数控技术---外文翻译.doc
NUMERICALCONTROLNUMERICALCONTROLN/CISAFORMOFPROGRAMMABLEAUTOMATIONINWHICHTHEPROCESSINGEQUIPMENTISCONTROLLEDBYMEANSOFNUMBERS,LETTERS,ANDOTHERSYMBOLS.THENUMBERS,LETTERS,ANDSYMBOLSARECODEDINANAPPROPRIATEFORMATTODEFINEAPROGRAMOFINSTRUCTIONSFORAPARTICULARWORKPARTORJOB.WHENTHEJOBCHANGES,THEPROGRAMOFINSTRUCTIONSISCHANGED.THECAPABILITYTOCHANGETHEPROGRAMISWHATMAKESN/CSUITABLEFORLOWANDMEDIUMVOLUMEPRODUCTION.ITISMUCHEASIERTOWRITEPROGRAMSTHANTOMAKEMAJORALTERATIONSOFTHEPROCESSINGEQUIPMENT.THEREARETWOBASICTYPESOFNUMERICALLYCONTROLLEDMACHINETOOLSPOINTTOPOINTANDCONTINUOUSPATHALSOCALLEDCONTOURING.POINTTOPOINTMACHINESUSEUNSYNCHRONIZEDMOTORS,WITHTHERESULTTHATTHEPOSITIONOFTHEMACHININGHEADCANBEASSUREDONLYUPONCOMPLETIONOFAMOVEMENT,ORWHILEONLYONEMOTORISRUNNING.MACHINESOFTHISTYPEAREPRINCIPALLYUSEDFORSTRAIGHTLINECUTSORFORDRILLINGORBORING.THEN/CSYSTEMCONSISTSOFTHEFOLLOWINGCOMPONENTSDATAINPUT,THETAPEREADERWITHTHECONTROLUNIT,FEEDBACKDEVICES,ANDTHEMETALCUTTINGMACHINETOOLOROTHERTYPEOFN/CEQUIPMENT.DATAINPUT,ALSOCALL