A process of straightening fragile pieces

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(11)

EP 1 127 632 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	06.03.2002 Bulletin 2002/10

(43)	Date of publication A2:
	29.08.2001 Bulletin 2001/35

(21)	Application number: 00203669.7

(22)	Date of filing: 20.10.2000

(51)	International Patent Classification (IPC)⁷: B21D 3/10

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

22.02.2000 IT MI200319

(71)	Applicant: Cesare Galdabini S.p.A.
	27029 Vigevano (Pavia) (IT)

(72)	Inventor:
	Galdabini, Luigi 27029 Vigevano (Pavia) (IT)

(74)	Representative: De Gregori, Antonella et al
	Ing. Barzano & Zanardo Milano S.p.A. Via Borgonuovo 10 20121 Milano 20121 Milano (IT)

(54)	A process of straightening fragile pieces

(57) A process for straightening fragile pieces (11), which includes a phase for calculating the maximum eccentricity error (E) of the piece (11) to be straightened, and a multiple number of phases for reducing the error in at least three directions, where the maximum eccentricity error (E) previously calculated is split up into at least three component vectors (R1, R2, R3), where the component (R1) is oriented in the direction of the maximum error (E), while the components (R2) and (R3) are oriented with respect to the component (R1) by an angle of ± α°, and where the straightening phases are performed in the direction of the components (R1, R2, R3), with an intensity of blows proportional to the component modules (R1, R2, R3), by appropriately rotating the piece to be straightened (11) by ± α° with respect to the direction of the maximum error (E), so that the same is oriented, from time to time, in the direction of the components (R1, R2, R3).

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