EP0390828B1 - Device for shaping a rotationally symmetrical sheet metal object, for example a pulley blank - Google Patents

Device for shaping a rotationally symmetrical sheet metal object, for example a pulley blank Download PDF

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Publication number
EP0390828B1
EP0390828B1 EP89900228A EP89900228A EP0390828B1 EP 0390828 B1 EP0390828 B1 EP 0390828B1 EP 89900228 A EP89900228 A EP 89900228A EP 89900228 A EP89900228 A EP 89900228A EP 0390828 B1 EP0390828 B1 EP 0390828B1
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EP
European Patent Office
Prior art keywords
sheet metal
metal body
inner cylinder
support
brake
Prior art date
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Expired - Lifetime
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EP89900228A
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German (de)
French (fr)
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EP0390828A1 (en
Inventor
K. Gerd Friedrichs
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FORMATECHNIK METALL- UND KUNSTSTOFFTEILE GMBH & CO
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Formatechnik Metall- und Kunststoffteile & Co Betriebs-Kg GmbH
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Application filed by Formatechnik Metall- und Kunststoffteile & Co Betriebs-Kg GmbH filed Critical Formatechnik Metall- und Kunststoffteile & Co Betriebs-Kg GmbH
Priority to AT89900228T priority Critical patent/ATE68381T1/en
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    • 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
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/02—Making articles shaped as bodies of revolution discs; disc wheels
    • B21H1/04—Making articles shaped as bodies of revolution discs; disc wheels with rim, e.g. railways wheels or pulleys
    • 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
    • B21D53/00—Making other particular articles
    • B21D53/26—Making other particular articles wheels or the like
    • B21D53/261—Making other particular articles wheels or the like pulleys

Definitions

  • the invention relates to a device for reshaping a rotationally symmetrical sheet metal body. Attention is drawn to EP-A-0319979, which relates to the same invention as described here, but relates to other contracting states.
  • a device according to the aforementioned type is known from FR-A-2116373.
  • Sheet metal bodies with a central sheet metal body axis, which has an outer surface coaxial to the sheet metal body axis with an U-shaped cross section open to the outside often serve as a blank for the production of belt pulleys.
  • a tin pot is first pressed out of a sheet metal disc, the outer surface of which initially corresponds to a smooth cylinder jacket. Then a U-shaped profile open to the outside is rolled into the cylinder jacket, in which the desired profile is embossed in a further manufacturing step.
  • the sheet metal body is clamped rotatably and acted upon by a rotatably mounted, disk-shaped tool, the tool and the sheet metal body rolling onto one another.
  • the width of the tool is dimensioned such that it comes between the two U-legs when the feed is transverse to the sheet metal body axis.
  • the desired profile depth is obtained by several complete revolutions of the sheet metal body with simultaneous tool feed.
  • the sheet metal body If the sheet metal body is subjected to radial pressure with the tool, the sheet metal tends to bear this pressure to avoid by forming a backwater in front of the point of intervention. This can lead to runout inaccuracies that must be corrected again.
  • the back pressure is dependent on the size of the opening angle between the end faces of the sheet metal body and the tool. The larger the opening angle, the greater the back pressure. Due to the frontal engagement, the opening angle cannot be reduced in the desired manner due to the design.
  • the invention has for its object to provide a device of the type mentioned, with which a reduction in the opening angle can be achieved.
  • the invention has the advantage that the associated opening angle can be optimally reduced by the engagement of an inner and an outer cylinder.
  • Another particularly great advantage can be seen in the fact that the sheet metal body can be arranged in a rotationally fixed manner, since the tool circles around the workpiece during the stamping process.
  • the relatively complex rotatable mounting of the workpiece can therefore be dispensed with.
  • the workpiece had to be arranged on the free end of a shaft, or two shaft ends, which are mutually under axial prestress, whereby a deflection of the shaft end during the side pressure application by the tool could not be ruled out.
  • a rotatable counter bearing had to be provided for the cavity of the sheet metal body will.
  • the entire device is simplified in that there is no need to have a separate workpiece drive and no synchronization with the tool drive.
  • the rotationally fixed mounting of the workpiece also facilitates the attachment and operation of a cooling device, so that the heat occurring during the deformation can be dissipated from the workpiece in a simple manner.
  • the invention takes advantage of the idea that the tool feed and the retraction of the tool between the two U-legs of the sheet metal body or the opposite movement can be carried out by a relative movement between the inner eccentric and the carrier which can be controlled in a simple manner.
  • a preferred development of the invention is that it is provided with an interchangeable chuck for receiving different tool rings. This has the advantage that the changeover to different sheet metal diameters or poly-V profiles can be carried out in a simple manner and in a short time.
  • the interchangeable chuck can therefore be provided with different tool inner rings.
  • the inner eccentric and the carrier are resiliently biased against a relative movement. This optionally ensures that the inner eccentric is returned to the working position in which it is in engagement with the sheet metal body, or to a release position in which the device can be fitted.
  • a preferred arrangement can be seen in that the inner eccentric is held in the starting position by the spring, and that one against the Spring force acting brake acting on the inner eccentric is present. If the brake is actuated, the desired deflection of the inner eccentric relative to the outer eccentric takes place. It is therefore a force-controlled system which can be implemented and operated in a simple manner.
  • the control of the device is further simplified in that the brake with a limit switch. This has the advantage that the brake releases when a predetermined deflection or a predetermined tool feed is reached and the inner eccentric is returned to the starting position due to its preload.
  • a particularly effective and simple implementation of the brake is that it is designed as an eddy current brake.
  • the brake can also be expedient for the brake to be designed as a mechanical brake, preferably as a shoe brake.
  • Fig. 1 shows schematically a cross section through a detail of the device in the starting position.
  • Fig. 2 shows schematically a cross section through the detail of FIG. 1 in a working position.
  • Fig. 3 shows schematically a side view of the detail in the working position.
  • Fig. 4 shows schematically a view of the device in the starting position
  • FIG. 5 schematically shows a view of the device according to FIG. 4 in the working position.
  • a pot-shaped sheet metal body 1 which is arranged in a rotationally fixed manner overall, is illustrated, which serves as a blank for a drive wheel, for example a poly-V pulley. It has a disk part 3 arranged concentrically to a sheet metal body axis 2, on the outer circumference of which a cylindrical jacket is arranged which is coaxial with the sheet metal body axis 2 and which has a U-shaped cross section open to the outside.
  • the two U-legs 5 serve as lateral boundaries of a tread 6, which is formed by the cylinder jacket part connecting the two U-legs 5.
  • a tool designed as an inner cylinder 7 with the corresponding negative poly-V profile is rotatably arranged around the sheet metal body 1.
  • 1 shows a starting position in which the inner cylinder 7 is located outside the U-leg 5. It is clear that the sheet metal body 1 can be brought into the inner cylinder 7 unhindered in this starting position.
  • Fig. 2 illustrates a working position in which the inner cylinder 7 is radially offset from the starting position in such a way that it is located on one side of the sheet metal body 1 between the U-legs 5, so that the poly-V profile 8 with the tread 6 comes into engagement.
  • the longitudinal axis 9 of the inner cylinder 7 comes to lie alongside the sheet-metal body axis, ie the inner cylinder 7 rotates eccentrically around the sheet-metal body 1 during a rotation. In this way, the inner cylinder 7 rolls on the sheet-metal body 1 with an expression of one Poly-V profile on the tread 6.
  • an interchangeable chuck 12 is also shown as an example, which receives the inner cylinder 7, which is designed as a circular ring.
  • the interchangeable chuck 12 allows the inner cylinder to be exchanged if a change in the profile or the inner diameter is desired.
  • the interchangeable chuck 12 is part of a carrier designed as a disk 14, which is described in connection with FIGS. 4 and 5.
  • the working position is shown in a side view.
  • the U-legs 5 are cut away in the area of the point of engagement of the inner cylinder 7 with the tread 6.
  • An opening angle between the running surface 6 of the sheet metal body 1 and the inner cylinder 7 is provided with the reference number 10. It is clear that the opening angle 10 becomes smaller the more the radii of the inner cylinder 7 and the tread 7 adapt. It can also be seen that the minimum radius of the inner cylinder 7 is determined by the outer radius of the U-legs 5.
  • FIGS. 4 and 5 illustrate how the inner cylinder 7 is driven and a radial feed is applied.
  • the inner cylinder 7 is located on an inner eccentric 11 eccentrically to its axis of rotation 15, via which it is rotatably mounted on the disk 14.
  • the slide 14 is arranged rotatably about the sheet metal body axis 2.
  • the axis of rotation 15 of the inner eccentric 11 is offset from the sheet metal body axis 2.
  • the inner eccentric 11 In the starting position shown, the inner eccentric 11 is rotated so that the inner cylinder 7 releases the sheet metal body 1 in the axial direction.
  • the angular position in this initial position is determined by a stop 17.
  • the inner eccentric 11 is held in this position with respect to the disk 14 by means of a spring 18.
  • a spring 18 When the disk 14 rotates, its axis of rotation 15 moves on a circular path 20 about the sheet metal body axis 2.
  • the inner cylinder 7 comes into engagement with the sheet metal body 1, as illustrated in FIG. 5.
  • the longitudinal axis 9 of the inner cylinder 7 rotates on a circular path 13 coaxially to the sheet metal body axis 2.
  • the inner cylinder 11 rolls on the fixed sheet metal body 1.
  • the maximum rotation of the inner eccentric 11 relative to the disk 14 is determined by a further stop 21.
  • the angular rotation of the inner eccentric 11 with respect to the disk 14 is achieved by a brake acting on the inner eccentric 11, which is designed such that it acts on the inner eccentric 11 regardless of the position and exerts a torque.
  • a brake acting on the inner eccentric 11 which is designed such that it acts on the inner eccentric 11 regardless of the position and exerts a torque.
  • it can be designed as a flying shoe brake. With a view to a clear representation, it is not shown in the figures. If a torque is exerted in the clockwise direction on the inner eccentric 11 of a rotation of the disk 14 counterclockwise, then this executes a rotation about its axis of rotation 15 according to arrow 16, whereby it is deflected against the spring force until further deflection by the further stop 21 is prevented.
  • the disk 14 is driven by a cylindrical worm 23, the toothing of which engages with a corresponding toothing on the cylindrical end face of the disk 14.
  • the desired inner cylinder 7 is rotatably attached to the inner eccentric 11 with the help of the changeable chuck 12.
  • the disk 14 is driven by the worm 23 and set in rotation in the sheet metal body axis 2.
  • the inner eccentric 11 bears against the stop 17, it rotates eccentrically around the sheet metal body 1 without the inner cylinder 7 touching the sheet metal body 1.
  • the inner cylinder 7 is displaced by a deflection of the inner eccentric 11 on a circular path lying outside, so that the poly-V profile 8 comes into engagement with the tread 6. Due to the rotary bearing of the inner cylinder 11, there is no relative movement between the inner cylinder 11 and the running surface 6. The larger the circular path traversed by the inner cylinder 7 becomes, the deeper the poly-V profile 8 is embossed into the tread 6. If the eccentric 11 reaches the further stop 21, a limit switch (not shown) is actuated, which releases the brake. As a result, the inner eccentric is returned to the starting position by the spring 18 and the sheet metal body 1 can be removed from the device.
  • the invention is defined by the independent claims and not only limited to such a blank shape. It is also possible to produce a pot from a disc-shaped blank (not shown) by means of an inner cylinder tool, the inner cylinder tool having an essentially semicircular hollow profile instead of the poly-V profile shown in FIG. 1. Analogously, further processing such as upsetting, splitting, drawing in, polishing and the like can also be carried out. be carried out using appropriate tools.
  • the inner eccentric can also be designed as a lever arm which is articulated on the disk 14 so as to be angularly displaceable.
  • the inner eccentric prefferably be designed as a slide which is arranged on the disk 14 so as to be radially displaceable on a straight path.

