EP2125264A1 - 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

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Publication number
EP2125264A1
EP2125264A1 EP07856204A EP07856204A EP2125264A1 EP 2125264 A1 EP2125264 A1 EP 2125264A1 EP 07856204 A EP07856204 A EP 07856204A EP 07856204 A EP07856204 A EP 07856204A EP 2125264 A1 EP2125264 A1 EP 2125264A1
Authority
EP
European Patent Office
Prior art keywords
blanks
spring force
holder
chamber
flangeless
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.)
Granted
Application number
EP07856204A
Other languages
German (de)
French (fr)
Other versions
EP2125264B1 (en
Inventor
Thomas Haar
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.)
Saeta GmbH and Co KG
Original Assignee
Saeta GmbH and Co KG
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
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Application filed by Saeta GmbH and Co KG filed Critical Saeta GmbH and Co KG
Priority to PL07856204T priority Critical patent/PL2125264T3/en
Publication of EP2125264A1 publication Critical patent/EP2125264A1/en
Application granted granted Critical
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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
    • 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 method for deep drawing of blanks made of sheet metal material, which is coated with paint or film material, to flangeless formations 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 flat blanks for forming lids provides a pulling bell and a pulling core around which the pulling bell forms the cup-shaped molding. Because of the diameter reduction already described, wrinkles can form on the edge. Therefore, such a thermoforming tool 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.
  • the invention is based on the object, a method for deep drawing of flat blanks to cup-shaped, flangeless formations, wherein the Blanks of painted or coated with sheet material sheet material to be punched specify, in which the formation of enamel hair and similar phenomena is avoided.
  • the spring force at the fold holder is reduced spontaneously to essentially zero.
  • the method according to the invention is based on the finding that lacquer or foil in the edge region separates from the base material during the blanking out of the sheet metal material.
  • the blanking of the blanks takes place either in advance or simultaneously with the deep drawing by the deep-drawing bell accomplished the punching process.
  • the pleat holder comes into contact with this detached edge region of the coating and does not cause a "chewing effect" at the moment in which the sheet to be drawn leaves the pleated holder, thus causing one more or less strong destruction of this detached edge region, which leads to the formation of the previously mentioned paint hairs.
  • the spring force on the spring holder is made substantially zero, and indeed within a very short time, in e.g. Milliseconds.
  • the point in time at which the spring force on the fold holder is eliminated can be predetermined by the position of the fold holder or the drawing bell. It is understood that this position depends on the geometry of the molded article to be produced.
  • the spring force is successively reduced during the drawing process in order to achieve approximately constant surface pressure between the fold holder and the edge of the mold.
  • the spring force during the drawing operation brings no advantages.
  • the spring force during the drawing operation to increase linearly until spontaneous elimination. This is automatically the case if the volume of a gas cushion is continuously reduced during the drawing process.
  • 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.
  • a drawing tool comprises the known elements, such as the drawing bell, the drawing core and the fold holder, and also a pneumatic spring for the fold holder.
  • the pneumatic spring is formed by a gas volume in a chamber which is closed by a piston.
  • the piston 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 operation.
  • the piston and the pleat holder are automatically adjusted to an upper position and are ready for the next drawing process.
  • Fig. 1 shows schematically a section through a blank for the production of a cylindrical molding.
  • FIG. 2 shows schematically a drawing tool during a drawing process with a blank according to FIG. 1.
  • FIG. 3 schematically shows a spring device for the fold holder of the drawing tool according to FIG. 2.
  • FIG. 4 shows two spring core lines of a spring device for a fold holder of the drawing tool according to FIG. 2.
  • a not necessarily circular blank 10 in Figure 1 consists of a base material 12 and a coating 14.
  • the base material is for example 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.
  • the deep-drawing tool according to FIG. 2 has, for example, a cylindrical pulling core 18, a ring-cylindrical pulling 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 indicated in Figure 2 at 26.
  • FIG. 2 it is indicated how the blank 10 is deep-drawn, in that the edge area is increasingly formed around the pulling core 18 with the aid of the pulling bell 20.
  • the pleat holder 22 abuts against the "inside" of the molded article and prevents the formation of wrinkles in the edge region due to the reduction in the diameter of the material, and the construction and function of such a drawing tool are well known.
  • FIG. 3 shows the force transmission elements 24 according to FIG. 2, which interact 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.
  • gas for example air
  • the piston 28 moves into the chamber 30 and compresses the gas cushion, whereby the spring force at the pleat holder 22 increases approximately linearly.
  • a characteristic curve 32 in which the spring force is indicated as a function of the travel of the piston 28 or of 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.
  • the bottom of the chamber at 36 has an opening which is normally closed by a valve disk 38 which is biased by a spring 40 into 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

