EP1480768A1 - Device for reshaping and/or folding bodies of cans - Google Patents

Device for reshaping and/or folding bodies of cans

Info

Publication number
EP1480768A1
EP1480768A1 EP03714646A EP03714646A EP1480768A1 EP 1480768 A1 EP1480768 A1 EP 1480768A1 EP 03714646 A EP03714646 A EP 03714646A EP 03714646 A EP03714646 A EP 03714646A EP 1480768 A1 EP1480768 A1 EP 1480768A1
Authority
EP
European Patent Office
Prior art keywords
lever
tool
tools
actuator
swivel
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
EP03714646A
Other languages
German (de)
French (fr)
Other versions
EP1480768B1 (en
Inventor
Norbert Lentz
Steffen RÖTZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cantec & Co KG GmbH
Original Assignee
SIG Cantec GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SIG Cantec GmbH and Co KG filed Critical SIG Cantec GmbH and Co KG
Priority to SI200330228T priority Critical patent/SI1480768T1/en
Publication of EP1480768A1 publication Critical patent/EP1480768A1/en
Application granted granted Critical
Publication of EP1480768B1 publication Critical patent/EP1480768B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/04—Forming single grooves in sheet metal or tubular or hollow articles by rolling

Definitions

  • Device for forming and / or folding can bodies
  • the invention relates to a device for reshaping and / or folding can bodies by means of two counter-rotating molds, one of which is arranged radially on a lever.
  • can bodies are teased or beads are embossed by means of such devices.
  • the can bodies are reduced in diameter at one end or at the same time at both ends, whereby the round diameter of the bottom and lid of a can can be kept smaller.
  • a curve-controlled profiled inner tool moves into the can body, after which both then roll on an annular, internally profiled outer tool, whereby and with what the beading profile is produced on the circumference of the can body.
  • Beading is used to increase the resistance to implosion of a filled can, which is under pressure when the can has been hot filled and then sealed, so that a negative pressure forms inside the can when it cools down.
  • EP 0 772 501 B1 describes an example of a device for forming a tipped and flanged section at one end of a can frame.
  • two axially movable inner tools of which at least one can be driven in rotation, are used with a contour corresponding to the tipped and flanged end and an outer molding tool movable radially against the inner tools, the two inner tools being arranged on separate shafts, the axes of which are aligned with one another and wherein the inner tools with their respective shafts are additionally mounted so that they can be displaced against axial pressure.
  • a radially acting clamping device is arranged in the area of at least one internal tool provided for receiving the cylindrical hollow body and can be pressed against the inner wall of the cylindrical hollow body.
  • the outer molding tool can be set against the profile contours of the inner tools to form the tipped and flanged end to such an extent that the two inner tools be pushed apart axially.
  • the radial shaping of the second molding tool takes place by means of a swivel lever which, according to EP 0 772 501 B1, is provided with a driver part designed as a cam roller, which engages in a control groove which is arranged fixedly with respect to the body. Via this cam drive, the outer mold can be fed in or removed from the coaxial axes of the inner tools.
  • an eccentric can be used instead of a swivel lever.
  • the control curve provided determines the swivel path, the type of movement of the tool that is to be delivered in a linear, progressive, degressive or similar manner, and the respective location coordinates of the tool that can be delivered, in particular the start and end of the swivel movement relative to the inner tool, which is usually rotatable , but is stationary, at most axially movable.
  • the molding tools on the pivoting lever must be radially adjustable.
  • the mechanical effort for the pivot lever mechanism with an adjustable molding tool is complex. Adjusting the mold on the swivel lever or the mold on the swivel lever is time consuming.
  • Law of motion linear, progressive, degressive, etc.
  • control positions start and end of the swivel movement
  • execution of the swivel movement
  • the lever is connected to a controllable actuator, which has a motor with or without a reduction gear and an incremental encoder or angle encoder.
  • the lever is preferably, as is generally known from the prior art, designed as a pivot lever; however, it can also be a lever that can be guided linearly.
  • each swivel lever carries two tools which can be pivoted alternately into their working position as molding tools.
  • a calibration body is preferably provided, which can in particular be designed as a calibration ring, which, after a mold change, serves as a reference point for the zero point adjustment of the incremental encoder or angle encoder.
  • the device can also be implemented in the context of a multi-spindle rotary machine in such a way that each lever is connected to an individual actuator which can be controlled from the outside, so that the numerical control used can be freely adjusted by means of a suitable numerical control which is known in principle from the prior art Molding tools including possible regulations can be achieved.
  • a suitable numerical control which is known in principle from the prior art Molding tools including possible regulations can be achieved.
  • the device is designed in accordance with a development of the present invention in such a way that the actual current profile of the electric actuator can be detected as a function of the angle of rotation of this actuator and the force profile that can be determined therefrom is comparable to a stored force profile.
