EP 0078485 B1 19851002 - METHOD OF MANUFACTURING A HELIX
Title (en)
METHOD OF MANUFACTURING A HELIX
Publication
Application
Priority
DE 3143751 A 19811031
Abstract (en)
[origin: EP0078485A1] 1. A process of manufacturing a helical coil, particularly a helically coiled exhaust gas duct, from a planar metal strip (1), which has corrugations (3) extending transversely to its longitudinal direction and which is twisted, characterized in that only the intermediate region of the sheet metal strip (1) is corrugated, the corrugations (3) are formed by means of a gearlike double roller tool, and the corrugations (3) extend relative to the longitudinal axis of the metal strip at an angle which differs from 90 so that the metal strip (1) follows the twist so as to dissipate the stresses applied by the formation of the corrugations (3).
IPC 1-7
IPC 8 full level
B21D 11/14 (2006.01); B21D 13/04 (2006.01); F23M 9/08 (2006.01); F24H 9/00 (2006.01); F28F 13/12 (2006.01)
CPC (source: EP)
B21D 11/14 (2013.01); B21D 13/04 (2013.01); F23M 9/08 (2013.01); F24H 9/0026 (2013.01); F28F 13/12 (2013.01)
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0078485 A1 19830511; EP 0078485 B1 19851002; AT E15866 T1 19851015; DE 3266710 D1 19851107
DOCDB simple family (application)
EP 82109867 A 19821026; AT 82109867 T 19821026; DE 3266710 T 19821026