激光拼焊板沖壓成形焊縫移植規(guī)律及成形性能研究.pdf

1、哈爾濱理工大學(xué)碩士學(xué)位論文激光拼焊板沖壓成形焊縫移植規(guī)律及成形性能研究姓名：秦海斌申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：@指導(dǎo)教師：劉曉晶201103喻爾演理T人學(xué)T學(xué)碩l!學(xué)位論文eLawofⅥ，eldMovementandFormmgPropertiesintheDrawingProcessofLaserTailorWeldBlanksAbstractTailorWeldedBlanks(TWBs)isanewcompositesheetcomp

2、osedoftwoormoresheetswithdifferentthickness，materialpropertiesorsurfacecoatingsbythewayofweldingItcansatisfythedifferentserviceperformancerequirementsofthedifferentpansLaserweldingischosentoproduceTWBs，becausethelaserwel

3、dingspeedisquick，theweldisnarrowandthedamagetobasemetalissmallWiththerequirementsofautomobiledrivingsafetyenergyconservationandenvironmentalprotectionareincreasinginthesocietymoreandmoreattentionhasbeenfocusedonthetechno

4、logyofTWBsButthebasemetalofTWBsisdifferentinmechanicalpropertiesandthickness，andithasweld，SOtheTWBsismoreeasilytowrinkle，ruptureandspringback，andthereisalsotheweldmovementproblemcomparedwithtraditionalsheetSoitisveryimpo

5、rtanttesearchthestampingpropertiesofTWBsAccordingtothetypicalsquareboxoflaserTWBs，thisarticlehasdonesomenumericalsimulationresearchbyusingofthefiniteelementanalysissoftwareDYNAFORMAtthetimeoflaserTWBssheetmodeling，select

6、rigidconnectiontomodelweld，neglecttheweldtypeandthepropertyofheataffectedzone(HAZ)，itcannotonlysimulatethepracticalstampingprocessoflaserTWBspansaccuratelybythiswaybutthetreatmentisalsorelativelysimpleStudyfoundthatthewe

7、ldmovement1awsofsquareboxareasfollows：theweldoftheboxbottomintegrallyoffsetstothethicksheet，theweldofsidewallandflangegraduallyoffsetstothethinsheet，theclosertotheouteredgethegreateroffsetoftheweldIncreasingtheproportion