EP2771137A1 - Device and method for producing a lightweight metal wheel - Google Patents

Device and method for producing a lightweight metal wheel

Info

Publication number
EP2771137A1
EP2771137A1 EP12818482.7A EP12818482A EP2771137A1 EP 2771137 A1 EP2771137 A1 EP 2771137A1 EP 12818482 A EP12818482 A EP 12818482A EP 2771137 A1 EP2771137 A1 EP 2771137A1
Authority
EP
European Patent Office
Prior art keywords
preform
rollers
freely rotating
stretching
rotating rollers
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
EP12818482.7A
Other languages
German (de)
French (fr)
Other versions
EP2771137B1 (en
Inventor
Giorgio MUFFATTO
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.)
RONAL AG
Original Assignee
RONAL AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=47603518&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP2771137(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by RONAL AG filed Critical RONAL AG
Priority to EP16002381.8A priority Critical patent/EP3189909B1/en
Priority to PL12818482T priority patent/PL2771137T3/en
Priority to PL16002381T priority patent/PL3189909T3/en
Publication of EP2771137A1 publication Critical patent/EP2771137A1/en
Application granted granted Critical
Publication of EP2771137B1 publication Critical patent/EP2771137B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
    • B21D22/14—Spinning
    • B21D22/16—Spinning over shaping mandrels or formers
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/002—Positioning devices
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/004—Bending sheet metal along straight lines, e.g. to form simple curves with program control
    • 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
    • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
    • B21D5/04—Bending sheet metal along straight lines, e.g. to form simple curves on brakes making use of clamping means on one side of the work
    • 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
    • B21D53/30—Making other particular articles wheels or the like wheel rims