Abstract

The invention concerns a device for shaping a pulley blank, in particular for making poly-V profiles. A sheet metal object is surrounded by an annular tool (7) mounted eccentrically on an inner cam located on an outer cam (14). The outer cam (14) rotates coaxially about the central axis of the sheet metal object (1). The annular tool is moved radially outward by a movement of the inner cam relative to the outer cam, and engages with the sheet metal object, on which it unwinds while executing an eccentric rotatory movement around it.

Description

Die Erfindung betrifft eine Vorrichtung nach dem Obergriff des Anspruchs 1 bzw. dem Obergriff des Anspruch 12 zum Umformen eines rotationssysmmetrischen Blechkörpers. Es wird an dieser Stelle auf die EP-A-0319979 hingewiesen, die dieselben Erfindung zum Gegenstand hat, wie hier beschrieben wird, jedoch andere Vertragsstaaten betrifft. Eine Vorrichtung gemäß der vorgenannten Gattung ist aus der FR-A-2116373 bekannt geworden. Blechkörper mit einer zentrischen Blechkörperachse, der eine zur Blechkörperachse koaxiale Außenfläche mit einem nach außen offenen U-förmigen Querschnitt aufweist, dienen häuflig als Rohling zur Herstellung von Riemenscheiben. Dabei wird als erster Herstellungsschritt zunächst aus einer Blechscheibe ein Blechtopf gepreßt, dessen Außenfläche zunächst einem glatten Zylindermantel entspricht. Anschließend wird in den Zylindermantel ein nach außen offenes U-förmiges Profil gerollt, in welchem in einem weiteren Herstellungsschritt das gewünschte Profil eingeprägt ist.The invention relates to a device for reshaping a rotationally symmetrical sheet metal body. Attention is drawn to EP-A-0319979, which relates to the same invention as described here, but relates to other contracting states. A device according to the aforementioned type is known from FR-A-2116373. Sheet metal bodies with a central sheet metal body axis, which has an outer surface coaxial to the sheet metal body axis with an U-shaped cross section open to the outside, often serve as a blank for the production of belt pulleys. As a first manufacturing step, a tin pot is first pressed out of a sheet metal disc, the outer surface of which initially corresponds to a smooth cylinder jacket. Then a U-shaped profile open to the outside is rolled into the cylinder jacket, in which the desired profile is embossed in a further manufacturing step.

Hierfür wird der Blechkörper drehbar eingespannt und mit einem drehbar gelagerten, scheibenförmigen Werkzeug beaufschlagt, wobei das Werkzeug und der Blechkörper aufeinander abrollen. Die Breite des Werkzeugs ist so bemessen, daß es bei einem quer zur Blechkörperachse verlaufenden Vorschub zwischen die beiden U-Schenkel gelangt. Durch mehrere vollständige Umdrehungen des Blechkörpers unter gleichzeitigem Werkzeugvorschuberhält man die gewünschte Profiltiefe.For this purpose, the sheet metal body is clamped rotatably and acted upon by a rotatably mounted, disk-shaped tool, the tool and the sheet metal body rolling onto one another. The width of the tool is dimensioned such that it comes between the two U-legs when the feed is transverse to the sheet metal body axis. The desired profile depth is obtained by several complete revolutions of the sheet metal body with simultaneous tool feed.

Wird der Blechkörper dabei mit dem Werkzeug mit radialem Druck beaufschlagt, so neigt das Blech dazu, diesem Druck auszuweichen, indem es vor dem Eingriffspunkt einen Rückstau bildet. Dies kann zu Rundlauf-Ungenauigkeiten führen, die wieder korrigiert werden müssen. Der Rückstau ist abhängig von der Größe des Öffnungswinkels zwischen den Stirnseiten des Blechkörpers und des Werkzeugs. Je größer der Öffnungwinkel ist, desto größer ist der Rückstau. Aufgrund des stirnseitigen Eingriffs kann der Öffnungswinkel jedoch konstruktionsbedingt nicht in der gewünschten Weise verkleinert werden.If the sheet metal body is subjected to radial pressure with the tool, the sheet metal tends to bear this pressure to avoid by forming a backwater in front of the point of intervention. This can lead to runout inaccuracies that must be corrected again. The back pressure is dependent on the size of the opening angle between the end faces of the sheet metal body and the tool. The larger the opening angle, the greater the back pressure. Due to the frontal engagement, the opening angle cannot be reduced in the desired manner due to the design.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung der eingangs genannten Art anzugeben, mit welche eine Verkleinerung des Öffnungswinkels erreicht werden kann.The invention has for its object to provide a device of the type mentioned, with which a reduction in the opening angle can be achieved.

Diese Aufgabe wird durch die Merhmale des Anspruch 1 bzw. des Anspruchs 12 gelöst.This object is achieved by the features of claim 1 and claim 12.

