EP0820360B1 - Temperature control during can body stamping - Google Patents

Temperature control during can body stamping Download PDF

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Publication number
EP0820360B1
EP0820360B1 EP96909955A EP96909955A EP0820360B1 EP 0820360 B1 EP0820360 B1 EP 0820360B1 EP 96909955 A EP96909955 A EP 96909955A EP 96909955 A EP96909955 A EP 96909955A EP 0820360 B1 EP0820360 B1 EP 0820360B1
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EP
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Prior art keywords
flow
tool
turning
process according
controlled
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German (de)
French (fr)
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EP0820360A1 (en
Inventor
Dieter Buse
Willi Grandmann
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Ardagh Metal Packaging Germany GmbH
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Schmalback Lubeca AG
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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
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/20—Deep-drawing
    • B21D22/28—Deep-drawing of cylindrical articles using consecutive dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D51/00—Making hollow objects
    • B21D51/16—Making hollow objects characterised by the use of the objects
    • B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner

Definitions

  • the invention relates to an ironing process to compensate for a mandrel during operation Ironing rings.
  • One is also affected Ironing tool according to the preamble of claim 11, regardless of its application. With the tool and the Ironing processes emerge from operational use Bowls of stretched can bodies, each via an axial one Movement of the mandrel with the respective bowl through several axially lined up ironing rings.
  • the technical field of the invention is forming ("Stretching") cans, both for aluminum sheet and Sheet steel or a combination of both.
  • This Sheets can also have an additional functional coating be provided (e.g. lamination, painting).
  • stretched can bodies are created from bowls, to be closed with a lid in a closing process Cans can be remodeled.
  • a stripping method for controlled change of the can wall thickness in stretched tin cans is (publicly) accessible to the person skilled in the art from US Pat. No. 4,502,313 (Phalin et al).
  • both the stamp and the counter-stamp are provided with feed and discharge channels which are fed by cooling liquids.
  • the temperature of the tools is influenced by controlling the flow speed or flow quantities, a controlled change in the gap between the punch and the counter-punch being possible, intended and also being used in practice, cf. there abstract, last third, column 6, lines 8 to 24.
  • the object of the invention is to reduce the tool consumption with a simplified construction and at the same time to save material for the production of cans.
  • Punch, pestle or ironing ring can both be externally electrical controlled cooled or controlled heated, as well as with in integrated plunger, punch or ironing rings or cooling devices are provided (claim 9).
  • the Ironing tool is temperature controlled - electrically controlled - changeable in its dimensions.
  • Waste material can be reduced when trimming. Can too the trimming process of the upper edge of the can with respect to it Accuracy can be improved.
  • the invention enables such a further development Material savings.
  • the can wall thickness is measured by touch or contact can be controlled, adjusted or at constant values be "controlled” with the "manipulated variable” of the temperature change of tools.
  • FIG. 1 shows a punch 2 or a plunger 1 carrying it, which can be heated by gas-fired ring nozzles 3.
  • the same arrangement can be used for heating or cooling with a fluid.
  • the punch 2 or the plunger carrying it is moved forward in the direction v and takes a cup N with it, which it moves through the extension 9 with or without a hold-down device and also through ironing rings 10a, 10b, 10c, which follow one another along the direction of movement of the Pestle / punch is arranged.
  • a then shaped can D is shown symbolically, which is untrimmed, relative to a floor tool 11, which is used to design the bottom of the untrimmed can.
  • FIG. 2 is a punch 2, which is fastened on a plunger 1 by means of a punch screw (not shown).
  • the ironing principle shown here corresponds to the prior art.
  • Figure 3 shows a further forming tool with a plunger heating by an external radiation effect. In the example, this is done with an infrared radiator 4a.
  • FIG. 6 schematically show heating using heating cartridges or resistors 4 according to the physical principle of resistance heating.
  • the heating can also be carried out with the help of spiral tube cartridges or coiled heating rods 5, also a resistance heating principle.
  • the heating cartridges 4 in FIG. 6 are introduced into the punch 2, it being possible at the same time for the heating cartridges to be integrated into the plunger 1.
  • the plunger can also have coiled heating elements 5a or a circumferential coil 6 for heating from the outside.
  • the electrical supply takes place using cables 10 instead of.
  • the coils 6 can be between the ironing rings 10a, 10b, 10c (instead of spacers) and before and / or lie behind the ring arrangement, cf. Figure 1 and 2.
  • FIG. 7 shows heating of the punches 2 possible with the aid of an external coil arrangement 6a, the heating of the punches or plunger (according to FIG. 6) taking place inductively.
  • the punch or plunger is cooled or heated by passing fluids through it, which as such is the subject of US Pat. No. 4,502,313 (Phalin).
  • the latter has integrated channels 1a, 1b through which a cooling or heating fluid F can be passed.
  • the punch or plunger is heated or cooled using curved contact plates 7a, 7b. They are movable r1, r2.
  • Figure 10 illustrates the cooling or heating of the forming tools or the plunger using the Peltier effect with a Peltier element 8.
  • the temperature is regulated by a defined change in the current I or change in the medium flow F within the plunger in a central channel 2a , 1c.
  • FIG. 11 From FIG. 11 , at least one ring 10a, 10b, 10c (from FIG. 2) is shown, through which a heated or cooled fluid F flows or flows.
  • ring channels 21 are provided in or on the ironing ring shown, for example 10a.
  • At least one ring 10a, 10b, 10c (from FIG. 2) is again heated with the help of spiral tube resistors 22, or the heat is dissipated with corresponding cooling coils 22.
  • FIG. 13 illustrates cooling or heating (K / W) of the auxiliary and operating materials (“forming fluids”) of the “ironing press system” in order to use the different expansion coefficients of ironing rings and punch to compensate for wear on the forming tool.
  • the one for controlling the tool dimensioning (e.g. in Diameter) usable temperature range is between -20 ° C up to 250 ° C (premature tool fatigue and tool breakage limit the temperature range).
  • a temperature difference of 1 ° C corresponds to 0.8 ⁇ m Change in diameter of the ironing mandrel, e.g. B. in carbide as Tool material. That corresponds to the corresponding one Change in wall thickness of the stretched tin can or the extent the possible diameter compensation.
  • Tool dimensions can be used (Ring diameter, mandrel diameter, corresponding Diameter steps or different diameters of the successive rings) can be changed without removal or tool change.
  • the temperature control of the tools for dimensional change is both in manufacturing and in research and Development helpful.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Mounting, Exchange, And Manufacturing Of Dies (AREA)
  • Control Of Temperature (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Control Of Heat Treatment Processes (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Superstructure Of Vehicle (AREA)
  • Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)

