中文摘要：

可转位刀具在断续切削加工时，其主要失效形式是疲劳破损．刀具各设计参数的选取直接影响刀具的可靠度．以应力一强度干涉模型为基础，建立了可转位刀具的动态可靠性数学模型，给出了刀具在切削加工时的可靠度变化规律．在此基础上与灵敏度分析方法相结合，推导了刀具各设计参数的动态可靠性灵敏度计算公式，并给出了各设计参数的动态可靠性灵敏度的变化曲线．研究表明，刀具各设计参数的改变对其可靠性的敏感程度大小不一，对敏感参数的选取要加以控制，以提高刀具的可靠度和被加工零件的精度．同时为提高刀具系统及整个机床的可靠性提供理论依据．

英文摘要：

In the interrupted cutting process, the main failure mode of the indexable cutting tool is endurance failure. The selection of design parameters of the cutting tool is important, which has direct effect on its reliability. A mathematical model of the dynamic reliability for hard alloy cutter was successfully built based on the stress-strength interference model, and the change rule of its reliability in the machining period was also obtained. Combining with sensitivity analysis method, the computational formulas of the dynamic reliability sensitivity and the change curves of design parameters were derived. The study shows that due to the different sensitive degree of design parameters to the cutting reliability, the selection of sensitive parameters should be controlled so as to improve reliability of the cutting tool and the accuracy of the processed accessory. Meanwhile, the proposed method provides a theoretical basis for enhancing the reliability of the tool system and the whole machine tool.