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1、外文资料ThesisFirst,thedevelopmenthistoryofChina'sNCsystem1.Chinafrom1958onwards,byagroupofresearchinstitutes,collegesanduniversitiesandafewmachinetoolplantstartedtoconductresearchanddevelopmentofnumericalcontrolsystem.Atthattimeduetothelowlevelofdomesticelectroniccomponents,departments,economicandothe
2、rconstraints,unabletoobtainalargerdevelopment.2.Inthereformandopeningup,Chinawasgraduallynumericalcontroltechnologytoachievesubstantialdevelopment.AfterH65M(81——85years)andtheintroductionofforeigntechnology,n75n(8690years)isdigestedandabsorbedandthen85n(91〜1-95years)nationalorganizations,scientific
3、andtechnologicalresearch,thatmakeourcountry'sCNCtechnologyhasbeenaqualitativeleap,whentheacceptancethroughnationalresearchandidentificationofproducts,includingBeijing'sChina-IMountEverest,centralChina'scentralNCI-typeandhigh-gradeCNCShenyangNationalEngineeringResearchCenteroftheblueskyI,andothersth
4、roughthe"NationalQualitySupervisionandTestingCentermachine*1testqualifieddomesticCNCsystemssuchasNanjing,fouropencompany'sproducts.3.China'sCNCmachinetoolmanufacturingindustryinthe80yearshavehadthestageofrapiddevelopment,manymachinetoolplantproductsfromtraditionalproductstoachievethetransitiontothe
5、CNC.However,ingeneral,technicallevelisnothigh,poorquality,sointheearly90stofacethenationaleconomyfromplannedeconomytoamarketeconomyandthetransferofadjustment,hasexperiencedthemostdifficultDepressionyears,whenproductiondroppedto50%,stocksmorethanfourmonths.From1995,H95Hafterthecountryfromthestartthe
6、machinetoolmarkettoexpanddomesticdemandtostrengthentherestrictionsontheapprovalofimportsofCNCequipment,theinvestmentandkeysupportforkeynumericalcontrolsystem,equipment,technologyresearch,toCNCequipmenthasplayedasignificantroleinpromoting,especiallyin1999,thestateandthekeytothedefenseindustryintoala
7、rgenumberofcivilianindustrialsectorfundsfortechnologicalrenovation,sothatnumericalcontrolequipmentmanufacturingmarketprospered.2,CNCTechnologyandEquipmentofvehiclescuttingRead:133CNClatheprocessingtechnolog
