中英文翻译--NUMERICAL CONTROL数控技术.doc

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1、追莽感鬯尧糨砌塔圣苏庑份NUMERICALCONTROL揪贤扳峡蓉为瀑唤拉龀竿颊Numericalcontrol(N／C)isaformofprogrammableautomationinwhichtheprocessingequipmentiscontrolledbymeansofnumbers，letters，andothersymbols．Thenumbers，letters，andsymbolsarecodedinanappropriateformattodefineaprogramofinstructionsforapa

2、rticularworkpartorjob．Whenthejobchanges，theprogramofinstructionsischanged．ThecapabilitytochangetheprogramiswhatmakesN／Csuitableforlow-andmedium-volumeproduction．Itismucheasiertowriteprogramsthantomakemajoralterationsoftheprocessingequipment．惝伙嫘缢逡西萧诅彤鸺渴挂Therearetwobasi

3、ctypesofnumericallycontrolledmachinetools：point—to—pointandcontinuous—path(alsocalledcontouring)．Point—to—pointmachinesuseunsynchronizedmotors，withtheresultthatthepositionofthemachiningheadCanbeassuredonlyuponcompletionofamovement，orwhileonlyonemotorisrunning．Machines

4、ofthistypeareprincipallyusedforstraight—linecutsorfordrillingorboring．侏粉倔盾泱剞揖墅栏鸥嫡礁TheN／Csystemconsistsofthefollowingcomponents：datainput，thetapereaderwiththecontrolunit，feedbackdevices，andthemetal—cuttingmachinetoolorothertypeofN／Cequipment．鞠肢俺纽侵蜊林鞣峡幽攵邝Datainput，alsoc

5、alled“man—to—controllink”，maybeprovidedtothemachinetoolmanually，orentirelybyautomaticmeans．Manualmethodswhenusedasthesolesourceofinputdataarerestrictedtoarelativelysmallnumberofinputs．Examplesofmanuallyoperateddevicesarekeyboarddials，pushbuttons，switches，orthumbwheels

6、electors．Thesearelocatedonaconsolenearthemachine．Dialsaleanalogdevicesusuallyconnectedtoasyn-chro-typeresolverorpotentiometer．Inmostcases，pushbuttons，switches，andothersimilartypesofselectorsayedigitalinputdevices．Manualinputrequiresthattheoperatorsetthecontrolsforeach

7、operation．Itisaslowandtediousprocessandisseldomjustifiedexceptinelementarymachiningapplicationsorinspecialcases．妹卵酶埘芍嘶貌负勰箨鳜丞Inpracticallyallcases，informationisautomaticallysuppliedtothecontrolunitandthemachinetoolbycards，punchedtapes，orbymagnetictape．Eight—channelpunc

8、hedpapertapeisthemostcommonlyusedformofdatainputforconventionalN／Csystems．Thecodedinstructionsonthetapeconsistofsectionsofpu