Reliability Data Collection and Database Establishment of CNC Lathe
1Introduction CNCmachinetoolsarethebasicequipmentofmodernmanufacturingtechnology,andtheirtechnicallevelisanimportantindicatorofthelevelofindustrialmodernizationinacountry.ThereliabilityofCNCmachinetoolsisthekeytothequalityofmachinetools.Atpresent,thereliabilityofdomesticCNCmachinetoolsisobviouslylowerthanthatofforeigncountries,whichseriouslyaffectsthecompetitivenessofdomesticCNCmachinetools.ImprovingthereliabilityofdomesticCNCmachinetoolshasbecomeatoppriority. Reliabilityanalysisisbasedonalargeamountoffielddata.Withthehelpofplannedandpurposefulcollectionofdataateachstageoftheproductlifecycle,analysisisperformedtofindtheweaklinksofproductreliability,improvethedesign,andimproveproductquality,soitisreliableThecollectionandanalysisofperformancedataplayanimportantroleinreliabilityengineering.However,thisaspectisaweaklinkindomesticreliabilityresearch.DuringtheperiodfromJuly1,1996toDecember31,1996,wecollectedthereliabilitydataof42CNClathesfromtheChangchunGearFactoryofFAWGroup,andinitiallyestablishedthereliabilitydatabaseofCNClathes.TakethisasanexampletoillustratethemethodofcollectingreliabilitydataofCNCmachinetoolsandthemethodofestablishingdatabase. 2Determinationofreliabilitytestplan Reliabilitytestisoneofthemainmethodstoobtainreliabilitydata,anditisthebasisforreliabilitydesignandanalysis.Inthepast30years,reliabilitytestmethodshavemadegreatprogress.Reliabilitytestingistime-consumingandexpensive.ForCNClathes,themainconsiderationisthetestsiteandtestsamples. Accordingtothetestsite,thereliabilitytestisdividedintofieldtestandlaboratorytest.DuetothecomplexstructureofCNClathes,therearemanyuncertainfactorsintheconditionsofuse,sotheactualreliabilitycanbecollectedbyselectingthefieldtestmethod.Datareliabilityisakeyissueinfieldtests.Acompletecollectionplanmustbeformulatedinadvance,andthedatashouldbeprocessedafterwardstoeliminateunreasonablefactors. Reliabilitytestscanbedividedintotwotypes:fulltestandsamplingtestaccordingtosamplesize.ItisimpossibletocarryoutalltestsforbatchproductssuchasCNClathes,andonlythetestmethodofsamplingandtimingtruncationcanbeused.Inordertomakethecollecteddatarepresentativeandconvenientfordatacollection,whenselectingtestsamples,asmanyCNClathesaspossibleshouldbeselectedassamplingsamples,andtheselectedequipmentshouldberelativelyconcentrated.Therefore,thisarticlechosetheFAWGroupChangchunGearFactory,whichusesalargeamountofCNClathesandhasrelativelyconcentratedequipment,asthetestbase,andtookits42CNClathesassamplesforahalf-yearfollow-upinvestigation.
