METHOD OF CORRUGATING METALLIC TUBES Russian patent published in 1995 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of continuous corrugating of tube with use of a flat annular plate, having an opening with a diameter, equal to a diameter of an initial tube, and mounted eccentrically relative to an axis of it motion, by continuous compression of the tube upon setting an angular velocity of the plate, equal to 0.3-0.6 V/H, where V- a linear speed of the tube motion; H a pitch of corrugating at an inclination angle of the plate relative to a plane of its rotation being no more, than arctgμ,, μ- a friction factor between the plate and the tube; a ratio of distances between inlet and outlet sleeves of the apparatus is equal to 2-4 diameters of the tube. EFFECT: enlarged using range of the method. 1 cl, 3 dwg