(19)
(11) EP 2 192 017 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
25.01.2012 Bulletin 2012/04

(43) Date of publication A2:
02.06.2010 Bulletin 2010/22

(21) Application number: 09177242.6

(22) Date of filing: 26.11.2009
(51) International Patent Classification (IPC): 
B61F 5/52(2006.01)
H05B 6/40(2006.01)
 B21D 1/14(2006.01)
H05B 6/02(2006.01)
(84) Designated Contracting States:
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 SE SI SK SM TR
Designated Extension States:
AL BA RS

(30) Priority: 26.11.2008 EP 08425762

(71) Applicant: ANSALDOBREDA S.p.A.
80147 Napoli (IT)

(72) Inventors:
  • Buonanno, Paolo
    80147 Napoli (IT)
  • Gailli, Gualtiero
    80147 Napoli (IT)
  • Mazzone, Beniamino
    80147 Napoli (IT)
  • Scognamiglio, Raffaele
    80147 Napoli (IT)

(74) Representative: Jorio, Paolo et al
Studio Torta S.p.A. Via Viotti, 9
10121 Torino
10121 Torino (IT)

   


(54) Method of straightening and calibrating a railway bogie frame by means of magnetic induction heating


(57) A method of straightening and calibrating a railway bogie frame (1) carried out by reciprocally connecting, by means of electric welding operations, metal portions shaped by means of previous production cycles; during the electric welding operations, the metal material undergoes a thermal cycle which produces melted zones and thermally altered zones (Z) in which residual strains introduced by rapidly heating/cooling the metal are present. The frame is then subjected to a step of heating in a furnace which does not completely eliminate the distortions in the frame because some parts thereof may not be aligned with respect to the nominal shape. The method of straightening and calibrating by heating comprises the step of applying loads to the frame and punctually heating at least one portion of the frame itself by arranging an inductor (20) facing the portion and feeding an alternating current to the inductor (20) so as to generate induced currents in the metal portion facing the inductor (20); such induced currents close in the metal portion, which is heated in a concentrated, punctual manner by Joule effect. (Figure 2)







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