EP1335805B1 - Method for making a vehicle wheel rim - Google Patents

Method for making a vehicle wheel rim Download PDF

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Publication number
EP1335805B1
EP1335805B1 EP01980534A EP01980534A EP1335805B1 EP 1335805 B1 EP1335805 B1 EP 1335805B1 EP 01980534 A EP01980534 A EP 01980534A EP 01980534 A EP01980534 A EP 01980534A EP 1335805 B1 EP1335805 B1 EP 1335805B1
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EP
European Patent Office
Prior art keywords
hoop
rim
thickness
ferrule
zone
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.)
Expired - Lifetime
Application number
EP01980534A
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German (de)
French (fr)
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EP1335805A1 (en
Inventor
Bruno Guimard
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.)
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
Original Assignee
Michelin Recherche et Technique SA Switzerland
Michelin Recherche et Technique SA France
Societe de Technologie Michelin SAS
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Application filed by Michelin Recherche et Technique SA Switzerland, Michelin Recherche et Technique SA France, Societe de Technologie Michelin SAS filed Critical Michelin Recherche et Technique SA Switzerland
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    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49481—Wheel making
    • Y10T29/49492—Land wheel
    • Y10T29/49524—Rim making
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49481—Wheel making
    • Y10T29/49492—Land wheel
    • Y10T29/49524—Rim making
    • Y10T29/49531—Roller forming

