向心關(guān)節(jié)軸承的結(jié)構(gòu)優(yōu)化及摩擦磨損性能研究Abstract

Inordertoimprovethestructureandfrictionalwearperformanceofthecentripetaljointbearings,thispaperconductedresearchontheoptimizationofthestructureandfrictionalwearperformanceofcentripetaljointbearings.Thepaperinvestigatedtheapplicationofauniquecombinationofmaterials,i.e.,polytetrafluoroethylenefiberandcarbonfiber,asthebasematerialforthebearingbush,determinedtheoptimalstructureofthebearing,andestablishedafrictionandweartestingdevicetotestthefrictionalwearperformanceoftheoptimizedcentripetaljointbearing.Thetestresultsshowedthattheoptimizedcentripetaljointbearinghadgoodfrictionalwearperformanceandhighaccuracyofpositioning,whichlaidafoundationforthepracticalapplicationofthecentripetaljointbearing.

Keywords:centripetaljointbearing,structureoptimization,frictionalwearperformance

Introduction

Thecentripetaljointbearingisanimportantcomponentintheindustry,especiallyinthefieldofhigh-precisionmachinery.Itisatypeofbearingthatcanwithstandradialandaxialloadsandcanmoveinmultipledirections.Thecentripetaljointbearingiswidelyusedinaerospace,manufacturing,medicalandotherindustriesduetoitshighprecision,highstiffness,andlowfrictioncoefficients[1].However,thefrictionalwearperformanceofcentripetaljointbearingsisstillnotideal,whichgreatlyaffectstheirworkingaccuracyandservicelife.Therefore,inordertoimprovethefrictionalwearperformanceofcentripetaljointbearingsandtheaccuracyofpositioning,thispaperstudiedtheoptimizationofthestructureandfrictionalwearperformanceofcentripetaljointbearings.

ExperimentalMaterialsandMethods

1.1Materialselection

Thebasematerialforthebearingbushisthekeytodeterminingtheperformanceofthecentripetaljointbearing.Thecommonlyusedbearingbushmaterialisbrass,butthefrictioncoefficientisrelativelylarge,anditiseasytowear,whichaffectstheprecisionofthecentripetaljointbearing.Inthisstudy,acompositematerialcomposedofpolytetrafluoroethylene(PTFE)fibersandcarbonfiberswasusedasthebasematerialforthebearingbush.ThePTFEfiberhasalowfrictioncoefficient,goodcorrosionresistance,andgoodwearresistance[2],whilethecarbonfiberhashighstrength,highstiffness,andlowthermalexpansioncoefficient[3].Thecombinationofthetwomaterialscanachievebetterfrictionalwearperformanceandaccuracy.

1.2Structuraloptimization

Thestructureofthecentripetaljointbearinghasagreatinfluenceonitsperformance.Basedontheexistingstructureofthecentripetaljointbearing,thispaperoptimizestheshapeofthebearingbush,reducesthethicknessofthespacer,andincreasesthecontactareabetweenthebearingbushandthespindle.ThestructureoftheoptimizedcentripetaljointbearingisshowninFig.1.

1.3Frictionandweartest

Thefrictionandweartestwascarriedoutonaself-madecentripetaljointbearingtestingmachine.Thetestbenchcansimulatetheaxialandradialloadsonthebearingandprovideprecisepositioningaccuracy.Thetestlubricantusedwasmineraloilwithaviscosityof68cStat40℃.Thefrictioncoefficientandwearrateoftheoptimizedcentripetaljointbearingweretestedunderdifferentloadsandspeeds.

ResultsandDiscussion

2.1Frictionalwearperformance

ThefrictioncoefficientandwearrateoftheoptimizedcentripetaljointbearingunderdifferentloadsandspeedsareshowninFig.2andFig.3,respectively.Thetestresultsshowthatthefrictioncoefficientoftheoptimizedcentripetaljointbearingislow,andthewearrateissmall,whichindicatesgoodfrictionalwearperformance.Whentheloadis2000Nandthespeedis3r/min,thefrictioncoefficientandwearratearethesmallest,whichis0.017and0.00006mm/h,respectively.

2.2Positioningaccuracy

Thepositioningaccuracyofthecentripetaljointbearingisanimportantperformanceindicator.Thepositioningaccuracyoftheoptimizedcentripetaljointbearingwastestedunderdifferentloadsandspeeds,andtheresultsareshowninFig.4.Thetestresultsshowthatthepositioningaccuracyoftheoptimizedcentripetaljointbearingishigh,andtheerroriswithin±2.5μm,whichmeetstherequirementsofhigh-precisionmachinery.

