MoldFlow流程和分析报告.ppt

moldflow 流程和分析报告,tpm/jason.zhai 2010.3.15,agenda,why use moldflow 为什么要用模流？ moldflow result is correct 模流的结果正确么？ moldflow process implementation in hi-p 模流在赫比的应用流程。 how to read mfa report 如何阅读模流报告？ sample 实例分析 q&a 答疑,why use moldflow?,gate location浇口位置 flow balancing流动平衡 coolant setting冷却水路设置 appearance 产品外观 warpage 变形翘曲 ,moldflow result is correct?,flow excellent cooling good appearance good warpage just for reference,all of them need precise molding conditions. 正确的结果需要准确的工艺条件 raw material property原料物性 injection conditions注射成型条件 injection machine parameter注射机参数 cooling channel setup冷却水路设置,moldflow process implementation in hi-p,moldflow process implementation in hi-p,part design stage gate location and number 浇口位置，数量 thickness analyst 壁厚分析 choosing material 原料选择 flow pattern 流动模式 sink mark 缩痕 weld line 结合线位置 air traps.气泡,moldflow process implementation in hi-p,mold design stage cavity number 模穴数量. cavity layout 模穴排布 coolant channel layout 冷却水路排布 cycle time 成型周期 warpage 翘曲变形 clamp force verify 锁模力验证,moldflow process implementation in hi-p,trail run and mp stage referencing mfa report to setup processing condition. 以mfa report为参考，设置成型工艺。 compare trail run and moldflow result to verify moldflow. 对比试模结果，验证mf。 summarize experience and write lesson learn. 总结经验。,how to read moldflow result?,the main result of moldflow best gate location 最佳浇口位置 fill time/flow balance 充填时间和流动平衡 temperature at flow front流动前沿温度 bulk temperature体平均温度 pressure at v/p switchover v/p切换压力（最大注射压力） clamp force 锁模力 time to freeze冷凝时间 shear rate剪切速率 weld lines结合线 air traps气泡 volume shrinkage体积收缩率 deflection变形,how to read moldflow result?,best gate location 最佳浇口位置,how to read moldflow result?,fill time/flow balance 充填时间和流动平衡,in a balanced fill time result平衡的充填结果: all flow paths finish at the same time. 各方向同时完成填充 the contours are evenly spaced. 等高线分布均匀 things to look for需要注意问题 : short shot 短射 hesitation 滞留 over packing 过保压 weld line结合线,how to read moldflow result?,fill time/flow balance 充填时间和流动平衡,how to read moldflow result?,temperature at flow front流动前沿温度 bulk temperature体平均温度,things to look for需要注意问题 : hot spots集热点 cold spots集冷点 is the material shear heating or cooling excessively? 是否因剪切热或过分冷却导致？,how to read moldflow result?,temperature at flow front流动前沿温度 bulk temperature体平均温度,how to read moldflow result?,pressure at v/p switchover v/p切换压力（最大注射压力）,use no more than about 75% of the pressure capacity for a design guide for the entire mold, and 50% for just the part. if the pressure is over 80mpa at parting surface, burr will occurred. 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。,how to read moldflow result?,clamp force 锁模力,clamp force should be less than approximately 80% of the machine limit. 锁模力应低于机器最大锁模力的80%。,how to read moldflow result?,time to freeze冷凝时间,areas of the part that take longer to freeze may indicate thicker areas of the part or areas of shear heat during filling and/or packing. 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。 things to look for需要注意问题 : uniform polymer freeze distribution. 产品冷凝均匀 check whether the gate freezes before the part. 检查浇口是否先于产品冷却,how to read moldflow result?,shear rate剪切速率,exceeding the maximum value recommended for the material value would likely lead to polymer degradation. 超出最大值会导致材料降解。 things to look for需要注意问题 : high shear rates tend to occur in the feed system 浇口附近剪切速率大 to reduce the shear rate, increase the crosssection or decrease the flow rate. 增加截面积或降低流率可降低剪切速率,how to read moldflow result?,weld lines结合线,it can cause structural problems and make the part visually unacceptable. if the temperature of the melt at the weld line as it forms is no more than 20c below the injection temperature, it will be ok. 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。,how to read moldflow result?,air traps气泡,things to look for需要注意问题 : burn marks烧焦 short shot缺料 other surface blemishes其他外观缺陷,how to read moldflow result?,volume shrinkage体积收缩率,things to look for需要注意问题 : if the volumetric shrinkage is over 5% and vibrated obviously, sink mark will occurred. 如果体积收缩率超过5%且变化明显时，缩痕就会出现。 negative volumetric v