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中文摘要：
为了对数控机床故障率分布曲线进行定量研究,对数控机床的故障数据作威布尔线性回归分析,由威布尔概率图分析结果,运用两重威布尔分段模型建立了包含早期故障期和偶然故障期的数控机床故障率分布曲线,阐述了模型建立的方法和利用极大似然法估计参数的过程,确定了早期故障期持续时间,通过与实际使用情况比较验证了该模型的正确性。最后,利用该模型构造目标函数,对保修期进行研究,得出了数控机床最优保修期。
英文摘要：
To quantitatively study the distribution curve of CNC machines,the Weibull linear regression using the failure data of CNC machines is analyzed.As the result of analyzing WPP（Weibull probability plot）,the failure rate distribution curve which includes early failure period and random failure period is established by piecewise twofold Weibull model.The establish method of the model and the process of parameter estimated by maximum likelihood are explained.The correctness of the model is verified by comparing the lasting time of early failure period with the actual situation.The optimization warranty of CNC machines is obtained by an object function which is established by the model.
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