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机械专业中英文文献翻译英文原文CNCMachiningProcessFirst,ourcountry'shistoryofthedevelopmentofnumericalcontrolsystem1.Ourcountrysince1958,byagroupofresearchinstitutes,collegesanduniversitiesandafewstartedtoCNCMachineToolPlantoftheresearchanddevelopmentsystem.Atthattime,duetothelowlevelofdomesticelectroniccomponents,suchasthedepartmentofeconomicconstraints,lackofalargerdevelopment.2.Inthereformandopeningup,China'snumericalcontroltechnologygraduallyachievesubstantialdevelopment.After65(81----85years)theintroductionofforeigntechnology,75(86------90years)ofthedigestionandabsorptionandtheEighthFive-YearPlan(91~1-95years)NationalOrganizationofscientificandtechnological,thatmakesourcountry'sCNCtechnologyhasaqualitativeleapinacceptanceatthattime,throughresearchandidentificationofcountryproductsincludingBeijingEverest'sChineseI,centralChina'scentralNCIandafewhigh-endShenyangNationalEngineeringResearchCenterforControlofBlue-I,aswellasotherthroughtheNationalQualitySupervisionandTestCentermachinetestNCsystemofqualifieddomesticcompaniessuchasNanjing,fourproducts.3.China'sCNCmachinetoolmanufacturingindustryinthe80'shadthestageofrapiddevelopment,manymachinetoolplantproductsfromtraditionalproductstotheNCtransition.But,generallyspeaking,thetechnologicallevelisnothigh,thequalityofthepoor,sointheearly90'sfacingthecountry'seconomyfromaplannedeconomytoamarketeconomyandadjustthetransferwentthroughthemostdifficultyearsoftheDepressionperiod,theproductioncapacityatthattimedownto50%,morethanfourmonthinventory.From1995,NinthFive-YearPlantoexpanddomesticdemandfromthecountryafterthemachinetoolmarkettostart,soastoreinforcetheapprovalofimportsofCNCequipment,investmentfocusedonsupportforkeynumericalcontrolsystem,equipment,technologiesofCNCequipmenthasplayedasignificantrole,especiallyin1999,thecountry'sdefenseindustrytocivilianindustryandthekeytoputtinginalotoftechnicaldepartmentfunds,toenableCNCequipmentmanufacturermarketthriving.Three,CNCTechnologyandEquipmentofcarscutCNCLatheMachiningLathetechnologyandprocessingtechnologysimilarto,butbecauseofCNClatheisafixture,forautomaticprocessingofallfinishturningprocess,whichshouldpayattentiontothefollowingaspects.1.Areasonableselectioncuttingforthehigh-efficiencymetal-cuttingprocessing,theprocessedmaterials,cuttingtools,cuttingconditionsisthethreemajorelements.Thesedeterminetheprocessingtime,toollifeandprocessingquality.Cost-effectiveprocessingmethodsmustbeareasonablechoiceofthecuttingconditions.Threeelementsofcuttingconditions:cuttingspeed,feedrateandcuttingdepthofthedamagedirectlycausedbythetool.Withtheincreaseincuttingspeed,tooltiptemperaturewillrise;willhavemechanical,chemical,thermalwearandtear.20%increaseincuttingspeed;toollifewillreducethe1/2.Feedconditionsandtherelationshipbetweentoolwearandtearatthebackofaverysmallareaof.However,thefeedrate,cuttingtemperaturerise,wearbigbehind.Thantheimpactofcuttingspeedontoolsmall.Depthofcutonthetoolsdidnotaffectthecuttingspeedandfeedrate,butatsmallcuttingdepthofcutwhencuttingmaterialshavebeen机械专业中英文文献翻译hardenedlayer,whichwillaffectthetoollife.Theuserisprocessedaccordingtothematerial,hardness,cuttingstatus,materialtype,feedrate,cuttingdepth,suchastheoptionofusingthecuttingspeed.Themostappropriateselectionsofprocessingconditionsareatthebasisofthesefactorsisselected.Haverules,stability,wornandtearistoachievetheidealconditionsforlife.However,inactualoperation,theselectiontoollifeandtoolwear,thesizeofchangesinprocessing,surfacequality,cuttingnoise,heatprocessingandsoon.Indeterminingtheprocessingconditionsrequiredtostudytheactualsituation.Theheat-resistantalloyssuchasstainlesssteelandhardmaterials,thecoolantcanbeusedbesttouserigidblade.2.Reasonableselectiontool1)whenrough,itisnecessarytochoosehighstrength,gooddurabilitytool,inordertomeettheroughknifewheneatinglargebackvolume,thefeedrequirements.2)Finecar,itisnecessarytochoosehighprecision,durabilitygoodtooltoensurethattherequirementsofmachiningaccuracy.3)Inordertoreducetoolchangetimeandconvenienceoftheknifeshouldbeusedmachinesandmachinefolderknifeblade.3.AreasonableselectionFixture1)Generalselectiontrytheworkpiececlampingfixturetoavoidtheuseofadedicatedfixture;2)positioningthebasepartsoverlapsoastoreducethepositioningerror.4.Todeterminetheprocessingrouteprocessingrouteistheindex-controlledmachiningprocess,toolpartsrelativetrajectoryanddirectionofSports.1)Shouldbeabletoensurethemachiningaccuracyandsurfaceroughnessrequirements;2)shouldtrytoshortentheprocessingroute,reducingtraveltimeandairknives.5.ProcessingrouteofcontactwithallowanceAtpresent,CNClatheshavenotyetachievedtheuniversalaccesstoconditions,thegeneralshouldbeputontoomuchroughmargin,especiallywithforging,castinghardcushioncortexingenerallatheprocessing.MustbesuchasCNClathe,theneedtopayattentiontoprocessflexibility.6.Fixturetoinstallthemainpointsatpresent,thehydraulicclampingchuckandhydrauliccylinderareconnectedbytherodoftheimplementation,inFigure1.Hydraulicclampingchuckasfollows:Firstofall,bymovingonhandtounloadthenuthydrauliccylinder,thedischargeofSLIDE,andback-endfro