Abstract

A method is provided for ironing a cup to a selected wall thickness, using a mandrel that pushes the cup through several ironing rings that are axially aligned with the central axis of the mandrel. The method includes selecting a wall thickness, providing a resistive heater associated with at least one of the punch, the ram and the ironing rings, and controlling a gap between the punch and the ironing rings, and thus the wall thickness of the ironed can body, by setting a temperature of at least one of the punch, the ram and the ironing rings. The temperature is set by controlling electrical current in the resistive heater to provide a controlled gap between the mandrel and ironing rings, to produce a wall thickness of the ironed can body equal to the selected wall thickness when the can body is pushed through the ironing rings by the mandrel.

Description

Die Erfindung betrifft ein Abstreck verfahren zur Kompensation eines im Betrieb eines Abstreckdorns mit Abstreckringen entstehenden Verschleißes. Betroffen ist auch ein Abstreckwerkzeug gemäß dem Oberbegriff des Anspruchs 11, unabhängig von seiner Anwendung. Mit dem Werkzeug und dem Abstreckverfahren entstehen in der betrieblichen Anwendung aus Näpfen jeweils abgestreckte Dosenrümpfe, über eine axiale Bewegung des Dorns mit dem jeweiligen Napf durch mehrere axial aufgereihte Abstreckringe hindurch.The invention relates to an ironing process to compensate for a mandrel during operation Ironing rings. One is also affected Ironing tool according to the preamble of claim 11, regardless of its application. With the tool and the Ironing processes emerge from operational use Bowls of stretched can bodies, each via an axial one Movement of the mandrel with the respective bowl through several axially lined up ironing rings.

Das technische Gebiet der Erfindung ist das Umformen ("Abstrecken") von Dosen, sowohl für Aluminiumblech und Stahlblech oder einem Kombinationswerkstoff von beiden. Diese Bleche können auch mit einer zusätzlichen Funktionsbeschichtung versehen sein (z.B. Laminierung, Lackierung). In diesem technischen Gebiet entstehen aus Näpfen abgestreckte Dosenrümpfe, die mit einem Deckel in einem Verschließvorgang zu verschlossenen Dosen umgestaltet werden.The technical field of the invention is forming ("Stretching") cans, both for aluminum sheet and Sheet steel or a combination of both. This Sheets can also have an additional functional coating be provided (e.g. lamination, painting). In this in the technical field, stretched can bodies are created from bowls, to be closed with a lid in a closing process Cans can be remodeled.

