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SimulationAnalysisandOptimalDesignofBackClampDevicePingYU,Si-JieKANGa*,Yan-JiaoLI,En-ChaoJINMechanicalScienceandEngineeringInstituteofJilinUniversity,Changchun,ChinaaKangsijie@163.
com*CorrespondingauthorKeywords:backclampdevice,dynamicanalysis,orthogonaloptimizingdesign.
Abstract.
Backclampdeviceisthekeyequipmentofthetopdrive,whichisrequiredoperationreliableandcompactstructure.
Thispaperintroducestheworkingprocessandworkingprincipleofthebackclamp,Accordingtotheoperationschemeandperformanceparametersofthebackclamp,Dynamicssimulationanalysiswascarriedout.
Obtainthecontactforcebetweenthejawanddrillpipe,aswellasforceandotherperformanceparametersofclampteeth.
Thebasicideaoforthogonaloptimizationmethodistooptimizetheparametersoftoothprofile,toothheightandtoothpitchofthejaw,andtheparameteroptimizationcombinationisgained.
Finally,UsingtheANSYSWorkbenchforthefiniteelementstaticsanalysisofthebackclamp,theresultsshowthatthedesignandfunctionalrequirementsoftheapplicationaremet.
DesignandExistingProblemsofBackClampDeviceDuetotheoverallfloatingofthebackclampingdeviceintheprocessofclampingandloosening,thewholefloatishighlyrequired.
Thereforeneedtoensurethatthefloatingprecisionofthebackclampfloatingmechanism,SchematicdiagramofthebackclampisshownintheFig.
1~Fig.
2,Theconfigurationofthespringhasaveryimportantroleinthebackclampingdevice,Oneistobeabletolimittheposition,andtheotheristoeasetheinertiaofthehydrauliccylindercausedbytherapidmovement.
Theoutershellbodyoftheclampingmechanismadoptsthesplitstructureoftheleftclampbodyandtherightclampbody.
Thesplittypestructuredesignisconvenienttodisassembleandreducetheauxiliarytimetomaintenanceoftheequipment,andimproveworkefficiency.
Fig.
1BackclampdeviceFig.
2BackclampfloatingmechanismThewholestructureoftheexistingbackclampingmechanismiscompactandcomplete,andtheoperationisflexible,Safeandreliable,Buttheactualoperationoftheprocessalsofoundthatthenumberofdiscardedclamptoothanddrillpipeisrelativelylarge,Themainreasonforthefailureisthewearorfractureofthejaw,Thejawisapartofthebackclampdevice,whichisdirectlyunderthepressureandthefrictionforce.
Thequalityofthejawisdirectlyrelatedtotheworkingefficiencyandtheservicelifeofthedrillingtools.
Fig.
3FigureofdrillpipefailureFig.
4WearmapofjawDynamicSimulationAnalysisoftheBackClampingMechanismSetsTheModelSimulationParameters.
Settingthecontactforceparametersbetweenthejawandthedrillpipejoint:1.
Normalcontactforce:(1)Where:Generalizednormalcontactforce,N;stiffness):Collidingstiffnessonthesideofthecomponent;penetrationdepthPenetrationstiffnessinthecontactpoint,mm;(forceexponent):Forceindex,whichisalsothecontributionfactorofthestiffnessterm.
Force-Displacementcurveshapecanbedetermined.
:Maximumallowablepenetrationdepth,mm;damping)Maximumlossfactor,;2.
Tangentialforce-frictionThecontacttangentialforceistheproductofthefrictioncoefficientandthenormalforce,TheKunlunfrictionmodelisusedtodealwiththecontacttangentialforceinADAMS,Thefrictioncoefficientofcontactforceisinaccordancewiththerelativeslidingvelocitybetweenthecontactobjects.
Choiceofdynamicfrictioncoefficientorstaticfrictioncoefficient,Accordingtotheactualworkingconditionofthedrillpipejointandthejaw,Setting=0.
35,=0.
30.
SimulationDataOutputandAnalysis.
Inordertobeabletosimulationthehydrauliccylinderthrustintofoursymmetricaldistributionofthejaw,andeffectiveclampingofthedrillpipe,Setthesimulationtimeto110seconds,Setthenumberofsimulationstepsforthe11000step,SetthemaximumnumberofiterationsintheADAMS/solverto6,Theintegralpolynomialorderissetto2,Thiscaneffectivelyimprovethespeedandaccuracyofthecontactimpactforce.
ForceAnalysisoftheJaws.
ThecontactpressureinformationofthefourteethontheleftjawisshowninFig.
5andFig.
6;Fig.
5ContactpressureofthejawsFig.
6ContactpressureFromFig.
