数控技术专业英语 教学课件 作者 黄义俊 电子教案统一模板(数控)Unit6.ppt

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1、Unit6PartProgrammingLesson11ManualPartProgramming6.1Lesson12ExampleofManualPartProgramming6.2ReadingMaterials11FormatofProgrammingLanguage6.3ReadingMaterials12TerminologyofProgrammingLanguage6.46.1Lesson11ManualPartProgrammingApartprogrammerisveryessentialinanyNCmanufa

2、cturingsystem.Aftergettingthepartdrawing,hedecidesthesequenceofoperations,thespeedsandfeedsforthevariousoperationsanddeterminesthemagnitudeofvariousmotionsdesired.Therefore,itisimportantthatheshouldbefamiliarwiththevariousoperationsandmachinetoolstobeusedandoughttocarr

3、youtcalculationsbasedongeometryandtrigonometry.Inmanualpartprogramming,themachininginstructionsarerecordedonadocument,calledapart-programmanuscript(Table6-1)bythepartprogrammer.Themanuscriptisessentiallyanorderedlistofprogramblocks．Becauseapartprogramrecordsasequenceof

4、toolmotionsandoperationstoproducethefinalpartgeometry,onemustprepareaprocessplanwithsetupsandfixturesbeforewritingtheprogram.Thework-piecelocationandorientation,features(holes,slots,pockets)tobemachined,toolsandcuttingparametersusedneedtobedetermined.Wewilluseanexample

5、toillustratehowapartisprogrammed.6.2Lesson12ExampleofManualPartProgrammingThepartdrawingshowninFigure6-1istobemachinedfroma5in.×4in.×2in.workpiece.Theworkpiecematerialislow-carbonsteel．Wewilluseahypothetical3-axisCNCmachiningcenterfortheprocess.Theprocessplanforthepart

6、isasfollows:Setthelower-leftbottomconerofthepartasthemachinezeropoint(floating-zeroprogramming).Clampthework-pieceinavise.Milltheslotwitha3/4in.four-fluteflatendmillmadeofcarbide.FromtheMachinabilityDateHandbook,therecommendedfeedis0.005in/tooth/randtherecommendedcu

7、ttingspeedis620fpm.Drilltwoholeswitha0.75in.diametertwistdrill．Use0.18iprfeedand100fpmspeed．Figure6-2showsthesetup，fixturing，andcutterpath.Alldimensionsininches.AlltoleranceA0.001inch.TheprogramfortheexamplepartisshowninTable6-2.6.3ReadingMaterials11FormatofProgrammi

8、ngLanguageAprogramformatisasystemofarranginginformationsothatitissuitableforinputtoaCNCcontroller.Severaldifferenttyp