MoldFlow 流程和分析报告.ppt

moldflow流程和分析报告,tpm/jason.zhai2010.3.15,agenda,whyusemoldflow为什么要用模流？moldflowresultiscorrect模流的结果正确么？moldflowprocessimplementationinhi-p模流在赫比的应用流程。howtoreadmfareport如何阅读模流报告？sample实例分析q&a答疑,whyusemoldflow?,gatelocation浇口位置flowbalancing流动平衡coolantsetting冷却水路设置appearance产品外观warpage变形翘曲,moldflowresultiscorrect?,flowexcellentcoolinggoodappearancegoodwarpagejustforreference,allofthemneedprecisemoldingconditions.正确的结果需要准确的工艺条件rawmaterialproperty原料物性injectionconditions注射成型条件injectionmachineparameter注射机参数coolingchannelsetup冷却水路设置,moldflowprocessimplementationinhi-p,moldflowprocessimplementationinhi-p,partdesignstagegatelocationandnumber浇口位置，数量thicknessanalyst壁厚分析choosingmaterial原料选择flowpattern流动模式sinkmark缩痕weldline结合线位置airtraps.气泡,moldflowprocessimplementationinhi-p,molddesignstagecavitynumber模穴数量.cavitylayout模穴排布coolantchannellayout冷却水路排布cycletime成型周期warpage翘曲变形clampforceverify锁模力验证,moldflowprocessimplementationinhi-p,trailrunandmpstagereferencingmfareporttosetupprocessingcondition.以mfareport为参考，设置成型工艺。comparetrailrunandmoldflowresulttoverifymoldflow.对比试模结果，验证mf。summarizeexperienceandwritelessonlearn.总结经验。,howtoreadmoldflowresult?,themainresultofmoldflowbestgatelocation最佳浇口位置filltime/flowbalance充填时间和流动平衡temperatureatflowfront流动前沿温度bulktemperature体平均温度pressureatv/pswitchoverv/p切换压力（最大注射压力）clampforce锁模力timetofreeze冷凝时间shearrate剪切速率weldlines结合线airtraps气泡volumeshrinkage体积收缩率deflection变形,howtoreadmoldflowresult?,bestgatelocation最佳浇口位置,howtoreadmoldflowresult?,filltime/flowbalance充填时间和流动平衡,inabalancedfilltimeresult平衡的充填结果:allflowpathsfinishatthesametime.各方向同时完成填充thecontoursareevenlyspaced.等高线分布均匀thingstolookfor需要注意问题:shortshot短射hesitation滞留overpacking过保压weldline结合线,howtoreadmoldflowresult?,filltime/flowbalance充填时间和流动平衡,howtoreadmoldflowresult?,temperatureatflowfront流动前沿温度bulktemperature体平均温度,thingstolookfor需要注意问题:hotspots集热点coldspots集冷点isthematerialshearheatingorcoolingexcessively?是否因剪切热或过分冷却导致？,howtoreadmoldflowresult?,temperatureatflowfront流动前沿温度bulktemperature体平均温度,howtoreadmoldflowresult?,pressureatv/pswitchoverv/p切换压力（最大注射压力）,usenomorethanabout75%ofthepressurecapacityforadesignguidefortheentiremold,and50%forjustthepart.ifthepressureisover80mpaatpartingsurface,burrwilloccurred.注射压力一般不超过注射机最大压力的75%，产品上的最大压力不超过50%。分型面压力超过80mpa时，会产生飞边。,howtoreadmoldflowresult?,clampforce锁模力,clampforceshouldbelessthanapproximately80%ofthemachinelimit.锁模力应低于机器最大锁模力的80%。,howtoreadmoldflowresult?,timetofreeze冷凝时间,areasofthepartthattakelongertofreezemayindicatethickerareasofthepartorareasofshearheatduringfillingand/orpacking.冷却时间较长区域意味着该位置壁厚较大或充填过程中有剪切热产生。thingstolookfor需要注意问题:uniformpolymerfreezedistribution.产品冷凝均匀checkwhetherthegatefreezesbeforethepart.检查浇口是否先于产品冷却,howtoreadmoldflowresult?,shearrate剪切速率,exceedingthemaximumvaluerecommendedforthematerialvaluewouldlikelyleadtopolymerdegradation.超出最大值会导致材料降解。thingstolookfor需要注意问题:highshearratestendtooccurinthefeedsystem浇口附近剪切速率大toreducetheshearrate,increasethecrosssectionordecreasetheflowrate.增加截面积或降低流率可降低剪切速率,howtoreadmoldflowresult?,weldlines结合线,itcancausestructuralproblemsandmakethepartvisuallyunacceptable.ifthetemperatureofthemeltattheweldlineasitformsisnomorethan20cbelowtheinjectiontemperature,itwillbeok.结合线会导致结构脆弱和外观不良，如果结合线处的温度不低于成型温度20c，就没有问题。,howtoreadmoldflowresult?,airtraps气泡,thingstolookfor需要注意问题:burnmarks烧焦shortshot缺料othersurfaceblemishes其他外观缺陷,howtoreadmoldflowresult?,volumeshrinkage体积收缩率,thingstolookfor需要注意问题:ifthevolumetricshrinkageisover5%andvibratedobviously,sinkmarkwilloccurred.如果体积收缩率超过5%且变化明显时，缩痕就会出现。negativevolumetricvalues