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1、第31卷第4期航空学报Vol31No42010年4月ACTAAERONAUTICAETASTRONAUTICASINICAApr.2010文章编号:10006893(2010)0408650622MnB5超高强钢板热成形中的回弹机理分析11112刘红生,包军,邢忠文,宋宝玉,杨玉英(1哈尔滨工业大学机电工程学院,黑龙江哈尔滨150001)(2哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001)AnalysisofMechanismofSpringbackin22Mn
2、B5SuperhighStrengthSteelForming11112LiuHongsheng,BaoJun,XingZhongwen,SongBaoyu,YangYuying(1CollegeofMechatronicsEngineering,HarbinInstituteofTechnology,Harbin150001,China)(2SchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001,C
3、hina)摘要:回弹是影响热冲压件形状精度的主要因素,为研究影响22MnB5超高强钢板热冲压成形中回弹的因素,在不同温度下对22MnB5高强钢板进行拉伸试验,考察了变形温度和应变速率对弹性应变和蠕变应变的影响,获得其热力学性能。通过等温度和非等试验考察了变形温度、热成形终了温度和压边对热成形后回弹的影响。采用有限元法对槽形件非等温热成形过程进行了数值模拟。从试验结果和模拟结果可知,热效应是引起回弹的主要因素,蠕变应变减少了热成形后的回弹量。蠕变应变和热效应是影响热成形中回弹的主要因素。关键词:蠕变;有限元方法;
4、数值模拟;高强钢;热冲压;回弹中图分类号:V2613;TG306文献标识码:AAbstract:Largeamountofspringbackisoneofthemajorproblemsinvolvedinthehotformingofsuperhighstrengthsteelsheets.Inordertoinvestigatethemechanismofthespringbackafterthehotformingofsuperhighstrengthsteelsheetmetal22MnB5
5、,thethermomechanicalpropertiesofthematerialmustbedetermined.Tensiletestsinanelevatedtemperaturerangeareconducted,aimingatobtainingthethermomechanicalpropertiesof22MnB5sheetmetal.Theeffectsofdeformationtemperatureandstrainrateonelasticstrainandcreepstrainar
6、eexaminedthroughhottensiletests.Theinfluencesonspringbackofdeformationtemperatureandtemperatureattheendofformingareinvestigatedthroughisothermalandnonisothermalformingtests.Finiteelementnumericalsimulationsofhotformingforchannelshapedpartsareimplemented.Itca
7、nbeconcludedfromtheexperimentalresultsandnumericalresultsthattheheateffectresultingfromdifferentcoolingratesisthemainfactoraffectingthespringback,whilecreepstrainreducestheelasticreversion,thusreducingthespringback.Creepstrainandheateffectarethemainfactorsin
8、fluencingthespringback.Keywords:creep;finiteelementmethod;numericalsimulation;superhighstrengthsteel;hotstamping;springback未来军事战机的主要发展趋势是高机动性、用寿命,成形后产生的回弹量大,不易控制成形件[3]超声速巡航,如战机F22就满足了该
