EP0510291A1 - Method of and device for manufacture of threaded cans made of aluminium - Google Patents

Method of and device for manufacture of threaded cans made of aluminium Download PDF

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Publication number
EP0510291A1
EP0510291A1 EP91810599A EP91810599A EP0510291A1 EP 0510291 A1 EP0510291 A1 EP 0510291A1 EP 91810599 A EP91810599 A EP 91810599A EP 91810599 A EP91810599 A EP 91810599A EP 0510291 A1 EP0510291 A1 EP 0510291A1
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EP
European Patent Office
Prior art keywords
thread
neck
template
rolling
roll
Prior art date
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Granted
Application number
EP91810599A
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German (de)
French (fr)
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EP0510291B2 (en
EP0510291B1 (en
Inventor
Thomas Eugen Nussbaum-Pogacnik
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NUSSBAUM & GUHL AG
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Nussbaum & Guhl AG
E Nussbaum AG
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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
    • B21D51/38—Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures
    • 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
    • B21D51/24—Making hollow objects characterised by the use of the objects high-pressure containers, e.g. boilers, bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/04—Making by means of profiled-rolls or die rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B65D1/023—Neck construction
    • B65D1/0246—Closure retaining means, e.g. beads, screw-threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations

Definitions

  • the invention relates to a method and a device according to the corresponding, independent patent claims for the production of aluminum cans with threads, in particular of deep-drawn, deep-drawn and drawn or extruded, aluminum cans with bottle thread lacquered inside and outside. Furthermore, the invention relates to a painted, threaded aluminum can according to the corresponding independent claim.
  • lacquers For the processes for the production of lacquered aluminum cans according to the prior art, lacquers have been developed which are so adhesive, elastic and slippery that cylindrical, lacquered aluminum cans can be drawn in bottle-shaped without the lacquer being damaged.
  • containers could be made from aluminum, onto which, for example, a hand pump with a riser pipe or a screw cap could be screwed, like on plastic or glass bottles.
  • the aluminum container could be filled and closed with the screw cap. The consumer could simply screw the pump, which would be designed for multiple use, onto the aluminum container and unscrew it again, and recycle or refill the container without foreign material.
  • aluminum cans with appropriate threads, advantageously standardized threads, would be necessary.
  • the cans should not have to be cleaned after the thread has been attached, that is to say that process and device must do without the addition of lubricant or that a lubricant is used which does not impair the can contents or the appearance of the can.
  • the thread is produced by a tool that rolls on the outside of the neck and a quasi-stationary tool on the inside of the neck that supports the can material from the inside.
  • the two tools operate in a force-controlled manner so that there is slippage between the neck and the tool. This largely prevents the neck material from building up in front of the tools and shifting in the direction of movement of the tools, which would lead to oval threads and would stress and damage the paint to a great extent.
  • Figure 1 shows the basic method steps of the inventive method.
  • the process is shown as a process block diagram and below it schematically the changes in shape of the can produced by the individual process steps, namely as a top view and as a longitudinal section through the neck part of the can.
  • Flat, usually round pieces of a deep-drawable or extrudable aluminum alloy are made in a known manner by deep drawing Deep drawing and additional stretching or cylindrical cans produced by extrusion.
  • the wall thickness of the can should measure a maximum of 20% of the pitch of the thread provided for the can.
  • the cans are cleaned to remove the lubricant required for pulling.
  • a first step of method A (painting) according to the invention they are painted on the inside and outside and possibly printed, as long as they have a cylindrical shape.
  • the paints used are, for example, polyester or epoxy phenol paints.
  • plasticizers, catalysts and lubricants are mixed with one or more additives known to the person skilled in the art as plasticizers, catalysts and lubricants.
  • the devices used for painting correspond to known devices of this type, with which the inner paint is applied by spraying and the outer paint is applied with a corresponding roller. After painting, the paints are dried and polymerized accordingly.
  • the cans are clamped onto a turntable, by means of which they are gradually rotated into the area of successive tools which are mounted on a tool plate.
  • a corresponding device is described, for example, in Swiss Patent 394'998 / 65 (Lechner) and is assumed to be known.
  • each can is drawn in in stages, the two process steps, depending on the diameter of the can, the desired can shape and the material, consisting of different numbers of effective drawing-in steps with different tools can.
  • B When B is first drawn in, the can has a narrowing shoulder and an essentially cylindrical first neck piece 10, and when second C is drawn in, a second, narrower, essentially cylindrical neck piece 20 is connected to first neck piece 10.
  • the outside diameter d 1 of the first neck piece 10 corresponds essentially to the outside diameter of the thread to be created, the outside diameter d 2 of the second narrower neck piece 20 is slightly smaller than the core diameter d 3 of the thread to be created.
  • a thread 30 is rolled up on the first neck piece 10 or on the part of the first neck piece 10 facing the second neck piece 20.
  • the thread is produced by a thread roll rolling around the outer circumference of the first neck piece 10, which is pressed against a quasi-stationary thread template in the interior of the neck. The thread is thus pressed from the outside of the neck towards the inside, so that the outside diameter of the finished rolled thread corresponds to the original neck diameter d 1.
  • Its core diameter d3 is a little larger than the outer diameter d2 of the second neck piece 20th
  • the thread runs against the second neck piece 20, that is, it does not extend to the edge of the neck. This prevents the neck edge from being deformed from its exactly circular cylindrical shape by the thread rolling.
  • the can neck is cut to length, for example directly above the upper outlet of the thread. If the box is to be used in connection with a hand pump, the connection between the neck edge and the pump connection must be tight. Depending on the type of seal used, it can be advantageous to design the end face of the can neck to be straight or slightly crooked. Methods and devices for cutting can necks to length are known and therefore need not be described here.
  • process steps B, C, D and E In order to ensure continuous, fast and economical production, it is necessary to carry out process steps B, C, D and E with the same clamping of the can. However, this also means that the process steps must be subordinated to a basic cycle, which is provided by a corresponding production machine. If the thread is to be rolled in such a cycle, at a production speed of between 100 and 200 cans per minute, which is common today, this means that a cycle time of between 0.6 and 0.3 seconds is available for the thread rolling in which the can moved to the appropriate place, the tools are brought into the working position and the thread is rolled.
  • a working time of between 0.035 and 0.07 sec is available for the effective process of thread rolling.
  • Figures 2a and b now show a top view in detail of the method and the tools used to roll the thread.
  • Figure 2a shows the tools before the thread rolling process, Figure 2b during the thread rolling process.
  • annular end face 21 of the second neck piece 20 with the outside diameter d 2 and the first neck piece 10 with the outside diameter d 1 is shown.
  • an essentially cylindrical or slightly frustoconical thread template 40 is inserted into the can neck.
  • the largest diameter of the template is such that it can be inserted through the second neck piece 20 without difficulty.
  • the template On its side surface, the template carries a slightly distorted, negative image 41 of the thread to be rolled, which is indicated by dashed lines in this top view.
  • the can neck and the template are arranged coaxially, that is, their axes of rotation S and T coincide.
  • a threaded roller 50 is positioned outside the can neck, which is designed with a thread shape (designed as a spiral 51 around the roller) that it can be used without moving axially Thread can roll.
  • the thread roll is spaced from the neck in such a way that it does not touch it.
  • the template 40 and the thread roller 50 are moved against one another by shifting their axes T and U such that the template 40, where the thread roller 50 is positioned on the outside, touches the inner surface of the first neck piece and the thread shape 51 of the thread roller 50 by the thread depth of the thread to be rolled is pressed into the neck material.
  • the thread roll 50 is unwound on the neck and thus coordinates the axis of rotation of the template rotated about the axis of rotation of the can such that the template always rests against the neck and supports the neck material where the thread roll is currently rolling.
  • the template 40 and thread roll 50 are brought back into the position described for the insertion (FIG. 2a) and removed in the axial direction from the can.
  • the thread roll 50 When the thread rolls, the thread roll 50 is unrolled in a positively controlled manner in such a way that the circumferential distance rolled on the roll is greater than the circumferential distance rolled on the neck. This creates a slip between the thread roll and the neck, so that the thread roll rolls over the neck circumference in one direction, but always slips on the surface of the neck in the opposite direction. This slip, which creates a force against the direction of movement of the threaded roller 50 on the neck material, prevents the roller from jamming the neck material in front of it and shifting it in the unwinding direction.
  • FIGS. 3a and 3b show, corresponding to FIGS . 2a and 2b, the tools used for the thread rolling process before (FIG. 3a) and during (FIG. 3b) the thread rolling process, specifically as a section along the axis of rotation of the can, only one side of the can neck is shown.
  • the threads 41 of the thread template need only correspond to the shape of the finished thread in depth and pitch, but should not have any sharp edges where they come into contact with the deformed inner surface.
  • the thread shape 51 of the thread roll 50 must correspond in shape to the shape of the thread to be created.
  • the thread template 40 is advantageously designed in such a way that it not only supports the inner surface of the first neck piece 10, but also at least partially the inner surface of the second neck piece 20, although no thread is rolled thereon.
  • FIG. 4 schematically shows the parts of a device for thread rolling on cans relevant to the invention in an exemplary embodiment.
  • the figure is a section along the axis of rotation S of the can.
  • the two neck pieces 10 and 20 are visible from the can.
  • the thread template 40 and the thread roller 50 are in a position which corresponds to their position in FIGS. 2b and 3b.
  • the axis T of the template 40 does not lie on the axis of rotation S of the can, the thread roller 50 presses into the neck material.
  • the means 60 are shown, with the aid of which the slip between the thread roll 50 and the can neck is generated. It is a ring gear 61 that is attached to the shaft 42 of the template 40, and a second ring gear 62 running in this ring gear 61 that is attached to the thread roller 50. If the axis U of the thread roll 50 is now moved about the axis T of the template 40, the thread roll rolls on the can neck in a force-controlled manner by the toothed drive 60. Since the rolling radius r of the thread roll 50 on the can neck is smaller than the rolling radius R of the ring gear 61, a slip occurs between the thread roll 50 and the can neck in such a way that the thread roll 50 slides on the neck material against its direction of travel.
  • the clocked movement of the tool plate is advantageously used for the axial movement , on which the tools for the other process steps are also mounted.
  • the circular movement of the thread roll is driven, for example, with a belt drive.
  • the coupling of the movement of the thread roll 50 and the axis T of the template 40 and the control of the relative movement of the two axes T and U before and after the effective thread rolling process can be realized by corresponding asymmetrical wedge arrangements, the relative movement of the two axes by a relative Movement in the axial direction of these wedge arrangements is realized.
  • the movement of the axis T around the axis S can be realized in such a way that the axis T describes a cylinder jacket around the axis S, or that the axis T describes a cone about the axis S.
  • the template 40 In the case of the cylinder movement, the template 40 must be cylindrical, in the case of the cone movement, the template 40 must be configured in the form of a truncated cone, with the tapered end pointing into the can.
  • FIG. 5 shows a can closed with a hand pump 70, to which a thread was attached using the method according to the invention.
  • the thread can correspond to any standard for such threads, for example the Euronorm. It can be seen that threads which are produced by the method according to the invention have an accuracy of approximately ⁇ 0.1 mm, an accuracy which far exceeds the accuracy of corresponding plastic or glass threads. For this reason, it is also not necessary, as shown in FIG. 5, to improve the centering of the screwed-on pump by a corresponding puncture at the end of the can neck facing the shoulder.
  • the shape of the can bottom is not relevant for the method according to the invention.
  • the can shown has, for example, an inwardly curved base.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

