【质量管理文档】SPCtraining

【质量管理文档】SPCtrainingSPCTRAININGSPC统计制程控制StatisticalAnythingthatdealswiththecollection,analysis,interpretation&presentationofnumericaldataGaininginformationformakinginformeddecisionsProcessCombinationofmachines,tools,methods,materials&peopleemployedtoattainprocessspecificationAsimilarprocedure/eventthatishappeningrepetitivelyControlTokeepsomethingwithinadesiredconditionMakesomethingbehavethewaywewantittobehaveTheuseofstatisticaltechniquessuchascontrolchartstoanalyzeaprocess,takeappropriateactionstoachieve&maintainastableprocess,&improveprocesscapability.2SPCTRAININGClassificationsofcontrolchartsaredependingonthetypeofdataVariablesdataAcharacteristicmeasuredonacontinuousscaleresultinginanumericalvalueExles:WirePull,BallShearStrength,Coplanarity,BallHeight,etc.AttributesdataAcharacteristicmeasuredby#ofconforming&non-conformingtoaspecification.Outputisclassifiedaspass/failoraccept/reject.E.g.BrokenWire,LiftedBond,FM,Chipping,BentLead,etc.Canbeexpressedintermsoffraction,percentage,countorDPMClassificationsofcontrolcharts3ControlChartConsistsofTwoPortions:XChartPlotsthemeanoftheXvaluesinthesleShowsthechangesofthemeanofonesletoanotherRChartPlotstherangeofasleShowsthechangesindispersionorprocessvariabilityofonesletoanother4ControlChartSymbolDescriptionSampleSizeX-RXMeanofSampleMustBeEqual(Mean-Range)ChartRRangeofSampleMustBeEqualX(IndividualChart)XIndividualMeasurementOneX-S(Mean-StandardXMeanofSampleMustBeEqualDeviation)ChartSStandardDeviationofSampleMustBeEqualControlChartsForVariables5ControlChartsForAttributes6Whentousedifferentcontrolchart(Guidelinesonly)

ControlChart

WhentoUse(Guidelinesonly)?

X-R

-whensubgroupingofsamplesor

(Mean-Range)Chart

measurementsisapplicable

-n<10

X

-whensubgroupingisnotapplicable

(Individual)

duetosingleunitreadingmaytake

Chart

alongtime,unitreadingisextremely

expensive,etc.

-whenit'scommontohavesingle

measurementspacedtimeapart

X-S

-whensubgroupingofsamplesor

(Mean-Standard

measurementsisapplicable

Deviation)Chart

-n>107SPCTRAINING

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8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)/KRCHART的中心线(CENTERLINE)

Rbar=(R1+R2+…Rk)/k

9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&PPK10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。114.SPC判断原则为哪些

UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)12有一点落在控制界限外；UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)13有连续的7点递增或递减UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)14有连续的7点位于中心线同侧UpperControlLimit(UCL)CenterLine(CL)LowerControlLimit(LCL)15有明显的非随机图形的出现；16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17通过QI监控OOC18WARNINGS:Group/Summarywillsortthenewtableinalphabeticalorderofthegroupingvariable.Controlchartsmustalwaysbeplottedintimeorder.Therefore,ifthesummarytableisnotintimeo