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EP0812636A1 - Method and device for producing rotationally symmetrical workpieces, in particular vehicle wheels - Google Patents

Method and device for producing rotationally symmetrical workpieces, in particular vehicle wheels Download PDF

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Publication number
EP0812636A1
EP0812636A1 EP97109632A EP97109632A EP0812636A1 EP 0812636 A1 EP0812636 A1 EP 0812636A1 EP 97109632 A EP97109632 A EP 97109632A EP 97109632 A EP97109632 A EP 97109632A EP 0812636 A1 EP0812636 A1 EP 0812636A1
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EP
European Patent Office
Prior art keywords
pressure rollers
blank
tool
roller
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.)
Withdrawn
Application number
EP97109632A
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German (de)
French (fr)
Inventor
Dieter Prof. Dr.-Ing. Schmoeckel
Stefan Dipl.-Ing. Hauk
Paul Dipl.-Wirtsch.-Ing. Dick
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.)
DICK PAUL DIPL WIRTSCH ING
Original Assignee
DICK PAUL DIPL WIRTSCH ING
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 DICK PAUL DIPL WIRTSCH ING filed Critical DICK PAUL DIPL WIRTSCH ING
Publication of EP0812636A1 publication Critical patent/EP0812636A1/en
Withdrawn legal-status Critical Current

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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

