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纯铜电极精铸数值模拟分析
发布时间:2021-01-01 05:46    文章作者:世界十大赌场排行榜

  图预测铸件缺陷,优化出最佳工艺方案 ,幵进行实际验证 基于最优工艺方案,生产出合格铸件 56MS/m, ,数值仿真技术在铸造工艺 ,应采用精密铸造生产纯铜电 道当量热节囿直径Dg=kDc 1.1~1.2Dg =0.930.46=27.41mm。 =589.35mm 15mm,由 a=39.3mm ,取b=40 mm Ds1.15Dg=31.52 mm,故 Ds=35mm。 80mm,直 80mm。 浇注系统设计 54.28MS 1.2.2由图1可知,铸件中 位置都有热节,都要安放冒口。根据铸件被补缩部位的热节囿直径,确定冒口的结构 尺寸 DA=30.46 DB=28 DA=21.32 HrA =76.15 HB=3DB=19.6 HrB=61.6 4~10D1 D1=0.7D,HA=2.5D。 18mm,取 108mm 345mm :2010-08-20;修改稿收到日期:2010-09-25 :,E-mail :gsguo@yahoo. com.cn 56 纯铜电极精铸数值模拟分析 缺陷成因分析的正确性 12003.8 25 cm-3 )(kJkg -1 -1254.34mm,冒 8.960.39 1.7710 -6 396.4 1083 890 为了得到比较准确的模拟结果,模拟时采用较小的网 格划分,以保证浇注系统每个薄厚处都能有单元划分。 ,引起缩孔及弥散型气孔等缺陷 3a,图3b (a)6.5s时的铸件固相率云图(b)7.0s时的铸件固相率云图 ,随温度下降溶解度减少,过饱和气体从铜液中析出形成气泡,在 铸件凝固前未能上浮逸出而形成弥散性气孔。铸件上方 的冒口尺寸较小,丌足以补充铸件的收缩,从而在铸件上 )的热节位置由于无冒口进行补缩,由此在铸件内部也产生了缩孔 凝固后的缺陷预测图 ,因此无法对底部57 特种铸造及有色合金 2011 结果作为纯铜电极的浇注系统 56MS/m,满 11纯铜电极铸件剖面图不局部图 改进方案不措施 见图2。出气孔改为独立竖直向上。修改后模型见图8。为验证修改 陷、缩孔等基本都进入到冒口中。而丏经过 ProCAST 缺陷量调整表明,缺陷值都 在0.01%左右,缺陷量较小,说明此种浇注系统是合理的。 56MS/m,大 算机模拟在铝合金半固态压铸中的 用[J].特种铸造及有色合金,2006,26(7):2-3. A,KAMKINRI.Mathematicalmodelofbehaviorof impuritiesundertheconditionsofreducingbubbleprocessingofco- ppersmeltingslags[J].Metallu-RgyofNonferrous Metals,2010, 51(1):26-31. ,2005,54(1):9-12. :机械工业出版社,2003. :机械工业出版社,2002. ,目前已达到年产1.2 (a)6.5s时的铸件固相率云图(b)7.0s时的铸件固相率云图 7.0s时铸件的固相率云图58 50AbstractNewfully-hydrauliclockingdevicewithwide- lyusingrangeanddesirablelockingeffectswaspres- ented basedonanalyzingloc-kingdevicemechanismathomeandabroad.ThePro/ Esoftware wasusedto modelthe mechanism andto calculatedisplacementtoensurethedevicetomeetthe requirementsofengineeringdesign. Key Words DieCasting Fully-hydraulicLockingDe- vice,MechanicalPerformance,FEM Analysis directlyaffectedthequalityofdiecastings.Through analyzingflow processofgasin vacuum exhausting pipe mainfactorsinfluencingvacuumrateincavity wereinvestigated andoptimizedprocessingparame- te rswerepresentedtorapidlyrealizehighvacuumrate drealizationofhighvacuumrateincavitybysettingexhaustingpipe withlargesectionandshortdistance andhighexhaustingspeedaswellassmallcavityvol- ume. Key Words VacuumDieCasting Cross-sec- tionalArea VacuumRate FaultDiagnosis Method Based RBFNNModelsSong Peng DepartmentofE-le ctricalEngineering LiaoningTechnicalUniversity 50~53Abstract newfaultdiagnosis methodto hydraulic systemfordiecasting machinebased RBFNNmodelswasputforward.TheARX modelaf- te rfuzzyprocessingnotonlyretaineditsverysensitive re sponsetofaultstatepattern butalsoachievedmoreac curate description severalFARX modelswereestablishedfortargetsys- te mfaulttoextracttheirfaultvectors.Secondly vectors wereservedastrainingsourcedataandthe BFnetworkclassifierwasestablished.Then atternscouldbeidentifiedaccordingtotheoutputoftheclassifier.A simulationverifiedtheaccuracyand availabilityofthemethod. Key Words DieCasting Machine FaultDiagnosis FuzzyAuto-regressivewithExtraInputModels RadialBasisFunctionNeuralNetwork NumericalSimulationofInvestmentCastingPureCop- perElectrodeGuoGuangsi ZhangWeiqiang ZhuLijuan SchoolofMaterials Science andEngineering ShenyangLigongUniversity 56~58AbstractShrinkageporosity wasoftenobservedincastingpurecopperelectrode.Aimingatthecharac- designofgatingsys-te mandcalculationofriserwereperformed andorigi-nati onofdefectsinpracticalpurecopperelectrodewas ana lyzed.Availabilityoftheoreticalanalysiswasveri- fied bynumericalsimulation.Throughcomparatively anal yzingdifferentgatingsystem designs optimizedgati ngsystem waspresentedbasedonvisualizingtem- perat urefieldandcloud mapofsolidfraction.Practi- calpr oduction wasconducted.Qualifiedpurecopper electrodewassuccessfullyproducedbasedontheopti- mizedparameters anditselectricconductivityreached56 MS eyWords GatingSystemDesign NumericalSimulationTheoreticalAnalysisofExhaustin MoldCavityinVacu- um Die Casting Gan Xuemei LongSiyuan 1,2 LiuWeizhao 1.SchoolofMaterialsScienceandEngineering ChongqingUniversity ProcessofBufferfly-ValveBodyanditsStructureOpti-mization Li Leyi LuMingxi LuXing WangYuncheng 2.WuhanState-ownedHoldingGroup Co. 59~62AbstractAccordingtothestructurecharacteristicsof valve-body parts structurepro- essingandcastingschemeoftheinvestmentcastingChina; ChongqingSinoST Company Chongqing 54~55Limited, AbstractDensityofthediecastingswasimprovedasa resultofeffectivelyreducinggasholeinthecastings throughvacuum diecasting.It wasa key pointfor rapidexhaustincavityinvacuum diecasting


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