机械毕业设计英文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.docx
- 文档编号:1309065
- 上传时间:2022-10-20
- 格式:DOCX
- 页数:31
- 大小:833.13KB
机械毕业设计英文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.docx
《机械毕业设计英文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.docx》由会员分享,可在线阅读,更多相关《机械毕业设计英文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.docx(31页珍藏版)》请在冰豆网上搜索。
机械毕业设计英文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
CHAPTERV
TOOLWEARMECHANISMSONTHEFLANKSURFACEOFCUTTINGINSERTS
FORHIGHSPEEDWETMACHINING
5.1Introduction
Almosteverytypeofmachiningsuchasturning,milling,drilling,grinding...,usesacuttingfluidtoassistinthecosteffectiveproductionofpartsassetupstandardrequiredbytheproducer[1].Usingcoolantwithsomecuttingtoolsmaterialcausesseverefailureduetothelackoftheirresistancetothermalshock(likeAL2O3ceramics),usedtoturnsteel.Othercuttingtoolsmaterialslikecubicboronnitride(CBN)canbeusedwithoutcoolant,duetothetypeoftheirfunction.TheaimofusingCBNistoraisethetemperatureoftheworkpicetohighsoitlocallysoftensandcanbeeasilymachined.Thereasonsbehindusingcuttingfluidscanbesummarizedasfollows.
®Extendingthecuttingtoollifeachievedbyreducingheatgeneratedandasaresultlesswearrateisachieved.Itwillalsoeliminatetheheatfromtheshearzoneandtheformedchips.
®Coolingtheworkpieceofhighqualitymaterialunderoperationplaysanimportantrolesincethermaldistortionofthesurfaceandsubsurfacedamageisaresultofexcessiveheatthatmustbeeliminatedorlargelyreducedtoproduceahighqualityproduct.
Reducingcuttingforcesbyitslubricatingeffectatthecontactinterfaceregionandwashingandcleaningthecuttingregionduringmachiningfromsmallchips.Thetwomainreasonsforusingcuttingfluidsarecoolingandlubrication.
CuttingFluidasaCoolant:
Thefluidcharacteristicsandconditionofusedeterminethecoolantactionofthecuttingfluid,whichimprovestheheattransferattheshearzonebetweenthecuttingedge,workpiece,andcuttingfluid.Thepropertiesofthecoolantinthiscasemustincludeahighheatcapacitytocarryawayheatandgoodthermalconductivitytoabsorbtheheatfromthecuttingregion.Thewater-basedcoolantemulsionwithitsexcellenthighheatcapacityisabletoreducetoolwear[44].
CuttingFluidasaLubricant:
Thepurposeistoreducefrictionbetweenthecuttingedge,rakefaceandtheworkpiecematerialorreducingthecuttingforces(tangentialcomponent).Asthefrictiondropstheheatgeneratedis
dropped.Asaresult,thecuttingtoolwearrateisreducedandthesurfacefinishisimproved.
CuttingFluidProperties
Freeofperceivableodor
Preserveclaritythroughoutlife
Kindandunirritatedtoskinandeyes.
Corrosionprotectiontothemachinepartsandworkpiece.
Costeffectiveintermsofftoollife,safety,dilutionratio,andfluidlife.[1]
5.1.1CuttingFluidTypes
Therearetwomajorcategoriesofcuttingfluids
NeatCuttingOils
Neatcuttingoilsarepoorintheircoolantcharacteristicsbuthaveanexcellentlubricity.Theyareappliedbyfloodingtheworkareabyapumpandre-circulatedthroughafilter,tankandnozzles.Thistypeisnotdilutedbywater,andmaycontainlubricityandextreme-pressureadditivestoenhancetheircuttingperformanceproperties.Theusageofthistypehasbeendecliningfortheirpoorcoolingability,causingfirerisk,proventocausehealthandsafetyrisktotheoperator[1].
®WaterBasedorWaterSolubleCuttingFluids
Thisgroupissubdividedintothreecategories:
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.bareinmindthatthelackofmineraloilinthistypeofcutting
fluidneedstotakemoreattentiontomachinepartslubricationsinceitshouldnotleaveanoilyfilmonthemachineparts,andmightcausesealsdegradationduethelackofprotection.
5.1.2CuttingFluidSelection
Manyfactorsinfluencetheselectionofcuttingfluid;mainlyworkpiecematerial,typeofmachiningoperation,machinetoolparts,paints,andseals.Table5-1preparedatthemachinetoolindustryresearchassociation[2]providessuggestionsonthetypeoffluidtobeused.
5.1.3CoolantManagement
Toachieveahighlevelofcuttingfluidsperformanceandcosteffectiveness,acoolantrecyclingsystemshouldbeinstalledinthefactory.Thissystemwillreducetheamountofnewpurchasedcoolant
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- 机械 毕业设计 英文 外文 翻译 高速 潮湿 加工 条件下 后刀面 表层 磨损 机理