Definitions

  • the invention relates to a method for produce a wheel rim according to the preamble of claim 1.
  • US Patent 5,579,578 discloses a method of producing a wheel rim for vehicle with the steps of the preamble of claim 1.
  • the flow turning operations of the ferrule of a wheel rim are however likely to produce ferrules whose axial width may vary over their circumference.
  • the subject of the invention is an improved method of manufacturing a wheel rim which Significantly reduces the manufacturing dispersion of wheel rims. This process allows also to get reduced weight wheels.
  • the normal cutting operation at the axis of the shell of at least one lateral edge of the ferrule after the cylindrical fluotoumage operation has the advantage of eliminating all or part the extra thickness of the two ends of the rim finished, this reduces the final weight of the rim. It should be noted that the reduction in thickness during a flow forming operation cannot be applied to the two lateral edges of the ferrule. This thickness is therefore necessarily identical to the thickness of the starting metal blank. This operation also ensures that the edge of the ferrule is flat and that this plane is orthogonal to the axis of this same shell.
  • the cutting operation can be carried out on the inner side of the rim (i.e. side intended to be placed towards the interior of the vehicle). This has the advantage of reducing the thickness of the inner hook of the rim, which is less exposed than the hook outside to shocks.
  • the cutting operation can also relate to the two lateral edges of the shell.
  • the advantage is then to maximize the reduction in weight of the rim and obtain a excellent flatness of the lateral edges of the shell as well as a remarkable regularity of the axial width of the ferrule.
  • Figure 1 a partial section of a conventional steel sheet wheel.
  • This wheel 1 includes a rim 2 and a disc 3.
  • This figure illustrates the median plane of the wheel or plane P. This plane is placed at equal distance from the two hooks of the rim. The axially inner and outer positions are defined taking as reference the median plane P.
  • the rim has an outer hook 4, an outer seat 5, a safety boss or “hump” 6, a mounting groove 7, an interior seat 9 and an interior hook 10.
  • the disc 3 includes a hub seat 11, a transition zone 12 and an edge 13. The assembly is carried out by fitting under the mounting groove 7.
  • This figure also shows the axis of rotation A of the wheel.
  • FIG. 2 A method for producing the rims of the wheels according to the invention is illustrated in FIG. 2.
  • a sheet of metal sheet (not shown) of steel, aluminum or of alloys, is bent to give it a generally cylindrical shape of a ferrule 14 with two free edges.
  • the shell 14 is welded by a welding process by sparking, by resistance or other.
  • This ferrule 14 has a constant thickness ( Figure 3).
  • the ferrule 14 is then preferably calibrated in extension using a calibration tool shown schematically in Figure 4.
  • the expansion is obtained by moving a cam 15 which aside from the sectors 16 around which the ferrule 14 is installed.
  • FIG. 5 illustrates the step next which consists in obtaining by cylindrical flow turning the desired flat profile for the rims according to the invention.
  • the flow-forming process used is reverse flow-turning.
  • the ferrule 14 is mounted on a mandrel 17 and bears against a wall of the system 18 for locking the ferrule 14.
  • the mandrel 17 is then rotated and at least two knurls 19 roll on the radially outer surface of the ferrule 14 in the zones whose thickness must be reduced.
  • the rollers 19 are moved axially in the direction of the X axis by applying a radial force and tangential so that the material flow flows in the direction of Y. This creep of material is carried out in the opposite direction to the movement of the rollers 19.
  • FIG. 5 illustrates schematically the ferrule 20 of variable profile obtained.
  • FIG. 6 illustrates a first defect likely to be presented by the shell 20 after the flow-turning operations.
  • This defect corresponds to local variations in width axial of the ferrule 20. These variations are particularly observed on the attack side wheels.
  • the edge 24 is not perfectly cylindrical but has variations axial position. These variations are automatically reflected in the profile of the rim. It is thus possible to have variations in the profile of the edge of the hooks which can locally make it difficult to install or fix the balancing weights.
  • Figure 7 illustrates a second defect that can be observed: a defect in perpendicularity between the plane defined by the edge 24 of the ferrule 20 and that defined by the axis of the ferrule 20.
  • the angle ⁇ between these two planes can reach 1 to 2 degrees.
  • Figure 8 illustrates a third fault.
  • a partial profile of two ferrules 25 and 26 are substantially identical except for the length of the non-spinning areas on the side abutting the mandrel (on the left side of the figure).
  • These zones 27 for the shell 25 and 28 for the shell 26 differ from one length d. This difference is due to a variation in thickness of the starting blank between the two ferrules.
  • the ferrule 26 has a starting blank whose thickness is greater than that of the ferrule 25.
  • the profile of the two ferrules after flow turning is substantially identical because the relative displacement of the rollers is linked to the axial increase of the fluotoumées zones.
  • the effectively flow-turned area is axially smaller for a ferrule thicker.
  • a variation of thickness of 0.05 mm can cause a variation in axial width of the non-flow-turned area on the 5 mm stop side.
  • This problem is resolved by taking as a reference a characteristic point R of the profile of the shell after the flow-turning operations to define the position of the planes D 1 and D 2 for cutting the edges of the shell.
  • This point R is advantageously taken adjacent to an area of variable thickness and an area of fixed thickness as illustrated in FIG. 8.
  • a profile control system is used to determine the position of the cutting plane or of the two planes cutting as appropriate. It should be noted that it is not possible to take as a reference the edge of the ferrule on the attack side of the rollers because it is this edge which is the most sensitive to variations and undulations as has already been indicated.
  • Figure 9 (a) schematically illustrates the profile of one end of the shell 20 after the flow spinning operation.
  • This profile comprises a non-flow-formed outer zone 21 of axial width L minimum and of thickness e corresponding to the thickness of the starting blank, a transition zone 22 in which the thickness gradually decreases and a zone 23 of thickness e 1 scaled down.
  • Figure 9 (b) shows the profile of the outer edge of the resulting rim after rolling profiling operations.
  • the first zone 21 corresponds to the rim 31 of the rim hook 4, the zone of reduced thickness 23 at the seat 5 of the rim and at the start 29 of the hook and the transition zone 22 to the intermediate zone 30.
  • the hook 4 of the rim thus has three adjacent zones: the zone 29 of reduced thickness identical to that of the seat 5, the transition zone 30 whose thickness gradually increases and the zone 31 of thickness e identical to that of the blank of departure.
  • the hook 4 of FIG. 9 (b) thus has an excess thickness which may be necessary or not depending on the type of wheel concerned.
  • Figures 10 and 11 show two forms of hooks resulting from two different cutting operations.
  • the cutting plane D is located axially at a distance L from the junction point between the non-flow-turned zone 21 of thickness e and the transition zone 22 of variable thickness between e and e 1 .
  • the hook 4 has, after the cutting operation, a reduced area 32 of thickness e.
  • the rim thus has a reduced weight.
  • the cutting plane is located in zone 23, which has undergone a flow spinning to reduce its thickness from e to e 1 .
  • the hook resulting from the profiling operations therefore has an identical thickness over its entire length. The weight reduction is then maximum.
  • the edge of the shell can be cut by any suitable process, in particular turning or cutting with a wheel.
  • the rims are calibrated as follows obtained then we carry out the fitting with appropriate discs.
  • Figure 2 includes a step of machining the fitting area of the rim. This step is optional. The purpose of this step is to perfect the cylindrical geometry of the area fitting in the case of a sensitive assembly.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Testing Of Balance (AREA)
  • Forging (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Heat Treatment Of Articles (AREA)
  • Tyre Moulding (AREA)

Abstract

A method of making a rim of sheet metal for a vehicle wheel, in which: a rectangular geometric shape is cut out of a blank of sheet metal; the blank is bent to obtain a cylindrical hoop; the two free edges of the hoop are welded together; at least one cylindrical flow spinning operation is performed to obtain a profile of given thickness of the hoop, zones of constant thickness being adjacent to zones of variable thickness; a cut is made perpendicular to the axis of the hoop out of at least one lateral edge of the hoop; the hoop is profiled to obtain the rim; and the size of the said rim is set.

Description

L'invention concerne un procédé pour réaliser une jante de roue, selon le préambule de la revendication 1.The invention relates to a method for produce a wheel rim according to the preamble of claim 1.