Definitions

  • the invention relates to a method for producing rotationally symmetrical metallic workpieces which have flanges extending to both sides on the peripheral edge of a circular disk-shaped central part, in particular one-piece vehicle wheels, the two flanges being formed from the round rim by means of a tool roll engaging the circumference of a rotating sheet metal blank and whereby pressure rollers arranged at a constant distance from the tool roll act on both sides of the blank edge.
  • cup-shaped workpieces on both sides are conventionally either produced in two parts, the two parts being connected to one another by a joining process, or they are produced by casting technology. These conventional manufacturing methods are associated with a relatively great effort.
  • a cutting roller is used as the tool roller, which performs a splitting function.
  • Support rollers only support the two split-off parts of the blank in order to hold them against the flanks of the tool roll.
  • a radial crack forms, the course of which cannot be controlled.
  • the object of the invention is therefore to design a method of the type mentioned at the outset so that it can be used to produce relatively large, thin-walled workpieces, in particular vehicle wheels, with sufficient accuracy and without error.
  • the tool roll is a forming roller and that compressive stresses are generated in the forming zone by the pressure rollers.
  • the stresses generated in the forming zone by the forming roller are superimposed by the axially acting pressure rollers, which on the one hand prevent any crack formation that precedes the forming rollers and on the other hand do not allow the sheet metal disc to deflect or buckle to the side or form wrinkles.
  • the interaction of the forming roller with the two pressure rollers creates a stress state in the forming zone which is comparable to the stress state during backward extrusion.
  • the workpiece is thus formed essentially exclusively by a flow process that takes place in the compressive stress range and therefore does not allow any free crack formation in the material. This means that even relatively thin sheet blanks with a relatively large size can be used Flanges can be made on both sides in the desired wall thickness.
  • the invention also relates to an advantageous device for carrying out the method.
  • the device has a rotatably drivable clamping device for the sheet metal blank and a radially adjustable tool carrier on which the forming roller is mounted, two pressure rollers acting on both sides of the blank edge being supported on the tool carrier, one of which is mounted on the tool carrier at least one can be swiveled sideways, according to the invention characterized in that the axes of rotation of the pressure rollers run at an angle to the axis of rotation of the clamping device for the sheet metal blank, and the tool roller is a forming roller with a rounded peripheral edge, to each of which a roller cone-shaped tapered roller section adjoins.
  • the tool unit consisting of the forming roller and the two pressure rollers is fed against the rotating sheet blank while maintaining the mutual assignment of these rollers and executes the forming process, the forming ratios remaining unchanged regardless of the respective radial infeed position.
  • the device shown has a clamping device 1 for a sheet metal blank 2.
  • the clamping device 1 is connected to a rotary drive (not shown) and is mounted in a machine frame 3.
  • a tool carrier 5 which can be advanced radially to the axis of rotation of the clamping device 1 by means of a feed drive 4 carries a forming roller 6 which is freely rotatably mounted therein and whose axis of rotation runs parallel to the axis of rotation of the clamping device 1.
  • the forming roller 6 is aligned with the circumference of the sheet metal blank 2.
  • each pressure roller 7 is mounted in a swivel bracket 8, which in turn is mounted on a support body 9, which is attached to the tool holder 5 and is radially adjustable relative to the axis of rotation of the sheet metal blank 2.
  • the axes of rotation of the pressure rollers 7 run at an angle of, for example, approximately 45 ° to the axis of rotation of the clamping device 1 for the sheet metal disc 2.
  • the swivel bracket 8 can be swiveled by means of a swivel drive 10, which is designed, for example, as a hydraulic cylinder.
  • the swivel bracket 8 acts with a Pivot stop 11 together, which limits the pivoting movement of the pivot support 8.
  • a swivel stop for the swivel bracket 8 can instead also be arranged on the inside. Due to the pivoting, the associated pressure roller 7 can be lifted so far from the workpiece made from the sheet metal blank 2 that the finished workpiece can be removed.
  • the forming roller 6 has a rounded peripheral edge 12, to which a roller section 13 which tapers in the shape of a truncated cone is connected on both sides.
  • the pressure rollers 7 pressing from both sides against the sheet metal disc 2 likewise have a rounded peripheral edge 14, which is adjoined on both sides by a roller section 15 which tapers in the shape of a truncated cone.
  • the rounded peripheral edge 14 of the pressure rollers 7 in each case forms a roller portion engaging the sheet metal blank 2 and a roller portion engaging the inside of the associated flange 2a produced.
  • the tool carrier 5 with the pressure rollers 7 and the shaping roller 6 mounted thereon are moved radially against the blank edge of the rotating sheet metal blank 2.
  • the rim edge is formed in one flow process, the two side flanges 2a being formed.
  • the pressure rollers 7 acting on the forming zone there superimpose additional compressive stresses on the tensions generated by the forming roller 6, which lead to the flow process.
  • the constant distance between the forming roller 6 and the pressure rollers 7 during the forming process determines the wall thickness of the flanges 2a produced in the process.
  • the distance between the forming roller 6 and the pressure rollers 7 can be changed during the forming operation in order to change the wall thickness of the flanges 2a in certain areas.
  • asymmetrical flanges can also be produced in this way.
  • a change in this distance and thus the wall thickness of the flanges 2a is achieved in that the support body 9, which is mounted on the tool carrier 5 on a pivot pin 16, is pivoted by means of an adjusting screw 17.
  • a radial adjustment of the pivot pin 18 takes place, on which the pivot carrier 8 is mounted on the support body 9.
  • the quarter turn actuator 1o is actuated.
  • the swiveling movement of the swivel support 8 lifts the pressure roller 7 so far from the workpiece that it can be removed.
  • both pressure rollers 7 are mounted on pivot supports 8 in the manner described and shown in FIG. 2, so that both pressure rollers 7 can be pivoted away on both sides.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

The method involves the use of a tool roller in the form of a deforming roll (6) to engage with the circumference of a rotating round sheet blank (2). There are pressure rolls (7) engaging with the deforming roll, by which pressure stresses are created in the deformation zone. By means of a flow process, the edge of the round blank is deformed into two flanges extending out on both sides. At least one of the two pressure rolls can be turned away sideways in order for the workpiece to be removed.

Description

Die Erfindung betrifft ein Verfahren zum Herstellen von rotationssymmetrischen metallischen Werkstücken, die am Umfangsrand eines kreisscheibenförmigen Mittelteils sich nach beiden Seiten erstreckende Flansche aufweisen, insbesondere von einteiligen Fahrzeugrädern, wobei mittels einer am Umfang einer rotierenden Blechronde angreifenden Werkzeugrolle die beiden Flansche aus dem Rondenrand geformt werden und wobei im gleichbleibendem Abstand zur Werkzeugrolle angeordnete Druckwalzen beidseitig am Rondenrand angreifen.The invention relates to a method for producing rotationally symmetrical metallic workpieces which have flanges extending to both sides on the peripheral edge of a circular disk-shaped central part, in particular one-piece vehicle wheels, the two flanges being formed from the round rim by means of a tool roll engaging the circumference of a rotating sheet metal blank and whereby pressure rollers arranged at a constant distance from the tool roll act on both sides of the blank edge.

