EP0279269A2 - Method of making a drawn can of sheet metal - Google Patents

Method of making a drawn can of sheet metal Download PDF

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Publication number
EP0279269A2
EP0279269A2 EP88101419A EP88101419A EP0279269A2 EP 0279269 A2 EP0279269 A2 EP 0279269A2 EP 88101419 A EP88101419 A EP 88101419A EP 88101419 A EP88101419 A EP 88101419A EP 0279269 A2 EP0279269 A2 EP 0279269A2
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EP
European Patent Office
Prior art keywords
step edge
edge
flange
deep
diameter
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
EP88101419A
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German (de)
French (fr)
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EP0279269A3 (en
EP0279269B1 (en
Inventor
Werner Erfgen
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Rasselstein AG
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Rasselstein AG
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Publication date
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Priority to AT88101419T priority Critical patent/ATE75975T1/en
Publication of EP0279269A2 publication Critical patent/EP0279269A2/en
Publication of EP0279269A3 publication Critical patent/EP0279269A3/en
Application granted granted Critical
Publication of EP0279269B1 publication Critical patent/EP0279269B1/en
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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
    • 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
    • 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 producing a deep-drawn tin from sheet metal, with a step edge adjoining the cylindrical can body by means of an optionally multi-part step edge pulling ring with a pull opening, the diameter of which corresponds approximately to the outer diameter of the can body, and with a provided at its inlet end, in Diameter larger than the step opening formed step edge recess, and by means of an optionally multi-part step edge stamp with a stamp part corresponding to the inside diameter of the can body and with a step step part with a larger diameter, firstly a cup having a flat flange is deep-drawn, the inside diameter and height of the inside diameter and the Height of the can body of the finished deep-drawn can corresponds, and then by means of the step edge part and the step edge recess using a hold-down acting on the flange, a part of the flange below Leaving a remaining flange to the step edge is formed.
  • Thermoformed cans made of sheet metal with a step edge are preferably used when a full tear-open lid serves as a closure.
  • the ring-shaped cover edge connected to the can by a fold remains on the can.
  • the opening diameter of the lid edge would then be smaller than the inside diameter of the can, which leads to difficulties when emptying pasty filling goods in particular.
  • the deep-drawn cans made of aluminum sheet with a step edge are produced in the above-mentioned known method in one stroke, the sheet running freely over the step edge recess of the step edge pulling ring during the deep-drawing of the can body.
  • sheet steel especially those with a small thickness and high hardness, e.g. Double-reduced steel sheet, which was cold-rolled after recrystallization annealing with a high degree of re-rolling of over 15%, wrinkles appear on the deep-drawn can.
  • the invention is therefore based on the object of demonstrating a method for producing a deep-drawn box made of sheet metal, with a step edge of the type mentioned at the top adjoining the cylindrical can body, with which it is possible to produce such deep-drawn boxes made of bare or painted steel sheets, in particular those with smaller dimensions Manufacture thickness and greater hardness, especially from double-reduced steel sheet, without wrinkles.
  • the bowl in the preliminary stage can first be drawn out in one or more deep-drawing tools.
  • This advanced cup is then brought into a tool with a step edge ring and in this tool a part of the flange is then formed into the step edge in a further step.
  • the step edge drawing ring therefore, only part of the flange is deformed into the step edge.
  • both stages can also be carried out in a single, multi-stage tool, however, the same principle is used, in the preliminary stage the bowl, consisting of the can body and flange, is deep-drawn in a tool part (drawing ring) that has no step edge.
  • a second tool part which contains the step edge recess, is covered by the first tool part and is therefore ineffective. Only when the bowl production is completed in the preliminary stage is the first tool part displaced, for example, against the force of a spring and the step edge recess of the second tool part is released, as a result of which a part of the flange can then be formed into the step edge in the further step.
  • a cup N is first deep-drawn in a conventional manner from a sheet steel plate of small thickness s. Of, for example, 0.17 mm and high hardness of about 60 to 70 HR30T, which then has a flat flange 2 on its can body 1 .
  • This bowl can be produced in one stop train and, if necessary, one or more further trains.
  • the inside diameter D of the bowl N and its height H should correspond to the inside diameter D and the height H of the deep-drawing box T shown on the right in FIG.
  • the deep-drawn bowl N is then formed into the finished deep-drawn box T by means of the tool shown in FIG.
  • This tool has a step edge drawing ring 3 with a drawing opening 4, the diameter D1 of which, taking into account a sufficient drawing gap, corresponds approximately to the outside diameter of the can body 1.
  • a step edge recess 5 At the inlet end 3a of the step edge drawing ring 3 there is also a step edge recess 5, the diameter D2 of which is larger than the diameter D1 of the drawing opening.
