FIELD: plastic metal working, possibly manufacture of tubular products with grooved seam. SUBSTANCE: apparatus includes pair of rollers for preliminarily folding edges one inside another, two pairs of rollers with vertical axis for finish bending with profiled working surfaces and with inclined beads, pair of rollers with horizontal axis for flattening folded edges. All rollers have round gages corresponding to tube diameter. Rollers for preliminarily folding are mounted on horizontal axles. Upper roller for preliminarily folding has wedge annular groove in bottom of said gage. Inclination angles of second and third pairs of rollers for finish bending are equal to 10-15 and 60-70 degrees respectively. EFFECT: improved design.