Solche nach beiden Seiten napfförmigen Werkstücke, für die die Fahrzeugräder typische Ausführungsbeispiele darstellen, werden herkömmlich entweder zweiteilig hergestellt, wobei beide Teile durch ein Fügeverfahren miteinander verbunden werden, oder sie werden gießtechnisch gefertigt. Diese herkömmlichen Herstellungsverfahren sind mit verhältnismäßig großem Aufwand verbunden.Such cup-shaped workpieces on both sides, for which the vehicle wheels represent typical exemplary embodiments, are conventionally either produced in two parts, the two parts being connected to one another by a joining process, or they are produced by casting technology. These conventional manufacturing methods are associated with a relatively great effort.

Neuere Entwicklungen in der Umformtechnik haben gezeigt, daß durch das Aufspalten des Rondenrandes einer ebenen Blechronde in radialer Richtung und anschließender Drückwalzoperation die Möglichkeit besteht, beidseitig napfförmige Werkstücke der beschriebenen Art einteilig und in einem einzigen Fertigungsablauf herzustellen.Recent developments in forming technology have shown that by splitting the blank edge of a flat sheet round in the radial direction and subsequent spinning operation, it is possible to manufacture cup-shaped workpieces of the type described in one piece and in a single production process on both sides.

Mehreren bekannten Verfahren ist gemeinsam, daß mittels einer scharfkantigen schmalen Spaltwalze der Rand der Blechronde durch eine radial Wirkbewegung gespalten wird (DE-PS 1 206 838, DE 32 39 675 C2). Die hierbei im Spaltgrund erzeugten Zugspannungen führen zur Ausbildung eines radialen Risses, der der Spaltwalze vorausläuft und die Spaltung des Materials bewirkt. Diese weitgehend unkontrollierte Rißbildung führt zu Werkstückfehlern, die den Einsatz dieses Verfahrens für hochbeanspruchte Werkstücke, wie Fahrzeugräder, ausschließen.A number of known methods have in common that the edge of the sheet round plate is split by a radial active movement by means of a sharp-edged, narrow splitting roller (DE-PS 1 206 838, DE 32 39 675 C2). The tensile stresses generated in the nip base lead to the formation of a radial crack which leads the nip roll and causes the material to split. This largely uncontrolled crack formation leads to workpiece defects, which preclude the use of this method for highly stressed workpieces, such as vehicle wheels.

Eine weitere Schwierigkeit dieser bekannten Verfahren besteht darin, daß der Rand der Blechronde gegenüber der Spaltwalze seitlich ausweicht. Deshalb ist bei einem bekannten Verfahren (EP 01 09 654 A1) schon vorgeschlagen worden, die Spaltwalze in der Weise asymmetrisch auszuführen, daß sie die Blechronde nach einer Seite gegen eine dort angeordnete, zusammen mit der Spaltwalze radial verschiebbare Stützrolle drückt. Dadurch wird aber das beschriebene Problem des unkontrolliert vor der Spaltwalze vorauslaufenden Risses nicht gelöst.A further difficulty of these known methods is that the edge of the sheet round plate laterally deviates from the splitting roller. For this reason, in a known method (EP 01 09 654 A1) it has already been proposed to design the nip roller asymmetrically in such a way that it presses the sheet round to one side against a support roller arranged there and radially displaceable together with the nip roller. However, this does not solve the described problem of the crack running ahead of the nip roller in an uncontrolled manner.

Um ein Ausweichen der Ronde zu verhindern, ist bei einem anderen bekannten Verfahren (DE 30 40 620 A1) vorgesehen, beiderseits der Blechronde anliegende Zentrierscheiben anzuordnen, die aus Stufenringen aufgebaut sind, die entsprechend dem Fortschreiten des Spaltvorgangs abgenommen werden. Auch hierbei wird die Problematik des unkontrolliert vorauslaufenden Risses nicht gelöst; außerdem ist das Abnehmen der Stufenringe so umständlich, daß dieses Verfahren für einen weitgehend automatisch ablaufenden Fertigungsvorgang nicht geeignet ist.In order to prevent the round blank from escaping, another known method (DE 30 40 620 A1) provides for centering disks which lie on both sides of the sheet round blank and which are constructed from stepped rings which be removed in accordance with the progress of the splitting process. Here too the problem of the uncontrolled leading crack is not solved; in addition, the removal of the step rings is so cumbersome that this method is not suitable for a largely automatic manufacturing process.

