第卷第期材料科学与工艺21摇1摇摇摇摇摇摇Vol.21No.1年月摇摇20132MATERIALSSCIENCE&TECHNOLOGYFeb.,2013摇摇摇摇摇摇基于田口方法齿圈压板精冲模具参数优化丁日显1,郭成1,张缓缓1,陈维2摇摇西安交通大学机械工程学院西安西北工业集团有限公司西安(1.,710049;2.,710043)摘要:在精密冲裁过程中,精冲模具结构参数和板料的摩擦系数显著影响精冲剪切面质量采用有限元模摇.拟和田口方法,对齿圈压板精冲模具精冲黄铜板料过程中凹模圆角半径、形齿齿高、形齿齿边距和H62VV板料摩擦系数对剪切面撕裂比的影响进行了研究结果表明:参数按照减小撕裂比能力由大到小排序依次是.凹模圆角半径,形齿齿高,板料模具摩擦系数和形齿齿边距研究发现:采用优化参数可显著减小剪V-V.切面上撕裂比,撕裂比最大减小,并可抑制凹模刃口附近微裂纹萌生,使剪切带内裂纹由凸模单向扩24.8%展至凹模刃口,避免裂纹的双向扩展贯通导致较大撕裂比剪切面的出现-.关键词:精密冲裁;田口方法;有限元模拟;撕裂比;黄铜;裂纹扩展H62中图分类号:文献标志码:文章编号:TG386A1005-0299(2013)01-0092-05Optimizationofparametersoffine鄄blankingdiebasedontheTaguchimethod1112DINGRi鄄xian,GUOCheng,ZHANGHuan鄄huan,CHENWei(1.SchoolofMechanicalEngineering,Xi忆anJiaotongUniversity,Xi忆an710049,China;2.CNGCNorthwestIndustriesGroupCo.,LTD,Xi忆an710043,China)Abstract:Infine鄄blankingprocess,structuralparametersoffine鄄blankingdieandfrictioncoefficientofthesheetsignificantlyinfluencetheedgequalityofthefine鄄blankedpart.FEMsimulationwithTaguchimethodwascarriedouttoinvestigatetheinfluenceofthefine鄄blankingparameters(i.e.,dieradius,Vindenterheightandposition,coefficientoffrictionofthesheet)onthecrackratioofthefine鄄blankedsurfaceintheprocessoffine鄄blankingH62brassplate.Theresultsindicatethatthedescendingorderofimportanceoftheparametersisthedieradius,theV鄄ringindenterheight,thecoefficientoffrictionandtheV鄄ringindenterposition.Themaximumreductionofcrackratiowasabout24.8%usingthefine鄄blankingdiewiththeoptimizationparameters,whichcouldsuppressthenucleationofmicro鄄cracknearthedieradiusandmadethecrackpropagatedfromthepunchsidetothedieside.Crackcoalescencewasavoidedintheshearingzoneinthepunchingprocessbe鄄causeofthereductionofthecrackratioonthefine鄄blankingsurface.Keywords:fine鄄blankingprocess;Taguchimethod;FEMsimulation;crackratio;H62brass;crackpropagation精冲作为一种先进材料分离技术能以低成点如使用压边圈形齿冲裁间隙小凹模圆角摇摇,,、V、、本和极少的加工工序生产出高品质零件[1]与常半径较大等精冲零件剪切面质量的主要评价标..规冲裁相比精冲零件具有尺寸精度平整度和剪准是剪切面上的撕裂比[3]即撕裂带宽度与剪切,、,切面光洁度更高垂直度更好[2]的优点广泛用面宽度的比值如图所示在最近几年的研究、,,1