EP2771137B1 - Combination of a preform and device and method for producing a lightweight metal wheel - Google Patents

Combination of a preform and device and method for producing a lightweight metal wheel Download PDF

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Publication number
EP2771137B1
EP2771137B1 EP12818482.7A EP12818482A EP2771137B1 EP 2771137 B1 EP2771137 B1 EP 2771137B1 EP 12818482 A EP12818482 A EP 12818482A EP 2771137 B1 EP2771137 B1 EP 2771137B1
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EP
European Patent Office
Prior art keywords
preform
wheel
jacket
rotating rollers
freely rotating
Prior art date
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EP12818482.7A
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German (de)
French (fr)
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EP2771137A1 (en
Inventor
Giorgio MUFFATTO
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RONAL AG
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RONAL AG
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Application filed by RONAL AG filed Critical RONAL AG
Priority to PL12818482T priority Critical patent/PL2771137T3/en
Priority to PL16002381T priority patent/PL3189909T3/en
Priority to EP16002381.8A priority patent/EP3189909B1/en
Publication of EP2771137A1 publication Critical patent/EP2771137A1/en
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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 combination of a device and a preform for producing a light metal wheel from the preform and a method for producing a light metal wheel from a preform.
  • the invention relates to the production of light-alloy wheels, in particular made of aluminum or aluminum alloy by means of flow forming. 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 term is to 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.
  • 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 compaction of the material takes place, on the other hand, this stretched by the substantially axially extending draw rolls and thus deformed and just when producing a metal wheel for 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 from the US 2003/0145466 A1 or the ITVI20040061 A known.
  • 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 can be optionally formed only in a complex manner by traversing the same with the drafting rollers, including the one hand complicated control operations of movement are required, on the other hand, the mandrel can disturb.
  • the EP 1 712 310 and the EP 1 714 714 A1 relate to the molding of a snap ring groove in the manufacture of oblique shoulder rims for trucks.
  • rims are usually processed in a flow-forming process.
  • a rim blank which is usually from a rounded to a hollow cylinder and butt welded sheet metal strip, so that steel, deformed by pressing of pressure rollers.
  • the workpiece is set in rotation about its longitudinal axis.
  • the molding is carried out by deforming a groove and then by means of a - attacking from the inside - element element substantially away from the longitudinal axis of forming the end portion of the workpiece to a - provided on the outside of the workpiece wall - a predetermined groove profile exhibiting counter element. So here it takes place only a reshaping of the metal strip in the region of the snap ring groove to be formed to this.
  • the DE 2 053 005 and the DE 2 231 842 relate to methods and apparatus for producing Schrägschulterfelgen itself (as they are then provided according to the aforementioned publications with a groove).
  • the flowforming process was not yet available.
  • the DE 103 22 752 A1 relates to a method for producing workpieces made of sheet metal with at least one branch by a forming process, among other things, rims for motor vehicles are addressed. But even here it is only about the pure forming to the effect that in the area of a previously introduced bending point by means of an attacking forming roller (2-2c) at least one weg josder from the sheet plane flange is formed from the sheet, with areas of this flange fastened differently, so compressed should be and thus have different strength in the final product. An axial stretching along the wall of the metal jacket does not take place here either.
  • the WO 2005/065049 A2 refers to the production of a one-piece steel wheel.
  • the process is multi-level and the individual stages are carried out in different form-changing processing stages.
  • a short cylinder jacket wall is radially perpendicular over a cylindrical mandrel by radially pressurizing and axially moving rollers.
  • a retracted into the interior of the cylinder barrel contoured other mandrel on this the shaping of the rim and its individual sections made by other rollers, which are also each in their working section (rim 3, tire seat 2 and 4) must move axially restricted.
  • the formation of the inner and outer rim flange (these two stages are preceded by further steps in turn other tools). It is essential that the rim flange is not formed by a roller in the first-mentioned stage of the stretching, but between only radially against each other engaging rollers / rollers is formed, although a non-working feed movement and the two rollers but only working radially against each oppressive.
  • the DE 1 452 610 relates to a method of forming an outwardly opening groove on a cylindrical tube.