  • the tool consists of a step edge stamp 6 with a first stamp part 7, the diameter D3 of which corresponds approximately to the inside diameter D of the can body 1 and with a step edge part 8 which is larger in diameter D4.
  • the tool has a hold-down device 10 loaded by a relatively weak spring 9 on. The force of the spring 9 is approximately 700 to 800 N with a can diameter D of 66 mm.
  • the bowl N manufactured in a preliminary stage is introduced into the step edge drawing ring 3 of the tool described, as is shown on the left in FIG. 1.
  • the flat flange 2 is clamped between the step edge drawing ring 3 and the hold-down device 10.
  • the step edge stamp 6 which first enters the can body 1 of the bowl N with its stamp part 7, a part of the flange 2 is deformed under the effect of the step edge part 8 by deep drawing to the desired step edge 11 on the finished deep-drawing box T, as shown in FIG. 1 is shown on the right.
  • a small remaining flange 2a is left at the outer end of the step edge 11, which later takes into account the manufacture of the can board, taking into account a trimming allowance.
  • the can body 1 is not changed in its diameter D and also in its height H by the stamp part 7 when the step edge is formed, since this stamp part 7 has an axial length which is substantially smaller than the height H of the can body 1.
  • the remaining flange 2a can then be cut so that an annular can rim is formed, the radial width of which is the same across its entire circumference.
  • the step edge production and trimming can, however, also take place in one tool according to FIG. 2 or 3.
  • a tool has, according to FIG. 2, a step edge pulling ring 3 'which is surrounded concentrically by a counter-holding ring 13 supported by a spring 12.
  • the hold-down ring 10 ' encloses a pressure ring 14, on which the spring 9 acts.
  • the stepped rim drawing ring 3 are 'and the stages edge punches 6 formed in the same manner as the step edge draw ring 3 and the step edge punch 6 in the illustrated in Figure 1 embodiment, so for parts with the same function the same reference numerals have been used and the above' description applies mutatis mutandis.
  • the flange 2 of the cup is clamped in a slightly resilient manner between the end faces of the step edge pull ring 3 ', counter holder 13, hold-down device 10' and pressure ring 14.
  • the step edge stamp 6 then forms part of the flange 2 into the step edge 11.
  • the step edge forming is immediately followed by a last phase in which a flange 17 connected to the step edge stamp 6 presses directly on the hold-down device 10 ', as is the case is shown on the right in FIG.
  • the remaining flange 2a is trimmed under the interaction of the two cutting edges 15, 16, the counter-holder 13 evading against the force of the spring 12.
  • the step edge pull ring 3 " likewise surrounded concentrically by a counter-holder 18, in which case an annular cutting edge 19 is arranged on the counter-holder 18.
  • the step edge pulling ring 3 " is supported by a spring 20.
  • a concentric cutting ring 21 with an annular cutting edge 22 is provided in the hold-down ring 10".
  • the hold-down ring 10 "and the trimming ring 21 are initially acted upon by the pressure pins 24 loaded by the springs 23, as a result of which the flange 2 of the cup N between the end faces of the step edge pull ring 3", counter-holder 18, hold-down device 10 "and trimming ring 21 under the action of the springs 23
  • parts of the same function are again identified with the same reference numerals as in FIG. 1.
  • the remaining flange 2a is trimmed immediately, this taking place under the cooperation of the trimming edges 19, 22 when the cutting ring 21 has come to rest on the shoulder 25 of the step edge stamp.
  • the step edge pull ring 3 "deflects in the axial direction against the force of the spring 20.
  • the bowl N is produced, the step edge 11 is subsequently formed and the remaining flange 2a is cut in a single tool.
  • the step edge pull ring 3 "consists of three rings which are concentric with one another, namely the inner pull ring 26, the step edge ring 27 and the counter holder 28.
  • the counter holder 28 is provided with an annular cutting edge.
  • the pull ring 26 is provided by the spring 30 and the step edge ring 27 supported by the spring 31.
  • the hold-down ring 10 ′′ surrounds an annular step edge stamp 32.
  • This step edge stamp 32 has an annular cutting edge 33.
  • the step edge stamp 32 surrounds the deep-drawing stamp 36, which has a shoulder 37. Otherwise, parts of the same function are designated by the same reference numerals as in the embodiment shown in FIG. 1.
  • a flat sheet metal disk of a suitable size is placed between the end faces of the drawing ring, step edge ring and counter-holder 28 on the one hand and hold-down device 10 "and step edge punch 32 on the other hand. Under the action of springs 34 and pressure pins 35, this disk is clamped between the end faces of the components mentioned.
  • the bowl with the initially flat flange is first formed in a stop pull (or further move) by the deep-drawing punch 36. As soon as the bowl has reached the desired height, the shoulder 37 comes to rest on the step edge punch 32. It now takes place 5 the forming of a part of the flange 2 to the step edge 11. The drawing ring deflects in the axial direction against the action of the spring 30.
  • step edge 11 is completely formed in this second phase, under the action of the two trimming edges 29 and 33 in a third phase trim the remaining flange 2a according to FIG. 4 on the right itten.
  • step rim ring 27 diverts in the axial direction against the action of the spring 31.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

