Process and apparatus for the production of light alloy tubing of larger diameter starting from tubing of smaller diameter

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EP 0 432 485 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	03.07.1991 Bulletin 1991/27

(43)	Date of publication A2:
	19.06.1991 Bulletin 1991/25

(21)	Application number: 90121705.9

(22)	Date of filing: 13.11.1990

(51)	International Patent Classification (IPC)⁵: B21D 41/02

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB GR IT LI LU NL SE

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Priority:

15.11.1989 IT 2238689

(71)	Applicant: VIS S.R.L.
	I-21047 Saronno (Varese) (IT)

(72)	Inventor:
	Zaffaroni, Orlando I-22078 Turate (IT)

(74)	Representative: Gervasi, Gemma, Dr. et al
	NOTARBARTOLO & GERVASI Srl Viale Bianca Maria 33 I-20122 Milano I-20122 Milano (IT)

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References cited: :

(54)	Process and apparatus for the production of light alloy tubing of larger diameter starting from tubing of smaller diameter

(57) Production of light alloy tubing of larger diameter starting from tubing of smaller diameter comprising the following operations:

a) A tube having a diameter from 100mm to 400mm is introduced in a mandrel (1),

b) the mandrel (1) is rotated, and

c) the tube (12) is compressed by a pressing roller (2) against the inner part of the mandrel (1).