电子教案统一模板(数控)Unit.ppt

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1、Unit5NCProgrammingLesson9BasicRequirementsofNCMachineControl5.1Lesson10InterpolationCommandsofCNCLathes5.2ReadingMaterials9SetupProcedure5.3ReadingMaterials10DebuggingtheProgram5.45.1Lesson9BasicRequirementsofNCMachineControlTocontrolamachine,itisnecessarytobeginbydefiningthecoor

2、dinateofthetoolmotion.Itisnecessarytospecifywhetherthemotionisapositioningmotion(rapidtraverse)orafeedmotion(cutting).Thefeedmotionincludeslinearmotionandcircularmotion.Thesecontrolfunctionsanddatarequirementsaresummarizedinwhatfollows:Preparatoryfunctions—thewordsspecifywhichun

3、it,whichinterpolator,absoluteorincrementalprogramming,whichcircularinterpolationplane,cuttercompensation,andsoon.Coordinates—definethreedimensional(andthreerotational)axes.Machiningparameters—specifyfeedandspeed.Toolcontrol—specifiestooldiameter,nexttoolnumber,toolchange,andso

4、on.Cyclefunctions—specifydrillcycle,reamcycle,borncycle,millcycle,andclearanceplane.Coolantcontrol—specifythecoolantcondition,thatis,coolanton/off,flood,andmist.Miscellaneouscontrol—specifiesallothercontrol,spindleon/off,spindlerotationdirection,palletchange,clampcontrol,andso

5、on.Interpolators—linear,circularinterpolation,circlecenter,andsoon.Thesecontrolfunctionsareprogrammedthroughprogramwords(codes).G-code—TheG-codeisalsocalledpreparatorycodeorword.ItisusedtopreparetheMCUforcontrolfunctions.Modalfunctionsarethosethatdonotchangeaftertheyhavebeenspe

6、cifiedonce,suchasunitselection.Non-modalfunctionsareactiveintheblockwheretheyarespecified．F-code—TheF-codespecifiesthefeedspeedofthetoolmotion.Itistherelativespeedbetweenthecuttingtoolandthework-piece.Feedspeedcanbechangedfrequentlyinaprogram,asneeded.WhenanF-codeispresentinablo

7、ck,ittakeseffectimmediately.S-code—TheS-codeisthecuttingspeedcode.Cuttingspeedisthespecificationoftherelativesurfacespeedofthecuttingedgewithrespecttothework-piece.Itistheresultofthetoolrotation.Therefore,itisprogrammedinrpm.TheMachineAbilityDataHandbookgivesthesevaluesinsurface

8、feetperminute(sfpm),andconversionisrequi