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1、SPCTRAININGSPC统计制程控制StatisticalAnythingthatdealswiththecollection,analysis,interpretation&presentationofnumericaldataGaininginformationformakinginformeddecisionsProcessCombinationofmachines,tools,methods,materials&peopleemployedtoattainprocessspecificationAsimilarprocedure/eve
2、ntthatishappeningrepetitivelyControlTokeepsomethingwithinadesiredconditionMakesomethingbehavethewaywewantittobehaveTheuseofstatisticaltechniquessuchascontrolchartstoanalyzeaprocess,takeappropriateactionstoachieve&maintainastableprocess,&improveprocesscapability.1SPCTRAININGCla
3、ssificationsofcontrolchartsaredependingonthetypeofdataVariablesdataAcharacteristicmeasuredonacontinuousscaleresultinginanumericalvalueExamples:WirePull,BallShearStrength,Coplanarity,BallHeight,etc.AttributesdataAcharacteristicmeasuredby#ofconforming&non-conformingtoaspecificat
4、ion.Outputisclassifiedaspass/failoraccept/reject.E.g.BrokenWire,LiftedBond,FM,Chipping,BentLead,etc.Canbeexpressedintermsoffraction,percentage,countorDPMClassificationsofcontrolcharts2ControlChartConsistsofTwoPortions:XChartPlotsthemeanoftheXvaluesinthesampleShowsthechangesoft
5、hemeanofonesampletoanotherRChartPlotstherangeofasampleShowsthechangesindispersionorprocessvariabilityofonesampletoanother3ControlChartSymbolDescriptionSampleSizeX-RXMeanofSampleMustBeEqual(Mean-Range)ChartRRangeofSampleMustBeEqualX(IndividualChart)XIndividualMeasurementOneX-S(
6、Mean-StandardXMeanofSampleMustBeEqualDeviation)ChartSStandardDeviationofSampleMustBeEqualControlChartsForVariables4ControlChartsForAttributes5Whentousedifferentcontrolchart(Guidelinesonly)ControlChartWhentoUse(Guidelinesonly)?X-R-whensubgroupingofsamplesor(Mean-Range)Chartmeas
7、urementsisapplicable-n<10X-whensubgroupingisnotapplicable(Individual)duetosingleunitreadingmaytakeChartalongtime,unitreadingisextremelyexpensive,etc.-whenit'scommontohavesinglemeasurementspacedtimeapartX-S-whensubgroupingofsamplesor(Mean-StandardmeasurementsisapplicableDeviati
8、on)Chart-n>106SPCTRAINING按照CONTROLPLAN上规定,如WIREPULLTEST:Once/