Bei einem bekannten Verfahren (DE 16 02 594 A1) wird als Werkzeugrolle eine Schneidrolle verwendet, die eine Spaltfunktion ausübt. Stutzrollen stützen nur die beiden abgespaltenen Rondenteile, um diese in Anlage an den Flanken der Werkzeugrolle zu halten. Auch hierbei bildet sich ein radialer Riß, dessen Verlauf nicht kontrollierbar ist.In a known method (DE 16 02 594 A1) a cutting roller is used as the tool roller, which performs a splitting function. Support rollers only support the two split-off parts of the blank in order to hold them against the flanks of the tool roll. Here too, a radial crack forms, the course of which cannot be controlled.

Es ist auch bekannt (DE 35 39 835 C1), an einer angenähert zylindrischen Spaltwalze am Umfang eine umlaufende, verhältnismäßig kleine Schneidspitze vorzusehen, durch die während des Verformungsvorgangs ein seitliches Ausweichen des Rondenrandes verhindert werden soll. Wegen der Verwendung einer Schneidspitze tritt aber auch hierbei ein der Schneidspitze vorauseilender Riß in der Blechronde auf.It is also known (DE 35 39 835 C1) to provide a circumferential, relatively small cutting tip on an approximately cylindrical nip roller on the circumference, by means of which lateral deflection of the blank edge is to be prevented during the deformation process. Because of the use of a cutting tip, however, a crack in the sheet metal blank that precedes the cutting tip also occurs here.

Mit dem zuletzt genannten bekannten Verfahren sollte eine Verbesserung eines bekannten Verfahrens (EP 0 143 032 B1) der eingangs genannten Gattung erzielt werden, bei dem eine zylindrische Umformwalze gegen den Umfang einer rotierenden Blechronde gedrückt wird, die durch einen Stauchvorgang unter Vermeidung eines Spaltens die nach beiden Seiten gerichteten Flansche aus dem Rondenrand durch Umformung erzeugt. Die für diesen Umformvorgang erforderlichen, verhältnismäßig hohen radialen Kräfte führen aber bei dünnen Blechronden zum Ausknicken und/oder zur Faltenbildung. Deshalb ist dieses bekannte Verfahren für den Einsatz in der Praxis, insbesondere zur Herstellung von Fahrzeugrädern und ähnlichen Werkstücken, nicht geeignet.With the last-mentioned known method, an improvement of a known method (EP 0 143 032 B1) of the type mentioned at the outset was to be achieved, in which a cylindrical forming roller is pressed against the circumference of a rotating sheet metal blank, which is followed by an upsetting process while avoiding splitting flanges on both sides are created from the rim edge by reshaping. The relatively high radial forces required for this forming process lead to thin sheet blanks Buckling and / or wrinkling. This known method is therefore not suitable for use in practice, in particular for the production of vehicle wheels and similar workpieces.

Aufgabe der Erfindung ist es daher, ein Verfahren der eingangs genannten Gattung so auszubilden, daß damit verhältnismäßig große, dünnwandige Werkstücke, insbesondere Fahrzeugräder, mit ausreichender Genauigkeit fehlerlos hergestellt werden können.The object of the invention is therefore to design a method of the type mentioned at the outset so that it can be used to produce relatively large, thin-walled workpieces, in particular vehicle wheels, with sufficient accuracy and without error.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Werkzeugrolle eine Umformwalze ist und daß durch die Druckwalzen Druckspannungen in der Umformzone erzeugt werden.This object is achieved in that the tool roll is a forming roller and that compressive stresses are generated in the forming zone by the pressure rollers.

