Structural Optimization Design of Cylindrical Grinding Machine Tool Bed

摘要

This paper aims at the structural design optimization problem of a cylindrical grinding machine tool bed structure, so as to make it possible to obtain an eco-efficient structure. The optimum design process includes three phrases.Firstly, the static stiffness of the original bed is analyzed by the finite element method. Then several defects are found and specific improvement approaches are taken action.As a result, a modified bed structure is obtained.Its stiffness is better, and its mass is lighter.Secondly, the positions of the stiffener plates inside the modified bed structure are optimized by topology optimization method. The optimization result shows that four stiffener plates should be located inside the bed structure.Finally, the sizing optimization is implemented to achieve the lightest structure.Several dimension variables that contribute to the mass and strain energy of the bed structure more critically are selected by design of experiment.And the mathematical model is constructed to optimize the bed structure. The sequential quadratic programming algorithm is adopted to solve the problem, and the optimal bed structure is obtained.By reanalyzing the optimal bed structure, its stiffness is 2.49 times better than of the original one, and its mass is in reduction by 22.14%.