难成形曲面零件的电磁辅助成形模拟研究

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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