内燃机摩擦副表面多脉冲激光微造型实验和仿真-研究

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

2、engine，theperformanceoftheintemalcombustionenginehasbeeninfluencedbyfrictionpowerseriously．Therecentresearchshowsthatsomemicro-texturesprocessedbyhighenergydensitylaserinthesurfaceoffrictionpairCanreducefrictioncoefficienteffectively．Themachiningqualityandprecisionismuchhigherthanthetrad

3、itionalmechanicalhoningSotoreducetheintemalcombustionenginemechanicallossbylasermicro—texturetechnologyhasbecomethefocusofresearchscholars．ThisarticleusednewlasersurfaceprocessingdeviceJDWZX-002developedindependentlyand45#steelastheprocessingmaterial．Complexmicro-groovemorphologywasresea

4、rched．ThroughcomparingtestresultsmeasuredbyVEECOprofilometer,theinfluenceoflaserpowerandscanningspeedontheshapesize(radiusanddepth)andqualityofthemicro-groovewereinvestigated．Onthebasisofexperimentalresearch，afiniteelementmodelWasestablishedbyANSYSsoftware，anewnumericalsimulationprocesso

5、flasermicro-texturingwasproposedandmaterialremovalprocessandupdateofcalculationdomainwereachievedintheprocessoflaserablation．Boundaryconditionsusedthetestresultsoflaserpower，energydistributionandprocessingparameters．Thetemperaturedistributionandmicro-textures(microcavityandmicrogroove)we

6、restudiedunderdifferentlaserpower,pulserepetitionnumberlaserSCanspeedbynumericalsimulation．Comparedwimtheexperimentresultsandthesimulationresults，thedifferencesbetweensimulationandexperimentwerelessthan10％，whichillustratedthevalidityandaccuracyofthecalculationmethod．Finallyaftercontrastd

7、ifferentprocessingconditionsresults，abestgroupofprocessingconditionswaschoseasmicro-cavitymachiningparametersofcylinderlinerininternalcombustionengine．Throughcomparingtheperformanceoforiginalengineandlaserprocessedoneofsinglecylinderdieselenginemachinespeedcharacteristics