新型低溫MQL裝置的研制與難加工材料低溫高速切削機理研究.pdf

1、南京航空航天大學(xué)博士學(xué)位論文新型低溫MQL裝置的研制與難加工材料低溫高速切削機理研究姓名：蘇宇申請學(xué)位級別：博士專業(yè)：機械制造及其自動化指導(dǎo)教師：何寧20070601新型低溫MQL裝置的研制與難加工材料低溫高速切削機理研究IVAbstractDifficulttomachinematerialshavebeenwidelyusedintheaerospaceweaponchemicalelectronicindustry.However

2、rapidtoolwearisthebottleneckthatrestrictstheenhancementofmachiningefficiencyofdifficulttomachinematerials.AsoneoftheeffectiveapproachescryogenicMQLmayimprovethemachiningefficiencyofdifficulttomachinematerialsbetterthanth

3、ecurrenttechniques.AimingatsomeproblemssuchasthekeytechnologiesofcryogenicMQLitsapplicationinthemachiningofdifficulttomachinematerialsthegropingresearchwasconductedinthisdissertation.Themainresearchwksareincludedasfollow

4、s:1.CompositerefrigerationmethodwasadoptedtodevelopnewcryogenicMQLequipmentmeanwhileexperimentswerecarriedouttotestitsperfmance.Theresultsindicatethatthisequipmenthasmanymeritssuchashighrefrigerationspeedadjustmentcapaci

5、tycredibilitycontrolabilitiesofthetemperatureofrefrigeratedgaswhichprovidesaneweffectivemeansftheresearchapplicationofcryogenicMQLcuttingtechnology.2.Bycomparingthecuttingtemperaturecuttingfcefrictionstateattherakefaceof

6、cuttingtoolinthehighspeedcuttingoftitaniumalloysunderdifferentcoolinglubricationconditionsthecoolinglubricationeffectofcryogenicMQLwasinvestigated.ThecoolinglubricationmechanismofcryogenicMQLinthehighspeedcuttingwasdiscl

7、osedasfollows:thegoodcoolingeffectofcryogenicMQLreducestheevapationofcuttingoilbenefitsthemaintenanceofstrengthoflubricationfilmthusimprovingthelubricationeffectofcuttingoil.3.Highspeedturningexperimentsofnickelbasedallo

8、yswereconductedtoinvestigatetheinfluenceofcoolinglubricationconditionsontoolwearsurfaceroughnesschipshape.ThetoolwearmechanisminthehighspeedturningofnickelbasedalloyswasanalyzedundercryogenicMQLcondition.Theeffectmechani