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编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第PAGE9页共NUMPAGES9页第PAGE\*MERGEFORMAT9页共NUMPAGES\*MERGEFORMAT9页HYPERLINK""FromPeterSmid,CNCProgrammingHandbook:AComprehensiveGuidetoPracticalCNCProgramming,SecondEdition,IndustrialPress,Inc.200MadisonAvenue,NewYork,2003.CHAPTER6:PROGRAMMINGPLANNINGThedevelopmentofanyCNCprogrambeginswithaverycarefullyplannedprocess.Suchaprocessstartswiththeengineeringdrawingoftherequiredpart.Beforethepartismachined,severalstepshavetoconsideredandcarefullyevaluated.Themoreeffortisputintotheplanningstageoftheprogram,thebetterresultsmaybeexpectedattheend.STEPSINPROGRAMPLANNINGThestepsrequiredinprogramplanningaredecidedbythenatureofthework.Thereisnoformulaforallthejobs,butsomebasicstepsshouldbeconsidered:*Initialinformation/Machinetoolsfeatures*Partcomplexity*Manualprogramming/computerizedprogramming*Typicalprogrammingprocedure*Partdrawing/Engineeringdata*Methodssheet/Materialsspecifications*Machiningsequence*Toolingselection*Partsetup*Technologicaldecisions*Worksketchandcalculations*QualityconsiderationsinCNCprogrammingThestepsinthelistaresuggestionsonlyaguideline.Theyarequiteflexibleandshouldalwaysbeadaptedforeachjobandtothespecificconditionsofthework.INITIALINFORMATIONMostdrawingsdefineonlytheshapeandsizeofthecompletedpartandnormallydonotspecifydataabouttheinitialblankmaterial.Forprogramming,agoodknowledgeofthematerialisanessentialstart-mainlyintermsofitssize,type,shape,condition,hardness,etc.Thedrawingandmaterialdataaretheprimaryinformationaboutthepart.Atthispoint,CNCprogramcanbeplanned.Theobjectiveofsuchaplanistousetheinitialinformationandestablishthemostefficientmethodofmachining,withallrelatedconsideration–mainlypartaccuracy,productivity,safetyandconvenience.Theinitialpartinformationisnotlimitedtothedrawingandthematerialdata,italsoincludesconditionsnotcoveredinthedrawing,suchaspro-andpost-machining,grindingallowances,assemblyfeatures,requirementsforhardening,nextmachinesetup,andothers.Collectingallth