Deep-drawn, deep-drawn and stretched or extruded, cylindrical aluminium cans are coated inside and outside, provided with a two-stage neck (10, 20) by drawing-in, onto which neck a thread (30) is rolled, and then cut to length, the drawing-in of the neck, the thread-rolling and the cutting-to-length being carried out in the same clamping operation on the can. The coating used is mixed with a catalyst, plasticiser and/or lubricant to increase its flexibility, to increase its adhesiveness and to improve its sliding properties. The thread is rolled by the can neck being supported from inside by a virtually stationary thread template (40) while a thread roller (50) is rolled over the surface of the neck from outside, the said roller pressing the thread inwards into the neck. Thread template and thread roller are positively controlled in such a way that a slipping is produced between them and the material of the neck. As a result, the coating remains intact even in the region of the thread.

Description

Die Erfindung bezieht sich auf ein Verfahren und eine Vorrichtung gemäss den entsprechenden, unabhängigen Patentansprüchen zur Herstellung von Aluminiumdosen mit Gewinden, insbesondere von tiefgezogenen, tiefgezogenen und abgestreckten oder fliessgepressten, innen und aussen lackierten Aluminiumdosen mit Flaschengewinde. Ferner bezieht sich die Erfindung auf eine lackierte, mit einem Gewinde versehene Aluminiumdose gemäss dem entsprechenden, unabhängigen Patentanspruch.The invention relates to a method and a device according to the corresponding, independent patent claims for the production of aluminum cans with threads, in particular of deep-drawn, deep-drawn and drawn or extruded, aluminum cans with bottle thread lacquered inside and outside. Furthermore, the invention relates to a painted, threaded aluminum can according to the corresponding independent claim.

Es entspricht dem Stande der Technik flache, runde Aluminiumstücke durch Ziehen zu zylinderförmigen Dosen zu formen, diese innen und aussen zu lackieren und dann durch Einziehen und Bördeln die Dosenöffnung zu verengen und für den Aufsatz eines Verschlusses fertig zu machen. Derartige Dosen werden beispielsweise zu Aerosol-Monoblockdosen weiterverarbeitet. Das Lackieren und vor allem das Aufdrucken von Schriftzügen oder Dekorationsmustern vor dem Einziehen ist deshalb vorteilhaft, weil nur an zylindrischen Dosen die Lacke aufgerollt werden können. Auch innen, wo der Lack zwar aufgespritzt wird, ist dies einfacher an der noch zylindrischen Dose.It corresponds to the state of the art to form flat, round aluminum pieces by pulling them into cylindrical cans, to paint them inside and outside and then to narrow the can opening by pulling in and flanging them and to prepare them for the attachment of a closure. Such cans are further processed, for example, into aerosol monoblock cans. The painting and especially the printing of lettering or decorative patterns before drawing in is advantageous because the paints can only be rolled up on cylindrical cans. Even where the paint is sprayed on, this is easier with the still cylindrical can.

