CPK与PPK简单解析

PPKCPK原始数据计算0.911.66按照5个数据一个小组进行分组全数加50.851.56给每一个数据增大5调换个别小组内的数据0.911.43将均值最大的两组数与均值最小的两组数进行调整使4组均值接近平均值打乱数据分组0.911.59将全部数据的排列打乱,重新分组结论:1、全部数据增大5时，数据组的级差等未发生改变，但PPK值与CPK值均发生改变。说明极差对CPK值和CPK值无决定作用2、将均值最大的两组数与均值最小的两组数进行调整使4组均值接近平均值后，PPK值未发生变化，CPK值发生明显变化将全部数据的排列打乱,重新分组后PPK值也未发生变化，CPK值发生明显变化以上验证说明：PPK值仅与整体数据有关，与数据的分组、分布等无关。CPK值与数据的分组有很大关系，数据分组方式不同CPK值计算结果也不同。与PPK值配合使用的是分布图，与CPK值配合使用的是控制图（总体控制图及各小组均值控制图）。由以上结论联系PPK级CPK值得基本定义可知：PPK值反映的是一段时间内（连续取样）系统的稳定性和品质保证能力，反映的是实际工序的保证能力；CPK值反映的是系统在不同时间的变化过程中（长时间分段取样并建立数据组）工序保证能力的变化趋势；因：CPK值得计算要在系统稳定可控的前提下进行（PPk值无此要求）又：PPK值是系统/工序保证能力的衡量参数故：在进行CPK计算时，首先要保证系统稳定且系统的PPK值符合工序稳定性要求；其次，要对各组数据进行审核，排除异常数据（超差数据）后才能进行CPK值的计算在新生产线/工序进行保证能力评审时，我们需要的评审数据为PPK，而不是CPK，此时PPK需要满足的条件为：PPK≥1.66。在保证PPK满足要求后，为了验证随着生产的进行工序的保证能力是否发生变化，我们需要重新取样。将历史数据与新取样数据一同建立尽可能多地数据组，如此进行CPK值的计算，CPK≥1.33。PPK反映的是保证能力（多用来评估初始保证能力或长时间以来工序的保证能力）CPK反映的是变化趋势（多用来反映现阶段保证能力的变化）解析结论解析结论解析结论解析结论表05C.04-1742010数12345678910169.4067.0064.0070.0066.0065.0068.2063.6069.6073.40据265.8066.0065.0072.0064.0063.0068.6066.5070.0072.50366.0070.0068.0068.0072.0062.0065.5070.4067.6071.40处469.0068.0065.0069.0066.0070.0064.2074.8065.0068.00564.0071.0066.0065.0064.0068.0065.6068.0068.8069.60理XXXX66.8468.465.668.866.465.666.4268.6668.270.98DataRRRR5.4547884.411.255.4Processing11121314151617181920172.5070.5068.0067.0068.00265.4071.2069.0070.0065.60362.0068.6070.0071.0064.00467.5070.5072.0068.00565.0069.4066.0068.00XXXX66.4870.046968.865.8667#DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!RRRR10.52.664400000Processing21222324251234设备编号DieNo.日期Date2010.09.20工序名称ProcessName测量项目Items质量特性值QualityCdatavavleseatdepth工序能力指数测算表工序能力指数测算表工序能力指数测算表工序能力指数测算表ProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlist供应商Supplier：ContinentalWuhu70±10Vavleseatassembly零件号PartNo.3611500-D01-00零件名称PartNameBase,Vavleseat45XXXX#DIV/0!#######DIV/0!#DIV/0!#DIV/0!RRRR00000参数601.55632计算67.739113.62Parametercaculation2.8358465.6504CPK=R控制限7.65268标准差上控制限UCL=69.82785111下控制限LCL=1.66平均极差R上公差限USL80下公差限LSL公差中心TC70分布中心XPPK=0.91能力指数计算及判断R/d266.8468.465.668.866.465.666.4268.6668.270.9866.4870.046968.865.86667607080CPK计算范围PPK计算范围各数据小组均值的控制总体数据的控制图304050Series1Series2表05C.04-1742010数12345678910174.4072.0069.0075.0071.0070.0073.2068.6074.6078.40据270.8071.0070.0077.0069.0068.0073.6071.5075.0077.50371.0075.0073.0073.0077.0067.0070.5075.4072.6076.40处474.0073.0070.0074.0071.0075.0069.2079.8070.0073.00569.0076.0071.0070.0069.0073.0070