机械类外文翻译高速切削加工的发展及需求译文+英文毕业论文设计Word文档下载推荐.docx
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sapplicationfieldsandthedemandsituation。
High-speedmachiningisanewhigh-techwhichisorientedtothe21stcentury,high-efficiency,High-precisionandhighsurfacequalityasabasicfeature,intheautomobileindustry,aerospace,DieManufacturingandinstrumentationindustriesgainedincreasinglywidespreadapplication,andhasmadesignificanttechnicalandeconomicbenefits.contemporaryadvancedmanufacturingtechnologyanimportantcomponentpart。
HSCistoachievehighefficiencyofthecoretechnologymanufacturers,intensiveprocessesandequipmentpackagedsothatithasahighproductionefficiency.Itcanbesaidthatthehigh-speedmachiningisanincreaseinthequantityofequipmentsignificantlyimproveprocessingefficiencyessentialtothetechnology.High-speedmachiningisthemajoradvantages:
improveproductionefficiency,improveaccuracyandreducetheprocessingofcuttingresistance。
Thehigh-speedmachiningofmeaning,atpresentthereisnouniformunderstanding,therearegenerallyseveralpointsasfollows:
highcuttingspeed.usuallyfasterthanthatoftheirnormalcutting5-10times;
machinetoolspindlespeedhigh,generallyspindlespeedin-20000r/minabove10,000forhigh-speedcutting;
Feedathighvelocity,usually15-50m/minupto90m/min;
Fordifferentcuttingmaterialsandthewiringusedthetoolmaterial,high-speedcuttingthemeaningisnotnecessarilythesame;
Cuttingprocess,bladedthroughfrequency(ToothPassingFrequency)closertothe"
machine-tool-Workpiece"
systemthedominantnaturalfrequency(DominantNaturalFrequency),canbeconsideredtobehigh-speedcutting.Visibilityhigh-speedmachiningisacomprehensiveconcept。
1992.Germany,theDarmstadtUniversityofTechnology,ProfessorH.Schulzinthe52thontheincreaseofhigh-speedcuttingfortheconceptandthescope,asshowninFigure1.Thinkdifferentcuttingtargets,showninthefigureofthetransitionarea(Transition),tobewhatiscommonlycalledthehigh-speedcutting,Thisisalsothetimeofmetalcuttingprocessrelatedtothetechnicalstaffarelookingforwardto,orisexpectedtoachievethecuttingspeed。
High-speedmachiningofmachinetools,knivesandcuttingprocess,andotheraspectsspecificrequirements.Severalwerefromthefollowingaspects:
high-speedmachiningtechnologydevelopmentstatusandtrends。
Atthisstage,inordertoachievehigh-speedmachining,generalwiringwithhighflexibilityofhigh-speedCNCmachinetools,machiningcenters,Byusingadedicatedhigh-speedmilling,drilling.Theseequipmentincommonis:
Wemustalsohavehigh-speedandhigh-speedspindlesystemfeedingsystem,Cuttingcanbeachievedinhigh-speedprocess.High-speedcuttingwiththetraditionalcuttingthebiggestdifferenceisthat"
Machine-tool-workpiece"
thedynamiccharacteristicsofcuttingperformanceisstrongerinfluence.Inthesystem,themachinespindlestiffness,griporform,alongknifeset,spindleBroach,torquetoolset,Performancehigh-speedimpactareimportantfactors。
Inthehigh-speedcutting,materialremovalrate(MetalRemovalRate,MRR),unittimethatthematerialwasremovedvolume,usuallybasedonthe"
machine-tool-workpiece"
whetherProcessingSystem"
chatter."
Therefore,inordertosatisfythehigh-speedmachiningneeds,wemustfirstimprovethestaticanddynamicstiffnessofmachinespindleisparticularlythestiffnesscharacteristics.HSCreasonatthisstagetobesuccessful,averycrucialfactoristhedynamiccharacteristicsofthemasterandprocessingcapability。
Inordertobetterdescribethemachinespindlestiffnesscharacteristicsoftheprojectpresentednewdimensionlessparameter-DNvalue,usedfortheevaluationofthemachinetoolspindlestructureonthehigh-speedmachiningofadaptability.DNvalueoftheso-called"
axisdiameterperminutespeedwiththeproduct."
