EP1275449A1 - Procédé de fabrication d'une jante de roue de véhicule - Google Patents

Procédé de fabrication d'une jante de roue de véhicule Download PDF

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Publication number
EP1275449A1
EP1275449A1 EP02015064A EP02015064A EP1275449A1 EP 1275449 A1 EP1275449 A1 EP 1275449A1 EP 02015064 A EP02015064 A EP 02015064A EP 02015064 A EP02015064 A EP 02015064A EP 1275449 A1 EP1275449 A1 EP 1275449A1
Authority
EP
European Patent Office
Prior art keywords
roller
blank
tubular blank
axial length
outer roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02015064A
Other languages
German (de)
English (en)
Inventor
Mario Roetto
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.)
Esam SpA
Original Assignee
Esam SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Esam SpA filed Critical Esam SpA
Publication of EP1275449A1 publication Critical patent/EP1275449A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
    • B21H1/10—Making articles shaped as bodies of revolution rings of restricted axial length rims for pneumatic tyres
    • 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 present invention relates to a method for manufacturing a wheel rim for a motor vehicle, as defined in the preamble to Claim 1.
  • wheel rims for motor vehicles are produced from cylindrical blanks.
  • rims of constant thickness were produced by shaping cylindrical steel sheet blanks by multiple rolling operations which flared the edges thereof.
  • a tubular semi-finished piece or blank 10 of a uniform thickness s 1 having a cylindrical wall 11 of a first, predetermined axial length L 1 , is first calibrated, causing it to expand in a controlled manner until its internal diameter D 1 reaches a predetermined value which enables the blank to be force fitted, with some radial interference, onto the spindle of a flow-forming machine.
  • the spindle is then rotated, causing the blank also to rotate as a result of friction at the interface of the spindle with the blank.
  • a semifinished blank 10' (see Figure 2) is thus obtained being of an axial length L 2 greater than the initial axial length L 1 and one or more thinner and axially elongated areas 12.
  • the semifinished blank 10' is then flared at its axial edges 10a, 10b and finally put through a series of roll-forming operations which produce a rim 10'' with the required section, as shown in Figure 3 of the appended drawings.
  • Methods of the type described above involve a first disadvantage arising from the fact that they require a preliminary calibrating operation for stretching the inner diameter of the blank so that it can be force fitted onto the spindle, thereby preventing the blank from rotating relative to its rotating support during rotation of the spindle, thereby compromising the quality of the work.
  • the object of the present invention is to provide an improved method able to overcome the disadvantages of the above discussed prior art.
  • the invention provides a method which is more flexible, and which is able to produce rims of any diameter whatsoever with the same equipment.
  • the invention also provides a method which is more economical as it eliminates the need for the costly calibrating or expansion step required in the prior art before the blank can be spin-formed.
  • a tubular blank or partly finished piece is indicated 10, being of a uniform thickness s 1 , with a cylindrical wall of a predetermined axial length L 1 .
  • the tubular blank 10 is manufactured from a strip of steel sheet, of a width L 1 and a uniform thickness s 1 , which is cut into a required length in dependence on the diameter of the rim to be produced; the cut portion of sheet is then bent, its ends are welded edge to edge and the weld area then undergoes further operations (scraping, upsetting, shearing off excess metal, smoothing the edges of the weld area) which are not described here since they are well known in the art.
  • tubular blank 10 is loaded onto a spin-forming or fluoforming machine in which it is deformed by pressure from a forming roller 20.
  • the tubular blank 10 is inserted onto an inner counter roller, schematically indicated 21 and preferably of a length L 3 greater than the initial length L 1 of the tubular blank 10 and, even more preferably greater than the finished axial length L 2 of the semifinished blank at the conclusion of the spin-forming operation.
  • the external diameter D 2 of the inner counter roller 21 is significantly shorter than the inner diameter D 1 of the tubular blank 10.
  • An outer motor-driven roller 22 is driven for rotation about an axis X 22 parallel to the axis X 21 of the inner counter roller 21.
  • the outer roller 22 is urged into contact with the outer cylindrical surface of the tubular blank 10, thus clamping the latter against the inner roller and using friction to rotate the blank 10 and the inner roller 21.
  • This latter can either be idle or alternatively, be driven for rotation in the opposite sense to that of the motor-driven roller 22.
  • the motor-driven roller 22 holds it in a precise axial position, preventing it from moving in an uncontrolled manner along the inner counter roller 21 under the action of the forming roller 20.
  • the outer roller 22 engages against an axial end of the tubular blank 10. It should be noted that the roller 22 can be longer axially than is shown in the example of Figure 4.
  • the movements of the roller 20 are controlled, in a manner which is known per se, in an axial plane (along an axial or radial direction).
  • the manufacturing and operating characteristics of the forming roller 20 are not in themselves relevant to understanding the invention and are therefore not described in detail here. It is sufficient to explain that in order to make the blank 10 thinner, the forming roller is moved radially, towards and away from the axis X 21 of the inner counter roller 21, while in order to determine the axial extent of the area to be made thinner, it is moved axially, parallel to the axis X 21 .
  • variable-section portions 13 in the rotating blank which join the portions 14 of a greater thickness S 1 and those 12 of the lesser thickness s 2 , as illustrated in Figure 2.
  • the outer motor-driven roller 22 can also be moved axially in order to enable the forming roller 20 or an additional forming roller (not shown), equivalent to the forming roller 22, to deform the area of the blank which the motor-driven roller 22 was engaged against at the start of the operation.
  • an additional forming roller (not shown), equivalent to the forming roller 22, to deform the area of the blank which the motor-driven roller 22 was engaged against at the start of the operation.
  • it can be removed from the inner counter roller and reinserted on it after being turned through 180°, so that the portion which was against the motor-driven roller 22 can be worked.
  • the semifinished tubular blank 10' On completion of the spin-forming step, the semifinished tubular blank 10' has an axial extent L 2 greater than its initial length L 1 .
  • the blank 10' is removed from the spin-forming machine and undergoes other operations, typically the flaring of one or both axial ends of the blank and roll-forming so as to give the rim the required section.
  • the method of the invention provides a convenient way to eliminate the conventional preliminary calibration operation, which is required in the prior art in order to fit the blanks onto conventional spin-forming machines.
  • the method of the present invention makes it possible to spin-form rims of any diameter and axial extent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Automobile Manufacture Line, Endless Track Vehicle, Trailer (AREA)
  • Testing Of Balance (AREA)
EP02015064A 2001-07-09 2002-07-05 Procédé de fabrication d'une jante de roue de véhicule Withdrawn EP1275449A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20010665 2001-07-09
ITTO20010665 ITTO20010665A1 (it) 2001-07-09 2001-07-09 Procedimento per la produzione di un cerchio per la ruota di un veicolo.

