新型疊層復(fù)合陶瓷刀具的研制及其切削性能研究.pdf

1、山東大學(xué)碩士學(xué)位論文新型疊層復(fù)合陶瓷刀具的研制及其切削性能研究姓名：段振興申請學(xué)位級別：碩士專業(yè)：機械制造及其自動化指導(dǎo)教師：鄧建新20090510ABSTRACTABSTRACTCeramiccuttingtoolsareusedmorewidelyinindustrialproduction，becausetheyhavehighhardness，hi曲meltingpoint，goodthermalstabilitygoodwea

2、rresistance，andmanyotheradvantagesNevertheless，theirwidespreaduseislimitedbytheirdisadvantageofbrittlenessInthearticle，layeredceramiccompositecuttingtoolsweredevelopedAndthecuttingperformance，wearpropertiesandmechanismsw

3、eredetailedstudiedThelayeredmodelswereestablishedandthedistributionsoftheresidualstressesinthelayeredceramiccompositeswerestudiedbythemeansoffiniteelementmethodTheinfluencesofthenumberoflayersandthicknessratioonthesurfac

4、eresidualstresseswerestudiedTheresultsindicatethatthelayerofsurfaceformedresidualcompressivestressandthelayerofinnerformedresidualtensilestressThevalueofresidualcompressivestressonthesurfaceincreasedwimthethicknessratioo

5、rthenumberoflayersrisingThesurfaceresidualcompressivestressofA3—8layeredmodelWas一287MPaAuniformresidualcompressivestresszoneformednearthecenterLayeredceramicmaterialswithdifferentlayersorthicknessratiosWe：lepreparedTheme

6、chanicalpropertiesoflayeredceramicmaterialsweremeasuredAndthemicrostructureofthelayeredceramicmaterialsWasstudiedTheresearchesindicatethatthefracturetoughnessandthehardnessofthelayeredceramicmaterialsincreasedwiththethic

7、knessratioorthenumberoflayersrisingThefracturetoughnessofthesurfaceforlayeredceramicmaterialswith7layerswas1005MPam拋，andthehardnessWas22GPaThemechanicalpropertiesoflayeredceramicmaterialswouldbebetterifthesurfaceWasthinn

8、erTheresidualStresSeffectedthegrowthofthesurfacecrackindifferentdirectionWearpropertiesandmechanismsofthelayeredceramiccuringtoolswerecomparedwimthesinglelayercuttingtoolwhencutting45#hardenedsteelandcastironQT420—10Thes