5wecanseethatthereisasequenceofcontactbetweenthefourteethontheleftjawandthesurfaceofdrillpipe,whatisinaccordancewiththeactual,Thecontactforceofeachtoothreachedtheirpeakvalueintheintervalof40secondsto50seconds,FNL11=125.
31KN,FNL12=228.
48KN,FNL13=264.
56KN.
Accordingtothecontactpressurestatediagram,Contactpressureoftheteethatthecenterofthehorizontallineisthelargest,whichclosestfromthehorizontallineistheleast.
Thishelpsincreasetherangeoftheclampingandbasicallymeetthedesignrequirements.
EatIntoTheDepthAnalysisOfTheJaws.
EatintothedepthofthedrillpipejointthatbitebyjawsintheprocessofMake-upisshownintheFig.
7,Combinedwiththesimulationcurvetoanalyzeeatintothedepth,Wecanseethebitedepthofeachteethgraduallyincreasedfromzerotomaximumvalues.
Andthenenterthestageofequilibriumandstability.
Hydraulicthrusttomaximumvaluein40secondsto50seconds,Bitedepthofthejawisgraduallyincreasedtothemaximum,Fig.
8.
Schematicdiagramofthejawsbitedepth,FollowingresultscanbeobtainedwiththecombinationofFig.
7andFig.
8,δL11=-0.
2541mm,δL12=-0.
3792mm,δL13=-0.
4182mm,δL14=-0.
1395mm.
Bitedepthvariationofthejawcanbeusedasfoundationofdrillpipejointsplasticdeformation.
Provideareferenceforjawsectionsizeoptimization.
Fig.
7EatintothedepthFig.
8SchematicdiagramofeatintothedepthKeyParametersOptimizationDesignoftheJawThroughtheanalysisofthejaws,weobtainedtherelationshipbetweenthekeyparametersandtheinfluenceonworkingconditionofthedevicewhenparametersvariation,abackclampdevicewithgoodperformanceshouldensurethatthedrillpipeandthejawmusthaveenoughfrictionco-efficient.
Toensurethattherewillbenoslipphenomenon,then,asfaraspossibletoensurethatthedamagetotheouterwallofthedrillpipeissmall,theorthogonalmethodisusedtooptimizethemainparametersofthejaw.
DesignVariable.
Inthispaper,thetoothheight,pitchandthreadangleofthethreecrosssectionparametersareoptimized.
ConstraintCondition.
Accordingtotheactualworkingbackgroundanddesignexperience,thelimitingconditions:threadangle80°~120°,spaceofthetooth2mm~8mm,toothheight~.
OptimizationIndexes.
Thepurposeofthisoptimizationistoselecttheoptimalvalueofeachparameterbycontrollingthedepthofbiteandtheequivalentfrictioncoefficient,Therearetwoaspectsoftheoptimizationindexes,Thebitedepth:,equivalentfrictioncoefficientThecombinationcanbeclassifiedtomulti-objectiveprogrammingproblem,Twoobjectivefunctionsareasfollows:(2)Withinacertainrange,thesmallervalueofthebitedepthfunction(2)is,thebettertheresultsare.
(3)Withinacertainrange,thebiggervalueoftheequivalentfrictioncoefficientfunction(3)is,thebettertheresultsare.
TheOptimizationDesign.
Optimizationofthemainparametersbyorthogonalmethod,comprehensiveconsiderationoftheoreticalanalysis,manufacturingrequirementsanddesignexperience,thedesignvariablesofthreadanglewereselectedas85,95,105,110,120,thetoothheightwereselectedas1.
5,2,2.
5,3,4,andvalueofthepitchwereselectedas3,4,5,6,8,selectstandardorthogonaltableL25(56),tablelinenumberofthetableis25,25testscanbecarriedout,tablecolumnnumberis6,upto6factorscanbeplaced,Thisstudydoesnotconsiderinteraction,Atotalofthreefactorsandfivelevelareinvolved,fromthestandardorthogonaltableL25(56),wecanseeoccupythreecolumnsandidlethreecolumns,ForintuitiveconveniencecanberecordedasL25(53),thelevelfactortableisshownbelow.
Tab.
1FactorlevelLevelFactorsAthreadangle((°)BToothheighth(mm)CPitchP(mm)1851.
532952431052.
55411036512048Aftercalculatingtheobjectivefunction,thestatisticaldataisneeded,inthispaper,wechoosetherangeanalysismethodtoprocessthedata,theresultanalysistableisshowinTab.
2,amongthem,KsisthesumofthefunctionresultsthatthelevelnumberineachcolumnoftheTab.
2forthes.
