TUBES WITH HELICAL CORRUGATIONS PRODUCTION APPARATUS Russian patent published in 2006 - IPC B21D15/04 

FIELD: plastic working of metals.

SUBSTANCE: apparatus includes shaping discs mounted in housing around axis of apparatus and inclined relative to said axis. Said discs are mounted with possibility of rotation around their own axes and they have peripheral working surface corresponding to recesses of corrugations. Working surface is provided with periodically arranged convexities and recesses and it is made with possibility of changing it without dismounting of shaping disc. Convexity may be in the form of spike that may be in the form of truncated cone whose large base is secured to working surface and small base is in the form of convex semi-sphere. Contour of recess may correspond to that of corrugation. Working surface may be formed on rim that may be mounted onto shaping disc with use of detachable joint.

EFFECT: enlarged manufacturing possibilities, improved efficiency of apparatus.

7 cl, 12 dwg