Die Erfindung hat den Vorteil, daß durch den Eingriff eines Innen- und eines Außenzylinders der zugehörige Öffnungswinkel optimal verkleinert werden kann. Ein weiterer besonders großer Vorteil ist darin zu sehen, daß der Blechkörper drehfest angeordnet werden kann, da das Werkzeug während des Prägevorgangs um das Werkstückt kreist. Es kann daher die relativ aufwendige drehbare Lagerung des Werkstücks entfallen. Bei einigen bekannten Verfahren mußte beispielsweise des Werkstück auf dem freien Ende einer Welle, bzw. zweier Wellenenden, die gegenseitig unter axialer Vorspannung stehen, angeordnet sein, wobei ein Ausweichen des Wellenendes bei der seitlichen Druckbeaufschalgung durch das Werkzeug nicht ausgeschlossen werden konnte. Ebenso mußte ein drehbares Gegenlager für den Hohlraum des Blechkörpers vorgesehen werden. Nicht zuletzt wird die gesamte Vorrichtung dadurch vereinfacht, daß kein eigener Werkstück-Antrieb und keine Synchronisation mit dem Werkzeugantrieb vorhanden zu sein braucht. Durch die drehfeste Lagerung des Werkstücks wird auch das Anbringen und Betreiben einer Kühlvorrichtung erleichtert, so daß die bei der Verformung auftretende Hitze auf einfache Weise vom Werkstück abgeführt werden kann.The invention has the advantage that the associated opening angle can be optimally reduced by the engagement of an inner and an outer cylinder. Another particularly great advantage can be seen in the fact that the sheet metal body can be arranged in a rotationally fixed manner, since the tool circles around the workpiece during the stamping process. The relatively complex rotatable mounting of the workpiece can therefore be dispensed with. In some known methods, for example, the workpiece had to be arranged on the free end of a shaft, or two shaft ends, which are mutually under axial prestress, whereby a deflection of the shaft end during the side pressure application by the tool could not be ruled out. Likewise, a rotatable counter bearing had to be provided for the cavity of the sheet metal body will. Last but not least, the entire device is simplified in that there is no need to have a separate workpiece drive and no synchronization with the tool drive. The rotationally fixed mounting of the workpiece also facilitates the attachment and operation of a cooling device, so that the heat occurring during the deformation can be dissipated from the workpiece in a simple manner.

Die Erfindung macht sich den Gedanken zunutze, daß der Werkzeugvorschub und das Einfahren des Werkzeugs zwischen die beiden U-Schenkel des Blechkörpers bzw. die entgegengesetzte Bewegung durch eine auf einfache Weise steuerbare Relativbewegung zwischen dem Innenexzenter und dem Träger erfolgen kann.The invention takes advantage of the idea that the tool feed and the retraction of the tool between the two U-legs of the sheet metal body or the opposite movement can be carried out by a relative movement between the inner eccentric and the carrier which can be controlled in a simple manner.

Eine bevorzugte Weiterbildung der Erfindung besteht darin, daß sie mit einem Wechselfutter zur Aufnahme unterschiedlicher Werkzeugringe versehen ist. Das hat den Vorteil, daß die Umrüstung auf unterschiedliche Blechkörper-Durchmesser oder Poly-V-Profile auf einfache Weise und in kurzer Zeit vorgenommen werden kann. Das Wechselfutter kann also wahlweise mit unterschiedlichen Werkzeug-Innenringen versehen werden.A preferred development of the invention is that it is provided with an interchangeable chuck for receiving different tool rings. This has the advantage that the changeover to different sheet metal diameters or poly-V profiles can be carried out in a simple manner and in a short time. The interchangeable chuck can therefore be provided with different tool inner rings.

Eine andere bevorzugte Weiterbildung der Erfindung besteht darin, daß der Innenexzenter und der Träger gegen eine Relativbewegung federnd vorgespannt sind. Somit wird wahlweise sichergestellt, daß der Innenexzenter in die Arbeitsstellung, in welcher er mit dem Blechkörper in Eingriff steht, oder in eine Freigabestellung, in welcher die Vorrichtung bestückt werden kann, zurückgestellt wird.Another preferred development of the invention is that the inner eccentric and the carrier are resiliently biased against a relative movement. This optionally ensures that the inner eccentric is returned to the working position in which it is in engagement with the sheet metal body, or to a release position in which the device can be fitted.

Eine bevorzugte Anordnung ist darin zu sehen, daß der Innenexzenter durch die Feder in der Ausgangsposition gehalten ist, und daß eine entgegen der Federkraft wirkende, den Innenexzenter beaufschlagende Bremse vorhanden ist. Wird die Bremse betätigt, so erfolgt die gewünschte Auslenkung des Innenexzenters gegenüber dem Außenexzenter. Es handelt sich also um ein kraftgesteuertes System, welches auf einfache Weise realisierbar und betreibbar ist.A preferred arrangement can be seen in that the inner eccentric is held in the starting position by the spring, and that one against the Spring force acting brake acting on the inner eccentric is present. If the brake is actuated, the desired deflection of the inner eccentric relative to the outer eccentric takes place. It is therefore a force-controlled system which can be implemented and operated in a simple manner.

Das Steuern der Vorrichtung wird dadurch weiter vereinfacht, daß die Bremse mit einem Endschalter Dies hat den Vorteil, daß die Bremse beim Erreichen einer vorgegebenen Auslenkung bzw. eines vorgegebenen Werkzeugvorschubs freigibt und der Innenexzenter aufgrund seiner Vorspannung in die Ausgangsposition zurückgeführt wird.The control of the device is further simplified in that the brake with a limit switch. This has the advantage that the brake releases when a predetermined deflection or a predetermined tool feed is reached and the inner eccentric is returned to the starting position due to its preload.

Eine besonders wirkungsvolle und einfache Realisierung der Bremse besteht darin, daß sie als Wirbelstrombremse ausgebildet ist.A particularly effective and simple implementation of the brake is that it is designed as an eddy current brake.

Alternativ dazu kann es auch zweckmäßig sein, daß die Bremse als mechanische Bremse, bevorzugt als Backenbremse, ausgebildet ist.As an alternative to this, it can also be expedient for the brake to be designed as a mechanical brake, preferably as a shoe brake.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels weiter beschrieben.The invention is described below with reference to an embodiment shown in the drawing.