Definitions

  • the invention relates to a device for producing lightweight metal wheel from a preform, with stretching rollers acting on the rim region of the preform, by means of which a rim of the wheel is finally shaped.
  • the invention further relates to methods for producing a metal wheel from a preform, wherein the preform of the metal wheel to be produced is placed on a mandrel and rotated, in the upper region of a rotationally symmetrical shell of the preform drafting rollers under radial
  • the invention relates in particular to the production of light-alloy wheels made of aluminum or aluminum alloy by means of flowforming.
  • This is a sub-form of Shear Forming, while in German different terms, such as flow (pressure) rollers, rotating rollers or draw rolls are used and here the latter
  • Stretching is a non-cutting forming process for final shaping of lightweight aluminum bodies such as aluminum or aluminum alloys, particularly metal wheels.
  • the preform of a wheel with a rotationally symmetrical sheath formation on a simple, rotating tool a mandrel is placed, which is rotated with the preform in rotation.
  • a plurality of differently shaped drafting rollers engage with radial pressure on the rotationally symmetrical peripheral wall of the preform and are moved along this, ie in an axial component during the rotation of the preform, whereby on the one hand a compression of the material takes place, on the other hand by the substantially in Axes moving draw rollers stretched and thus deformed and just when producing a metal wheel to the rim of the same.
  • This processing operation in itself a cold-forming process, can be carried out at an elevated temperature of up to 350 ° C., wherein it should be noted that heating takes place anyway by the deformation process by means of the drafting rollers alone.
  • Such methods are basically known from US 2003/0145466 AI or ITVI20040061 A.
  • the disadvantage is that the inner or underside of the wheel to be produced is predetermined by the shape of the mandrel and the peripheral edge of the rim flange, where appropriate, only in a complex manner by moving the same down with the
  • Stretching rollers can be finally formed, on the one hand com- Planned control operations of the movement are required, on the other hand, the mandrel may interfere.
  • the invention is therefore based on the object to further develop a generic method and a generic device for producing metal wheels to the effect that in particular the inner rim flange can be made better, faster and less expensive.
  • a device is characterized by arranged below the draw rolls, cooperating with these freely rotatable rollers.
  • An inventive method is to achieve the object characterized in that the preform of free-rotating rollers is under-gripped, which are arranged at the same circumferential angles as the draw rolls around the circumference of the preform, so that the draw rolls by stretching preform material against the under cross-exposed turning wheels to form a rim flange.
  • the device according to the invention has a mandrel and draw rolls accommodating the preform of the wheel, which initially engage in the outer region (which is placed at the top for processing) of a rotationally symmetrical shell of the preform.
  • the drafting rollers are under radial pressure exerting under - radial - compression and - axial - stretching - the shell wall along the same movable. By means of the drafting rollers, the rim of the wheel is finally shaped along the mandrel.
  • the mandrel inside the preform of the wheel or in ⁇ neren of the wheel to be produced is a rotationally symmetrical body and has no undercuts in the shell area on; Preferably, the mandrel widens slightly conically from the outside of the wheel to the inside.
  • the mandrel does not have to be a multi-part body, as would be the case with undercuts, whose individual parts would then have to be retracted by additional hydraulic fasteners to remove the wheel, making such tool design vulnerable and also the precision of the wheel may affect in terms of the important roundness and unbalances verursa ⁇ chen.
  • the mandrel protrudes inside the produced wheel to the inside up to the height of the inner rim flange, but does not take this under.
  • the device according to the invention is designed in such a way that at least one of the stretch rollers acting laterally on the wheel carries out the (flow) shaping of the wheel casing over its entire height, including the shaping of the outer side of the inner rim flange.
  • the forming can be done as a hot or as cold-forming, the former being used with hot preform and hot tool, the latter with cold preform and cold tool, which heat up due to the machining process in a way.
  • the former is used in particular for cast preforms, the latter for forged preforms.
  • a device can furthermore be configured in that the freely rotating rollers have an axis of rotation inclined at an angle of inclination of 50 ° to 70 ° to a rotational axis of the preform, wherein in particular the Inclination angle of the axes of rotation of the freely rotating rollers to the axis of rotation of the preform is adjustable.
  • the freely rotating rollers engage the rim flange to be formed with its jacket wall, wherein in particular the freely rotating rollers are frusto-conical and / or the shell wall of the freely rotating rollers an angle between 20 ° and 40 ° to the axis of rotation which includes freely rotating rollers. Also, a rim end forming profile stretching roller can be provided.
  • the inventive method provides in a development that the freely rotating rollers rotate about axes that include inclination angles of 50 ° to 70 ° to the axis of rotation of the preform, in particular, the free-rotating rollers engage under the lower edge of the preform with its coat, the one Includes angles of 20 ° to 40 ° to the rotation axis of the freely rotating rollers.
  • at least one profile stretching roller for the final shaping of the rim flange engages under radial pressure exerted on the rim flange formed between draw rolls and freely rotating rolls.
  • the invention provides in particular the possibility for a speedy, accurate and optimal design of the inner rim flange of a light metal wheel.
  • FIG. 4 shows a partial view corresponding to FIG.
  • the wheel 1 has a rim 1.1 and on its outside la a wheel disc plate or a spoke area 1.3 with a hub 1.4. In the inner area of the wheel disc 1.3 outside of the hub 1.4, apertures 1.5 are provided for fastening the wheel by means of screws on the vehicle.
  • the rim 1.1 has an outer rim flange 1.6 near the wheel disc 1.3 and an inner rim flange 1.7, facing away from the wheel disc 1.3, on the inner side 1b.
  • the shell of the preform 1.8 in particular in its inner region radially extends well beyond the final contour of the wheel out.
  • the jacket extends in the axial direction only over part of the height of the finished wheel, preferably over 50% to 75%.
  • the essential tool elements of the device according to the invention for producing such a metal wheel in particular light metal wheel, shown from the preform, namely a simple engaging in the preform or the wheel tool 2 in the form of a mandrel, several on the Peripheral wall of the preform or of the wheel attacking differently formed draw rolls 3, the lower edge of the inner or lower edge of the rim 1.5 of the almost finished wheel 1 under cross-freely rotating rollers 4 and at least one profile stretching roller 5 (Fig. 3, 4).
  • the draw rolls 3 are each rotatable about a substantially vertically extending axis of rotation.
  • the preform of the wheel 1 is seated on a simple tool in the form of a clamping mandrel 2 designed as a rotary body, which determines the inner shape of the wheel 1.
  • the mandrel 2 is in one piece. It has no undercuts in the peripheral region and widens slightly conically from the outer side 1a of the wheel 1 to its inner side 1b, so that the finished shaped wheel can be easily removed from the mandrel 2.
  • stretching rollers 3 which, as shown in the left-side overlay representation of FIG. 1, may be formed differently. They first attack in the upper part of the preform of the wheel 1, while exerting an axial pressure and at the same time go along the preform of the wheel down, being the pressure exerted by the later wheel casing or the actual rim 1.1 of the wheel 1 forming part 1.8 Stretch the preform of the wheel downwards and compact it at the same time.
  • the preform of the wheel 1 and the wheel 1 are supported on the one hand by the mandrel 2. This extends over the entire height of the wheel to be produced up to the axial height of the inner rim flange 1.7, but does not reach under the edge, the later inner rim flange 1.7 of the wheel. This one . Rather, it is underrun by additional free-running rollers 4. Preferably, three rollers are arranged, which are provided distributed uniformly over the circumference, in each case under a draw roller. 3
  • At least one profile stretching roller 5 is provided laterally in the area of the inner rim flange 1.7 to be formed circumferentially between two freely running rollers 4, which profile groove is provided by radial pressure exertion in its profile groove provided on the circumference 5.1 the profile of the inner rim flange 1.7 finishes.
  • the freely rotating rollers 4 are, as shown in FIG. 1 can be seen, with its axis of rotation 4.1 to the axis of rotation 2.1 of the mandrel 2 and thus of the rotationally fixed seated wheel 1 at an angle ⁇ of about 60 ° aligned.
  • the freely rotating rollers 4 are truncated cone-shaped and taper from their lower side toward the upper side, wherein the lateral wall 4.2 forms an angle from 20 to 30 ° to the axis of rotation 4.1 includes.
  • the freely rotating rollers 4 engage with their mantle wall on the inner underside of the wheel 1 t to form the inner rim flange 1.7.
  • the axis of rotation of the freely rotating rollers 4.1 is freely adjustable to a certain extent, for example between 50 and 70 ° relative to the axis of rotation 2.1 of the mandrel 2, so that in this way the inner end face of the inner rim flange 1.7 can be adjusted by the angle of rotation of the axis 4.1.
  • the manufacturing process is essentially the following:
  • the preform of the wheel 1 is poured and freed from connecting pin. Subsequently, the preform is clamped on the mandrel 2 and can be heated, ideally not to above 350 ° C. Then, the drafting rollers 3 move in the upper region of the preform against the same and move under the exertion of radial pressure from the outer rim flange 1.6 down to the inner rim flange 1.7, thereby forming the rim 1.1 and essentially the rim flanges 1.6, 1.7. The material of the shell of the wheel is pulled on the one hand to form the rim down in the region of the inner rim flange 1.7, so stretched, on the other hand compacts the material of the wheel.

Landscapes

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

Abstract

The invention relates to a device for producing a metal wheel (1) from a preform, with stretching rollers (3) which act on the rim region of the preform and by means of which a rim (1.1) is brought into its final form, which device is further characterized by freely rotatable rollers (4) that are arranged underneath the stretching rollers (3) and interact with them, for the forming of a rim flange (1.7). The invention further proposes for this purpose a method for producing a metal wheel (1) from a preform, wherein the preform of the metal wheel (1) to be produced is fitted onto a clamping mandrel (2) and set in rotation, stretching rollers (3) act on the preform and exert radial pressure on it in the upper region of a rotationally symmetrical shell thereof and move along the shell wall of the preform, while compressing and stretching the shell wall to form a rim (1.1), with a main movement component parallel to the axis of rotation (2.1) of the preform, wherein the method is characterized in that the preform is engaged from below by freely rotating rollers (4), which are arranged around the circumference of the preform at the same circumferential angles as the stretching rollers (3), and so the stretching rollers form a rim flange (1.7) by stretching preform material against the freely rotating rollers engaging from underneath.

