Bending forming method for multi-segment bent pipe section

The invention relates to a bending forming method for a multi-segment bent pipe section, belongs to the technical field of bending forming and relates to inventions of clamping methods. The bending forming method is characterized in that through a clamping method, bending of a non-straight-line-segment bent pipe which cannot be bent on a pipe bending machine before is achieved on the pipe bending machine in the mode that the non-straight-line-segment bent pipe is clamped through a novel bending die. The specific bending forming method comprises the following steps that after bending of a first curve is achieved on the pipe bending machine through an original bending die, the novel bending die (a pipe bending die body and a clamping block) replaces the original bending die to clamp and bend the bent pipe. The bent pipe is placed in around cavity formed by the pipe bending die body and the clamping block of the novel bending die, the pipe bending die body and the clamping block of the novel bending die are clos