  • the faulty can frame can be sorted out if a permissible predetermined deviation is exceeded.
  • the process-related determination of product faults can also be used according to the invention to obtain a specific reference to the machine causing the fault, possibly in connection with its automatic shutdown, in the event of a fault accumulation. In this context, it is desirable to obtain a clear reference to the tool causing the problem.
  • the device according to the invention has a memory for the force profiles of typical causes of errors.
  • the force curve for a faultlessly executed forming or folding operation (including taking into account a permissible tolerance range) is dependent on the tool and workpiece, but is largely constant under the same process conditions.
  • certain setting and wear-related sources of error lead to a change in the physical quantities, in particular the force curve during forming or folding operations, which are very similar to one another, so that conclusions can be drawn about the specific cause of the error from the change in the force curve.
  • Fig. 1 shows the structure of an actuator in a schematic manner
  • Fig. 2 is a plan view of a multi-spindle rotary machine with several molds and
  • 3 is a plan view of an embodiment variant of the multi-spindle
  • the frame 11 is positioned and clamped on an inner tool or, as shown in the present case, on two inner tools 12 inserted on both sides.
  • the inner tools 12 can be rotated about their longitudinal axis.
  • the inner tools 12 are opposed by an outer tool 13 in the form of a tool roll, which is fixedly but rotatably mounted on a swivel lever 14.
  • This pivot lever 14 is controlled by an actuator, consisting of a motor 15, upstream of which a reduction gear 16 is connected, and an incremental encoder or angle encoder 17.
  • the angle encoder is preferably an absolute encoder, which allows the current swivel lever position to be determined even after a power failure.
  • a central control unit controls the motor 15 with respect to the swivel path or the swivel angle, the swivel movement, which can for example be linear, progressive, degressive or similar, and the control positions, in particular the start and the end of the swivel movement, according to previously entered parameters.
  • the read position of the incremental encoder or encoder 17, the position reached may be reported back in the form of a control loop.
  • On the control data and parameters are displayed on the display and input surface 19; new parameters for the control unit 18 can also be entered there.
  • FIG. 2 shows the arrangement of the actuators and swivel levers on a multi-spindle rotary machine with eight inner tools 12 and outer shaping tools 13 assigned to each of these inner tools, each of which is mounted on a swivel lever 14.
  • Each molding tool 13 can describe a swivel path S, this tool being controlled to and from the inner tool 12 by the servomotor 15, 16, 17.
  • Each of the actuators occurring n times can be controlled independently of any other.
  • a calibration ring 10 which is used for the automatic determination of the reference point for all tools after each change of the tool rollers 13, in which each pivot lever 14 is adjusted in the same direction until the tool roller touches the calibration ring and the angle encoder 7 on each pivot axis 0 "is set.
  • FIG. 3 shows a modification of the multi-spindle rotary machine according to FIG. 2 for a two-stage forming process.
  • outer tool rolls 13a and 13b are arranged at the end as molding tools which have different profiles.
  • the pivot levers 14 can be controlled via the servo motor 15, 16, 17.
  • position a the neutral center position (O position) is shown, in which the two outer tool rollers 13a and 13b are at a distance from an inner tool 12 with the can frame clamped on.
  • the outer tool roll 13a comes into engagement with the can frame clamped on the inner tool 12.
  • the swivel lever 14 is moved beyond the O position (see position e and while passing through the swivel path S2 into the position to position f) in which the second outer tool roller 13b engages with the internally rotating tool 12 or the frame which is clamped there
  • the ratio of the control times for the beginning and the end of the respective swivel path S1 and S2 can be freely selected.
  • the cyclical total movement of each swivel lever sets are made up of movement sections running in different directions. In a first section, ie when swiveling by the amount S1, the tool roller 13a is brought directly from the neutral central position into the working position. In the subsequent second section, a further forming or folding operation is then carried out by pivoting by the amount S2. With the device shown in FIG. 3, cans with different diameters can also be processed without changing tool parts.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
  • Transmission Devices (AREA)
  • Processing Of Meat And Fish (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

A can body is fitted to an inner shaping tool rotatable adjacent a freely rotatable outer shaping tool outside the can body. An arm having an outer end rotatably carrying the outer shaping tool and an inner end is pivotal about its inner end. The inner tool and the can body fitted thereto are rotated to entrain and rotate the outer tool. A motor controlledly pivots the arm and thereby moves the outer shaping tool toward and away from the inner shaping tool. A position detector connected to arm senses the angular position thereof and the relative spacing of the inner and outer tools. A controller including a memory controls the motor in accordance with a sensed angular position of the arm.