Fig. 1 zeigt schematisch einen Querschnitt durch eine Einzelheit der Vorrichtung in der Ausgangsposition.Fig. 1 shows schematically a cross section through a detail of the device in the starting position.

Fig. 2 zeigt schematisch einen Querschnitt durch die Einzelheit gemäß Fig. 1 in einer Arbeitsposition.Fig. 2 shows schematically a cross section through the detail of FIG. 1 in a working position.

Fig. 3 zeigt schematisch eine Seitenansicht der Einzelheit in der Arbeitsposition.Fig. 3 shows schematically a side view of the detail in the working position.

Fig. 4 zeigt schematisch eine Ansicht der Vorrichtung in der Ausgangsposition undFig. 4 shows schematically a view of the device in the starting position and

Fig. 5 zeigt schematisch eine Ansicht der Vorrichtung gemäß Fig. 4 in der Arbeitsposition.FIG. 5 schematically shows a view of the device according to FIG. 4 in the working position.

In der Querschnittsdarstellung der Fig. 1 ist ein insgesamt drehfest angeordneter topfförmiger Blechkörper 1 veranschaulicht, der als Rohling für ein Antriebsrad, beispielsweise eine Poly-V-Riemenscheibe, dient. Er weist ein konzentrisch zu einer Blechkörperachse 2 angeordnetes Scheibenteil 3 auf, an dessen Außenumfang ein zur Blechkörperachse 2 koaxialer Zylindermantel angeordnet ist, welcher einen nach außen offenen U-förmigen Querschnitt aufweist. Die beiden U-Schenkel 5 dienen beim fertigen Antriebsrad als seitliche Begrenzungen einer Lauffläche 6, die von dem die beiden U-Schenkel 5 verbindenden Zylindermantel-Teil gebildet wird. Um den Blechkörper 1 ist ein als Innenzylinder 7 ausgebildetes Werkzeug mit dem entsprechenden negativen Poly-V-Profil drehbar angeordnet. Die Fig. 1 zeigt eine Ausgangsposition, in welcher sich der Innenzylinder 7 außerhalb der U-Schenkel 5 befindet. Es wird deutlich, daß der Blechkörper 1 in dieser Ausgangsposition ungehindert in den Innenzylinder 7 verbracht werden kann.In the cross-sectional view of FIG. 1, a pot-shaped sheet metal body 1, which is arranged in a rotationally fixed manner overall, is illustrated, which serves as a blank for a drive wheel, for example a poly-V pulley. It has a disk part 3 arranged concentrically to a sheet metal body axis 2, on the outer circumference of which a cylindrical jacket is arranged which is coaxial with the sheet metal body axis 2 and which has a U-shaped cross section open to the outside. In the finished drive wheel, the two U-legs 5 serve as lateral boundaries of a tread 6, which is formed by the cylinder jacket part connecting the two U-legs 5. A tool designed as an inner cylinder 7 with the corresponding negative poly-V profile is rotatably arranged around the sheet metal body 1. 1 shows a starting position in which the inner cylinder 7 is located outside the U-leg 5. It is clear that the sheet metal body 1 can be brought into the inner cylinder 7 unhindered in this starting position.

Die Fig. 2 veranschaulicht eine Arbeitsposition, in welcher der Innenzylinder 7 gegenüber der Ausgangsposition in der Weise radial versetzt ist, daß er sich an einer Seite des Blechkörpers 1 zwischen den U-Schenkeln 5 befindet, so daß das Poly-V-Profil 8 mit der Lauffläche 6 in Eingriff gelangt. Die Längsachse 9 des Innenzylinders 7 kommt dabeineben der Blechkörperachse zu liegen, d.h. der Innenzylinder 7 rotiert bei einer Drehung exzentrisch um den Blechkörper 1. Auf diese Weise rollt der Innenzylinder 7 auf dem Blechkörper 1 unter Ausprägung eines Poly-V-Profils auf der Lauffläche 6 ab.Fig. 2 illustrates a working position in which the inner cylinder 7 is radially offset from the starting position in such a way that it is located on one side of the sheet metal body 1 between the U-legs 5, so that the poly-V profile 8 with the tread 6 comes into engagement. The longitudinal axis 9 of the inner cylinder 7 comes to lie alongside the sheet-metal body axis, ie the inner cylinder 7 rotates eccentrically around the sheet-metal body 1 during a rotation. In this way, the inner cylinder 7 rolls on the sheet-metal body 1 with an expression of one Poly-V profile on the tread 6.

In der Fig. 2 ist ferner beispielhaft ein Wechselfutter 12 eingezeichnet, welches den als Kreisring ausgebildeten Innenzylinder 7 aufnimmt. Das Wechselfutter 12 gestattet einen Austausch des Innenzylinders, wenn eine Änderung des Profils oder des Innendurchmessers gewünscht wird. Das Wechselfutter 12 ist Bestandteil eines als Scheibe 14 ausgebildeten Trägers, der im Zusammenhang mit den Fig. 4 und 5 beschrieben ist.In FIG. 2, an interchangeable chuck 12 is also shown as an example, which receives the inner cylinder 7, which is designed as a circular ring. The interchangeable chuck 12 allows the inner cylinder to be exchanged if a change in the profile or the inner diameter is desired. The interchangeable chuck 12 is part of a carrier designed as a disk 14, which is described in connection with FIGS. 4 and 5.