Das Lackieren der Innenseite von Aluminiumbehältern ist notwendig, für alle diejenigen Anwendungen, in denen eine blanke Aluminiumoberfläche vom Inhalt der Dose angegriffen würde. Überall dort, wo während Gebrauch und Lagerung der Doseninhalt mit der Innenoberfläche der Dose in Kontakt kommt, ist es in derartigen Fällen wichtig, dass der Innenlack die Aluminiumoberfläche absolut unterbruchslos abdeckt.Painting the inside of aluminum containers is necessary for all those applications in which a bare aluminum surface would be attacked by the contents of the can. Wherever the contents of the can come into contact with the inner surface of the can during use and storage, it is important in such cases that the inner paint completely covers the aluminum surface without interruption.

Für die Verfahren zur Herstellung von lackierten Aluminiumdosen gemäss dem Stande der Technik sind Lacke entwickelt worden, die derart haftfähig, elastisch und gleitfähig sind, dass sich zylindrische, lackierte Aluminiumdosen flaschenförmig einziehen lassen, ohne dass der Lack Schaden nimmt.For the processes for the production of lacquered aluminum cans according to the prior art, lacquers have been developed which are so adhesive, elastic and slippery that cylindrical, lacquered aluminum cans can be drawn in bottle-shaped without the lacquer being damaged.

Da Aluminium ein gut und billig recyclebares Verpackungsmaterial ist, wäre es sinnvoll und wünschenswert, wenn aus Aluminium Behälter hergestellt werden könnten, auf die wie auf Kunststoff- oder Glasflaschen beispielsweise eine Handpumpe mit einem Steigrohr oder ein Schraubdeckel aufgeschraubt werden könnte. Der Aluminiumbehälter könnte beispielsweise gefüllt und mit dem Schraubdeckel geschlossen in den Handel kommen. Der Konsument könnte die Pumpe, die für Mehrfachgebrauch ausgelegt wäre, einfach auf den Aluminiumbehälter auf- und wieder abschrauben und den Behälter ohne Fremdmaterial dem Recycling zuführen oder wieder befüllen. Zu diesem Zwecke wären Aluminiumdosen mit entsprechenden Gewinden, vorteilhafterweise normierten Gewinden notwendig.Since aluminum is a good and cheap recyclable packaging material, it would make sense and be desirable if containers could be made from aluminum, onto which, for example, a hand pump with a riser pipe or a screw cap could be screwed, like on plastic or glass bottles. For example, the aluminum container could be filled and closed with the screw cap. The consumer could simply screw the pump, which would be designed for multiple use, onto the aluminum container and unscrew it again, and recycle or refill the container without foreign material. For this purpose, aluminum cans with appropriate threads, advantageously standardized threads, would be necessary.

Es stellt sich also die Aufgabe, ein Verfahren aufzuzeigen und eine Vorrichtung zu schaffen, mit denen an Aluminiumdosen, insbesondere an innen und aussen lackierten Aluminiumdosen Gewinde, insbesondere normierte Gewinde, angebracht werden können. Es ist dabei besonders wichtig, dass der Lack, vor allem der innere Lack durch das Anbringen des Gewindes nicht verletzt wird, denn in der oben beschriebenen Aufgabe einer derartigen Dose wird das Gewinde innen in Berührung stehen mit dem Doseninhalt. Verfahren und Vorrichtung sollen in bekannten Herstellungslinien für die Herstellung von tiefgezogenen, tiefgezogenen und abgestreckten oder fliessgepressten, lackierten Aluminiumdosen integrierbar sein, das heisst das Gewinde muss hergestellt werden können in derselben Aufspannung, in der die anderen Arbeitsschritte wie Einziehen des Halses, Ablängen der Dose etc. durchgeführt werden, und zwar in einer Zykluszeit von ca. 0,3 bis 0,6 sec und einer effektiven Bearbeitungszeit von 0,035 bis 0,07 sec. Die Dosen sollen nach dem Anbringen des Gewindes nicht gereinigt werden müssen, das heisst, dass Verfahren und Vorrichtung ohne Zufügen von Schmiermittel auskommen müssen oder dass ein Schmiermittel verwendet wird, das weder den Doseninhalt noch die Erscheinung der Dose beeinträchtigt.It is therefore the task of demonstrating a method and creating a device with which threads, in particular standardized threads, can be attached to aluminum cans, in particular to aluminum cans painted inside and out. It is particularly important that the paint, especially the inner paint, is not damaged by the thread will, because in the task of such a can described above, the thread will be in contact with the inside of the can. The method and device should be integrable into known production lines for the production of deep-drawn, deep-drawn and drawn or extruded, lacquered aluminum cans, i.e. the thread must be able to be produced in the same clamping in which the other work steps such as neck pulling, cutting the can etc are carried out in a cycle time of approx. 0.3 to 0.6 sec and an effective machining time of 0.035 to 0.07 sec. The cans should not have to be cleaned after the thread has been attached, that is to say that process and device must do without the addition of lubricant or that a lubricant is used which does not impair the can contents or the appearance of the can.

Diese Aufgabe wird gelöst durch das Verfahren und die Vorrichtung gemäss den unabhängigen Patentansprüchen. In den abhängigen Patentansprüchen werden Ausführungsvarianten aufgezeigt.This object is achieved by the method and the device according to the independent patent claims. Design variants are shown in the dependent patent claims.

Die wichtigsten Merkmale des erfindungsgemässen Verfahrens sind die folgenden: Das Gewinde wird durch ein auf der äusseren Halsseite rollendes Werkzeug und ein quasi stationäres, das Dosenmaterial von innen stützendes Werkzeug auf der Innenseite des Halses erzeugt. Die beiden Werkzeuge arbeiten derart zwangsgesteuert, dass zwischen Hals und Werkzeug ein Schlupf entsteht. Dadurch kann weitgehend verhindert werden, dass sich das Halsmaterial vor den Werkzeugen aufstaut und in der Bewegungsrichtung der Werkzeuge verschoben wird, was zu ovalen Gewinden führen und den Lack in hohem Masse beanspruchen und beschädigen würde.The most important features of the method according to the invention are as follows: The thread is produced by a tool that rolls on the outside of the neck and a quasi-stationary tool on the inside of the neck that supports the can material from the inside. The two tools operate in a force-controlled manner so that there is slippage between the neck and the tool. This largely prevents the neck material from building up in front of the tools and shifting in the direction of movement of the tools, which would lead to oval threads and would stress and damage the paint to a great extent.