Description

Vorrich-bung und Verfahren zum Herstellen eines Leicht- Apparatus and method for producing a lightweight
Metal1rades Metal1rades
Die Erfindung betrifft eine Vorrichtung zum Herstellen Leicht-Metallrades aus einer Vorform, mit am Felgenbereich der Vorform angreifenden Streckwalzen, mittels derer eine Felge des Rades endgeformt wird. Die Erfindung betrifft weiterhin Verfahren zum Herstellen eines Metallrades aus einer Vorform, wobei die Vorform des herzustellenden Metallrades auf einen Spanndorn aufgesetzt und in Drehung versetzt wird, im oberen Bereich eines rotationssymmetrischen Mantels der Vorform Streckwalzen unter radialer The invention relates to a device for producing lightweight metal wheel from a preform, with stretching rollers acting on the rim region of the preform, by means of which a rim of the wheel is finally shaped. The invention further relates to methods for producing a metal wheel from a preform, wherein the preform of the metal wheel to be produced is placed on a mandrel and rotated, in the upper region of a rotationally symmetrical shell of the preform drafting rollers under radial
Druckausübung angreifen und sich entlang der Mantelwand der Vorform unter Verdichtung und Streckung der Mantelwand zu einer Felge mit einer Hauptbewegungskomponente parallel zur Drehachse der Vorform bewegen. Pressure application attack and move along the shell wall of the preform under compression and stretching of the shell wall to a rim with a main component of movement parallel to the axis of rotation of the preform.
Die Erfindung bezieht sich insbesondere auf das Herstellen von Leichtmetallrädern aus Aluminium oder Aluminium-Legierung mittels Flowforming. Hierbei handelt es sich um eine Unterform des Shear Forming, während im Deutschen unterschiedliche Begriffe, wie Fließ (druck) walzen, Rotationswalzen oder Streckwalzen verwendet werden und hier letzterer The invention relates in particular to the production of light-alloy wheels made of aluminum or aluminum alloy by means of flowforming. This is a sub-form of Shear Forming, while in German different terms, such as flow (pressure) rollers, rotating rollers or draw rolls are used and here the latter
BESTÄTIGUNGSKOPIE Begriff benutzt werden soll. Beim Streckwalzen handelt es sich um ein nicht spanabhebendes Formverfahren zum Endformen von Rotationskörpern aus Leichtmetall, wie Aluminium oder Aluminiumelegierungen, insbesondere Metallrädern. CONFIRMATION COPY Term should be used. Stretching is a non-cutting forming process for final shaping of lightweight aluminum bodies such as aluminum or aluminum alloys, particularly metal wheels.
Hierbei wird die Vorform eines Rades mit einer rotationssymmetrischen Mantelausbildung auf einem einfachen, sich drehenden Werkzeug, einem Spanndorn aufgesetzt, der mit der Vorform in Drehung versetzt wird. Am Umfangsrand greifen mehrere unterschiedlich ausgeformte Streckwalzen mit radialem Druck an der rotationssymmetrischen Umfangswand der Vorform an und werden entlang dieser, also in einer axialen Komponente während der Drehung der Vorform bewegt, wodurch einerseits eine Verdichtung des Materials erfolgt, andererseits dieses durch die sich im Wesentlichen in Achsrichtung bewegenden Streckwalzen gestreckt und damit verformt wird und eben bei Herstellung eines Metallrades zur Felge desselben. Am unteren Umfangsrand wird auf einem Absatz des Drehdorns das in der Regel innere Felgenhorn des zu bildenden Rades ausgebildet. Dieser Bearbeitungsvorgang, an sich ein Kaltverformungsvorgang, kann bei einer erhöhten Temperatur bis zu 350 °C vorgenommen werden, wobei zu beachten ist, dass alleine durch den Verformungsvorgang mittels der Streckwalzen eine Erwärmung ohnehin erfolgt. Derartige Verfahren sind grundsätzlich aus der US 2003/0145466 AI oder der ITVI20040061 A bekannt. Here, the preform of a wheel with a rotationally symmetrical sheath formation on a simple, rotating tool, a mandrel is placed, which is rotated with the preform in rotation. At the peripheral edge, a plurality of differently shaped drafting rollers engage with radial pressure on the rotationally symmetrical peripheral wall of the preform and are moved along this, ie in an axial component during the rotation of the preform, whereby on the one hand a compression of the material takes place, on the other hand by the substantially in Axes moving draw rollers stretched and thus deformed and just when producing a metal wheel to the rim of the same. At the lower peripheral edge of the generally inner rim flange of the wheel to be formed is formed on a shoulder of the rotary mandrel. This processing operation, in itself a cold-forming process, can be carried out at an elevated temperature of up to 350 ° C., wherein it should be noted that heating takes place anyway by the deformation process by means of the drafting rollers alone. Such methods are basically known from US 2003/0145466 AI or ITVI20040061 A.
Nachteilig ist, dass die innere oder Unterseite des herzustellenden Rades durch die Form des Spanndorns vorgegeben ist und der Umfangsrand des Felgenhorns gegebenenfalls nur in aufwändiger Weise durch Abfahren desselben mit den The disadvantage is that the inner or underside of the wheel to be produced is predetermined by the shape of the mandrel and the peripheral edge of the rim flange, where appropriate, only in a complex manner by moving the same down with the
Streckwalzen endgeformt werden kann, wozu einerseits kom- plizierte Steuerungsvorgänge der Bewegung erforderlich sind, andererseits das Spanndorn stören kann. Stretching rollers can be finally formed, on the one hand com- Planned control operations of the movement are required, on the other hand, the mandrel may interfere.
