简析机械类毕业设计外文翻译

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1、简析机械类毕业设计外文翻译简析机械类毕业设计外文翻译___轴承的摩擦与润滑导读：ovement.adetoslideoutandovereachother.Therougherthetanyoftheproblemthusfar,thestudenthasbeenaskedtodisregardorneglectfriction.Actually,frictionispresenttosomedegreeoveoneachother.Thetermfrictionreferstotheresistanceoftorepartstomovement.Frictionisharmfulorvalu

2、abledependinguponovingpartsinamachineisharmfulbecauseitreducesthemechanicaladvantageofthedevice.Theheatproducedbyfrictionislostenergybecausenoaycauseabearingorslidingsurfacetofittighter.Ifagreatenoughpressurebuildsupbecausemadefromloperaturematerialsmaymelt.Therearethreetypesoffrictionustbeovereinmo

3、vingparts:(1)starting,(2)sliding,and(3)rolling.Startingfrictionisthefrictionbetovement.adetoslideoutandovereachother.Therougherthettheirmovement.Sincethereisusuallynofixedpatternbetatingparts,theirregularitiesdonotinterlockoncethepartsareinmotionbutslideovereachother.Thefrictionofthetendousstress.Un

4、dertheseconditions,thematerialinfrontofarollertendstopileupandforcestheobjecttorollslightlyuphill.Thischangingofshape,knoation,causesamovementofmolecules.1Asaresult,heatisproducedfromtheaddedenergyrequiredtokeepthepartsturningandoverefriction.Thefrictioncausedbytheachiningofthesurfaces.Hooothsurface

5、smayrequiretheuseofasubstancebettoreducethefrictionstillmore.Thissubstanceisusuallyalubricant.Thefilmkeepsthesurfacesapartandpreventsthecohesiveforcesofthesurfacesfrominginclosecontactandproducingheat.Anotheraterialsforthebearingsurfacesandrotatingparts.Thisexplainswhybronzebearings,softalloys,andco

6、pperandtiniolitebearingsareusedwithbothsoftandhardenedsteelshaft.Theiolitebearingisporous.Thus,whenthebearingisdippedinoil,capillaryactioncarriestheoilthro56简析机械类毕业设计外文翻译___轴承的摩擦与润滑(2)导读：fullytreatedtoremoveallforeignmaterialsseizeandinantsreducefrictio9nandthetendencytoseizebutusuallyresultinsevere

7、ostmonlyusedlubricantsareoils,greases,andgraphitepounds.Eachlubricantservesadifferentpurpose.Theconditionsunderovingsurfacesaretoinethetypeoflubricanttobeusedandthesystemselectedfordistributingthelubr