文档介绍：SPCPartII:SamplingPlansforX-chartLearningObjectivesRevisionofSPCFundamentals/SPC原理校正MisconceptionsofSPC/SPC误解ProcessControlModel/ausesofVariability/2种基本变异原因ReviewofX-RChartandX-sChart/均值极差及单值控制图回顾ReviewofAttributesControlCharts属性控制图回顾DesigningtheX-chart均值控制图的设计SamplingRisks(aandb)抽样风险ARL0andARL1DeterminingSamplingInterval决定抽样时间间隔DeterminingSampleSize决定样本大小MisconceptionsofSPCLet’moncontrolchart,X-,检阅我们对SPC的了解LSLUSLPuttingUSL&LSLonX-&LSLdownto,say,70%or80%,-,:-?-Gutfeel?-Passed-downfigures?-Statisticalcalculation?-Technicaljudgement?5pcs/=?sx,sx,swithin,soverall??ponents&Sub-Assemblies原材料,零件及半成品ProcessProductObservation观察: DataCollection数据收集Evaluation评估: DataAnalysis数据分析Diagnosis诊断: FaultDiscovery错误发现Decision决策: FormulateAction阐明行动Implementation推行: TakeAction采取行动UncontrollableInputs不可控的输入ControllableInputs可控的输入StatisticalProcessControlTheprocesscontrolmodelshiftsfocustothehomefront, ,takingapreventive ,如,制造制程,是采取预防措施而非直接解决问题Italsohassomethingwhichtheoldconceptofproduct controllacked- -Statistical ProcessControl(SPC).新的产品控制观念强调了SPCWeowetheapplicationofstatisticsasatoolfor