點(diǎn)焊拼接板沖壓成形性能的理論分析.pdf

1、西北工業(yè)大學(xué)碩士學(xué)位論文點(diǎn)焊拼接板沖壓成形性能的理論分析姓名：宛瓊申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：李付國20050301西北工業(yè)大學(xué)碩士學(xué)位論文AbstractTheemergingoftheTWB(Tailoredweldedblank)technologyhasbroughtarevolutionaryreformtothedesignandmanufactureofvehiclebody.Ithasbrokenthr

2、oughthetraditionalideathatailpartsofthevehiclebodyaremadeofthesamekindofblank.Spotweldingtailoredblankonekindoftailoredweldedblankiscomprisedofmetalsheetswithvariousspecificationmaterialanddimensionthatareweldedbysplicin

3、gmethodorjoiningmethod.Andthestampingpartsthathavebeenoptimizedinshapestrengthandweightcanbeacquiredviatheblankstampedconsequently.ComparedwithotherkindsofTWBstheapplicationofspotweldingtailoredblankhasmanyadvantagessuch

4、ashighefficiencyandlowcostetc.Inthispaperthespotweldingtailoredblankmadeofgeneralvehiclebodysheetsistheresearchsubject.Theformingcapabilityofspotweldingtailoredblankissystematicallystudiedbyintegratingtestmethodandtheore

5、ticalanalysisinharmonyandcomparedwithnumericalsimulationresult.Themainfruitsandnewideasareasfollowing:1.Thetestingresultsindicates:(1)Duringtheshapingofspotweldingtailoredblankthedistortionismainlycontributedbythebasemet

6、al.Thedistortionofweldingspotsiscomparativelylesser.Thenuggetoftheweldingspotsishardtodistortespecially.(2)Thespotweldingtailoredblankshowscompatibilityofformabilitygenerally.Onlythelocaldistortionoftheblankisaffectedbyw

7、eldingspots.Theformingofthewholeblankisrarelyinfluencedbythem.(3)Thetotalelongationofspotweldingtailoredblankisbelowthetotalelongationofthebasemetal.Butduringthesmoothtensilestagebeforetensilebucklingtheelongationofthebl

8、ankiscorrespondtothebasemetal.2.Thedistributionofstressaroundtheweldingspotisobtainedbyadoptingstressfunction.ThestresswhichcanmaketheplasticallydeformingareaappeararoundtheweldingspotisdeterminedonthebaseofSwiftHillyiel

9、dcriterion.Thestrainsofspotsonthetensileaxisareacquiredbyuseofsinglecurveassumption.Thecomparisonbetweenthetheoreticalresultandnumericalsimulationresultindicatesthetheoreticalcalculationmethodisonlyappliedtosmallelasticp