  • the tube is stretched in a first step by means of a first roller along the cylindrical portion of a mandrel, which has a taper at one end.
  • a tailstock cushion and another roll To form the actual groove at the free end of the tube engage radially from the inside and from outside the taper of the mandrel, a tailstock cushion and another roll.
  • stretching and forming processes are separated and carried out by different tools.
  • the invention has for its object to provide a method and a combination of a device and a preform for the manufacture of light-alloy wheels, which form the inner rim flange better, faster and less expensive while optimizing the production.
  • the invention provides a combination according to the invention of a device and a preform with the features of claim 1 and a method according to the invention with the features of claim 8.
  • the device of the combination of a device and a preform according to the invention comprises 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 machining) of a rotationally symmetric 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 so the rim of the wheel along the mandrel is finally formed.
  • the mandrel inside the preform of the wheel or in the interior of the wheel to be produced is a rotationally symmetrical body and has no undercuts in the shell region, preferably the mandrel widens slightly conically from the outside of the wheel to the inside.
  • the mandrel must therefore not, as would be the case with undercuts, a multi-part body whose items would have to be removed to remove the wheel from him by additional hydraulic fasteners, which makes such a tool design vulnerable and also the precision of the wheel in terms of can affect important roundness and cause imbalance.
  • 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 of the combination according to the invention is designed such that at least one of the stretch rollers acting on the side of the wheel makes the (flow) shaping of the wheel jacket 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 of the combination according to the invention can also be configured in that the freely rotating rollers have an inclined at an angle of 50 ° to 70 ° to a rotational axis of the preform rotation axis, 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 , Further embodiments of the device according to the invention provide that the freely rotating rollers to be formed rim flange with its jacket wall engage below, in particular, the freely rotating rollers are frusto-conical and / or the shell wall of the freely rotating rollers forms an angle between 20 ° and 40 ° to the axis of rotation of the 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 angle 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.
  • the Fig. 1 and 4 show a motor vehicle metal wheel 1 dashed as a preform and traced with its final contour in section ( Fig. 4 only in partial representation).
  • the wheel 1 has a rim 1.1 and on its outside 1a a wheel disc or a spoke area 1.3 with a hub 1.4. In the inner region of the wheel disc 1.3 outside the hub 1.4 breakthroughs 1.5 are provided for attachment of 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 inside 1b.
  • the jacket of the preform of the combination according to the invention extends radially, in particular in its inner region, clearly beyond the final contour of the wheel.
  • the jacket extends in the axial direction only over part of the height of the finished wheel, preferably over 50% to 75%.
  • 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 On the outer circumference of the wheel 1 engage, in particular evenly distributed over the circumference, stretching rollers 3, which, as in the left-side overlay representation of Fig. 1 represented, may be formed differently. They first attack in the upper part of the preform of the wheel 1, while exerting a radial pressure and at the same time travel along the preform of the wheel down, where they are the later Radmantel or the actual by the pressure exerted Rim 1.1 of the wheel 1 forming part 1.8 stretch the preform of the wheel down and compact at the same time.
  • the preform of the wheel 1 or the wheel 1 is 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 is rather underrun by additional free-running roles 4.
  • three rollers are arranged, which are provided distributed uniformly over the circumference, in each case under a draw roller. 3
  • Fig. 3 laterally provided in the region of the inner rim flange 1.7 to be formed circumferentially between two free-running rollers 4 at least one profile stretching roller 5, the profile of the inner rim flange 1.7 by radial pressure exerted in its circumferential groove provided on the profile 5.1.
  • the three rotating rollers 4 are, as from the Fig. 1 it can be seen with its axis of rotation 4.1 to the axis of rotation 2.1 of the mandrel 2 and thus the rotationally fixed seated wheel 1 at an angle ⁇ of about 60 ° aligned.
  • the freely rotating rollers 4 are formed frusto-conical and taper from its bottom to the top, wherein the jacket wall 4.2 forms an angle of 20 ° to 30 ° to the axis of rotation 4.1.
  • the freely rotating rollers 4 engage with their jacket wall on the inside underside of the wheel 1 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 degree, for example, between 50 ° and 70 ° relative to the axis of rotation of the 2.1 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 attack of the axis of rotation 4.1.