Ein Abstreckverfahren zum gesteuerten Verändern der Dosenwanddicke in abgestreckten Blechdosen ist aus der US-A 4,502,313 (Phalin et al) dem Fachmann (öffentlich) zugänglich. Nach dieser Schrift werden sowohl der Stempel als auch der Gegenstempel mit Zufuhr- und Abfuhrkanälen versehen, die von Kühlflüssigkeiten gespeist werden. Durch die Steuerung der Strömungsgeschwindigkeit bzw. Strömungsmengen wird die Temperatur der Werkzeuge beeinflußt, wobei eine gesteuerte Änderung des Spaltes zwischen dem Stempel und dem Gegenstempel möglich ist, beabsichtigt wird und auch praktisch zur Anwendung kommt, vgl. dort Abstract, letztes Drittel, Spalte 6, Zeilen 8 bis 24. Obwohl diese Schrift auf den ersten Blick eine Steuerung der Umformwerkzeuge in einem Abstreckverfahren offenbart, ist sie konkret nicht darauf gerichtet, das eingangs angegebene Problem der Verschleißkompensation im Betrieb des Abstreckwerkzeuges zu lösen. Dazu sei in der Schrift verwiesen auf drei spezielle Passagen, Spalte 4, Zeilen 46 bis 42, Spalte 5, Zeilen 50 bis 55 und Spalte 6, Zeilen 25 bis 45. Der dort beschriebene Spalt, der mit der Temperatur des strömenden Fluides verändert wird, paßt er sich nur an verändernde Parameter des Materials an, also des Blechnapfes. Bei verändernder Blechdicke im Ausgangswerkstoff werden die Umformwerkzeuge entsprechend nachgestellt.A stripping method for controlled change of the can wall thickness in stretched tin cans is (publicly) accessible to the person skilled in the art from US Pat. No. 4,502,313 (Phalin et al). According to this document, both the stamp and the counter-stamp are provided with feed and discharge channels which are fed by cooling liquids. The temperature of the tools is influenced by controlling the flow speed or flow quantities, a controlled change in the gap between the punch and the counter-punch being possible, intended and also being used in practice, cf. there abstract, last third, column 6, lines 8 to 24. Although this document at first glance reveals control of the forming tools in an ironing process, it is not specifically aimed at solving the problem of wear compensation during operation of the ironing tool. In this regard, reference is made to three special passages in column 4, lines 46 to 42, column 5, lines 50 to 55 and column 6, lines 25 to 45. The gap described there, which is changed with the temperature of the flowing fluid, it only adapts to changing parameters of the material, i.e. the sheet metal bowl. If the sheet thickness changes in the starting material, the forming tools are adjusted accordingly.

Aus einer anderen Quelle, der DE-A 23 32 287 (WMF) ist dem Fachmann ein Tiefziehverfahren zugänglich, bei dem ein Werkzeug zur Verbesserung des Tiefziehverhaltens im Bereich des Ziehringes elektrisch erhitzt und im Bereich des Stempels durch flüssiges Kühlmittel abgekühlt wird. Dort geht es einzig darum, das Tiefziehverhalten des mit dem Werkzeug tiefgezogenen Werkstücks zu verbessern. Dagegen befaßt sich die US-A 5,277,047 (Herdzina) mit der Ritzung an einem Dosendeckel, bei dem der Reststeg der Ritzung innerhalb von vorgegebenen Spezifikationsangaben durch eine elektrische Steuerung der Temperatur gehalten wird. Dieses Verfahren ist vom Wesen her nicht mit einem Abstreckverfahren vergleichbar; die elektrische Steuerung erreicht eine Verschiebung des Unterwerkzeugs als eine Art der mechanischen Werkzeugverstellung, anstelle der Verstellung mit Zahngestängen, Schrittmotoren etc.From another source, DE-A 23 32 287 (WMF), the person skilled in the art can obtain a deep-drawing method in which a tool for improving the deep-drawing behavior in the area of the drawing ring is electrically heated and cooled in the area of the stamp by liquid coolant. It is all about improving the deep-drawing behavior of the workpiece deep-drawn with the tool. On the other hand, US Pat. No. 5,277,047 (Herdzina) is concerned with the scoring on a can lid, in which the remaining web of the scoring is kept within predetermined specifications by an electrical control of the temperature. In essence, this process is not comparable to an ironing process; the electrical control system moves the lower tool as a type of mechanical tool adjustment instead of adjustment with toothed rods, stepper motors etc.

In dem eingangs genannten technischen Gebiet ist es Aufgabe der Erfindung, den Werkzeugverbrauch mit einer vereinfachten Konstruktion zu reduzieren und gleichwohl Material für die Dosenherstellung zu sparen.In the technical field mentioned at the outset, the object of the invention is to reduce the tool consumption with a simplified construction and at the same time to save material for the production of cans.