Den in der Umformzone durch die Umformwalze erzeugten Spannungen werden durch die axial angreifenden Druckwalzen Druckspannungen überlagert, die einerseits jegliche der Umformwalzen vorauseilende Rißbildungen verhindern und andererseits ein seitliches Ausweichen bzw. Ausknicken der Blechronde oder eine Faltenbildung nicht zulassen.The stresses generated in the forming zone by the forming roller are superimposed by the axially acting pressure rollers, which on the one hand prevent any crack formation that precedes the forming rollers and on the other hand do not allow the sheet metal disc to deflect or buckle to the side or form wrinkles.

Durch das Zusammenwirken der Umformwalze mit den beiden Druckwalzen entsteht in der Umformzone ein Spannungszustand, der dem Spannungszustand beim Rückwärtsfließpressen vergleichbar ist. Die Werkstückumformung erfolgt somit im wesentlichen durch ausschließlich durch einen Fließvorgang, der im Druckspannungsbereich erfolgt und daher keinerlei freie Rißbildung im Werkstoff zuläßt. Damit können auch an verhältnismäßig dünnen Blechronden mit verhältnismäßig großem Durchmesser nach beiden Seiten Flansche in der jeweils gewünschten Wanddicke hergestellt werden.The interaction of the forming roller with the two pressure rollers creates a stress state in the forming zone which is comparable to the stress state during backward extrusion. The workpiece is thus formed essentially exclusively by a flow process that takes place in the compressive stress range and therefore does not allow any free crack formation in the material. This means that even relatively thin sheet blanks with a relatively large size can be used Flanges can be made on both sides in the desired wall thickness.

Die Erfindung betrifft auch eine vorteilhafte Vorrichtung zur Durchführung des Verfahrens. Ausgehend von der bekannten Vorrichtung (EP 0 143 032 B1) ist die Vorrichtung mit einer drehantreibbaren Aufspanneinrichtung für die Blechronde und einem radial zustellbaren Werkzeugträger, an dem die Umformwalze gelagert ist, wobei an dem Werkzeugträger zwei beiderseits am Rondenrand angreifende Druckwalzen gelagert sind, von denen mindestens eine seitlich wegschwenkbar ist, erfindungsgemäß dadurch gekennzeichnet, daß die Drehachsen der Druckwalzen im Winkel zur Drehachse der Aufspanneinrichtung für die Blechronde verlaufen und die Werkzeugrolle eine Umformwalze mit abgerundeter Umfangskante ist, an die sich beiderseits jeweils ein sich kegelstumpfförmig verjüngender Walzenabschnitt anschließt. Die aus der Umformwalze und den beiden Druckwalzen bestehende Werkzeug-Einheit wird unter Beibehaltung der gegenseitigen Zuordnung dieser Walzen gegen die sich drehende Blechronde zugestellt und führt dabei den Umformvorgang aus, wobei die Umformverhältnisse unabhängig von der jeweiligen radialen Zustellposition unverändert bleiben.The invention also relates to an advantageous device for carrying out the method. Starting from the known device (EP 0 143 032 B1), the device has a rotatably drivable clamping device for the sheet metal blank and a radially adjustable tool carrier on which the forming roller is mounted, two pressure rollers acting on both sides of the blank edge being supported on the tool carrier, one of which is mounted on the tool carrier at least one can be swiveled sideways, according to the invention characterized in that the axes of rotation of the pressure rollers run at an angle to the axis of rotation of the clamping device for the sheet metal blank, and the tool roller is a forming roller with a rounded peripheral edge, to each of which a roller cone-shaped tapered roller section adjoins. The tool unit consisting of the forming roller and the two pressure rollers is fed against the rotating sheet blank while maintaining the mutual assignment of these rollers and executes the forming process, the forming ratios remaining unchanged regardless of the respective radial infeed position.

Weitere vorteilhafte Ausgestaltungen des Erfindungsgedankens sind Gegenstand weiterer abhängiger Ansprüche.Further advantageous embodiments of the inventive concept are the subject of further dependent claims.

