关键词: 数控机床, 动力学模型, 加工工艺参数, 多目标优化, 网格寻优算法

Abstract: To improve the machining process quality and efficiency of heavy-duty Computer Numerical Control(CNC)machine tools, a machining process parameters optimization method based on the combination of numerical simulation and optimization algorithm was proposed. By building a nonlinear dynamic model for heavy-duty CNC machine tools-machining process, the mapping relationship of machining process parameter with surface roughness was set up. Taking process parameters as decision variables, and surface roughness as well as machining size accuracy as objective function to establish heavy-duty CNC machining process parameters multiobjective mathematical optimization model, and direct grid optimization algorithm was used to solve the mathematical optimization model. Thus the optimal machining process parameters combination of heavy-duty CNC machine tools was obtained. A heavy-duty CNC milling process was taken as an example to show the superiority of the multiobjective optimization method by comparing the results of single-objective optimization.

Key words: CNC machine tools, dynamics model, machining process parameters, multiobjective optimization, grid optimization algorithm