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1、TimebetweenfailuresmodelandfailureanalysisofCNCsystemJournalofHarbinInstituteofTechnology(NewSeries),Vol.14,No.2,2007TimebetweenfailuresmodelandfailureanalysisofCNCsystemZHANGHai—bo,JL4Ya-zhou.,ZHOUGuang—wen.张海波,贾亚洲,周广文(I.Dept.ofMechanismandElectronics.NortheastChinaInstituteofE
2、lectricPowerEngineering,Jilin132012,China.E—mail:haibo—z@sohu.com;2.CollegeofMechanicalScienceandEngineering,JilinUniversity,Changehun130025.China)Abstract:ToprovidebasisforthereliabilityimprovementdesignofCNCsystem,thefailuredataofatypeofCNCsysteminoneyeararecollectedunderfield
3、conditionsinworkshops.Thedistributionmodelparametersoftimebetweenfailuresareestimatedbyleastsquaremethodandhypothesistestingisdonebyd—testmethod.ItjsprovedthatthetimebetweenfailuresoftheCNCsystemfollowsWeibulldistributionandthesystemhasenteredjntothewear—outfailureperiod.Thefail
4、urepositionsandfailurecausesareanalyzedfurthertoindicatetheweaksubsystemsoftheCNCsystem.Itcanbefoundthatservounit.electricalsystem,detectingunitandpow.ersupplyareprincipalfailurepositionsandthemainfailurecauseisbreakageofcomponents.111ecorrespond—ingimprovementmeasuresareputforw
5、ard.11hepaperprovidesareferencetoreliabilitydesignandanalysisofCNCsystemforthemanufacturerandhasgreatguidancetousingandmaintainingCNCsystemfortheuser.Keywords:CNCsystem;failureanalysis;reliability;WeibulldistributionCLCnumber:T(59.1Documentrode:AArticleID:10o5-9113(20o7)02-0197-
6、05ThereliabilityofCNCsystem,thecoreofCNCmachinetoo1.conce/Tlsthereliabilityofwholemachinetooldirectly.SomerelatedresearchhadbeendoneonthereliabilityofCNCmachinetool[J-4j,buttherearefewrelevantliteraturesaboutthefailurediscussionofCNCsystematpresent.Researchonthedistributionmodel
7、oftimebetweenfailuresandinvestigationtotheimportantreliabilityitern--meantimebetweenfailures(MTBF)willhavegreatguidancetoascertainthefail—ureoccurrenceruleofCNCsystem,confirmpreventa—tivemaintenancetimeandcarryoutreliabilityimprove—mentdesign.ApopulartypeofCNCsystem,whichisadopt
8、edinCNClathe,isinvestigatedinthispaper.Basedont