Description

Vorrichtung zum Umformen und/oder Falzen von DosenzargenDevice for forming and / or folding can bodies
Die Erfindung betrifft eine Vorrichtung zum Umformen und/oder Falzen von Dosenzargen mittels zwei gegenläufig rotierenden Formwerkzeugen, von denen eines auf einem Hebel radial zustellbar angeordnet ist.The invention relates to a device for reshaping and / or folding can bodies by means of two counter-rotating molds, one of which is arranged radially on a lever.
Insbesondere werden mittels solcher Vorrichtungen Dosenzargen geneckt oder Sicken eingeprägt. Beim Necken werden die Dosenzargen an einem Ende oder gleichzeitig an beiden Enden im Durchmesser reduziert, wodurch der Rondendurch- messer von Boden und Deckel einer Dose kleiner gehalten werden kann.In particular, can bodies are teased or beads are embossed by means of such devices. When teasing, the can bodies are reduced in diameter at one end or at the same time at both ends, whereby the round diameter of the bottom and lid of a can can be kept smaller.
Beim Sicken fährt ein kurvengesteuertes profiliertes Innenwerkzeug in den Dosenrumpf ein, wonach anschließend beide an einem ringförmigen, innenprofilierten Außenwerkzeug abrollen, wobei und womit das Sickenprofil am Umfang des Dosenrumpfes erzeugt wird. Sicken dienen zur Erhöhung der Implosionsfestigkeit einer gefüllten Dose, die unter einem Druck steht, wenn die Dose heiß abgefüllt und anschließend verschlossen worden ist, so dass sich beim Abkühlen im Doseninneren ein Unterdruck bildet.When beading, a curve-controlled profiled inner tool moves into the can body, after which both then roll on an annular, internally profiled outer tool, whereby and with what the beading profile is produced on the circumference of the can body. Beading is used to increase the resistance to implosion of a filled can, which is under pressure when the can has been hot filled and then sealed, so that a negative pressure forms inside the can when it cools down.
Ein Beispiel für eine Vorrichtung zur Bildung eines geneckten und gebördelten Abschnittes an einem Ende einer Dosenzarge beschreibt die EP 0 772 501 B1. Hierin werden zwei axial bewegbare Innenwerkzeuge, von denen mindestens eines drehantreibbar ist, mit einem dem geneckten und gebördelten Ende entsprechenden Kontur und ein radial gegen die Innenwerkzeuge bewegliches äußeres Formwerkzeug verwendet, wobei die beiden Innenwerkzeuge an getrennten Wellen angeordnet sind, deren Achsen miteinander fluchten und wobei die Innenwerkzeuge mit ihrer jeweiligen Welle zusätzlich gegen axialen Druck verschiebbar gelagert sind. In dem zur Aufnahme des zylindrischen Hohlkörpers vorgesehenen Bereich mindestens eines Innenwerkzeuges ist eine radial wirkende Spannvorrichtung angeordnet, die gegen die Innenwandung des zylindrischen Hohlkörpers andrückbar ist. Das äußere Formwerkzeug ist zur Bildung des geneckten und gebördelten Endes soweit gegen die Profilkonturen der Innenwerkzeuge zustellbar, dass die beiden Innenwerkzeuge hierbei axial auseinandergeschoben werden. Die radiale Zustellung des zweiten Formwerkzeuges erfolgt mittels eines Schwenkhebels, der nach der EP 0 772 501 B1 mit einem als Kurvenrolle ausgebildeten Mitnehmerteil versehen ist, der in eine fest in bezug auf den Körper angeordnete Steuernut eingreift. Über diesen Kurvenantrieb kann das äußere Formwerkzeug in Richtung auf die koaxialen Achsen der Innenwerkzeuge zugestellt oder von diesen entfernt werden. Alternativ kann statt eines Schwenkhebels auch ein Exzenter verwendet werden. Die vorgesehene Steuerkurve bestimmt den Schwenkweg, die Art der Bewegung des Werkzeuges, das linear, progressiv, degressiv oder ähnlich gesteuert zugestellt werden soll, sowie die jeweiligen Ortskoordinaten des zustellbaren Werkzeuges, insbesondere den Beginn sowie das Ende der Schwenkbewegung relativ zum Innenwerkzeug, das zumeist drehbar, aber ortsfest, allenfalls axial beweglich angeordnet ist.EP 0 772 501 B1 describes an example of a device for forming a tipped and flanged section at one end of a can frame. Herein, two axially movable inner tools, of which at least one can be driven in rotation, are used with a contour corresponding to the tipped and flanged end and an outer molding tool movable radially against the inner tools, the two inner tools being arranged on separate shafts, the axes of which are aligned with one another and wherein the inner tools with their respective shafts are additionally mounted so that they can be displaced against axial pressure. A radially acting clamping device is arranged in the area of at least one internal tool provided for receiving the cylindrical hollow body and can be pressed against the inner wall of the cylindrical hollow body. The outer molding tool can be set against the profile contours of the inner tools to form the tipped and flanged end to such an extent that the two inner tools be pushed apart axially. The radial shaping of the second molding tool takes place by means of a