In der Fig. 3 ist die Arbeitsposition in einer Seitenansicht gezeigt. Aus Gründen der Übersichtlichkeit sind die U-Schenkel 5 im Bereich der Eingriffsstelle des Innenzylinders 7 mit der Lauffläche 6 weggeschnitten. Ein Öffnungswinkel zwischen der Lauffläche 6 des Blechkörpers 1 und dem Innenzylinder 7 ist mit dem Bezugszeichen 10 versehen. Es wird deutlich, daß der Öffnungswinkel 10 umso kleiner wird, je mehr sich die Radien des Innenzylinders 7 und der Lauffläche 7 anpassen. Ferner ist auch ersichtlich, daß der minimale Radius des Innenzylinders 7 durch den Außenradius der U-Schenkel 5 bestimmt wird.3, the working position is shown in a side view. For reasons of clarity, the U-legs 5 are cut away in the area of the point of engagement of the inner cylinder 7 with the tread 6. An opening angle between the running surface 6 of the sheet metal body 1 and the inner cylinder 7 is provided with the reference number 10. It is clear that the opening angle 10 becomes smaller the more the radii of the inner cylinder 7 and the tread 7 adapt. It can also be seen that the minimum radius of the inner cylinder 7 is determined by the outer radius of the U-legs 5.

Die Ansichten gemäß Fig. 4 und 5 veranschaulichen, auf welche Weise der Innenzylinders 7 angetrieben und mit einem radialen Vorschub beaufschlagt wird. Der Innenzylinder 7 befindet sich auf einem Innenexzenter 11 exzentrisch zu dessen Drehachse 15, über welche er drehbar auf der Scheibe 14 gelagert ist. Die Schiebe 14 ist um die Blechkörperachse 2 drehbar angeordnet. Dagegen ist die Rotationsachse 15 des Innenexzenters 11 versetzt zur Blechkörperachse 2 angeordnet. Bei einer Drehung des Innenexzenters 11 bewegt sich der Innenzylinder 7 daher auf einer Kreisbahn.The views according to FIGS. 4 and 5 illustrate how the inner cylinder 7 is driven and a radial feed is applied. The inner cylinder 7 is located on an inner eccentric 11 eccentrically to its axis of rotation 15, via which it is rotatably mounted on the disk 14. The slide 14 is arranged rotatably about the sheet metal body axis 2. In contrast, the axis of rotation 15 of the inner eccentric 11 is offset from the sheet metal body axis 2. When the inner eccentric 11 rotates, the inner cylinder 7 therefore moves up a circular path.

In der dargestellten Ausgangspasition ist der Innenexzenter 11 so gedreht, daß der Innenzylinder 7 den Blechkörper 1 in axialer Richtung freigibt. Die Winkellage in dieser Ausgangspasition ist durch einen Anschlag 17 festgelegt.In the starting position shown, the inner eccentric 11 is rotated so that the inner cylinder 7 releases the sheet metal body 1 in the axial direction. The angular position in this initial position is determined by a stop 17.

Der Innenexzenter 11 ist gegenüber der Scheibe 14 mit Hilfe einer Feder 18 in dieser Stellung gehalten. Bei einer Drehung der Scheibe 14 bewegt sich ihre Rotationsachse 15 auf einer Kreisbahn 20 um die Blechkörperachse 2.The inner eccentric 11 is held in this position with respect to the disk 14 by means of a spring 18. When the disk 14 rotates, its axis of rotation 15 moves on a circular path 20 about the sheet metal body axis 2.

Wird hierbei der Innenexzenter 11 im Uhrzeigersinn gegen die Federbeaufschlagung gedreht, so gelangt der Innenzylinder 7 in Eingriff mit dem Blechkörper 1, wie in Fig. 5 verdeutlicht. Die Längsachse 9 des Innenzylinders 7 rotiert dabei auf einer Kreisbahn 13 koaxial zur Blechkörperachse 2. Wie im Zusammenhang mit Fig. 3 bereits erwähnt, rollt der Innenzylinder 11 dabei auf dem feststehenden Blechkörper 1 ab.If the inner eccentric 11 is rotated clockwise against the spring loading, the inner cylinder 7 comes into engagement with the sheet metal body 1, as illustrated in FIG. 5. The longitudinal axis 9 of the inner cylinder 7 rotates on a circular path 13 coaxially to the sheet metal body axis 2. As already mentioned in connection with FIG. 3, the inner cylinder 11 rolls on the fixed sheet metal body 1.

Die maximale Verdrehung des Innenexzenters 11 gegenüber der Scheibe 14 wird durch einen weiteren Anschlag 21 bestimmt.The maximum rotation of the inner eccentric 11 relative to the disk 14 is determined by a further stop 21.

Die Winkelverdrehung des Innenexzenters 11 bezüglich der Scheibe 14 wird durch eine auf den Innenexzenter 11 wirkende Bremse erreicht, die so ausgebildet ist, daß sie lageunabhängig auf den Innenexzenter 11 wirkt und ein Drehmoment ausübt. Sie kann beispielsweise als fliegende Backenbremse ausgebildet sein. Im Hinblick auf eine übersichtliche Darstellung ist sie in den Figuren nicht dargestellt. Wird auf den Innenexzenter 11 einer Drehung der Scheibe 14 entgegen dem Uhrzeigersinn ein Drehmoment im Uhrzeigersinn ausgeübt, so führt diese eine Drehung um ihre Rotationsachse 15 gemäß Pfeil 16 aus, wobei sie gegen dei Federkraft ausgelenkt wird, bis eine weitere Auslenkung durch den weiteren Anschlag 21 verhindert wird.The angular rotation of the inner eccentric 11 with respect to the disk 14 is achieved by a brake acting on the inner eccentric 11, which is designed such that it acts on the inner eccentric 11 regardless of the position and exerts a torque. For example, it can be designed as a flying shoe brake. With a view to a clear representation, it is not shown in the figures. If a torque is exerted in the clockwise direction on the inner eccentric 11 of a rotation of the disk 14 counterclockwise, then this executes a rotation about its axis of rotation 15 according to arrow 16, whereby it is deflected against the spring force until further deflection by the further stop 21 is prevented.

