工程能力(1)讲课讲稿.ppt

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1、工程能力(1)DefinitionMachineCapability:Variationcausedbythemachineandnotthevariationcausedbyotherpartsoftheprocess.ProcessCapability:Variationcausedbyallthesourcesofvariation-themachine,thematerialused,themethodsemployed,theoperators,involved,andtheenvir

2、onmentasitaffectstheproducts.DefinitionInclude:Changesinincomingshipmentsofmaterials,Shiftsintemperatures,Toolwear,Useofdifferentoperators,SmallchangesinmethodsWhenyouestimatetheprocesscapability,ObjectiveOldProcessesNewProcessesNewMaterialEvaluation

3、ProductSpecificationsProcessManagementProductDesignProblemSolvingUSES:DesignforPCSTerminology:SubgroupWindow⇒TimeBetweenSubgroups⇒Specimen⇒Sample⇒SampleSize⇒Thedurationofeach‘sampling’periodThedurationofeach‘nosampling’periodAnindividualunitofproduct

4、ThecollectionofSpecimensgatheredduringasubgroupwindowThenumberofspecimensinthesampleDesignforPCSHowtotakesample:SamplingNoSamplingSamplingNoSamplingTime“NoSampling”intervalsshouldbeofvaryinglength-randomlyDesignforPCSStandardDeviations:Sigma(σ)isused

5、torepresentstandarddeviationσs:Specimen–to-specimenstandarddeviationσw:Window–to-windowstandarddeviationσh:HistoricalstandarddeviationDesignforPCSProcessVariation:ThetotalamountofprocessVariation(σh)isacombinationofσsandσw.σh=√σ²s+σ²wPopulationandSam

6、plePopulation(母集團)Sample(標本)RemarkSizeMean(平均)Variance(分散)StandardDeviation(標準扁差)Nμσ²σnxs²sE(X)=μE(S²)=σ²PopulationandSampleObjectivePopulationSampleDataActiononaproductionprocess:ProcesscontrolProcessanalysisActiononalot:InspectionEstimationofqualit

7、yProcessLotSampleLotSampleDataDataSamplingActionMeasurementSamplingActionMeasurementHowtoperformaPCSDefiningtheObjectiveofthePCSExaminationofprocessstabilityLookingforaCPKvalueEstimationofthesteady-stateprocessvariationMaintainingcontrolchartsafterth

8、ePCS……?HowtoperformaPCS2.SettingOperatingConditionsTheconditionswillvaryfromstudytostudydependingontheobjectives.Machineadjustments?Operatingcrewschange?Rawmaterialslotchange?Linespeedchange?HowtoperformaPCS3.DesigningthePCSSubgroupwindowThedecisiono