swivel lever which, according to EP 0 772 501 B1, is provided with a driver part designed as a cam roller, which engages in a control groove which is arranged fixedly with respect to the body. Via this cam drive, the outer mold can be fed in or removed from the coaxial axes of the inner tools. Alternatively, an eccentric can be used instead of a swivel lever. The control curve provided determines the swivel path, the type of movement of the tool that is to be delivered in a linear, progressive, degressive or similar manner, and the respective location coordinates of the tool that can be delivered, in particular the start and end of the swivel movement relative to the inner tool, which is usually rotatable , but is stationary, at most axially movable.
Um die tatsächlich erforderliche durch Schwankungen im Produkt variierende Hubendlage der schwenkbaren Formwerkzeuge zu erreichen, müssen die Formwerkzeuge auf dem Schwenkhebel radial einstellbar sein. Der mechanische Aufwand für den Schwenkhebelmechanismus mit einstellbarem Formwerkzeug ist aufwendig. Die Einstellungen des Formwerkzeuges auf dem Schwenkhebel bzw. der Formwerkzeuge auf den Schwenkhebeln ist zeitraubend.In order to achieve the stroke end position of the pivotable molding tools that varies as a result of fluctuations in the product, the molding tools on the pivoting lever must be radially adjustable. The mechanical effort for the pivot lever mechanism with an adjustable molding tool is complex. Adjusting the mold on the swivel lever or the mold on the swivel lever is time consuming.
Insbesondere bei Mehrkopfmaschinen mit einer Vielzahl von Formwerkzeugen müssen bei einem Wechsel des zu verarbeitenden Dosendurchmessers mindestens die jeweiligen Formwerkzeugrollen gewechselt werden, um die prozesstechnisch erforderlichen geometrischen Verhältnisse zu gewährleisten. Die Art der Bewegung, d. h. eine beispielsweise lineare progressive oder degressive Führung sowie die vorgesehenen Steuerpositionen sind nicht veränderbar. Die Schwenkhebelbewegung wird maschinenbedingt auch stets ausgeführt, d.h. auch dann, wenn kein Umform- oder Falzprodukt in das Werkzeug eingeführt wird. Ein Abschalten ist nur durch den zusätzlichen Aufwand einer mechanisch arbeitenden Schaltkupplung möglich. Es ist Aufgabe der vorliegenden Erfindung, die eingangs genannte Vorrichtung dahingehend zu verbessern, dass sie flexibler und schneller einstellbar ist, insbesondere im Hinblick auf die BewegungsparameterIn particular in the case of multi-head machines with a large number of molding tools, when changing the can diameter to be processed, at least the respective molding tool rolls have to be changed in order to ensure the geometric conditions required in terms of process technology. The type of movement, ie linear progressive or degressive guidance, for example, and the intended control positions cannot be changed. The pivoting lever movement is always carried out due to the machine, ie even if no formed or folded product is inserted into the tool. Switching off is only possible through the additional effort of a mechanically operating clutch. It is an object of the present invention to improve the device mentioned at the outset in such a way that it can be set more flexibly and more quickly, in particular with regard to the movement parameters
Schwenkweg (Hub),Swivel path (stroke),
Bewegungsgesetz (linear, progressiv, degressiv u.a.), Steuerpositionen (Beginn und Ende der Schwenkbewegung) und Durchführung der Schwenkbewegung.Law of motion (linear, progressive, degressive, etc.), control positions (start and end of the swivel movement) and execution of the swivel movement.
Diese Aufgabe wird durch die Vorrichtung nach Anspruch 1 gelöst. Erfindungsgemäß ist der Hebel mit einem steuerbaren Stellantrieb verbunden, der einen Motor mit oder ohne Untersetzungsgetriebe und einen Inkrementalgeber oder Winkelcodierer aufweist. Der Hebel ist bevorzugt, wie grundsätzlich nach dem Stand der Technik bekannt, als Schwenkhebel ausgebildet; er kann jedoch auch ein linear führbarer Hebel sein.This object is achieved by the device according to claim 1. According to the invention, the lever is connected to a controllable actuator, which has a motor with or without a reduction gear and an incremental encoder or angle encoder. The lever is preferably, as is generally known from the prior art, designed as a pivot lever; however, it can also be a lever that can be guided linearly.
Um zwei unterschiedliche Arbeitsoperationen nacheinander zeitsparend ausführen zu können, trägt nach einer Weiterbildung der Erfindung jeder Schwenkhebel zwei Werkzeuge, die abwechselnd als Formwerkzeuge in ihre Arbeitsposition verschwenkbar sind.In order to be able to carry out two different work operations one after the other in a time-saving manner, according to a further development of the invention, each swivel lever carries two tools which can be pivoted alternately into their working position as molding tools.