Le brevet US 5 579 578 divulgue un procédé de réalisation d'une jante de roue pour véhicule avec les étapes du préambule de la revendication 1.US Patent 5,579,578 discloses a method of producing a wheel rim for vehicle with the steps of the preamble of claim 1.

Ce brevet indique que réaliser les opérations de fluotournage avant celles de profilage par roulage permet d'obtenir une jante de roue avec de bonnes tolérances de fabrication.This patent indicates that carrying out the flow spinning operations before those of profiling by rolling makes it possible to obtain a wheel rim with good manufacturing tolerances.

Les opérations de fluotournage de la virole d'une jante de roue sont cependant susceptibles de produire des viroles dont la largeur axiale peut varier sur leur circonférence. On peut aussi observer des défauts de perpendicularité entre le plan défini par le bord de la virole et celui défini par l'axe de la virole. Ces variations et défauts peuvent provoquer des instabilités lors des opérations suivantes de roulage de la virole, elles peuvent aussi rendre plus difficile, localement, l'accrochage des masses d'équilibrage des roues. The flow turning operations of the ferrule of a wheel rim are however likely to produce ferrules whose axial width may vary over their circumference. One can also observe defects of perpendicularity between the defined plane by the edge of the ferrule and that defined by the axis of the ferrule. These variations and faults may cause instability during the following operations of rolling the shell, they can also make it more difficult, locally, to hook the masses wheel balancing.

L'invention a pour objet un procédé perfectionné de fabrication d'une jante de roue qui diminue sensiblement la dispersion de fabrication des jantes de roues. Ce procédé permet aussi d'obtenir des roues de poids réduit.The subject of the invention is an improved method of manufacturing a wheel rim which Significantly reduces the manufacturing dispersion of wheel rims. This process allows also to get reduced weight wheels.

Le procédé de fabrication d'une jante en tôle métallique d'une roue pour véhicule selon l'invention est défini dans la revendication 1.The method of manufacturing a sheet metal rim of a wheel for a vehicle according to the invention is defined in claim 1.

L'opération de découpe normale à l'axe de la virole d'au moins un bord latéral de la virole après l'opération de fluotoumage cylindrique a l'avantage de supprimer en tout ou partie la surépaisseur des deux extrémités de la jante terminée, cela réduit le poids final de la jante. Il est à noter que la réduction d'épaisseur lors d'une opération de fluotournage ne peut pas s'appliquer aux deux bords latéraux de la virole. Cette épaisseur est donc nécessairement identique à l'épaisseur du flan métallique de départ. Cette opération permet aussi de garantir que le bord de la virole est bien plan et que ce plan est orthogonal à l'axe de cette même virole.The normal cutting operation at the axis of the shell of at least one lateral edge of the ferrule after the cylindrical fluotoumage operation has the advantage of eliminating all or part the extra thickness of the two ends of the rim finished, this reduces the final weight of the rim. It should be noted that the reduction in thickness during a flow forming operation cannot be applied to the two lateral edges of the ferrule. This thickness is therefore necessarily identical to the thickness of the starting metal blank. This operation also ensures that the edge of the ferrule is flat and that this plane is orthogonal to the axis of this same shell.

L'opération de découpe peut être effectuée du côté intérieur de la jante (c'est-à-dire du côté destiné à être disposé vers l'intérieur du véhicule). Cela a l'avantage de réduire l'épaisseur du crochet intérieur de la jante, crochet qui est moins exposé que le crochet extérieur à des chocs. The cutting operation can be carried out on the inner side of the rim (i.e. side intended to be placed towards the interior of the vehicle). This has the advantage of reducing the thickness of the inner hook of the rim, which is less exposed than the hook outside to shocks.

L'opération de découpe peut aussi concerner les deux bords latéraux de la virole. L'avantage est alors de maximiser la réduction de poids de la jante et d'obtenir une excellente planéité des bords latéraux de la virole ainsi qu'une remarquable régularité de la largeur axiale de la virole.The cutting operation can also relate to the two lateral edges of the shell. The advantage is then to maximize the reduction in weight of the rim and obtain a excellent flatness of the lateral edges of the shell as well as a remarkable regularity of the axial width of the ferrule.

On peut découper seulement une partie de la zone non fluotournée en bord de virole, dans ce cas on obtient tous les avantages liés à la qualité géométrique de la virole obtenue mais la réduction de poids est limitée.We can cut out only part of the non-flow-turned area at the edge of the shell, in this case we obtain all the advantages linked to the geometric quality of the shell obtained but weight reduction is limited.

On peut aussi découper au moins une partie de la zone fluotoumée en bord de virole. La jante finale va alors avoir un gain de poids particulièrement sensible.It is also possible to cut out at least part of the fluotoumée zone at the edge of the shell. The final rim will then have a particularly noticeable weight gain.

