质量管理七大手法--wurooney.ppt

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1、QC7ToolsWhatis7tools?ChecksheetLeveldiagramHistogramParetodiagramCause-and-effectdiagramScatterdiagramControlchartImportanceof7toolsWhy“MADEINJAPAN”---Automobile,electronic,chemical,exactitudeequipment,etc.Theconcept“QC7tools”israisedbyKaoruIshikawa.“QC7tools”

2、playedanimportantpartinJapan’seconomicrecoveryanddevelopment.QC7Tools---CheckSheetWhatischecksheet?Atablewhichlistsoutallitemsneedchecking.Checksheetincludes,butnotlimitedto:diagnoses,questionnaire,record,statistics,etc.CheckSheet---KeypointsKeypoints:1.Verify

3、theitemstocheck;2.Verifythefrequencytocheck;3.Verifythepersonneltocheck.Implementprocedure1.Verifytheobject;2.Framethechecksheet;3.Checkandrecord;4.RequestaimprovementaimingattheNCitems5.Verifytheimprovement6.Summarizeperiodicallyandimprovepersistently.LevelDi

4、agramWhatisleveldiagram?Sortallopinions,viewsorthoughtsbyspecifictopicandgroupthecollecteddataorinformation.Implementprocedure1.Identifythetopictostudy;2.Frametheleveldiagramandcollectdata;3.Sortthedatatovariouslevels;4.Analyzethedata.QC7Tools---HistogramWhati

5、shistogram?Ahistogramisasimplefrequencydistribution.Itisaplotoftheactualdatashowingthedatavaluesversusthenumberofoccurrencesforeachvalue.JudgetheProcessCapability(Cp)fromthehistogramCpisjustOKCpisbetterthanspecCpisleantoleftCpisleantorightTooscatteredCpImpleme

6、ntProcedure1.Collectdata;Forexample:GeardimensionproducedbyABCfactoryasbelow;specificationofthisgearis24.5±6mm:1234567891022.123.422.627.722.923.724.521.324.721.225.824.523.221.321.624.124.817.421.920.323.924.624.322.724.626.730.026.023.124.622.821.822.624.025

7、.122.419.323.923.621.525.023.624.924.826.423.926.618.323.225.321.725.023.521.724.327.229.025.023.822.322.228.024.621.625.224.826.727.628.525.824.625.322.527.525.524.824.623.818.819.925.124.822.626.624.125.023.420.621.326.322.924.421.523.123.428.922.420.126.226

8、.4ImplementProcedure2.Counttherange:R=Xmax–Xmin=30.0-17.4=12.63.Setthegroup:Totaldata50-100100-250>250Groups6-107-1210-20Weset10groupsinthisexample.Implementprocedure4.Verifythemin