.6073.0073.8074.60理XXXX71.8473.470.673.871.470.671.4273.6673.275.98DataRRRR5.4547884.411.255.4Processing11121314151617181920177.5075.5073.0072.0073.00270.4076.2074.0075.0070.60367.0073.6075.0076.0069.00472.5075.5077.0073.00零件号3611500-D01-00零件名称Base,Vavleseat供应商Supplier：ContinentalWuhu工序能力指数测算表工序能力指数测算表工序能力指数测算表工序能力指数测算表ProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlist日期2010.09.20工序名称Vavleseatassembly测量项目vavleseatdepth质量特性值70±10设备编号472.5075.5077.0073.00570.0074.4071.0073.00XXXX71.4875.047473.870.8667#DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!RRRR10.52.664400000Processing212223242512345XXXX#DIV/0!#######DIV/0!#DIV/0!#DIV/0!RRRR00000参数601.55632计算72.739113.62Parametercaculation2.8358470.6504CPK=上公差限USL80下公差限LSLR/d2公差中心70分布中心X平均极差RR控制限7.65268标准差上控制限UCL=74.82785111下控制限LCL=能力指数计算及判断PPK=0.851.56表05C.04-1742010数12345678910169.4067.0071.2070.0066.0065.0068.2063.6069.6062.00据265.8064.2070.5072.0064.0063.0068.6066.5070.0073.40366.0070.0068.0068.0072.0072.5065.5070.4067.6071.40处469.0068.0065.0069.0066.0070.0066.0074.8065.0068.00564.0071.0066.0065.0064.0068.0065.6068.0068.8069.60理XXXX66.8468.0468.1468.866.467.766.7868.6668.268.88DataRRRR5.46.86.2789.53.111.2511.4Processing11121314151617181920172.5065.0068.0067.0068.00265.4064.0069.0070.0065.60362.0068.6070.0071.0064.00467.5070.5072.0068.00零件号3611500-D01-00零件名称Base,Vavleseat供应商Supplier：ContinentalWuhu工序能力指数测算表工序能力指数测算表工序能力指数测算表工序能力指数测算表ProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlistProcesscapabilityindexmeasurementlist日期2010.09.20工序名称Vavleseatassembly测量项目vavleseatdepth质量特性值70±10设备编号467.5070.5072.0068.00565.0069.4066.0068.00XXXX66.4867.56968.865.8667#DIV/0!#DIV/0!#DIV/0!#DIV/0!#DIV/0!RRRR10.56.564400000Processing212223242512345XXXX#DIV/0!#######DIV/0!#DIV/0!#DIV/0!RRRR00000参数601.7988计算67.739114.184Parametercaculation2.8358465.3249CPK=上公差限USL80下公差限LSLR/d2公差中心70分布中心X平均极差RR控制限8.844976标准差上控制限UCL=70.15327911下控制限LCL=能力指数计算及判断PPK=0.911.43表05C.04-1742010数12345678910165.6067.0064.0070.0066.0065.0068.2063.6071.0073.40据265.8066.0065.0072.0070.4063.0066.0066.5070.0069.60366.0070.0068.0068.0072.0062.0065.5068.6067.6071.40处469.0062.0065.0069.0068.8070.0064.2074.8065.0068.00564.0071.0066.0065.0064.0068.0065.6068.0072.5069.60理XXXX66.0867.265.668.868.2465.665.968.369.2270.4DataRRRR594788411.27.55.4Processing11121314151617181920172.5070.5068.0067.0069.40265.4071.2067.5070.0068.00364.0068.6070.0069.0064.00468.0070.5072