外文翻译Microsoft Word 文档

《外文翻译Microsoft Word 文档》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、BURRFORMATIONINMICRO-DRILLINGBorisKiha,DavidA.1.UniversityofTechnologyatAachen(RWTH),Aachen,Germany2.UniversityofCaliforniaatBerkeley,Berkeley,CAKeywords:burrformation,micro-machining,micro-burr,micro-drillingAbstractExperimentalstudiesonmicro-drillinginaluminumalloyandsteelhavebeen

2、carriedout.Drillingexperimentswithdifferentfeedtodiameterratios,cuttingspeedsand130μm,250μm,500μmdrillswereconducted.Theinfluenceofthecuttingparametersonburrsizeandburrtypewasobserved.Acomparisontoburrformationinconventionaldrillingispresented.IntroductionMostmachiningprocessesprodu

3、ceburrs.Theseburrscauseseveralproblemsforproductqualityandfunctionalityastheycaninterferewithassemblyofpartsormayreducethefatiguelife.Deburringofmicro-structuresisespeciallydifficultduetobadaccessibilityandtighttolerances.Insomecases,duetopartfragilityoredgetolerances,deburringofmic

4、ro-partsisnotpossible.Therefore,reducingburrisveryimportantinmicro-machining.Understandingtheburrformationanditsdominantparametersisessentialforpredictingandreducingburr.Veryfewstudies[1][2]havebeenperformedontheburrsresultingfrommicro-drilling.Micro-burrformationinaluminumalloyhasb

5、eeninvestigatedwithrespecttocuttingconditions[2].Thefundamentalmechanismsarenotwellunderstood.Previousresearch[3]hadestablishedbasicburrtypesintheconventionaldrillingoflowallysteel.Burrshapeisthemostimportantbecausetheburrsize,andasaresult,deburringcostisgreatlydependentonit.Threedi

6、fferentshapesofburrswereobservedasseeninFigure1.Theuniformburrhasrelativelysmallanduniformburrheightandthicknessaroundtheholeperiphery.Thecrownburrhasalargerandirregularheightdistributionaroundthehole.Thetransientburrisatypeofburrformedinthetransientstagebetweentheuniformburrandthec

7、rownburr.Theworkpresentedinthispaperinvestigatesthefactorswhichsignificantlyinfluencetheburrformationprocessinmicro-drilling.Theburrswhichresultfrommicro-drillinginthedifferentmaterialshavebeencharacterizedandarecomparedtoconventionaldrilling.Analysisofthedatafortheeffectofdiameter,

8、cuttingspeedandfeed