Flexible die for two-dimensional and three-dimensional stretch bending forming of section bar

The utility model provides a flexible die for two-dimensional and three-dimensional stretch bending forming of a section bar, which comprises an outer die with an arc recess and an inner die with an arc protrusion, and the outer die and the inner die are matched with each other through the matching of the arc recess and the arc protrusion to realize the arc surface matching. Wherein the outer dieis composed of a plurality of outer die unit blocks arranged side by side, the inner die is composed of a plurality of inner die unit blocks arranged side by side, every two adjacent outer die unit blocks are elastically connected, every two adjacent inner die unit blocks are elastically connected, and a containing cavity for containing a profile to be machined is formed in the side face of the inner die. When the three-dimensional stretch bending machine is used, the sectional material is placed in the containing cavity, the two ends of the sectional material are installed on the machine headof the two-dimensional ro