资源描述：
《27simn液压支架管轧制变形过程数值模拟研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、内蒙古科技大学硕士学位论文Abstract27SiMnhydraulicsupporttubecanbeusedtoproduceimportantseamlesssteeltubes,suchashydraulicsupport,automobilecrane’shydrauliccylinderandpistonformining.Thispaperexploresthedeformationrulesofpiecingandrollingoftubes,andthefeasibilityof27SiMnseamlesssteeltube(114×10)withc
2、ertainplant’sbacterium-stylepuncherofAsseltuberollerunit(Φ100)astheresearchobjectandtheSimufactnonlinearfiniteelementsoftwareastool,basedontherollingprocessofAsseltuberoller.ThisstudylaystheoreticalfoundationforoptimizationofAsselrollingprocess.3DFEMmodelforthebacteria-typepiercingdefor
3、mationprocessisestablishedforsimulationofvariationrulesofworkpiecepiercingprocess;thestressstraincurveof27SiMnsteelisdeterminedbythermalsimulationmachineGleeble-1500D,andthesimulationresultsshowthatthefeedangleis10°,thetubeblankcanmoveinspiralmannerinthemetalcavityformedbytherollandguid
4、ingplate,anditsvelocityisabout710.373mm/s;themaximumequivalentstress(103.676MPa)oftube’sexternalsurfaceoccursintheareabridgingtubeblankandtherollandguidingplate,andthat(102.3MPa)ofthetube’sinnersurfaceoccursintheareabridgingthetubeblankandtheheadtip;withtheincreaseoffeedanglefrom9°,10°t
5、o11°,therollingforce,theaxialforceofheadtipandthelateralpressureonguidingplateincrease,thedeviationofwallthicknessandouterdiameteralsoincreases,buttheexternaldiameterovalitydecreases.3DFEMmodelofsteeltube’srollingdeformationisestablishedtosimulatethechangesoftuberollingprocess,andtheres
6、ultsindicatethatthemaximumequivalentstressoftube’sexternalsurface(130.14MPa)anditsinnersurface(128.4MPa)occursinthewall-decliningareaandreelingarea.Inthewholerollingprocess,thedistributionofequivalentstressalwayschangesperiodically,andtheequivalentstressbetweenadjacentrollersalwaysdecli
7、nesfromtherollerbottom(i.e.theareabetweenrollerandcapillary)torollgap,thenslightlyincreases,thendecreases,andfinallyreachesitsmaximuminnextrollerbottom;themaximumvalueisII内蒙古科技大学硕士学位论文129.177MPa,andtheminimumvalueis93.36MPa.Withtheincreaseoffeedanglefrom4°,5°to6°,therollingforc
