资源描述：
《数字控制毕业论文外文文献翻译及原文》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。
1、毕业设计（论文）外文文献翻译文献、资料中文题目：数字控制文献、资料英文题目：文献、资料来源：2017.02.14文献、资料发表（出版）曰期院（部）专业班级姓名学a指导教师翻译曰期NUMERICALCONTROLLibraryofCtheCNCindustrialandeducationalfield,hehasdevelopedtensofthousandsNumericalControltechnologyasitisknowntoday,emergedinthemid20thcentury.Itcanbetracedtothe
2、yearof1952,theILS.AirForce,andthenamesofJohnParsonsandtheMassachusettsInstituteofTechnologyinCam-bridge,MA,USA.Itwasnotappliedinproductionmanu-facturinguntiltheearly1960’s.TherealboomcameintheformofCNC,aroundtheyearof1972,andadecadelaterwiththeintroductionofaffordable
3、microcomputers.Thehistoryanddevelopmentofthisfascinatingtechnologyhasbeenwelldocumentedinmanypublications.Inthemanufacturingfield,andparticularlyintheareaofmetalworking,NumericalControltechnologyhascausedsomethingofarevolution.Eveninthedaysbeforecomput-ersbecamestanda
4、rdfixturesineverycompanyandinmanyhomes,themachinetoolsequippedwithNumericalControlsystemfoundtheirspecialplaceinthemachineshops.Therecentevolutionofmicroelectronicsandtheneverceasingcomputerdevelopment,includingitsimpactonNumericalControl,hasbroughtsignificantchangest
5、othemanufacturingsectoringeneralandmetalworkingin~dustryinparticular.DEFINITIONOFNUMERICALCONTROLInvariouspublicationsandarticles,manydescriptionshavebeenusedduringtheyears,todefinewhatNumericalControlis.Itwouldbepointlesstotrytofindyetanotherdefinition,justforthepurp
6、oseofthishandbook.Manyofthesedefinitionssharethesameidea,samebasicconcept,justusedifferentwording.Themajorityofalltheknowndefinitionscanbesummedupintoarelativelysimplestatement:NumericalControlcanbedefinedasanoperationofmachinetoolsbythemeansofspecificallycodedinstruc
7、tionstothemachinecontrolsystemTheinstructionsarecombinationsofthelettersofalpha-bet,digitsandselectedsymbols,forexample,adecimalpoint,thepercentsignortheparenthesissymbols.Allin-structionsarewritteninalogicalorderandapredeterminedform.Thecollectionofallinstructionsnec
8、essarytoma-chineapartiscalledanNCProgram,CNCProgram,oraPartProgram.Suchaprogramcanbestoredforafutureuseandusedrepeatedlytoac
