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基于图像技术的电阻点焊电极对中性检测系统.docx

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基于图像技术的电阻点焊电极对中性检测系统 Abstract Inresistancespotwelding,theneutralpoint(NP)isanimportantparameterthataffectsthequalityoftheweld.Inthispaper,aneutralpointdetectionsystembasedonimagetechnologyforresistancespotweldingelectrodesisproposed.Thesystemiscomposedofacamera,animageprocessingunit,andacontrolunit.TheimageprocessingunitdetectsthepositionoftheweldnuggetandcalculatestheNP.ThecontrolunitadjuststheweldparametersbasedontheNPvaluetoensureabetterweldquality.TheexperimentalresultsshowthattheproposedsystemcanaccuratelydetecttheNPandimprovetheweldquality. Introduction Resistancespotwelding(RSW)isacommonlyusedweldingtechnique,whichiswidelyusedinautomobileandaerospaceindustries.ThegoalofRSWistobondtwometalpartstogetherbyheatingthemtothemeltingpointusingaconcentratedelectricalcurrent.Thequalityofthewelddependsonseveralparameters,includingtheweldingcurrent,theweldingtime,andtheelectrodeforce.Oneofthemostcriticalparametersistheneutralpoint(NP). TheNPisthepointwherethecurrentdensityiszero,andtheheatgeneratedbythecurrentisthelowest.Inotherwords,theNPisthepointwherethetwometalpartsareindirectcontactwitheachother.ThelocationoftheNPisaffectedbyseveralfactors,suchasthethicknessofthemetalparts,theelectrodegeometry,andthesurfaceconditionofthemetalparts. Traditionally,thelocationoftheNPisdeterminedbymeasuringthecurrentwaveform.However,thismethodhasseverallimitations,suchasthecomplexityofthemeasurementsetupandthesensitivityofthemeasurementtotheelectrodewear.Toovercometheselimitations,anewtechniquebasedonimagetechnologyforNPdetectionhasbeenproposed. Inthispaper,aneutralpointdetectionsystembasedonimagetechnologyforresistancespotweldingelectrodesisproposed.Thesystemusesacameratocapturetheimageoftheweldnuggetduringtheweldingprocess.TheimageprocessingunitdetectsthepositionoftheweldnuggetandcalculatestheNP.ThecontrolunitadjuststheweldparametersbasedontheNPvaluetoensureabetterweldquality. Systemdesign Theproposedsystemconsistsofthreemainmodules:thecameramodule,theimageprocessingmodule,andthecontr