Anhand der folgenden Figuren sollen nun das erfindungsgemässe Verfahren, die erfindungsgemässe Vorrichtung und die durch das erfindungsgemässe Verfahren hergestellte Aluminiumdose detailliert beschrieben werden. Dabei zeigen:

Figur 1
eine schematische Übersicht über die einzelnen Verfahrensschritte des erfindungsgemässen Verfahrens;
Figur 2 a und b
eine detaillierte Darstellung für den Verfahrensschritt des Gewinderollens als Draufsicht auf die Dose und die verwendeten Werkzeuge vor (Fig. 2a) und während (Fig 2b) dem Gewinderollen;
Figur 3 a und b
wie Figuren 2a und 2b, aber als Schnitt entlang der Rotationsachse der Dose;
Figur 4
eine schematische Darstellung einer beispielhaften Ausführungsform der erfindungsgemässen Vorrichtung, geschnitten entlang der Rotationsachse der zu bearbeitenden Dose;
Figur 5
eine nach dem erfindungsgemässen Verfahren hergestellte Aluminiumdose entlang ihrer Rotationsachse geschnitten.
The method according to the invention, the device according to the invention and the aluminum can produced by the method according to the invention will now be described in detail with reference to the following figures. Show:
Figure 1
a schematic overview of the individual process steps of the inventive method;
Figure 2a and b
a detailed representation of the process step of thread rolling as a top view of the can and the tools used before (Fig. 2a) and during (Fig 2b) the thread rolling;
Figure 3 a and b
like Figures 2a and 2b, but as a section along the axis of rotation of the can;
Figure 4
a schematic representation of an exemplary embodiment of the device according to the invention, cut along the axis of rotation of the can to be processed;
Figure 5
cut an aluminum can produced by the method according to the invention along its axis of rotation.

Figur 1 zeigt die prinzipiellen Verfahrensschritte des erfindungsgemässen Verfahrens. Dabei ist das Verfahren als Verfahrens-Blockschema dargestellt und darunter schematisch die durch die einzelnen Verfahrensschritte erzeugten Formveränderungen an der Dose, und zwar als Draufsicht und als Längsschnitt durch den Halsteil der Dose. Figure 1 shows the basic method steps of the inventive method. The process is shown as a process block diagram and below it schematically the changes in shape of the can produced by the individual process steps, namely as a top view and as a longitudinal section through the neck part of the can.

Aus flachen, meist runden Stücken einer tiefziehfähigen oder fliesspressbaren Aluminniumlegierung werden in bekannter Weise durch Tiefziehen, durch Tiefziehen und zusätzliches Abstrecken oder durch Fliesspressen zylindrische Dosen hergestellt. Dabei soll die Wandstärke der Dose maximal 20% der Steigung des für die Dose vorgesehenen Gewindes messen.Flat, usually round pieces of a deep-drawable or extrudable aluminum alloy are made in a known manner by deep drawing Deep drawing and additional stretching or cylindrical cans produced by extrusion. The wall thickness of the can should measure a maximum of 20% of the pitch of the thread provided for the can.

Nach dem Ziehen, Ziehen und Abstrecken oder Fliesspressen werden die Dosen zur Entfernung des für das Ziehen notwendigen Gleitmittels gereinigt. Dann werden sie in einem ersten Schritt des erfindungsgemässen Verfahrens A (Lackierung) innen und aussen lackiert und eventuell bedruckt, solange sie eine zylindrische Form haben. Die verwendeten Lacke sind beispielsweise Polyester- oder Epoxiphenollacke. Sie werden für erhöhte Flexibilität, für erhöhte Haftfähigkeit und für bessere Gleiteigenschaften mit einem oder mehreren Zusatzstoffen, die dem Fachmann als Weichmacher, Katalyten und Gleitmittel bekannt sind, versetzt. Die für die Lackierung verwendeten Vorrichtungen entsprechen bekannten derartigen Vorrichtungen, mit denen der Innenlack durch Versprühen, der Aussenlack mit einer entsprechenden Rolle aufgetragen wird. Nach dem Lackieren werden die Lacke entsprechend getrocknet und polymerisiert.After pulling, pulling and stretching or extrusion, the cans are cleaned to remove the lubricant required for pulling. Then, in a first step of method A (painting) according to the invention, they are painted on the inside and outside and possibly printed, as long as they have a cylindrical shape. The paints used are, for example, polyester or epoxy phenol paints. For increased flexibility, for increased adhesiveness and for better sliding properties, they are mixed with one or more additives known to the person skilled in the art as plasticizers, catalysts and lubricants. The devices used for painting correspond to known devices of this type, with which the inner paint is applied by spraying and the outer paint is applied with a corresponding roller. After painting, the paints are dried and polymerized accordingly.

Für die folgenden Verfahrensschritte werden die Dosen auf einen Drehtisch aufgespannt, durch dessen schrittweise Drehung sie in den Bereich aufeinanderfolgender Werkzeuge geführt werden, die auf einer Werkzeugplatte montiert sind. Eine entsprechende Vorrichtung ist beispielsweise in der CH-Patentschrift 394'998/65 (Lechner) beschrieben und wird als bekannt vorausgesetzt.For the following process steps, the cans are clamped onto a turntable, by means of which they are gradually rotated into the area of successive tools which are mounted on a tool plate. A corresponding device is described, for example, in Swiss Patent 394'998 / 65 (Lechner) and is assumed to be known.

In zwei folgenden Verfahrensschritten B und C wird jede Dose stufenweise eingezogen, wobei die beiden Verfahrensschritte je nach Durchmesser der Dose, je nach gewünschter Dosenform und je nach Material aus verschieden vielen, effektiven Einziehschritten mit verschiedenen Werkzeugen bestehen können. Beim ersten Einziehen B erhält die Dose eine verengende Schulter und ein im wesentlichen zylinderförmiges erstes Halsstück 10, beim zweiten Einziehen C wird an das erste Halsstück 10 ein zweites, engeres im wesentlichen zylindrisches Halsstück 20 angeschlossen. Der Aussendurchmesser d₁ des ersten Halsstückes 10 entspricht dabei im wesentlichen dem Aussendurchmesser des zu erstellenden Gewindes, der Aussendurchmesser d₂ des zweiten engeren Halsstückes 20 ist wenig kleiner als der Kerndurchmesser d₃ des zu erstellenden Gewindes.In two subsequent process steps B and C, each can is drawn in in stages, the two process steps, depending on the diameter of the can, the desired can shape and the material, consisting of different numbers of effective drawing-in steps with different tools can. When B is first drawn in, the can has a narrowing shoulder and an essentially cylindrical first neck piece 10, and when second C is drawn in, a second, narrower, essentially cylindrical neck piece 20 is connected to first neck piece 10. The outside diameter d 1 of the first neck piece 10 corresponds essentially to the outside diameter of the thread to be created, the outside diameter d 2 of the second narrower neck piece 20 is slightly smaller than the core diameter d 3 of the thread to be created.

Die Form der eingezpogenen Schulter ist für das erfindungsmässige Verfahren nicht relevant. Selbstverständlich ist es auch möglich, eine Dose ohne Schulter, also eine im wesentlichen zylindrische Dose mit einem Gewinde zu versehen. In einem solchen Falle entfällt der Verfahrensschritt B.The shape of the shoulder pulled in is not relevant for the method according to the invention. Of course, it is also possible to thread a can without a shoulder, that is to say an essentially cylindrical can. In such a case, process step B is omitted.

Verfahren und Werkzeuge zum Einziehen von Aluminiumdosen sind dem Fachmann bekannt. Er kann sie auch für das Einziehen zu der beschriebenen Halsform durchaus adaptieren, sodass sie an dieser Stelle nicht beschrieben werden müssen.Methods and tools for pulling in aluminum cans are known to the person skilled in the art. He can also adapt them for pulling in to the described neck shape, so that they do not have to be described here.