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

Verfahren und Vorrichtung zum Tiefziehen von Rohlingen aus Blechmaterial zu flanschlosen Formungen Method and device for deep-drawing blanks made of sheet metal material into flangeless formations
Die Erfindung bezieht sich auf ein Verfahren zum Tiefziehen von Rohlingen aus Blechmaterial, das mit Lack oder Folienmaterial beschichtet ist, zu flanschlosen Formungen nach dem Patentanspruch 1.The invention relates to a method for deep drawing of blanks made of sheet metal material, which is coated with paint or film material, to flangeless formations 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 Formung herum formt. Wegen der bereits beschriebenen Durchmesserreduzierung können sich am Rand Falten ausbilden. Deshalb sieht ein derartiges Tiefziehwerkzeug 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 flat blanks for forming lids provides a pulling bell and a pulling core around which the pulling bell forms the cup-shaped molding. Because of the diameter reduction already described, wrinkles can form on the edge. Therefore, such a thermoforming tool 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 B l 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 Faltenhalter 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.From EP 0 595 417 B1 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 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.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zum Tiefziehen von flachen Rohlingen zu topfförmigen, flanschlosen Formungen, wobei die Rohlinge aus lackiertem oder mit Folienmaterial beschichtetem Blechmaterial gestanzt werden, anzugeben, bei dem die Bildung von Lackhaaren und ähnlichen Erscheinungen vermieden wird.The invention is based on the object, a method for deep drawing of flat blanks to cup-shaped, flangeless formations, wherein the Blanks of painted or coated with sheet material sheet material to be punched specify, in which the formation of enamel hair 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.
Beim erfindungsgemäßen Verfahren wird kurz vor dem Ende des Ziehvorgangs die Federkraft am Faltenhalter spontan im wesentlichen auf Null reduziert.In the method according to the invention, shortly before the end of the drawing process, the spring force at the fold holder is reduced spontaneously to essentially zero.
Es hat sich gezeigt, daß die Bildung von Lackhaaren bei flanschlosen Formungen 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 hairs in flangeless formations is eliminated when near the end of the drawing operation, the force is removed at the pleat holder, i. the edge or the edge of the edge portion abuts the pressure holder substantially without pressure. Flangeless means in the present context that the edge of the blank at the free edge has no flange, i. the edge is cylindrical.
Das erfindungsgemäße Verfahren beruht auf der Erkenntnis, daß während des Ausstanzens 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 method according to the invention is based on the finding that lacquer or foil in the edge region separates from the base material during the blanking out of the sheet metal material. The blanking of the blanks takes place either in advance or simultaneously with the deep drawing by the deep-drawing bell accomplished the punching process. In conventional deep drawing, the pleat holder comes into contact with this detached edge region of the coating and does not cause a "chewing effect" at the moment in which the sheet to be drawn leaves the pleated holder, thus causing one more or less strong destruction of this detached edge region, which leads to the formation of the previously mentioned paint hairs.
Entscheidend für das erfindungsgemäße Verfahren 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, kann durch die Position des Faltenhalters bzw. der Ziehglocke vorgegeben werden. Es versteht sich, daß diese Position von der Geometrie des herzustellenden Formlings abhängt.What is decisive for the method according to the invention is that the spring force on the spring holder is made substantially zero, and indeed within a very short time, in e.g. Milliseconds. The point in time at which the spring force on the fold holder is eliminated can be predetermined by the position of the fold holder or the drawing bell. It is understood that this position depends on the geometry of the molded article to be produced.
Es 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 Kraftübertragungselemente anliegt. Bei einer derartigen Ausführung wird das Gaskissen zur Atmosphäre hin entlüftet, wenn die Federkraft eliminiert werden soll.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 bears against the plunger holder via suitable power transmission elements. 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 eingangs erwähnten 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, erfindungsgemäß wird vorgeschlagen, die Federkraft während des Ziehvorgangs bis zum spontanen Wegfall linear ansteigen zu lassen. 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 mentioned in the introduction, the spring force is successively reduced during the drawing process in order to achieve approximately constant surface pressure between the fold holder and the edge of the mold. In the invention it has been found that a reduction of the spring force during the drawing process brings no advantages. On the contrary, according to the invention proposed that the spring force during the drawing operation to increase linearly until spontaneous elimination. This is automatically the case if the volume of a gas cushion is continuously reduced during the drawing process. 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.
Ein Ziehwerkzeug nach der Erfindung weist die bekannten Elemente, wie Ziehglocke, Ziehkern und Faltenhalter, auf sowie eine pneumatische Feder für den Faltenhalter. Erfϊndungsgemäß 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.A drawing tool according to the invention comprises the known elements, such as the drawing bell, the drawing core and the fold holder, and also a pneumatic spring for the fold holder. Erfϊndungsgemäß 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 Druckaufbau 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 Ziehvorgangs. Dadurch werden der Kolben und der Faltenhalter automatisch in eine obere Position verstellt und sind für den nächsten Ziehvorgang bereit. Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.Since after venting the chamber by ventilation a new pressure build-up 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 operation. As a result, the piston and the pleat holder are automatically adjusted to an upper position and are ready for the next drawing process. An embodiment of the invention will be explained in more detail with reference to drawings.
Fig. 1 zeigt schematisch einen Schnitt durch einen Rohling für die Herstellung eines zylindrischen Formlings.Fig. 1 shows schematically a section through a blank for the production of a cylindrical molding.
Fig. 2 zeigt schematisch ein Ziehwerkzeug während eines Ziehvorgangs mit einem Rohling nach Figur 1.FIG. 2 shows schematically a drawing tool during a drawing process with a blank according to FIG. 1.
Fig. 3 zeigt schematisch eine Federvorrichtung für den Faltenhalter des Ziehwerkzeugs nach Figur 2.3 schematically shows a spring device for the fold holder of the drawing tool according to FIG. 2.
Fig. 4 zeigt zwei Federkernlinien einer Federvorrichtung für einen Faltenhalter des Ziehwerkzeugs nach Figur 2.FIG. 4 shows two spring core lines of a spring device for a fold holder of the drawing tool according to 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 Figure 1 consists of a base material 12 and a coating 14. The base material is for example 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 deep-drawing tool according to FIG. 2 has, for example, a cylindrical pulling core 18, a ring-cylindrical pulling bell 20 and an annular disk-shaped fold holder 22. Such a construction of a deep-drawing tool is generally 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 indicated in Figure 2 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 it is indicated how the blank 10 is deep-drawn, in that the edge area is increasingly formed around the pulling core 18 with the aid of the pulling bell 20. The pleat holder 22 abuts against the "inside" of the molded article and prevents the formation of wrinkles in the edge region due to the reduction in the diameter of the material, and the construction 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 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.FIG. 3 shows the force transmission elements 24 according to FIG. 2, which interact 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. When the pleat holder 22 of FIG. 2 is moved downwardly during the drawing operation, the piston 28 moves into the chamber 30 and compresses the gas cushion, whereby the spring force at the pleat holder 22 increases approximately linearly. This is indicated in FIG. 4 by a characteristic curve 32, in which the spring force is indicated as a function of the travel of the piston 28 or of 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 Figure 3 it is indicated that the bottom of the chamber at 36 has an opening which is normally closed by a valve disk 38 which is biased by a spring 40 into 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

