外文翻译在高速潮湿机械加工条件下后刀面表层磨损机理.doc
收藏
编号:96488
类型:共享资源
大小:1.42MB
格式:DOC
上传时间:2013-11-17
上传人:上***
认证信息
个人认证
高**(实名认证)
江苏
IP属地:江苏
6
积分
- 关 键 词:
-
专业文献
学术论文
精品文档
外文翻译
- 资源描述:
-
11CHAPTERVTOOLWEARMECHANISMSONTHEFLANKSURFACEOFCUTTINGINSERTSFORHIGHSPEEDWETMACHINING5.1IntroductionAlmosteverytypeofmachiningsuchasturning,milling,drilling,grinding...,usesacuttingfluidtoassistinthecosteffectiveproductionofpartsassetupstandardrequiredbytheproducer[1].Usingcoolantwithsomecuttingtoolsmaterialcausesseverefailureduetothelackoftheirresistancetothermalshock(likeAL2O3ceramics),usedtoturnsteel.Othercuttingtoolsmaterialslikecubicboronnitride(CBN)canbeusedwithoutcoolant,duetothetypeoftheirfunction.TheaimofusingCBNistoraisethetemperatureoftheworkpicetohighsoitlocallysoftensandcanbeeasilymachined.Thereasonsbehindusingcuttingfluidscanbesummarizedasfollows.®Extendingthecuttingtoollifeachievedbyreducingheatgeneratedandasaresultlesswearrateisachieved.Itwillalsoeliminatetheheatfromtheshearzoneandtheformedchips.®Coolingtheworkpieceofhighqualitymaterialunderoperationplaysanimportantrolesincethermaldistortionofthesurfaceandsubsurfacedamageisaresultofexcessiveheatthatmustbeeliminatedorlargelyreducedtoproduceahighqualityproduct.Reducingcuttingforcesbyitslubricatingeffectatthecontactinterfaceregionandwashingandcleaningthecuttingregionduringmachiningfromsmallchips.Thetwomainreasonsforusingcuttingfluidsarecoolingandlubrication.CuttingFluidasaCoolant:Thefluidcharacteristicsandconditionofusedeterminethecoolantactionofthecuttingfluid,whichimprovestheheattransferattheshearzonebetweenthecuttingedge,workpiece,andcuttingfluid.22Thepropertiesofthecoolantinthiscasemustincludeahighheatcapacitytocarryawayheatandgoodthermalconductivitytoabsorbtheheatfromthecuttingregion.Thewater-basedcoolantemulsionwithitsexcellenthighheatcapacityisabletoreducetoolwear[44].CuttingFluidasaLubricant:Thepurposeistoreducefrictionbetweenthecuttingedge,rakefaceandtheworkpiecematerialorreducingthecuttingforces(tangentialcomponent).Asthefrictiondropstheheatgeneratedisdropped.Asaresult,thecuttingtoolwearrateisreducedandthesurfacefinishisimproved.CuttingFluidPropertiesFreeofperceivableodorPreserveclaritythroughoutlifeKindandunirritatedtoskinandeyes.Corrosionprotectiontothemachinepartsandworkpiece.Costeffectiveintermsofftoollife,safety,dilutionratio,andfluidlife.[1]5.1.1CuttingFluidTypesTherearetwomajorcategoriesofcuttingfluidsNeatCuttingOilsNeatcuttingoilsarepoorintheircoolantcharacteristicsbuthaveanexcellentlubricity.Theyareappliedbyfloodingtheworkareabyapumpandre-circulatedthroughafilter,tankandnozzles.Thistypeisnotdilutedbywater,andmaycontainlubricityandextreme-pressureadditivestoenhancetheircuttingperformanceproperties.Theusageof33thistypehasbeendecliningfortheirpoorcoolingability,causingfirerisk,proventocausehealthandsafetyrisktotheoperator[1].®WaterBasedorWaterSolubleCuttingFluidsThisgroupissubdividedintothreecategories:1.Emulsion`mineralsoluble'white-milkycolorasaresultofemulsionofoilinwater.Containfrom40%-80%mineraloilandanemulsifyingagentbesidecorrosioninhibitors,besidebiocidetoinhibitthebacteriagrowth.2.Microemulsion`semi-synthetic'inventedin1980's,haslessoilconcentrationand/orhigheremulsifierratio10%-40%oil.Duetothehighlevelsofemulsifiertheoildropletsizeinthefluidaresmallerwhichmakethefluidmoretranslucentandeasytoseetheworkpieceduringoperation.Otherimportantbenefitisinitsabilitytoemulsifyanyleakageofoilfromthemachinepartsinthecuttingfluid,acorrosioninhibitors,andbacteriacontrol.3.Mineraloilfree`synthetic'isamixofchemicals,water,bacteriacontrol,corrosioninhibitors,anddyes.Doesnotcontainanymineraloils,andprovidesgoodvisibility.23totheworkpiece.bareinmindthatthelackofmineraloilinthistypeofcuttingfluidneedstotakemoreattentiontomachinepartslubricationsinceitshouldnotleaveanoilyfilmonthemachineparts,andmightcausesealsdegradationduethelackofprotection.5.1.2CuttingFluidSelectionManyfactorsinfluencetheselectionofcuttingfluid;mainlyworkpiecematerial,typeofmachiningoperation,machinetoolparts,paints,andseals.Table5-1preparedatthemachinetoolindustryresearchassociation[2]providessuggestionsonthetypeoffluidtobeused.445.1.3CoolantManagementToachieveahighlevelofcuttingfluidsperformanceandcosteffectiveness,acoolantrecyclingsystemshouldbeinstalledinthefactory.Thissystemwillreducetheamountofnewpurchasedcoolantconcentrateandcoolantdisposable,whichwillreducemanufacturingcost.Iteitherdonebythecompanyitselforberentedout,dependsonthebudgetandmanagementpolicyofthecompany[1].Table5-1Guidetotheselectionofcuttingfluidsforgeneralworkshopapplications.MachiningoperationWorkpiecematerialFreemachiningandlow-carbonsteelsMedium-CarbonsteelsHighCarbonandalloysteelsStainlessandheattreatedresistantalloysGrindingCleartypesolubleoil,semisyntheticorchemicalgrindingfluidTurningGeeralprpose,solubleoil,semisyntheticorsyntheticfluidExtreme-pressuresolubleoil,semi-syntheticorsyntheticfluidMillingGeneralpurpose,solubleoil,semisyntheticorsyntheticfluidExtreme-pressuresolubleoil,semi-syntheticorsyntheticfluidExtreme-pressuresolubleoil,semi-syntheticorsyntheticfluid(neatcuttingoilsmaybenecessary)DrillingExtreme-pressuresolubleoil,semi-syntheticorsyntheticfluidGearShappingExtreme-pressuresolubleoil,semi-syntheticorsyntheticfluidNeat-cuttingoilspreferable
- 内容简介:
-
-
- 温馨提示:
1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。