In einem folgenden Verfahrensschritt D wird auf das erste Halsstück 10 oder auf den dem zweiten Halsstück 20 zugewandten Teil des ersten Halsstückes 10 ein Gewinde 30 aufgerollt. Das Gewinde wird erzeugt durch eine um den äusseren Umfang des ersten Halsstückes 10 abrollende Gewinderolle, die gegen eine quasi stationäre Gewindeschablone im Innern des Halses gedrückt wird. Das Gewinde wird also von der Aussenseite des Halses gegen innen gedrückt, sodass der Aussendurchmesser des fertig gerollten Gewindes dem ursprünglichen Halsdurchmesser d₁ entspricht. Sein Kerndurchmesser d₃ ist um weniges grösser als der Aussendurchmesser d₂ des zweiten Halsstückes 20.In a subsequent method step D, a thread 30 is rolled up on the first neck piece 10 or on the part of the first neck piece 10 facing the second neck piece 20. The thread is produced by a thread roll rolling around the outer circumference of the first neck piece 10, which is pressed against a quasi-stationary thread template in the interior of the neck. The thread is thus pressed from the outside of the neck towards the inside, so that the outside diameter of the finished rolled thread corresponds to the original neck diameter d 1. Its core diameter d₃ is a little larger than the outer diameter d₂ of the second neck piece 20th

Das Gewinde läuft gegen das zweite Halsstück 20 aus, das heisst es erstreckt sich nicht bis zur Halskante. Dadurch wird verhindert, dass die Halskante durch das Gewinderollen aus ihrer exakt kreiszylindrischen Form deformiert wird.The thread runs against the second neck piece 20, that is, it does not extend to the edge of the neck. This prevents the neck edge from being deformed from its exactly circular cylindrical shape by the thread rolling.

Die für den Verfahrensschritt D eingesetzte, erfindungsgemässe Vorrichtung wird im Zusammenhang mit den Figuren 2, 3 und 4 noch detaillierter beschrieben.The device according to the invention used for method step D is described in more detail in connection with FIGS. 2, 3 and 4.

In einem folgenden Verfahrensschritt E wird der Dosenhals abgelängt, beispielsweise unmittelbar über dem oberen Auslauf des Gewindes. Soll die Dose im Zusammenhang mit einer Handpumpe verwendet werden, muss die Verbindung zwischen Halskante und Pumpenanschluss dicht sein. Je nach verwendetem Dichtungstyp kann es vorteilhaft sein, die Stirnfläche des Dosenhalses gerade oder leicht schief auszugestalten. Verfahren und Vorrichtungen zum Ablängen von Dosenhälsen sind bekannt und müssen deshalb an dieser Stelle nicht beschrieben werden.In a subsequent process step E, the can neck is cut to length, for example directly above the upper outlet of the thread. If the box is to be used in connection with a hand pump, the connection between the neck edge and the pump connection must be tight. Depending on the type of seal used, it can be advantageous to design the end face of the can neck to be straight or slightly crooked. Methods and devices for cutting can necks to length are known and therefore need not be described here.

Um eine kontinuierliche, schnelle und ökonomische Produktion zu gewährleisten, ist es notwendig, die Verfahrensschritte B, C, D und E bei derselben Aufspannung der Dose durchzuführen. Das heisst aber auch, dass die Verfahrensschritte sich einem Grundtakt, der durch eine entsprechende Produktionsmaschine gegeben ist, unterordnen müssen. Soll das Gewinde in einem derartigen Takt gerollt werden, bedeutet das bei einer heute üblichen Produktionsgeschwindigkeit von zwischen 100 und 200 Dosen pro Minute, dass für das Gewinderollen eine Zykluszeit von zwischen 0,6 und 0,3 Sekunden zur Verfügung steht, in der die Dose an den entsprechenden Ort bewegt, die Werkzeuge in Arbeitsposition gebracht werden und das Gewinde gerollt wird.In order to ensure continuous, fast and economical production, it is necessary to carry out process steps B, C, D and E with the same clamping of the can. However, this also means that the process steps must be subordinated to a basic cycle, which is provided by a corresponding production machine. If the thread is to be rolled in such a cycle, at a production speed of between 100 and 200 cans per minute, which is common today, this means that a cycle time of between 0.6 and 0.3 seconds is available for the thread rolling in which the can moved to the appropriate place, the tools are brought into the working position and the thread is rolled.

Für den effektiven Vorgang des Gewinderollens steht eine Arbeitszeit von zwischen 0,035 und 0,07 sec zur Verfügung.A working time of between 0.035 and 0.07 sec is available for the effective process of thread rolling.

Figuren 2a und b zeigen nun in einer Draufsicht im Detail das Verfahren und die Werkzeuge, die zum Rollen des Gewindes eingesetzt werden. Figur 2a zeigt die Werkzeuge vor dem Gewinderollvorgang, Figur 2b während dem Gewinderollvorgang. Figures 2a and b now show a top view in detail of the method and the tools used to roll the thread. Figure 2a shows the tools before the thread rolling process, Figure 2b during the thread rolling process.

Von der Dose ist nur die kreisringförmige Stirnfläche 21 des zweiten Halsstückes 20 mit dem Aussendurchmesser d₂ und das erste Halsstück 10 mit dem Aussendurchmesser d₁ dargestellt. Für den Gewinderollvorgang wird eine im wesentlichen zylinderförmige oder leicht kegelstumpfförmige Gewindeschablone 40 in den Dosenhals eingeführt. Der grösste Durchmesser der Schablone ist derart, dass sie ohne Schwierigkeiten durch das zweite Halsstück 20 eingeführt werden kann. Auf ihrer Seitenfläche trägt die Schablone ein leicht verzerrtes, negatives Abbild 41 des zu rollenden Gewindes, das in dieser Draufsicht gestrichelt angedeutet ist. Während dem Einführvorgang sind der Dosenhals und die Schablone koaxial angeordnet, das heisst ihre Drehachsen S und T fallen zusammen.From the can, only the annular end face 21 of the second neck piece 20 with the outside diameter d 2 and the first neck piece 10 with the outside diameter d 1 is shown. For the thread rolling process, an essentially cylindrical or slightly frustoconical thread template 40 is inserted into the can neck. The largest diameter of the template is such that it can be inserted through the second neck piece 20 without difficulty. On its side surface, the template carries a slightly distorted, negative image 41 of the thread to be rolled, which is indicated by dashed lines in this top view. During the insertion process, the can neck and the template are arranged coaxially, that is, their axes of rotation S and T coincide.

Vorteilhafterweise gleichzeitig mit dem Einführen der Gewindeschablone in den Dosenhals wird ausserhalb des Dosenhalses eine Gewinderolle 50 positioniert, die derartig mit einer Gewindeform (ausgebildet als sich spiralförmig um die Rolle ziehender Wulst 51) ausgestaltet ist, dass sie, ohne achsial bewegt zu werden, das ganze Gewinde rollen kann. Beim Einführvorgang ist die Gewinderolle derart vom Hals beabstandet, dass sie diesen nicht berührt.Advantageously, at the same time as the thread template is being inserted into the can neck, a threaded roller 50 is positioned outside the can neck, which is designed with a thread shape (designed as a spiral 51 around the roller) that it can be used without moving axially Thread can roll. During the insertion process, the thread roll is spaced from the neck in such a way that it does not touch it.

