Towards Lightweight Spindle of CNC Lathe Using Structural Optimization Design for Energy Saving*

The spindle system of computer numerical control (CNC) lathe is the principal energy consumer in the machine tool operating stage. Structural optimization design of spindle is regarded as an effective strategy for energy saving. Compared with previous optimization design methods for improving deformation, vibration and other traditional performance indicators of spindle, this paper proposes a method comprehensively considering energy consumption and traditional performance. Firstly, we bulid an energy consumption function of spindle. Structure parameters that have the great influence on the indicators are selected as decision variables. Then, a comprehensive performance objective is determined. Finally, a hybrid algorithm is developed to solve the optimization model. The results show that the optimized structure can decrease the energy consumption while ensuring the static and dynamic performance.