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1、上海交通大学硕士学位论文无余量弯管工艺研究姓名：邹双桂申请学位级别：硕士专业：船舶及海洋工程指导教师：唐文勇;麦荣枝20080901上海交通大学工程硕士学位论文摘要(2)回弹角度会随着管壁厚度增大而减小，随着弯曲半径的减小而减小，而其回弹半径会随着管壁厚度增大或弯曲半径减小而减小；(3)管材的屈服点越高，则回弹越小；(4)为达到设计的管子弯曲半径，弯模半径可适当减小，约为设计弯曲半径的0.95~0.98，其取值大小与弯管机有直接的关系，实际弯管时可根据前面提供的各弯管机线性回归关系式来进行。(5)管子弯曲成形卸载后伸长量的构成包
2、括由于弯曲部分弹塑性变形引起的成分和由于直管段的塑性变形引起的成分。(6)Φ42mm及以下采用无芯弯管，在弯制过程中绝大多数伸长量为5mm左右，在加工管子制作的公差范围内，可忽略由于弯管而产生的伸长量。(7)对Φ42mm以上的采用有芯弯管，其伸长量可利用试验回归图表。关键词：无余量弯管，回弹量，伸长量，工艺研究第II页上海交通大学工程硕士学位论文ABSTRACTASTUDYONSPRINGBACKANDLENGTHEXTENSIONOFPIPEBENDINGABSTRACTSpringbackandlengthextension
3、arethemostimportantfactorsinfluencingtheformingqualityofbendingpipe.Inthispaper,inordertoimprovethequalityinaccuratepipebending,thetheoriesofelasticdeformationandplasticdeformationarestudiedandlargeamountoftesthavebeencarriedout.Basedontheabovepredictingofspringbacka
4、ndlengthextensionpreciselyarethekeytoobtainingtheaccuracyofbendingpipe.Itisdifficultfordesignengineerstopredictspringbackandlengthextensionbecausemanyvariablesaffectit,suchasmaterialproperties,diegeometry,pipeouterdiameter,pipethickness,andsoon.Inthispaper,therearema
5、nyrecordscontainingthespringbackandextensionpropertiesofvariouspipematerialsandpipesizesatdifferentanglesofbend.However,thesmallerthebendingradiusare,thesmallerthespringback,andthegreaterthebendingangel,thegreaterthespringback.Thefinalbendingangleafterspringbackissma
6、llerthanthatbeforespringback,andthefinalbendingradiusafterspringbackislargerthanthatbeforespringback.Inordertoachievetheaccuratebendingangleastargetfigure,forpracticalpurposestheactualbendingdieradiusmaybesmallerthanthetargetradius,i.e.about97%,andtheactualangleofben
7、dingforthecertaindieisslightlylargerthanthedesiredanglebasedonthepipesizeandwallthicknessanddesiredangle.Onthebasisofbendingexperimentswithvariouspipesizeclassed,variouswallthicknessesandanglesofbend,lengthextensioninformationrecordedinthispaperarecreated,andthepipei
8、sbentaccordingtothecreatedbendinginstructions.Keywords:Pipebending,springback,lengthextension,technicalstudy第III页上海交通大学学位论文原创性声明本人郑
