1、天津大學(xué)碩士學(xué)位論文旋轉(zhuǎn)超聲加工及其關(guān)鍵技術(shù)的研究姓名：倪皓申請(qǐng)學(xué)位級(jí)別：碩士專(zhuān)業(yè)：精密儀器與機(jī)械指導(dǎo)教師：房豐洲20090901AbstractHardandbrittlematerialssuchasopticalglass，crystalceramics，havelotsofadvantages：highstrengthresistancetoelevatedtemperature，standwearandtearereTheyh

2、avebeenwidelyappliedtothefieldsofaviationautomobile，medicaltreatment，andprecisionmoldJustbecauseoftheirgoodperformance，itisquitedi伍cultandinefficienttomachinethemusingCX)I／lmonmethodsAsaresulttheirapplicationislimitedWit

3、hthedevelopmentofscienceandmodemindustrynon‘conventionalmachiningmethodsemergeToalargeextenttheproblemsonthemachiningofhardandbrittlematerialscanbesolvedAsoneofthenon‘conventionalmachiningmethods，rotaryultrasonicmachinin

4、g(RUM)canbeappliedtoalmostallthehardandbrittlematerialsInadditionithastheadvantagesoflesscuttingforceandlesscuttingheatetcTherefore，theRUMhasbeenusedwidelyanditdevelopsquicklyNowmostoftheRUMmachinetoolsworkatasinglefrequ

5、encysothesizeofthetoolsislimitedstrictlyanditleadstotheinconvenienceinpracticalproductionapplicationInthispaperourworkisasfollow：1)Thispaperanalysesanewtechnique：frequencyadjustablerotaryultrasonicmachiningtechnique，usin

6、gthetheoryofacoustics，andrevealstherealizationoffrequencyadjustability2)BasedontheanalysisofeverypartoftheRUMsystemwemadeafrequencyadjustablerotaryultrasonicmachiningsystemwhichcanbefixedoncommonmachinet0013)Severalholem

7、achiningandplanemachiningexperimentswerecarriedonhardandbrittlematerialssuccessfullyItprovesthatouradjustablefrequencyRUMsystemcanbeusedinpracticeButoursystemCannotavoidthecommonproblemsofmachiningbrittleandhardmaterials

8、：edge—chippingBasedonfiniteelementanalysis(FEA)，weproposeamethodtochangethestressdistributiontoreduceedgechippingFinallyexperimentsareconductedtovalidatetheeffectivenessofthismethodKEYWORDS：HardandbrittlematerialRotaryul