Rotary Bending Process and Parameter Optimization of Rectangular Tube with Variable-Section

Aiming at the bending process of ordinary rectangular tube, the influence of parameters such as friction coefficient, corner radius of tube blank, and rotational speed of bending die on the bending defects was studied. The traditional rotary bending process was improved and proposed the non-mandrel anti-compensation process. For the variable-section rectangular tube, a variable-radius bending die was designed. For a certain size of variable-section rectangular tube, the anti-compensation parameters of each part were optimized. Take the minimum of internal folding and external depression as the optimization goal, the influence law of different parameters was obtained, and two sets of optimization parameters were obtained. Then, the two sets of parameters were analyzed using the comprehensive equilibrium method. Finally, a set of optimal process parameters was obtained.