Abstract

To solve the problem of precise control of clamping die during the pipe bending process, this study utilizes DEFORM-3D software to perform finite element analysis on the pipe bending process of $\boldsymbol{\phi} \mathbf{65}\times \mathbf{3}$ pipes. The torque simulation values of the clamping die during the pipe bending process are investigated, and their comparison with theoretical values ultimately reveals a good agreement, confirming the reliability of the model. Based on the optimal values for the clamping die axis retention torque, a control strategy is proposed, combining servo motor position control with torque control to optimize the clamping die axis. This approach effectively addresses issues in actual production where excessive clamping force leads to markings and deformation of the pipes. This study presents a new control method for precise bending forming of pipes, offering important theoretical and practical value for enhancing the bending performance and forming quality of pipe bending machines.