A deep-drawn can with a stepped edge adjoining the top of the cylindrical can body is produced by first deep-drawing, in a first draw and, if appropriate, one or more further draws, a cup which has a plane flange and whose internal diameter and height correspond to the internal diameter and height of the can body of the finished deep-drawn can. Using a holding-down tool acting on the flange, a part of the flange is then deformed to give the stepped edge, while leaving a residual flange, by means of a stepped-edge drawing ring with a drawing orifice whose diameter approximately corresponds to the external diameter of the can body, and with a stepped-edge recess which is provided at the inlet end thereof and is formed with a diameter greater than that of the drawing orifice, and by means of a stepped-edge stamp with a stamp part corresponding to the internal diameter of the can body, and with a stepped-edge part of greater diameter.

Description

Die Erfindung betrifft ein Verfharen zur Herstellung einer Tiefziehdose aus Blech, mit einem oben an den zylindrischen Dosenrumpf anschließenden Stufenrand, mittels eines, gegebenenfalls mehrteiligen Stufenrandziehringes mit einer Ziehöffnung, deren Durchmesser etwa dem Außendurchmesser des Dosenrumpfes entspricht, und mit einer an seinem Einlaufende vorgesehenen, im Durchmesser größer als die Ziehöffnung ausgebildeten Stufenrandausnehmung, und mittels eines, gegebenenfalls mehrteiligen Stufenrandstempels mit einem dem Innendurchmesser des Dosenrumpfes entsprechenden Stempelteil und mit einem in Durchmesser größeren Stufenrandteil, wobei zunächst ein einen ebenen Flansch aufweisender Napf tiefgezogen wird, dessen Innendurchmesser und Höhe dem Innendurchmesser und der Höhe des Dosenrumpfes der fertigen Tiefziehdose entspricht, und dann mittels des Stufenrandteiles und der Stufenrandausnehmung unter Verwendung eines auf den Flansch einwirkenden Niederhalters ein Teil des Flansches unter Belassung eines Restflansches zu dem Stufenrand umgeformt wird.The invention relates to a method for producing a deep-drawn tin from sheet metal, with a step edge adjoining the cylindrical can body by means of an optionally multi-part step edge pulling ring with a pull opening, the diameter of which corresponds approximately to the outer diameter of the can body, and with a provided at its inlet end, in Diameter larger than the step opening formed step edge recess, and by means of an optionally multi-part step edge stamp with a stamp part corresponding to the inside diameter of the can body and with a step step part with a larger diameter, firstly a cup having a flat flange is deep-drawn, the inside diameter and height of the inside diameter and the Height of the can body of the finished deep-drawn can corresponds, and then by means of the step edge part and the step edge recess using a hold-down acting on the flange, a part of the flange below Leaving a remaining flange to the step edge is formed.

Tiefziehdosen aus Blech mit Stufenrand werden vorzugsweise dann eingesetzt, wenn als Verschluß ein Vollaufreißdeckel dient. Beim Abreißen des mit dem Deckelrand über eine Kerblinie verbundenen, radial inneren Deckelfeldes verbleibt der ringförmige, mit der Dose durch einen Falz verbundene Deckelrand an der Dose. Bei Tiefziehdosen ohne Stufenrand wäre dann der Öffnungsdurchmesser des Deckelrandes kleiner als der Innendurchmesser der Dose, was beim Entleeren insbesondere pastöser Füllgüter zu Schwierigkeiten führt. Bei Tiefziehdosen mit Stufenrand ist es möglich, den Öffnungsdurchmesser des Deckelrandes gleich oder größer dem Innendurchmesser des Dosenrumpfes zu machen.Thermoformed cans made of sheet metal with a step edge are preferably used when a full tear-open lid serves as a closure. When the radially inner cover field connected to the edge of the cover via a score line is torn off, the ring-shaped cover edge connected to the can by a fold remains on the can. In the case of deep-drawn cans without a step edge, the opening diameter of the lid edge would then be smaller than the inside diameter of the can, which leads to difficulties when emptying pasty filling goods in particular. In the case of deep-drawn cans with a step edge, it is possible to make the opening diameter of the lid edge equal to or larger than the inside diameter of the can body.

Die Herstellung von Tiefziehdosen aus Aluminiumblech mit Stufenrand erfolgt bei dem eingangs erwähnten bekannten Verfahren in einem Anschlagzug, wobei das Blech während des Tiefziehens des Dosenrumpfes frei über die Stufenrandausnehmung des Stufenrandziehringes läuft. Bei Verwendung von Stahlblech, insbesondere solchem mit kleiner Dicke und hoher Härte, z.B. von doppelt reduziertem Stahlblech, welches nach dem Rekristallisationsglühen mit einem hohen Nachwalzgrad von über 15% kalt nachgewalzt wurde, treten an der tiefgezogenen Dose Falten auf.The deep-drawn cans made of aluminum sheet with a step edge are produced in the above-mentioned known method in one stroke, the sheet running freely over the step edge recess of the step edge pulling ring during the deep-drawing of the can body. When using sheet steel, especially those with a small thickness and high hardness, e.g. Double-reduced steel sheet, which was cold-rolled after recrystallization annealing with a high degree of re-rolling of over 15%, wrinkles appear on the deep-drawn can.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Verfahren zur Herstellung einer Tiefziehdose aus Blech, mit einem oben an den zylindrischen Dosenrumpf anschließenden Stufenrand der eingangs erwähnten Art aufzuzeigen, mit welchem es möglich ist, derartige Tiefziehdosen aus blanken oder lackierten Stahlblechen, insbesondere solchen mit kleiner Dicke und größerer Härte, insbesondere aus doppelt reduziertem Stahlblech, faltenfrei herzustellen.The invention is therefore based on the object of demonstrating a method for producing a deep-drawn box made of sheet metal, with a step edge of the type mentioned at the top adjoining the cylindrical can body, with which it is possible to produce such deep-drawn boxes made of bare or painted steel sheets, in particular those with smaller dimensions Manufacture thickness and greater hardness, especially from double-reduced steel sheet, without wrinkles.

Dies wird nach der Erfindung dadurch erreicht, daß beim Tiefziehen von Dosen aus Stahlblech zunächst in einer Vorstufe unter Verwendung eines Ziehringes ohne Stufenrandausnehmung in einem Anschlagzug und gegebenenfalls einem oder mehreren Weiterzügen der Napf tiefgezogen wird und daß dann dieser vorgezogene Napf von dem Stufenrandziehring umgeben und in einer weiteren Stufe mittels des Stufenrandteiles und der Stufenrandausnehmung ein Teil des Flansches zu dem Stufenrand umgeformt wird.This is achieved according to the invention in that when deep-drawing cans made of sheet steel is first deep-drawn in a preliminary stage using a drawing ring without a step edge recess in a stop train and, if appropriate, one or more further moves of the bowl, and then this preferred bowl is surrounded by the step edge pulling ring and in a further step by means of the step edge part and the step edge recess a part of the flange is formed to the step edge.

