Short term Capability study

Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCapabilitystudyTrainingSPCAutomotivePassionCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionDefinitionsCmcapabilitymachineShortterm:CapabilityoftheprocessCpdispersion:Don’ttakecareoftheaimedvalueneedCpkCpkGivethepercentoutoftoleranceLongterm:PerformanceoftheprocessPpdispersion:Don’ttakecareoftheaimedvalueneedPpkPpkGivethepercentoutoftoleranceCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionWhy?2ObjectivesToprovetothecustomerthatweareabletosupplyhimpartswhichrespectthespecifiedtoleranceintervalsANDthatourmachinearenotirregular(wedon’tneedtoworkonthemalthetime)soourprocessisstableTodefineourcontrolchartsTocorrectourprocessCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionControlchartsQuestions:Whyourcontrolchartsarelikethat?Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionControlchartsTheanswersWhythoseresults?TheaimThenormalprocessvariabilityThecustomertoleranceReactionneeded:theprocessisunstableOUTOFTOLERANCECopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionHowCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionHowThisiswhatwecandonowCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionSamplingrulesSamplingrulescommontoallcoefficients:Samplinginvolvesatleast30measurementsdividedinto6samplesof5partsThesampleshavethesamesize;Frequencyofsamplingisdefinedandsavedonthecalculationsheet(neededforfrequencycontrol)Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionWhattodoifbadresults.ALLTHETIMEAPROBLEMCOMESOUT:WORKWITHTHEINDUSTRIALIZATION/METHODS/PRODUCTIONIfnormalityproblem:Possibilities:Expectednon-normality:Position/Formsousetheadaptedcaculationmethod(AQGR65)Unexpectednon-normality:Determinewhy(maybeyoumixeddifferentpopulation,theaimedvaluechangedduringtheproduction,soon...)CorrecttheproblemMakeessaysagainCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassion1.Measurementcontrol•Specialcasefortheshapedefault•Specialcaseofparellelism2.Attributecontrol2MaindifferentkindsoftestCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCaseofthemeasurementcontrolTocalculatetheCp/CpkusethedocAQGR64CaseofthemeasurementcontrolFillthedateofsamplingFillyourmeasuresof6samplesof5partshereFillthisparttotalyexceptPpPpk;Cp=1,67Cpk=1,33123Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCaseofthemeasurementcontrol132Ifthoseruleshavebeenrespectedthenclickok(2)Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCaseofthemeasurementcontrolGreen=ok;Red=Notok.IfnotOKyoucanStopnow,takenoteoftheproblemGotofindsolutionwththeindus/methodAftermodificationsandnewessayswehavethoseresultsIfthismessageappearverifywhatiswrittenonitandfollowtheinstructionsCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCaseofthemeasurementcontrolGreen=ok;Red=Notok.IfnotOKyoucanStopnow,takenoteoftheproblemGotofindsolutionwththeindus/methodAftermodificationsandnewessayswehavethoseresultsCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionMakingthecontrolchart(GoonControlchartsheet)CaseofthemeasurementcontrolFillthefrequency123Hereyoucanreadyournominalandlimits.Enterthosevalueonyourcontrolchart!(Nextstepwllbetoupgradethoselimisbyoptimizingtheprocessbutfornowit’senough)Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionSavetheresults:goon“calculation”sheetclickonMENUCaseofthemeasurementcontrolCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCaseoftheshapedefaultTocalculatetheCm(equivalenttoCp/Cpk;hereCp/CpkisequivalenttoPpPpk…)usethedocAQGR64Caseofthemeasurementcontrol/ShapedefaultFillthedateofsamplingFillyourmeasuresof6samplesof5partshereFillthisparttotalyexceptCp,Cpk;Cm=1,67123Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionCaseofthemeasurementcontrol/ShaedefaultGreen=ok;Red=Notok.IfnotOKyoucanStopnow,takenoteoftheproblemGotofindsolutionwththeindus/methodIfproblemwithCm,evenifit’swrittenthatthisisashapedefault,Mostofthetimeitwasn’t…Ithikit’saproblemwiththefilebecausewhenyoucalculatetheCp/Cpkittelsyouthatit’qsnot-SocalculatetheCp/Cpkitwilltellsyou.Ifit’snot-gobackwiththenormallawtest,Ifthenormallawisnotokthereisprobablyareasonyouhavetofind.Confirmation:thisisashapedefaultCopyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionMakingthecontrolchart(GoonControlchartsheet)Caseofthemeasurementcontrol/ShapedefectFillthefrequency123Hereyoucanreadyournominalandlimits.Enterthosevalueonyourcontrolchart!(Nextstepwllbetoupgradethoselimisbyoptimizingtheprocessbutfornowit’senough)Copyright©2008Allevard-RejnaAutosuspensions/AllRightsreservedAutomotivePassionSavetheresults:goon“calculation”sheetclickonMENUCaseoftheme