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

Description

Die Erfindung betrifft eine Kombination einer Vorrichtung und einer Vorform zum Herstellen eines Leichtmetallrades aus der Vorform und ein Verfahren zum Herstellen eines Leichtmetallrades aus einer Vorform. Die Erfindung bezieht sich auf das Herstellen von Leichtmetallrädern insbesondere 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 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. 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 A1 oder der ITVI20040061 A bekannt.The invention relates to a combination of a device and a preform for producing a light metal wheel from the preform and a method for producing a light metal wheel from a preform. The invention relates to the production of light-alloy wheels, in particular made of aluminum or aluminum alloy by means of flow forming. 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 term is to 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. 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 compaction of the material takes place, on the other hand, this stretched by the substantially axially extending draw rolls and thus deformed and just when producing a metal wheel for 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 from the US 2003/0145466 A1 or the ITVI20040061 A known.

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 Streckwalzen endgeformt werden kann, wozu einerseits komplizierte Steuerungsvorgänge der Bewegung erforderlich sind, andererseits das Spanndorn stören kann.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 can be optionally formed only in a complex manner by traversing the same with the drafting rollers, including the one hand complicated control operations of movement are required, on the other hand, the mandrel can disturb.

Die EP 1 712 310 und die EP 1 714 714 A1 betreffen das Anformen einer Sprengringnut bei der Fertigung von Schrägschulterfelgen für Lastkraftwagen. Derartige Felgen werden üblicherweise in einem Drückwalzprozess bearbeitet. Hierzu wird ein Felgenrohling, der in Regel aus einem zu einem Hohlzylinder gerundeten und stumpf geschweißten Blechstreifen, damit aus Stahl, besteht, durch Andrücken von Drückwalzen verformt. Zum Anformen der Sprengringnut wird das Werkstück in Drehung um seine Längsachse versetzt. Das Anformen erfolgt durch Verformen einer Nut und anschließendes mittels eines - von der Innenseite her angreifenden - Formelements im Wesentlichen von der Längsachse weg erfolgendes Umformen des Endbereichs des Werkstücks um ein - außen an der Werkstückwand vorgesehenes - ein vorgegebenes Nutprofil aufweisendes Gegenelement. Es erfolgt hier also lediglich ein Umformen des Blechstreifens im Bereich der zu formenden Sprengringnut zu dieser.The EP 1 712 310 and the EP 1 714 714 A1 relate to the molding of a snap ring groove in the manufacture of oblique shoulder rims for trucks. Such rims are usually processed in a flow-forming process. For this purpose, a rim blank, which is usually from a rounded to a hollow cylinder and butt welded sheet metal strip, so that steel, deformed by pressing of pressure rollers. To form the snap ring groove, the workpiece is set in rotation about its longitudinal axis. The molding is carried out by deforming a groove and then by means of a - attacking from the inside - element element substantially away from the longitudinal axis of forming the end portion of the workpiece to a - provided on the outside of the workpiece wall - a predetermined groove profile exhibiting counter element. So here it takes place only a reshaping of the metal strip in the region of the snap ring groove to be formed to this.

Die DE 2 053 005 und die DE 2 231 842 betreffen Verfahren und Vorrichtung zur Herstellung von Schrägschulterfelgen an sich (wie sie dann nach den vorgenannten Druckschriften mit einer Nut versehen werden). Hier greifen ebenfalls im Betrieb axial feste Werkzeuge an der Mantelwand des herzustellenden Rads an und insbesondere - ebenso wie bei den vorgenannten Druckschriften - Profilrollen 14, 15 von innen am unteren Bereich der Mantelwandung zur Herstellung des Felgenhorns. Zum Zeitpunkt der beiden vorstehend genannten Druckschriften gab es das Flowforming-Verfahren noch nicht.The DE 2 053 005 and the DE 2 231 842 relate to methods and apparatus for producing Schrägschulterfelgen itself (as they are then provided according to the aforementioned publications with a groove). Here also in operation axially fixed tools on the jacket wall of the wheel to be produced and in particular - as well as in the aforementioned document - profile rollers 14, 15 from the inside at the bottom of the jacket wall for the production of the rim flange. At the time of the above two references, the flowforming process was not yet available.