Mit diesem Verfahren ist es möglich, Tiefziehdosen mit Stufenrand aus Stahlblech, insbesondere mit kleiner Dicke von etwa 0,17 mm und großer Härte von etwa 60 bis 70 HR30T, faltenfrei herzustellen.With this process it is possible to produce deep-drawn cans with stepped edges from sheet steel, in particular with a small thickness of approximately 0.17 mm and a high hardness of approximately 60 to 70 HR30T.

Bei Durchführung des Verfahrens kann der Napf in der Vorstufe zunächst in einem oder mehreren Tiefziehwerkzeugen vorgezogen werden. Dieser vorgezogene Napf wird dann in ein Werkzeug mit Stufenrandziehring gebracht und in diesem Werkzeug wird dann in einer weiteren Stufe ein Teil des Flansches in den Stuferand umgeformt. In dem Stufenrandziehring erfolgt also nur noch die Umformung eines Teiles des Flansches in den Stufenrand. Beide Stufen können jedoch auch in einem einzigen, mehrstufigen Werkzeug durchgeführt werden, wobei jedoch das gleiche Prinzip angewendet wird, in der Vorstufe wird zunächst der Napf, bestehend aus Dosenrumpf und Flansch, in einem Werkzeugteil (Ziehring), welches keinen Stufenrand aufweist, tiefgezogen. Während dieser Vorstufe ist ein zweites Werkzeugteil, welches die Stufenrandausnehmung enthält, durch das erste Werkzeugteil abgedeckt und damit unwirksam. Erst wenn die Napfherstellung in der Vorstufe abgeschlossen ist, wird das erste Werkzeugteil beispielsweise entgegen der Kraft einer Feder verschoben und hierbei die Stufenrandausnehmung des zweiten Werkzeugteiles freigegeben, wodurch dann in der weiteren Stufe das Umformen eines Teiles des Flansches zu dem Stufenrand erfolgen kann.When carrying out the method, the bowl in the preliminary stage can first be drawn out in one or more deep-drawing tools. This advanced cup is then brought into a tool with a step edge ring and in this tool a part of the flange is then formed into the step edge in a further step. In the step edge drawing ring, therefore, only part of the flange is deformed into the step edge. However, both stages can also be carried out in a single, multi-stage tool, however, the same principle is used, in the preliminary stage the bowl, consisting of the can body and flange, is deep-drawn in a tool part (drawing ring) that has no step edge. During this preliminary stage, a second tool part, which contains the step edge recess, is covered by the first tool part and is therefore ineffective. Only when the bowl production is completed in the preliminary stage is the first tool part displaced, for example, against the force of a spring and the step edge recess of the second tool part is released, as a result of which a part of the flange can then be formed into the step edge in the further step.

Vorteilhafte Weiterbildungen des Verfahrens sind in den Unteransprüchen gekennzeichnet.Advantageous further developments of the method are characterized in the subclaims.

Die Erfindung ist in folgendem, anhand von in der Zeichnung dargestellten Ausführungsbeispielen von Werkzeugen zur Durchführung des Verfahrens näher erläutert. Es zeigen:

  • Figur 1 eine erste Ausführungsform eines Werkzeuges im Axialschnitt, links in Ausgangsstellung, rechts in Endstellung,
  • Figur 2 ein zweites Ausführungsbeispiel eines Werkzeuges im Axialschnitt, links in Ausgangsstellung, rechts in Endstellung,
  • Figur 3 ein drittes Ausführungsbeispiel eines Werkzeuges im Axialschnitt, links in Ausgangsstellung, rechts in Endstellung,
  • Figur 4 ein viertes Ausführungsbeispiel eines Werkzeuges im Axialschnitt, links in einer Zwischenstellung beim Tiefziehen, rechts in Endstellung,
  • Figur 5 eine Zwischenstellung dieses Werkzeuges beim Umformen des Stufenrandes.
The invention is explained in more detail below on the basis of exemplary embodiments of tools for carrying out the method shown in the drawing. Show it:
  • 1 shows a first embodiment of a tool in axial section, left in the starting position, right in the end position,
  • FIG. 2 shows a second embodiment of a tool in axial section, left in the starting position, right in the end position,
  • FIG. 3 shows a third embodiment of a tool in axial section, left in the starting position, right in the end position,
  • FIG. 4 shows a fourth embodiment of a tool in axial section, left in an intermediate position during deep drawing, right in the end position,
  • Figure 5 shows an intermediate position of this tool when reshaping the step edge.

