Structural analysis and optimization on crossbeam of heavy NC gantry moving boring & milling machine

In order to improve the work precision, the finite element models of crossbeam of heavy NC gantry moving boring & milling machine were established, and static/dynamic characteristics were analyzed. The crossbeam itself stiffness and the tip displacement converted by beam deformation under the largest cutting force and gravity load were calculated. According to the results of calculation and analysis, optimal structures of the crossbeam were designed, in which structure form and size were modified. And optimal structure was obtained by calculation crossbeam itself stiffness and crossbeam distortion of three schemes Kl, K2 and K3. The dynamic analysis results of the crossbeam show that the optimized structure improves the machine design accuracy and that can be a good reference for designing all kinds of machine tools.