刚好及时化系统-JIT(ppt 41页).ppt

1/41,第十六章,剛好及時化系統Just-In-Time,2/41,章節概要,導論JIT的目標建立JIT架構轉換到JIT系統服務業的JITJIT採購JITII作業策略,只有在需要的時候才生產存貨會明顯減少一般是小批量生產是一種精簡生產系統leanproductionsystem,3/41,1.導論,剛好及時化系統:重複性的生產系統,其物料與貨品的加工dealingwithbreakdownsorproblemswhentheyoccurPreventivemaintenanceProactiveapproach;reducingbreakdownsthroughaprogramoflubrication,adjustment,cleaning,inspection,andreplacementofwornparts,34/41,ReasonsforkeepingequipmentrunningAvoidproductiondisruptionsNotaddtoproductioncostsMaintainhighqualityAvoidmisseddeliverydates,MaintenanceReasons,35/41,ProductioncapacityisreducedOrdersaredelayedNoproductionOverheadcontinuesCostperunitincreasesQualityissuesProductmaybedamagedSafetyissuesInjurytoemployeesInjurytocustomers,BreakdownConsequences,36/41,TotalMaintenanceCost,Breakdownandrepaircost,OptimumAmountofpreventivemaintenance,COST,TotalCost,Preventivemaintenancecost,Table16S-1,37/41,Preventivemaintenance:goalistoreducetheincidenceofbreakdownsorfailuresintheplantorequipmenttoavoidtheassociatedcostsPreventivemaintenanceisperiodicResultofplannedinspectionsAccordingtocalendarAfterpredeterminednumberofhours,PreventiveMaintenance,38/41,Frequencyofbreakdown/monthIftheaveragecostofabreakdownis$1,000,andthecostofpreventativemaintenanceis$1,250permonth,shouldusepreventivemaintenance?,ExampleS-1,39/41,Expectedcosttorepair=1.4breakdownspermonthX$1000=$1400Preventivemaintenance(PM)=$1250PMresultsinsavingsof$150permonth,ExampleS-1Solution,40/41,Maintenanceinterval,Averagetimebeforebreakdownisnormaldistributionwithmean3weeksandstandarddeviation0.6week.Ifbreakdowncostaverage$1000andpreventivemaintenancecost$250ANS:250/(250+1000)=0.2usingA