Bei der Durchführung des erfindungsgemäßen Verfahrens wird zunächst aus einer Stahlblechscheibe von kleiner Dicke s .von beispielsweise 0,17 mm und großer Härte von etwa 60 bis 70 HR30T in herkömmlicher Weise ein Napf N tiefgezogen, der anschließend an seinen Dosenrumpf 1 einen ebenen Flansch 2 aufweist. Die Herstellung dieses Napfes kann in einem Anschlagzug und gegebenenfalls einem oder mehreren Weiterzügen erfolgen. Der Innendurchmesser D des Napfes N und seine Höhe H soll dem Innendurchmesser D und der Höhe H der in Figur 1 rechts dargestellten Tiefziehdose T entsprechen. Der tiefgezogene Napf N wird anschließend mittels des in Figur 1 dargestellten Werkzeuges zu der fertigen Tief ziehdose T umgeformt. Dieses Werkzeug weist einen Stufenrandziehring 3 mit einer Ziehöffnung 4 auf, deren Durchmesser D1 unter Berücksichtigung eines ausreichenden Ziehspaltes etwa dem Außendurchmesser des Dosenrumpfes 1 entspricht. Am Einlaufende 3a des Stufenrandziehringes 3 ist ferner eine Stufenrandausnehmung 5 vorgesehen, deren Durchmesser D2 größer ist als der Durchmesser D1 der Ziehöffnung. Außerdem besteht das Werkzeug aus einem Stufenrandstempel 6 mit einem ersten Stempelteil 7, dessen Durchmesser D3 in etwa dem Innendurchmesser D des Dosenrumpfes 1 entspricht und mit einem in Durchmesser D4 größeren Stufenrandteil 8. Ferner weist das Werkzeug einen von einer verhältnismäßig schwachen Feder 9 belasteten Niederhalter 10 auf. Die Kraft der Feder 9 beträgt bei einem Dosendurchmesser D von 66 mm etwa 700 bis 800 N.When carrying out the method according to the invention, a cup N is first deep-drawn in a conventional manner from a sheet steel plate of small thickness s. Of, for example, 0.17 mm and high hardness of about 60 to 70 HR30T, which then has a flat flange 2 on its can body 1 . This bowl can be produced in one stop train and, if necessary, one or more further trains. The inside diameter D of the bowl N and its height H should correspond to the inside diameter D and the height H of the deep-drawing box T shown on the right in FIG. The deep-drawn bowl N is then formed into the finished deep-drawn box T by means of the tool shown in FIG. This tool has a step edge drawing ring 3 with a drawing opening 4, the diameter D1 of which, taking into account a sufficient drawing gap, corresponds approximately to the outside diameter of the can body 1. At the inlet end 3a of the step edge drawing ring 3 there is also a step edge recess 5, the diameter D2 of which is larger than the diameter D1 of the drawing opening. In addition, the tool consists of a step edge stamp 6 with a first stamp part 7, the diameter D3 of which corresponds approximately to the inside diameter D of the can body 1 and with a step edge part 8 which is larger in diameter D4. Furthermore, the tool has a hold-down device 10 loaded by a relatively weak spring 9 on. The force of the spring 9 is approximately 700 to 800 N with a can diameter D of 66 mm.

Der in einer Vorstufe gefertigte Napf N wird in den Stufenrandziehring 3 des beschriebenen Werkzeuges eingebracht, so wie es in Figur 1 links dargestellt ist. Hierbei ist der ebene Flansch 2 zwischen dem Stufenrandziehring 3 und dem Niederhalter 10 eingespannt. Mittels des Stufenrandstempels 6, der mit seinem Stempelteil 7 zuerst in den Dosenrumpf 1 des Napfes N eintritt, wird ein Teil des Flansches 2 unter Wirkung des Stufenrandteiles 8 durch Tiefziehen zu dem gewünschten Stufenrand 11 an der fertigen Tiefziehdose T umgeformt, wie es in Figur 1 rechts dargestellt ist. Bei diesem Umformvorgang wird am äußeren Ende des Stufenrandes 11 ein kleiner Restflansch 2a belassen, der unter Berücksichtigung einer Beschneidezugabe später zur Herstellung des Dosenbordes dient.The bowl N manufactured in a preliminary stage is introduced into the step edge drawing ring 3 of the tool described, as is shown on the left in FIG. 1. Here, the flat flange 2 is clamped between the step edge drawing ring 3 and the hold-down device 10. By means of the step edge stamp 6, which first enters the can body 1 of the bowl N with its stamp part 7, a part of the flange 2 is deformed under the effect of the step edge part 8 by deep drawing to the desired step edge 11 on the finished deep-drawing box T, as shown in FIG. 1 is shown on the right. In this shaping process, a small remaining flange 2a is left at the outer end of the step edge 11, which later takes into account the manufacture of the can board, taking into account a trimming allowance.

Wie man aus Figur 1 erkennen kann, wird beim Umformen des Stufenrandes der Dosenrumpf 1 in seinem Durchmesser D und auch in seiner Höhe H durch des Stempelteil 7 nicht ver ändert, da dieses Stempelteil 7 eine axiale Länge aufweist, die wesentlich kleiner ist als die Höhe H des Dosenrumpfes 1. In einem weiteren Werkzeug kann dann das Beschneiden des Restflansches 2a erfolgen, so daß ein ringförmiger Dosenbord entsteht, dessen radiale Breite an seinem ganzen Umfang gleich groß ist.As can be seen from Figure 1, the can body 1 is not changed in its diameter D and also in its height H by the stamp part 7 when the step edge is formed, since this stamp part 7 has an axial length which is substantially smaller than the height H of the can body 1. In a further tool, the remaining flange 2a can then be cut so that an annular can rim is formed, the radial width of which is the same across its entire circumference.