Die Erfindung wird nachfolgend an einem Ausführungsbeispiel einer Vorrichtung zur Durchführung des Verfahrens näher erläutert, die in der Zeichnung dargestellt ist. Es zeigt:

  • Fig. 1 in schematischer Darstellungsweise eine Vorrichtung zur Herstellung von einteiligen Fahrzeugrädern aus Blechronden und
  • Fig. 2 Einzelheiten der Vorrichtung nach Fig. 1.
The invention is explained in more detail below using an exemplary embodiment of a device for carrying out the method, which is shown in the drawing. It shows:
  • Fig. 1 shows a schematic representation of a device for producing one-piece vehicle wheels from sheet blanks and
  • 2 details of the device of FIG. 1st

Die dargestellte Vorrichtung weist eine Aufspanneinrichtung 1 für eine Blechronde 2 auf. Die Aufspanneinrichtung 1 ist mit einem (nicht dargestellten) Drehantrieb verbunden und ist in einem Maschinengestell 3 gelagert. Ein mittels eines Zustellantriebs 4 radial zur Drehachse der Aufspanneinrichtung 1 zustellbarer Werkzeugträger 5 trägt eine darin frei drehbar gelagerte Umformwalze 6, deren Drehachse parallel zur Drehachse der Aufspanneinrichtung 1 verläuft. Die Umformwalze 6 ist auf den Umfang der Blechronde 2 ausgerichtet.The device shown has a clamping device 1 for a sheet metal blank 2. The clamping device 1 is connected to a rotary drive (not shown) and is mounted in a machine frame 3. A tool carrier 5 which can be advanced radially to the axis of rotation of the clamping device 1 by means of a feed drive 4 carries a forming roller 6 which is freely rotatably mounted therein and whose axis of rotation runs parallel to the axis of rotation of the clamping device 1. The forming roller 6 is aligned with the circumference of the sheet metal blank 2.

Am Werkzeugträger 5 sind beiderseits der Blechronde 2 zwei an deren Rondenrand angreifende Druckwalzen 7 angeordnet. Jede Druckwalze 7 ist in einem Schwenkträger 8 gelagert, der wiederum an einem Stützkörper 9 gelagert ist, der am Werkzeugträger 5 angebracht ist und gegenüber diesem radial zur Drehachse der Blechronde 2 verstellbar ist.On the tool carrier 5, on both sides of the sheet metal blank 2, two pressure rollers 7 engaging on the edge of the blank are arranged. Each pressure roller 7 is mounted in a swivel bracket 8, which in turn is mounted on a support body 9, which is attached to the tool holder 5 and is radially adjustable relative to the axis of rotation of the sheet metal blank 2.

Die Drehachsen der Druckwalzen 7 verlaufen in einem Winkel von beispielsweise etwa 45° zur Drehachse der Aufspanneinrichtung 1 für die Blechronde 2.The axes of rotation of the pressure rollers 7 run at an angle of, for example, approximately 45 ° to the axis of rotation of the clamping device 1 for the sheet metal disc 2.

Mittels eines Schwenkantriebs 10, der beispielsweise als Hydraulikzylinder ausgeführt ist, kann der Schwenkträger 8 geschwenkt werden. Der Schwenkträger 8 wirkt mit einem Schwenkanschlag 11 zusammen, der die Schwenkbewegung des Schwenkträgers 8 begrenzt. Ein Schwenkanschlag für den Schwenkträger 8 kann stattdessen auch innenliegend angeordnet sein. Durch die Schwenkung kann die zugeordnete Druckwalze 7 so weit von dem aus der Blechronde 2 hergestellten Werkstück abgehoben werden, daß das fertige Werkstück herausgenommen werden kann.The swivel bracket 8 can be swiveled by means of a swivel drive 10, which is designed, for example, as a hydraulic cylinder. The swivel bracket 8 acts with a Pivot stop 11 together, which limits the pivoting movement of the pivot support 8. A swivel stop for the swivel bracket 8 can instead also be arranged on the inside. Due to the pivoting, the associated pressure roller 7 can be lifted so far from the workpiece made from the sheet metal blank 2 that the finished workpiece can be removed.

Wie man aus Fig. 2 erkennt, weist die Umformwalze 6 eine abgerundete Umfangskante 12 auf, an die sich beiderseits jeweils ein sich kegelstumpfförmig verjüngender Walzenabschnitt 13 anschließt.As can be seen from FIG. 2, the forming roller 6 has a rounded peripheral edge 12, to which a roller section 13 which tapers in the shape of a truncated cone is connected on both sides.