Grâce au procédé de l'invention on peut ainsi ajuster la position des zones de transition entre zones fluotournées et le bord de la virole. Cela améliore le respect des tolérances des cotes de la jante finale.Thanks to the process of the invention, it is thus possible to adjust the position of the transition zones between flow-turned zones and the edge of the ferrule. This improves compliance with the tolerances of the dimensions of the final rim.

Plusieurs modes de réalisation de l'invention sont maintenant décrits à l'aide du dessin annexé dans lequel :

  • la figure 1 est une coupe d'une roue usuelle avec assemblage sous la gorge de montage ;
  • la figure 2 présente les différentes étapes d'un procédé de réalisation d'une roue selon l'invention ;
  • les figures 3, 4 et 5 illustrent schématiquement différentes étapes du procédé de réalisation d'une jante selon l'invention ;
  • la figure 6 présente schématiquement un premier type de défaut rencontré après les opérations de fluotournage ;
  • la figure 7 présente schématiquement un second type de défaut rencontré après les opérations de fluotournage ;
  • la figure 8 présente schématiquement un troisième type de défaut rencontré après les opérations de fluotournage ;
  • la figure 9 présente schématiquement un détail d'une première virole correspondant au crochet de jante après les opérations de fluotournage ainsi que la partie de jante en résultant après profilage ;
  • la figure 10 illustre schématiquement un détail d'une seconde virole correspondant au crochet de jante après les opérations de fluotournage ainsi que la partie de jante en résultant après profilage ;
  • la figure 11 illustre schématiquement un détail d'une troisième virole correspondant au crochet de jante après les opérations de fluotoumage ainsi que la partie de jante en résultant après profilage.
Several embodiments of the invention are now described with the aid of the appended drawing in which:
  • Figure 1 is a section of a conventional wheel with assembly under the mounting groove;
  • FIG. 2 shows the different stages of a method for producing a wheel according to the invention;
  • Figures 3, 4 and 5 schematically illustrate different steps of the method of producing a rim according to the invention;
  • FIG. 6 schematically presents a first type of defect encountered after the flow spinning operations;
  • FIG. 7 schematically shows a second type of fault encountered after the flow spinning operations;
  • FIG. 8 schematically shows a third type of fault encountered after the flow spinning operations;
  • FIG. 9 schematically shows a detail of a first ferrule corresponding to the rim hook after the flow spinning operations as well as the resulting rim part after profiling;
  • FIG. 10 schematically illustrates a detail of a second ferrule corresponding to the rim hook after the flow spinning operations as well as the resulting rim part after profiling;
  • FIG. 11 schematically illustrates a detail of a third ferrule corresponding to the rim hook after the fluotoumage operations as well as the resulting rim part after profiling.

A la figure 1 est présentée une coupe partielle d'une roue usuelle en tôle d'acier. Cette roue 1 comprend une jante 2 et un disque 3. Cette figure illustre le plan médian de la roue ou plan P. Ce plan est disposé à égale distance des deux crochets de la jante. Les positions axialement intérieures et extérieures sont définies en prenant comme référence le plan médian P.In Figure 1 is shown a partial section of a conventional steel sheet wheel. This wheel 1 includes a rim 2 and a disc 3. This figure illustrates the median plane of the wheel or plane P. This plane is placed at equal distance from the two hooks of the rim. The axially inner and outer positions are defined taking as reference the median plane P.

La jante présente un crochet extérieur 4, un siège extérieur 5, un bossage de sécurité ou " hump " 6, une gorge de montage 7, un siège intérieur 9 et un crochet intérieur 10. Le disque 3 comprend une portée moyeu 11, une zone de transition 12 et un bord d'assemblage 13. L'assemblage est réalisé par emboítage sous la gorge de montage 7.The rim has an outer hook 4, an outer seat 5, a safety boss or "hump" 6, a mounting groove 7, an interior seat 9 and an interior hook 10. The disc 3 includes a hub seat 11, a transition zone 12 and an edge 13. The assembly is carried out by fitting under the mounting groove 7.

On voit aussi sur cette figure l'axe de rotation A de la roue.This figure also shows the axis of rotation A of the wheel.

Dans ce qui suit, on utilisera les mêmes références pour les parties similaires des roues selon l'invention.In what follows, the same references will be used for the similar parts of the wheels. according to the invention.