Die Stufenrand-Herstellung und das Beschneiden können jedoch gemäß Figur 2 oder 3 auch in einem Werkzeug erfolgen. Ein derartiges Werkzeug weist gemäß Figur 2 einen Stufenrandziehring 3' auf, der von einem durch eine Feder 12 abgestützten Gegenhalterring 13 konzentrisch umgeben ist. Der Niederhalterring 10' umschließt einen Druckring 14, auf welchen die Feder 9 einwirkt. An dem dem Niederhalterring 10' zugekehrten Ende des Stufenrandziehringes 3' ist ferner eine ringförmige Beschneidkante 15 vorgesehen, die mit einer ringförmigen Beschneidkante 16 am Niederhalterring 10' zusammenwirkt. Im übrigen sind der Stufenrandziehring 3' und auch der Stufenrandstempel 6 in gleicher Weise ausgebildet wie der Stufenrandziehring 3 und der Stufenrandstempel 6 bei dem in Figur 1 dargestellten Ausführungsbeispiel, weshalb für Teile gleicher Funktion die gleichen Bezugszeichen verwendet worden sind und obige' Beschreibung sinngemäß zutrifft.The step edge production and trimming can, however, also take place in one tool according to FIG. 2 or 3. Such a tool has, according to FIG. 2, a step edge pulling ring 3 'which is surrounded concentrically by a counter-holding ring 13 supported by a spring 12. The hold-down ring 10 'encloses a pressure ring 14, on which the spring 9 acts. At the end of the step edge pulling ring 3 'facing the hold-down ring 10' there is also an annular cutting edge 15 which interacts with an annular cutting edge 16 on the hold-down ring 10 '. Incidentally, the stepped rim drawing ring 3 are 'and the stages edge punches 6 formed in the same manner as the step edge draw ring 3 and the step edge punch 6 in the illustrated in Figure 1 embodiment, so for parts with the same function the same reference numerals have been used and the above' description applies mutatis mutandis.

Bei dem in Figur 2 dargestellten Ausführungsbeispiel wird der Flansch 2 des Napfes zwischen den Stirnflächen von Stufenrandziehring 3', Gegenhalter 13, Niederhalter 10' und Druckring 14 leicht federnd eingespannt. Es erfolgt dann durch den Stufenrandstempel 6 die umformung eines Teiles des Flansches 2 in den Stufenrand 11. An die Stufenrandformung schließt sich unmittelbar eine letzte Phase an, in welcher ein mit dem Stufenrandstempel 6 verbundener Flansch 17 unmittelbar auf den Niederhalter 10' drückt, wie es in Figur 2 rechts dargestellt ist. Hierdurch erfolgt unter Zusammenwirken der beiden Schneidkanten 15, 16 das Beschneiden des Restflansches 2a, wobei der Gegenhalter 13 entgegen der Kraft der Feder 12 ausweicht.In the exemplary embodiment shown in FIG. 2, the flange 2 of the cup is clamped in a slightly resilient manner between the end faces of the step edge pull ring 3 ', counter holder 13, hold-down device 10' and pressure ring 14. The step edge stamp 6 then forms part of the flange 2 into the step edge 11. The step edge forming is immediately followed by a last phase in which a flange 17 connected to the step edge stamp 6 presses directly on the hold-down device 10 ', as is the case is shown on the right in FIG. As a result, the remaining flange 2a is trimmed under the interaction of the two cutting edges 15, 16, the counter-holder 13 evading against the force of the spring 12.

Bei dem in Figur 3 dargestellten Ausführungsbeispiel ist der Stufenrandziehring 3" ebenfalls von einem Gegenhalter 18 konzentrisch umgeben, wobei in diesem Fall an dem Gegenhalter 18 eine ringförmige Beschneidkante 19 angeordnet ist. Der Stufenrandziehring 3" ist durch eine Feder 20 abgestützt. In dem Niederhalterring 10" ist ein konzentrischer Beschneidring 21 mit einer ringförmigen Schneidkante 22 vorgesehen. Auf den Niederhalterring 10" und den Beschneidring 21 wirken zunächst die durch die Federn 23 belasteten Druckstifte 24 ein, wodurch der Flansch 2 des Napfes N zwischen den Stirnflächen von Stufenrandziehring 3", Gegenhalter 18, Niederhalter 10" und Beschneidring 21 unter Wirkung der Federn 23 eingespannt wird. Im übrigen sind auch hier wieder Teile gleicher Funktion mit den gleichen Bezugszeichen bezeichnet wie in Figur 1. Nachdem das Umformen des Stufenrandes 11 beendet ist, schließt sich unmittelbar das Beschneiden des Restflansches 2a an. Dieses erfolgt unter Zusammenwirken der Beschneidkanten 19, 22, wenn der Beschneidring 21 an dem Absatz 25 des Stufenrandstempels zur Anlage gekommen ist. Beim Beschneiden des Restflansches 2a weicht der Stufenrandziehring 3" entgegen der Kraft der Feder 20 in axialer Richtung aus.In the embodiment shown in FIG. 3, the step edge pull ring 3 " likewise surrounded concentrically by a counter-holder 18, in which case an annular cutting edge 19 is arranged on the counter-holder 18. The step edge pulling ring 3 "is supported by a spring 20. In the hold-down ring 10", a concentric cutting ring 21 with an annular cutting edge 22 is provided. The hold-down ring 10 "and the trimming ring 21 are initially acted upon by the pressure pins 24 loaded by the springs 23, as a result of which the flange 2 of the cup N between the end faces of the step edge pull ring 3", counter-holder 18, hold-down device 10 "and trimming ring 21 under the action of the springs 23 For the rest, parts of the same function are again identified with the same reference numerals as in FIG. 1. After the shaping of the step edge 11 has ended, the remaining flange 2a is trimmed immediately, this taking place under the cooperation of the trimming edges 19, 22 when the cutting ring 21 has come to rest on the shoulder 25 of the step edge stamp. When the remaining flange 2a is cut, the step edge pull ring 3 "deflects in the axial direction against the force of the spring 20.

