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1、Computer-AidedProcessPlanningAccordingtotheTool&ManufacturingEngineersHandbook,processplanningisthesystematicdeterminationofthemethodsbywhichaproductistobemanufacturedeconomicallyandcompetitively.Itessentiallyinvolvesselection,calculation,anddocumentation.Processes,machines,tools,operations,andseq
2、uencesmustbeselected.Suchfactorsasfeeds,speeds,tolerances,dimensions,andcostsmustbecalculated.Finally,documentsintheformofsetupinstructions,workinstructions,illustratedprocesssheets,androutingsmustbeprepared.Processplanningisanintermediatestagebetweendesigningandmanufacturingtheproduct.Buthowwelld
3、oesitbridgedesignand-manufacturing?Mostmanufacturingengineerswouldagreethat,iftendifferentplannerswereaskedtodevelopaprocessplanforthesamepart,theywouldprobablycomeupwithtendifferentplans.Obviously,alltheseplanscannotreflectthemostefficientmanufacturingmethods,and,infact,thereisnoguaranteethatanyo
4、neofthemwillconstitutetheoptimummethodformanufacturingthepart.Whatmaybeevenmoredisturbingisthataprocessplandevelopedforapartduringacurrentmanufacturingprogrammanybequitdifferentfromtheplandevelopedforaparduringacurrentmanufacturingprogrammaybequitedifferentfromtheplandevelopedforthesameorsimilarpa
5、rtduringapreviousmanufacturingprogramanditmanyneverbeusedagainforthesameorsimilarpart,Thatrepresentsalotofwastedeffortandproducesagreatmanyinconsistenciesinrouting,tooling,laborrequirements,costing,andpossiblyevenpurchaserequirements.Ofcourse,processplansshouldnotnecessarilyremainstatic.Aslotsizes
6、changeandnewtechnology,equipment,andprocessesbecomeavailable,themosteffectivewaytomanufactureraparticularpartalsochanges,andthosechangesshouldbereflectedincurrentprocessplansreleasedtotheshop.Aplannermustmanageandretrieveagreatdealofandmanydocuments,includingestablishedstandard,machinabilitydata,m
7、achinespecifications,toolinginventories,stockavailability,andexistingprocessplans.Thisisprimarilyaninformation-handlingjob,andthecomputerisanidealcompantion.Thereisanotheradvantagetousingcomputerstohelpwithproces
