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时间:2020-03-08
《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》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
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.AlltoleranceA0.001inch.TheprogramfortheexamplepartisshowninTable6-2.6.3ReadingMaterials11FormatofProgrammi
8、ngLanguageAprogramformatisasystemofarranginginformationsothatitissuitableforinputtoaCNCcontroller.Severaldifferenttyp
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