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1、河南工学院毕业设计41河南工学院毕业设计41河南工学院毕业设计HT300法兰盘砂型铸造工艺设计摘要本法兰为一小型铸件,铸件材质HT300,结构简单,无复杂的型腔和阻碍起模的凸起。铸件的外形尺寸为200mm×110mm×120mm,主要壁厚为15mm,壁厚均匀。法兰采用HT300是一种较高强度铸铁,基体为珠光体,强度、耐磨性、耐热性均较好,减振性也良好,铸造性能较好。从法兰的整体结构特点出发,进行铸造工艺设计分析,确定铸造方案,并进行铸造工艺参数和砂芯的设计,在此基础上再根据铸件的材质重量和浇注系统性能设计补缩系统。采用粘土
2、砂手工造型、制芯、金属摸样和半封闭加注系统,设计时应综合考虑各方面因素,浇注系统不是简单地金属液流动通道,用proe三维造型后,采用华铸CAE软件对设计方案进行浇注、凝固模拟计算。结果显示,浇注系统设计合理,但凝固时铸件上表面有明显的缩孔缩松,经仔细观察此缩孔在铸件刚开始凝固时都已经产生,分析原因是因为铸件为湿型,开始凝固时吸收较多的热量,使上表面先凝固下沉,产生凹坑阻碍金属液补缩,为了避免此缺陷的产生减少热量散失浇筑前铸件进行预热,改进工艺后再次运用华铸CAE模拟铸件无明显缺陷。由于铸件模数较小M=1.5cm,HT300
3、凝固时伴随着石墨的析出与膨胀,铸件以层状-糊状方式凝固,其共晶膨胀压力小,加之石墨片尖端伸向铁液的生长方式,使其有很好的“自补”能力,需要的补缩金属液较少,件工艺出品率为75%。关键词:法兰;砂型铸造;工艺设计;CAE。41河南工学院毕业设计Thegrayiron300flangesandcastingcastingprocessdesignAbstractTheutilitymodelhastheadvantagesofsmallsize,simplestructure,simplestructure,nocomplic
4、atedcavity,andtheprotrusionofthemould.Thedimensionofcastingis200mm*110mm*120mm,themainwallthicknessis15mm,thewallthicknessiseven.HT300isakindofhighstrengthcastiron,thematrixofpearlite,strength,wearresistance,heatresistancearegood,vibrationresistanceisgood,goodcast
5、ingperformance.Fromthepointofthewholestructureoftheflangedesignandanalysisofcastingprocess,determinethecastingscheme,designandcastingprocessparametersandsandcore,onthebasisofmaterialaccordingtotheweightandperformanceofgatingsystemdesignofcastingfeedingsystem.Thecl
6、aysandhandmolding,metalappearanceandsemiclosedfillingsystem,thedesignshouldconsidervariousfactors,pouringsystemisnotsimplytheliquidmetalflowchannel,usingproe3DmodelingsoftwareCAE,castingcasting,thedesignschemeofsolidificationsimulationbychina.Theresultsshowedthatt
7、hegatingsystemdesignisreasonable,butwhenthecastingsolidificationshrinkagesurfacehasobviousshrinkage,aftercarefulobservationofthisshrinkagehasproducedinthebeginningofcastingsolidification,analysisthereasonisbecausethecastingforwettype,moreabsorptionduringinitialsol
8、idificationheat,thesurfacesolidificationsubsidencehavepitsabarriermetalliquidfeeding,inordertoavoidthedefectsofreducingtheheatlossofcastingpreheatingbef