塑胶产品注塑成型常见问题及改善对策（common problems of plastic injection molding and improvement measures）

《塑胶产品注塑成型常见问题及改善对策（common problems of plastic injection molding and improvement measures）》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、塑胶产品注塑成型常见问题及改善对策（Commonproblemsofplasticinjectionmoldingandimprovementmeasures）Asastructuraldesignengineer,whentrytodieandmoldinjectionmoldingbadlikenow,oftenseeproductswhileinjectionisbadbytuningmachinepersonneltoimprove,butasanexperienceddesignengineers,stillhavetounderstan

2、dsomeofthecommoninjectionmoldingbadproblemsandimprovementmeasures!Themoldingdefectsandabnormalphenomenaarefinallyreflectedinthequalityoftheinjectionmoldingproducts.Thedefectsofinjectionproductscanbedividedintothefollowingpoints:(1)insufficientinjectionofproduct;(2)productoverf

3、low;(3)productdentsandbubbles;(4)productshavethefollowingmarks;(5)theproductiscrisp;(6)plasticdiscoloration;(7)productshavesilver,speckleandflowmarks;(8)cloudyatthegateoftheproduct;(9)productwarpandcontraction;(10)inaccuratesizeofproducts;(11)productpastemould;(12)materialpast

4、ingchannel;(13)thenozzledrizzles.Thereasonsandwaystoovercomeitaredescribedbelow.Howdoesthepersonovercometheproductinjection?Theinsufficiencyoftheproductisusuallyduetothesolidificationofthematerialbeforeitisfullofthecavity,andofcoursetherearemanyotherreasons.Reasonsfortheequipm

5、ent:(1)hopperinterrupts;(2)theneckpartoralloftheclogging;Notenoughmaterial;Improperoperationoffeedingcontrolsystem;Theplasticizedcapacityofthemachineistoosmall;Theinjectioncyclecausedbythedeviceisabnormal.Thereasonsfortheinjectionmoldingconditions:Theinjectionpressurewastoolow

6、;Theinjectionpressurelossistoogreatduringtheinjectioncycle;Theinjectiontimeistooshort;Thetotalpressuretimeistooshort;Therateofinjectionistooslow;Thematerialflowinthecavityisinterrupted.Therateofchargevaries;Theinjectioncyclecausedbytheoperationconditionisabnormal.Thereasonofth

7、etemperature:Raisethetemperatureofthecylinder;Raisenozzletemperature;Inspectionofmillivoltmeter,thermocouple,electricresistanceheatingcoil(orfar-infraredheatingdevice)andheatingsystem;Raisemoldtemperature;Checkdietemperaturecontroldevice.ThereasonwhyThepassageistoosmall;Thegat

8、eistoosmall;Thenozzleholeistoosmall;Thepositionofthegateisnot