Die DE 103 22 752 A1 betrifft ein Verfahren zum Herstellen von Werkstücken aus Blech mit mindestens einer Verzweigung durch einen Umformvorgang, wobei unter anderem auch Felgen für Kraftfahrzeuge angesprochen sind. Aber auch hier geht es lediglich um das reine Umformen dahingehend, dass im Bereich einer zuvor eingebrachten Biegestelle mittels einer angreifenden Umformwalze (2-2c) mindestens ein von der Blechebene wegweißender Flansch aus dem Blech geformt wird, wobei Bereiche dieses Flansches unterschiedlich befestigt, also komprimiert werden sollen und damit am Endprodukt unterschiedliche Stärke aufweisen. Ein axiales Strecken entlang der Wandung des Blechmantels erfolgt hier ebenfalls nicht.The DE 103 22 752 A1 relates to a method for producing workpieces made of sheet metal with at least one branch by a forming process, among other things, rims for motor vehicles are addressed. But even here it is only about the pure forming to the effect that in the area of a previously introduced bending point by means of an attacking forming roller (2-2c) at least one wegweisender from the sheet plane flange is formed from the sheet, with areas of this flange fastened differently, so compressed should be and thus have different strength in the final product. An axial stretching along the wall of the metal jacket does not take place here either.

Die WO 2005/065049 A2 bezieht sich auf die Herstellung eines einstückigen Stahlrades. Das Verfahren ist mehrstufig und die einzelnen Stufen werden in verschiedene formändernden Bearbeitungsstufen durchgeführt. Zunächst wird in einem ersten Werkzeug eine kurze Zylindermantelwandung durch radial druckausübende und sich axial bewegende Walzen/Rollen ber einem zylindrischen Mandrel senkrecht. Anschließend werden in einem weiteren Schritt in einem anderen Werkzweug über einem ins Innere des Zylindermantels eingefahrenen konturierten anderen Mandrel auf diesem die Formbildung der Felge und deren einzelner Abschnitte mittels anderer Walzen vorgenommen, die sich dabei auch jeweils in ihrem Arbeitsabschnitt (Felgenbett 3, Reifensitz 2 und 4) beschränkt axial bewegen müssen. Unabhängig von der Ausbildung des ursprünglichen Felgenbettes erfolgt weiterhin durch andere Rollen die Ausbildung des inneren und äußeren Felgenhorns (diese beiden Stufen sind weitere Arbeitsschritte in wiederum anderen Werkzeugen vorgeordnet). Wesentlich ist, dass dass das Felgenhorn nicht durch eine in der erstgenannten Stufe der Strecken bewirkenden Walze geformt wird, sondern zwischen lediglich radial gegeneinander angreifenden Walzen/Rollen gebildet wird, wobei zwar eine nicht arbeitende Zustellbewegung und die beiden Rollen aber lediglich radial gegeneinander drückend arbeiten.The WO 2005/065049 A2 refers to the production of a one-piece steel wheel. The process is multi-level and the individual stages are carried out in different form-changing processing stages. First, in a first tool, a short cylinder jacket wall is radially perpendicular over a cylindrical mandrel by radially pressurizing and axially moving rollers. Subsequently, in another step in another Werkzweug about a retracted into the interior of the cylinder barrel contoured other mandrel on this the shaping of the rim and its individual sections made by other rollers, which are also each in their working section (rim 3, tire seat 2 and 4) must move axially restricted. Regardless of the formation of the original rim bed continues to be made by other roles, the formation of the inner and outer rim flange (these two stages are preceded by further steps in turn other tools). It is essential that the rim flange is not formed by a roller in the first-mentioned stage of the stretching, but between only radially against each other engaging rollers / rollers is formed, although a non-working feed movement and the two rollers but only working radially against each oppressive.