Der Erfindung liegt daher die Aufgabe zugrunde, ein gattungsgemäßes Verfahren und eine gattungsgemäße Vorrichtung zum Herstellen von Metallrädern dahingehend weiterzuentwickeln, dass insbesondere das innere Felgenhorn besser, schneller und weniger aufwändig ausgebildet werden kann. The invention is therefore based on the object to further develop a generic method and a generic device for producing metal wheels to the effect that in particular the inner rim flange can be made better, faster and less expensive.
Zur Lösung der Aufgabe ist eine erfindungsgemäße Vorrichtung gekennzeichnet durch unterhalb der Streckwalzen angeordnete, mit diesen zusammenwirkende frei drehbare Rollen. Ein erfindungsgemäßes Verfahren ist zur Lösung der Aufgabe dadurch gekennzeichnet, dass die Vorform von frei drehenden Rollen Untergriffen wird, die unter gleichen Umfangswinkeln wie die Streckwalzen um den Umfang der Vorform angeordnet sind, so dass die Streckwalzen durch Strecken von Vorform- material gegen die untergreifenden frei drehenden Rollen ein Felgenhorn ausbilden. To solve the problem, a device according to the invention is characterized by arranged below the draw rolls, cooperating with these freely rotatable rollers. An inventive method is to achieve the object characterized in that the preform of free-rotating rollers is under-gripped, which are arranged at the same circumferential angles as the draw rolls around the circumference of the preform, so that the draw rolls by stretching preform material against the under cross-exposed turning wheels to form a rim flange.
Die erfindungsgemäße Vorrichtung weist einen die Vorform des Rades aufnehmenden Spanndorn und Streckwalzen auf, die zunächst im äußeren Bereich (der zum Bearbeiten oben platziert ist) eines rotationssymmetrischen Mantels der Vorform angreifen. Die Streckwalzen sind bei radialer Druckausübung unter - radialer - Verdichtung und - axialer - Streckung - der Mantelwand entlang derselben bewegbar. Mittels der Streckwalzen wird so die Felge des Rades entlang des Spann- dorns endgeformt. The device according to the invention has a mandrel and draw rolls accommodating the preform of the wheel, which initially engage in the outer region (which is placed at the top for processing) of a rotationally symmetrical shell of the preform. The drafting rollers are under radial pressure exerting under - radial - compression and - axial - stretching - the shell wall along the same movable. By means of the drafting rollers, the rim of the wheel is finally shaped along the mandrel.
Der Spanndorn im Inneren der Vorform des Rades bzw. im In¬ neren des herzustellenden Rades ist ein rotationssymmetrischer Körper und weist keine Hinterschneidungen im Mantel- bereich auf; vorzugsweise erweitert sich der Spanndorn leicht konisch von der Außenseite des Rades zur Innenseite. The mandrel inside the preform of the wheel or in ¬ neren of the wheel to be produced is a rotationally symmetrical body and has no undercuts in the shell area on; Preferably, the mandrel widens slightly conically from the outside of the wheel to the inside.
Der Spanndorn muss daher nicht, wie dies bei Hinterschnei- dungen der Fall wäre, ein mehrteiliger Körper sein, dessen Einzelteile zum Entfernen des Rades von ihm dann durch zusätzliche hydraulische Befestigungselemente zurückgezogen werden müssten, was eine solche Werkzeugkonstruktion anfällig macht und auch die Präzision des Rads hinsichtlich der wichtigen Rundheit beeinträchtigen und Unwuchten verursa¬ chen kann. Der Spanndorn ragt innerhalb des herzustellenden Rades zur Innenseite bis auf die Höhe des inneren Felgenhorns, untergreift dieses aber nicht. Therefore, the mandrel does not have to be a multi-part body, as would be the case with undercuts, whose individual parts would then have to be retracted by additional hydraulic fasteners to remove the wheel, making such tool design vulnerable and also the precision of the wheel may affect in terms of the important roundness and unbalances verursa ¬ chen. The mandrel protrudes inside the produced wheel to the inside up to the height of the inner rim flange, but does not take this under.
Die erfindungsgemäße Vorrichtung ist so ausgebildet, dass zumindest eine der seitlich am Rad angreifenden Streckwalzen die (Flow-) Formung des Radmantels über seine gesamte Höhe vornehmen, einschließlich der Formung der Außenseite des inneren Felgenhorns. The device according to the invention is designed in such a way that at least one of the stretch rollers acting laterally on the wheel carries out the (flow) shaping of the wheel casing over its entire height, including the shaping of the outer side of the inner rim flange.
Die Umformung kann als Warm- oder auch als Kalt-Umformung erfolgen, wobei bei ersterer mit heißer Vorform und heißem Werkzeug gearbeitet wird, bei letzterer mit kalter Vorform und kaltem Werkzeug, die sich aufgrund des Bearbeitungsvorganges in gewisser Weise erwärmen. Ersteres wird insbesondere bei gegossenen Vorformen, letzteres bei geschmiedeten Vorformen eingesetzt. The forming can be done as a hot or as cold-forming, the former being used with hot preform and hot tool, the latter with cold preform and cold tool, which heat up due to the machining process in a way. The former is used in particular for cast preforms, the latter for forged preforms.
