关键词: 刀具磨损, 高斯过程, 铣削, 加工精度, 可靠性分析, 优化设计, 工艺参数

Abstract: Aiming at the problems of low machining accuracy and short tool life in the milling process of difficult-to-cut materials,the reliability model of machining accuracy considering tool wear was established,and the accuracy reliability analysis and process parameters optimization were carried out.Gaussian process was used to characterize the dynamic error caused by tool wear,and the reliability model of machining accuracy was established by combining the driving error of BC-axis machine tool with the tool manufacturing error.The single-loop Kriging surrogate modeling for time-dependent reliability analysis method was used to solve the reliability value.With machining efficiency as the optimization object and reliability of machining accuracy and tool life as the constraint condition,the model of optimization design was proposed.The sequential quadratic programming method was used to obtain the optimum process parameters.The results proved that the machining efficiency was improved by 11.10%,the reliability of machining accuracy and tool life reached 99.29% and 42.37min respectively after optimization design,which provided an effective method for the selection of process parameters in the milling process of difficult-to-cut materials.

Key words: tool wear, Gaussian process, milling, machining accuracy, reliability analysis, optimization design, process parameter