spc訓(xùn)練教材(文件)
【正文】 LSL USL 12s .001ppm .001ppm =Tolerance ST C p = There must be at least 6sST between the process average and either specification limit when the process average is at the middle of the tolerance. 12sST must fit in the tolerance (as shown above). The six sigma goal for CP bees: CP, GOAL = Tolerance/ 6sST = 12sST, GOAL / 6 sST, GOAL = To acmodate process shifts of up to +/ , the minimum distance allowed between the process average and either specification limit that still achieves a performance capability goal of ppm is sST, GOAL CPK, GOAL = (1/ 3sST, GOAL ) Minimum (m LSL, USL m) = (1/ 3sST, GOAL )( , GOAL ) = 何謂 6 s Quality? 樣本平均值 (Mean) 與 樣本標(biāo)準(zhǔn)差 (Sample standard deviation) 例 : ﹛ 4,5,5,4,8,4﹜ 5484554 ??????X nXiXni 1???平均值 標(biāo)準(zhǔn)差 niXXin12)(11?????s512?s計量值管制圖 計數(shù)值管制圖 UCL LCL CL UCL LCL CL Xbar Chart R Chart Xbar distribution 6σ ^ X 以自然公差概念 , 依目前製程能力設(shè)定新管制界限 , 取代規(guī)格界限以改善品質(zhì) USL LSL T =USLLSL
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