Eine erfindungsgemäße Vorrichtung kann weiterhin dadurch ausgestaltet sein, dass die frei drehenden Rollen eine unter Neigungswinkel von 50° bis 70° zu einer Drehachse der Vorform geneigte Drehachse haben, wobei insbesondere der Neigungswinkel der Drehachsen der frei drehenden Rollen zur Drehachse der Vorform einstellbar ist. A device according to the invention can furthermore be configured in that the freely rotating rollers have an axis of rotation inclined at an angle of inclination of 50 ° to 70 ° to a rotational axis of the preform, wherein in particular the Inclination angle of the axes of rotation of the freely rotating rollers to the axis of rotation of the preform is adjustable.
Weitere Ausbildungen der erfindungsgemäßen Vorrichtung sehen vor, dass die frei drehenden Rollen das zu bildende Felgenhorn mit ihrer Mantelwand untergreifen, wobei insbesondere die frei drehenden Rollen kegelstumpfförmig ausgebildet sind und/oder die Mantelwand der frei drehenden Rollen einen Winkel zwischen 20° und 40° zur Drehachse der frei drehenden Rollen einschließt. Auch kann eine ein Felgenhorn endformende Profilstreckwalze vorgesehen sein. Further embodiments of the device according to the invention provide that the freely rotating rollers engage the rim flange to be formed with its jacket wall, wherein in particular the freely rotating rollers are frusto-conical and / or the shell wall of the freely rotating rollers an angle between 20 ° and 40 ° to the axis of rotation which includes freely rotating rollers. Also, a rim end forming profile stretching roller can be provided.
Das erfindungsgemäße Verfahren sieht in Weiterbildung vor, dass die frei drehenden Rollen sich um Achsen drehen, die Neigungswinkel von 50° bis 70° zur Drehachse der Vorform einschließen, wobei insbesondere die frei drehenden Rollen den unteren Rand der Vorform mit ihrem Mantel untergreifen, der einen Winkel von 20° bis 40° zur Drehachse der frei drehenden Rollen einschließt. Insbesondere kann weiterhin vorgesehen sein, dass am zwischen Streckwalzen und frei drehenden Rollen ausgebildeten Felgenhorn unter radialer Druckausübung mindestens eine Profilstreckwalze zur Endformung des Felgenhorns angreift. Durch die Erfindung wird insbesondere die Möglichkeit zu einer zügigen, genauen und optimalen Ausbildung des inneren Felgenhorns eines Leichtmetallrads geschaffen. The inventive method provides in a development that the freely rotating rollers rotate about axes that include inclination angles of 50 ° to 70 ° to the axis of rotation of the preform, in particular, the free-rotating rollers engage under the lower edge of the preform with its coat, the one Includes angles of 20 ° to 40 ° to the rotation axis of the freely rotating rollers. In particular, it can furthermore be provided that at least one profile stretching roller for the final shaping of the rim flange engages under radial pressure exerted on the rim flange formed between draw rolls and freely rotating rolls. The invention provides in particular the possibility for a speedy, accurate and optimal design of the inner rim flange of a light metal wheel.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus den Ansprüchen und aus der nachfolgenden Beschreibung, in der ein Ausführungsbeispiel der Erfindung unter Bezugnahme auf die Zeichnung im Einzelnen erläutert ist. Dabei zeigt : eine Seitenansicht wesentlicher Teile einer erfindungsgemäßen Vorrichtung zum Herstellen eines Leichtmetallrades - ohne Profilstreckwalze; eine perspektivische Sicht von schräg oben auf ein Rad und wesentliche Teile der erfindungsgemäßen Vorrichtung (Profilstreckwalzen nicht sichtbar) ; eine Sicht auf die wesentlichen Merkmale der erfindungsgemäßen Vorrichtung perspektivisch von unten; und Fig. 4 eine Teilansicht entsprechend der Fig. Further advantages and features of the invention will become apparent from the claims and from the following description in which an embodiment of the invention with reference to the drawings is explained in detail. Showing: a side view of essential parts of an apparatus according to the invention for producing a light metal wheel - without profile stretching roller; a perspective view obliquely from above on a wheel and essential parts of the device according to the invention (profile stretching rollers not visible); a view of the essential features of the device according to the invention in perspective from below; and FIG. 4 shows a partial view corresponding to FIG.
1 mit am unteren oder inneren Felgenhorn angreifender Profilstreckwalze.  1 with on the lower or inner rim flange attacking profile stretch roller.
Die Fig. 1 und 4 zeigen ein Kraftfahrzeug-Metallrad 1 ge- strichelt als Vorform und durchgezeichnet mit seiner endgültigen Kontur in Schnittdarstellung (Fig. 4 lediglich in Teildarstellung) . Das Rad 1 weist eine Felge 1.1 sowie an seiner Außenseite la eine Radscheibe Teller- oder einen Speichenbereich 1.3 mit einer Nabe 1.4 auf. Im inneren Be- reich der Radscheibe 1.3 außerhalb der Nabe 1.4 sind Durchbrüche 1.5 zur Befestigung des Rades mittels Schrauben am Fahrzeug vorgesehen. Die Felge 1.1 weist ein äußeres Felgenhorn 1.6 nahe der Radscheibe 1.3 und ein inneres Felgenhorn 1.7, der Radscheibe 1.3 abgewandt, - an der Innenseite lb - auf. 1 and 4 show a motor vehicle metal wheel 1 dashed as a preform and drawn with its final contour in a sectional view (FIG. 4 only in partial representation). The wheel 1 has a rim 1.1 and on its outside la a wheel disc plate or a spoke area 1.3 with a hub 1.4. In the inner area of the wheel disc 1.3 outside of the hub 1.4, apertures 1.5 are provided for fastening the wheel by means of screws on the vehicle. The rim 1.1 has an outer rim flange 1.6 near the wheel disc 1.3 and an inner rim flange 1.7, facing away from the wheel disc 1.3, on the inner side 1b.
