自由切削刀具設(shè)計理論與方法的研究及其應(yīng)用.pdf

1、華中理工大學(xué)博士學(xué)位論文自由切削刀具設(shè)計理論與方法的研究及其應(yīng)用姓名：閆興申請學(xué)位級別：博士專業(yè)：機械制造及其自動化指導(dǎo)教師：師漢民2000.6.1華中理工大學(xué)博士學(xué)位論文AbstractTheprojectstudiedinthisdissertationis”Researchonfreecuttingtechniquesandonthetheoryandmethedsfoffreecuttingtoolsdesign”，suppor

2、tedbytheNationalNaturalScienceFoundationofChina(GrantNo59675085)ThecuringtechniqueasthemosteconomicmethodformachiningprecisemechanicaIparts，playsandwillplayanimportantroleinmechanicalmanufacturingatpresentandintheforesee

3、ablefutureMetalcuringprocessescanbecategorized∞freecuttingandnonfleecuringThelaRerischaracterizedbychipejectioninterferenceoverallsegmentsofthecuttingedgeMostofthepracticalmachiningoperationsareofnonfreecutting，whichlead

4、stointensechipdeformation，highcuringpowerconsumption，highcuringtemperature，acceleratedtoolwearandroughsurfacefinishRealizingfreecuttingisaneffectivemethodtoimprovecuttingprocessesThekeypointofthisdisseRationisthedevelopm

5、entandapplicationofthetheoryforcuringtoolsdesignFirstlythefundamentaltheoryofnon—freecuringisintroduced，including”PrincipleofMinimumEnergy”(PME)ofelementarycuttingtools(ECT)，chipejectioncompromiseundertheconditionofnonfk

6、ecuring”thedegreeofnonfreedom”andtheconditionofrealizingfrcecuringBasedonthefundamentaltheoryofnonfreecuring，themethodsforrealizingfreecuringthroughcuttingtoolsgeometrydesignarestudiedandappliedtocementedcarbideinsertsMa

7、ininnovativeachievementsinthisdissertationarethefollowings1Theconceptof”Stablerplane”issuggestedandatheoremaboutStabletplaneisdemonstratedThecuttingedgeoffreecuringtoolwithchip—ejectionmotionastranslationandcommonreferen

8、ceplanemustbeaCUIVOinStablerplaneifStablerslawisrightViceversa，thechipejectiondirectionofruledsurfacetoolwithcuringedgeasanyCurveinStablerplaneandsupposedchipejectiondirectionasruledsurfacegeneratrixmustbealongruledsurfa

9、cegeneratrixateverypointofcuttingedgeThistheoremprovidesguidelinesforfreecuringtooldesign2HowtobalancebetweenECTs’performanceandchipejectioncompromise，wefound，isakeyprobleminfreecuttingtooldesignElementarycuttingtoolexpe

10、rimentsshowthatnormalrakeangleororthogonalrakeanglehasessentialinfluenceollECTs’performanceSo，twocriteriaforfreecuringtooldesignweresuggested(a)ReducingthechipejectioninterferencebymeansofadjustingthetoolinclinationSOast

11、odredgechipejectiondirectionsoverallthesegmentsofthecuringedge；(b)KeepingnormalrakeangleororthogonalrakeangleinareasonablerangeforalllheECTswhileinclinationanglevarying3AkindoffreecuringtoolwithgoodcuttingperformanceWasd

12、evelopedComparedwithaconventionalinsert，thecuringforceofthiskindfree—cuttingtoolisreducedbymorethan10％Chipsflowsmoothlychip。ejectiondirectionchangesjustslightlywhenthecuttingconditionisvaryinggreatlyThechipsbreaksteadily