Diese Aufgabe löst Anspruch 1 oder 11. Mit der Erfindung sind Temperatureinflüsse und Werkzeugverschleiß, die im Betrieb einer Abstreckpresse entstehen, kompensierbar. Ohne eine solche Kompensation wären erhöhte Taktzahlen der Abstreckpresse nicht durchführbar. Die Werkzeugstandzeit jedes Abstreckwerkzeuges kann deutlich erhöht werden, da ein im Betrieb entstehender Verschleiß durch eine Veränderung der Temperatur kompensiert wird, ohne neue Werkzeuge einsetzen zu müssen. Die Kompensation begründet eine längerfristige Verwendbarkeit desselben Werkzeuges und erlaubt es trotz Abnutzung am Werkzeugmaterial (zumeist: Hartmetall), eine abgestreckte Dose mit konstanten, langfristig gleichbleibenden Wanddicken herzustellen. This object is achieved by claim 1 or 11. With the invention Influences of temperature and tool wear that occur during operation of a Ironing press arise, can be compensated. Without one Compensation would not be increased cycle numbers of the ironing press feasible. The tool life of each ironing tool can can be increased significantly as wear occurs during operation is compensated for by a change in temperature without new ones Having to use tools. The compensation justifies one longer-term usability of the same tool and allows it despite wear on the tool material (mostly: hard metal), one stretched can with constant, long-term constant To produce wall thicknesses.

Dies wird mit Hilfe eines beheizten bzw. gekühlten Punches und/oder mit einem beheizten bzw. gekühlten Stößel und/oder beheizten bzw. gekühlten Abstreckringen erreicht. Punch, Stößel oder Abstreckring(e) können sowohl von extern elektrisch gesteuert gekühlt oder gesteuert beheizt werden, als auch mit in dem Stößel, dem Punch oder den Abstreckringen integrierten Heiz- oder Kühleinrichtungen versehen werden (Anspruch 9). Das Abstreckwerkzeug ist über die Temperatur - elektrisch gesteuert - in seinen Maßen veränderbar.This is done with the help of a heated or cooled punches and / or with a heated or cooled plunger and / or heated or cooled ironing rings reached. Punch, pestle or ironing ring (s) can both be externally electrical controlled cooled or controlled heated, as well as with in integrated plunger, punch or ironing rings or cooling devices are provided (claim 9). The Ironing tool is temperature controlled - electrically controlled - changeable in its dimensions.

Bei bekannter Werkzeugtemperatur ϑst und einer bestimmten Werkzeugkonfiguration (gegebene Spaltbreite zwischen Abstreckdorn und Ring) ist eine bestimmte Wanddickenverteilung in der abgestreckten Dose vorhanden. Das definierte (gesteuerte) Aufwärmen bzw. Abkühlen der Werkzeuge führt zur Ausdehnung bzw. Schrumpfung von Abstreckdorn und Ring und einer definierten Änderung der Spaltbreite, womit sich eine steuerbare Wanddicke oder eine Wanddickenverteilungs-Änderung abhängig von der gesteuert gewählten Temperatur ergibt. Die Temperaturbeeinflussung verändert also erfindungsgemäß die Werkzeuggeometrie.With a known tool temperature ϑ st and a certain tool configuration (given gap width between the ironing mandrel and the ring), there is a certain wall thickness distribution in the ironed can. The defined (controlled) heating or cooling of the tools leads to expansion or shrinkage of the ironing mandrel and ring and a defined change in the gap width, which results in a controllable wall thickness or a change in the wall thickness distribution depending on the controlled temperature. The temperature influence thus changes the tool geometry according to the invention.

Mit der Erfindung sind Temperatureinflüsse und Werkzeugverschleiß, die im Betrieb einer Abstreckpresse entstehen, kompensierbar. Ohne diese Kompensation wären erhöhte Taktzahlen der Abstreckmaschinen nicht durchführbar. Daneben wird die Werkzeugstandzeit jedes Abstreckwerkzeugs deutlich erhöht, da Werkzeugverschleiß kompensiert werden kann, ohne neue Werkzeuge einsetzen zu müssen. Die Kompensation begründet eine längerfristige Verwendbarkeit desselben Werkzeugs und erlaubt es trotz (mechanischer) Abnutzung am Werkzeugmaterial (zumeist: Hartmetall) die abgestreckte Dose mit konstanten, langfristig gleichbleibenden Wanddicken herzustellen.With the invention, temperature influences and tool wear, which arise during the operation of a ironing press, can be compensated. Without this compensation, increased cycle numbers of the ironing machines would not be possible. In addition, the tool life of each ironing tool is significantly increased, since tool wear can be compensated for without having to use new tools. The compensation justifies the long-term usability of the same tool and, despite (mechanical) wear on the tool material (mostly: hard metal), allows the ironed can to be manufactured with constant, long-term constant wall thicknesses.

Sowohl das Umformverhalten beim falzen, als auch das Umformverhalten beim Einziehen des oberen Dosenrandes ("reduced neck" oder "necking") werden mit der Erfindung verbessert. Both the forming behavior when folding, and that Forming behavior when pulling in the upper edge of the can ("reduced neck "or" necking ") are improved with the invention.

Beim Trimmen können Materialabfälle reduziert werden. Auch kann der Trimmvorgang des oberen Dosenrandes bezüglich seiner Genauigkeit verbessert werden.Waste material can be reduced when trimming. Can too the trimming process of the upper edge of the can with respect to it Accuracy can be improved.

