内燃机摩擦副表面多脉冲激光微造型实验与仿真研究

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1、万方数据江苏大学硕士学位论文ABSTRACTIntheprocessofenergyconversionandtransmissioninanintemalcombustionengine，powerconsumptioncausedbyfrictionbetweenmovingpartsaccountedformorethan60％oftheinternalcombustionenginemechanicalloss．Withthecontinuousincreasingofrotationspeedandto

2、rqueformodemintemalcombustionengine，theperformanceoftheintemalcombustionenginehasbeeninfluencedbyfrictionpowerseriously．Therecentresearchshowsthatsomemicro-texturesprocessedbyhighenergydensitylaserinthesurfaceoffrictionpairCanreducefrictioncoefficienteffectiv

3、ely．ThemachiningqualityandprecisionismuchhigherthanthetraditionalmechanicalhoningSotoreducetheintemalcombustionenginemechanicallossbylasermicro—texturetechnologyhasbecomethefocusofresearchscholars．ThisarticleusednewlasersurfaceprocessingdeviceJDWZX-002develop

4、edindependentlyand45#steelastheprocessingmaterial．Complexmicro-groovemorphologywasresearched．ThroughcomparingtestresultsmeasuredbyVEECOprofilometer,theinfluenceoflaserpowerandscanningspeedontheshapesize(radiusanddepth)andqualityofthemicro-groovewereinvestigat

5、ed．Onthebasisofexperimentalresearch，afiniteelementmodelWasestablishedbyANSYSsoftware，anewnumericalsimulationprocessoflasermicro-texturingwasproposedandmaterialremovalprocessandupdateofcalculationdomainwereachievedintheprocessoflaserablation．Boundaryconditions

6、usedthetestresultsoflaserpower，energydistributionandprocessingparameters．Thetemperaturedistributionandmicro-textures(microcavityandmicrogroove)werestudiedunderdifferentlaserpower,pulserepetitionnumberlaserSCanspeedbynumericalsimulation．Comparedwimtheexperimen

7、tresultsandthesimulationresults，thedifferencesbetweensimulationandexperimentwerelessthan10％，whichillustratedthevalidityandaccuracyofthecalculationmethod．Finallyaftercontrastdifferentprocessingconditionsresults，abestgroupofprocessingconditionswaschoseasmicro-c

8、avitymachiningparametersofcylinderlinerininternalcombustionengine．Throughcomparingtheperformanceoforiginalengineandlaserprocessedoneofsinglecylinderdieselenginemachinespeedcharacteristics