Während der äußere Bereich der Vorform 1.8, insbesondere Radscheibe oder Speichenbereich 1.3 der Endform sehr ange- nähert sind, erstreckt sich der Mantel der Vorform 1.8, insbesondere in seinem inneren Bereich radial deutlich über die Endkontur des Rades hinaus. Darüber hinaus erstreckt sich der Mantel bei der Vorform 1.8 in axialer Richtung nur über einen Teil der Höhe des fertigen Rades, vorzugsweise über 50 % bis 75 %. While the outer region of the preform 1.8, in particular the wheel disk or spoke area 1.3 of the final shape is very much are approaching, the shell of the preform 1.8, in particular in its inner region radially extends well beyond the final contour of the wheel out. Moreover, in the preform 1.8, the jacket extends in the axial direction only over part of the height of the finished wheel, preferably over 50% to 75%.
Weiterhin sind in den Fig. 1 bis 4 die wesentlichen Werkzeugelemente der erfindungsgemäßen Vorrichtung zum Herstellen eines solchen Metallrads, insbesondere Leichtmetallrads, aus der Vorform dargestellt, nämlich ein einfaches in die Vorform bzw. das Rad eingreifendes Werkzeug 2 in Form eines Spanndorns, mehrere an der Umfangswandung der Vorform bzw. des Rads angreifende unterschiedlich ausgebildete Streckwalzen 3, den unteren Rand des inneren bzw. unteren Felgenrands 1.5 des nahezu fertig gestellten Rades 1 untergreifende frei drehende Rollen 4 sowie mindestens eine Profilstreckwalze 5 (Fig. 3, 4). Von den Streckwalzen 3 ist lediglich die auf das Rad 1 zugerichtete Hälfte dargestellt. Die Streckwalzen 3 sind um jeweils eine sich im Wesentlichen vertikal erstreckende Drehachse drehbar. Furthermore, in Figs. 1 to 4, the essential tool elements of the device according to the invention for producing such a metal wheel, in particular light metal wheel, shown from the preform, namely a simple engaging in the preform or the wheel tool 2 in the form of a mandrel, several on the Peripheral wall of the preform or of the wheel attacking differently formed draw rolls 3, the lower edge of the inner or lower edge of the rim 1.5 of the almost finished wheel 1 under cross-freely rotating rollers 4 and at least one profile stretching roller 5 (Fig. 3, 4). Of the drafting rollers 3, only the directed to the wheel 1 half is shown. The draw rolls 3 are each rotatable about a substantially vertically extending axis of rotation.
Die Vorform des Rades 1 sitzt auf einem einfachen Werkzeug in Form eines als Rotationskörper ausgebildeten Spanndorns 2 auf, der die innere Form des Rades 1 bestimmt. Der Spanndorn 2 ist einstückig. Er weist im Umfangsbereich keine Hinterschneidungen auf und erweitert sich von der Außenseite la des Rades 1 zu seiner Innenseite lb leicht konisch, damit das fertig geformte Rad leicht vom Spanndorn 2 abgenommen werden kann. The preform of the wheel 1 is seated on a simple tool in the form of a clamping mandrel 2 designed as a rotary body, which determines the inner shape of the wheel 1. The mandrel 2 is in one piece. It has no undercuts in the peripheral region and widens slightly conically from the outer side 1a of the wheel 1 to its inner side 1b, so that the finished shaped wheel can be easily removed from the mandrel 2.
Am Außenumfang des Rades 1 greifen, über den Umfang insbesondere gleichmäßig verteilt, Streckwalzen 3 an, die, wie in der linksseitigen Überlagerungsdarstellung der Fig. 1 dargestellt, unterschiedlich ausgebildet sein können. Sie greifen zunächst im oberen Bereich der Vorform des Rades 1 an, üben dabei einen axialen Druck aus und fahren gleichzeitig entlang der Vorform des Rades nach unten, wobei sie durch die Druckausübung den späteren Radmantel oder die eigentliche Felge 1.1 des Rades 1 bildenden Teil 1.8 die Vor- form des Rades nach unten strecken und gleichzeitig verdichten . On the outer circumference of the wheel 1 engage, over the circumference in particular evenly distributed, stretching rollers 3, which, as shown in the left-side overlay representation of FIG. 1, may be formed differently. They first attack in the upper part of the preform of the wheel 1, while exerting an axial pressure and at the same time go along the preform of the wheel down, being the pressure exerted by the later wheel casing or the actual rim 1.1 of the wheel 1 forming part 1.8 Stretch the preform of the wheel downwards and compact it at the same time.
Die Vorform des Rades 1 bzw. das Rad 1 werden einerseits durch den Spanndorn 2 getragen. Dieser erstreckt sich über die gesamte Höhe des herzustellenden Rades bis zur axialen Höhe des inneren Felgenhorns 1.7, untergreift allerdings nicht den Rand, das spätere innere Felgenhorn 1.7 des Rades. Dieser. wird vielmehr durch zusätzliche frei laufende Rollen 4 untergriffen. Vorzugsweise sind drei Rollen angeordnet, die gleichmäßig über den Umfang verteilt vorgesehen sind und zwar jeweils unter einer Streckwalze 3. The preform of the wheel 1 and the wheel 1 are supported on the one hand by the mandrel 2. This extends over the entire height of the wheel to be produced up to the axial height of the inner rim flange 1.7, but does not reach under the edge, the later inner rim flange 1.7 of the wheel. This one . Rather, it is underrun by additional free-running rollers 4. Preferably, three rollers are arranged, which are provided distributed uniformly over the circumference, in each case under a draw roller. 3