Mit einer zusätzlich möglichen Verkleinerung des Spezifikationsfensters, welche bei jeder Blechdickenreduzierung des Ausgangsbleches sinnvoll ist, kann beim Einziehen des oberen Abschnittes der Dose unter Zugrundlegung der erfindungsmäßigen Vorschläge eine Dickenreduzierung im übrigen Wandbereich der Dose durchgeführt werden. Die Durchmesservariation beim Einziehen im oberen Dosenabschnitt vom Hauptdurchmesser zu einem reduzierten oberen Durchmesser ("Necking") verhindert im Stand der Technik eine weitere Wanddickenreduzierung.With an additional possible reduction of the Specification window, which applies to every reduction in sheet thickness of the exit plate is useful when pulling in the upper one Section of the can on the basis of the inventive Propose a reduction in thickness in the remaining wall area of the can be performed. The diameter variation when pulling in upper can section from the main diameter to a reduced upper diameter ("necking") prevents in the prior art a further reduction in wall thickness.

Die Erfindung ermöglicht eine solche Weiterentwicklung zur Materialersparnis.The invention enables such a further development Material savings.

Die Dosenwanddicke wird berührend oder berührungslos gemessen und kann gesteuert nachgeführt, eingestellt oder auf konstante Werte "geregelt" werden, mit der "Stellgröße" der Temperaturveränderung der Werkzeuge. The can wall thickness is measured by touch or contact can be controlled, adjusted or at constant values be "controlled" with the "manipulated variable" of the temperature change of tools.

Es folgen Ausführungsbeispiele der Erfindung, die ihr Verständnis vertiefen und ergänzen.The following are examples of execution of the invention, deepen their understanding and complement.

Figur 1 zeigt einen Punch 2 bzw. ein ihn tragenden Stößel 1, die durch gasbefeuerte Ringdüsen 3 erwärmbar sind. Die gleiche Anordnung kann für eine Beheizung bzw. Kühlung mit einem Fluid dienen. Der Punch 2 bzw. der ihn tragende Stößel wird in Richtung v vorwärtsbewegt und nimmt dabei einen Napf N mit, den er durch den Weiterzug 9 mit oder ohne Niederhalter hindurchbewegt und auch durch Abstreckringe 10a,10b,10c hindurchbewegt, die hintereinander entlang der Bewegungsrichtung des Stößels/Punchs angeordnet ist. Symbolisch ist eine dann geformte Dose D gezeigt, die ungetrimmt ist, relativ zu einem Bodenwerkzeug 11, das zur Gestaltung des Bodens der ungetrimmten Dose verwendet wird. FIG. 1 shows a punch 2 or a plunger 1 carrying it, which can be heated by gas-fired ring nozzles 3. The same arrangement can be used for heating or cooling with a fluid. The punch 2 or the plunger carrying it is moved forward in the direction v and takes a cup N with it, which it moves through the extension 9 with or without a hold-down device and also through ironing rings 10a, 10b, 10c, which follow one another along the direction of movement of the Pestle / punch is arranged. A then shaped can D is shown symbolically, which is untrimmed, relative to a floor tool 11, which is used to design the bottom of the untrimmed can.

Figur 2 ist ein Punch 2, der mittels einer (nicht dargestellten) Punchschraube auf einem Stößel 1 befestigt ist. Das hier gezeigte Abstreckprinzip entspricht dem Stand der Technik. FIG. 2 is a punch 2, which is fastened on a plunger 1 by means of a punch screw (not shown). The ironing principle shown here corresponds to the prior art.

Figur 3 zeigt ein weiteres Umformwerkzeug mit einer Stößelerwärmung durch eine externe Strahlungseinwirkung. Im Beispiel erfolgt dies mit einem Infrarotstrahler 4a. Figure 3 shows a further forming tool with a plunger heating by an external radiation effect. In the example, this is done with an infrared radiator 4a.

Figuren 4, 5, 6 zeigen schematisch eine Aufheizung mit Hilfe von Heizpatronen oder -widerständen 4 nach dem physikalischen Wirkprinzip der Widerstandsheizung. Die Aufheizung kann auch mit Hilfe von Wendelrohrpatronen oder gewendelten Heizstäben 5, ebenfalls ein Widerstandheizungsprinzip, durchgeführt werden. Die Heizpatronen 4 in Figur 6 sind in den Punch 2 eingebracht, wobei gleichzeitig eine Integration der Heizpatronen in den Stößel 1 möglich ist. Der Stößel kann auch gewendelte Heizstäbe 5a oder eine umgreifende Wendel 6 zur Erwärmung von außen aufweisen. Figures 4, 5, 6 schematically show heating using heating cartridges or resistors 4 according to the physical principle of resistance heating. The heating can also be carried out with the help of spiral tube cartridges or coiled heating rods 5, also a resistance heating principle. The heating cartridges 4 in FIG. 6 are introduced into the punch 2, it being possible at the same time for the heating cartridges to be integrated into the plunger 1. The plunger can also have coiled heating elements 5a or a circumferential coil 6 for heating from the outside.