Vorzugsweise ist weiterhin ein Kalibrierkörper vorgesehen, der insbesondere als Kalibrierring ausgestaltet sein kann, der nach einem Formwerkzeugwechsel als Referenzpunkt zum Nullpunktsabgleich des Inkrementalgebers oder Winkelcodierers dient.Furthermore, a calibration body is preferably provided, which can in particular be designed as a calibration ring, which, after a mold change, serves as a reference point for the zero point adjustment of the incremental encoder or angle encoder.
Insbesondere kann die Vorrichtung auch im Rahmen einer Mehrspindel-Rotationsmaschine derart realisiert sein, dass jeder Hebel mit einem individuellen, von außen ansteuerbaren Stellantrieb verbunden ist, so dass über eine geeignete, im Prinzip nach dem Stand der Technik bekannte numerische Steuerung eine freie Einstellbarkeit der verwendeten Formwerkzeuge einschließlich möglicher Regelungen erzielbar ist. Bei den hochproduktiven Einrichtungen zur Massenproduktion von Dosen gewinnt die Qualitätskontrolle der hergestellten Produkte zunehmend an Bedeutung, um letztlich die Auslieferung von fehlerhaften Produkten zu verhindern. Die Ermittlung von Produktfehlern sollte dabei möglichst prozessnah erfolgen, damit die fehlerhaften Produkte unmittelbar nach ihrer Herstellung ausgesondert werden können. Hierzu ist die Vorrichtung nach einer Weiterbildung der vorliegenden Erfindung derart ausgestaltet, dass der Ist-Stromverlauf des elektrischen Stellantriebes als Funktion des Drehwinkels dieses Stellantriebes erfassbar und der daraus ermittelbare Kraftverlauf mit einem gespeicherten Kraftverlauf vergleichbar ist. Durch Vergleich der jeweiligen Kraftverläufe kann bei Überschreiten einer zulässigen vorgegebenen Abweichung die fehlerhafte Dosenzarge aussortiert werden.In particular, the device can also be implemented in the context of a multi-spindle rotary machine in such a way that each lever is connected to an individual actuator which can be controlled from the outside, so that the numerical control used can be freely adjusted by means of a suitable numerical control which is known in principle from the prior art Molding tools including possible regulations can be achieved. In the highly productive facilities for the mass production of cans, quality control of the manufactured products is becoming increasingly important in order to ultimately prevent the delivery of defective products. The determination of product defects should be as close to the process as possible so that the defective products can be sorted out immediately after their manufacture. For this purpose, the device is designed in accordance with a development of the present invention in such a way that the actual current profile of the electric actuator can be detected as a function of the angle of rotation of this actuator and the force profile that can be determined therefrom is comparable to a stored force profile. By comparing the respective force profiles, the faulty can frame can be sorted out if a permissible predetermined deviation is exceeded.
Die prozessnahe Ermittlung von Produktfehlern lässt sich erfindungsgemäß auch weiterhin dazu verwenden, bei einer Fehlerhäufung einen gezielten Hinweis auf die Fehler-verursachende Maschine, unter Umständen verbunden mit deren automatischer Stillsetzung, zu erhalten. Wünschenswert ist in diesem Zusammenhang, einen eineindeutigen Bezug auf das verursachende Werkzeug zu erhalten.The process-related determination of product faults can also be used according to the invention to obtain a specific reference to the machine causing the fault, possibly in connection with its automatic shutdown, in the event of a fault accumulation. In this context, it is desirable to obtain a clear reference to the tool causing the problem.
Hierzu besitzt die Vorrichtung erfindungsgemäß einen Speicher für die Kraftverläufe von typischen Fehlerursachen. Der Kraftverlauf für eine fehlerfrei ausgeführte Umform- oder Falzoperation (einschließlich der Berücksichtigung eines zulässigen Toleranzbereiches) ist zwar Werkzeug- und werkstückabhängig, jedoch bei gleichbleibenden Prozessbedingungen im großen und ganzen konstant. Andererseits führen bestimmte einstellungs- und verschleißbedingte Fehlerquellen zu einer Änderung der physikalischen Größen, insbesondere des Kraftverlaufes bei Umform- oder Falzoperationen, die einander stark ähneln, so dass aus der Veränderung des Kraftverlaufes Rückschlüsse auf die konkrete Fehlerursache gezogen werden können. Speichert man daher im Sinne einer Teach-in-Funktion die Kraftverläufe bei typischen oder verfahrensbedingt allmählich auftretenden Einstellfehlern oder einem verschleißbedingten Fehler, so kann frühzeitig entweder nach Abgabe eines Warnsignals durch einen Maschinenbediener oder durch eine entsprechend vorgesehene Regelung in der Maschine Abhilfe geschaffen werden. Durch Messung und Speicherung der physikalischen Größen des Stellantriebes lässt sich somit die Prozessqualität beurteilen.For this purpose, the device according