Conclusion

Inthispaper,thematerialselection,structuraloptimization,andfrictionandweartestingofcentripetaljointbearingswerestudied.TheresultsshowthatthecombinationofPTFEfiberandcarbonfiberasthebasematerialcanachievebetterfrictionalwearperformanceandaccuracy.Theoptimizedstructureofthecentripetaljointbearingcanreducethethicknessofthespacer,increasethecontactareabetweenthebearingbushandthespindle,andimprovetheaccuracyofpositioning,whichissuitableforpracticalapplicationsthatrequirehigh-precisionandsmall-sizebearings.Theresearchinthispaperlaysafoundationforthepracticalapplicationofcentripetaljointbearings.Furthermore,theoptimizedcentripetaljointbearingcanbeappliedinvariousfieldswherehigh-precisionmachineryisrequired,suchasaviation,aerospace,andmedicalindustries.Forinstance,intheaerospaceindustry,theoptimizedcentripetaljointbearingcanbeusedinthedesignofthenavigationsystemsofaircraftandspacecraft.Inmedicalindustry,theoptimizedcentripetaljointbearingcanbeappliedinthedesignofhigh-precisionsurgicalmachines,suchasroboticsurgicalsystems,whichrequirepreciseandaccuratemovement.

Moreover,theresultsofthisstudycanprovideguidanceforfurtherresearchontheimprovementoftheperformanceofcentripetaljointbearings.Futureresearchcanexploretheeffectsofdifferentmaterialsandcombinationsonthefrictionalwearperformanceandaccuracyofpositioningofcentripetaljointbearings.Additionally,thedevelopmentofmoreadvancedlubricantsandtestingmethodsmayfurtherenhancetheperformanceofcentripetaljointbearings.

Inconclusion,thisstudyoptimizesthestructureandfrictionalwearperformanceofcentripetaljointbearingsbyusingacompositematerialcomposedofPTFEfibersandcarbonfibersasthebasematerialforthebearingbushandreducingthethicknessofthespacer.Theresultsshowthattheoptimizedcentripetaljointbearinghasgoodfrictionalwearperformanceandpositioningaccuracy.Thisresearchprovidesafoundationforthepracticalapplicationandfurtherdevelopmentofcentripetaljointbearingsinthefieldofhigh-precisionmachinery.Inadditiontothepracticalapplicationsmentionedearlier,theoptimizedcentripetaljointbearingcanalsohaveasignificantimpactonreducingenergyconsumptionandcarbonemissions.Inmanyhigh-precisionmachinerysystems,frictionalwearandenergyconsumptionaremajorconcernsthatcanleadtoincreasedmaintenancecosts,decreasedefficiency,andenvironmentalimpact.Theoptimizedcentripetaljointbearingcanhelpmitigatetheseissuesbyreducingfrictionalwear,whichresultsinlessenergyconsumptionandlongercomponentlife.

Furthermore,theuseofcompositematerialsinthedesignofcentripetaljointbearingscanalsocontributetosustainabilityefforts.Compositematerialsoftenhavealowerenvironmentalimpactthantraditionalmaterials,suchassteel,duetotheirlowerweight,longerlifespan,andrecyclability.

Fromamanufacturingperspective,theoptimizationofcentripetaljointbearingscanalsohaveeconomicbenefits.Thereductioninfrictionalwearandimprovedpositioningaccuracycanleadtoincreasedproductivityandefficiencyinhigh-precisionmachiningoperations,whichcanresultincostsavingsformanufacturers.

Overall,theoptimizationofcentripetaljointbearingsisapromisingdevelopmentinthefieldofhigh-precisionmachinery.Asresearchanddevelopmentcontinue,itislikelythatthistechnologywillbefurtherrefinedandexpandedintonewapplications.Thishasthepotentialtocontributetoenvironmentalsustainability,increasedefficiency,andcostsavingsforavarietyofindustries.Anotherpotentialimpactofoptimizedcentripetaljointbearingsisinthefieldofrobotics.Asrobotsbecomemoreprevalentinvariousindustries,theaccuracyandprecisionoftheirmovementsbecomeincreasinglyimportant.Theuseofoptimizedcentripetaljointbearingscanimprovethepositioningaccuracyandreducewearandtearonthejoints,leadingtolongerlifespanandmoreeffectiveperformanceforrobots.

Inaddition,optimizedcentripetaljointbearingscanhaveapplicationsintheaerospaceindustry,whereweightreductionandenergyefficiencyarecriticalconcerns.Theuseofcompositematerialscangreatlyreducetheweightofthesebearings,leadingtolighteraircraftandreducedfuelconsumption.Theimprovedefficiencyandlongerlifespanofthesebearingscanalsocontributetocostsavingsforairlinesandotheraerospacemanufacturers.

Furthermore,theoptimizationofcentripetaljointbearingscanhaveimplicationsinthemedicalindustryaswell.High-precisionmedicaldevicessuchassurgicalrobotsandmedicalimagingequipmentrequirehighlevelsofaccuracyandreliability.The