Inthispaper,s=1,2,3,4,5;ksisthearithmeticmeanvalueofthefunctionresultsthatthelevelnumberineachcolumnoftheTab.
2forthes.
ks=Ks/n,nisthenumberoflevels,n=5Ristherange,ineachcolumn,R=maxks-minks.
Tab.
2ResultanalysisEatintothedepthAthreadangleBtoothheighthCpitchPK13.
64152.
054.
8408K21.
5892.
66764.
9959K34.
13233.
58912.
9184K44.
72274.
96333.
2971K53.
96624.
78171.
9995k10.
72830.
410.
96816k20.
31780.
533520.
99918k30.
826460.
717820.
58368k40.
944540.
992660.
65942k50.
793240.
956340.
3999R0.
626740.
582660.
59928orderACBAthreadangleBtoothheighthCpitchPK14.
08043.
08725.
5713K24.
96263.
53454.
347K32.
50714.
46063.
7545K44.
87234.
32084.
1134K54.
41265.
59093.
1482k10.
816080.
617441.
11426k20.
992520.
70690.
8694k30.
501420.
892120.
7509k40.
974460.
864160.
82268k50.
882521.
118180.
62964R0.
44910.
500740.
48462orderBCAOptimizationResults.
Howtoco-ordinatevariousfactorswithlevelisthebest,thisoptimizationhastwoobjectivefunctions.
Forthebitedepth,thethreadangleisthemaininfluencingfactors,level110isthemostpreferred,Theoptimalcombinationparameter;andfortheequivalentfrictioncoefficient,themaininfluencingfactorsarethetoothheight,level2isthemostpreferred,Theoptimalcombinationparameter:,Accordingtotherequirementsoftheactualworkandtheoreticalanalysis,thedesignparametersofthefinaljawthat,sthebestoption.
FiniteElementAnalysisoftheJawToagreatextent,Strainandstressmagnitudeofthebackclampdevicethatunderstaticload,whatisaffectsthesafetyandreliabilityoftopdrivesystem,Therefore,itisnecessarytocheckthestrengthofthebackclamp,Themaximumstressandthetotaldeformationwereobserved,checkwhetherthedeviceisreliable.
AddModelMaterialProperties.
Thebacktongsmaterialselectionfor20CrMnTi,MaterialpropertiesareshowninTab.
3:Tab.
3Materialpropertiesof20CrMnTiAllowablestressMPaElasticmodulusEGPaDensityKg/m3Poisson'sratioYieldlimitMPa3102077.
81030.
25835DivideandRefinetheGrid.
Athreedimensionalmodelofthejawwasbuiltbythe3DsoftwareofInventor,exportthismodelintoANSYSworkbench,Addthematerialpropertiesofjawas20CrMnTi,andthemeshdivisionofjawisshowninFig.
9.
Fig.
9meshingofclampteethAddedloadanddidtheFEM.
Combinedwiththespecificsituationofthemodel,reasonableboundaryconditionsareaddedtoit,firstofall,toaddafixedconstrainttothebottomsurfaceoftheclamp,addtheloadtothefourteethofjaw,then,addtheappropriatesizeofcontactpressureandshearstressineachtooth,theloadsizeisprovidedbythesimulationresults.
Staticanalysisofthejaw,thecorrespondingstressdistributionanddeformationresultsareobtained,thetotaldeformationisshowninFig.
10,andtheequivalentstressisshowninFig.
11.
Fig.
10ContouroftotaldeformationFig.
11StresscontourofclampteethFromFig.
10andFig.
11wecanseethefollowingconclusions:Tab.
4FiniteelementanalysisresultscategoryminimumvalueMaximumvaluedisplacement00.
00845mmstress0.
31MPa411MPaThemaximumstressofjawis411Mpa,andtheyieldstressofjawis835Mpa,themaximumdisplacementofjawwas0.
00845mm,andthedeformationisrelativelysmall,sowecanconcludethatthestressanddeformationofjawaremeettherequirementsoftheuse.
ConclusionsThetheoreticalanalysisandoptimizationdesignofthebackclampdevicearecarriedout,weselectedthesectionparametersofthejaw,threadangle,thetoothheight,pitch,thisschemeensuresthattheequipmentworkprocessreliable,reducesthewearofjawsandthedamagetothedrill,prolongtheservicelifeoftheequipmentaswell.
Staticsanalysisofthejaws,themaximumstressanddeformationshowsthatjawsstrengthmeetstheapplicationrequirements;clampingprocessofthedeviceisstableandreliable.
AcknowledgementThisworkispartiallysupportedbygrantSinoProbe-09-05oftheChineseNationalScienceFoundation,andmysinceregratitudegoestoit.
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