【质量管理精品文档】SPCtraining

InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20021SPCTRAININGSPC统计制程控制•Statistical–Anythingthatdealswiththecollection,analysis,interpretation&presentationofnumericaldata–Gaininginformationformakinginformeddecisions•Process–Combinationofmachines,tools,methods,materials&peopleemployedtoattainprocessspecification–Asimilarprocedure/eventthatishappeningrepetitively•Control–Tokeepsomethingwithinadesiredcondition–MakesomethingbehavethewaywewantittobehaveTheuseofstatisticaltechniquessuchascontrolchartstoanalyzeaprocess,takeappropriateactionstoachieve&maintainastableprocess,&improveprocesscapability.InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20022SPCTRAININGClassificationsofcontrolchartsaredependingonthetypeofdataVariablesdataAcharacteristicmeasuredonacontinuousscaleresultinginanumericalvalueExamples:WirePull,BallShearStrength,Coplanarity,BallHeight,etc.AttributesdataAcharacteristicmeasuredby#ofconforming&non-conformingtoaspecification.Outputisclassifiedaspass/failoraccept/reject.E.g.BrokenWire,LiftedBond,FM,Chipping,BentLead,etc.Canbeexpressedintermsoffraction,percentage,countorDPMClassificationsofcontrolchartsInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20023ControlChartConsistsofTwoPortions:XChart•PlotsthemeanoftheXvaluesinthesample•ShowsthechangesofthemeanofonesampletoanotherRChart•Plotstherangeofasample•ShowsthechangesindispersionorprocessvariabilityofonesampletoanotherInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20024ControlChartSymbolDescriptionSampleSizeX-RXMeanofSampleMustBeEqual(Mean-Range)ChartRRangeofSampleMustBeEqualX(IndividualChart)XIndividualMeasurementOneX-S(Mean-StandardXMeanofSampleMustBeEqualDeviation)ChartSStandardDeviationofSampleMustBeEqualControlChartsForVariablesInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20025ControlChartSymbolDescriptionpChartp%Defectivenpchartnp#defectiveControlChartsForAttributesInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20026Whentousedifferentcontrolchart(Guidelinesonly)ControlChartWhentoUse(Guidelinesonly)?X-R-whensubgroupingofsamplesor(Mean-Range)Chartmeasurementsisapplicable-n10X-whensubgroupingisnotapplicable(Individual)duetosingleunitreadingmaytakeChartalongtime,unitreadingisextremelyexpensive,etc.-whenit'scommontohavesinglemeasurementspacedtimeapartX-S-whensubgroupingofsamplesor(Mean-StandardmeasurementsisapplicableDeviation)Chart-n10InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20027SPCTRAINING•按照CONTROLPLAN上规定,如WIREPULLTEST:Once/shift,andafterdevicechange,capillarychange,andaftermachinerepair;10WIRES/UNIT.XBar&RCHART.何时/如何收集数据InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20028如何计算平均值,极差•XBAR&RCHART参数计算对于k组样本,每组抽样量均为n的数据•Xi=(X1+X2+….Xn)/n(i=1~k)•Ri=Xmax-Xmin(i=1~k)•XBARCHART的中心线(CENTERLINE)Xbarbar=(Xbar1+Xbar2+…Xbark)/K•RCHART的中心线(CENTERLINE)Rbar=(R1+R2+…Rk)/kInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/20029•对于XBARCHART的控制线•UCL/LCL=Xbarbar+/-3sigma•对于RCHART的控制线•UCL/LCL=Rbar+/-3sigma•*进行控制线计算时，至少已收集了25组数据。•Ppk=(USL-Xbarbar)/3SorPpk=(USL-Xbarbar)/3S取较小者XBAR&RCHART的控制线&PPKInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200210如何绘制在XBAR-R图表按收集的X，R的数据，计算每组的Xi和Ri，根据控制线确定在XBAR-RCHART图上的位置，点上点，然后连线。InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/2002114.SPC判断原则为哪些UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200212有一点落在控制界限外；UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200213有连续的7点递增或递减UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200214有连续的7点位于中心线同侧UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200215有明显的非随机图形的出现；InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200216发生OOC时,如何处理停止处于失控状态的机器的生产按照OCAP的指示进行相应的处理重新测数据，直到新的数据得到控制，才能继续生产InternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200217通过QI监控OOCInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200218WARNINGS:Group/Summarywillsortthenewtableinalphabeticalorderofthegroupingvariable.Controlchartsmustalwaysbeplottedintimeorder.Therefore,ifthesummarytableisnotintimeorder,youwillhavetosortthetableincorrecttimeorderbeforemakingthecontrolchart.LCL(R)=0ExampleofComputingControlLimitsforX-RChartusingJMPInternalUseOnlyPrepareBy:VickyWangDate:06/Aug/200219记录有关OOC信息记录在表单QCM-AOR07上。