierlich mit fortschreitender Volumenverdrängung in der Kammer 30 reduziert werden würde.In FIG. 3 are the power transmission elements 24 after FIG. 2 can be seen, which cooperate with a piston 28 which sits sealed in a cylindrical chamber 30. During the deep-drawing process, the chamber 30 is filled with gas, for example air, preferably under a predetermined pressure. If the fold holder 22 after FIG. 2 moves downward during the drawing operation, the piston 28 moves into the chamber 30 and compresses the gas cushion, whereby the spring force at the fold holder 22 increases approximately linearly. This is in FIG. 4 indicated by a characteristic curve 32, in which the spring force is indicated as a function of the travel of the piston 28 and the fold holder 22. A characteristic 34 would be obtained if - as in the prior art mentioned above - the spring force would be reduced continuously as the volume displacement in the chamber 30 progresses.

In Figur 3 ist angedeutet, daß der Boden der Kammer bei 36 eine Öffnung aufweist, die von einem Ventilteller 38 normalerweise geschlossen wird, der von einer Feder 40 in die Schließstellung vorgespannt ist. Der Ventilteller 38 ist mit einer Betätigungsstange 42 versehen, welche in die Kammer 30 hineinragt, annähernd senkrecht zur Erstreckung des Kolbens 28. Erreicht der Kolben 28 die Stange 42, wird das Ventil 38 geöffnet, und die Luft in der Kammer 30 kann schlagartig entspannen, so daß innerhalb von Millisekunden die Federkraft 26 am Faltenhalter 22 eliminiert ist. Die Stange ist so dimensioniert, daß sie vom Kolben 28 betätigt wird, wenn die Ziehglocke bzw. der Faltenhalter 22 unmittelbar vor ihrer Endposition während des Ziehvorgangs sind.In FIG. 3 is indicated that the bottom of the chamber at 36 has an opening which is normally closed by a valve disc 38 which is biased by a spring 40 in the closed position. The valve plate 38 is provided with an actuating rod 42 which projects into the chamber 30, approximately perpendicular to the extension of the piston 28. Reaches the piston 28, the rod 42, the valve 38 is opened, and the air in the chamber 30 can relax abruptly, so that within milliseconds the spring force 26 is eliminated at the fold holder 22. The rod is dimensioned to be actuated by the piston 28 when the squeeze-holder (s) 22 are immediately before their final position during the drawing operation.

Die Kammer 30 ist über einen Anschluß 44 mit einer Druckquelle 46 über ein Ventil 48 verbunden. Das Ventil 48 wird von einer Steuervorrichtung 50 betätigt, die einerseits über einen Druckmesser 52 ein Drucksignal erhält, das dem Druck in der Kammer 30 entspricht, und ferner ein weiteres Signal über 54 erhält, das angibt, wenn der Ziehvorgang beendet ist und die Ziehglocke 20 in die Ausgangsposition zurückverstellt ist. Zu diesem Zeitpunkt wird das Ventil 48 geöffnet, damit die Druckquelle 46 die Kammer 30 wieder mit Gas vorgegebenen Drucks auffüllen kann.The chamber 30 is connected via a connection 44 to a pressure source 46 via a valve 48. The valve 48 is actuated by a control device 50 which receives on the one hand via a pressure gauge 52, a pressure signal corresponding to the pressure in the chamber 30, and further receives a further signal above 54, which indicates when the drawing process is completed and the pulling bell 20th is moved back to the starting position. At this time, the valve 48 is opened so that the pressure source 46, the chamber 30 can refill with gas predetermined pressure.

Claims (3)

  1. A drawing die for deep drawing blanks which are punched out of sheet metal that is painted or coated with film material into flangeless moulded blanks, with a drawing bell, a drawing core, a blank holder and a pneumatic spring which applies a spring force to the blank holder, characterised in that the pneumatic spring is formed by a gas volume in a chamber (30), which is sealingly closed by a piston (28), which on its part bears against the blank holder (22) by way of force transmission elements (24), and a venting valve (38) is associated to the chamber (30), which is actuated when the piston (28) arrives in a predetermined lower position, whereby the chamber (30) is suddenly vented.
  2. A drawing die according to claim 1, characterised in that the venting valve (38) is adapted to be coupled to a bar or a lever, which projects into the chamber (30) and can be actuated by the piston (28).
  3. A drawing die according to claim 1 or 2, characterised in that a pressure source (46) is provided which can be connected to the chamber (30) via an air valve (48), and a control device (50) is provided for the actuation of the air valve (48) after the completion of the drawing process.
EP07856204A 2007-02-01 2007-11-21 Method and device for deep drawing blanks made of sheet metal into flangeless molded blanks Active EP2125264B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07856204T PL2125264T3 (en) 2007-02-01 2007-11-21 Method and device for deep drawing blanks made of sheet metal into flangeless molded blanks

Applications Claiming Priority (2)

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DE102007005011A DE102007005011B4 (en) 2007-02-01 2007-02-01 Method and drawing tool for deep drawing blanks of sheet metal material to flangeless moldings
PCT/EP2007/010053 WO2008092486A1 (en) 2007-02-01 2007-11-21 Method and device for deep drawing blanks made of sheet metal into flangeless molded blanks

Publications (2)

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EP2125264A1 EP2125264A1 (en) 2009-12-02
EP2125264B1 true EP2125264B1 (en) 2010-07-21

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EP07856204A Active EP2125264B1 (en) 2007-02-01 2007-11-21 Method and device for deep drawing blanks made of sheet metal into flangeless molded blanks

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US (1) US9283611B2 (en)
EP (1) EP2125264B1 (en)
JP (1) JP5141921B2 (en)
CN (1) CN101678428B (en)
AT (1) ATE474677T1 (en)
AU (1) AU2007345439B2 (en)
BR (1) BRPI0721214B1 (en)
CA (1) CA2676966C (en)
DE (2) DE102007005011B4 (en)
DK (1) DK2125264T3 (en)
ES (1) ES2345298T3 (en)
MX (1) MX2009008098A (en)
PL (1) PL2125264T3 (en)
PT (1) PT2125264E (en)
RU (1) RU2448799C2 (en)
WO (1) WO2008092486A1 (en)

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DE102017118559A1 (en) 2017-08-15 2019-02-21 Neoform Flensburg Gmbh & Co. Kg Deep-drawing tool for deep drawing of blanks

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Publication number Publication date
DE502007004524D1 (en) 2010-09-02
ATE474677T1 (en) 2010-08-15
DE102007005011A1 (en) 2008-08-14
CA2676966A1 (en) 2008-08-07
EP2125264A1 (en) 2009-12-02
AU2007345439A1 (en) 2008-08-07
DK2125264T3 (en) 2010-11-15
MX2009008098A (en) 2009-12-14
WO2008092486A1 (en) 2008-08-07
CN101678428B (en) 2012-05-30
US20100139357A1 (en) 2010-06-10
PL2125264T3 (en) 2010-12-31
JP2010517778A (en) 2010-05-27
RU2009132665A (en) 2011-03-10
US9283611B2 (en) 2016-03-15
BRPI0721214A2 (en) 2014-03-18
AU2007345439B2 (en) 2014-09-04
RU2448799C2 (en) 2012-04-27
PT2125264E (en) 2010-08-02
BRPI0721214B1 (en) 2019-04-30
DE102007005011B4 (en) 2012-09-06
CA2676966C (en) 2012-05-22
CN101678428A (en) 2010-03-24
JP5141921B2 (en) 2013-02-13
ES2345298T3 (en) 2010-09-20

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