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1、外文资料 Thesis First,thedevelopmenthistoryofChina'sNCsystem 1.Chinafrom1958onwards,byagroupofresearchinstitutes,collegesanduniversitiesandafewmachinetoolplantstartedtoconductresearchanddevelopmentofnumericalcontrolsystem.Atthattimeduetothelowlevelofdomesticele
2、ctroniccomponents,departments,economicandotherconstraints,unabletoobtainalargerdevelopment. 2.Inthereformandopeningup,Chinawasgraduallynumericalcontroltechnologytoachievesubstantialdevelopment.After"65"(81----85years)andtheintroductionofforeigntechnology,"75"(8
3、6------90years)isdigestedandabsorbedandthe"85"(91~1-95years)nationalorganizations,scientificandtechnologicalresearch,thatmakeourcountry'sCNCtechnologyhasbeenaqualitativeleap,whentheacceptancethroughnationalresearchandidentificationofproducts,includingBeijing'sCh
4、ina-IMountEverest,centralChina'scentralNCI-typeandhigh-gradeCNCShenyangNationalEngineeringResearchCenteroftheblueskyI,andothersthroughthe"NationalQualitySupervisionandTestingCentermachine"testqualifieddomesticCNCsystemssuchasNanjing,fouropencompany'sproducts. 3.
5、China'sCNCmachinetoolmanufacturingindustryinthe80yearshavehadthestageofrapiddevelopment,manymachinetoolplantproductsfromtraditionalproductstoachievethetransitiontotheCNC.However,ingeneral,technicallevelisnothigh,poorquality,sointheearly90stofacethenationaleconom
6、yfromplannedeconomytoamarketeconomyandthetransferofadjustment,hasexperiencedthemostdifficultDepressionyears,whenproductiondroppedto50%,stocksmorethanfourmonths.From1995,"95"afterthecountryfromthestartthemachinetoolmarkettoexpanddomesticdemandtostrengthentherestr
7、ictionsontheapprovalofimportsofCNCequipment,theinvestmentandkeysupportforkeynumericalcontrolsystem,equipment,technologyresearch,toCNCequipmenthasplayedasignificantroleinpromoting,especiallyin1999,thestateandthekeytothedefenseindustryintoalargenumberofcivilianind
8、ustrialsectorfundsfortechnologicalrenovation,sothatnumericalcontrolequipmentmanufacturingmarketprospered. 2,CNCTechnologyandEquipmentofvehiclescutting Read:133 C
