The working principle of a stretch bending machine seems complicated, but it can be simply summarized as "stretching first, then bending, and synchronous forming". First, fix the profile to be processed on the fixture of the equipment, and apply uniform pre-tension to the profile through the stretching mechanism to make the profile in a slightly stretched state; then, the bending mechanism drives the profile to bend slowly, and the tensile force and bending force act synchronously to ensure that the profile is evenly stressed during the bending process without local wrinkling or fracture; finally, maintain the tensile force for a period of time, and after the profile is shaped, loosen the fixture to complete the entire stretch bending operation, which not only ensures the accuracy of the radian but also retains the mechanical properties of the profile itself.