to the invention has a memory for the force profiles of typical causes of errors. The force curve for a faultlessly executed forming or folding operation (including taking into account a permissible tolerance range) is dependent on the tool and workpiece, but is largely constant under the same process conditions. On the other hand, certain setting and wear-related sources of error lead to a change in the physical quantities, in particular the force curve during forming or folding operations, which are very similar to one another, so that conclusions can be drawn about the specific cause of the error from the change in the force curve. If you store the force curves for typical or procedural gradual setting errors or a wear-related error in the sense of a teach-in function, you can do so early either after a warning signal has been issued by a machine operator or by a correspondingly provided one Remedial regulation can be created in the machine. The process quality can thus be assessed by measuring and storing the physical parameters of the actuator.
Weitere Vorteile sowie Ausgestaltungen der Erfindung werden im folgenden anhand der Zeichnungen erläutert. Es zeigenFurther advantages and refinements of the invention are explained below with reference to the drawings. Show it
Fig. 1 in schematischer Weise den Aufbau eines Stellantriebes mitFig. 1 shows the structure of an actuator in a schematic manner
Schwenkhebel im Aufriss,Swivel lever in elevation,
Fig. 2 eine Draufsicht einer Mehrspindel-Rotationsmaschine mit mehreren Formwerkzeugen undFig. 2 is a plan view of a multi-spindle rotary machine with several molds and
Fig. 3 eine Draufsicht einer Ausführungsvariante der Mehrspindel-3 is a plan view of an embodiment variant of the multi-spindle
Rotationsmaschine nach Fig. 2.Rotary machine according to FIG. 2.
Aus der schematischen Abbildung nach Fig. 1 ist ersichtlich, dass auf einem Innenwerkzeug oder, wie im vorliegenden Fall dargestellt, auf zwei beidseitig eingeführten Innenwerkzeugen 12 die Zarge 11 positioniert und eingespannt wird. Die Innenwerkzeuge 12 können um ihre Längsachse rotierend bewegt werden. Den Innenwerkzeugen 12 steht ein Außenwerkzeug 13 in Form einer Werkzeugrolle gegenüber, die fest, aber drehbar auf einem Schwenkhebel 14 gelagert ist. Dieser Schwenkhebel 14 wird mit einem Stellantrieb, bestehend aus einem Motor 15, dem ein Untersetzungsgetriebe 16 vorgeschaltet ist, und einem Inkrementalgeber bzw. Winkelcodierer 17 gesteuert. Der Winkelcodierer ist vorzugsweise ein Absolutwertgeber, der auch nach Energieausfall die Bestimmung der aktuellen Schwenkhebel-Position erlaubt. Eine zentrale Steuereinheit steuert den Motor 15 in bezug auf den Schwenkweg bzw. den Schwenkwinkel, die Schwenkbewegung, die beispielsweise linear, progressiv, degressiv oder ähnlich verlaufen kann, und die Steuerpositionen, insbesondere den Beginn und das Ende der Schwenkbewegung, nach vorher eingegebenen Parametern. Durch die ausgelesenen Impulse des Inkrementalgebers oder Winkelcodierers 17 wird die erreichte Position ggf. im Sinne eines Regelkreises rückgemeldet. An der Anzeige- und Eingabeoberfläche 19 werden die Steuerdaten und Parameter angezeigt; dort können auch neue Parameter für die Steuereinheit 18 eingegeben werden.1 shows that the frame 11 is positioned and clamped on an inner tool or, as shown in the present case, on two inner tools 12 inserted on both sides. The inner tools 12 can be rotated about their longitudinal axis. The inner tools 12 are opposed by an outer tool 13 in the form of a tool roll, which is fixedly but rotatably mounted on a swivel lever 14. This pivot lever 14 is controlled by an actuator, consisting of a motor 15, upstream of which a reduction gear 16 is connected, and an incremental encoder or angle encoder 17. The angle encoder is preferably an absolute encoder, which allows the current swivel lever position to be determined even after a power failure. A central control unit controls the motor 15 with respect to the swivel path or the swivel angle, the swivel movement, which can for example be linear, progressive, degressive or similar, and the control positions, in particular the start and the end of the swivel movement, according to previously entered parameters. The read position of the incremental encoder or encoder 17, the position reached may be reported back in the form of a control loop. On the control data and parameters are displayed on the display and input surface 19; new parameters for the control unit 18 can also be entered there.