A n s p r ü c h e: Claims:
1. Verfahren zum Tiefziehen von Rohlingen, die aus lackiertem oder mit Folienmaterial beschichtetem Blechmaterial, zum Beispiel aus Stahl oder Aluminium, ausgestanzt werden, zu flanschlosen Formungen, wobei 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 entgegengesetzte Seite des Randes eine vorgegebene Federkraft aufgebracht wird, dadurch gekennzeichnet, daß kurz vor dem Ende des Ziehvorgangs die Federkraft am Faltenhalter spontan im wesentlichen auf Null reduziert wird.1. A method for deep drawing of blanks, which are stamped from painted or sheet material coated sheet material, for example steel or aluminum, to flangeless formations, wherein the blanks by means of a pulling bell of a pulling tool around a pulling core around a cup-shaped part with a flangeless be deformed cylindrical edge and during the formation of the edge of the blanks by means of a pleat holder on the opposite side of the drawing bell of the edge, a predetermined spring force is applied, characterized in that shortly before the end of the drawing process, the spring force on the pleat holder spontaneously reduced to substantially zero becomes.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die Federkraft im Wesentlichen in wenigen Millisekunden auf Null reduziert wird.2. The method according to claim 1, characterized in that the spring force is substantially reduced to zero in a few milliseconds.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Eliminierung der Federkraft erfolgt, wenn der Faltenhalter eine vorgegebene Position erreicht.3. The method according to claim 1 or 2, characterized in that the elimination of the spring force takes place when the fold holder reaches a predetermined position.
4. Verfahren nach einem d er Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Federkraft von einem Gaskissen erzeugt wird und das Gaskissen zur Atmosphäre hin entlüftet wird, wenn der Ziehvorgang kurz vor seinem Ende ist. 4. The method according to one of claims 1 to 3, characterized in that the spring force is generated by a gas cushion and the gas cushion is vented to the atmosphere when the drawing process is nearing its end.
5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß ein das Gaskissen aufnehmender Raum nach dem Entlüften und/oder Auswerfen des Formlings aus dem Ziehwerkzeug erneut mit Gas auf einen vorgegebenen Druck gefüllt wird.5. The method according to claim 4, characterized in that a gas cushion receiving space after venting and / or ejecting the molding from the drawing tool is again filled with gas to a predetermined pressure.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Federkraft während des Ziehvorgangs bis zum spontanen Wegfall linear ansteigt.6. The method according to any one of claims 1 to 5, characterized in that the spring force increases linearly during the drawing process until the spontaneous elimination.
7. Ziehwerkzeug für das Tiefziehen von Rohlingen, die aus lackiertem oder mit Folienmaterial beschichtetem Blechmaterial ausgestanzt werden, zu flanschlosen Formungen, mit einer Ziehglocke, einem Ziehkern, einem Faltenhalter und einer pneumatischen Feder, die eine Federkraft auf den Faltenhalter aufbringt, dadurch gekennzeichnet, daß die pneumatische Feder von einem Gasvolumen in einer Kammer (30) gebildet ist, die von einem Kolben (28) dichtend abgeschlossen ist, der seinerseits über Kraftübertragungselemente (24) am Faltenhalter (22) anliegt und der Kammer (30) ein Entlüftungsventil (38) zugeordnet ist, das betätigt wird, wenn der Kolben (28) eine vorgegebene untere Position erreicht hat, wodurch die Kammer (30) schlagartig entlüftet wird.7. Drawing tool for the deep drawing of blanks, which are stamped from painted or foil material coated sheet material, to flangeless formations, with a drawing bell, a pulling core, a fold holder and a pneumatic spring which applies a spring force to the fold holder, characterized in that the pneumatic spring is formed by a volume of gas in a chamber (30) sealingly closed by a piston (28) which, in turn, rests against the fold holder (22) via power transmission elements (24) and a venting valve (38) in the chamber (30). is assigned, which is actuated when the piston (28) has reached a predetermined lower position, whereby the chamber (30) is vented abruptly.
8. Ziehwerkzeug nach Anspruch 6, dadurch gekennzeichnet, daß das Entlüftungsventil (38) mit einer Stange oder einem Hebel koppelbar ist, welche bzw. welcher in die Kammer (30) hineinsteht und vom Kolben (28) betätigbar ist. 8. Drawing tool according to claim 6, characterized in that the venting valve (38) can be coupled with a rod or a lever, which or which in the chamber (30) in and from the piston (28) is actuated.
9. Ziehwerkzeug nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß eine Druckquelle (46) vorgesehen ist, die über ein Belüftungsventil (48) mit der Kammer (30) verbindbar ist, und eine Steuervorrichtung (50) vorgesehen ist zur Betätigung des Belüftungsventils (48) nach Beendigung des Ziehvorgangs. 9. Drawing tool according to claim 6 or 7, characterized in that a pressure source (46) is provided, which via a vent valve (48) with the chamber (30) is connectable, and a control device (50) is provided for actuating the venting valve (46). 48) after 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