Die von beiden Seiten gegen die Blechronde 2 drückenden Druckwalzen 7 weisen ebenfalls eine abgerundete Umfangskante 14 auf, an die sich beiderseits ein kegelstumpfförmig verjüngender Walzenabschnitt 15 anschließt. Die abgerundete Umfangskante 14 der Druckwalzen 7 bildet jeweils einen an der Blechronde 2 angreifenden Walzenabschnitt und einen an der Innenseite des zugeordneten erzeugten Flansches 2a angreifenden Walzenabschnitt.The pressure rollers 7 pressing from both sides against the sheet metal disc 2 likewise have a rounded peripheral edge 14, which is adjoined on both sides by a roller section 15 which tapers in the shape of a truncated cone. The rounded peripheral edge 14 of the pressure rollers 7 in each case forms a roller portion engaging the sheet metal blank 2 and a roller portion engaging the inside of the associated flange 2a produced.

Zur Durchführung des Umformvorgangs wird der Werkzeugträger 5 mit den daran gelagerten Druckwalzen 7 und der Umformwalze 6 radial gegen den Rondenrand der sich drehenden Blechronde 2 verfahren. Der Rondenrand wird dabei in einem Fließvorgang umgeformt, wobei die beiden seitlichen Flansche 2a gebildet werden. Die auf die Umformzone einwirkenden Druckwalzen 7 überlagern dort den von der Umformwalze 6 erzeugten Spannungen zusätzliche Druckspannungen, die zu dem Fließvorgang führen.To carry out the shaping process, the tool carrier 5 with the pressure rollers 7 and the shaping roller 6 mounted thereon are moved radially against the blank edge of the rotating sheet metal blank 2. The rim edge is formed in one flow process, the two side flanges 2a being formed. The pressure rollers 7 acting on the forming zone there superimpose additional compressive stresses on the tensions generated by the forming roller 6, which lead to the flow process.

Der während des Umformvorgangs gleichbleibende Abstand zwischen der Umformwalze 6 und den Druckwalzen 7 bestimmt die Wanddicke der dabei erzeugten Flansche 2a. Stattdessen kann während des Umformvorgangs eine Veränderung des Abstands zwischen der Umformwalze 6 und den Druckwalzen 7 erfolgen, um die Wanddicke der Flansche 2a bereichsweise zu ändern. Beispielsweise können auf diese Weise auch asymmetrisch ausgebildete Flansche erzeugt werden. Eine Veränderung dieses Abstandes und damit der Wanddicke der Flansche 2a wird dadurch erreicht, daß der am Werkzeugträger 5 auf einem Gelenkzapfen 16 gelagerte Stützkörper 9 mittels einer Verstellschraube 17 geschwenkt wird. Dabei erfolgt eine radiale Verstellung des Gelenkzapfens 18, an dem der Schwenkträger 8 am Stützkörper 9 gelagert ist.The constant distance between the forming roller 6 and the pressure rollers 7 during the forming process determines the wall thickness of the flanges 2a produced in the process. Instead, the distance between the forming roller 6 and the pressure rollers 7 can be changed during the forming operation in order to change the wall thickness of the flanges 2a in certain areas. For example, asymmetrical flanges can also be produced in this way. A change in this distance and thus the wall thickness of the flanges 2a is achieved in that the support body 9, which is mounted on the tool carrier 5 on a pivot pin 16, is pivoted by means of an adjusting screw 17. A radial adjustment of the pivot pin 18 takes place, on which the pivot carrier 8 is mounted on the support body 9.

Nach Fertigstellung des Werkstücke wird der Schwenkantrieb 1o betätigt. Die Schwenkbewegung des Schwenkträgers 8 hebt die Druckwalze 7 so weit vom Werkstück ab, daß dieses herausgenommen werden kann. Vorzugsweise sind beide Druckwalzen 7 in der beschriebenen und in Fig. 2 dargestellten Weise an Schwenkträgern 8 gelagert, so daß beide Druckwalzen 7 nach beiden Seiten weggeschwenkt werden können.After completion of the workpieces, the quarter turn actuator 1o is actuated. The swiveling movement of the swivel support 8 lifts the pressure roller 7 so far from the workpiece that it can be removed. Preferably, both pressure rollers 7 are mounted on pivot supports 8 in the manner described and shown in FIG. 2, so that both pressure rollers 7 can be pivoted away on both sides.

