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学号：

20040802

姓名：

陈美光

专业：

机械设计制造及其自动化

指导老师：

黄松和

2008年6月

外文翻译

英文原文

High-speedmachininganddemandforthedevelopmentof

High-speedmachiningiscontemporaryadvancedmanufacturingtechnologyanimportantcomponentofthehigh-efficiency,High-precisionandhighsurfacequality,andotherfeatures.ThisarticlepresentsthetechnicaldefinitionofthecurrentstateofdevelopmentofChina'

sapplicationfieldsandthedemandsituation.

High-speedmachiningisorientedtothe21stcenturyanewhigh-tech,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,feedandd