TUBE BENDING MACHINE Russian patent published in 2003 - IPC

FIELD: machine engineering, possibly manufacture of branch pipes. SUBSTANCE: tube bending machine includes frame; insert with diameter of working cavity equal to outer diameter of tubular blank; drive unit for rotating insert relative to bending axis; slide; guiding beam and mandrel. Inside mandrel additional spoon-like mandrel is arranged. Mandrel has support; torsion spring is mounted between end of slide and support of mandrel. Power hydraulic cylinder whose rod is joined with mandrel is mounted on frame. Hydraulic cylinder whose rod is joined with spoon-like mandrel is mounted on insert. Drive unit for rotating insert around bending axis may be in the form of driven gear wheel mounted in frame and having rotation drive mechanism. In such case insert may be fixed to driven gear wheel. In variant of invention insert is mounted with possibility of reciprocation motion in guides of additional beam secured to driven gear wheel. Drive unit for rotating insert around bending axis may be in the form of hydraulic cylinder jointly mounted in frame and inclined relative to axis of slide. EFFECT: enlarged manufacturing possibilities. 6 cl, 7 dwg