Claims (5)

Verfahren zum Herstellen von rotationssymmetrischen metallischen Werkstücken, die am Umfangsrand eines kreisscheibenförmigen Mittelteils sich nach beiden Seiten erstreckende Flansche aufweisen, insbesondere von einteiligen Fahrzeugrädern, wobei mittels einer am Umfang einer rotierenden Blechronde (2) angreifenden Werkzeugrolle (6) die beiden Flansche (2a) aus dem Rondenrand geformt werden und wobei in gleichbleibendem Abstand zur Werkzeugrolle (6) angeordnete Druckwalzen (7) beidseitig am Rondenrand angreifen, dadurch gekennzeichnet, daß die Werkzeugrolle eine Umformwalze (6) ist und daß durch die Druckwalzen (7) Druckspannungen in der Umformzone erzeugt werden.Method for producing rotationally symmetrical metallic workpieces, which have flanges extending on both sides at the peripheral edge of a circular disk-shaped central part, in particular one-piece vehicle wheels, the two flanges (2a) being removed by means of a tool roller (6) which engages on the circumference of a rotating sheet metal blank (2) the blank edge are formed and wherein at a constant distance from the tool roll (6) arranged pressure rollers (7) engage on both sides of the blank edge, characterized in that the tool roll is a forming roller (6) and that the pressure rollers (7) generate compressive stresses in the forming zone . Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1, mit einer drehantreibbaren Aufspanneinrichtung (1) für die Blechronde (2) und einem radial zustellbaren Werkzeugträger (5) , an dem eine Werkzeugrolle (6) gelagert ist, wobei an dem Werkzeugträger (5) zwei beiderseits am Rondenrand angreifende Druckwalzen (7) gelagert sind, von denen mindestens eine seitlich wegschwenkbar ist, dadurch gekennzeichnet, daß die Drehachsen der Druckwalzen (7) im Winkel zur Drehachse der Aufspanneinrichtung (1) für die Blechronde (2) verlaufen und die Werkzeugrolle eine Umformwalze (6) mit abgerundeter Umfangskante (12) ist, an die sich beiderseits jeweils ein sich kegelstumpfförmig verjüngender Walzenabschnitt (13) anschließt.Device for carrying out the method according to claim 1, with a rotationally drivable clamping device (1) for the sheet metal blank (2) and a radially adjustable tool holder (5) on which a tool roll (6) is mounted, two on both sides of the tool holder (5) on the rim edge engaging pressure rollers (7) are mounted, at least one of which can be pivoted sideways, thereby characterized in that the axes of rotation of the pressure rollers (7) run at an angle to the axis of rotation of the clamping device (1) for the sheet metal blank (2) and the tool roll is a forming roller (6) with a rounded peripheral edge (12), on each side of which a frustoconical shape tapering roller section (13) connects. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß jede der beiden Druckwalzen (7) jeweils an einem Schwenkträger (8) gelagert ist und daß der Schwenkträger (8) an einem radial zur Drehachse der Blechronde (2) verstellbaren Stützkörper (9) am Werkzeugträger (5) gelagert ist.Apparatus according to claim 2, characterized in that each of the two pressure rollers (7) is in each case mounted on a swivel support (8) and in that the swivel support (8) is mounted on a support body (9) on the tool support (radially to the axis of rotation of the sheet round blank (2)) 5) is stored. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß am Schwenkträger (8) ein Schwenkantrieb (10) angreift.Device according to claim 3, characterized in that a swivel drive (10) acts on the swivel support (8). Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß der Schwenkträger (8) mit einem Schwenkanschlag (11) zusammenwirkt.Apparatus according to claim 3, characterized in that the swivel bracket (8) cooperates with a swivel stop (11).
EP97109632A 1996-06-14 1997-06-13 Method and device for producing rotationally symmetrical workpieces, in particular vehicle wheels Withdrawn EP0812636A1 (en)

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DE19623866 1996-06-14
DE1996123866 DE19623866C2 (en) 1996-06-14 1996-06-14 Method and device for producing rotationally symmetrical workpieces, in particular vehicle wheels

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DE19623866C2 (en) 1999-09-09
DE19623866A1 (en) 1998-01-02

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