The invention discloses a double-tool stretching seat structure of a
servo numerical control stretch bender, which comprises a base, a single stretching seat and a clamp seat are arranged on the base, the double seats are arranged in parallel, and the center distance deviates towards the inner side of the base by a
set distance to form an inner deviation type double-tool structure. The single stretching seat and the clamp seat are connected with the base in a sliding mode through a linear guide rail and controlled by a
ball screw driven by a
servo motor to move, and synchronous or asynchronous movement can be achieved. The clamp seat drives the movable clamping jaw to clamp a workpiece through the
hydraulic cylinder, and the reset spring assists the clamping jaw to reset. The small-
radius stretch bending
machine is novel in structural design, solves the problem of forming interference during small-
radius stretch bending of large-section profiles, is matched with a
servo numerical control system to achieve high-precision
motion control, has the advantages of being simple in structure, convenient and fast to operate, stable in clamping, high in
machining precision and the like, and is suitable for popularization and application. And the
processing capacity of the large-
tonnage stretch bender on complex profiles is obviously improved.