Bei dem in Figur 4 und 5 dargestellten Werkzeug erfolgt die Herstellung des Napfes N, das anschließende Umformen des Stufenrandes 11 und des Beschneiden des Restflanches 2a in einem einzigen Werkzeug. Der Stufenrandziehring 3" besteht in diesem Fall aus drei zueinander konzentrischen Ringen, nämlich dem inneren Ziehring 26, dem Stufenrandring 27 und dem Gegenhalter 28. Der Gegenhalter 28 ist mit einer ringförmigen Geschneidkante versehen. Der Ziehring 26 ist durch die Feder 30 und der Stufenrandring 27 durch die Feder 31 abgestützt. Der Niederhalterring 10" umgibt einen ringförmigen Stufenrandstempel 32. Dieser Stufenrandstempel 32 weist eine ringförmige Beschneidkante 33 auf. Der Stufenrandstempel 32 umgibt den Tiefziehstempel 36, der einen Absatz 37 aufweist. Im übrigen sind Teile gleicher Funktion mit den gleichen Bezugszeichen bezeichnet wie bei dem in Figur 1 dargestellten Ausführungsbeispiel.In the tool shown in FIGS. 4 and 5, the bowl N is produced, the step edge 11 is subsequently formed and the remaining flange 2a is cut in a single tool. In this case, the step edge pull ring 3 "consists of three rings which are concentric with one another, namely the inner pull ring 26, the step edge ring 27 and the counter holder 28. The counter holder 28 is provided with an annular cutting edge. The pull ring 26 is provided by the spring 30 and the step edge ring 27 supported by the spring 31. The hold-down ring 10 ″ surrounds an annular step edge stamp 32. This step edge stamp 32 has an annular cutting edge 33. The step edge stamp 32 surrounds the deep-drawing stamp 36, which has a shoulder 37. Otherwise, parts of the same function are designated by the same reference numerals as in the embodiment shown in FIG. 1.

Eine ebene Blechscheibe geeigneter Größe wird zwischen die Stirnflächen von Ziehring, Stufenrandring und Gegenhalter 28 einerseits sowie Niederhalter 10" und Stufenrandstempel 32 andererseits gebracht. Unter Wirkung der Federn 34 und der Druckstifte 35 ist diese Scheibe zwischen den Stirnflächen der genannten Bauteile eingespannt. Gemäß Figur 4 links wird zunächst in einem Anschlagzug (oder Weiterzug) durch den Tiefziehstempel 36 in einer ersten Phase der Napf mit dem zunächst ebenen Flansch geformt. Sobald der Napf die gewünschte Höhe erreicht hat, kommt der Absatz 37 an dem Stufenrandstempel 32 zur Anlage. Es erfolgt jetzt gemäß Figur 5 das Umformen eines Teiles des Flansches 2 zu dem Stufenrand 11. Hierbei weicht der Ziehring entgegen der Wirkung der Feder 30 in axialer Richtung aus. Sobald in dieser zweiten Phase der Stufenrand 11 vollständig ausgeformt ist, wird unter Wirkung der beiden Beschneidkanten 29 und 33 in einer dritten Phase der Restflansch 2a gemäß Figur 4 rechts beschnitten. Hierbei weicht der Stufenrandring 27 entgegen der Wirkung der Feder 31 in axialer Richtung aus.A flat sheet metal disk of a suitable size is placed between the end faces of the drawing ring, step edge ring and counter-holder 28 on the one hand and hold-down device 10 "and step edge punch 32 on the other hand. Under the action of springs 34 and pressure pins 35, this disk is clamped between the end faces of the components mentioned. According to FIG. 4 on the left, the bowl with the initially flat flange is first formed in a stop pull (or further move) by the deep-drawing punch 36. As soon as the bowl has reached the desired height, the shoulder 37 comes to rest on the step edge punch 32. It now takes place 5 the forming of a part of the flange 2 to the step edge 11. The drawing ring deflects in the axial direction against the action of the spring 30. As soon as the step edge 11 is completely formed in this second phase, under the action of the two trimming edges 29 and 33 in a third phase trim the remaining flange 2a according to FIG. 4 on the right itten. Here, the step rim ring 27 diverts in the axial direction against the action of the spring 31.

Claims (4)