Die DE 1 452 610 betrifft ein Verfahren zur Bildung einer sich nach außen öffnenden Hohlkehle an einem zylindrischem Rohr. Hierzu wird das Rohr in einem ersten Schritt mittels einer ersten Rolle entlang dem zylindrischen Bereich eines Mandrels gestreckt, der an seinem einen Ende eine Verjüngung aufweist. Zur Ausbildung der eigentlichen Hohlkehle greifen am freien Ende des Rohres radial von innen und von außen neben der Verjüngung des Mandrels ein Reitstockkissen und eine andere Rolle an. Auch hier sind also Streck- und Formvorgänge getrennt und werden durch unterschiedliche Werkzeuge ausgeführt.The DE 1 452 610 relates to a method of forming an outwardly opening groove on a cylindrical tube. For this purpose, the tube is stretched in a first step by means of a first roller along the cylindrical portion of a mandrel, which has a taper at one end. To form the actual groove at the free end of the tube engage radially from the inside and from outside the taper of the mandrel, a tailstock cushion and another roll. Here, too, stretching and forming processes are separated and carried out by different tools.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren und eine Kombination einer Vorrichtung und einer Vorform zum Herstellen von Leichtmetallrädern zu schaffen, die unter Optimierung der Fertigung insbesondere das innere Felgenhorn besser, schneller und weniger aufwändig ausbilden.The invention has for its object to provide a method and a combination of a device and a preform for the manufacture of light-alloy wheels, which form the inner rim flange better, faster and less expensive while optimizing the production.

Zur Lösung der Aufgabe sieht die Erfindung eine erfindungsgemäße Kombination einer Vorrichtung und einer Vorform mit den Merkmalen des Anspruchs 1 und ein erfindungsgemäßes Verfahren mit den Merkmalen des Anspruchs 8 vor.To achieve the object, the invention provides a combination according to the invention of a device and a preform with the features of claim 1 and a method according to the invention with the features of claim 8.

Die Vorrichtung der erfindungsgemäßen Kombination einer Vorrichtung und einer Vorform 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 Spanndorns endgeformt.The device of the combination of a device and a preform according to the invention comprises 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 machining) of a rotationally symmetric 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 so the rim of the wheel along the mandrel is finally formed.

Der Spanndorn im Inneren der Vorform des Rades bzw. im Inneren des herzustellenden Rades ist ein rotationssymmetrischer Körper und weist keine Hinterschneidungen im Mantelbereich 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 the interior of the wheel to be produced is a rotationally symmetrical body and has no undercuts in the shell region, preferably the mandrel widens slightly conically from the outside of the wheel to the inside.

Der Spanndorn muss daher nicht, wie dies bei Hinterschneidungen 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 verursachen kann. Der Spanndorn ragt innerhalb des herzustellenden Rades zur Innenseite bis auf die Höhe des inneren Felgenhorns, untergreift dieses aber nicht.The mandrel must therefore not, as would be the case with undercuts, a multi-part body whose items would have to be removed to remove the wheel from him by additional hydraulic fasteners, which makes such a tool design vulnerable and also the precision of the wheel in terms of can affect important roundness and cause imbalance. 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 Vorrichtung der erfindungsgemäßen Kombination 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 of the combination according to the invention is designed such that at least one of the stretch rollers acting on the side of the wheel makes the (flow) shaping of the wheel jacket 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 Vorrichtung der erfindungsgemäßen Kombination 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. 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.A device of the combination according to the invention can also be configured in that the freely rotating rollers have an inclined at an angle of 50 ° to 70 ° to a rotational axis of the preform rotation axis, 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 , Further embodiments of the device according to the invention provide that the freely rotating rollers to be formed rim flange with its jacket wall engage below, in particular, the freely rotating rollers are frusto-conical and / or the shell wall of the freely rotating rollers forms an angle between 20 ° and 40 ° to the axis of rotation of the 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 angle 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:

Fig. 1
eine Seitenansicht wesentlicher Teile einer erfindungsgemäßen Vorrichtung zum Herstellen eines Leichtmetallrades - ohne Profilstreckwalze;
Fig. 2
eine perspektivische Sicht von schräg oben auf ein Rad und wesentliche Teile der erfindungsgemäßen Vorrichtung (Profilstreckwalzen nicht sichtbar);
Fig. 3
eine Sicht auf die wesentlichen Merkmale der erfindungsgemäßen Vorrichtung perspektivisch von unten; und
Fig. 4
eine Teilansicht entsprechend der Fig. 1 mit am unteren oder inneren Felgenhorn angreifender Profilstreckwalze.
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:
Fig. 1
a side view of essential parts of an apparatus according to the invention for producing a light metal wheel - without profile stretching roller;
Fig. 2
a perspective view obliquely from above on a wheel and essential parts of the device according to the invention (profile stretching rollers not visible);
Fig. 3
a view of the essential features of the device according to the invention in perspective from below; and
Fig. 4
a partial view according to the Fig. 1 with profile stretching roller acting on the lower or inner rim flange.