Für den effektiven Gewinderollvorgang werden nun die Schablone 40 und die Gewinderolle 50 durch Verschieben ihrer Achsen T und U derart gegeneinander bewegt, dass die Schablone 40 dort, wo aussen die Gewinderolle 50 positioniert ist, die Innenoberfläche des ersten Halsstückes berührt und die Gewindeform 51 der Gewinderolle 50 um die Gewindetiefe des zu rollenden Gewindes in das Halsmaterial gedrückt wird. Gleichzeitig wird die Gewinderolle 50 auf dem Hals abgerollt und damit koordiniert die Rotationsachse der Schablone derart um die Rotationsachse der Dose gedreht, dass die Schablone immer dort am Hals anliegt und das Halsmaterial stützt, wo die Gewinderolle gerade abrollt.For the effective thread rolling process, the template 40 and the thread roller 50 are moved against one another by shifting their axes T and U such that the template 40, where the thread roller 50 is positioned on the outside, touches the inner surface of the first neck piece and the thread shape 51 of the thread roller 50 by the thread depth of the thread to be rolled is pressed into the neck material. At the same time, the thread roll 50 is unwound on the neck and thus coordinates the axis of rotation of the template rotated about the axis of rotation of the can such that the template always rests against the neck and supports the neck material where the thread roll is currently rolling.

In diesem geschlossenen Zustand werden die beiden Werkzeuge mindestens einmal um den Dosenhals bewegt und so das Gewinde erzeugt.In this closed state, the two tools are moved around the can neck at least once, thus creating the thread.

Wenn das Gewinde gerollt ist, werden Schablone 40 und Gewinderolle 50 wieder in die für das Einführen beschriebene Position (Fig. 2a) gebracht und in achsialer Richtung von der Dose entfernt.When the thread is rolled, the template 40 and thread roll 50 are brought back into the position described for the insertion (FIG. 2a) and removed in the axial direction from the can.

Beim Rollen des Gewindes wird die Gewinderolle 50 derart zwangsgesteuert abgerollt, dass die auf der Rolle abgerollte Umfangsstrecke grösser ist als die auf dem Hals abgerollte Umfangsstrecke. Zwischen Gewinderolle und Hals entsteht dadurch ein Schlupf, sodass die Gewinderolle sich zwar in einer Richtung über den Halsumfang abrollt, dabei aber immer auch in der entgegengesetzten Richtung auf der Halsoberfläche rutscht. Durch diesen Schlupf, durch den eine Kraft entgegen der Bewegungsrichtung der Gewinderolle 50 auf das Halsmaterial entsteht, wird verhindert, dass die Rolle das Halsmaterial vor sich her aufstaut und in Abrollrichtung verschiebt.When the thread rolls, the thread roll 50 is unrolled in a positively controlled manner in such a way that the circumferential distance rolled on the roll is greater than the circumferential distance rolled on the neck. This creates a slip between the thread roll and the neck, so that the thread roll rolls over the neck circumference in one direction, but always slips on the surface of the neck in the opposite direction. This slip, which creates a force against the direction of movement of the threaded roller 50 on the neck material, prevents the roller from jamming the neck material in front of it and shifting it in the unwinding direction.

Da der Umfang der Gewindeschablone 40 kleiner ist als der Innenumfang des ersten Halsstückes 10, das sie während dem Gewinderollvorgang abzustützen hat, entsteht auch zwischen der Schablone 40 und der Innenoberfläche des ersten Halsstückes 10 ein Schlupf, derart, dass die Schablone 40 auf der Halsinnenoberfläche in der Bewegungsrichtung der Gewinderolle 50 rutscht.Since the circumference of the thread template 40 is smaller than the inner circumference of the first neck piece 10, which it has to support during the thread rolling process, a slip also arises between the template 40 and the inner surface of the first neck piece 10, such that the template 40 on the neck inner surface in the direction of movement of the thread roll 50 slips.

Durch diesen beidseitigen Schlupf ergeben sich die besonders vorteilhaften Verfahrensumstände, die dazu führen, dass der Rundlauf des Gewindes gewährleistet ist und dass die Lackierung der Dose nicht verletzt wird. Das Rutschen der Gewinderolle und der Schablone hinterlässt auf dem Lack Spuren, die als leichte Oberflächenveränderungen der Lackierung im Gebiete des Gewindes erkennbar sind.This double-sided slippage results in the particularly advantageous procedural circumstances, which ensure that the concentricity of the thread is ensured and that the coating on the can is not damaged. The slipping of the thread roll and the stencil leaves marks on the lacquer, which can be recognized as slight changes in the surface of the lacquer in the area of the thread.

Figuren 3a und 3b zeigen entsprechend den Figuren 2a und 2b die für den Gewinderollvorgang eingesetzten Werkzeuge vor (Fig. 3a) und während (Fig. 3b) dem Gewinderollvorgang, und zwar als Schnitt entlang der Rotationsachse der Dose, wobei nur die eine Seite des Dosenhalses dargestellt ist. In diesen Figuren sind die Ausgestaltungen der Gewindeschablone 40 und der Gewindeform 51 der Gewinderolle 50 deutlich sichtbar. Die Gänge 41 der Gewindeschablone brauchen der Form des fertigen Gewindes nur in der Gangtiefe und der Steigung zu entsprechen, sollen aber da, wo sie mit der verformten Innenoberfläche in Berührung kommen, keine scharfen Kanten aufweisen. Die Gewindeform 51 der Gewinderolle 50 hingegen muss in ihrer Form der Gangform des zu erstellenden Gewindes entsprechen. Vorteilhafterweise ist die Gewindeschablone 40 derart ausgestaltet, dass sie nicht nur die Innenoberfläche des ersten Halsstückes 10, sondern auch mindestens teilweise die Innenoberfläche des zweiten Halsstückes 20 stützt, obschon darauf kein Gewinde gerollt wird. FIGS. 3a and 3b show, corresponding to FIGS . 2a and 2b, the tools used for the thread rolling process before (FIG. 3a) and during (FIG. 3b) the thread rolling process, specifically as a section along the axis of rotation of the can, only one side of the can neck is shown. In these figures, the configurations of the thread template 40 and the thread shape 51 of the thread roll 50 are clearly visible. The threads 41 of the thread template need only correspond to the shape of the finished thread in depth and pitch, but should not have any sharp edges where they come into contact with the deformed inner surface. The thread shape 51 of the thread roll 50, however, must correspond in shape to the shape of the thread to be created. The thread template 40 is advantageously designed in such a way that it not only supports the inner surface of the first neck piece 10, but also at least partially the inner surface of the second neck piece 20, although no thread is rolled thereon.

Figur 4 zeigt schematisch die erfindungsrelevanten Teile einer Vorrichtung zum Gewinderollen an Dosen in einer beispielhaften Ausführungsform. Die Figur ist ein Schnitt entlang der Rotationsachse S der Dose. Von der Dose sind die beiden Halsstücke 10 und 20 sichtbar. Die Gewindeschablone 40 und die Gewinderolle 50 sind in einer Position, die ihrer Position in den Figuren 2b und 3b entsprechen. Die Achse T der Schablone 40 liegt nicht auf der Rotationsachse S der Dose, die Gewinderolle 50 drückt in das Halsmaterial. FIG. 4 schematically shows the parts of a device for thread rolling on cans relevant to the invention in an exemplary embodiment. The figure is a section along the axis of rotation S of the can. The two neck pieces 10 and 20 are visible from the can. The thread template 40 and the thread roller 50 are in a position which corresponds to their position in FIGS. 2b and 3b. The axis T of the template 40 does not lie on the axis of rotation S of the can, the thread roller 50 presses into the neck material.

