C_(pk)写控制图的研究与应用

C_(pk) and control chart and their applications

控制图与过程能力指数Cp(Cpk)都是用来进行质量分析与处理的重要工具。文 [1]谈及控制图的两类错误 (其概率分别为α、β) ,文 [2 ]讨论了Cpk与α的关系 ,但涉及Cpk与控制图检出力 (1- β)关系的文章却不多。本文以 X控制图为例 ,讨论了α、β、1- β、与Cpk的关系 ,得出了联合应用它们会对工序状态有较好的了解 。

Control chart and Process capability index C p(C pk )are important tools for quality analysis and treatment.The probability α,β of Type Ⅰ,Ⅱ error were talked about in [1],the relationship between C pk and α was presented in [2],but few papers about the relations between C pk and the detecting power(1-β).This paper studies relations among α,β,(1-β)and C pk at last a numerical illustration is also given.