1. Verfahren zur Herstellung einer Tiefziehdose aus Blech, mit einem oben an den zylindrischen Dosenrumpf anschliessenden Stufenrand, mittels eines, gegebenenfalls mehrteiligen Stufenrandziehringes mit einer Ziehöffnung, deren Durchmesser etwa dem Außendurchmesser des Dosenrumpfes entspricht, und mit einer an seinem Einlaufende vorgesehenen, im Durchmesser größer als die Ziehöffnung ausgebildeten Stufenrandausnehmung, und mittels eines, gegebenenfalls mehrteiligen Stufenrandstempels mit einem dem Innendurchmesser des Dosenrumpfes entsprechenden Stempelteil und mit einem im Durchmesser größeren Stufenrandteil, wobei zunächst ein einen ebenen Flansch aufweisender Napf tiefgezogen wird, dessen Innendurchmesser und Höhe dem Innendurchmesser und der Höhe des Dosenrumpfes der fertigen Tiefziehdose entspricht, und dann mittels des Stufenrandteiles und der Stufenrandausnehmung unter Verwendung eines auf den Flansch einwirkenden Niederhalters ein Teil des Flansches unter Belassung eines Restflansches zu dem Stufenrand umgeformt wird, dadurch gekennzeichnet, daß beim Tiefziehen von Dosen aus Stahlblech zunächst in einer Vorstufe unter Verwendung eines Ziehringes ohne Stufenrandausnehmung in einem Anschlagzug und gegebenenfalls einem oder mehreren Weiterzügen der Napf tiefgezogen wird und daß dann dieser vorgezogene Napf von dem Stufenrandziehring umgeben und in einer weiteren Stufe mittels des Stufenrandteiles und der Stufenrandausnehmung ein Teil des Flansches zu dem Stufenrand umgeformt wird.1. A method for producing a deep-drawn tin made of sheet metal, with a step edge adjoining the cylindrical can body by means of an optionally multi-part step edge pulling ring with a pulling opening, the diameter of which corresponds approximately to the outer diameter of the can body, and with a larger diameter provided at its inlet end as the step opening formed step edge recess, and by means of a possibly multi-part step edge stamp with a stamp part corresponding to the inside diameter of the can body and with a step step part with a larger diameter, firstly a cup having a flat flange is deep-drawn, the inside diameter and height of the inside diameter and the height of the Can body corresponds to the finished thermoformed can, and then by means of the step edge part and the step edge recess using a holding-down device acting on the flange, part of the flange while leaving a residual fla nsches is formed into the step edge, characterized in that when deep-drawing cans made of sheet steel, the cup is first deep-drawn in a preliminary stage using a drawing ring without a step edge recess in a stop pull and possibly one or more moves, and then this advanced cup is surrounded by the step edge pulling ring and in a further step, a part of the flange is formed into the step edge by means of the step edge part and the step edge recess. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Restflansch anschließend kreisförmig beschnitten wird.2. The method according to claim 1, characterized in that the remaining flange is then cut in a circle. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Herstellung des Napfes und das anschließende Umformen des Stufenrandes in einem einzigen Werkzeug erfolgt.3. The method according to claim 1 or 2, characterized in that the production of the bowl and the subsequent shaping of the step edge takes place in a single tool. 4. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß das Beschneiden des Restflansches in einer unmittelbar an die Stufenrandformung anschließenden letzten Phase durch am Stufenrandziehring und an dem Niederhalter bzw. dem Stufenrandstempel vorgesehene ringförmige Beschneidwerkzeuge erfolgt.4. The method according to claim 1, 2 or 3, characterized in that the trimming of the remaining flange in a directly to the Stu subsequent edge phase shaping is carried out by annular trimming tools provided on the step edge drawing ring and on the hold-down device or the step edge stamp.
EP88101419A 1987-02-17 1988-02-02 Method of making a drawn can of sheet metal Expired - Lifetime EP0279269B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101419T ATE75975T1 (en) 1987-02-17 1988-02-02 PROCESS FOR THE MANUFACTURE OF A METAL SHEET METAL DEEP-DRAWING CAN.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3704895 1987-02-17
DE19873704895 DE3704895A1 (en) 1987-02-17 1987-02-17 METHOD FOR PRODUCING A DRAWING TANK FROM SHEET METAL

Publications (3)

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EP0279269A2 true EP0279269A2 (en) 1988-08-24
EP0279269A3 EP0279269A3 (en) 1990-05-09
EP0279269B1 EP0279269B1 (en) 1992-05-13

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EP88101419A Expired - Lifetime EP0279269B1 (en) 1987-02-17 1988-02-02 Method of making a drawn can of sheet metal

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EP (1) EP0279269B1 (en)
AT (1) ATE75975T1 (en)
DE (2) DE3704895A1 (en)
ES (1) ES2031935T3 (en)
GR (1) GR3005012T3 (en)

Cited By (3)

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EP0614711A1 (en) * 1993-03-09 1994-09-14 Sollac Process and device for drawing metallic blanks for the manufacture of so-called deep drawn pieces
US5442111A (en) * 1991-05-24 1995-08-15 Warner-Lambert Company 3,5-di-tetriary-4-butyl-4-hydroxyphenyloxy- or tioalkylene N-hydroxyamides, N-hydroxythioamides, N-hydroxyureas, and N-hydroxythioureas as 5-lipoxygenase inhibitors
WO2005023451A1 (en) * 2003-09-04 2005-03-17 Maiko Engineering Gmbh Method for producing a cup-shaped object

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007054825A1 (en) * 2007-11-16 2009-05-20 Audi Ag Tool for trimming and cutting flat workpieces as well as cutting and depositing methods
DE102011053084B4 (en) * 2011-08-29 2013-07-11 Schuler Pressen Gmbh Apparatus and method for producing can bodies with cutting device
DE102017117238B4 (en) * 2017-07-31 2022-02-17 Aweba Werkzeugbau Gmbh Aue Transfer tool for multi-row blank processing

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Publication number Priority date Publication date Assignee Title
US5442111A (en) * 1991-05-24 1995-08-15 Warner-Lambert Company 3,5-di-tetriary-4-butyl-4-hydroxyphenyloxy- or tioalkylene N-hydroxyamides, N-hydroxythioamides, N-hydroxyureas, and N-hydroxythioureas as 5-lipoxygenase inhibitors
EP0614711A1 (en) * 1993-03-09 1994-09-14 Sollac Process and device for drawing metallic blanks for the manufacture of so-called deep drawn pieces
FR2702401A1 (en) * 1993-03-09 1994-09-16 Lorraine Laminage Method and device for stamping metal blanks for producing so-called deep-drawn parts.
WO2005023451A1 (en) * 2003-09-04 2005-03-17 Maiko Engineering Gmbh Method for producing a cup-shaped object
US7661286B2 (en) 2003-09-04 2010-02-16 Maiko Engineering Gmbh Method for producing a cup-shaped object

Also Published As

Publication number Publication date
DE3870907D1 (en) 1992-06-17
ATE75975T1 (en) 1992-05-15
DE3704895C2 (en) 1988-11-17
EP0279269A3 (en) 1990-05-09
GR3005012T3 (en) 1993-05-24
EP0279269B1 (en) 1992-05-13
DE3704895A1 (en) 1988-08-25
ES2031935T3 (en) 1993-01-01

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