外文翻译--数控加工工艺.doc

英文原文CNCMACHININGPROCESSFIRST,OURCOUNTRYSHISTORYOFTHEDEVELOPMENTOFNUMERICALCONTROLSYSTEM1OURCOUNTRYSINCE1958,BYAGROUPOFRESEARCHINSTITUTES,COLLEGESANDUNIVERSITIESANDAFEWSTARTEDTOCNCMACHINETOOLPLANTOFTHERESEARCHANDDEVELOPMENTSYSTEMATTHATTIME,DUETOTHELOWLEVELOFDOMESTICELECTRONICCOMPONENTS,SUCHASTHEDEPARTMENTOFECONOMICCONSTRAINTS,LACKOFALARGERDEVELOPMENT2INTHEREFORMANDOPENINGUP,CHINASNUMERICALCONTROLTECHNOLOGYGRADUALLYACHIEVESUBSTANTIALDEVELOPMENTAFTER658185YEARSTHEINTRODUCTIONOFFOREIGNTECHNOLOGY,758690YEARSOFTHEDIGESTIONANDABSORPTIONANDTHEEIGHTHFIVEYEARPLAN91195YEARSNATIONALORGANIZATIONOFSCIENTIFICANDTECHNOLOGICAL,THATMAKESOURCOUNTRYSCNCTECHNOLOGYHASAQUALITATIVELEAPINACCEPTANCEATTHATTIME,THROUGHRESEARCHANDIDENTIFICATIONOFCOUNTRYPRODUCTSINCLUDINGBEIJINGEVERESTSCHINESEI,CENTRALCHINASCENTRALNCIANDAFEWHIGHENDSHENYANGNATIONALENGINEERINGRESEARCHCENTERFORCONTROLOFBLUEI,ASWELLASOTHERTHROUGHTHENATIONALQUALITYSUPERVISIONANDTESTCENTERMACHINETESTNCSYSTEMOFQUALIFIEDDOMESTICCOMPANIESSUCHASNANJING,FOURPR