METHOD OF MANUFACTURE OF SPIRAL-SHAPED TUBE FROM STRIP AND DEVICE FOR ITS REALIZATION Russian patent published in 1994 - IPC

FIELD: metal pressure shaping, manufacture of mine anchors, gripping gears for agricultural machines, welded tubes of different diameters, etc. SUBSTANCE: method involves putting strip in feeding-and-braking mechanism and its pushing under first rollers of feeding mechanism, insertion of screw guide to the inside of shaping cylinder so that end face bearing spiral should be in place where strip enters tangential slit. Clamp is inserted by coaxial shaping cylinder. Strip enters the cylinder under rounded corners of clamp, caught by clamp and is pressed against walls of cylinder and is simultaneously drawn along walls of cylinder. Due to difference in linear speeds of rotation of clamp and rollers strip is converted to calibrated straightened tube. EFFECT: enhanced operating reliability. 2 cl, 6 dwg