Zusätzlich ist, wie der Fig. 3 und insbesondere der Fig. 4 zu entnehmen ist, seitlich im Bereich des zu bildenden inneren Felgenhorns 1.7 umfangsmäßig zwischen zwei frei laufenden Walzen 4 zumindest eine Profilstreckwalze 5 vorgesehen, die durch radiale Druckausübung in ihrer am Umfang vorgesehen Profilnut 5.1 das Profil des inneren Felgenhorns 1.7 endformt. Die frei drehenden Rollen 4 sind, wie aus der Fig. 1 ersichtlich ist, mit ihrer Drehachse 4.1 zur Drehachse 2.1 des Spanndorns 2 und damit des auf diesen drehfest aufsitzenden Rades 1 unter einem Winkel α von etwa 60° ausgerichtet. Die frei 'drehenden Rollen 4 sind kegelstumpf- förmig ausgebildet und verjüngen sich von ihrer Unterseite zur Oberseite hin, wobei die Mantelwand 4.2 einen Winkel von 20 bis 30° zur Drehachse 4.1 einschließt. Die frei drehenden Rollen 4 greifen mit ihrer Mantelwand an der Innen- Unterseite des Rades 1 t zur Ausbildung des inneren Felgenhorns 1.7 an. Die Drehachse der frei drehenden Rollen 4.1 ist in einem gewissen Grad frei einstellbar, beispielsweise zwischen 50 und 70° relativ zur Drehachse 2.1 des Spanndorns 2, so dass hierdurch die innere Stirnseite des inneren Felgenhorns 1.7 durch den Anstellwinkel der Drehachse 4.1 eingestellt werden kann. In addition, as can be seen in FIG. 3 and in particular in FIG. 4, at least one profile stretching roller 5 is provided laterally in the area of the inner rim flange 1.7 to be formed circumferentially between two freely running rollers 4, which profile groove is provided by radial pressure exertion in its profile groove provided on the circumference 5.1 the profile of the inner rim flange 1.7 finishes. The freely rotating rollers 4 are, as shown in FIG. 1 can be seen, with its axis of rotation 4.1 to the axis of rotation 2.1 of the mandrel 2 and thus of the rotationally fixed seated wheel 1 at an angle α of about 60 ° aligned. The freely rotating rollers 4 are truncated cone-shaped and taper from their lower side toward the upper side, wherein the lateral wall 4.2 forms an angle from 20 to 30 ° to the axis of rotation 4.1 includes. The freely rotating rollers 4 engage with their mantle wall on the inner underside of the wheel 1 t to form the inner rim flange 1.7. The axis of rotation of the freely rotating rollers 4.1 is freely adjustable to a certain extent, for example between 50 and 70 ° relative to the axis of rotation 2.1 of the mandrel 2, so that in this way the inner end face of the inner rim flange 1.7 can be adjusted by the angle of rotation of the axis 4.1.
Der Herstellungsablauf ist im Wesentlichen der folgende: The manufacturing process is essentially the following:
Zunächst wird die Vorform des Rades 1 gegossen und von Anschlusszapfen befreit. Anschließend wird die Vorform auf den Spanndorn 2 aufgespannt und kann erhitzt werden, idealerweise nicht bis über 350°C. Sodann verfahren die Streckwalzen 3 im oberen Bereich der Vorform gegen dieselbe und bewegen sich unter Ausübung von radialem Druck vom äußeren Felgenhorn 1.6 nach unten zum inneren Felgenhorn 1.7 und formen dabei die Felge 1.1 und im Wesentlichen die Felgenhörner 1.6, 1.7. Dabei wird das Material des Mantels des Rades einerseits zur Ausbildung der Felge nach unten in den Bereich des inneren Felgenhorns 1.7 gezogen, also gestreckt, zum anderen das Material des Rades verdichtet. Sobald durch die Streckwalzen 3 das Mantelmaterial des Rades bis unter die Unterkante des Spanndorns 2 gestreckt wurde, greifen dort die frei drehenden Walzen 4 mit ihrer Mantelwand 4.2 an, während die Profilstreckwalze 4.5 in den Zwischenraum zwischen zwei frei drehenden Walzen 4 eingreift, radialen Druck ausübt und in ihrer Profilnut 5.1 das innere Felgenhorn 1.7 aus- und endformt. Bezugszeichenliste First, the preform of the wheel 1 is poured and freed from connecting pin. Subsequently, the preform is clamped on the mandrel 2 and can be heated, ideally not to above 350 ° C. Then, the drafting rollers 3 move in the upper region of the preform against the same and move under the exertion of radial pressure from the outer rim flange 1.6 down to the inner rim flange 1.7, thereby forming the rim 1.1 and essentially the rim flanges 1.6, 1.7. The material of the shell of the wheel is pulled on the one hand to form the rim down in the region of the inner rim flange 1.7, so stretched, on the other hand compacts the material of the wheel. As soon as the jacket material of the wheel has been stretched to below the lower edge of the mandrel 2 by the drafting rollers 3, the freely rotating rollers 4 attack there with their jacket wall 4.2, while the profile stretching roller 4.5 engages in the space between two freely rotating rollers 4, exerts radial pressure and in its profile groove 5.1, the inner rim flange 1.7 ausform and endformt. LIST OF REFERENCE NUMBERS
1 Kraftfahrzeug-Metallrad la Außenseite des Rads 1 motor vehicle metal wheel la outside of the wheel
lb Innenseite des Rads lb inside of the wheel
1.1 Felge 1.1 rim
1.3 Teller- oder Speichenbereich 1.3 Plate or spoke area
1.3 Radscheibe 1.3 Wheel disc
1.4 Nabe  1.4 hub
1.5 Felgenrand / Durchbrüche 1.6 äußeres Felgenhorn  1.5 rim edge / breakthroughs 1.6 outer rim flange
1.7 inneres Felgenhorn  1.7 inner rim flange
1.8 Teil  1.8 part
2 Werkzeug / Spanndorn  2 tool / mandrel
2.1 Drehachse 2.1 rotation axis
3 Streckwalze 3 draw roller
4 frei drehende Rollen  4 freely rotating rollers
.1 Drehachse  .1 rotation axis
4.2 Mantelwandung  4.2 jacket wall
4.5 Profilstreckwalze 4.5 profile stretching roller
5 Profilstreckwalze 5 profile stretching roller
5.1 Profilnut  5.1 profile groove
14 14