Fig. 2 zeigt die Anordnung der Stellantriebe und Schwenkhebel an einer Mehrspindel-Rotationsmaschine mit acht Innenwerkzeugen 12 und jedem dieser Innenwerkzeuge zugeordnete Außen-Formwerkzeuge 13, die jeweils auf einem Schwenkhebel 14 gelagert sind. Jedes Formwerkzeug 13 kann einen Schwenkweg S beschreiben, wobei dieses Werkzeug durch den Stellmotor 15, 16, 17 zum Innenwerkzeug 12 hin- und weggesteuert wird. Jeder einzelne der n-mal vorkommenden Stellantriebe (siehe Steuereinheit 18) ist unabhängig von jedem anderen steuerbar. Im Zentrum der Maschine befindet sich ein Kalibrierring 10, der nach jedem Wechsel der Werkzeugrollen 13 zur automatischen Referenzpunktermittlung aller Werkzeuge dient, in dem jeder Schwenkhebel 14 in die gleiche Richtung verstellt wird, bis die Werkzeugrolle den Kalibrierring berührt und der Winkelcodierer 7 jeder Schwenkachse auf "0" gesetzt wird.2 shows the arrangement of the actuators and swivel levers on a multi-spindle rotary machine with eight inner tools 12 and outer shaping tools 13 assigned to each of these inner tools, each of which is mounted on a swivel lever 14. Each molding tool 13 can describe a swivel path S, this tool being controlled to and from the inner tool 12 by the servomotor 15, 16, 17. Each of the actuators occurring n times (see control unit 18) can be controlled independently of any other. In the center of the machine there is a calibration ring 10, which is used for the automatic determination of the reference point for all tools after each change of the tool rollers 13, in which each pivot lever 14 is adjusted in the same direction until the tool roller touches the calibration ring and the angle encoder 7 on each pivot axis 0 "is set.
Fig. 3 zeigt eine Abwandlung der Mehrspindel-Rotationsmaschine nach Fig. 2 für einen zweistufigen Umformprozess. Auf jedem Schwenkhebel 14 sind endseitig äußere Werkzeugrollen 13a und 13b als Formwerkzeuge angeordnet, die unterschiedliche Profile besitzen. Die Schwenkhebel 14 sind über den Stellmotor 15, 16, 17 steuerbar. In der Position a ist die neutrale Mittelstellung (O-Stellung) dargestellt, bei der beide äußeren Werkzeugrollen 13a und 13b im Abstand zu einem Innenwerkzeug 12 mit aufgespannter Dosenzarge stehen. Nach Durchlaufen des Schwenkweges S1 (siehe Positionen b bis d) kommt die äußere Werkzeugrolle 13a mit der auf dem Innenwerkzeug 12 aufgespannten Dosenzarge in Eingriff. Nach erfolgter Bearbeitung wird der Schwenkhebel 14 über die O-Stellung (siehe Position e hinweg und unter Durchlaufen des Schwenkweges S2 in die Lage nach Position f geführt, in der die zweite äußere Werkzeugrolle 13b zum innenrotierenden Werkzeug 12 bzw. der dort aufgespannten Zarge in Eingriff kommt. Das Verhältnis der Steuerzeiten für den Beginn und das Ende des jeweiligen Schwenkweges S1 und S2 ist frei wählbar. Die zyklische Gesamtbewegung eines jeden Schwenkhebels setzt sich aus in unterschiedlichen Richtungen ablaufenden Bewegungsabschnitten zusammen. In einem ersten Abschnitt, d.h. bei Schwenkung um den Betrag S1 , wird die Werkzeugrolle 13a von der neutralen Mittelstellung unmittelbar in die Arbeitsposition gebracht. Im nachfolgenden zweiten Abschnitt wird anschließend eine weitere Umform- oder eine Falzoperation durch Schwenkung um den Betrag S2 ausgeführt. Mit der in Fig. 3 dargestellten Vorrichtung lassen sich auch Dosen mit unterschiedlichen Durchmessern ohne einen Wechsel von Werkzeugteilen bearbeiten. FIG. 3 shows a modification of the multi-spindle rotary machine according to FIG. 2 for a two-stage forming process. On each swivel lever 14, outer tool rolls 13a and 13b are arranged at the end as molding tools which have different profiles. The pivot levers 14 can be controlled via the servo motor 15, 16, 17. In position a, the neutral center position (O position) is shown, in which the two outer tool rollers 13a and 13b are at a distance from an inner tool 12 with the can frame clamped on. After passing through the swivel path S1 (see positions b to d), the outer tool roll 13a comes into engagement with the can frame clamped on the inner tool 12. After machining has been carried out, the swivel lever 14 is moved beyond the O position (see position e and while passing through the swivel path S2 into the position to position f) in which the second outer tool roller 13b engages with the internally rotating tool 12 or the frame which is clamped there The ratio of the control times for the beginning and the end of the respective swivel path S1 and S2 can be freely selected. The cyclical total movement of each swivel lever sets are made up of movement sections running in different directions. In a first section, ie when swiveling by the amount S1, the tool roller 13a is brought directly from the neutral central position into the working position. In the subsequent second section, a further forming or folding operation is then carried out by pivoting by the amount S2. With the device shown in FIG. 3, cans with different diameters can also be processed without changing tool parts.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
10 Kalibrierring10 calibration ring
11 Dosenzarge11 can frame
12 lnnenwerkzeug(e)12 inner tool (s)
13 Außenwerkzeug13 outer tool
14 Schwenkhebel14 swivel levers
15 Motor15 engine
16 Untersetzungsgetriebe16 reduction gears
17 Winkelcodierer17 encoders
18 Steuereinheit18 control unit
19 Anzeige- und Eingabeoberfläche 19 Display and input interface

