METHOD FOR OUTJECTING PRINTING OF THIN-WALLED AND SEAMLESS PIPE BOWS FROM ANY BOW RADIUS PIPE ANGLE AND TUBE DIAMETER FROM A THICK WALL PIPE WITH OR WITHOUT CYLINDRICAL TUBE PADS AND MACHINE CONNECTING TO THE TUBE BELT FOR IMPLEMENTING THE METHOD

摘要

1. A method for spin-forming thin-walled seamless tubular elbows with any desired elbow radius, elbow angle and tube diameter from a short and thick-walled tubular blank material using a rotatable tubular elbow corepiece, characterized in that the short and thick-walled tubular blank material has the form of a section of a segment with a curvature matching the curvature of the tubular corepiece and that the blank material is fitted over the tubular corepiece and is rotated together with said corepiece according to corresponding tubular elbow radius arch-like between and through pressing rollers of a rotating pressing roller head rotating around the blank material for acting thereon, with said rotating pressing rollers acting with flow pressure onto the rotating blank material so that the same is stretched out and rolled out into a thin-walled sheet metal tubular elbow with its length elongated to many times the length of the blank material.