链条滚子反挤压刚粘塑性有限元模拟研究

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1、链条滚予反挤压刚粘塑性有限嚣模拟研究摘要零文缝会谖题“链条滚子糖密戏影工艺及攥吴浚诗”，袋怒剐搴鑫鳖

2、筵骞疆嚣法对滚予残形皆豹关键工露爱揍匿避黪数藏摸数，磐瓣数毽搂羧避稷串熬～黧关键阏题遴褥了较梵系统数磺究。铮对糕黧性材料霞实黪蔽形过摆巾熬特点，驳宾汉滚动壤型兔基稿，建巍了撵糙塑性枣孝料、刚糖塑镌孝考料的本槐方程；劳钵瓣不丽誊砉精在不同条l牛下糖性系数豹获取阕题绘出了有效的方法。测趱鹗函数法擦导爨蠼蓬熬霄羧元诗冀剐式，便于编援鞠计算。从而鳃决了剐粘塑性有限露法核一心间题。程实施模拟的过程中，辩～些

3、关键闯题进行了肖散鹃鲶爨，翔耪始速度蝎的获取、奇笄点的处理、迭代的收敛判据等；尤其蹩湖格爨划阅憨，{乍者进行了较为详缨麴磷究，弗借赘有限元获释豹嘲格自动霆翔功能辩滚予发挤压过獠中的耐格重划阎越避行处理。穰擐模獗缩采辩爱挤歪避稚孛金耩静流动瓶穆邂{亍分耩翻研究，飘丽为会疆竣计模其鞠工艺参数雒供依罐。通过模藏预溺产黼W能产生的缺陷，根据金属簌波形遂羧串豹滚动蕊律，爨出了一耱改避静精密袋形工艺方秦。矮纛，本文避符了察验研究，验谈了链条滚子猎密成形工芑方案的可行憋移数蠖模羧戆帮靠毪。关键溃：数德i撼剐糕塑

4、健{隔元法链条2女孚。菠赛瑟关键溃：数德模拟剐糕塑健褥限元法链条2建譬菠揍毯AStudyofRigid--ViseoplasticFiniteElementSimulationofChainRoller’SBackwardExtrusionProcessAbstractThisthesis，combinedwithproject"thepreciseformingtechnologyanddiedesignofchainroller",USeSrigid-viscoplasticfiniteele

5、mentmethodtonumericallysimulatethekeyprocessnamelybackwardextrusioninrollerforming，andsystematicresearchhasbeendoneonsomekeyquestionsduringtheprocessofnumericalsimulation．Directlyfocusedonthecharacterofviscoplastiematerialduringpracticalformingprocess

6、，basedOnBingham’8model，theconstitutiveequationsofelastic-viscoplastiematerialandrigid—viscoplastiematerialhavebeenestablished；aneffectivemethodhasbeenproposedtogettheviscouscoefficientofdifferentmaterialundervariousconditions，andstandardfiniteelementc

7、alculatingformulahasbeendeducedthroughpunishmentfunctiontomakeprogrammingandcalculationconvenient。Therefore，theCOrequestionofrigid—viscoplastiefiniteelementmethodhasbeensolved。Duringtheprocessofsimulation，somecriticalquestionshavebeeneffectivelymanage

8、d，suchasacquiringtheoriginalveloeityfield、handlingwithsingularpointandjudgingconvergenceofiterationetc。Especiallyastotheproblemofre-mesh，thewriterdoesadetailedresearch，andhandlestheproblemof羚·meshinrollerbackwardextrusionwiththeaidofauto。meshfunctiono

9、ffiniteelementsoftware．Basedontheresultsofsimulation，analysisandresearchhavebeendonetothemetalflowlawduringbackwardextrusion，whichofferbasis协reasonabledesignofdieandtechnologicalparameter．Predictthepossibledefectsofproductionbysimulation，andsu