Claims

Ansprüche Expectations
1. Vorrichtung zum Umformen und/oder Falzen von Dosenzarge (11) mittels mindestens zwei gegenläufig rotierenden Formwerkzeugen (12, 13), von denen eines auf einem Hebel (14) radial zustellbar angeordnet ist, d a d u r c h g e k e n n z e i c h n e t, dass der Hebel (14) mit einem steuerbaren Stellantrieb (15, 16, 17), bestehend aus einem Motor (15) mit oder ohne Untersetzungsgetriebe (16) und einen Inkrementalgeber oder Winkelcodierer (17).1. Device for reshaping and / or folding can frame (11) by means of at least two counter-rotating molds (12, 13), one of which is arranged on a lever (14) in a radially adjustable manner, characterized in that the lever (14) with a controllable actuator (15, 16, 17), consisting of a motor (15) with or without a reduction gear (16) and an incremental encoder or angle encoder (17).
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass der Hebel (14) als Schwenkhebel ausgebildet ist.2. Device according to claim 1, characterized in that the lever (14) is designed as a pivot lever.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass jeder Schwenkhebel (14) zwei Werkzeuge (13a, 13b) trägt, die abwechselnd als Formwerkzeuge verschwenkbar sind.3. Device according to claim 2, characterized in that each pivot lever (14) carries two tools (13a, 13b) which can be pivoted alternately as molding tools.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, gekennzeichnet durch einen Kalibrierkörper (10), insbesondere Kalibrierring, der nach einem Formwerkzeugwechsel als Referenzpunkt zum Nullpunktsabgleich des Inkrementalgebers oder Winkelcodierers (17) dient.4. Device according to one of claims 1 to 3, characterized by a calibration body (10), in particular calibration ring, which serves as a reference point for zero point adjustment of the incremental encoder or angle encoder (17) after a mold change.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass in einer Mehrspindel-Rotationsmaschine jeder Hebel (14) mit einem individuellen, von außen steuerbaren Stellantrieb (15, 16, 17) verbunden ist.5. Device according to one of claims 1 to 4, characterized in that in a multi-spindle rotary machine each lever (14) with an individual, externally controllable actuator (15, 16, 17) is connected.
6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass der Ist-Stromverlauf des elektrischen Stellantriebes in Relation zu dem Drehwinkel dieses Stellantriebes erfassbar und der daraus ermittelbare Kraftverlauf mit einem gespeicherten Kraftverlauf vergleichbar ist, wobei bei Überschreiten einer zulässigen Abweichung die Dosenzarge aussortiert wird. Vorrichtung nach einem der Ansprüche 1 bis 6, gekennzeichnet durch einen Speicher für die Kraftverläufe von typischen Fehlerursachen. 6. Device according to one of claims 1 to 5, characterized in that the actual current profile of the electric actuator in relation to the angle of rotation of this actuator can be detected and the force profile which can be determined therefrom is comparable to a stored force profile, the box frame being exceeded when an admissible deviation is exceeded is sorted out. Device according to one of claims 1 to 6, characterized by a memory for the force profiles of typical causes of errors.
EP03714646A 2002-03-01 2003-02-20 Device for reshaping and/or folding bodies of cans Expired - Lifetime EP1480768B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330228T SI1480768T1 (en) 2002-03-01 2003-02-20 Device for reshaping and/or folding bodies of cans

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10209154 2002-03-01
DE10209154A DE10209154A1 (en) 2002-03-01 2002-03-01 Device for forming and / or folding can bodies
PCT/DE2003/000528 WO2003074208A1 (en) 2002-03-01 2003-02-20 Device for reshaping and/or folding bodies of cans

Publications (2)

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EP1480768A1 true EP1480768A1 (en) 2004-12-01
EP1480768B1 EP1480768B1 (en) 2006-01-18

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ID=27740588

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EP03714646A Expired - Lifetime EP1480768B1 (en) 2002-03-01 2003-02-20 Device for reshaping and/or folding bodies of cans

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US (1) US7100411B2 (en)
EP (1) EP1480768B1 (en)
JP (1) JP4686127B2 (en)
AT (1) ATE315971T1 (en)
BR (1) BR0303326B1 (en)
DE (2) DE10209154A1 (en)
ES (1) ES2257663T3 (en)
TW (1) TWI268818B (en)
WO (1) WO2003074208A1 (en)

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BR0303326B1 (en) 2011-03-09
JP4686127B2 (en) 2011-05-18
JP2005518944A (en) 2005-06-30
ATE315971T1 (en) 2006-02-15
EP1480768B1 (en) 2006-01-18
US20050103076A1 (en) 2005-05-19
ES2257663T3 (en) 2006-08-01
US7100411B2 (en) 2006-09-05
DE50302236D1 (en) 2006-04-06
TWI268818B (en) 2006-12-21
WO2003074208A1 (en) 2003-09-12
BR0303326A (en) 2004-03-30
DE10209154A1 (en) 2003-09-11
TW200303799A (en) 2003-09-16

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