Die elektrische Versorgung findet unter Verwendung von Kabeln 10 statt. The electrical supply takes place using cables 10 instead of.

Eine elektrische Versorgung mit Hilfe eines Induktionsverfahrens mit einer Anordnung von Spulen 6 ist möglich, um die Zufuhr-Leitungen entfallen zu lassen. Eine Wendel 5 oder 5a im Werkzeug wäre dann kurzzuschließen.An electrical supply using an induction process with an arrangement of coils 6 is possible to the supply lines to be dropped. A helix 5 or 5a in the tool would then be short-circuited.

Die Spulen 6 können zwischen den Abstreckringen 10a, 10b, 10c (anstelle von Abstandhaltern) untergebracht werden, und auch vor und/oder hinter der Ringanordnung liegen, vgl. Figur 1 und 2.The coils 6 can be between the ironing rings 10a, 10b, 10c (instead of spacers) and before and / or lie behind the ring arrangement, cf. Figure 1 and 2.

Figur 7 zeigt eine Aufheizung des Punches 2 mit Hilfe einer externen Spulenanordnung 6a möglich, wobei die Aufwärmung des Punches bzw. Stößels (nach Figur 6) auf induktivem Wege erfolgt. FIG. 7 shows heating of the punches 2 possible with the aid of an external coil arrangement 6a, the heating of the punches or plunger (according to FIG. 6) taking place inductively.

In Figur 8 wird der Punch bzw. Stößel durch ein Hindurchleiten von Fluiden gekühlt bzw. erwärmt, was als solches in der konstruktiven Gestaltung Gegenstand des US 4,502,313 (Phalin) ist. Bei der abgebildeten Gestaltung des Punch bzw. Stößel hat letzterer integrierte Kanäle 1a,1b, durch welche ein Kühl- bzw. Beheizungsfluid F geführt werden kann.In FIG. 8 , the punch or plunger is cooled or heated by passing fluids through it, which as such is the subject of US Pat. No. 4,502,313 (Phalin). In the illustrated design of the punch or plunger, the latter has integrated channels 1a, 1b through which a cooling or heating fluid F can be passed.

In Figur 9 wird der Punch bzw. Stößel mit Hilfe von gekrümmten Kontaktplatten 7a, 7b erwärmt bzw. gekühlt. Sie sind bewegbar r1, r2.In FIG. 9 , the punch or plunger is heated or cooled using curved contact plates 7a, 7b. They are movable r1, r2.

Figur 10 veranschaulicht die Kühlung bzw. Erwärmung der Umformwerkzeuge bzw. des Stößels unter Verwendung des Peltier-Effekts mit einem Peltier-Element 8. Die Temperaturregulierung erfolgt durch eine definierte Veränderung des Stromes I bzw. Änderung des Mediumstromes F innerhalb des Stößels in einem Zentralkanal 2a, 1c. Figure 10 illustrates the cooling or heating of the forming tools or the plunger using the Peltier effect with a Peltier element 8. The temperature is regulated by a defined change in the current I or change in the medium flow F within the plunger in a central channel 2a , 1c.

Aus der Figur 11 ist mindestens ein Ring 10a,10b,10c (aus Figur 2) gezeigt, der mit einem erwärmten oder gekühlten Fluid F um- bzw. durchströmt wird. Dazu werden Ringkanäle 21 in der oder am gezeigten Abstreckring, beispielsweise 10a, vorgesehen. From FIG. 11 , at least one ring 10a, 10b, 10c (from FIG. 2) is shown, through which a heated or cooled fluid F flows or flows. For this purpose, ring channels 21 are provided in or on the ironing ring shown, for example 10a.

In Figur 12 wird erneut mindestens ein Ring 10a, 10b, 10c (aus Figur 2) mit Hilfe von Wendelrohrwiderständen 22 erwärmt, bzw. die Wärme wird mit entsprechenden Kühlschlangen 22 abgeführt.In FIG. 12 , at least one ring 10a, 10b, 10c (from FIG. 2) is again heated with the help of spiral tube resistors 22, or the heat is dissipated with corresponding cooling coils 22.

Figur 13 veranschaulicht eine Kühlung bzw. Erwärmung (K/W) der Hilfs- und Betriebsstoffe ("Umformsfluiden") des "Systems Abstreckpresse", um die unterschiedlichen Ausdehnungskoeffizienten von Abstreckringen und Punch zur Kompensation von Verschleiß am Umformwerkzeug zu verwenden. FIG. 13 illustrates cooling or heating (K / W) of the auxiliary and operating materials (“forming fluids”) of the “ironing press system” in order to use the different expansion coefficients of ironing rings and punch to compensate for wear on the forming tool.

