Abstract: The column is an important part of machine,that supporting the spindle box,ram,beams and other components,it has significant influence on machining accuracy of machine tool.Taking the stiffened plate structure,stiffened plate thickness as design variables,taking the quality of the column as the main evaluation index and the deformation,the first-order frequency as secondary evaluation index.Eight kinds of stiffened plate structure of the column were established and analyzed by 3D design software SolidWorks and finite element analysis software ANSYS,preliminary screening out the “O” type stiffened plate structure is the optimal solution,and then different thickness of rib plate of the “O” type column were designed and analyzed.The results show that “O” type rib stiffened plate with thickness of 14mm has the optimal comprehensive performance,the deformation is unchanged,but weight reduced 352kg and the first-order frequency is increased by 1.6%.

Key words: gantry machining center, column, lightweight, ANSYS software, finite-element analysis