Die Fig. 1 und 4 zeigen ein Kraftfahrzeug-Metallrad 1 gestrichelt 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 1a eine Radscheibe oder einen Speichenbereich 1.3 mit einer Nabe 1.4 auf. Im inneren Bereich 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 1b - auf.The Fig. 1 and 4 show a motor vehicle metal wheel 1 dashed as a preform and traced with its final contour in section ( Fig. 4 only in partial representation). The wheel 1 has a rim 1.1 and on its outside 1a a wheel disc or a spoke area 1.3 with a hub 1.4. In the inner region of the wheel disc 1.3 outside the hub 1.4 breakthroughs 1.5 are provided for attachment of 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 inside 1b.

Während der äußere Bereich der Vorform 1.8, insbesondere Radscheibe oder Speichenbereich 1.3 der Endform sehr angenähert sind, erstreckt sich der Mantel der Vorform der erfindungsgemäßen Kombination, insbesondere in seinem inneren Bereich radial deutlich über die Endkontur des Rades hinaus. Darüber hinaus erstreckt sich der Mantel bei der Vorform der erfindungsgemäßen Kombination 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 wheel disc or spoke region 1.3, is very close to the final shape, the jacket of the preform of the combination according to the invention extends radially, in particular in its inner region, clearly beyond the final contour of the wheel. In addition, in the case of the preform of the combination according to the invention, 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. des 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 the Fig. 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, a plurality acting on the peripheral wall of the preform or the wheel different trained drafting rollers 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. 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 1a des Rades 1 zu seiner Innenseite 1b 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 radialen 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 Vorform des Rades nach unten strecken und gleichzeitig verdichten.On the outer circumference of the wheel 1 engage, in particular evenly distributed over the circumference, stretching rollers 3, which, as in the left-side overlay representation of Fig. 1 represented, may be formed differently. They first attack in the upper part of the preform of the wheel 1, while exerting a radial pressure and at the same time travel along the preform of the wheel down, where they are the later Radmantel or the actual by the pressure exerted Rim 1.1 of the wheel 1 forming part 1.8 stretch the preform of the wheel down and compact at the same time.

Die Vorform des Rades 1 bzw. das Rad 1 wird 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 or the wheel 1 is 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 is rather underrun by additional free-running roles 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 vorgesehenen Profilnut 5.1 das Profil des inneren Felgenhorns 1.7 endformt. Die drei 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 kegelstumpfförmig 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 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, like that Fig. 3 and in particular the Fig. 4 can be seen, laterally provided in the region of the inner rim flange 1.7 to be formed circumferentially between two free-running rollers 4 at least one profile stretching roller 5, the profile of the inner rim flange 1.7 by radial pressure exerted in its circumferential groove provided on the profile 5.1. The three rotating rollers 4 are, as from the Fig. 1 it can be seen with its axis of rotation 4.1 to the axis of rotation 2.1 of the mandrel 2 and thus the rotationally fixed seated wheel 1 at an angle α of about 60 ° aligned. The freely rotating rollers 4 are formed frusto-conical and taper from its bottom to the top, wherein the jacket wall 4.2 forms an angle of 20 ° to 30 ° to the axis of rotation 4.1. The freely rotating rollers 4 engage with their jacket wall on the inside underside of the wheel 1 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 degree, for example, between 50 ° and 70 ° relative to the axis of rotation of the 2.1 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 attack of the axis of rotation 4.1.

Der Herstellungsverlauf ist im Wesentlichen der folgende:

  • 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°. 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.
The manufacturing process is essentially the following:
  • 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 over 350 °. 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 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.

