6σ_concept

Understanding6σ(SixSigma)LGElectronics/PCDiv.QAGroupLGEInternalOnlys61/16LGEConfidentialContentsⅠ.Whatis6σactivity?1.Whatarethestatistics?2.SolutionofthePracticalProblem3.Whatisthe6σconcept?4.6σApplication5.6σActivityProcess6.Comparewithothertools7.6σPhilosophyⅡ.Whyshouldwedo6σ?▶Quality&FailureRateⅢ.HowtoLaunch6σ?▶KeyFactorforSuccessof6σ?Ⅳ.WhatisRolledThroughputYield?s62/16LGEConfidential1.Whatarethestatistics?◆Population&SampleSamplePopulationN＝1,000Measure10samples(Spec.:100±4)○Youmaysay“ThisPopulationisGoodbecauseallthesample’sdataarelocatedbetweenLSL&USL.BUT,Ifyouestimatethedefectrateusingstatisticalanalysis,thispopulationhastheprobabilityof2.8%defectsperunit.Thenthisis-wecall-“Anepidemic”qualitydefectlevel.○Measuringdefectrateonprocessthroughanexpandingstatisticalconcept,wecanusemeasuringprocesscapability.ⅩⅩⅩⅩⅩⅩⅩⅩⅩⅩUSL(UpperSpecLimit)LSL(LowerSpecLimit)Ⅰ.Whatis6σactivity?96979899100104101102103Totalinspectionisimpossible!Statisticalvariables(mean,variance)estimatepopulations63/16LGEConfidentialμUSLUSLTμUSLUSLTUSLUSLTμPrecisebutnotAccurateAccuratebutnotPreciseShiftingtoTarget&ReducingVariationShifttoTargetReducingVariation2.SolutionofthePracticalProblemⅠ.Whatis6σactivity?Objectof6σisShifttoTargetReducingvariations64/16LGEConfidential6σQualitymeansthatareaoftheestimatednormaldistributionislocatedbetweenUSL&LSLwith±6σ.Inthatcaseareaoftheoutlierspec.(Inotherwordsestimateddefects)isjust3.4PPM.*σ:StandardDeviationStatisticindexmeasureshowmuchdataapartfromtargetvalue3.4ppmTargetUSLLSL+6σ-6σσ+3σ-3σσ6.68%3.whatisthe6σconcept?Ⅰ.Whatis6σactivity?StatisticalDefinitionof6σ3σ6σs65/16LGEConfidential63.4523346,210366,8072308,537σPPM•1misspelledwordinallofthebookscontainedinasmalllibrary•$340indebtednessper$100millionsassets•1.8minutesperyear•1.5misspelledwordsperpageinabook•$6.7millionsindebtednessper$100millionsassets•24daysperyearⅠ.Whatis6σactivity?6σastheBusinessStrategy3.whatisthe6σconcept?s66/16LGEConfidential•InallDesign,Manufacturing,andSVCprocesses•Applyingfor6σstatisticTools&Processes•Tofindfactorscausingdefects•ActingtheAnalysisandImprovement•ThroughtheDefectReduction,IncreaseYield&TotalCustomerSatisfaction•ManagementInnovationToolcontributestoManagementOutputAchieving3.4PPM(3.4DefectsPerMillion)Whatis6σactivity?PPM:PartsperMillionⅠ.Whatis6σactivity?6σastheActivity3.whatisthe6σconcept?s67/16LGEConfidential4.6σApplication•SelectingCTQtomeetcustomerneeds•DecisionreasonableTolerance•GuaranteeoftheCTQ’scapabilityanalysis•ImprovementseriousproblemusingS/W•RealTimeMonitoringsystem→CTQControlsystem•Improvementcycletimeandaccuracy•CostImprovementGuaranteefortheDesigncompletionindevelopingstageQualityassuranceinmanufacturingstageMaximizingforsales&SVC6σisatoolthatappliestoallbusinesssystems-Design,Manufacturing,SalesandSVCⅠ.Whatis6σactivity?R&D6σManufacturing6σDe-signSales&SVCMfg.6σTransaction6σDesignMfg.Sales&SVCs68/16LGEConfidentialIdentifyCustomer-DrivenCTQ(CriticaltoQuality)CharacteristicsIdentifyKeyProcessesthatcauseDefectsinaCTQCharacteristicsForEachProductorProcessCTQMeasure,Analyze,Improve,&Control6σisarigorousanalyticalprocessforsolvingproblem!!!5.6σActivityProcessⅠ.Whatis6σactivity?1.Whoareyourcustomers?-Internal/External2.Whatdoyouprovideyourcustomers?3.Whatiscriticaltoqualityforyourcustomers?1.WhatareyourinternalprocessesforprovidingyourproductorserviceCTQ’stoyourcustomers?2.Wheredodefectsoccurintheseprocesses?D•PracticalProblem•MeasurementSystem•YieldCalculation•ProcessMapping•σCalculation•Benchmarking•ParetoChart&Stratification•Cause&EffectDiagram•DOE•Brainstorming•ActionWorkoutTechniques•Piloting•ControlMechanism•ControlChart•ProceduresMAIC6σActivityProcess(manufacturing&Transaction)****CTQ(CriticalToQuality):Yourcustomersfeelthatcharacteristicofproduct,serviceorprocessiscritical.**D:Defines69/16LGEConfidentialExampleofdevelopmentprocessappliedbyR&D6σR&D6σKick-OffEvaluationmeetingforpresentconditionEvaluationmeetingforbasicconceptEvaluationmeetingforplanningconfirmE/SdrawingconfirmCusto-merNeedsSurveyQFDS-1SpareCTQSelec-tionSimilarprocessDatagatheringZValueofCTQAnalysisMeetingforCTQCheckZValueoptimize,DesignimproveQFDS-2DesignFMEAProcessFMEADevelopmentProcessE/SmakingDevelopmentdrawingconfirmIncomePartsE/SQualitymeetingP/LMakingP/LQualityMeetingIncomepartsP.PMakingP.PQualitymeetingCTQDatafornewpartsgatheringActivityforprocessimprove-mentCTQfornewpartsConfirmCTQdeci-sionZValueofCTQconfirm5.6σActivityProcessⅠ.Whatis6σactivity?s610/16LGEConfidential-Define/Measurement-VarianceofCTQ-Presentcon-ditionAnalysis-Improvedbyexpert’sIdea-Controledbycontrolchart-Process4McontrolMeasure-Symptoms-Frequency-Analysisforstatistics-Effectanalysiscausedfactors-OptimizingconditionbystatisticalanalysisOthers6σ-DiscreteData-Difficulttoapplypracticalproblembecauseofcomplexity-Discrete+Continuousdata-Easytoapplybecauseofsupportingstatisticalsoftware.AnalysisImprovementControl-ControledbyPTS(CTQ,Benefits)•Focusingexperience/technology*PTS:ProjectTrackingSystem*ByImprovementProcessⅠ.Whatis6σactivity?6.Comparewithothertoolss611/