Die Scheibe 14 wird im dem dargestellten Beispiel über eine zylindrische Schnecke 23 angetrieben, deren Verzahnung in Eingriff mit einer entsprechenden Verzahnung auf der zylindrischen Stirnseite der Scheibe 14 steht.In the example shown, the disk 14 is driven by a cylindrical worm 23, the toothing of which engages with a corresponding toothing on the cylindrical end face of the disk 14.

Anhand der Figuren wird nachfolgend die Funktion der Vorrichtung beschrieben.
Zunächst wird in der Ausgangsposition der gewünschte Innenzylinder 7 mit Hilfe des Wechselfutters 12 am Innenexzenter 11 drehbar befestigt. Wenn der Blechkörper 11 in den Innenzylinder gebracht und dort gesichert ist, wird die Scheibe 14 über die Schnecke 23 angetrieben und in Rotation im die Blechkörperachse 2 versetzt. Solange dabei der Innenexzenter 11 am Anschlag 17 anliegt, rotiert er exzentrisch um den Blechkörper 1, ohne daß der Innenzylinder 7 den Blechkörper 1 berührt.The function of the device is described below with the aid of the figures.
First, in the starting position, the desired inner cylinder 7 is rotatably attached to the inner eccentric 11 with the help of the changeable chuck 12. When the sheet metal body 11 is brought into the inner cylinder and secured there, the disk 14 is driven by the worm 23 and set in rotation in the sheet metal body axis 2. As long as the inner eccentric 11 bears against the stop 17, it rotates eccentrically around the sheet metal body 1 without the inner cylinder 7 touching the sheet metal body 1.

Sobald die Bremse betätigt wird, wird der Innenzylinder 7 durch Auslenkung des Innenexzenters 11 auf eine wieter außen liegende Kreisbahn versetzt, so daß das Poly-V-Profil 8 mit der Lauffläche 6 in Eingriff gelangt. Aufgrund der Drehlagerung des Innenzylinders 11 erfolgt dabei keine Relativbewegung zwischen Innenzylinder 11 und Lauffläche 6.
Je größer die vom Innenzylinder 7 durchlaufen Kreisbahn wird, desto tiefer wird das Poly-V-Profil 8 in die Lauffläche 6 eingeprägt. Erreicht hierbei der Exzenter 11 den weiteren Anschlag 21, so wird ein Endschalter (nicht dargestellt) betätigt, welcher ein Lösen der Bremse bewirkt. Dadurch wird der Innenexzenter durch die Feder 18 wieder in die Ausgangsposition zurückgestellt und der Blechkörper 1 kann aus der Vorrichtung entnommen werden.As soon as the brake is actuated, the inner cylinder 7 is displaced by a deflection of the inner eccentric 11 on a circular path lying outside, so that the poly-V profile 8 comes into engagement with the tread 6. Due to the rotary bearing of the inner cylinder 11, there is no relative movement between the inner cylinder 11 and the running surface 6.
The larger the circular path traversed by the inner cylinder 7 becomes, the deeper the poly-V profile 8 is embossed into the tread 6. If the eccentric 11 reaches the further stop 21, a limit switch (not shown) is actuated, which releases the brake. As a result, the inner eccentric is returned to the starting position by the spring 18 and the sheet metal body 1 can be removed from the device.

In den Figuren sind zur Verdeutlichung der Funktion der Erfindung die Größenverhältnisse, insbesondere die exzentrischen Anordnungen, stark übertrieben dargestellt.In the figures, to clarify the function of the invention, the proportions, in particular the eccentric arrangements, are shown in a greatly exaggerated manner.

Wenngleich in der vorstehenden Beschreibung auf die Bearbeitung eines topfförmigen Rohlings Bezug genommen ist, ist die Erfindung durch die unabhängigen Ansprüche definiert und nicht nur auf eine derartige Rohlingform begrenzt. Es ist auch möglich, aus einem scheibenförmigen Rohling (nicht dargestellt) mittels eines Innenzylinder-Werkzeugs einen Topf herzustellen, wobei das Innenzylinder-Werkzeug anstelle des in Fig. 1 gezeigten Poly-V-Profils ein im wesentlichen halbkreisförmiges Hohlprofil aufweist. Sinngemäß können auch weitere Bearbeitungen wie Stauchen, Spalten, Einziehen, Polieren u.ä. mittels entsprechender Werkzeuge ausgeführt werden. Der Innenexzenter kann auch als Hebelarm ausgebildet sein, der winkelverschieblich an der Scheibe 14 angelenkt ist.Although reference has been made to the processing of a pot-shaped blank in the above description, the invention is defined by the independent claims and not only limited to such a blank shape. It is also possible to produce a pot from a disc-shaped blank (not shown) by means of an inner cylinder tool, the inner cylinder tool having an essentially semicircular hollow profile instead of the poly-V profile shown in FIG. 1. Analogously, further processing such as upsetting, splitting, drawing in, polishing and the like can also be carried out. be carried out using appropriate tools. The inner eccentric can also be designed as a lever arm which is articulated on the disk 14 so as to be angularly displaceable.

Alternativ dazu ist es auch zweckmäßig, daß der Innenexzenter als Schieber ausgebildet ist, der radial auf einer geraden Bahn verschiebbar auf der Scheibe 14 angeordnet ist.As an alternative to this, it is also expedient for the inner eccentric to be designed as a slide which is arranged on the disk 14 so as to be radially displaceable on a straight path.

