DIE SET FOR BENDING TUBES Russian patent published in 1997 - IPC

FIELD: tube bending in machine engineering. SUBSTANCE: die set includes upper plate on which punch with forming impression is mounted and lower plate with die unit having two die halves with changeable impressions. One of said die halves is rotary. Die set is provided with counterpressure members in the form of buffer and two screw-pushers. Punch is in the form of guiding jaws, spacing strip secured to said jaws, changeable cover plate with forming impression and changeable roller segment with forming impression. Struts of die unit are provided with spacing strip and parallel guides engaging with guiding jaws of said punch. Die halves are arranged in guides of said struts. Rotary die half is provided with return spring and movable rest. Other die half is provided with changeable bracket having fixing templates; it is mounted on counterpressure members with possibility of common motion along guides of struts. EFFECT: improved design. 8 dwg