Study on Method for Weak Part Identification of Dynamic Stiffness of a Five-Axis Gantry Machine Center Based on Kinematics Simulation

A research method is proposed to identify the weak part of dynamic stiffness of a five-axis gantry machine center based on kinematics simulation. The virtual prototype model of rigid-flexible coupling of five-axis gantry machining center was established by using CAE software, and kinematic simulation was conducted on the rigid-flexible coupling virtual prototype model of different components. The average, standard deviation, maximum and final error of the offset of the machining center during tool tip movement were used as evaluation criteria to evaluate the degree of influence of different components on the dynamic stiffness of the five-axis gantry machining center. Compared with the results of simulation analysis, it is found that the dynamic stiffness of the slide and beam structural members in the X and Z directions of the machining center is weak, and the dynamic stiffness of the ram in the Y direction of the machining center is weak. Finally, by optimizing the material of the slide structure, the dynamic stiffness performance of the machining center is greatly improved, and the accuracy of the identification method is verified.