Dargestellt sind vor allem die Mittel 60, mit deren Hilfe der Schlupf zwischen der Gewinderolle 50 und dem Dosenhals erzeugt wird. Es handelt sich dabei um einen Zahnkranz 61, der an der Welle 42 der Schablone 40 angebracht ist, und einen in diesem Zahnkranz 61 laufenden, zweiten Zahnkranz 62, der an der Gewinderolle 50 angebracht ist. Wird nun die Achse U der Gewinderolle 50 um die Achse T der Schablone 40 bewegt, rollt sich die Gewinderolle durch den Zahnantrieb 60 zwangsgesteuert auf dem Dosenhals ab. Da der Abwälzradius r der Gewinderolle 50 auf dem Dosenhals kleiner ist als der Wälzradius R des Zahnkranzes 61 entsteht zwischen Gewinderolle 50 und Dosenhals ein Schlupf und zwar derart, dass die Gewinderolle 50 auf dem Halsmaterial gegen ihre Ablaufrichtung rutscht.Above all, the means 60 are shown, with the aid of which the slip between the thread roll 50 and the can neck is generated. It is a ring gear 61 that is attached to the shaft 42 of the template 40, and a second ring gear 62 running in this ring gear 61 that is attached to the thread roller 50. If the axis U of the thread roll 50 is now moved about the axis T of the template 40, the thread roll rolls on the can neck in a force-controlled manner by the toothed drive 60. Since the rolling radius r of the thread roll 50 on the can neck is smaller than the rolling radius R of the ring gear 61, a slip occurs between the thread roll 50 and the can neck in such a way that the thread roll 50 slides on the neck material against its direction of travel.

Es hat sich als vorteilhaft erwiesen, die beiden Radien r und R derart zu wählen, dass R : r ≧ 1,1 ist.It has proven to be advantageous to choose the two radii r and R such that R: r ≧ 1.1.

In der Figur nicht dargestellt sind die Antriebe für die achsiale Bewegung der Vorrichtungsteile vor und nach dem effektiven Gewinderollvorgang und für die Drehbewegung der Gewinderolle 50 um den Dosenhals und die damit gekoppelte Kreisbewegung der Achse T. Für die achsiale Bewegung wird vorteilhafterweise die getaktete Bewegung der Werkzeugplatte, auf der auch die Werzeuge für die anderen Verfahrensschritte montiert sind, ausgenutzt.Not shown in the figure are the drives for the axial movement of the device parts before and after the effective thread rolling process and for the rotary movement of the thread roll 50 around the can neck and the circular movement of the axis T coupled therewith. The clocked movement of the tool plate is advantageously used for the axial movement , on which the tools for the other process steps are also mounted.

Die Kreisbewegung der Gewinderolle wird beispielsweise mit einem Riemenantrieb angetrieben.The circular movement of the thread roll is driven, for example, with a belt drive.

Die Koppelung der Bewegung der Gewinderolle 50 und der Achse T der Schablone 40 sowie die Steuerung der relativen Bewegung der beiden Achsen T und U vor und nach dem effektiven Gewinderollvorgang können durch entsprechende asymmetrische Keilanordnungen realisiert werden, wobei die relative Bewegung der beiden Achsen durch eine relative Bewegung in achsialer Richtung dieser Keilanordnungen realisiert wird.The coupling of the movement of the thread roll 50 and the axis T of the template 40 and the control of the relative movement of the two axes T and U before and after the effective thread rolling process can be realized by corresponding asymmetrical wedge arrangements, the relative movement of the two axes by a relative Movement in the axial direction of these wedge arrangements is realized.

Die Bewegung der Achse T um die Achse S kann derart realisiert sein, dass die Achse T einen Zylindermantel um die Achse S beschreibt, oder aber dass die Achse T einem Kegel um die Achse S beschreibt. Für den Fall der Zylinderbewegung muss die Schablone 40 zylinderförmig, für den Fall der Kegelbewegung muss die Schablone 40 entsprechend kegelstumpfförmig, mit in die Dose weisendem verjüngtem Ende ausgestaltet sein.The movement of the axis T around the axis S can be realized in such a way that the axis T describes a cylinder jacket around the axis S, or that the axis T describes a cone about the axis S. In the case of the cylinder movement, the template 40 must be cylindrical, in the case of the cone movement, the template 40 must be configured in the form of a truncated cone, with the tapered end pointing into the can.

Figur 5 zeigt eine mit einer Handpumpe 70 verschlossene Dose, an der nach dem erfindungsgemässen Verfahren ein Gewinde angebracht wurde. Das Gewinde kann jeder Norm für derartige Gewinde entsprechen, beispielsweise der Euronorm. Es zeigt sich, dass Gewinde, die nach dem erfindungsgemässen Verfahren hergestellt werden, eine Genauigkeit von ca. ±0,1mm aufweisen, eine Genauigkeit, die die Genauigkeit entsprechender Kunststoff- oder Glasgewinde weit übersteigt. Aus diesem Grunde ist es auch, wie in der Figur 5 dargestellt, nicht notwendig, durch einen entsprechenden Einstich am der Schulter zugewandten Ende des Dosenhalses die Zentrierung der aufgeschraubten Pumpe zu verbessern. Die Form des Dosenboders ist für das erfindungsgemässe Verfahren nicht relevant. Die dargestellte Dose weist beispielsweise einen nach innen gewölbten Boden auf. FIG. 5 shows a can closed with a hand pump 70, to which a thread was attached using the method according to the invention. The thread can correspond to any standard for such threads, for example the Euronorm. It can be seen that threads which are produced by the method according to the invention have an accuracy of approximately ± 0.1 mm, an accuracy which far exceeds the accuracy of corresponding plastic or glass threads. For this reason, it is also not necessary, as shown in FIG. 5, to improve the centering of the screwed-on pump by a corresponding puncture at the end of the can neck facing the shoulder. The shape of the can bottom is not relevant for the method according to the invention. The can shown has, for example, an inwardly curved base.

Claims (16)

