Patent ID: 6550300
Filing Date: 2003-04-22
Classification: B21C,B21D

Abstract:
An apparatus for producing annularly corrugated metal tubes, comprising:at least one pressure roller revolving around a plain tube, wherein the corrugations are formed in the plain tube by teeth of the pressure roller, the pressure roller is rotatable about an axis at substantially a 90Â° angle with respect to a longitudinal axis of said tube, and the axis of rotation of said roller, itself in a plane perpendicular to said longitudinal tube axis, revolves around the plain tube being fed to the pressure roller as the corrugations are produced, with the plain tube in turn rotating the pressure roller by its feed, wherein the tips of said teeth are substantially flat, said tube is tightly guided in a guide bushing prior to and subsequent to engagement with the pressure roller, and the number of said teeth ranges between 7 and 11.