Crossbeam Structure Optimization Using Orthogonal Experimental Combined Weighting Method

The machining quality of the gantry machining center is directly impacted by the structural performance of the crossbeam, which is one of its key moving components. The optimization of the overall performance of the crossbeam is aimed to be achieved through the conduct of finite element analysis and the utilization of orthogonal experimental methods, along with a combination weighting approach to strengthen the quantitative data analysis. The research investigates the influence of different design approaches on the rigidity and vibration characteristics of the crossbeam. By integrating structural optimization and data analysis, a well-rounded crossbeam design solution with superior overall performance is proposed. Following optimization, the beam's mass was reduced by 205.6kg, a decrease of 9.4%, maximum deformation reduced by 0.0143mm, a decrease of 50%, maximum equivalent stress decreased by 0.839MPa, a decrease of 7.4%, and simultaneously, the first-order natural frequency increased by 7.541Hz, a rise of 26.29%. Through effective optimization, the crossbeam's static and dynamic performance improved while achieving lightweight design under the premise of ensuring rigidity.