Ohne Abbildung wird ein Erwärmen bzw. ein Kühlen des Stößels 1 bzw. Punches 2 und/oder entsprechender Abstreckringe 10a,10b,10c mit Hilfe einer oder mehrerer Drosselpatronen offenbart, bei der eine Temperaturveränderung durch eine definierte Änderung der Querschnitte eines Gasstromes erreicht wird (Thomson-Joule-Effekt).Without a picture, heating or cooling of the plunger 1 or punches 2 and / or corresponding ironing rings 10a, 10b, 10c disclosed with the help of one or more choke cartridges, in which a temperature change due to a defined change in the Cross sections of a gas stream is reached (Thomson-Joule effect).

Der zur Steuerung der Werkzeugdimensionierung (z.B. im Durchmesser) verwendbare Temperaturbereich liegt zwischen -20°C bis 250°C (vorzeitige Werkzeugermüdung und Werkzeugbruch begrenzen den Temperaturbereich).The one for controlling the tool dimensioning (e.g. in Diameter) usable temperature range is between -20 ° C up to 250 ° C (premature tool fatigue and tool breakage limit the temperature range).

Eine Temperaturdifferenz von 1°C entspricht 0,8 µm Durchmesseränderung des Abstreckdorns, z. B. bei Hartmetall als Werkzeugmaterial. Das entspricht der dementsprechenden Wanddickenänderung der abgestreckten Blechdose bzw. dem Ausmaß der dadurch möglichen Durchmesserkompensation.A temperature difference of 1 ° C corresponds to 0.8 µm Change in diameter of the ironing mandrel, e.g. B. in carbide as Tool material. That corresponds to the corresponding one Change in wall thickness of the stretched tin can or the extent the possible diameter compensation.

Ist das Abnutzungsausmaß über längerfristige Werkzeugnutzung bekannt - bei bekanntem Werkzeug-Temperaturverhalten -, so kann über Kennlinien langfristig die Temperatur der Umformwerkzeuge verändert werden. Damit wird langfristig und stetig die ebenso stetige Werkzeugabnutzung kompensiert.Is the extent of wear over long-term tool use known - with known tool temperature behavior -, so can The temperature of the forming tools in the long term via characteristic curves to be changed. This will make them constant in the long term constant tool wear compensated.

Neben der Kompensation können kurzfristige Werkzeugabmessungen (Ringdurchmesser, Dorndurchmesser, entsprechende Durchmesserstufen oder unterschiedliche Durchmesser der hintereinander liegenden Ringe) verändert werden, ohne Ausbau oder Werkzeugwechsel.In addition to compensation, short-term tool dimensions can be used (Ring diameter, mandrel diameter, corresponding Diameter steps or different diameters of the successive rings) can be changed without removal or tool change.

Die Temperatursteuerung der Werkzeuge zur Abmessungsänderung ist sowohl in der Fertigung als auch bei der Forschung und Entwicklung hilfreich.The temperature control of the tools for dimensional change is both in manufacturing and in research and Development helpful.

Claims (11)

  1. A flow-turn process for the compensation of the wear arising in operation of a flow-turn pressure tool (1, 2) with flow-turn rings (10a, 10b, 10c), whereby in the flow-turning of a blank (N) a flow-turned can body (D) results from an axial movement of the pressure tool (1, 2) with the blank (N) through several axially aligned flow-turning rings (10a, 10b, 10c), whereby:
       a controlled heating occurs of at least one of the forming tools (1, 2; 10a, 10b, 10c) from a heating device (5, 5a, 6, 21, 22); or a controlled cooling occurs of one of the forming tools by means of a cooling device (8),
    in order to make controlled changes to at least one dimension of the forming tool (1, 2; 10a, 10b, 10c) to counteract the wear arising, so as to be able to use them over a longer period for the production of flow-turned can bodies by flow-turning.
  2. A process according to Claim 1, in which for the control of the can wall thickness the temperature of at least one of the flow-turn forming tools (1, 2; 10a, 10b, 10c) is changed under long term or short term control.
  3. A process according to one of the foregoing Claims, in which the flow-turn pressure tool (1, 2) receives different controlled temperatures along its axial length during the flow-turning of the blank (N).
  4. A process according to one of the foregoing process Claims, in which the temperature range within which the control occurs is ϑst, whereby ϑst lies outside the range of 20°C≤ϑ≤50°C, especially outside 0°C≤ϑ≤70°C.
  5. A process according to one of the foregoing process Claims, in which the temperature changes arising during the flow-turn process owing to mechanical deformation energy on at least one of the forming tools are not controlled temperature changes to compensate for degradation or wear.
  6. A process according to one of the foregoing process Claims, in which the wall thickness of the flow-turned can body is measured, so as to maintain it constant under control.
  7. A process according to Claim 1, in which the maintenance of the wall thickness of the can wall in the operational sequence is attained by the controlled changing of the temperature of the flow-turn pressure tool (1, 2), the punch (2), the ram (1) or the ring (10a, 10b, 10c) of the forming tool.
  8. A process according to Claim 6 or Claim 7, in which the measurement of the thickness of the wall of the flow-turned can body is oriented in the radial direction.
  9. A flow-turning process according to Claim 1, for compensation of a long term can wall thickness change in a metal can (D) flow-turned from a blank (N), whereby
    the controlled heating occurs in accordance with the physical work principle of resistance heating; or
    the controlled cooling of the forming tool is effected by an electrically driven (I) cooling device (8),
    so as to change at least one dimension of the forming tool (1, 2; 10a; 10c, 10b) under electrical control.
  10. A flow-turning process according to Claim 1, whereby the heating device is connected to the forming tool.
  11. A flow-turning tool with a ram or a punch (1, 2) and at least one flow-turning ring (10a, 10b, 10c) for the performance of the process according to one of the foregoing process Claims, characterised in that,
    (a) at least one of the flow-turning rings (10a, 10b, 10c) is force cooled (21, 22) or electrically heated under control, using a device supplied via wires (10); and
    (b) the ram (1) of the flow-turning tool (1) or its forward forming part (2) can be changed in temperature under control by a device from inside (4, 5, 8) or externally (3, 5a, 6, 7a, 7b), in order to control the tool dimensions without mechanical engagement.
EP96909955A 1995-04-13 1996-04-09 Temperature control during can body stamping Expired - Lifetime EP0820360B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19514076 1995-04-13
DE19514076A DE19514076A1 (en) 1995-04-13 1995-04-13 Temperature control when stretching can bodies
PCT/DE1996/000623 WO1996032213A1 (en) 1995-04-13 1996-04-09 Temperature control during can body stamping