Un procédé de réalisation des jantes des roues selon l'invention est illustré à la figure 2. Initialement, un flan de tôle métallique (non représenté) d'acier, d'aluminium ou d'alliages, est cintré pour lui donner une forme généralement cylindrique de virole 14 avec deux bords libres. Ensuite, la virole 14 est soudée par un procédé de soudure par étincelage, par résistance ou autre. Cette virole 14 a une épaisseur constante (figure 3). La virole 14 est ensuite, de préférence, calibrée en extension à l'aide d'un outil de calibrage schématisé à la figure 4. L'expansion est obtenue par le déplacement d'une came 15 qui écarte des secteurs 16 autour desquels est installée la virole 14. La figure 5 illustre l'étape suivante qui consiste à obtenir par fluotournage cylindrique le profil à plat recherché pour les jantes selon l'invention. Le procédé de fluotournage utilisé est le fluotournage inverse. La virole 14 est montée sur un mandrin 17 et vient en appui contre une paroi du système 18 de blocage de la virole 14. Le mandrin 17 est alors mis en rotation et au moins deux molettes 19 viennent rouler sur la surface radialement extérieure de la virole 14 dans les zones dont l'épaisseur doit être diminuée. Relativement au mandrin 17, les molettes 19 sont déplacées axialement dans la direction de l'axe X en appliquant un effort radial et tangentiel de telle sorte que le flux de matière flue en direction de Y. Ce fluage de matière s'effectue en sens inverse du déplacement des molettes 19. La figure 5 illustre schématiquement la virole 20 de profil variable obtenue.A method for producing the rims of the wheels according to the invention is illustrated in FIG. 2. Initially, a sheet of metal sheet (not shown) of steel, aluminum or of alloys, is bent to give it a generally cylindrical shape of a ferrule 14 with two free edges. Then, the shell 14 is welded by a welding process by sparking, by resistance or other. This ferrule 14 has a constant thickness (Figure 3). The ferrule 14 is then preferably calibrated in extension using a calibration tool shown schematically in Figure 4. The expansion is obtained by moving a cam 15 which aside from the sectors 16 around which the ferrule 14 is installed. FIG. 5 illustrates the step next which consists in obtaining by cylindrical flow turning the desired flat profile for the rims according to the invention. The flow-forming process used is reverse flow-turning. The ferrule 14 is mounted on a mandrel 17 and bears against a wall of the system 18 for locking the ferrule 14. The mandrel 17 is then rotated and at least two knurls 19 roll on the radially outer surface of the ferrule 14 in the zones whose thickness must be reduced. Relative to the mandrel 17, the rollers 19 are moved axially in the direction of the X axis by applying a radial force and tangential so that the material flow flows in the direction of Y. This creep of material is carried out in the opposite direction to the movement of the rollers 19. FIG. 5 illustrates schematically the ferrule 20 of variable profile obtained.

Ce procédé de fluotournage inverse ne permet pas de réduire l'épaisseur de l'intégralité de la virole. En effet, on est contraint de laisser de chaque côté de la virole une zone non fluotoumée : du côté d'attaque des molettes, cela risquerait de déstabiliser la virole et d'endommager les molettes ; du côté du dispositif de fixation de la virole faisant butée, il faut laisser une zone de largeur axiale Lmini pour que ce dispositif puisse pincer le bord de la virole et l'entraíner en rotation lors de l'opération de fluotournage.This reverse flow spinning process does not reduce the thickness of the entire ferrule. Indeed, we are forced to leave on each side of the shell a non-fluotoumée area: on the attack side of the rollers, this would risk destabilizing the shell and damaging the rollers; on the side of the ferrule fixing device making a stop, it is necessary to leave an area of axial width L mini so that this device can pinch the edge of the ferrule and cause it to rotate during the flow spinning operation.

La figure 6 illustre un premier défaut susceptible d'être présenté par la virole 20 après les opérations de fluotournage. Ce défaut correspond à des variations locales de largeur axiale de la virole 20. Ces variations sont particulièrement observées du côté d'attaque des molettes. Le bord 24 n'est pas parfaitement cylindrique mais présente des variations locales de position axiale. Ces variations se répercutent automatiquement sur le profil de la jante. On peut ainsi avoir des variations du profil du rebord des crochets qui peuvent rendre difficile localement la mise en place ou la fixation des masses d'équilibrage. FIG. 6 illustrates a first defect likely to be presented by the shell 20 after the flow-turning operations. This defect corresponds to local variations in width axial of the ferrule 20. These variations are particularly observed on the attack side wheels. The edge 24 is not perfectly cylindrical but has variations axial position. These variations are automatically reflected in the profile of the rim. It is thus possible to have variations in the profile of the edge of the hooks which can locally make it difficult to install or fix the balancing weights.

La réalisation d'une opération de découpe des deux bords de la virole après les opérations de fluotournage permet de garantir une largeur constante de la virole en tout point de celle-ci.Carrying out an operation of cutting the two edges of the shell after the operations flow turning guarantees a constant width of the shell at any point it.

La figure 7 illustre un second défaut qui peut être observé : un défaut de perpendicularité entre le plan défini par le bord 24 de la virole 20 et celui défini par l'axe de la virole 20. L'angle α entre ces deux plans peut atteindre 1 à 2 degrés.Figure 7 illustrates a second defect that can be observed: a defect in perpendicularity between the plane defined by the edge 24 of the ferrule 20 and that defined by the axis of the ferrule 20. The angle α between these two planes can reach 1 to 2 degrees.