Claims (11)

  1. Combination of a device for producing a lightweight metal wheel (1) from a preform and a preform of the lightweight metal wheel (1) to be produced, wherein the preform has a jacket which in the axial direction only extends over part of the height of the finished wheel (1) and has a rotationally symmetrical jacket formation, wherein the jacket extends in its inner region, facing away from the outer region of the wheel (1), radially beyond the end contour of the wheel (1), with stretching rolls (3), which engage on the rim region of the preform, exert radial pressure on the circumferential wall and are movable along this wall in the axial direction, wherein a rim (1.1) of the wheel (1) can be brought into its final form by means of the stretching rolls (3), by stretching material of the jacket of the wheel (1), wherein freely rotatable rollers (4) are arranged underneath the stretching rolls (3) with the same circumferential angles as the stretching rolls, to form an inner rim flange (1.7), the freely rotatable rollers (4) engage with their jacket wall (4.2) under the preform in the region of the rim flange (1.7) to be formed, and the stretching rolls interact with the freely rotatable rollers (4), while stretching preform material against said rollers, to form an inner rim flange (1.7) of the wheel (1).
  2. Device according to Claim 1, characterized in that the freely rotating rollers (4) have an axis of rotation (4.1) that is inclined in relation to an axis of rotation (2.1) of the preform with an angle of inclination (α) of 50° to 70°.
  3. Device according to Claim 2, characterized in that the angle of inclination (α) of the axes of rotation (4.1) of the freely rotating rollers in relation to the axis of rotation (2.1) of the preform is adjustable.
  4. Device according to one of the preceding claims, characterized in that the freely rotating rollers (4) engage with their jacket wall (4.2) under the rim flange (1.7) to be formed.
  5. Device according to one of the preceding claims, characterized in that the freely rotating rollers (4) are formed as frustoconical.
  6. Device according to Claim 5, characterized in that the jacket wall (4.2) of the freely rotating rollers (4) forms an angle with the axis of rotation (4.1) of the freely rotating rollers (4) of between 20° and 40°.
  7. Device according to one of the preceding claims, characterized by at least one profiled stretching roll (5) that brings a rim flange (1.7) into its final form.
  8. Method for producing a metal wheel by means of stretch rolling from a preform, wherein the preform has a jacket which in the axial direction only extends over part of the height of the finished wheel and extends in its inner region, facing away from the outer region of the wheel, radially beyond the end contour of the wheel, wherein the preform of the metal wheel (1) to be produced is placed onto a clamping mandrel (2), wherein stretching rolls (3) act in the upper region of the rotationally symmetrical jacket of the preform while exerting radial pressure, wherein the stretching rolls move along the jacket wall of the preform with a main component of movement parallel to the axis of rotation and thereby stretch the jacket wall of the preform while compressing the jacket of the wheel in the axial direction to form a rim, wherein the preform is engaged under by jacket walls (4.2) of freely rotating rollers (4), which are arranged around the circumference of the preform at the same circumferential angles as the stretching rolls (3), and wherein the stretching rolls (3) together with the freely rotating rollers (4) form an inner rim flange (1.7) by stretching preform material against the under-engaging freely rotating rollers (4).
  9. Method according to Claim 8, characterized in that the freely rotating rollers (4) rotate about axes which form angles of inclination in relation to the axis of rotation (2.1) of the preform of 50° to 70°.
  10. Method according to Claim 8 or 9, characterized in that the freely rotating rollers (4) engage under the lower edge of the preform with their jacket (4.2), which forms an angle with the axis of rotation (4.1) of the freely rotating rollers (4) of 20° to 40°.
  11. Method according to one of Claims 8 to 10, characterized in that at least one profiled stretching roll (5) acts on the rim flange (1.7) formed between the stretching rolls (3) and the freely rotating rollers (4) while exerting radial pressure to bring about the final form of the rim flange (1.7).
EP12818482.7A 2011-10-27 2012-10-24 Combination of a preform and device and method for producing a lightweight metal wheel Active EP2771137B1 (en)

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HUE032294T2 (en) 2017-09-28
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US20140283572A1 (en) 2014-09-25
HUE053016T2 (en) 2021-06-28
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EP3189909A1 (en) 2017-07-12

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