轴承的摩擦与润滑--机械类毕业设计外文翻译

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1、轴承的摩擦与润滑--机械类毕业设计外文翻译毕业设计论文外文翻译毕业设计论文题目工具盒盖注塑模具设计夕卜文题目FrictionLubricationofBearing译文题目轴承的摩擦与润滑系部机械系专业班级机械设计制造及其自动化学牛姓名指导教师外文文献原文FrictionLubricationofBearingInmanyoftheproblemthusfarthestudenthasbeenaskedtodisregardorneglectfrictionActuallyfrictionispr

2、esenttosomedegreewhenevertwopartsarcincontactandmoveoneachotherThetermfrictionreferstotheresistanceoftwoormorepartstomovementFrictionisharmfulorvaluabledependinguponwhereitoccursfrictionisnecessaryforfasteningdevicessuchasscrewsandrivetswhichdependupo

3、nfrictiontoholdthefastenerandthepartstogetherBeltdriversbrakesandtiresarcadditionalapplicationswherefrictionisnecessaryThefrictionofmovingpartsinamachineisharmfulbecauseitreducesthemechanicaladvantageofthedeviceTheheatproducedbyfrictionislostenergybec

4、ausenoworktakesplaceAlsogreaterpowerisrequiredtoovercometheincreasedfrictionHcatisclcstructivcinthatitcausesexpansionExpansionmaycauseabearingorslidingsurfacetofittighterIfagreatenoughpressurebuildsupbecausemadefromlowtemperaturematerialsmaymeltTherea

5、rethreetypesoffrictionwhichmustbeovercomeinmovingparts1starting2slidingand3rollingStartingfrictionisthefrictionbetweentwosolidsthattendtoresistmovementWhentwopartsareatastateofrestthesurfaceirregularitiesofbothpartstendtointerlockandformawedgingaction

6、Toproducemotioninthesepartsthewedge-shapedpeaksandval1eysofthestationarysurfacesmustbemadetoslideoutandovereachotherTherougherthetwosurfacesthegreaterisstartingfrictionresultingfromtheirmovementSincethereisusuallynofixedpatternbetweenthepeaksandvalley

7、softwomatingpartstheirregularitiesdonotinterlockoncethepartsareinmotionbutslideovereachotherThefrictionofthetwosurfacesisknownasslidingfrictionAsshowninfigurestartingfrictionisalwaysgreaterthanslidingfrictionRollingfrictionoccurswhenrollerdcvccsaresub

8、jectedtotremendousstresswhichcausethepartstochangeshapeordeformUndertheseconditionsthematerialinfrontofarollertcndstopileupandforcestheobjecttorollslightlyuphillThischangingofshapeknownasdeformationcausesamovementofmoleculesAsaresuItheatisprod