La réalisation d'une opération de découpe d'un bord de la virole après les opérations de fluotournage permet de garantir l'orthogonalité du plan défini par ce bord de la virole et l'axe de cette virole.Carrying out an operation of cutting an edge of the shell after the operations of flow turning guarantees the orthogonality of the plane defined by this edge of the shell and the axis of this ferrule.

La figure 8 illustre un troisième défaut. Sur cette figure, on voit un profil partiel de deux viroles 25 et 26. Ces deux profils sont sensiblement identiques à l'exception de la longueur des zones non fluotournées du côté en butée contre le mandrin (du côté gauche de la figure). Ces zones 27 pour la virole 25 et 28 pour la virole 26 diffèrent d'une longueur d. Cet écart est dû à une variation d'épaisseur du flan de départ entre les deux viroles. La virole 26 a un flan de départ dont l'épaisseur est supérieure à celle de la virole 25. En dépit de cette variation d'épaisseur initiale, le profil des deux viroles après fluotournage est sensiblement identique car le déplacement relatif des molettes est lié à l'accroissement axial des zones fluotoumées. En revanche, pour une même largeur axiale de virole, la zone effectivement fluotournée est axialement plus petite pour une virole d'épaisseur supérieure. Pour une jante de roue tourisme de diamètre 15 pouces (381 mm), une variation d'épaisseur de 0,05 mm peut entraíner une variation de largeur axiale de la zone non fluotournée du côté en butée de 5 mm.Figure 8 illustrates a third fault. In this figure, we see a partial profile of two ferrules 25 and 26. These two profiles are substantially identical except for the length of the non-spinning areas on the side abutting the mandrel (on the left side of the figure). These zones 27 for the shell 25 and 28 for the shell 26 differ from one length d. This difference is due to a variation in thickness of the starting blank between the two ferrules. The ferrule 26 has a starting blank whose thickness is greater than that of the ferrule 25. Despite this variation in initial thickness, the profile of the two ferrules after flow turning is substantially identical because the relative displacement of the rollers is linked to the axial increase of the fluotoumées zones. However, for the same axial width of the ferrule, the effectively flow-turned area is axially smaller for a ferrule thicker. For a 15-inch (381 mm) diameter touring wheel rim, a variation of thickness of 0.05 mm can cause a variation in axial width of the non-flow-turned area on the 5 mm stop side.

Ce problème est réglé en prenant comme référence un point caractéristique R du profil de la virole après les opérations de fluotournage pour définir la position des plans D1 et D2 de découpe des bords de la virole. Ce point R est avantageusement pris adjacent à une zone d'épaisseur variable et une zone d'épaisseur fixe comme illustré sur la figure 8. Concrètement, on utilise un système de contrôle du profil pour déterminer la position du plan de découpe ou des deux plans de découpe selon le cas. Il est à noter qu'il n'est pas possible de prendre comme référence le bord de la virole du côté d'attaque des molettes car c'est ce bord qui est le plus sensible aux variations et ondulations comme il a déjà été indiqué.This problem is resolved by taking as a reference a characteristic point R of the profile of the shell after the flow-turning operations to define the position of the planes D 1 and D 2 for cutting the edges of the shell. This point R is advantageously taken adjacent to an area of variable thickness and an area of fixed thickness as illustrated in FIG. 8. Concretely, a profile control system is used to determine the position of the cutting plane or of the two planes cutting as appropriate. It should be noted that it is not possible to take as a reference the edge of the ferrule on the attack side of the rollers because it is this edge which is the most sensitive to variations and undulations as has already been indicated.

La figure 9(a) illustre schématiquement le profil de l'une des extrémités de la virole 20 après l'opération de fluotournage. Ce profil comprend une zone extérieure 21 non fluotournée de largeur axiale Lmini et d'épaisseur e correspondant à l'épaisseur du flan de départ, une zone de transition 22 dans laquelle l'épaisseur diminue progressivement et une zone 23 d'épaisseur e1 réduite. La figure 9(b) présente le profil du bord extérieur de la jante résultante après les opérations de profilage par roulage. La première zone 21 correspond au rebord 31 du crochet de jante 4, la zone d'épaisseur réduite 23 au siège 5 de la jante et au début 29 du crochet et la zone de transition 22 à la zone 30 intermédiaire. Le crochet 4 de la jante a ainsi trois zones adjacentes : la zone 29 d'épaisseur réduite identique à celle du siège 5, la zone de transition 30 dont l'épaisseur augmente progressivement et la zone 31 d'épaisseur e identique à celle du flan de départ.Figure 9 (a) schematically illustrates the profile of one end of the shell 20 after the flow spinning operation. This profile comprises a non-flow-formed outer zone 21 of axial width L minimum and of thickness e corresponding to the thickness of the starting blank, a transition zone 22 in which the thickness gradually decreases and a zone 23 of thickness e 1 scaled down. Figure 9 (b) shows the profile of the outer edge of the resulting rim after rolling profiling operations. The first zone 21 corresponds to the rim 31 of the rim hook 4, the zone of reduced thickness 23 at the seat 5 of the rim and at the start 29 of the hook and the transition zone 22 to the intermediate zone 30. The hook 4 of the rim thus has three adjacent zones: the zone 29 of reduced thickness identical to that of the seat 5, the transition zone 30 whose thickness gradually increases and the zone 31 of thickness e identical to that of the blank of departure.

