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ID:36375273
大小:3.51 MB
页数:60页
时间:2019-05-10
《难成形曲面零件的电磁辅助成形模拟研究》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、武汉理工大学硕士学位论文难成形曲面零件的电磁辅助成形模拟研究姓名:陈石申请学位级别:硕士专业:材料学指导教师:黄尚宇20100501AbstractInrecentyears,therapiddevelopmentofautomobileindustryhasbroughtincreasinglyseriousenvironmentalandenergyissues.Inordertoeffectivelyreducepollutionandenergyconsumption,lightwei班tmaterialsandstructur
2、esbecomethemaintrendofmodems白mcturaldesign.Thelightweightmetalmateriallikealuminumhasbeenusedwidelyintheadvancedmanufacturingfield.However,therearemanyproblemsduringthealuminumalloyformingprocess,suchasitisdifficulttocontrolmaterialflow,theplate’Sstressandstrainaredistri
3、butedunevenly,springbackandtheformingprecisionisdifficulttocontrol,andSOon.Therefore,theformingqualityhasbecomeamajorobstacleforaluminumalloysheetbeusedinElectromagneticforming(EMF)isakindofhighvelocityformingtechnique,thiscanacceleratethesheettovelocitiesontheorderof200
4、m.s。1overadistanceofafewmillimeters.Thishighvelocityformingcanbequitebeneficial.ItCanimproveformabilityandstraindistribution,reducethespringblackofthealuminumalloys.Comparedwiththetraditionalspringbackcontrollingmethods,EMFmakethecurvedworkpiecebecalibratedbyfittingtothe
5、femaledie,throughadjustingtheelectromagneticforcetoremovespringback,itiseasiertodecreasethespringbackviathismethod.Inthispaper,finiteelementanalysissoftwareANSYSisusedtodiscussthesurfacecoil’Smagneticfieldofelectromagneticproperties.Simulatethedischargecircuitandfindthev
6、ariationthatthecurrentofsurfacecoilchangeswiththetime;Simulatethemagneticfieldofthesurfacecoil’Selectromagneticformingandfindthedistributionofmagneticfieldandmagneticfieldstrengthofthesurfacecoil.MagneticdeformationprocessofsheetmaterialsurfacepartssimulatedwiththeFEAsof
7、twareDynaform.Theresultindicatesthat:1)Theformingeffectisdecidedbythespacingbetweenthesheetanddie.Theresultsshowthatthedistancebetweensheetmetalanddieincreases,thedeformationoftheworkpieceafterformingreducesandspringbackincreases.2)Witlltheincreaseofdischargeenergy。thema
8、gneticpressureactingonthesheetmetalsurfaceincreases,andthepostsmodularisbetter.3)Formedunderthesameener
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