基于性能退化的刀具可靠性评估

Performance Degradation-based Reliability Estimation for Cutting Tools

针对长寿命少失效样本条件下的可靠性评估问题,从性能退化角度分析了退化指标分布已知与未知条件下的性能退化路径的可靠度评估方法.以刀具为例,将其加工过程的刀具磨损量作为退化指标,建立了3种不同的退化路径模型,结合失效阈值,准确地估计出了刀具的伪失效寿命,并通过伪失效寿命数据分布模型进行了刀具的可靠性评估,对比分析了3种分布模型的可靠性指标差异,验证了该方法的有效性,为长寿命少失效样本条件下的设备可靠性评估提供了新的方法和思路.

In order to estimate the reliability of the equipments with long lifetimes and sparse failure samples, a reliability estimation based on performance degradation are analyzed.Under the different circumstances of degradation indix distribution is known and unknown,the degradataion estimation process are introduced based on degradation path models.The cutting tools are taken as study cases to prove the validity of the method.The wear values of cutting tools during operational process are selected as degradation indices to establish three different degradation path models.Combining with failure threshold,the pseudo-failure lives are assessed accurately.Based on the distribution models of pseudo-failure lives,the reliability of cutting tools is estimated.The reliability and distribution intervals of three different distribution models have been analyzed and compared.It is proved that the method is effective,so as to provide a new method of reliability estimation for the equipments with long lifetimes and sparse failure samples.