Le crochet 4 de la figure 9(b) présente ainsi une surépaisseur qui peut être nécessaire ou non selon le type de roue concernée.The hook 4 of FIG. 9 (b) thus has an excess thickness which may be necessary or not depending on the type of wheel concerned.

Les figures 10 et 11 présentent deux formes de crochets résultant de deux opérations de découpe différentes. Dans le cas de la figure 10, le plan de découpe D est situé axialement à une distance L du point de jonction entre la zone 21 non fluotournée d'épaisseur e et la zone de transition 22 d'épaisseur variable entre e et e1. Il en résulte que le crochet 4 présente, après l'opération de découpe, une zone réduite 32 d'épaisseur e. La jante a ainsi un poids réduit.Figures 10 and 11 show two forms of hooks resulting from two different cutting operations. In the case of FIG. 10, the cutting plane D is located axially at a distance L from the junction point between the non-flow-turned zone 21 of thickness e and the transition zone 22 of variable thickness between e and e 1 . As a result, the hook 4 has, after the cutting operation, a reduced area 32 of thickness e. The rim thus has a reduced weight.

A la figure 11, le plan de découpe se situe dans la zone 23, qui a subi un fluotournage pour réduire son épaisseur de e à e1. Le crochet résultant après les opérations de profilage a donc une épaisseur identique sur toute sa longueur. La réduction de poids est alors maximale. In FIG. 11, the cutting plane is located in zone 23, which has undergone a flow spinning to reduce its thickness from e to e 1 . The hook resulting from the profiling operations therefore has an identical thickness over its entire length. The weight reduction is then maximum.

Il est à noter que pour améliorer la clarté des figures 9 à 11, leur échelle dans une direction perpendiculaire à l'axe de la virole est cinq fois plus grande que l'échelle dans la direction de l'axe de la virole.It should be noted that to improve the clarity of Figures 9 to 11, their scale in a direction perpendicular to the axis of the ferrule is five times larger than the scale in the direction of the axis of the ferrule.

La découpe du bord de la virole peut s'effectuer par tout procédé approprié, notamment tournage ou découpe à la molette.The edge of the shell can be cut by any suitable process, in particular turning or cutting with a wheel.

Après les opérations de profilage par roulage de la virole, on calibre les jantes ainsi obtenues puis on réalise l'emboítage avec des disques appropriés.After the profiling operations by rolling the ferrule, the rims are calibrated as follows obtained then we carry out the fitting with appropriate discs.

La figure 2 comporte une étape d'usinage de la zone d'emboítage de la jante. Cette étape est optionnelle. Cette étape a pour but de parfaire la géométrie cylindrique de la zone d'emboítage dans le cas d'un assemblage sensible.Figure 2 includes a step of machining the fitting area of the rim. This step is optional. The purpose of this step is to perfect the cylindrical geometry of the area fitting in the case of a sensitive assembly.

Claims (7)

  1. A method of making a rim (2) of sheet metal for a vehicle wheel, which has the following steps:
    a rectangular geometric shape is cut out of a blank of sheet metal;
    the blank is bent to obtain a cylindrical hoop (14);
    the two free edges of the hoop (14) are welded together;
    at least one cylindrical flow spinning operation is performed to obtain a profile of given thickness of the hoop (20, 25, 26), zones of constant thickness being adjacent to zones of variable thickness;
    the hoop (20, 25, 26) is profiled to obtain the rim (2); and
    the size of the said rim (2) is set;
    characterised in that, after the step of cylindrical flow spinning and before the step of profiling the hoop, a cut is made perpendicular to the axis of the hoop (20, 25, 26) out of at least one lateral edge of the hoop (20, 25, 26), the plane of cutting out of the edge of the hoop (20, 25, 26) being defined with reference to a characteristic point on the profile of the hoop (20, 25, 26) after the flow spinning operation, the said characteristic point corresponding to a point of transition between a zone of constant thickness and a zone of variable thickness.
  2. A method according to Claim 1, in which, with the rim (2) having an inner side and an outer side, the lateral edge of the hoop (20, 25, 26) corresponding to the inner side of the rim (2) is cut out.
  3. A method according to Claim 1, in which the two lateral edges of the hoop (20, 25, 26) are cut out.
  4. A method according to one of Claims 1 to 3, in which a part of the zone not subject to flow spinning (21, 27, 28) is cut out at the edge of the hoop (20, 25, 26).
  5. A method according to one of Claims 1 to 3, in which at least part of the zone subject to flow spinning is cut out at the edge of the hoop (20, 25, 26).
  6. A method according to one of Claims 1 to 5, in which, after the two free edges of the hoop (20, 25, 26) have been welded together, the size of the said hoop (20, 25, 26) is set.
  7. A method according to one of Claims 1 to 6, in which, after having set the size of the said rim (2), the zone of fitting the rim is machined.
EP01980534A 2000-11-13 2001-10-31 Method for making a vehicle wheel rim Expired - Lifetime EP1335805B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0014675A FR2816532B1 (en) 2000-11-13 2000-11-13 METHOD FOR MANUFACTURING A VEHICLE WHEEL RIM
FR0014675 2000-11-13
PCT/EP2001/012601 WO2002038303A1 (en) 2000-11-13 2001-10-31 Method for making a vehicle wheel rim