ThenewlydevelopedspindlemachiningcenterDNvalueshavebeengreatoveronemillion.Toreducetheweightbearing,butalsowithanarrayofsteelproductsthantothemuchmorelightceramicballbearings;
BearingLubricationmostimpressivemannermixedwithoillubricationmethods.Inthefieldofhigh-speedmachining.haveairbearingsandthedevelopmentofmagneticbearingsandmagneticbearingsandairbearingscombinedconstitutethemagneticgas/airmixingspindle。
Feedthemachinesector,high-speedmachiningusedinthefeeddriveisusuallylargerlead,multiplehigh-speedballscrewandballarrayofsmall-diametersiliconnitride(Si3N4)ceramicball,toreduceitscentrifugalandgyroscopictorque;
Byusinghollow-coolingtechnologytoreduceoperatingathighspeedballscrewastemperaturegeneratedbythefrictionbetweentheleadscrewandthermaldeformation。
Inrecentyears,theuseoflinearmotor-drivenhigh-speedsystemofupto'
SuchfeedsystemhasremovedthemotorfromworkstationstoSlideinthemiddleofallmechanicaltransmissionlinks,ImplementationofMachineToolFeedSystemofzerotransmission.Becausenolinearmotorrotatingcomponents,fromtheroleofcentrifugalforce,cangreatlyincreasethefeedrate.LinearMotorAnothermajoradvantageofthetripisunrestricted.Thelinearmotorisaverytimeforacontinuousmachineshopinpossessionofthebed.Resurfacingoftheverymeetingwhereaveryearlystagemovementcango,butthewholesystemofuptothestiffnesswithoutanyinfluence.Byusinghigh-speedscrew,orlinearmotorcangreatlyenhancemachinesystemofuptotherapidresponse.Themaximumaccelerationlinearmotorsupto2-10G(Gfortheaccelerationofgravity),thelargestfeedrateofupto60-200m/minorhigher。
2002world-renownedShanghaiPudongmaglevtrainprojectofmaglevtracksteelprocessing,UsingtheShenyangMachineToolGroupHoldingsLimitedMcNairfriendshipcompanyproductionplantsintoextra-longhigh-speedsystemforlarge-scaleprocessingcentersachieve.Themachinefeedingsystemforthelinearguideandrackgeardrive,thelargesttablefeedrateof60m/min,Quicktripof100m/min,2gacceleration,maximumspeedspindle20000r/min,themainmotorpower80kW.X-axisdistanceofupto30m,25mcuttinglongmaglevtracksteelerrorislessthan0.15mm.Maglevtrainsforthesmoothcompletionoftheprojectprovidedastrongguaranteefortechnology。
Inaddition,thecampaignmachineperformancewillalsodirectlyaffecttheprocessingefficiencyandaccuracyofprocessing.Moldandthefreesurfaceofhigh-speedmachining,themainwiringwithsmallcutdeepintomethodsforprocessing.Machinerequirementsinthefeedrateconditions,shouldhavehigh-precisionpositioningfunctionsandhigh-precisioninterpolationfunction,especiallyhigh-precisionarcinterpolation.Arcprocessingistoadoptlegislationorthreadmillingcuttermoldormachiningparts,theessentialprocessingmethods。
CuttingToolsToolMaterialdevelopment
high-speedcuttingandtechnologicaldevelopmentofthehistory,toolmaterialiscontinuousprogressofhistory.Therepresentationofhigh-speedcuttingtoolmaterialiscubicboronnitride(CBN).FaceMillingCutteruseofCBN,itscuttingspeedcanbeashighas5000m/min,mainlyforthegraycastironmachining.Polycrystallinediamond(PCD)hasbeendescribedasatoolofthe21stcenturytool,Itisparticularlyapplicabletothecuttingaluminumalloycontainingsilicamaterial,whichislightweightmetalmaterials,highstrength,widelyusedintheautomobile,motorcycleengine,electronicdevicesshell,thebase,andsoon.Atpresent,theuseofpolycrystallinediamondcutterFaceMillingalloy,5000m/minthecuttingspeedhasreachedapracticallevel.Inadditionceramictoolalsoappliestograyironofhigh-speedmachining;
ToolCoating:
CBNanddiamondcutter,despitegoodhigh-speedperformance,butthecostisrelativelyhigh.Usingthecoatingtechnologytomakecuttingtoolisthelowprice,withexcellentmechanicalproperties,whichcaneffectivelyreducethecost.Nowhigh-speedprocessingofmillingcutter,withmostofthewiringbetweentheTi-A1-Ncompositetechnologyforthewayofmulti-processing,Ifpresentinthenon-ferrousmetaloralloymaterialdrycutting,DLC(DiamondLikeCarbon)coatingonthecutterwasofgreatconcern.Itisexpectedthatthemarketoutlookisverysignificant;
Toolclampingsystem:
Toolclampingsystemtosupporthigh-speedcuttingisanimportanttechnology,Currentlythemostwidelyusedisatwo-facedtoolclampingsystem.Hasbeenformallyinvestedasacommoditymarketatthesameclampingtoolsystemare:
HSK,KM,Bigplus.NC5,AHOsystems。
Inthehigh-speedmachining,toolandfixturerotaryperformanceofthebalancenotonlyaffectstheprecisionmachiningandtoollife.itwillalsoaffectthelifeofmachinetools.So,thechoiceoftoolsystem,itshouldbeabalancedselectionofgoodproducts。
ProcessParameters
Cuttingspeedofhigh-speedprocessingofconventionalshearvelocityofabout10times.Foreverytoothcutterfeedrateremainedbasicallyunchanged,toguaranteepartsmachiningprecision,surfacequalityanddurabilityofthetool,Feedvolumewillalsobeacorrespondingincreaseabout10times,reaching60m/min,Someevenashighas120m/min.Therefore,high-speedmachiningisusuallyprecludetheuseofhigh-speed,feedanddepthofcutsmallcuttingparameters.Duetothehigh-speedmachiningcuttingcushiontendto