了解故障的原因和对策Cause and Cauntermeasure

《了解故障的原因和对策Cause and Cauntermeasure》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、了解故障的原因和对策CauseandCauntermeasure注射成形故障包括下述各种类型：本节将故障分为【外观】故障和【成型性】故障两大类，并总结了各自的原因和对策。大部分成型故障都有多种原因，其中的多数情况必须在综合考虑成型品的实际形状、成型条件或设备状态后才能作出判断。为此，我们在本节中尽可能列举具体的例子来说明。请客户根据情况参阅与自己的现象最接近的那部分内容。如果本页能够对客户排除故障有所帮助的话，那就太好了。Thiscornerintroducecauseandcountermeasure

2、againstmanymoldingfailure.Theyareclassifiedintoaboutappearanceandmoldability.Moldingfailurehasusuallynoonecauses.Totaljudgmentisrequiredtotakecountermeasure.Sothen,thiscornershowsspecificexampleaspossible.Youchoiocecontentswhichyouthinkitismostnearyourtr

3、ouble.Wehopethispagehelpyou.BS（黑点）成型品表面出现的黑点现象。这是由于在机筒内已分解的树脂或被污染的杂物等混入到成型品中而造成的。BlackspecBSisamoldingdefectwhere(a)blackpoint(s)orline(s)appearsonthesurfaceofamoldedproduct.ItiscausedbydecompositionresinorContamination麻点成型品表面形成小凹坑的现象。注射速度较慢时易于发生这种现象。Pit

4、marksPitmarksaresmallpointsonthesurfaceofmoldingpieces.Itiscausedbylowinjectionspeed.熔合纹WeldlineWeldmeansajoiningpartofresinflowinginthecavityduringinjectionmolding.Weldlinemeansalineattheweld.成型品上有开孔时必然会产生熔合纹。熔合纹是指该熔合部分实际上看起来是一条线的现象。模具温度较低时容易出现这种现象。气体烧焦

5、Gasburn成型品充填末端烧焦的现象。排气不良时易于产生这种现象Gasburnisburningmarkonthesurfaceoftestpiece.Gasburnoccurswhenentrappedgasisrapidlycompressedandbecomeshightemperatureataresinfillingend.。玻纤析出Glassmarks成型品表面浮出玻璃纤维的现象。GlassmarksaregeneratedfromthesamecauseofHaze光泽不好Haze成型品

6、表面光泽消失的现象。保压或模具温度较低时易于产生这种现象Hazeindicatesinsufficientcontactofamoldedproducttoamold,inotherwords,transcriptionfailure.。冷料Coldslag成型机喷嘴前端的、稍稍冷却的树脂突出成型品表面的现象。看起来与雾面或喷射纹相同ColdSlagisaphenomenonthatsolidifiedresincomesintothecavity.ColdSlagappearonthesurfaceo

7、fmoldpiecelikeHazeorJetting.Otherwise,theircountermeasuresarenotsame.。喷射纹Jetting注射速度过快时树脂流动前端突出的现象。成型品表面会出现各种花纹Jettinglookslikeastrandpatternorlikehaze.Itiscausedbymuchhighinjectionspeedorsmallsizegate.。充填不足Shortshot成型品无法完全充填的现象Shortshotisincompleteresin

8、filling.银纹Silvermarks浇口附近呈现出细小流痕（树脂流动花纹）的现象。主要原因是带入了水分或气体。Silvermarkisaphenomenonthatgasorairappearsonthesurfaceofamoldedproduct.Itiscausedbydecomositgas,moisutureandentrainmentair.压花不均匀Poortranscriptionofemboss在使用压花模具时，由于