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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

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EP (1) EP2125264B1 (en)
JP (1) JP5141921B2 (en)
CN (1) CN101678428B (en)
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AU (1) AU2007345439B2 (en)
BR (1) BRPI0721214B1 (en)
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DE (2) DE102007005011B4 (en)
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DE502007004524D1 (en) 2010-09-02
RU2009132665A (en) 2011-03-10
CN101678428B (en) 2012-05-30
EP2125264B1 (en) 2010-07-21
MX2009008098A (en) 2009-12-14
BRPI0721214A2 (en) 2014-03-18
AU2007345439B2 (en) 2014-09-04
DK2125264T3 (en) 2010-11-15
ATE474677T1 (en) 2010-08-15
ES2345298T3 (en) 2010-09-20
US9283611B2 (en) 2016-03-15
CN101678428A (en) 2010-03-24
US20100139357A1 (en) 2010-06-10
DE102007005011A1 (en) 2008-08-14
AU2007345439A1 (en) 2008-08-07
JP5141921B2 (en) 2013-02-13
PT2125264E (en) 2010-08-02
WO2008092486A1 (en) 2008-08-07
CA2676966A1 (en) 2008-08-07
DE102007005011B4 (en) 2012-09-06
BRPI0721214B1 (en) 2019-04-30
RU2448799C2 (en) 2012-04-27
CA2676966C (en) 2012-05-22
JP2010517778A (en) 2010-05-27
PL2125264T3 (en) 2010-12-31

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