NOKIA生产过程控制全球培训教材（三）.pptVIP

CpandCpkIndicesandDefects

(bothtailsofthenormaldistribution)Pp=Ppk=1,33?63ppmdefects=0,006%Cp=Cpk=1,67?0,6ppmdefects=0,00006%Note:PpmrejectratescalculatedfromCpCpkarebasedontheshorttermvariationwhichmaynotrepresentthelongtermrejectrate

TheEffectsofCpkandCponFFR

Exercise2:CpandCpkCalculateCpandCpkforthe100measurementsinthefileDataexercise1.xlsDeterminetheapproximateCpandCpkforthe4samplepopulationsonthefollowingpageShouldactionsbemadetoimprovetheseprocesses.Ifyes,which?

EstimateCpandCpk?Thewidthofthenormaldistributionsshowninclude±3*sLSLUSLA)LSLUSLB)LSLUSLC)USLLSLD)

EstimateCpandCpk?-A)LSLUSLA)MeanandnominalUSL-LSL6*sUSL-MeanMean-LSL3*s

EstimateCpandCpk?-B)LSLUSLB)NominalMeanUSL-LSL6*sUSL-MeanMean-LSL3*s

EstimateCpandCpk?-C)LSLUSLC)NominalMeanUSL-LSL6*sUSL-MeanMean-LSL3*s

EstimateCpandCpk?-DUSLLSLD)NominalMeanUSL-LSL6*sUSL-MeanMean-LSL3*s

Section4.UseoftheNMPDataCollectionSpreadsheet

ExampleofhowtoCollectData1. Runinandstabiliseprocess2. Notethemainparametersforreference3. Whentheprocessisstablerunthetoolfor10hours3. Take5partsoutfromeachcavityeveryhalfhourandmarkthemwithtime,dateandcavity.Total20setsof5partsfromeachcavitymustbemade,oraccordingtoagreement.4. Afterthelastsamplelotnotethemainprocessparametersforreference5. Measureandrecordthemainfunctionalcharacteristics(whitediamonds)6. FilldataintotheNMPdatacollectionspreadsheet7. Analyse!SeeDMY00019-ENClassificationandMarkingofFunctionalCharacteristicsTimeDimensionSubgroupsizen=5NumberofsubgroupsN=200,5hoursbetweensamplestakenNote:Forclarity,only6subgroupsareshown

DataCollectionSheet(DMM00024-EN-5.0)

DataCollectionSheet(DMM00024-EN-5.0)

GraphicalPresentation:HistogramWhatkindofdistribution?LocationversustoleranceareaWidth(deviation)E