High performance machine with thermal compensation for programmed sheet bending with constant bending angle

(19)

(11)

EP 1 304 178 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	13.04.2005 Bulletin 2005/15

(43)	Date of publication A2:
	23.04.2003 Bulletin 2003/17

(21)	Application number: 02079262.8

(22)	Date of filing: 16.10.2002

(51)	International Patent Classification (IPC)⁷: B21D 5/00

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

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Priority:

22.10.2001 JP 2001006860 U

(71)	Applicant: SALVAGNINI ITALIA S.p.A.
	I-36040 Sarego (Vicenza) (IT)

(72)	Inventor:
	Kunze, Wolfgang 4060 Leonding (AT)

(74)	Representative: Mittler, Enrico et al
	Mittler & C. s.r.l., Viale Lombardia, 20 20131 Milano 20131 Milano (IT)

(54)	High performance machine with thermal compensation for programmed sheet bending with constant bending angle

(57) A sheet metal bending machine is provided with a bending unit (8) moved by hydraulic cylinders (12, 15) with sliding pistons (20, 21). The cylinders (12, 15) are controlled by a closed loop control system comprising temperature measuring means (18) for measuring the cylinder temperature, position detecting means (19) for detecting the piston position and a control unit (17) for varying the rate of hydraulic fluid fed to the cylinders (12, 15) according to the measured cylinder temperature and the detected piston position.

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