Pipe bending die for pipe bending machine

The invention belongs to the technical field of machining. A pipe bending die for a pipe bending machine comprises a bending die and a clamping die, and the clamping die is matched with the front end of the bending die to clamp a pipe fitting; a fixed clamp block mounting seat is arranged at the front end of the bending die and provided with a plurality of fixed clamp blocks at intervals, and the clamping die is composed of a movable clamp block mounting seat and a plurality of movable clamp blocks arranged on the movable clamp block mounting seat at intervals. The movable clamp blocks and fixed clamp blocks are arranged in pairs, and the sum of the length of the movable clamp block and the length of the fixed clamp block of each pair is the same. Notches are formed in the opposite head faces of the fixed clamp blocks and movable clamp blocks, and the notch in each fixed clamp block is abutted to the notch in the corresponding movable clamp block to form a through hole. The centers of the through holes are located on the same circular arc line. The pipe bending die for the pipe bending machine changes the linear clamping into curved clamping, the state of the stress of the pipe bending die to the surface of a bent pipe is improved, and the surface quality problem of the bent pipe due to a current continuous bending fixture is solved; the universality is strong.