Publications (2)

Publication Number Publication Date
EP0820360A1 EP0820360A1 (en) 1998-01-28
EP0820360B1 true EP0820360B1 (en) 2002-02-20

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96909955A Expired - Lifetime EP0820360B1 (en) 1995-04-13 1996-04-09 Temperature control during can body stamping

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US (1) US6263718B1 (en)
EP (1) EP0820360B1 (en)
AT (1) ATE213438T1 (en)
CA (1) CA2218144A1 (en)
CZ (1) CZ293471B6 (en)
DE (2) DE19514076A1 (en)
DK (1) DK0820360T3 (en)
ES (1) ES2173275T3 (en)
PL (1) PL180844B1 (en)
PT (1) PT820360E (en)
WO (1) WO1996032213A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6598451B2 (en) * 2001-11-02 2003-07-29 Sequa Can Machinery, Inc. Internally cooled tool pack
JP5011531B2 (en) * 2007-01-17 2012-08-29 国立大学法人長岡技術科学大学 Deep drawing machine
CN108080518B (en) * 2018-01-15 2019-10-29 内蒙古工业大学 A kind of spinning blank on-line heating device
DE102020112901A1 (en) 2020-05-13 2021-11-18 Tox Pressotechnik Gmbh & Co. Kg Tool and tool holder

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2332287C3 (en) * 1973-06-25 1980-06-04 Wuerttembergische Metallwarenfabrik, 7340 Geislingen Method and device for deep drawing of sheet steel
US4148208A (en) 1977-10-11 1979-04-10 National Can Corporation Method and apparatus for ironing containers
US4502313A (en) * 1982-05-12 1985-03-05 American Can Company Tooling adjustment
JPS61147939A (en) * 1984-12-20 1986-07-05 Agency Of Ind Science & Technol Die for forging
GB2181082B (en) * 1985-10-04 1990-02-07 Metal Box Plc Production of metal cans
JPH0790317B2 (en) * 1989-05-19 1995-10-04 東北三菱自動車部品株式会社 Extrusion molding equipment for forged parts
JPH04100639A (en) * 1990-08-15 1992-04-02 Hitachi Ltd Press forming device and press forming method for zirconium sheet material
JPH05212485A (en) * 1992-02-07 1993-08-24 Citizen Watch Co Ltd Machining method with hot forging die
JPH0655230A (en) * 1992-08-06 1994-03-01 Nippon Steel Corp Deep drawing forming method of magnesium sheet
US5277047A (en) * 1992-09-02 1994-01-11 Service Tool International, Inc. Conversion system tooling heater

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Publication number Publication date
US6263718B1 (en) 2001-07-24
DE59608763D1 (en) 2002-03-28
DK0820360T3 (en) 2002-06-03
ES2173275T3 (en) 2002-10-16
PL180844B1 (en) 2001-04-30
CA2218144A1 (en) 1996-10-17
CZ287897A3 (en) 1999-04-14
CZ293471B6 (en) 2004-05-12
EP0820360A1 (en) 1998-01-28
WO1996032213A1 (en) 1996-10-17
ATE213438T1 (en) 2002-03-15
PT820360E (en) 2002-08-30
PL322748A1 (en) 1998-02-16
DE19514076A1 (en) 1996-10-17

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