Publications (2)

Publication Number Publication Date
EP1335805A1 EP1335805A1 (en) 2003-08-20
EP1335805B1 true EP1335805B1 (en) 2004-10-13

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Application Number Title Priority Date Filing Date
EP01980534A Expired - Lifetime EP1335805B1 (en) 2000-11-13 2001-10-31 Method for making a vehicle wheel rim

Country Status (9)

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US (1) US6971173B2 (en)
EP (1) EP1335805B1 (en)
JP (1) JP4653932B2 (en)
AT (1) ATE279276T1 (en)
AU (1) AU2002212354A1 (en)
DE (1) DE60106477T2 (en)
ES (1) ES2230375T3 (en)
FR (1) FR2816532B1 (en)
WO (1) WO2002038303A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4076451B2 (en) * 2003-01-28 2008-04-16 トピー工業株式会社 Rim material for unequal thickness rim, unequal thickness rim, manufacturing method of unequal thickness rim
ITBS20030023A1 (en) * 2003-03-04 2004-09-05 Tecnoforming S P A METHOD OF CREATION OF THE CHANNEL FOR ALUMINUM ALLOY WHEELS.
JP3933143B2 (en) * 2004-04-28 2007-06-20 株式会社ワーク Wheel manufacturing method.
KR20110053224A (en) * 2008-11-18 2011-05-19 토피 고교 가부시키가이샤 Method of manufacturing tubular member
DE112011100571T5 (en) 2010-02-17 2012-12-13 Topy Kogyo Kabushiki Kaisha Method for producing a wheel rim for a vehicle
CN105215635A (en) * 2015-10-16 2016-01-06 江苏新创雄铝制品有限公司 The preparation method of a kind of cold working is seamless aluminium alloy wheel hub
DE102016117510A1 (en) * 2016-09-16 2018-03-22 Maxion Wheels Germany Holding Gmbh Method for the production of steep shoulder rims, steep shoulder rim and vehicle wheel herewith for commercial vehicles
KR101949029B1 (en) * 2017-08-08 2019-05-09 주식회사 포스코 Vehicle wheel

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US3129496A (en) * 1959-12-08 1964-04-21 Darwin S Cox Method of producing improved vehicle wheels
DE2624872C3 (en) * 1976-06-03 1988-03-24 Bohner & Köhle GmbH & Co, 7300 Eßlingen Process for producing undivided rims
US4185370A (en) * 1978-02-10 1980-01-29 Kelsey Hayes Co. Method of making a wheel rim
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US5579578A (en) * 1993-10-27 1996-12-03 Hayes Wheels International, Inc. Method for producing a rim for a vechicle wheel
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WO1996025257A1 (en) * 1995-02-13 1996-08-22 Hess Engineering, Inc. Method of forming vehicle wheel rims
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US6244668B1 (en) * 1998-10-30 2001-06-12 Specialty Blanks, Inc. Cold formed light alloy automotive wheel rim
DE19924062A1 (en) * 1999-05-26 1999-12-09 Leico Werkzeugmaschb Gmbh & Co Production system for vehicle wheels with steel rims

Also Published As

Publication number Publication date
ATE279276T1 (en) 2004-10-15
EP1335805A1 (en) 2003-08-20
AU2002212354A1 (en) 2002-05-21
US20040016124A1 (en) 2004-01-29
FR2816532B1 (en) 2003-01-24
DE60106477D1 (en) 2004-11-18
FR2816532A1 (en) 2002-05-17
WO2002038303A1 (en) 2002-05-16
DE60106477T2 (en) 2006-02-02
US6971173B2 (en) 2005-12-06
JP4653932B2 (en) 2011-03-16
ES2230375T3 (en) 2005-05-01
JP2004512963A (en) 2004-04-30

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