Claims (12)

1. Device for shaping a rotationally symmetric sheet metal body (1) with a central sheet metal body axis (2) and with a rotationably arranged embossing die formed as an inner cylinder (7), whereby the embossing die is rolling over the outer surface of the sheet metal body (1), and with a rotation driving support, which is arranged coaxially to the sheet metal body axis and on which the rotation axis of the inner cylinder (7) is arranged eccentrically to the sheet metal body axis (2)
characterized in that
the inner cylinder (7) is formed for shaping a pulley blank,
that the inner cylinder (7) is further constructed on a support arranged eccentrically to the sheet metal body axis (2),
That the inner eccentric (11) is arranged with a center of rotation eccentrical to the sheet metal body axis (2) on the support, and
that there is an arrangement for rotating the inner eccentric (11) for a predetermined angle of rotation relativ to the support, so that the eccentricity of the inner eccentric (11) is changed with respect to the support.
2. Device according to claim 1,
characterized in that
the rotation of the inner cylinder (11) is limited by stops (17,21).
3. Device according to claim 1 or 2,
characterized in that
the inner eccentric (11) is constructed as a circular disk (14), which is pivoted in a circular bearing on the support.
4. Device according to one of the preceding claims,
characterized in that
the support is formed as a disk (14), which is driven by a cylindrical worm (23) on its outer circumference.
5. Device according to one of the preceding claims,
characterized in that
the internal eccentric (11) and the disk (14) are resiliently pretensioned against a relative movement.
6. Device according to claim 5,
characterized in that
the internal eccentric (11) is held in a starting position by the spring (18) and that there is a brake acting on the internal eccentric (11) and counter to spring tension.
7. Device according to claim 5,
characterized in that
a limit switch is provided, which releases the brake in the case of a predetermined deflection of the internal eccentric (11).
8. Device according to claims 6 or 7,
characterized in that
the brake is constructed as an eddy current brake.
9. Device according to claims 6 or 7,
characterized in that
the brake is constructed as a mechanical brake.
10. Device according to claim 9,
characterized in that
the brake is constructed as a block brake.
11. Device according to one of the preceding claims 1 to 8
characterized in that
the internal eccentric (11) is constructed as circular disk, which is mounted in a circular bearing on the disk (14).
12. Device for shaping a rotationally symmetric sheet metal body (1) with a central sheet metal body axis (2) and with a rotationably arranged embossing die formed as an inner cylinder (7), whereby the embossing die is rolling over the outer surface of the sheet metal body (1), and with a rotation driving support, which is arranged coaxially to the sheet metal body axis (2) and on which the rotation axis of the inner cylinder (7) is arranged eccentrically to the sheet metal body axis (2),
characterized in that
the inner cylinder (7) is formed for shaping a pulley blank,
that the inner cylinder (7) is further constructed as a slide, which is arranged on the support radially displaceable on a straight path, and
that there is a drive arrangement for the slide for a predetermined way with respect to the support, so that the eccentricity of the inner cylinder (7) is changed with respect to the support.
EP89900228A 1987-12-08 1988-12-07 Device for shaping a rotationally symmetrical sheet metal object, for example a pulley blank Expired - Lifetime EP0390828B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89900228T ATE68381T1 (en) 1987-12-08 1988-12-07 DEVICE FOR FORMING A ROTATIONALLY SYMMETRIC SHEET METAL BODY, FOR EXAMPLE A PULLEY BLANK.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3741596A DE3741596C3 (en) 1987-12-08 1987-12-08 Device for producing a profile on a rotationally symmetrical sheet metal blank
DE3741596 1987-12-08

Publications (2)

Publication Number Publication Date
EP0390828A1 EP0390828A1 (en) 1990-10-10
EP0390828B1 true EP0390828B1 (en) 1991-10-16

Family

ID=6342137

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89900228A Expired - Lifetime EP0390828B1 (en) 1987-12-08 1988-12-07 Device for shaping a rotationally symmetrical sheet metal object, for example a pulley blank
EP88120547A Expired - Lifetime EP0319979B1 (en) 1987-12-08 1988-12-08 Apparatus for working hollow sheet metal objects, e.g. a pulley blank

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP88120547A Expired - Lifetime EP0319979B1 (en) 1987-12-08 1988-12-08 Apparatus for working hollow sheet metal objects, e.g. a pulley blank

Country Status (6)

Country Link
EP (2) EP0390828B1 (en)
JP (1) JPH03502663A (en)
AT (1) ATE68381T1 (en)
DE (2) DE3741596C3 (en)
ES (1) ES2026988T3 (en)
WO (1) WO1989005203A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904241A1 (en) * 1989-02-13 1990-08-16 Tewig Gmbh DEVICE FOR MAKING A PROFILE ON A POT
DE3936200C1 (en) * 1989-10-31 1990-12-13 Leifeld Gmbh & Co, 4730 Ahlen, De

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE750476C (en) * 1940-07-17 1945-01-15 Boerdel and Sieken machine, especially for tin cans
DE2060024A1 (en) * 1970-12-05 1972-06-08 Kabel Metallwerke Ghh Process for the production of ring-shaped corrugated metal pipes
DE2732263A1 (en) * 1977-07-16 1979-02-01 Schuler Gmbh L DEVICE FOR CREATING A BORDER ON THE PERIOD OF A HOLLOW CYLINDER
JPS5912375B2 (en) * 1980-12-27 1984-03-22 合資会社金光銅工「鎔」接所 Manufacturing method of sheet metal poly V pulley
JPS58110146A (en) * 1981-12-24 1983-06-30 Kanemitsu Doukou Yousetsushiyo:Goushi Poly v-pulley made of sheet metal and its production

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 234 (M-507) (2270), 14. August 1986 & JP-A-6167523 (YAZAKI), 7. April 1983 *

Also Published As

Publication number Publication date
EP0390828A1 (en) 1990-10-10
DE3741596A1 (en) 1989-06-08
JPH03502663A (en) 1991-06-20
WO1989005203A1 (en) 1989-06-15
EP0319979A1 (en) 1989-06-14
ES2026988T3 (en) 1992-05-16
DE3741596C2 (en) 1991-01-10
DE3741596C3 (en) 1995-05-18
ATE68381T1 (en) 1991-11-15
EP0319979B1 (en) 1991-09-25
DE3865680D1 (en) 1991-11-21

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