(19)
(11) EP 2 826 571 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
22.04.2015 Bulletin 2015/17

(43) Date of publication A2:
21.01.2015 Bulletin 2015/04

(21) Application number: 14174834.3

(22) Date of filing: 27.06.2014
(51) International Patent Classification (IPC): 
B21D 22/24(2006.01)
B21D 53/26(2006.01)
 B21D 37/02(2006.01)
B21K 1/42(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 28.06.2013 IT TO20130533

(71) Applicant: Agla Power Transmission S.p.a.
Avigliana (IT)

(72) Inventors:
  • Bonú, Oscar
    10051 Avigliana (IT)
  • Bonú, Stefano
    10051 Avigliana (IT)

(74) Representative: D'Angelo, Fabio et al
Studio Torta S.p.A. Via Viotti, 9
10121 Torino
10121 Torino (IT)

   


(54) Method for manufacturing a pulley for motor vehicle applications


(57) The invention relates to a method for manufacturing a pulley (1) for motor vehicle applications starting from a plane disk (21), which has a central axis (A) and defines a reference plane (P) orthogonal to said axis (A); the method comprises the steps of: bending an annular peripheral portion (51) of the disk (21) in a direction transverse to the reference plane (P) so as to define a rim (59) in relief; deforming, in a first axial direction (S), a central portion (52) of the disk (21) so as to generate a first cup-shaped portion (53); deforming, in a second axial direction (T) opposite to the first direction (S), a central portion of the first cup-shaped portion (53) so as to generate a second cup-shaped portion (86) axially projecting from the opposite side of the reference plane (P) with respect to the rim (59); reducing the axial height of the second cup-shaped portion (86) with respect to the reference plane (P) so as to increase the thickness thereof; and carrying out a coining operation on a surface (13) of the second cup-shaped portion (86) that is parallel to the reference plane (P) and faces the opposite side of the reference plane (P) itself to generate a plurality of radial impressions (15).







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