Process and apparatus for continuous production of corrugated metal pipe with parallel ridges

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(11)

EP 1 088 605 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	16.01.2002 Bulletin 2002/03

(43)	Date of publication A2:
	04.04.2001 Bulletin 2001/14

(21)	Application number: 00120973.3

(22)	Date of filing: 27.09.2000

(51)	International Patent Classification (IPC)⁷: B21C 37/20

(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:

01.10.1999 IT MI992053

(71)	Applicant: Olimpia 80 SRL
	27026 Garlasco (PV) (IT)

(72)	Inventors:
	Brega, Giuseppe 29011 Borgonovo V.T. (PC) (IT) Travini, Vittorio 27020 Borgo S.Siro (PV) (IT)

(74)	Representative: Zavattoni, Maria Chiara et al
	Racheli & C. S.p.A. Viale San Michele del Carso, 4 20144 Milano 20144 Milano (IT)

(54)	Process and apparatus for continuous production of corrugated metal pipe with parallel ridges

(57) A metal pipe (T) is fed at a first speed into a space between delimited successive contiguous mechanical corrugators (34, 38), each of which turns around an axis coinciding with the axis of the pipe (a) and is disposed eccentrically with respect thereto and has a spiral inner corrugating surface with its axis (b, c) offset with respect to the axis of the pipe and a diameter greater than the diameter of the pipe. The corrugated pipe (TC) is extracted at a second speed lower than the first speed.
An appropriate coordination between the input speed, the output speed and the pitch of the spirals of the corrugating fixtures allows corrugated metal pipes with parallel annular ridges to be produced continuously.

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