Verfahren zur Herstellung von Aluminiumdosen mit Gewinde, insbesondere von innen und aussen lackierten Aluminiumdosen mit Gewinde, durch Herstellung einer zylindrischen Dose mittels Tiefziehen, Tiefziehen und Abstrecken oder Fliesspressen, durch Lackieren der zylindrischen Dose und nachfolgendes Einziehen, Gewinderollen und Ablängen dadurch gekennzeichnet, dass die Verfahrersschritte Einziehen, Gewinderollen und Ablängen alle bei derselben Aufspannung der Dose durchgeführt werden und dass beim Rollen des Gewindes die Werkzeuge derart geführt werden, dass zwischen Werkzeugen und Dosenmaterial ein Schlupf entsteht.Process for the production of aluminum cans with thread, in particular aluminum cans with thread painted from the inside and outside, by producing a cylindrical can by means of deep drawing, deep drawing and stretching or extrusion, by painting the cylindrical can and subsequent drawing in, thread rolling and cutting to length, characterized in that the process steps Pulling, thread rolling and cutting to length are all carried out with the same clamping of the can and that when the thread is rolled the tools are guided in such a way that there is slippage between the tools and the can material. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das Gewinde zwischen einer im Hals positionierten Gewindeschablone (40) und einer um den Hals abrollenden Gewinderolle (50) gerollt wird, wobei die Gewinderolle (50) das Halsmaterial in die Schablone (40) presst und die Schablone (40) den Hals lediglich stützt.Method according to claim 1, characterized in that the thread is rolled between a thread template (40) positioned in the neck and a thread roll (50) rolling around the neck, the thread roll (50) pressing the neck material into the template (40) and the Template (40) only supports the neck. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass die Gewinderolle (50) derart zwangsgesteuert um den Hals abgerollt wird, dass zwischen Halsmaterial und Gewinderolle (50) ein Schlupf erzeugt wird.A method according to claim 2, characterized in that the thread roll (50) is rolled around the neck in a force-controlled manner in such a way that a slip is generated between the neck material and the thread roll (50). Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass die Gewinderolle (50) auf dem Hals entgegen ihrer Abrollrichtung rutscht.A method according to claim 3, characterized in that the thread roll (50) slips on the neck against its rolling direction. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass während dem Gewinderollen zwischen der Schablone (40) und der Innenoberfläche des Halses ein Schlupf entsteht.Method according to one of claims 1 to 4, characterized in that a slip occurs during the thread rolling between the template (40) and the inner surface of the neck. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Schablone (40) auf der Halsinnenoberfläche in der Richtung der Abrollbewegung der Gewinderolle (50) rutscht.A method according to claim 5, characterized in that the template (40) slips on the inner surface of the neck in the direction of the rolling motion of the thread roll (50). Verfahren nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass zum Lackieren der Dosen Lacke verwendet werden, die durch Zusatzstoffe derart modifiziert sind, dass sie eine erhöhte Haftfähigkeit, erhöhte Flexibilität und verbesserte Gleiteigenschaften aufweisen.Method according to one of the preceding claims, characterized in that lacquers are used to lacquer the cans, which are modified by additives in such a way that they have increased adhesion, increased flexibility and improved sliding properties. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die Zusatzstoffe Katalyten, Weichmacher und/oder Gleitmittel sind.A method according to claim 7, characterized in that the additives are catalytes, plasticizers and / or lubricants. Verfahren nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass vor dem Gewinderollen die Dose zu mindestens einem, im wesentlichen zylindrischen Halsstück (20) eingezogen wird und dass der Aussendurchmesser dieses Halsstückes im wesentlichen dem Kerndurchmesser des zu rollenden Gewindes entspricht.Method according to one of the preceding claims, characterized in that before the thread rolling the can is drawn into at least one essentially cylindrical neck piece (20) and that the outside diameter of this neck piece essentially corresponds to the core diameter of the thread to be rolled. Vorrichtung zum Rollen von Gewinden an lackierten Aluminiumdosen nach dem Verfahren gemäss einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass sie eine Gewindeschablone (40) für die Abstützung des Halses von innen, eine Gewinderolle (50) für das Rollen des Gewindes von aussen aufweist und dass sie ferner Steuermittel aufweist, die die Bewegung der Schablone (40) und der Gewinderolle (50) koordinieren und die Bewegungen der Werkzeuge derart ablaufen lassen, dass zwischen Dosenhals und Werkzeugen ein Schlupf entsteht.Device for rolling threads on lacquered aluminum cans according to the method according to one of claims 1 to 9, characterized in that they have a thread template (40) for the Supporting the neck from the inside, has a thread roller (50) for rolling the thread from the outside and that it furthermore has control means which coordinate the movement of the template (40) and the thread roller (50) and allow the movements of the tools to proceed in this way, that there is a slip between the can neck and the tools. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Steuermittel zum Erzeugen des Schlupfs aus einem Zahnkranz (61) auf der Welle (42) der Schablone (40) und einem Zahnkranz (62) auf der Gewinderolle (50) bestehen und dass der Wälzkreis des Zahnkranzes (61) auf der Welle (42) der Schablone (40) grösser ist als der Abwälzkreis der Gewinderolle (50) auf dem Dosenhals.Apparatus according to claim 10, characterized in that the control means for generating the slip consist of a ring gear (61) on the shaft (42) of the template (40) and a ring gear (62) on the thread roller (50) and that the pitch circle of the Gear ring (61) on the shaft (42) of the template (40) is larger than the rolling circle of the thread roll (50) on the can neck. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Radius (R) des Wälzkreises des Zahnkranzes (61) sich zum Abwälzradius (r) der Gewinderolle (50) auf dem Dosenhals derart gewählt sind, dass R : r ≧ 1,1 ist.Apparatus according to claim 11, characterized in that the radius (R) of the pitch circle of the ring gear (61) is chosen to the rolling radius (r) of the thread roll (50) on the neck of the can such that R: r ≧ 1.1. Vorrichtung nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass die Steuermittel zur Koordination der radialen Bewegung der Schablone (40) und der Gewinderolle (50) Keilsysteme und Mittel zur Erzeugung einer relativen Achsialbewegung dieser Keilsysteme gegeneinander aufweisen.Device according to one of claims 10 to 13, characterized in that the control means for coordinating the radial movement of the template (40) and the thread roller (50) wedge systems and means for generating a relative axial movement of these wedge systems against each other. Lackierte Aluminiumdose mit Gewinde, hergestellt nach dem Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass sie in der Gegend des Gewindes auf der Lackoberfläche Rutschspuren der Werkzeuge zum Rollen des Gewindes aufweist.Lacquered aluminum can with thread, produced by the method according to one of claims 1 to 9, characterized in that that in the area of the thread on the lacquer surface there are traces of slipping of the tools for rolling the thread. Aluminiumdose nach Anspruch 14, dadurch gekennzeichnet, dass das Gewinde gegen die Dosenseite in ein Hals oder Dosenteil ausläuft, dessen Aussendurchmesser (d₁) dem Aussendurchmesser des Gewindes entspricht.Aluminum can according to claim 14, characterized in that the thread runs against the can side in a neck or can part, the outer diameter (d₁) corresponds to the outer diameter of the thread. Aluminiumdose nach Anspruch 12, dadurch gekennzeichnet, dass das Gewinde gegen die Halsöffnung in ein Halsstück (20) ausläuft, dessen Aussendurchmesser (d₂) im wesentlichen dem Kerndurchmesser des Gewindes entspricht.Aluminum can according to claim 12, characterized in that the thread runs against the neck opening into a neck piece (20), the outer diameter (d₂) of which essentially corresponds to the core diameter of the thread.
EP91810599A 1991-04-17 1991-07-26 Method of and device for manufacture of threaded cans made of aluminium Expired - Lifetime EP0510291B2 (en)

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CH114991 1991-04-17
CH114991 1991-04-17
CH1149/91 1991-04-17

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EP (1) EP0510291B2 (en)
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AT (1) ATE119441T1 (en)
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JP3375661B2 (en) 2003-02-10
JPH05229545A (en) 1993-09-07
EP0510291B2 (en) 2000-04-26
DE59104891D1 (en) 1995-04-13
ATE119441T1 (en) 1995-03-15
ES2073722T5 (en) 2000-11-01
EP0510291B1 (en) 1995-03-08
ES2073722T3 (en) 1995-08-16
US5293765A (en) 1994-03-15

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