基于dynaform的汽车防撞梁拉延工艺参数影响规律研究

天津职业技术师范大学TianjinUniversityofTechnologyandEducation毕业论文专业：材料成型及控制工程班级学号：学生姓名：指导教师：二〇一三年六月基于dynaform的汽车防撞梁拉延工艺参数影响规律研究Studyondrawinginfluenceparametersforbumperbeambasedondynaform专业班级：学生姓名：指导教师：系别：机械工程学院2013年6月摘要汽车覆盖件模具是汽车制造业的重要工艺装备。汽车覆盖件有限元分析可以有效提高设计和生产效率以及结果的准确率。本文研究基于有限元分析软件对某车型防撞梁的拉延过程进行了仿真分析，确定了拉延参数。论文从制件网格划分，模型材料选择，拉延工艺参数选择等几个方面，通过进行前处理过程，将拉延模拟需要的各参数输入，然后在后处理中对结果进行分析比较，了解各种参数对成形结果的影响，然后提出改良措施。结果表明，由于压边力的逐渐变大，零件的回弹量也随之减小，当压边力过大时，零件出现了破裂的成形缺陷。同时由于压力的逐渐增加，材料的流动阻力也随之增大，继而使得各部分的塑性变形变大，导致回弹量较小。板料的尺寸增量延Y轴的正向偏移量变大则靠近Y轴正方向的一侧的回弹量呈现变小的规律，Y轴负方向偏移量越大靠近Y轴负方向的回弹量也呈现减小的规律。延X轴方向对称增加值变大，回弹量大致上呈现变小的规律。论文的研究成果对提高汽车覆盖件的成形质量和模具生产周期具有一定的实际价值。关键词：汽车覆盖件；拉延成形；防撞梁；数值仿真ABSTRACTTheautocoverfiniteelementanalysisoftheroleofthekeyistoimprovethedesignandproductionefficiency,aswellastheaccuracyoftheresults.ThisarticleisbasedonthefiniteelementanalysissoftwareDynaformdrawingprocesssimulationanalysistodeterminethepaneldrawingparameters.ApplicationofsheetmetalformingfiniteelementsoftwareDynaform5.7ofcarcrashbeamdrawing,forexample,fromtheaspectsofthemeshmodelmaterialselection,drawingprocessparametersselectionbypre-treatmentprocess,willpullextensionofsimulationrequireseachparameterinput,andtheninthepost-processingtoanalyzetheresultscomparedtotheunderstandingoftheinfluenceofvariousparametersontheformingresults,thenproposedimprovedmeasures,torepeatthemodificationofthepre-treatmentprocessparameters,theanalysisagain,inordertoSumminguptheinfluenceofvariousparametersontheresultsofthedrawing.Forexample,fromtheblankholderforcesize,punchingspeed,pullthebeadeachchangemultiplesetsofdata,followedbythedrawingoperationissetfromthepost-processingtomodifytheparametersofsimulationresults,comparingthedrawingparameterschangedrawingresultswereinvestigated.Dosocanbefoundthattheproblemsthatmayariseinthemanufacturingprocessatthedesignstageandsolvethemanufacturingmoldcanbeefficientlyandeconomically,improvepartquality.KeyWords：Autocover;drawing;bumperbeams;simulationI目录1绪论..............................................................................................................................11.1我国汽车覆盖件模具发展现状........................................................................11.2汽车覆盖件CAE分析国内外发展现状............................................................11.3课题的研究内容与技术路线............................................................................32有限元计算相关理论...................................................................................................52.1引言....................................................................................................................52.2计算的相关理论................................................................................................52.2.1冲压回弹模拟的有限元理论基础..........................................................52.2.2板料冲压仿真的流程..............................................................................62.2.3单元类型的选择......................................................................................62.2.4边界条件的处理......................................................................................72.3小结....................................................................................................................93板料拉延过程的有限元分析....................................................................................103.1引言..................................................................................................................103.2前处理..............................................................................................................113.2.1数据导入与网格化分.............................................................................113.2.2工具与工序定义.....................................................................................203.2.3控制成形参数设置.................................................................................263.3提交计算..........................................................................................................273.4结果后处理及分析..........................................................................................283.5小结..................................................................................................................334板料回弹的数值模拟................................................................................................344.1引言.................................................................................................................344.2回弹分析.........................................................................................................344.3回弹数值模拟前处理.....................................................................................354.3.1导入模型进行回弹分析........................................................................354.3.2导入成形零件边线................................................................................354.3.3回弹分析设置........................................................................................374.4提交计算.........................................................................................................39II4.5回弹计算结果处理及分析............