Publications (1)

Publication Number Publication Date
EP1275449A1 true EP1275449A1 (fr) 2003-01-15

Family

ID=11459032

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02015064A Withdrawn EP1275449A1 (fr) 2001-07-09 2002-07-05 Procédé de fabrication d'une jante de roue de véhicule

Country Status (2)

Country Link
EP (1) EP1275449A1 (fr)
IT (1) ITTO20010665A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE844587C (de) * 1949-04-10 1952-07-21 Ruhrstahl Ag Vorrichtung zur Herstellung von Tiefbettfelgen
US4909056A (en) * 1987-04-07 1990-03-20 Christian Ragettli Ag Method and an apparatus for cold-roll forming of annular workpieces
US4962587A (en) * 1989-04-21 1990-10-16 Kelsey-Hayes Company Method of making a wheel rim
WO1996025257A1 (fr) * 1995-02-13 1996-08-22 Hess Engineering, Inc. Procede de façonnage de jantes de vehicule

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE844587C (de) * 1949-04-10 1952-07-21 Ruhrstahl Ag Vorrichtung zur Herstellung von Tiefbettfelgen
US4909056A (en) * 1987-04-07 1990-03-20 Christian Ragettli Ag Method and an apparatus for cold-roll forming of annular workpieces
US4962587A (en) * 1989-04-21 1990-10-16 Kelsey-Hayes Company Method of making a wheel rim
WO1996025257A1 (fr) * 1995-02-13 1996-08-22 Hess Engineering, Inc. Procede de façonnage de jantes de vehicule

Also Published As

Publication number Publication date
ITTO20010665A1 (it) 2003-01-09

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