mold_flow_checklist_解释说明

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1、Enterfill/packswitchoverpercentageforeachscenario填充/保压转换时填充百分率Thisplotshowsthepressuredistributionat97%switchoverbyvolume.Pressuretofill–8,675psi.97%JES3.2—AnalyzeMoldFlowandSelectOptimalScenario通过模流分析选择最佳方案Entermaximumpressureatendoffillforeachscenario第一阶段注射压力T

2、hisplotshowsthepressuredistributionat97%switchoverbyvolume.Pressuretofill–8,675psi.8675.6Reviewpressuredistributionandbalanceatendoffillforeachscenario压力分布及填充平衡AvoidGoodPartispoorlybalancedandhaslargedistributionofpressure产品填充不平衡且压力差较大Partisverywellbalancedandha

3、ssmalldistributionofpressure产品填充平衡且压力分布均匀Consequences:Unevenpressuredistributioncanresultinlessconsistentmaterialshrink,higherresidualstresses,andareasofoverpackorunderpackconditions.压力分布不均会导致材料收缩不一致，残余应力高并且有些地方可能出现断层情况。Enterflowfronttemperaturevariationatendoff

4、illforeachscenario前端温差551.5-548.9=2.6Enterbulkshearrateingateforeachscenario浇口处剪切率~60,000流体的流动速相对圆流道半径的变化速率—剪切速率(shearrate)Entershearstressinthepartforeachscenario填充末端（95%时）壁上剪切力~25Reviewweldlinesandincludetemperatureatflowfrontforeachscenario熔界线位置和长度包括熔接线位置的前端温

5、度GUIDELINES:Minimizethelengthofallknitlines.Wherepossible,horizontallinesarepreferredtoverticalknitlines.Also,reviewtheflowfronttemperatureattheweldlines.使熔接线长度最小化。可能的话，水平的熔接线比垂直的好。同时要审核熔接线处的前端温度。CONSEQUENCES:Lowertemperaturesmayindicatethatitwillbedifficulttoco

6、ntroltheappearanceoftheweldline.Thestrengthofthecoolerweldlinesmayalsobelessthanhighertemperatureweldlines.温度低会使得熔接线外观难于控制。温度低的熔接线处强度比温度高的差。Reviewairtrapsforeachscenario气泡AvoidVentGUIDELINES:Forceallairtrapstoedgesofpart.Airtrapslocatedattheedgesofthepartshouldb

7、evented.Airtrapsthatareonthesurfaceofthepartshouldbeavoided.将所有气泡赶到产品边缘。位于产品边缘的气泡可以排气。避免产品表面气泡。CONSEQUENCES:Airtrapsthatarenotproperlyventedcancausegasburnsinthoselocations.不能排气的气泡可能导致该区域气体灼伤。Enterpackandholdpressureforeachscenario第二阶段压力6,400(80%of8,000)6,4008,0

8、00Reviewinjectionpressureatnozzleversustimeforeachscenario喷嘴处压力/时间图GUIDELINES:Optimaldesignshavenearlyequalspikesatfillingandswitchoverpoints.最好是尖点位于转换点。CONSEQUENCES: