類型材彎曲展開長度及回彈角工程計算方法研究.pdf

1、Y939jID3分類ojTG382密緞：巾似代碼：ⅢO㈣’‘產(chǎn)oj：弋目差≮夭等學(xué)位論文類型材彎曲展開長度及回彈角工程計算方法研究Thestudyforcalculationmethodsinengineeringofshapedsteelalikebending’Slengthunfoldingandspring—backangle研究生：盟全武指導(dǎo)教師：塞』宜苤副熬攫合作指導(dǎo)教師：到推進(jìn)應(yīng)崩訝究縣申請學(xué)位門類級刖：；!：狴亟專業(yè)名稱

2、：盤、業(yè)：』：程研究方向：撾抖地』所任學(xué)院：工蘭【盜2006年3j】11ljAbstractThistaskissetUshapedpartasanexampleinordertodiscusstherelationshipsbetweentheunfoldingOftheunplannedclassbendingsuchasangelsteelalike，channelsteelalike，etc，andthelevelofbendi

3、ngthetechnologicalprojectofthestampingandthestructureofthedie，and∞astogettheformulafordesigningbydeductingintheoryandtheexperiencing1、whcDthelevelofbendingissmaller(R／H=10)thestrainneutrallayeriscoincidencetothebendingce

4、nterlocusoftheworkblanksection，1eInⅡovc施glrbi唧咄，wemm山efom山，L——(R—b弋Z麗oX—180一。／0h一衄曲岫咄wecanusetbe如mulaL=等嘉學(xué)zo—g，一(1竺2二生二蘭墾：14，I衛(wèi)22aR2莉燦2笨黼2、Whenthelevelofbendingisbigger(R／H10)the硝ninneutrallayerdoesn’tthrouIghthecenterof

5、gravityoftheworkblanksecdOUandlttOVcinsideTheneutrallayermovingcoefficientofthisclassbendingzcanbereplacedbytheconespondencemovingcoefficientoftheplaneclassbendingxthat啪befoundoutbyusingthevalueofR／HOrR／(2Zo)So，Introvert

6、ingarbitroyan#e，wc啪峨lhe脅llIaL—#(R—面2Z廣ox)ah舯Iting岫；唧Inglcwectnusethefo他咄工坐塑等躲避3、、^(hgQ眥wanttocalculatetheunfoldinglengthofthe吐●弘msteel池bendingthatusingtheprojOCtflangingfi巧tandthenbendingweshouldbeintermsofthemedianpoint

7、gaugeasthepositionofthcneutrallayerFustcalculatingthevalueofR／H；secoedcalculatingthelengthusingthecorrespondenceformulaschoiceby‘hcvalueofthebendinglevelWhcnwewanttOcalculatetheunfoldingleagthoftheshapedsteelalikebending

8、thatusingtheactbendingfirstandthennanglngweshoulduscthemethodoftheplanebendingunfoldingButwhenwedecidethepositionoftheneutrallayeGweshouldconsidertherelationshipwiththelevelofbending，ie，consideringthedifferentmethodsbetw

9、eenRA=5andR／t54、Ifthediestructurehasnottheswageset，thetechnologicalpmjectofthestampingisflanging，bendingsoweshouldcalculatethelengthusingthemethodofthepmjectflangingfirstandthenbendingIfthediestructurehastheswagesetthete