Claims

Patentansprüche claims
1. Vorrichtung zum Herstellen eines Leicht-Metallrades (1) aus einer Vorform, mit am Felgenbereich der Vorform angreifenden Streckwalzen (3) , mittels derer eine Felge (1.1) des Rades (1) endgeformt wird, dadurch gekennzeichnet, dass unterhalb der Streckwalzen (3) frei drehbare Rollen (4) zur Ausbildung eines inneren Felgenhorns (1.7) angeordnet sind, dass die frei drehbaren Rollen (4), die Vorform insbesondere im Bereich des zu bildenden Felgenhorns (1.7) mit ihrer Mantelwand (4.2) untergreifen und dass die Streckwalzen unter Strecken von Vorformmaterial gegen die frei drehbaren Rollen (4) mit diesen zur Ausbildung eines inneren Felgenhorns (1.7) des Rades (1) zusammenwirken. 1. Apparatus for producing a lightweight metal wheel (1) from a preform, with stretching rollers (3) acting on the rim region of the preform, by means of which a rim (1.1) of the wheel (1) is finally formed, characterized in that below the draw rollers ( 3) freely rotatable rollers (4) for forming an inner rim flange (1.7) are arranged, that engage the freely rotatable rollers (4), the preform in particular in the region of the rim flange to be formed (1.7) with its jacket wall (4.2) and that the Stretching rollers under stretching of preform material against the freely rotatable rollers (4) with these to form an inner rim flange (1.7) of the wheel (1) cooperate.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die frei drehenden Rollen (4) eine unter Neigungswinkel (ex) von 50° bis 70° zu einer Drehachse (2.1) der Vorform geneigte Drehachse (4.1) haben. 2. Device according to claim 1, characterized in that the freely rotating rollers (4) have a tilt angle (ex) of 50 ° to 70 ° to a rotation axis (2.1) of the preform inclined axis of rotation (4.1).
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Neigungswinkel (a) der Drehachsen (4.1) der 3. A device according to claim 2, characterized in that the inclination angle (a) of the axes of rotation (4.1) of
10 frei drehenden Rollen zur Drehachse (2.1) der Vorform einstellbar ist. 10 freely rotating rollers to the axis of rotation (2.1) of the preform is adjustable.
4. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die frei drehenden Rollen (4) das zu bildende Felgenhorn (1.7) mit ihrer Mantelwand (4.2) untergreifen. 4. Device according to one of the preceding claims, characterized in that the freely rotating rollers (4) engage under the rim flange (1.7) to be formed with its jacket wall (4.2).
5. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die frei drehenden Rollen (4) kegelstumpfförmig ausgebildet sind. 5. Device according to one of the preceding claims, characterized in that the freely rotating rollers (4) are frusto-conical.
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die Mantelwand (4.2) der frei drehenden Rollen (4) einen Winkel zwischen 20° und 40° zur Drehachse (4.1) der frei drehenden Rollen (4) einschließt. 6. Apparatus according to claim 5, characterized in that the jacket wall (4.2) of the freely rotating rollers (4) forms an angle between 20 ° and 40 ° to the axis of rotation (4.1) of the freely rotating rollers (4).
7. Vorrichtung nach einem der vorangehenden Ansprüche, gekennzeichnet durch zumindest eine ein Felgenhorn (1.7) endformende Profilstreckwalze (5). 7. Device according to one of the preceding claims, characterized by at least one rim flange (1.7) endformende profile stretching roller (5).
8. Verfahren zum Herstellen eines Metallrades aus einer Vorform, wobei die Vorform des herzustellenden Metallrades (1) auf einen Spanndorn (2) aufgesetzt und in Drehung versetzt wird, im oberen Bereich eines rotationssymmetrischen Mantels der Vorform Streckwalzen (3) unter radialer Druckausübung angreifen und sich entlang der Mantelwand der Vorform unter Verdichtung und Streckung der Mantelwand zu einer Felge mit einer Hauptbewegungskomponente parallel zur Drehachse (2.1) der Vorform bewegen, dadurch gekennzeichnet, dass die Vorform von Mantelwän- 8. A method for producing a metal wheel from a preform, wherein the preform of the metal wheel to be produced (1) is placed on a mandrel (2) and set in rotation, in the upper region of a rotationally symmetrical shell of the preform stretching rollers (3) attack under radial pressure and moving along the mantle wall of the preform under compression and stretching of the mantle wall to a rim with a main motion component parallel to the axis of rotation (2.1) of the preform, characterized in that the preform of mantle wall
11 den (4.2) frei drehender Rollen (4) Untergriffen wird, die unter gleichen Umfangswinkeln wie die Streckwalzen (3) um den Umfang der Vorform angeordnet sind, und dass die Streckwalzen (3) zusammen mit den frei drehenden Rollen (4) durch Strecken von Vorformmaterial gegen die untergreifenden frei drehenden Rollen (4), ein inneres Felgenhorn (1.7) ausbilden. 11 the (4.2) freely rotating rollers (4) are under the same circumferential angles as the draw rolls (3) arranged around the circumference of the preform, and that the draw rolls (3) together with the freely rotating rollers (4) by stretching Preforming material against the undercutting freely rotating rollers (4), an inner rim flange (1.7) form.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, dass die frei drehenden Rollen (4) sich um Achsen drehen, die Neigungswinkel von 50° bis 70° zur Drehachse (2.1) der Vorform einschließen. 9. The method according to claim 8, characterized in that the freely rotating rollers (4) rotate about axes, the inclination angle of 50 ° to 70 ° to the axis of rotation (2.1) include the preform.
Verfahren nach Anspruch 8 oder 9, dadurch gekennzeich net, dass die frei drehenden Rollen (4) den unteren Rand der Vorform mit ihrem Mantel (4.2) untergreifen, der einen Winkel von 20° bis 40° zur Drehachse (4.1) der frei drehenden Rollen (4) einschließt. 11. Verfahren nach einem der Ansprüche 8 bis 10, dadurch gekennzeichnet, dass am zwischen Streckwalzen (3) und frei drehenden Rollen (4) ausgebildeten Felgenhorn (1.7) unter radialer Druckausübung mindestens eine Profilstreckwalze (5) zur Endformung des Felgenhorns (1.7) angreift. A method according to claim 8 or 9, characterized in that the freely rotating rollers (4) engage under the lower edge of the preform with its jacket (4.2) at an angle of 20 ° to 40 ° to the rotation axis (4.1) of the freely rotating rollers (4). 11. The method according to any one of claims 8 to 10, characterized in that between the drafting rollers (3) and freely rotating rollers (4) formed rim flange (1.7) under radial pressure at least one profile stretching roller (5) for the final shaping of the rim flange (1.7) engages ,
12 12
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DE502005000979D1 (en) 2005-04-18 2007-08-16 Repkon Machine And Tool Indust Method of forming a groove

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DE102011117034A1 (en) 2013-05-02
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PL3189909T3 (en) 2021-05-31
DE102011117034B4 (en) 2015-09-17
WO2013060451A8 (en) 2014-05-01
ES2854401T3 (en) 2021-09-21
HUE032294T2 (en) 2017-09-28
PT2771137T (en) 2017-05-15
US20140283572A1 (en) 2014-09-25
US9573179B2 (en) 2017-02-21
TWI600482B (en) 2017-10-01
EP3189909A1 (en) 2017-07-12
TW201338889A (en) 2013-10-01
PL2771137T3 (en) 2017-08-31
EP2771137B1 (en) 2017-03-15
EP3189909B1 (en) 2020-12-02
HUE053016T2 (en) 2021-06-28

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