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1、13StatisticalProcessControlandQualityControlOverviewsionalmeasurementsoftheprecisionneededforSPCaregenerallydoneoffline.ObtainingStatisticsisabranchofmathematicsdeal-thefinaldimensionalstabilityneededtomea-ingwiththecollection,analysis,interpreta-sureapartmaytaketime.Forexample,amor
2、-tion,andpresentationofmassesofnumericalphousinjectionmoldedplasticpartsusuallydata.Thewordstatisticshastwogenerallyac-requireatleastahalfhourtostabilize.ceptedmeanings:(1)acollectionofquantita-TheSPCsystemstartswiththepremisetiveanalysisdata(datacollection)pertainingthatthespecific
3、ationsforaproductcanbetoanysubjectorgroup,especiallywhenthedefinedintermsoftheproduct’s(customer’s)dataaresystematicallygatheredandcollated,requirementsorthataproductisorhasbeenand(2)thesciencethatdealswiththecollec-producedthatwillsatisfythoseneeds.Gen-tion,tabulation,analysis,inte
4、rpretation,anderallyacomputercommunicateswithaseriespresentationofquantitativedata.ofprocesssensorsand/orcontrollersthatop-Statisticalprocesscontrol(SPC)isanim-erateinindividualdataloops(Chap.7).Theportantreal-timeonlinemethodbywhichcomputersendssetpoints(builtonwhichaproductionproc
5、esscanbemonitoredandperformancecharacteristicsoftheproductcontrolplanscanbeinitiatedtokeepqualityaredesired)totheprocesscontroller,whichstandardswithinacceptablelimits.Statisticalconstantlyfeedsbacktothecomputertosig-qualitycontrol(SQC)providesofflineanal-nalwhetherornotthesetofpoin
6、tsareinfactysisofthebigpicture,suchaswhatwasthemaintained.Thesystemsareprogrammedimpactofpreviousimprovements.Itisimpor-toactwhenkeyvariablesaffectingproducttanttounderstandhowSPCoperates.qualitydeviatebeyondsetlimits(1,13,559,Therearetwopossibleapproachesforreal-596).timeSPC.Thefir
7、st,doneonline,involvestherapiddimensionalmeasurementofaspecificproductcharacteristicoranondimensionalCombiningOnlineSPCandOfJlineSQCbulkparametersuchasweightwhichisoftenthemorepracticalmethod.Inthesecondap-OnlineSPCsoftwareexcelsatmonitoringproach,incontrasttoweight,otherdimen-produ
8、ctionprocessesinrea
